TY  - JOUR
AU  - Erić, Aleksandar M.
AU  - Nemoda, Stevan
AU  - Komatina, Mirko
AU  - Repić, Branislav
AU  - Dakić, Dragoljub
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3074
AB  - This paper presents numerical and experimental investigations of complex and interrelated physical and chemical phenomena that occur during combustion of baled soybean residue in the furnace with the cigarette type of combustion. The result of comprehensive research is reactive flow model of biomass combustion inside furnace. Model is described by set of PDE which define momentum, heat and mass transfer processes in porous and fluid system. The main aim of developed CFD model is numerical simulation of combustion process inside the cigarette furnace. It is also used to provide deeper insight in complex processes occurring during biomass combustion. Verification of proposed numerical model was performed through comprehensive experimental tests on the experimental-industrial plant of 1.5 MW boiler for heating the greenhouses in the Agricultural Corporation in Belgrade. The tests included measurement of flow rate and air and flue gas temperature input and output values on the furnace that are taken as the boundary conditions of the developed model. Comparison of the experimental results shows satisfactory agreement with numerical results (the maximum relative deviation of calculation and measurement temperatures are 10-45%), therefore the developed mathematical model could be used to analyse the effects of structural and parametric (fuel composition, power rate, air excess etc.) changes of the facility, from the standpoint of energy efficiency and ecology.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Modeling of transport processes in the cigarette principle combustion furnace
EP  - S1510
SP  - S1499
VL  - 23
DO  - 10.2298/TSCI180226318E
ER  - 

@article{
author = "Erić, Aleksandar M. and Nemoda, Stevan and Komatina, Mirko and Repić, Branislav and Dakić, Dragoljub",
year = "2019",
abstract = "This paper presents numerical and experimental investigations of complex and interrelated physical and chemical phenomena that occur during combustion of baled soybean residue in the furnace with the cigarette type of combustion. The result of comprehensive research is reactive flow model of biomass combustion inside furnace. Model is described by set of PDE which define momentum, heat and mass transfer processes in porous and fluid system. The main aim of developed CFD model is numerical simulation of combustion process inside the cigarette furnace. It is also used to provide deeper insight in complex processes occurring during biomass combustion. Verification of proposed numerical model was performed through comprehensive experimental tests on the experimental-industrial plant of 1.5 MW boiler for heating the greenhouses in the Agricultural Corporation in Belgrade. The tests included measurement of flow rate and air and flue gas temperature input and output values on the furnace that are taken as the boundary conditions of the developed model. Comparison of the experimental results shows satisfactory agreement with numerical results (the maximum relative deviation of calculation and measurement temperatures are 10-45%), therefore the developed mathematical model could be used to analyse the effects of structural and parametric (fuel composition, power rate, air excess etc.) changes of the facility, from the standpoint of energy efficiency and ecology.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Modeling of transport processes in the cigarette principle combustion furnace",
pages = "S1510-S1499",
volume = "23",
doi = "10.2298/TSCI180226318E"
}

Erić, A. M., Nemoda, S., Komatina, M., Repić, B.,& Dakić, D.. (2019). Modeling of transport processes in the cigarette principle combustion furnace. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 23, S1499-S1510.
https://doi.org/10.2298/TSCI180226318E

Erić AM, Nemoda S, Komatina M, Repić B, Dakić D. Modeling of transport processes in the cigarette principle combustion furnace. in Thermal Science. 2019;23:S1499-S1510.
doi:10.2298/TSCI180226318E .

Erić, Aleksandar M., Nemoda, Stevan, Komatina, Mirko, Repić, Branislav, Dakić, Dragoljub, "Modeling of transport processes in the cigarette principle combustion furnace" in Thermal Science, 23 (2019):S1499-S1510,
https://doi.org/10.2298/TSCI180226318E . .

TY  - JOUR
AU  - Erić, Aleksandar
AU  - Nemoda, Stevan
AU  - Komatina, Mirko
AU  - Dakić, Dragoljub
AU  - Repić, Branislav
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3016
AB  - The paper presents results of experimental investigation performed in order to examine kinetics of loose biomass combustion in vertical tube reactor. The investigation conducted included continuous measurement of the fuel mass loss rate, with two biomass combustion models (piston and batch model) proposed, each relying on appropriate theoretical postulates. Results obtained indicated that piston combustion model had shown better agreement between theoretical and experimental data and was therefore used to further analyse effects of excess-air on the combustion kinetics, as well as associated effects of flue gas recirculation. Recirculation of cold flue gases is used to lower peak temperature inside the furnace, as well as to reduce a zone where ash melting problems may potentially occur. During the investigation performed, effects of flue gas recirculation on the combustion process were simulated by simultaneously injecting nitrogen and air flows into the furnace. This was deemed appropriate to simulate real-life conditions prevailing in the furnace with gas recirculation. Experiments were conducted on specially designed and constructed apparatus that enabled kinetic parameters to be determined for the combustion of different types of biomass. Results obtained have indicated that quantity of air affects kinetics of biomass combustion and that increased recirculation leads to reduced biomass reaction rate. The same conclusion was reached based on the results of experiments conducted with two different types of agro-biomass, namely wheat straw and corn stalks, which are most commonly used for energy generation. Results achieved are deemed particularly important when it comes to design of new plants that utilize cigarette type combustion system, but also for development of numerical models used to simulate combustion of biomass bales, with special emphasis placed on the impact of recirculation gases on the combustion kinetics.
PB  - Elsevier Sci Ltd, Oxford
T2  - Journal of The Energy Institute
T1  - Experimental investigation on the kinetics of biomass combustion in vertical tube reactor
EP  - 1090
IS  - 4
SP  - 1077
VL  - 92
DO  - 10.1016/j.joei.2018.06.009
ER  - 

@article{
author = "Erić, Aleksandar and Nemoda, Stevan and Komatina, Mirko and Dakić, Dragoljub and Repić, Branislav",
year = "2019",
abstract = "The paper presents results of experimental investigation performed in order to examine kinetics of loose biomass combustion in vertical tube reactor. The investigation conducted included continuous measurement of the fuel mass loss rate, with two biomass combustion models (piston and batch model) proposed, each relying on appropriate theoretical postulates. Results obtained indicated that piston combustion model had shown better agreement between theoretical and experimental data and was therefore used to further analyse effects of excess-air on the combustion kinetics, as well as associated effects of flue gas recirculation. Recirculation of cold flue gases is used to lower peak temperature inside the furnace, as well as to reduce a zone where ash melting problems may potentially occur. During the investigation performed, effects of flue gas recirculation on the combustion process were simulated by simultaneously injecting nitrogen and air flows into the furnace. This was deemed appropriate to simulate real-life conditions prevailing in the furnace with gas recirculation. Experiments were conducted on specially designed and constructed apparatus that enabled kinetic parameters to be determined for the combustion of different types of biomass. Results obtained have indicated that quantity of air affects kinetics of biomass combustion and that increased recirculation leads to reduced biomass reaction rate. The same conclusion was reached based on the results of experiments conducted with two different types of agro-biomass, namely wheat straw and corn stalks, which are most commonly used for energy generation. Results achieved are deemed particularly important when it comes to design of new plants that utilize cigarette type combustion system, but also for development of numerical models used to simulate combustion of biomass bales, with special emphasis placed on the impact of recirculation gases on the combustion kinetics.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Journal of The Energy Institute",
title = "Experimental investigation on the kinetics of biomass combustion in vertical tube reactor",
pages = "1090-1077",
number = "4",
volume = "92",
doi = "10.1016/j.joei.2018.06.009"
}

Erić, A., Nemoda, S., Komatina, M., Dakić, D.,& Repić, B.. (2019). Experimental investigation on the kinetics of biomass combustion in vertical tube reactor. in Journal of The Energy Institute
Elsevier Sci Ltd, Oxford., 92(4), 1077-1090.
https://doi.org/10.1016/j.joei.2018.06.009

Erić A, Nemoda S, Komatina M, Dakić D, Repić B. Experimental investigation on the kinetics of biomass combustion in vertical tube reactor. in Journal of The Energy Institute. 2019;92(4):1077-1090.
doi:10.1016/j.joei.2018.06.009 .

Erić, Aleksandar, Nemoda, Stevan, Komatina, Mirko, Dakić, Dragoljub, Repić, Branislav, "Experimental investigation on the kinetics of biomass combustion in vertical tube reactor" in Journal of The Energy Institute, 92, no. 4 (2019):1077-1090,
https://doi.org/10.1016/j.joei.2018.06.009 . .

TY  - JOUR
AU  - Erić, Aleksandar
AU  - Nemoda, Stevan
AU  - Komatina, Mirko
AU  - Dakić, Dragoljub
AU  - Repić, Branislav
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2508
AB  - U cilju dobijanja pouzdanih rezultata o globalnoj kinetici procesa sagorevanja biomase u formi bala urađena je analiza eksperimentalnog određivanja kinetike sagorevanja rastresite biomase u vertikalnom cevnom reaktoru, sa praćenjem promene mase uzorka. Pretpostavljena su dva moguća načina sagorevanja balirane biomase (klipni i šaržni), za koje su postavljene odgovarajuće teorijske osnove. Analizom i poređenjem sa eksperimentalnim rezultatima izabran je klipni model sagorevanja, koji je pokazao najbolje slaganje sa eksperimentalnim rezultatima. Ovaj model sagorevanja korišćen je u daljim analizama uticaja viška vazduha na kinetiku sagorevanja, kao i uticaja recirkulacije na istu veličinu. Eksperimenti su obavljeni na posebno konstruisanoj i izrađenoj aparaturi, a u cilju dobijanja projektnih parametara kinetike sagorevanja različitih vrsta biomase. Rezultati pokazuju da količina vazduha utiče na globalnu kinetiku procesa sagorevanja. Ova zavisnost je potvrđena na dve vrste biomase pšeničnoj slami i kukuruzovini, koje predstavljaju najčešče korišćenu poljoprivrednu biomasu u energetske svrhe. Dobijeni rezultati su značajni prilikom izrade novih postrojenja koja rade po principu cigaretnog sagorevanja, kao i u procesu izrade matematičkih modela za numeričku simulaciju cigaretnog sagorevanja, sa posebnim osvrtom na uticaj recirkulacije na globalnu kinetiku.
AB  - The paper presents results of experimental investigation performed in order to examine kinetics of loose biomass combustion in vertical tube reactor. The investigation conducted included continuous measurement of the fuel mass loss rate, with two biomass combustion models (piston and batch model) proposed, each relying on appropriate theoretical postulates. Results obtained indicated that piston combustion model had shown better agreement between theoretical and experimental data and was therefore used to further analyse effects of excessair on the combustion kinetics. Experiments were conducted on specially designed and constructed apparatus that enabled kinetic parameters to be determined for the combustion of different types of biomass. Results obtained have indicated that quantity of air affects kinetics of biomass combustion. Experiments were conducted with two different types of agro-biomass, namely wheat straw and corn stalks, which are most commonly used for energy generation. Results achieved are deemed particularly important when it comes to design of new plants that utilize 'cigar' firing combustion system, but also for development of numerical models used to simulate combustion of biomass bales.
PB  - Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad
T2  - Savremena poljoprivredna tehnika
T1  - Analiza i izbor metodologije za određivanje kinetike sagorevanja poljoprivredne biomase
T1  - Analysis and selection of methodology for determination of the agricultural biomas combustion kinetics
EP  - 140
IS  - 3
SP  - 131
VL  - 43
DO  - 10.5937/SavPoljTeh1703131E
ER  - 

@article{
author = "Erić, Aleksandar and Nemoda, Stevan and Komatina, Mirko and Dakić, Dragoljub and Repić, Branislav",
year = "2017",
abstract = "U cilju dobijanja pouzdanih rezultata o globalnoj kinetici procesa sagorevanja biomase u formi bala urađena je analiza eksperimentalnog određivanja kinetike sagorevanja rastresite biomase u vertikalnom cevnom reaktoru, sa praćenjem promene mase uzorka. Pretpostavljena su dva moguća načina sagorevanja balirane biomase (klipni i šaržni), za koje su postavljene odgovarajuće teorijske osnove. Analizom i poređenjem sa eksperimentalnim rezultatima izabran je klipni model sagorevanja, koji je pokazao najbolje slaganje sa eksperimentalnim rezultatima. Ovaj model sagorevanja korišćen je u daljim analizama uticaja viška vazduha na kinetiku sagorevanja, kao i uticaja recirkulacije na istu veličinu. Eksperimenti su obavljeni na posebno konstruisanoj i izrađenoj aparaturi, a u cilju dobijanja projektnih parametara kinetike sagorevanja različitih vrsta biomase. Rezultati pokazuju da količina vazduha utiče na globalnu kinetiku procesa sagorevanja. Ova zavisnost je potvrđena na dve vrste biomase pšeničnoj slami i kukuruzovini, koje predstavljaju najčešče korišćenu poljoprivrednu biomasu u energetske svrhe. Dobijeni rezultati su značajni prilikom izrade novih postrojenja koja rade po principu cigaretnog sagorevanja, kao i u procesu izrade matematičkih modela za numeričku simulaciju cigaretnog sagorevanja, sa posebnim osvrtom na uticaj recirkulacije na globalnu kinetiku., The paper presents results of experimental investigation performed in order to examine kinetics of loose biomass combustion in vertical tube reactor. The investigation conducted included continuous measurement of the fuel mass loss rate, with two biomass combustion models (piston and batch model) proposed, each relying on appropriate theoretical postulates. Results obtained indicated that piston combustion model had shown better agreement between theoretical and experimental data and was therefore used to further analyse effects of excessair on the combustion kinetics. Experiments were conducted on specially designed and constructed apparatus that enabled kinetic parameters to be determined for the combustion of different types of biomass. Results obtained have indicated that quantity of air affects kinetics of biomass combustion. Experiments were conducted with two different types of agro-biomass, namely wheat straw and corn stalks, which are most commonly used for energy generation. Results achieved are deemed particularly important when it comes to design of new plants that utilize 'cigar' firing combustion system, but also for development of numerical models used to simulate combustion of biomass bales.",
publisher = "Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad",
journal = "Savremena poljoprivredna tehnika",
title = "Analiza i izbor metodologije za određivanje kinetike sagorevanja poljoprivredne biomase, Analysis and selection of methodology for determination of the agricultural biomas combustion kinetics",
pages = "140-131",
number = "3",
volume = "43",
doi = "10.5937/SavPoljTeh1703131E"
}

Erić, A., Nemoda, S., Komatina, M., Dakić, D.,& Repić, B.. (2017). Analiza i izbor metodologije za određivanje kinetike sagorevanja poljoprivredne biomase. in Savremena poljoprivredna tehnika
Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad., 43(3), 131-140.
https://doi.org/10.5937/SavPoljTeh1703131E

Erić A, Nemoda S, Komatina M, Dakić D, Repić B. Analiza i izbor metodologije za određivanje kinetike sagorevanja poljoprivredne biomase. in Savremena poljoprivredna tehnika. 2017;43(3):131-140.
doi:10.5937/SavPoljTeh1703131E .

Erić, Aleksandar, Nemoda, Stevan, Komatina, Mirko, Dakić, Dragoljub, Repić, Branislav, "Analiza i izbor metodologije za određivanje kinetike sagorevanja poljoprivredne biomase" in Savremena poljoprivredna tehnika, 43, no. 3 (2017):131-140,
https://doi.org/10.5937/SavPoljTeh1703131E . .

TY  - JOUR
AU  - Mladenović, Milica R.
AU  - Dakić, Dragoljub
AU  - Nemoda, Stevan
AU  - Paprika, Milijana J.
AU  - Komatina, Mirko
AU  - Repić, Branislav
AU  - Erić, Aleksandar M.
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2410
AB  - Harmonization of environmental protection and the growing energy needs of modern society promote the biomass application as a replacement for fossil fuels and a viable option to mitigate the greenhouse gas emissions. For domestic conditions this is particularly important as more than 60% of renewables belongs to biomass. Beside numerous benefits of using biomass for energy purposes, there are certain drawbacks, one of which is a possible high emission of NOx during the combustion of these fuels. The paper presents the results of the experiments with multiple biomass types (soybean straw, cornstalk, grain biomass, sunflower oil, glycerin and paper sludge), using different combustion technologies (fluidized bed and cigarette combustion), with emphasis on the emission of NOx in the exhaust gas. A presentation of the experimental installations is given, as well as an evaluation of the effects of the fuel composition, combustion regimes and technology on the NOx emissions. As the biomass combustion took place at temperatures low enough that thermal and prompt NOx can be neglected, the conclusion is the emissions of nitrogen oxides primarily depend on the biomass composition - it is increasing with the increase of the nitrogen content, and decreases with the increase of the char content which provides catalytic surface for NOx reduction by CO.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska Industrija
T1  - The combustion of biomass - The impact of its types and combustion technologies on the emission of nitrogen oxide
EP  - 298
IS  - 3
SP  - 287
VL  - 70
DO  - 10.2298/HEMIND150409033M
ER  - 

@article{
author = "Mladenović, Milica R. and Dakić, Dragoljub and Nemoda, Stevan and Paprika, Milijana J. and Komatina, Mirko and Repić, Branislav and Erić, Aleksandar M.",
year = "2016",
abstract = "Harmonization of environmental protection and the growing energy needs of modern society promote the biomass application as a replacement for fossil fuels and a viable option to mitigate the greenhouse gas emissions. For domestic conditions this is particularly important as more than 60% of renewables belongs to biomass. Beside numerous benefits of using biomass for energy purposes, there are certain drawbacks, one of which is a possible high emission of NOx during the combustion of these fuels. The paper presents the results of the experiments with multiple biomass types (soybean straw, cornstalk, grain biomass, sunflower oil, glycerin and paper sludge), using different combustion technologies (fluidized bed and cigarette combustion), with emphasis on the emission of NOx in the exhaust gas. A presentation of the experimental installations is given, as well as an evaluation of the effects of the fuel composition, combustion regimes and technology on the NOx emissions. As the biomass combustion took place at temperatures low enough that thermal and prompt NOx can be neglected, the conclusion is the emissions of nitrogen oxides primarily depend on the biomass composition - it is increasing with the increase of the nitrogen content, and decreases with the increase of the char content which provides catalytic surface for NOx reduction by CO.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska Industrija",
title = "The combustion of biomass - The impact of its types and combustion technologies on the emission of nitrogen oxide",
pages = "298-287",
number = "3",
volume = "70",
doi = "10.2298/HEMIND150409033M"
}

Mladenović, M. R., Dakić, D., Nemoda, S., Paprika, M. J., Komatina, M., Repić, B.,& Erić, A. M.. (2016). The combustion of biomass - The impact of its types and combustion technologies on the emission of nitrogen oxide. in Hemijska Industrija
Savez hemijskih inženjera, Beograd., 70(3), 287-298.
https://doi.org/10.2298/HEMIND150409033M

Mladenović MR, Dakić D, Nemoda S, Paprika MJ, Komatina M, Repić B, Erić AM. The combustion of biomass - The impact of its types and combustion technologies on the emission of nitrogen oxide. in Hemijska Industrija. 2016;70(3):287-298.
doi:10.2298/HEMIND150409033M .

Mladenović, Milica R., Dakić, Dragoljub, Nemoda, Stevan, Paprika, Milijana J., Komatina, Mirko, Repić, Branislav, Erić, Aleksandar M., "The combustion of biomass - The impact of its types and combustion technologies on the emission of nitrogen oxide" in Hemijska Industrija, 70, no. 3 (2016):287-298,
https://doi.org/10.2298/HEMIND150409033M . .

TY  - JOUR
AU  - Erić, Aleksandar
AU  - Dakić, Dragoljub
AU  - Nemoda, Stevan
AU  - Komatina, Mirko
AU  - Repić, Branislav
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2273
AB  - U radu su prikazani rezultati eksperimentalnog određivanja termofizičkih karakteristika balirane biomase čije poznavanje je neophodno za procese modeliranja transportnih fenomena u materijalu sa osobinama poroznog sloja. U cilju određivanja termofizičkih karakteristika balirane biomase osmišljena je eksperimentalna metoda i konstruisana odgovarajuća eksperimentalna aparatura. Ispitivan je uticaj veličine poroznosti sloja na vrednost stagnantne toplotne provodljivosti. Na osnovu sprovedenih merenja, kao i analize eksperimentalnih rezultata, određena je funkcionalna zavisnost stagnantne toplotne provodljivosti od poroznosti u opsegu od 0,50-0,85. Dobijeni rezultati pokazuju da smanjenjem poroznosti sloja do vrednosti od 0,65 dolazi do smanjenja vrednosti toplotne provodljivosti, a daljim smanjenjem veličine poroznosti ispod 0,65 dolazi do porasta vrednosti toplotne provodljivosti. Dobijeni rezultati korišćeni su u procesu modeliranja transportnih fenomena sagorevanja u poroznom sloju.
AB  - The paper presents experimental data obtained in the course of investigation focused on analysis of thermo-physical properties of baled biomass which value are necessary for modeling of transport phenomena in materials with porous bed. Experiments were conducted using a custom designed and constructed experimental setup and implementing original experimental procedure. Results obtained enabled stagnant thermal conductivity of biomass to be determined for different biomass porosity values. Analysis of experimental data enabled functional dependence of stagnant thermal conductivity on porosity to be determined, with porosity varied in a range 0.50-0.85. Results obtained indicate that reduced bed porosity, down to the value of 0.65, causes stagnant thermal conductivity of the bed to be reduced. Further porosity reduction, below the value of 0.65, results in increased stagnant thermal conductivity of the bed. In addition, data to be acquired shall be helpful in modeling the transport phenomena associated with combustion in porous beds.
PB  - Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad
T2  - Savremena poljoprivredna tehnika
T1  - Analiza uticaja vrste goriva na termofizičke karakteristike balirane biomase
T1  - Effects of types of fuels on thermo-physical properties of baled biomass
EP  - 206
IS  - 4
SP  - 197
VL  - 42
DO  - 10.5937/SavPoljTeh1604197E
ER  - 

@article{
author = "Erić, Aleksandar and Dakić, Dragoljub and Nemoda, Stevan and Komatina, Mirko and Repić, Branislav",
year = "2016",
abstract = "U radu su prikazani rezultati eksperimentalnog određivanja termofizičkih karakteristika balirane biomase čije poznavanje je neophodno za procese modeliranja transportnih fenomena u materijalu sa osobinama poroznog sloja. U cilju određivanja termofizičkih karakteristika balirane biomase osmišljena je eksperimentalna metoda i konstruisana odgovarajuća eksperimentalna aparatura. Ispitivan je uticaj veličine poroznosti sloja na vrednost stagnantne toplotne provodljivosti. Na osnovu sprovedenih merenja, kao i analize eksperimentalnih rezultata, određena je funkcionalna zavisnost stagnantne toplotne provodljivosti od poroznosti u opsegu od 0,50-0,85. Dobijeni rezultati pokazuju da smanjenjem poroznosti sloja do vrednosti od 0,65 dolazi do smanjenja vrednosti toplotne provodljivosti, a daljim smanjenjem veličine poroznosti ispod 0,65 dolazi do porasta vrednosti toplotne provodljivosti. Dobijeni rezultati korišćeni su u procesu modeliranja transportnih fenomena sagorevanja u poroznom sloju., The paper presents experimental data obtained in the course of investigation focused on analysis of thermo-physical properties of baled biomass which value are necessary for modeling of transport phenomena in materials with porous bed. Experiments were conducted using a custom designed and constructed experimental setup and implementing original experimental procedure. Results obtained enabled stagnant thermal conductivity of biomass to be determined for different biomass porosity values. Analysis of experimental data enabled functional dependence of stagnant thermal conductivity on porosity to be determined, with porosity varied in a range 0.50-0.85. Results obtained indicate that reduced bed porosity, down to the value of 0.65, causes stagnant thermal conductivity of the bed to be reduced. Further porosity reduction, below the value of 0.65, results in increased stagnant thermal conductivity of the bed. In addition, data to be acquired shall be helpful in modeling the transport phenomena associated with combustion in porous beds.",
publisher = "Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad",
journal = "Savremena poljoprivredna tehnika",
title = "Analiza uticaja vrste goriva na termofizičke karakteristike balirane biomase, Effects of types of fuels on thermo-physical properties of baled biomass",
pages = "206-197",
number = "4",
volume = "42",
doi = "10.5937/SavPoljTeh1604197E"
}

Erić, A., Dakić, D., Nemoda, S., Komatina, M.,& Repić, B.. (2016). Analiza uticaja vrste goriva na termofizičke karakteristike balirane biomase. in Savremena poljoprivredna tehnika
Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad., 42(4), 197-206.
https://doi.org/10.5937/SavPoljTeh1604197E

Erić A, Dakić D, Nemoda S, Komatina M, Repić B. Analiza uticaja vrste goriva na termofizičke karakteristike balirane biomase. in Savremena poljoprivredna tehnika. 2016;42(4):197-206.
doi:10.5937/SavPoljTeh1604197E .

Erić, Aleksandar, Dakić, Dragoljub, Nemoda, Stevan, Komatina, Mirko, Repić, Branislav, "Analiza uticaja vrste goriva na termofizičke karakteristike balirane biomase" in Savremena poljoprivredna tehnika, 42, no. 4 (2016):197-206,
https://doi.org/10.5937/SavPoljTeh1604197E . .

TY  - JOUR
AU  - Paprika, Milijana J.
AU  - Komatina, Mirko
AU  - Mladenović, Milica R.
AU  - Živković, Goran
AU  - Dakić, Dragoljub
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2309
AB  - In order to lay a foundation of a credible primacy fragmentation model, a theoretical analysis of the thermo-mechanical processes in a devolatilizing solid fuel particle was carried out. The devolatilization model comprises heat transfer, chemical processes of generation of gaseous products of combustion (volatiles), volatile transfer, and solid mechanic processes. A spatial and temporal analysis of the stresses within the particle showed that the radial stress is caused primarily by the pressure of generated volatiles. This stress monotonously decreases from the particle center towards the particle surface, without changing its sign. The tangential stress is caused primarily by the thermal shock. Close to the surface, it changes its sign. In the particle cross-section, the radial stress prevails close to the particle center, whilst the tangential stress is dominant in the surface region. At the points where these stresses exceed the particle tensile strength, cracks occur. Cracks extend tangentially close to the surface, and radially close to the center of the particle.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Mechanism of primary fragmentation of coal in fluidized bed
EP  - S132
SP  - S125
VL  - 20
DO  - 10.2298/TSCI150603224P
ER  - 

@article{
author = "Paprika, Milijana J. and Komatina, Mirko and Mladenović, Milica R. and Živković, Goran and Dakić, Dragoljub",
year = "2016",
abstract = "In order to lay a foundation of a credible primacy fragmentation model, a theoretical analysis of the thermo-mechanical processes in a devolatilizing solid fuel particle was carried out. The devolatilization model comprises heat transfer, chemical processes of generation of gaseous products of combustion (volatiles), volatile transfer, and solid mechanic processes. A spatial and temporal analysis of the stresses within the particle showed that the radial stress is caused primarily by the pressure of generated volatiles. This stress monotonously decreases from the particle center towards the particle surface, without changing its sign. The tangential stress is caused primarily by the thermal shock. Close to the surface, it changes its sign. In the particle cross-section, the radial stress prevails close to the particle center, whilst the tangential stress is dominant in the surface region. At the points where these stresses exceed the particle tensile strength, cracks occur. Cracks extend tangentially close to the surface, and radially close to the center of the particle.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Mechanism of primary fragmentation of coal in fluidized bed",
pages = "S132-S125",
volume = "20",
doi = "10.2298/TSCI150603224P"
}

Paprika, M. J., Komatina, M., Mladenović, M. R., Živković, G.,& Dakić, D.. (2016). Mechanism of primary fragmentation of coal in fluidized bed. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 20, S125-S132.
https://doi.org/10.2298/TSCI150603224P

Paprika MJ, Komatina M, Mladenović MR, Živković G, Dakić D. Mechanism of primary fragmentation of coal in fluidized bed. in Thermal Science. 2016;20:S125-S132.
doi:10.2298/TSCI150603224P .

Paprika, Milijana J., Komatina, Mirko, Mladenović, Milica R., Živković, Goran, Dakić, Dragoljub, "Mechanism of primary fragmentation of coal in fluidized bed" in Thermal Science, 20 (2016):S125-S132,
https://doi.org/10.2298/TSCI150603224P . .

TY  - JOUR
AU  - Erić, Aleksandar
AU  - Komatina, Mirko
AU  - Nemoda, Stevan
AU  - Dakić, Dragoljub
AU  - Repić, Branislav
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2413
AB  - Modeling of transport phenomena in materials with porous bed features requires thermophysical properties, such as porosity, permeability and thermal conductivity be known. The paper presents experimental data obtained in the course of investigation focused on analysis of stagnant thermal conductivity of biomass. Experiments were conducted using a custom designed and constructed experimental setup and implementing original experimental procedure. Results obtained enabled stagnant thermal conductivity of biomass to be determined for different biomass porosity values. Analysis of the experimental data enabled functional dependence of stagnant thermal conductivity on porosity to be determined, with porosity varied in a range 0.50-0.85. Results obtained indicate that reduced bed porosity, down to the value of 0.65, causes stagnant thermal conductivity of the bed to be reduced. Further porosity reduction, below the value of 0.65, results in increased stagnant thermal conductivity of the bed. Experimental procedure developed shall be useful for gathering experimental data on different materials planned to be analyzed when examining transport phenomena occurring during combustion of biomass bales. In addition, data to be acquired shall be helpful in modeling the transport phenomena associated with combustion in porous beds.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Renewable & Sustainable Energy Reviews
T1  - Determination of thermal conductivity of baled agricultural biomass
EP  - 884
SP  - 876
VL  - 58
DO  - 10.1016/j.rser.2015.12.066
ER  - 

@article{
author = "Erić, Aleksandar and Komatina, Mirko and Nemoda, Stevan and Dakić, Dragoljub and Repić, Branislav",
year = "2016",
abstract = "Modeling of transport phenomena in materials with porous bed features requires thermophysical properties, such as porosity, permeability and thermal conductivity be known. The paper presents experimental data obtained in the course of investigation focused on analysis of stagnant thermal conductivity of biomass. Experiments were conducted using a custom designed and constructed experimental setup and implementing original experimental procedure. Results obtained enabled stagnant thermal conductivity of biomass to be determined for different biomass porosity values. Analysis of the experimental data enabled functional dependence of stagnant thermal conductivity on porosity to be determined, with porosity varied in a range 0.50-0.85. Results obtained indicate that reduced bed porosity, down to the value of 0.65, causes stagnant thermal conductivity of the bed to be reduced. Further porosity reduction, below the value of 0.65, results in increased stagnant thermal conductivity of the bed. Experimental procedure developed shall be useful for gathering experimental data on different materials planned to be analyzed when examining transport phenomena occurring during combustion of biomass bales. In addition, data to be acquired shall be helpful in modeling the transport phenomena associated with combustion in porous beds.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Renewable & Sustainable Energy Reviews",
title = "Determination of thermal conductivity of baled agricultural biomass",
pages = "884-876",
volume = "58",
doi = "10.1016/j.rser.2015.12.066"
}

Erić, A., Komatina, M., Nemoda, S., Dakić, D.,& Repić, B.. (2016). Determination of thermal conductivity of baled agricultural biomass. in Renewable & Sustainable Energy Reviews
Pergamon-Elsevier Science Ltd, Oxford., 58, 876-884.
https://doi.org/10.1016/j.rser.2015.12.066

Erić A, Komatina M, Nemoda S, Dakić D, Repić B. Determination of thermal conductivity of baled agricultural biomass. in Renewable & Sustainable Energy Reviews. 2016;58:876-884.
doi:10.1016/j.rser.2015.12.066 .

Erić, Aleksandar, Komatina, Mirko, Nemoda, Stevan, Dakić, Dragoljub, Repić, Branislav, "Determination of thermal conductivity of baled agricultural biomass" in Renewable & Sustainable Energy Reviews, 58 (2016):876-884,
https://doi.org/10.1016/j.rser.2015.12.066 . .

TY  - JOUR
AU  - Paprika, Milijana J.
AU  - Komatina, Mirko
AU  - Dakić, Dragoljub
AU  - Živković, Goran
AU  - Mladenović, Milica
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2196
AB  - The paper presents a comparison between experimental and model results of primary fragmentation of a lignite coal in a fluidized bed (FB). In the experiments, the char particle size distribution and the general indicators of primary fragmentation (intensity and index) were determined. The same parameters were calculated using a mathematical model of the process, fed by data of the fuel (the amount of volatiles and fixed carbon), fluidized bed temperature; and inlet particle size distribution. The size distribution and number of the char particles in fluidized bed significantly differ from the size distribution and number of inlet coal particles. Char population has a bimodal distribution separate distributions for the smaller and larger sets of fragments. The experimental and model results show the same tendency: a coal particle partially breaks at the beginning of devolatilization, giving a large number of fine fragments, while, as the process continues, the rest of the parent particle sometimes breaks down into a smaller number of larger pieces, and sometimes does not fragment at all. Review of the Weibull distribution coefficients enables prediction of the char particle size distribution for the characteristic fluidized bed conditions and inlet coal particle sizes.
PB  - Amer Chemical Soc, Washington
T2  - Energy & Fuels
T1  - Experimental and Numerical Investigation of the Primary Fragmentation of a Lignite during Fluidized-Bed (FB) Devolatilization
EP  - 3398
IS  - 5
SP  - 3394
VL  - 29
DO  - 10.1021/ef5024803
ER  - 

@article{
author = "Paprika, Milijana J. and Komatina, Mirko and Dakić, Dragoljub and Živković, Goran and Mladenović, Milica",
year = "2015",
abstract = "The paper presents a comparison between experimental and model results of primary fragmentation of a lignite coal in a fluidized bed (FB). In the experiments, the char particle size distribution and the general indicators of primary fragmentation (intensity and index) were determined. The same parameters were calculated using a mathematical model of the process, fed by data of the fuel (the amount of volatiles and fixed carbon), fluidized bed temperature; and inlet particle size distribution. The size distribution and number of the char particles in fluidized bed significantly differ from the size distribution and number of inlet coal particles. Char population has a bimodal distribution separate distributions for the smaller and larger sets of fragments. The experimental and model results show the same tendency: a coal particle partially breaks at the beginning of devolatilization, giving a large number of fine fragments, while, as the process continues, the rest of the parent particle sometimes breaks down into a smaller number of larger pieces, and sometimes does not fragment at all. Review of the Weibull distribution coefficients enables prediction of the char particle size distribution for the characteristic fluidized bed conditions and inlet coal particle sizes.",
publisher = "Amer Chemical Soc, Washington",
journal = "Energy & Fuels",
title = "Experimental and Numerical Investigation of the Primary Fragmentation of a Lignite during Fluidized-Bed (FB) Devolatilization",
pages = "3398-3394",
number = "5",
volume = "29",
doi = "10.1021/ef5024803"
}

Paprika, M. J., Komatina, M., Dakić, D., Živković, G.,& Mladenović, M.. (2015). Experimental and Numerical Investigation of the Primary Fragmentation of a Lignite during Fluidized-Bed (FB) Devolatilization. in Energy & Fuels
Amer Chemical Soc, Washington., 29(5), 3394-3398.
https://doi.org/10.1021/ef5024803

Paprika MJ, Komatina M, Dakić D, Živković G, Mladenović M. Experimental and Numerical Investigation of the Primary Fragmentation of a Lignite during Fluidized-Bed (FB) Devolatilization. in Energy & Fuels. 2015;29(5):3394-3398.
doi:10.1021/ef5024803 .

Paprika, Milijana J., Komatina, Mirko, Dakić, Dragoljub, Živković, Goran, Mladenović, Milica, "Experimental and Numerical Investigation of the Primary Fragmentation of a Lignite during Fluidized-Bed (FB) Devolatilization" in Energy & Fuels, 29, no. 5 (2015):3394-3398,
https://doi.org/10.1021/ef5024803 . .

TY  - JOUR
AU  - Nemoda, Stevan
AU  - Mladenović, Milica
AU  - Paprika, Milijana J.
AU  - Dakić, Dragoljub
AU  - Erić, Aleksandar
AU  - Komatina, Mirko
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2106
AB  - This paper deals with the numerical simulation of liquid fuel combustion in a fluidized reactor using two-fluid Eulerian-Eulerian fluidized bed modeling incorporating the kinetic theory of granular flow (KTGF) to gas and solid phase flow prediction. The comprehensive model of the complex processes in a fluidized combustion chamber incorporates, besides the prediction of gas and particular phase velocity fields, the energy equations for the gas and solid phase and the transport equations of conservation of chemical species with the source terms due to the conversion of chemical components. Numerical experiments showed that the coefficients in the model of inter-phase interaction drag force have a significant effect, and they have to be adjusted for each regime of fluidization. A series of numerical experiments was performed with combustion of liquid fuels in a fluidized bed (FB), with and without significant water content. The given estimations were related to the unsteady state, and the modeled period corresponds to the passing time of the flow through the reactor column. The numerical experiments were conducted to examine the impact of the water content in a liquid fuel on the global FB combustion kinetics.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of The Serbian Chemical Society
T1  - Euler-Euler granular flow model of the combustion of liquid fuels in a fluidized reactor
EP  - 389
IS  - 3
SP  - 377
VL  - 80
DO  - 10.2298/JSC140130029N
ER  - 

@article{
author = "Nemoda, Stevan and Mladenović, Milica and Paprika, Milijana J. and Dakić, Dragoljub and Erić, Aleksandar and Komatina, Mirko",
year = "2015",
abstract = "This paper deals with the numerical simulation of liquid fuel combustion in a fluidized reactor using two-fluid Eulerian-Eulerian fluidized bed modeling incorporating the kinetic theory of granular flow (KTGF) to gas and solid phase flow prediction. The comprehensive model of the complex processes in a fluidized combustion chamber incorporates, besides the prediction of gas and particular phase velocity fields, the energy equations for the gas and solid phase and the transport equations of conservation of chemical species with the source terms due to the conversion of chemical components. Numerical experiments showed that the coefficients in the model of inter-phase interaction drag force have a significant effect, and they have to be adjusted for each regime of fluidization. A series of numerical experiments was performed with combustion of liquid fuels in a fluidized bed (FB), with and without significant water content. The given estimations were related to the unsteady state, and the modeled period corresponds to the passing time of the flow through the reactor column. The numerical experiments were conducted to examine the impact of the water content in a liquid fuel on the global FB combustion kinetics.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of The Serbian Chemical Society",
title = "Euler-Euler granular flow model of the combustion of liquid fuels in a fluidized reactor",
pages = "389-377",
number = "3",
volume = "80",
doi = "10.2298/JSC140130029N"
}

Nemoda, S., Mladenović, M., Paprika, M. J., Dakić, D., Erić, A.,& Komatina, M.. (2015). Euler-Euler granular flow model of the combustion of liquid fuels in a fluidized reactor. in Journal of The Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 80(3), 377-389.
https://doi.org/10.2298/JSC140130029N

Nemoda S, Mladenović M, Paprika MJ, Dakić D, Erić A, Komatina M. Euler-Euler granular flow model of the combustion of liquid fuels in a fluidized reactor. in Journal of The Serbian Chemical Society. 2015;80(3):377-389.
doi:10.2298/JSC140130029N .

Nemoda, Stevan, Mladenović, Milica, Paprika, Milijana J., Dakić, Dragoljub, Erić, Aleksandar, Komatina, Mirko, "Euler-Euler granular flow model of the combustion of liquid fuels in a fluidized reactor" in Journal of The Serbian Chemical Society, 80, no. 3 (2015):377-389,
https://doi.org/10.2298/JSC140130029N . .

TY  - JOUR
AU  - Mladenović, Milica R.
AU  - Dakić, Dragoljub
AU  - Nemoda, Stevan
AU  - Paprika, Milijana J.
AU  - Erić, Aleksandar M.
AU  - Repić, Branislav
AU  - Komatina, Mirko
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1829
AB  - Održivi razvoj domaće energetike podrazumeva racionalno korišćenje energetskih resursa, upotrebu obnovljivih izvora energije i upravljanje otpadom uz zadovoljenje ekoloških propisa. Način za istovremeno ispunjavanje navedenih ciljeva je energetsko iskorišćenje niskovrednih, otpadnih materija, primenom tehnologije sagorevanja u fluidizovanom sloju (FS). U radu su prikazani rezultati eksperimenata sagorevanja više vrsta čvrstih i tečnih otpadnih materija, obavljeni na dvema instalacijama: industrijsko-demonstracionom (snage do 500 kW) i eksperimentalnom FS kotlu (snage do 100 kW). Mereno je temperatursko polje po visini ložišta, analiziran sastav dimnih gasova na izlazu iz ložišta i ostali parametri sagorevanja predmetnih goriva. Analizom dobijenih rezultata data je ocena njihove podobnosti sagorevanja u FS uz mogućnost iskorišćenja njihovog energetskog potencijala.
AB  - The sustainable development of the national energy sector implies the rational use of energy resources, use of RES, and waste management with satisfying environmental regulations. A way to simultaneously fulfill the above objectives is the utilization of low-calorific and waste materials, applying the technology of fluidized bed combustion (FBC). This paper presents experimental results of combustion of number of solid and liquid wastes, conducted on two installations: industrial demonstration (capacity up to 100 kW) and experimental FB boiler (capacity up to 500 kW). The furnace temperature distribution, the composition of flue gas at the exit of furnace, and the other combustion parameters of the fuels are given. On the basis of these results, an evaluation of the waste fuels FB combustion and possibility of utilization of their energy potential is given.
PB  - Univerzitet u Beogradu - Tehnički fakultet u Boru, Beograd
T2  - Recycling and Sustainable Development
T1  - Rezultati sagorevanja različitih otpadnih goriva u fluidizovanom sloju
T1  - Results of combustion of different waste fuel in fluidized bad
EP  - 29
IS  - 1
SP  - 22
VL  - 7
DO  - 10.5937/ror1401022M
ER  - 

@article{
author = "Mladenović, Milica R. and Dakić, Dragoljub and Nemoda, Stevan and Paprika, Milijana J. and Erić, Aleksandar M. and Repić, Branislav and Komatina, Mirko",
year = "2014",
abstract = "Održivi razvoj domaće energetike podrazumeva racionalno korišćenje energetskih resursa, upotrebu obnovljivih izvora energije i upravljanje otpadom uz zadovoljenje ekoloških propisa. Način za istovremeno ispunjavanje navedenih ciljeva je energetsko iskorišćenje niskovrednih, otpadnih materija, primenom tehnologije sagorevanja u fluidizovanom sloju (FS). U radu su prikazani rezultati eksperimenata sagorevanja više vrsta čvrstih i tečnih otpadnih materija, obavljeni na dvema instalacijama: industrijsko-demonstracionom (snage do 500 kW) i eksperimentalnom FS kotlu (snage do 100 kW). Mereno je temperatursko polje po visini ložišta, analiziran sastav dimnih gasova na izlazu iz ložišta i ostali parametri sagorevanja predmetnih goriva. Analizom dobijenih rezultata data je ocena njihove podobnosti sagorevanja u FS uz mogućnost iskorišćenja njihovog energetskog potencijala., The sustainable development of the national energy sector implies the rational use of energy resources, use of RES, and waste management with satisfying environmental regulations. A way to simultaneously fulfill the above objectives is the utilization of low-calorific and waste materials, applying the technology of fluidized bed combustion (FBC). This paper presents experimental results of combustion of number of solid and liquid wastes, conducted on two installations: industrial demonstration (capacity up to 100 kW) and experimental FB boiler (capacity up to 500 kW). The furnace temperature distribution, the composition of flue gas at the exit of furnace, and the other combustion parameters of the fuels are given. On the basis of these results, an evaluation of the waste fuels FB combustion and possibility of utilization of their energy potential is given.",
publisher = "Univerzitet u Beogradu - Tehnički fakultet u Boru, Beograd",
journal = "Recycling and Sustainable Development",
title = "Rezultati sagorevanja različitih otpadnih goriva u fluidizovanom sloju, Results of combustion of different waste fuel in fluidized bad",
pages = "29-22",
number = "1",
volume = "7",
doi = "10.5937/ror1401022M"
}

Mladenović, M. R., Dakić, D., Nemoda, S., Paprika, M. J., Erić, A. M., Repić, B.,& Komatina, M.. (2014). Rezultati sagorevanja različitih otpadnih goriva u fluidizovanom sloju. in Recycling and Sustainable Development
Univerzitet u Beogradu - Tehnički fakultet u Boru, Beograd., 7(1), 22-29.
https://doi.org/10.5937/ror1401022M

Mladenović MR, Dakić D, Nemoda S, Paprika MJ, Erić AM, Repić B, Komatina M. Rezultati sagorevanja različitih otpadnih goriva u fluidizovanom sloju. in Recycling and Sustainable Development. 2014;7(1):22-29.
doi:10.5937/ror1401022M .

Mladenović, Milica R., Dakić, Dragoljub, Nemoda, Stevan, Paprika, Milijana J., Erić, Aleksandar M., Repić, Branislav, Komatina, Mirko, "Rezultati sagorevanja različitih otpadnih goriva u fluidizovanom sloju" in Recycling and Sustainable Development, 7, no. 1 (2014):22-29,
https://doi.org/10.5937/ror1401022M . .

TY  - JOUR
AU  - Paprika, Milijana J.
AU  - Komatina, Mirko
AU  - Dakić, Dragoljub
AU  - Nemoda, Stevan
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1727
AB  - The combination of temperature gradient and volatile release has been identified as the main cause for primary fragmentation (breakage of fuel particles during devolatilization). A mathematical model of the primary fragmentation in a fluidized bed has been developed, incorporating both causes. It takes into account the type of the coal, size of the coal particles, and the fluidized bed temperature. The model simulates fragmentation of a batch of coal particles. For each particle in the batch, the model follows propagation and merging of cracks, starting from randomly distributed pre-existing pores, leading to possible breakage of the particle. The model calculates volume of the fragmented particles and volume diameters, classifying them into size classes. For each size class, the number of particles is counted, and the mass fraction is calculated. The results are the distribution of mass and number of char particles after the devolatilization and the primary fragmentation parameters.
PB  - Amer Chemical Soc, Washington
T2  - Energy & Fuels
T1  - Prediction of Coal Primary Fragmentation and Char Particle Size Distribution in Fluidized Bed
EP  - 5494
IS  - 9
SP  - 5488
VL  - 27
DO  - 10.1021/ef400875q
ER  - 

@article{
author = "Paprika, Milijana J. and Komatina, Mirko and Dakić, Dragoljub and Nemoda, Stevan",
year = "2013",
abstract = "The combination of temperature gradient and volatile release has been identified as the main cause for primary fragmentation (breakage of fuel particles during devolatilization). A mathematical model of the primary fragmentation in a fluidized bed has been developed, incorporating both causes. It takes into account the type of the coal, size of the coal particles, and the fluidized bed temperature. The model simulates fragmentation of a batch of coal particles. For each particle in the batch, the model follows propagation and merging of cracks, starting from randomly distributed pre-existing pores, leading to possible breakage of the particle. The model calculates volume of the fragmented particles and volume diameters, classifying them into size classes. For each size class, the number of particles is counted, and the mass fraction is calculated. The results are the distribution of mass and number of char particles after the devolatilization and the primary fragmentation parameters.",
publisher = "Amer Chemical Soc, Washington",
journal = "Energy & Fuels",
title = "Prediction of Coal Primary Fragmentation and Char Particle Size Distribution in Fluidized Bed",
pages = "5494-5488",
number = "9",
volume = "27",
doi = "10.1021/ef400875q"
}

Paprika, M. J., Komatina, M., Dakić, D.,& Nemoda, S.. (2013). Prediction of Coal Primary Fragmentation and Char Particle Size Distribution in Fluidized Bed. in Energy & Fuels
Amer Chemical Soc, Washington., 27(9), 5488-5494.
https://doi.org/10.1021/ef400875q

Paprika MJ, Komatina M, Dakić D, Nemoda S. Prediction of Coal Primary Fragmentation and Char Particle Size Distribution in Fluidized Bed. in Energy & Fuels. 2013;27(9):5488-5494.
doi:10.1021/ef400875q .

Paprika, Milijana J., Komatina, Mirko, Dakić, Dragoljub, Nemoda, Stevan, "Prediction of Coal Primary Fragmentation and Char Particle Size Distribution in Fluidized Bed" in Energy & Fuels, 27, no. 9 (2013):5488-5494,
https://doi.org/10.1021/ef400875q . .

TY  - JOUR
AU  - Mladenović, Milica R.
AU  - Nemoda, Stevan
AU  - Komatina, Mirko
AU  - Dakić, Dragoljub
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1712
AB  - The paper deals with the development of mathematical models for detailed simulation of lateral jet penetration into the fluidized bed, primarily from the aspect of feeding of gaseous and liquid fuels into fluidized bed furnaces. For that purpose a series of comparisons has been performed between the results of in-house developed procedure -fluid-porous medium numerical simulation of gaseous jet penetration into the fluidized bed, Fluent's two-fluid Euler-Euler fluidized bed simulation model, and experimental results (from the literature) of gaseous jet penetration into the 2-D fluidized bed. The calculation results, using both models, and experimental data are in good agreement. The developed simulation procedures of jet penetration into the fluidized bed are applied to the analysis of the effects, which are registered during the experiments on a fluidized pilot furnace with feeding of liquid waste fuels into the bed, and brief description of the experiments is also presented in the paper. Registered effect suggests that the water in the fuel improved mixing of fuel and oxidizer in the fluidized bed furnace, by increasing jet penetration into the fluidized bed due to sudden evaporation of water at the entry into the furnace. In order to clarify this effect, numerical simulations of jet penetration into the fluidized bed with three-phase systems: gas (fuel, oxidizer, and water vapour), bed particles and water, have been carried out.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Numerical simulation of non-conventional liquid fuels feeding in a bubbling fluidized bed combustor
EP  - 1179
IS  - 4
SP  - 1163
VL  - 17
DO  - 10.2298/TSCI121116007M
ER  - 

@article{
author = "Mladenović, Milica R. and Nemoda, Stevan and Komatina, Mirko and Dakić, Dragoljub",
year = "2013",
abstract = "The paper deals with the development of mathematical models for detailed simulation of lateral jet penetration into the fluidized bed, primarily from the aspect of feeding of gaseous and liquid fuels into fluidized bed furnaces. For that purpose a series of comparisons has been performed between the results of in-house developed procedure -fluid-porous medium numerical simulation of gaseous jet penetration into the fluidized bed, Fluent's two-fluid Euler-Euler fluidized bed simulation model, and experimental results (from the literature) of gaseous jet penetration into the 2-D fluidized bed. The calculation results, using both models, and experimental data are in good agreement. The developed simulation procedures of jet penetration into the fluidized bed are applied to the analysis of the effects, which are registered during the experiments on a fluidized pilot furnace with feeding of liquid waste fuels into the bed, and brief description of the experiments is also presented in the paper. Registered effect suggests that the water in the fuel improved mixing of fuel and oxidizer in the fluidized bed furnace, by increasing jet penetration into the fluidized bed due to sudden evaporation of water at the entry into the furnace. In order to clarify this effect, numerical simulations of jet penetration into the fluidized bed with three-phase systems: gas (fuel, oxidizer, and water vapour), bed particles and water, have been carried out.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Numerical simulation of non-conventional liquid fuels feeding in a bubbling fluidized bed combustor",
pages = "1179-1163",
number = "4",
volume = "17",
doi = "10.2298/TSCI121116007M"
}

Mladenović, M. R., Nemoda, S., Komatina, M.,& Dakić, D.. (2013). Numerical simulation of non-conventional liquid fuels feeding in a bubbling fluidized bed combustor. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 17(4), 1163-1179.
https://doi.org/10.2298/TSCI121116007M

Mladenović MR, Nemoda S, Komatina M, Dakić D. Numerical simulation of non-conventional liquid fuels feeding in a bubbling fluidized bed combustor. in Thermal Science. 2013;17(4):1163-1179.
doi:10.2298/TSCI121116007M .

Mladenović, Milica R., Nemoda, Stevan, Komatina, Mirko, Dakić, Dragoljub, "Numerical simulation of non-conventional liquid fuels feeding in a bubbling fluidized bed combustor" in Thermal Science, 17, no. 4 (2013):1163-1179,
https://doi.org/10.2298/TSCI121116007M . .

TY  - JOUR
AU  - Dakić, Dragoljub
AU  - Živković, Goran
AU  - Repić, Branislav
AU  - Rudonja, Nedžad
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1644
AB  - Biomasa je najveći potencijal obnovljive energije u Republici Srbiji. Postoji zaostatak u njenoj organizovanoj, specijalno industrijskoj, upotrebi u odnosu na potencijal. Pored niza objektivnih okolnosti zašto je to tako jedan leži i u karakteristikama rada kotlova i ložišta u kojima se primenjuje biomasa. Kotlovi i ložišta u kojima se primenjuje biomasa moraju dobrim delom biti ozidani (adijabatski) kako bi se stvorili uslovi potpunog sagorevanja i na niskim temperaturama. Niske temperature sagorevanja su poželjne zbog niske temperature topivosti pepela. To specijalno važi pri primeni poljoprivredne biomase. Takve kotlove i ložišta nije poželjno često paliti i gasiti, već je povoljno da oni rade u kontinuitetu. Pored toga takvi kotlovi i ložišta nemaju mogući raspon snaga kao slični uređaji koji rade na gasovito ili tečno gorivo. Obično mogu raditi u opsegu snaga 50-100%. Sa druge strane očekuje se da se takvi kotlovi najviše koriste u sistemima za grejanje i/ili u industrijskim pogonima za preradu poljoprivrednih proizvoda ili za njihov uzgoj. Ni jedna od navedenih očekivanih primena nema potrebu za kontinualnim radom niti ujednačenu potrebu za energijom tokom rada. U radu je prikazano, kroz primere u praksi, kako se navedeni problemi mogu rešiti ili ublažiti primenom akumulatora toplote, a bez povećanja ili sa minimalnim povećanjem investicionih troškova.
AB  - Biomass represents the largest renewable energy sources in the Republic of Serbia. Still, there exists a huge gap between this potential and its organized use, especially in industry. One of the reasons for this lies in characteristics of boilers and furnaces that use biomass. In order to fulfill conditions for complete biomass combustion even at low temperatures these furnaces have to be adiabatic. Low combustion temperatures are desirable due to the low melting temperatures of biomass ash (especially in case of agricultural biomass). Such boilers and furnaces should work continually. Their usual power range is 50-100%. On the other side, they are expected to be used most often for heating or in industrial plants that produce agricultural products. Their common characteristic is that they do not have need for continual energy supply during work. This paper show, through few examples, how such problems could be solved in practice using thermal energy storages, without or with minimal additional costs.
PB  - Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad
T2  - Savremena poljoprivredna tehnika
T1  - Prednosti primene akumulatora toplote pri korišćenju biomase kao energenta
T1  - Advantages of use thermal storage tank when using biomass as energy source
EP  - 244
IS  - 4
SP  - 237
VL  - 39
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1644
ER  - 

@article{
author = "Dakić, Dragoljub and Živković, Goran and Repić, Branislav and Rudonja, Nedžad",
year = "2013",
abstract = "Biomasa je najveći potencijal obnovljive energije u Republici Srbiji. Postoji zaostatak u njenoj organizovanoj, specijalno industrijskoj, upotrebi u odnosu na potencijal. Pored niza objektivnih okolnosti zašto je to tako jedan leži i u karakteristikama rada kotlova i ložišta u kojima se primenjuje biomasa. Kotlovi i ložišta u kojima se primenjuje biomasa moraju dobrim delom biti ozidani (adijabatski) kako bi se stvorili uslovi potpunog sagorevanja i na niskim temperaturama. Niske temperature sagorevanja su poželjne zbog niske temperature topivosti pepela. To specijalno važi pri primeni poljoprivredne biomase. Takve kotlove i ložišta nije poželjno često paliti i gasiti, već je povoljno da oni rade u kontinuitetu. Pored toga takvi kotlovi i ložišta nemaju mogući raspon snaga kao slični uređaji koji rade na gasovito ili tečno gorivo. Obično mogu raditi u opsegu snaga 50-100%. Sa druge strane očekuje se da se takvi kotlovi najviše koriste u sistemima za grejanje i/ili u industrijskim pogonima za preradu poljoprivrednih proizvoda ili za njihov uzgoj. Ni jedna od navedenih očekivanih primena nema potrebu za kontinualnim radom niti ujednačenu potrebu za energijom tokom rada. U radu je prikazano, kroz primere u praksi, kako se navedeni problemi mogu rešiti ili ublažiti primenom akumulatora toplote, a bez povećanja ili sa minimalnim povećanjem investicionih troškova., Biomass represents the largest renewable energy sources in the Republic of Serbia. Still, there exists a huge gap between this potential and its organized use, especially in industry. One of the reasons for this lies in characteristics of boilers and furnaces that use biomass. In order to fulfill conditions for complete biomass combustion even at low temperatures these furnaces have to be adiabatic. Low combustion temperatures are desirable due to the low melting temperatures of biomass ash (especially in case of agricultural biomass). Such boilers and furnaces should work continually. Their usual power range is 50-100%. On the other side, they are expected to be used most often for heating or in industrial plants that produce agricultural products. Their common characteristic is that they do not have need for continual energy supply during work. This paper show, through few examples, how such problems could be solved in practice using thermal energy storages, without or with minimal additional costs.",
publisher = "Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad",
journal = "Savremena poljoprivredna tehnika",
title = "Prednosti primene akumulatora toplote pri korišćenju biomase kao energenta, Advantages of use thermal storage tank when using biomass as energy source",
pages = "244-237",
number = "4",
volume = "39",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1644"
}

Dakić, D., Živković, G., Repić, B.,& Rudonja, N.. (2013). Prednosti primene akumulatora toplote pri korišćenju biomase kao energenta. in Savremena poljoprivredna tehnika
Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad., 39(4), 237-244.
https://hdl.handle.net/21.15107/rcub_machinery_1644

Dakić D, Živković G, Repić B, Rudonja N. Prednosti primene akumulatora toplote pri korišćenju biomase kao energenta. in Savremena poljoprivredna tehnika. 2013;39(4):237-244.
https://hdl.handle.net/21.15107/rcub_machinery_1644 .

Dakić, Dragoljub, Živković, Goran, Repić, Branislav, Rudonja, Nedžad, "Prednosti primene akumulatora toplote pri korišćenju biomase kao energenta" in Savremena poljoprivredna tehnika, 39, no. 4 (2013):237-244,
https://hdl.handle.net/21.15107/rcub_machinery_1644 .

TY  - JOUR
AU  - Mladenović, Milica R.
AU  - Dakić, Dragoljub
AU  - Nemoda, Stevan
AU  - Mladenović, Rastko
AU  - Erić, Aleksandar M.
AU  - Repić, Branislav
AU  - Komatina, Mirko
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1371
AB  - In this paper a method of examination of fuel suitability for fluidized bed combustion is presented. The research of combustion characteristics of low grade fractions of Lubnica brown coal in the fluidized bed by the aforementioned methodology has been carried out on a laboratory semi-industrial apparatus of 200 kWt. Description of the experimental fluidized bed combustion facility is given, as well as experimental results, with the focus on furnace temperature distribution, in order to determine the location of the zone of intensive combustion. Based on investigation results, which are focused on combustion quality (combustion completion) as well as on satisfying the environmental protection criteria, it can be stated that the investigated coal is suitable for burning in bubbling, as well as in circulating fluidized bed.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Combustion of low grade fractions of Lubnica coal in fluidized bed
EP  - 311
IS  - 1
SP  - 297
VL  - 16
DO  - 10.2298/TSCI1201297M
ER  - 

@article{
author = "Mladenović, Milica R. and Dakić, Dragoljub and Nemoda, Stevan and Mladenović, Rastko and Erić, Aleksandar M. and Repić, Branislav and Komatina, Mirko",
year = "2012",
abstract = "In this paper a method of examination of fuel suitability for fluidized bed combustion is presented. The research of combustion characteristics of low grade fractions of Lubnica brown coal in the fluidized bed by the aforementioned methodology has been carried out on a laboratory semi-industrial apparatus of 200 kWt. Description of the experimental fluidized bed combustion facility is given, as well as experimental results, with the focus on furnace temperature distribution, in order to determine the location of the zone of intensive combustion. Based on investigation results, which are focused on combustion quality (combustion completion) as well as on satisfying the environmental protection criteria, it can be stated that the investigated coal is suitable for burning in bubbling, as well as in circulating fluidized bed.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Combustion of low grade fractions of Lubnica coal in fluidized bed",
pages = "311-297",
number = "1",
volume = "16",
doi = "10.2298/TSCI1201297M"
}

Mladenović, M. R., Dakić, D., Nemoda, S., Mladenović, R., Erić, A. M., Repić, B.,& Komatina, M.. (2012). Combustion of low grade fractions of Lubnica coal in fluidized bed. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 16(1), 297-311.
https://doi.org/10.2298/TSCI1201297M

Mladenović MR, Dakić D, Nemoda S, Mladenović R, Erić AM, Repić B, Komatina M. Combustion of low grade fractions of Lubnica coal in fluidized bed. in Thermal Science. 2012;16(1):297-311.
doi:10.2298/TSCI1201297M .

Mladenović, Milica R., Dakić, Dragoljub, Nemoda, Stevan, Mladenović, Rastko, Erić, Aleksandar M., Repić, Branislav, Komatina, Mirko, "Combustion of low grade fractions of Lubnica coal in fluidized bed" in Thermal Science, 16, no. 1 (2012):297-311,
https://doi.org/10.2298/TSCI1201297M . .

TY  - CONF
AU  - Živković, Goran
AU  - Dakić, Dragoljub
AU  - Rudonja, Nedžad
AU  - Repić, Branislav
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4875
AB  - Introduction of thermal storage tanks (TST) in facilities that use renewable energy resources
represents a good way to increase their energy efficiency. This paper surveys a part of the activities
(performed during the realization of the second year of project III 42011 financed by the Ministry of
education and science of the Republic of Serbia) on the development of TST whose storage medium
melts at the atmospheric pressure, enabling on that way the use of the energy of phase change for
energy storage. TST of this type enable more thermal energy storage per volume unit, but also
(depending of the working medium) enable higher temperatures of the working medium, which is
necessary in the co-generated facilities. For the purpose of the experimental research of thermal and
flow processes in TST in the Laboratory for thermal engineering and energy of the Vinča Institute a
prototype of TST was designed and made. It has a cylindrical shape, with the working volume of 77
dm3. The working material is heated by 2.4 kW electric heater positioned along the TST axes, and
is cooled by the air which circulates around the tank. The measurement of temperature inside the
tank was performed by 16 thermocouples, 4 along the tanks height and 4 along the tanks radius. For
the purpose of this work paraffin as a working medium was used. Measurements were performed
for non-stationary as well as for stationary working regimes. As a result, an extensive set of
experimental data was obtained, which, in the later work on the project, will serve in the numerical
study, as a basis for the developing a numerical model, to verify its results and, if necessary, to
correct the model.
PB  - Beograd : Društvo termičara Srbije
C3  - Зборник радова са Међународне конференције Електране 2012
T1  - EXPERIMENTAL RESEARCH OF THERMAL PROCESSES IN THE THERMAL STORAGE TANK WITH A PHASE CHANGE MEDIUM
EP  - 1149
SP  - 1138
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4875
ER  - 

@conference{
author = "Živković, Goran and Dakić, Dragoljub and Rudonja, Nedžad and Repić, Branislav",
year = "2012",
abstract = "Introduction of thermal storage tanks (TST) in facilities that use renewable energy resources
represents a good way to increase their energy efficiency. This paper surveys a part of the activities
(performed during the realization of the second year of project III 42011 financed by the Ministry of
education and science of the Republic of Serbia) on the development of TST whose storage medium
melts at the atmospheric pressure, enabling on that way the use of the energy of phase change for
energy storage. TST of this type enable more thermal energy storage per volume unit, but also
(depending of the working medium) enable higher temperatures of the working medium, which is
necessary in the co-generated facilities. For the purpose of the experimental research of thermal and
flow processes in TST in the Laboratory for thermal engineering and energy of the Vinča Institute a
prototype of TST was designed and made. It has a cylindrical shape, with the working volume of 77
dm3. The working material is heated by 2.4 kW electric heater positioned along the TST axes, and
is cooled by the air which circulates around the tank. The measurement of temperature inside the
tank was performed by 16 thermocouples, 4 along the tanks height and 4 along the tanks radius. For
the purpose of this work paraffin as a working medium was used. Measurements were performed
for non-stationary as well as for stationary working regimes. As a result, an extensive set of
experimental data was obtained, which, in the later work on the project, will serve in the numerical
study, as a basis for the developing a numerical model, to verify its results and, if necessary, to
correct the model.",
publisher = "Beograd : Društvo termičara Srbije",
journal = "Зборник радова са Међународне конференције Електране 2012",
title = "EXPERIMENTAL RESEARCH OF THERMAL PROCESSES IN THE THERMAL STORAGE TANK WITH A PHASE CHANGE MEDIUM",
pages = "1149-1138",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4875"
}

Živković, G., Dakić, D., Rudonja, N.,& Repić, B.. (2012). EXPERIMENTAL RESEARCH OF THERMAL PROCESSES IN THE THERMAL STORAGE TANK WITH A PHASE CHANGE MEDIUM. in Зборник радова са Међународне конференције Електране 2012
Beograd : Društvo termičara Srbije., 1138-1149.
https://hdl.handle.net/21.15107/rcub_machinery_4875

Živković G, Dakić D, Rudonja N, Repić B. EXPERIMENTAL RESEARCH OF THERMAL PROCESSES IN THE THERMAL STORAGE TANK WITH A PHASE CHANGE MEDIUM. in Зборник радова са Међународне конференције Електране 2012. 2012;:1138-1149.
https://hdl.handle.net/21.15107/rcub_machinery_4875 .

Živković, Goran, Dakić, Dragoljub, Rudonja, Nedžad, Repić, Branislav, "EXPERIMENTAL RESEARCH OF THERMAL PROCESSES IN THE THERMAL STORAGE TANK WITH A PHASE CHANGE MEDIUM" in Зборник радова са Међународне конференције Електране 2012 (2012):1138-1149,
https://hdl.handle.net/21.15107/rcub_machinery_4875 .

TY  - JOUR
AU  - Mladenović, Milica R.
AU  - Paprika, Milijana J.
AU  - Dakić, Dragoljub
AU  - Nemoda, Stevan
AU  - Erić, Aleksandar M.
AU  - Komatina, Mirko
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1408
AB  - Ovaj rad je prilog istraživanju sagorevanja čvrstih i tečnih otpadnih goriva. U tečna otpadna goriva čije odlaganje predstavlja ekološki problem ubrajamo talog iz rezervoara sirove nafte kao i korišćena jestiva/mineralna ulja i glicerin kao nus-produkt proizvodnje biodizela. Pored toga, ove materije, zbog neujednačenog sastava i gustine kao i visokog udela balasta, se ne mogu sagorevati u konvencionalnim ložištima, pa je tehnologija pogodna za njihovu toplotnu dezintegraciju fluidizovani sloj jer omogućava sagorevanje najrazličitijih vrsta goriva neuniformnog sastava. U čvrsta otpadna goriva ubrajamo i vanbilansne rezerve uglja (sitne granulacije, sa visokim sadržajem mineralnih materija i niskom toplotnom moći) koje je potrebno koristiti racionalnije, što opet podrazumeva primenu ložišta sa fluidizovanim slojem. U kotlovima sa fluidizovanim slojem mogu se sagorevati čvrsta goriva sa 85% inertnih materija, sa efikasnim odsumporavanjem dodavanjem krečnjaka direktno u ložište, sa niskom emisijom NOx, što ovoj tehnologiji daje značajnu prednost u poređenju sa drugim tehnologijama sagorevanja. U radu je dat opis eksperimentalne instalacije, kao i rezultat eksperimenata, sa naglaskom na raspodelu temperature po visini ložišta, u cilju određivanja zone intenzivnog sagorevanja u zavisnosti od karakteristika goriva.
AB  - This paper is a contribution to the investigation of combustion of waste liquid and solid fuels. Waste liquid fuels include sediment from crude-fuel oil tanks or used edible/mineral oils, the disposal of which is most of ten linked to environmental issues. In addition, these substances, due to high ballast content, non-uniform composition and density, can not be burnt in conventional combustors, hence the technology of thermal disintegration in the fluidized bed (FB) imposes as a solution, which enables the combustion of fuels of most distinct types and non-uniform compositions. Waste solid fuels refer to coals from off-balance reserves (fine-grained, with high ballast and sulfur contents and low heating values) which should be used more rationally, implying the application of the FB combustion (FBC) as well. The fact that FB boilers can burn fuels with 85% of inert materials, with effective retention of SO2 by adding lime stone into the furnace, and with lower NOx emissions, gives FBC significant advantages, compared to other combustion technologies. Description of the experimental FBC facility is given, as well as experimental results, with the focus on the furnace temperature distribution, in order to determine the location of the intensive combustion zone as a function of fuel properties. .
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd i Društvo termičara Srbije, Beograd
T2  - Termotehnika
T1  - Vertikalni profil temperature u instalaciji za sagorevanje otpadnih goriva sa fluidizovanim slojem
T1  - Vertical temperature profile in the fluidized bed installation for combustion of waste fuels
EP  - 24
IS  - 1
SP  - 11
VL  - 38
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1408
ER  - 

@article{
author = "Mladenović, Milica R. and Paprika, Milijana J. and Dakić, Dragoljub and Nemoda, Stevan and Erić, Aleksandar M. and Komatina, Mirko",
year = "2012",
abstract = "Ovaj rad je prilog istraživanju sagorevanja čvrstih i tečnih otpadnih goriva. U tečna otpadna goriva čije odlaganje predstavlja ekološki problem ubrajamo talog iz rezervoara sirove nafte kao i korišćena jestiva/mineralna ulja i glicerin kao nus-produkt proizvodnje biodizela. Pored toga, ove materije, zbog neujednačenog sastava i gustine kao i visokog udela balasta, se ne mogu sagorevati u konvencionalnim ložištima, pa je tehnologija pogodna za njihovu toplotnu dezintegraciju fluidizovani sloj jer omogućava sagorevanje najrazličitijih vrsta goriva neuniformnog sastava. U čvrsta otpadna goriva ubrajamo i vanbilansne rezerve uglja (sitne granulacije, sa visokim sadržajem mineralnih materija i niskom toplotnom moći) koje je potrebno koristiti racionalnije, što opet podrazumeva primenu ložišta sa fluidizovanim slojem. U kotlovima sa fluidizovanim slojem mogu se sagorevati čvrsta goriva sa 85% inertnih materija, sa efikasnim odsumporavanjem dodavanjem krečnjaka direktno u ložište, sa niskom emisijom NOx, što ovoj tehnologiji daje značajnu prednost u poređenju sa drugim tehnologijama sagorevanja. U radu je dat opis eksperimentalne instalacije, kao i rezultat eksperimenata, sa naglaskom na raspodelu temperature po visini ložišta, u cilju određivanja zone intenzivnog sagorevanja u zavisnosti od karakteristika goriva., This paper is a contribution to the investigation of combustion of waste liquid and solid fuels. Waste liquid fuels include sediment from crude-fuel oil tanks or used edible/mineral oils, the disposal of which is most of ten linked to environmental issues. In addition, these substances, due to high ballast content, non-uniform composition and density, can not be burnt in conventional combustors, hence the technology of thermal disintegration in the fluidized bed (FB) imposes as a solution, which enables the combustion of fuels of most distinct types and non-uniform compositions. Waste solid fuels refer to coals from off-balance reserves (fine-grained, with high ballast and sulfur contents and low heating values) which should be used more rationally, implying the application of the FB combustion (FBC) as well. The fact that FB boilers can burn fuels with 85% of inert materials, with effective retention of SO2 by adding lime stone into the furnace, and with lower NOx emissions, gives FBC significant advantages, compared to other combustion technologies. Description of the experimental FBC facility is given, as well as experimental results, with the focus on the furnace temperature distribution, in order to determine the location of the intensive combustion zone as a function of fuel properties. .",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd i Društvo termičara Srbije, Beograd",
journal = "Termotehnika",
title = "Vertikalni profil temperature u instalaciji za sagorevanje otpadnih goriva sa fluidizovanim slojem, Vertical temperature profile in the fluidized bed installation for combustion of waste fuels",
pages = "24-11",
number = "1",
volume = "38",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1408"
}

Mladenović, M. R., Paprika, M. J., Dakić, D., Nemoda, S., Erić, A. M.,& Komatina, M.. (2012). Vertikalni profil temperature u instalaciji za sagorevanje otpadnih goriva sa fluidizovanim slojem. in Termotehnika
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd i Društvo termičara Srbije, Beograd., 38(1), 11-24.
https://hdl.handle.net/21.15107/rcub_machinery_1408

Mladenović MR, Paprika MJ, Dakić D, Nemoda S, Erić AM, Komatina M. Vertikalni profil temperature u instalaciji za sagorevanje otpadnih goriva sa fluidizovanim slojem. in Termotehnika. 2012;38(1):11-24.
https://hdl.handle.net/21.15107/rcub_machinery_1408 .

Mladenović, Milica R., Paprika, Milijana J., Dakić, Dragoljub, Nemoda, Stevan, Erić, Aleksandar M., Komatina, Mirko, "Vertikalni profil temperature u instalaciji za sagorevanje otpadnih goriva sa fluidizovanim slojem" in Termotehnika, 38, no. 1 (2012):11-24,
https://hdl.handle.net/21.15107/rcub_machinery_1408 .

TY  - JOUR
AU  - Erić, Aleksandar
AU  - Dakić, Dragoljub
AU  - Nemoda, Stevan
AU  - Komatina, Mirko
AU  - Repić, Branislav
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1494
AB  - The paper presents the results of an experimental investigation conducted to determine the permeability coefficients and the stagnant thermal conductivity i.e. the thermo physical properties deemed to be the most important features of the bed material when considering combustion in pusher-type furnaces (i.e. combustion of biomass bales in cigar burners). The appropriate experimental methods have been developed and suitable experimental apparatus designed and constructed in order to determine permeability and stagnant thermal conductivity coefficient of the soybean straw bales. The experimental investigation conducted was aimed at examining the effects of relevant biomass bale parameters on the aforementioned coefficients. Based on the numerous measurements performed, correlations were obtained that are deemed highly important for optimization of the biomass bale combustion, as well as for modeling the transport phenomena occurring in the porous bed formed during biomass bales combustion in cigar burners. Data collected during the course of research investigation were used to develop a detailed CFD model of straw bales combustion in cigar burners.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Energy
T1  - Experimental determination thermo physical characteristics of balled biomass
EP  - 357
IS  - 1
SP  - 350
VL  - 45
DO  - 10.1016/j.energy.2012.02.063
ER  - 

@article{
author = "Erić, Aleksandar and Dakić, Dragoljub and Nemoda, Stevan and Komatina, Mirko and Repić, Branislav",
year = "2012",
abstract = "The paper presents the results of an experimental investigation conducted to determine the permeability coefficients and the stagnant thermal conductivity i.e. the thermo physical properties deemed to be the most important features of the bed material when considering combustion in pusher-type furnaces (i.e. combustion of biomass bales in cigar burners). The appropriate experimental methods have been developed and suitable experimental apparatus designed and constructed in order to determine permeability and stagnant thermal conductivity coefficient of the soybean straw bales. The experimental investigation conducted was aimed at examining the effects of relevant biomass bale parameters on the aforementioned coefficients. Based on the numerous measurements performed, correlations were obtained that are deemed highly important for optimization of the biomass bale combustion, as well as for modeling the transport phenomena occurring in the porous bed formed during biomass bales combustion in cigar burners. Data collected during the course of research investigation were used to develop a detailed CFD model of straw bales combustion in cigar burners.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Energy",
title = "Experimental determination thermo physical characteristics of balled biomass",
pages = "357-350",
number = "1",
volume = "45",
doi = "10.1016/j.energy.2012.02.063"
}

Erić, A., Dakić, D., Nemoda, S., Komatina, M.,& Repić, B.. (2012). Experimental determination thermo physical characteristics of balled biomass. in Energy
Pergamon-Elsevier Science Ltd, Oxford., 45(1), 350-357.
https://doi.org/10.1016/j.energy.2012.02.063

Erić A, Dakić D, Nemoda S, Komatina M, Repić B. Experimental determination thermo physical characteristics of balled biomass. in Energy. 2012;45(1):350-357.
doi:10.1016/j.energy.2012.02.063 .

Erić, Aleksandar, Dakić, Dragoljub, Nemoda, Stevan, Komatina, Mirko, Repić, Branislav, "Experimental determination thermo physical characteristics of balled biomass" in Energy, 45, no. 1 (2012):350-357,
https://doi.org/10.1016/j.energy.2012.02.063 . .

TY  - JOUR
AU  - Erić, Aleksandar
AU  - Dakić, Dragoljub
AU  - Nemoda, Stevan
AU  - Komatina, Mirko
AU  - Repić, Branislav
AU  - Mladenović, Milica
AU  - Đurović, Dejan
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1186
AB  - U radu su prikazani rezultati eksperimentalnih istraživanja sagorevanja baliranog sojinog ostatka na poluindustrijskom postrojenju toplotne snage 1,5 MW koje radi po principu cigaretnog sagorevanja. Istraživanja su sprovedena u cilju određivanja neophodnih ulaznih parametara za formiranje odgovarajućeg matematičkog modela procesa cigaretnog načina sagorevanja biomase. Eksperimentom su merene ulazne veličine kao što su: maseni protoci goriva, vazduha za sagorevanje, temperature i sastav dimnog gasa na izlaznom preseku razmatranog proračunskog domena. Osim merenja ulaznih (bilansnih) veličina koje su bitne za proces sagorevanja, izvršeno je i određivanje temperaturnog profila u središnjoj ravni bale sojinog ostatka koja učestvuje u procesu sagorevanja. Dobijeni rezultati su od izuzetnog značaja ne samo za formiranje matematičkog modela procesa sagorevanja već i za sveobuhvatno sagledavanje i razumevanje transportnih procesa koji se odvijaju pri sagorevanju po novom i još uvek nedovoljno istraženom principu cigaretnog sagorevanja.
AB  - This paper presents the experimental research results of baled soy straw combustion on 1,5 MW semi-industrial plant that works on the cigarette combustion principle. The researches were conducted to determine the necessary input parameters for the development of an appropriate combustion process mathematical model of the proposed cigarette combustion method. Experiments have measured the input data such as the fuel mass flows, combustion air, temperatures and flue gas composition at the outlet section of the calculated domain. Beside measurement input data that are important for the combustion process, the determination of temperature profiles in the central plane of soy straw has been conducted. Presented experimental results are significant not only for the cigarette combustion process mathematical modelling, but for a comprehensive analysis and understanding of transport processes that take place during the new and still not sufficiently researched combustion principle.
PB  - Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad
T2  - Savremena poljoprivredna tehnika
T1  - Eksperimentalna istraživanja u ložištu sa cigaretnim sagorevanjem baliranog sojinog ostatka
T1  - Experimental investigation of baled soy straw combustion in cigarette furnace
EP  - 164
IS  - 2
SP  - 153
VL  - 37
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1186
ER  - 

@article{
author = "Erić, Aleksandar and Dakić, Dragoljub and Nemoda, Stevan and Komatina, Mirko and Repić, Branislav and Mladenović, Milica and Đurović, Dejan",
year = "2011",
abstract = "U radu su prikazani rezultati eksperimentalnih istraživanja sagorevanja baliranog sojinog ostatka na poluindustrijskom postrojenju toplotne snage 1,5 MW koje radi po principu cigaretnog sagorevanja. Istraživanja su sprovedena u cilju određivanja neophodnih ulaznih parametara za formiranje odgovarajućeg matematičkog modela procesa cigaretnog načina sagorevanja biomase. Eksperimentom su merene ulazne veličine kao što su: maseni protoci goriva, vazduha za sagorevanje, temperature i sastav dimnog gasa na izlaznom preseku razmatranog proračunskog domena. Osim merenja ulaznih (bilansnih) veličina koje su bitne za proces sagorevanja, izvršeno je i određivanje temperaturnog profila u središnjoj ravni bale sojinog ostatka koja učestvuje u procesu sagorevanja. Dobijeni rezultati su od izuzetnog značaja ne samo za formiranje matematičkog modela procesa sagorevanja već i za sveobuhvatno sagledavanje i razumevanje transportnih procesa koji se odvijaju pri sagorevanju po novom i još uvek nedovoljno istraženom principu cigaretnog sagorevanja., This paper presents the experimental research results of baled soy straw combustion on 1,5 MW semi-industrial plant that works on the cigarette combustion principle. The researches were conducted to determine the necessary input parameters for the development of an appropriate combustion process mathematical model of the proposed cigarette combustion method. Experiments have measured the input data such as the fuel mass flows, combustion air, temperatures and flue gas composition at the outlet section of the calculated domain. Beside measurement input data that are important for the combustion process, the determination of temperature profiles in the central plane of soy straw has been conducted. Presented experimental results are significant not only for the cigarette combustion process mathematical modelling, but for a comprehensive analysis and understanding of transport processes that take place during the new and still not sufficiently researched combustion principle.",
publisher = "Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad",
journal = "Savremena poljoprivredna tehnika",
title = "Eksperimentalna istraživanja u ložištu sa cigaretnim sagorevanjem baliranog sojinog ostatka, Experimental investigation of baled soy straw combustion in cigarette furnace",
pages = "164-153",
number = "2",
volume = "37",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1186"
}

Erić, A., Dakić, D., Nemoda, S., Komatina, M., Repić, B., Mladenović, M.,& Đurović, D.. (2011). Eksperimentalna istraživanja u ložištu sa cigaretnim sagorevanjem baliranog sojinog ostatka. in Savremena poljoprivredna tehnika
Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad., 37(2), 153-164.
https://hdl.handle.net/21.15107/rcub_machinery_1186

Erić A, Dakić D, Nemoda S, Komatina M, Repić B, Mladenović M, Đurović D. Eksperimentalna istraživanja u ložištu sa cigaretnim sagorevanjem baliranog sojinog ostatka. in Savremena poljoprivredna tehnika. 2011;37(2):153-164.
https://hdl.handle.net/21.15107/rcub_machinery_1186 .

Erić, Aleksandar, Dakić, Dragoljub, Nemoda, Stevan, Komatina, Mirko, Repić, Branislav, Mladenović, Milica, Đurović, Dejan, "Eksperimentalna istraživanja u ložištu sa cigaretnim sagorevanjem baliranog sojinog ostatka" in Savremena poljoprivredna tehnika, 37, no. 2 (2011):153-164,
https://hdl.handle.net/21.15107/rcub_machinery_1186 .

TY  - JOUR
AU  - Erić, Aleksandar
AU  - Dakić, Dragoljub
AU  - Nemoda, Stevan
AU  - Komatina, Mirko
AU  - Repić, Branislav
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1231
AB  - The paper presents results of experimental investigation conducted to determine permeability coefficient of a porous bed formed by biomass bales, whereby the said coefficient represents one of the most important parameters of the bed material specified when considering its combustion in the pusher-type furnaces (i.e. combustion of biomass bales in cigar burners). Correlations obtained are deemed very important for optimization of biomass bale combustion, as well as for modeling transport phenomena occurring in the porous bed formed by biomass bales during their combustion in cigar burners. In order to determine permeability coefficient of air flow through soy straw bales, appropriate experimental method was developed and suitable experimental apparatus designed and constructed. The relevant coefficients were determined in such manner as to be representative of the viscous and inertial terms of the Forchheimer equation. Experimental investigation conducted examined the effects of relevant biomass bale parameters i.e. porosity and the moisture content on the abovementioned Forchheimer coefficients. Measurements conducted, as well as analysis of the results obtained, defined functional dependencies of the permeability coefficients on the porosity (which was varied in the range 0.62-0.78, for moisture content of 0.0948) and the sample's moisture content (which was varied in the range 0.0948-0.6394, for the selected value of porosity of 0.68) to be established. The correlations obtained are deemed suitable to be used in a broad spectrum of operating conditions that usually occur during real operation. Results obtained indicate that reduction in biomass bed porosity results in reduced permeability, with Forchheimer coefficients exhibiting a hyperbolic dependence on the bed porosity. Since it has been observed that increased moisture content of the sample (porosity value of 0.68) caused a decrease in permeability, a functional dependence of the sample moisture content on the porosity has been established. The dependence established is valid for the range of the sample moisture content between 0.0948 and 0.6394. Permeability coefficients, as well as their dependencies on the relevant factors (porosity and moisture content), represent basic data used in mathematical modeling of biomass bale combustion in cigar burners. In addition, the ones may also be very important when considering modifications of furnaces utilizing the combustion principle mentioned.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Heat and Mass Transfer
T1  - Experimental method for determining Forchheimer equation coefficients related to flow of air through the bales of soy straw
EP  - 4306
IS  - 19-20
SP  - 4300
VL  - 54
DO  - 10.1016/j.ijheatmasstransfer.2011.05.015
ER  - 

@article{
author = "Erić, Aleksandar and Dakić, Dragoljub and Nemoda, Stevan and Komatina, Mirko and Repić, Branislav",
year = "2011",
abstract = "The paper presents results of experimental investigation conducted to determine permeability coefficient of a porous bed formed by biomass bales, whereby the said coefficient represents one of the most important parameters of the bed material specified when considering its combustion in the pusher-type furnaces (i.e. combustion of biomass bales in cigar burners). Correlations obtained are deemed very important for optimization of biomass bale combustion, as well as for modeling transport phenomena occurring in the porous bed formed by biomass bales during their combustion in cigar burners. In order to determine permeability coefficient of air flow through soy straw bales, appropriate experimental method was developed and suitable experimental apparatus designed and constructed. The relevant coefficients were determined in such manner as to be representative of the viscous and inertial terms of the Forchheimer equation. Experimental investigation conducted examined the effects of relevant biomass bale parameters i.e. porosity and the moisture content on the abovementioned Forchheimer coefficients. Measurements conducted, as well as analysis of the results obtained, defined functional dependencies of the permeability coefficients on the porosity (which was varied in the range 0.62-0.78, for moisture content of 0.0948) and the sample's moisture content (which was varied in the range 0.0948-0.6394, for the selected value of porosity of 0.68) to be established. The correlations obtained are deemed suitable to be used in a broad spectrum of operating conditions that usually occur during real operation. Results obtained indicate that reduction in biomass bed porosity results in reduced permeability, with Forchheimer coefficients exhibiting a hyperbolic dependence on the bed porosity. Since it has been observed that increased moisture content of the sample (porosity value of 0.68) caused a decrease in permeability, a functional dependence of the sample moisture content on the porosity has been established. The dependence established is valid for the range of the sample moisture content between 0.0948 and 0.6394. Permeability coefficients, as well as their dependencies on the relevant factors (porosity and moisture content), represent basic data used in mathematical modeling of biomass bale combustion in cigar burners. In addition, the ones may also be very important when considering modifications of furnaces utilizing the combustion principle mentioned.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Heat and Mass Transfer",
title = "Experimental method for determining Forchheimer equation coefficients related to flow of air through the bales of soy straw",
pages = "4306-4300",
number = "19-20",
volume = "54",
doi = "10.1016/j.ijheatmasstransfer.2011.05.015"
}

Erić, A., Dakić, D., Nemoda, S., Komatina, M.,& Repić, B.. (2011). Experimental method for determining Forchheimer equation coefficients related to flow of air through the bales of soy straw. in International Journal of Heat and Mass Transfer
Pergamon-Elsevier Science Ltd, Oxford., 54(19-20), 4300-4306.
https://doi.org/10.1016/j.ijheatmasstransfer.2011.05.015

Erić A, Dakić D, Nemoda S, Komatina M, Repić B. Experimental method for determining Forchheimer equation coefficients related to flow of air through the bales of soy straw. in International Journal of Heat and Mass Transfer. 2011;54(19-20):4300-4306.
doi:10.1016/j.ijheatmasstransfer.2011.05.015 .

Erić, Aleksandar, Dakić, Dragoljub, Nemoda, Stevan, Komatina, Mirko, Repić, Branislav, "Experimental method for determining Forchheimer equation coefficients related to flow of air through the bales of soy straw" in International Journal of Heat and Mass Transfer, 54, no. 19-20 (2011):4300-4306,
https://doi.org/10.1016/j.ijheatmasstransfer.2011.05.015 . .

TY  - JOUR
AU  - Mladenović, Milica R.
AU  - Nemoda, Stevan
AU  - Dakić, Dragoljub
AU  - Repić, Branislav
AU  - Erić, Aleksandar M.
AU  - Đurović, Dejan M.
AU  - Komatina, Mirko
PY  - 2010
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1068
AB  - Ovaj rad predstavlja doprinos ispitivanju sagorevanja alternativnih tečnih goriva poput: taloga iz rezervoara sirove nafte, zatim tečnih materija nastalih kao nusproizvod u procesima procesne, petrohemijske i metalurške industrije, iskorišćenih jestivih i mineralnih ulja, ili glicerina - nusprodukta proizvodnje biodizela. Ove materije se najčešće tretiraju kao otpadne ili istrošene materije i njihovo odlaganje/uklanjanje je najčešće skopčano sa velikim ekološkim problemima. Pored toga, te materije se zbog velikog sadržaja balasta, neujednačenog sastava i gustine ne mogu sagorevati u uobičajenim uređajima za sagorevanje tečnih goriva, pa se kao rešenje nameće tehnologija termičke dezintegracije u fluidizovanom sloju, koji omogućava sagorevanje materija najrazličitijeg porekla i neujednačenog sastava, uz smanjenje emisije polutanata i veliku termičku inertnost postrojenja. U radu je dat opis eksperimentalne instalacije za sagorevanje tečnih goriva velikih gustina u fluidizovanom sloju, kao i prikaz eksperimentalnih rezultata sagorevanja nekoliko tipova tečnih goriva sa i bez nečistoća, različitih gustina i viskoziteta, sa i bez dodavanja vode, u dugotrajnim, stacionarnim režimima. Prilikom analize eksperimenata akcenat je postavljen na efikasnost i stabilnost sagorevanja goriva različitog sastava. Razmatran je sadržaj štetnih produkata sagorevanja, uz analizu rasporeda temperatura u ložištu radi određivanja lokacije zone intenzivnog sagorevanja u zavisnosti od karakteristika goriva.
AB  - This paper is a contribution to the investigation of combustion of alternative liquid fuels, such as: the sediment from crude-fuel oil tanks; liquid substances - by-products of processes in process, petrochemical and metallurgical industries; used edible and mineral oils; or glycerin - by-product of biodiesel production. These substances are most commonly treated as waste or used matter, and their disposal/removal is most often linked to considerable environmental problems. In addition to this, these substances, due to high content of ballast matter, non-uniform composition and density, can not be burnt in conventional liquid fuel combustors, hence the technology of thermal disintegration in the fluidized bed imposes as a solution, which enables the combustion of fuels of most distinct types and non-uniform compositions, together with diminishing pollutant emissions and high thermal inertia of the facility. In the paper, a description of the experimental set-up for the combustion of high density liquid fuels in the fluidized bed is given, as well as experimental results obtained by combustion of several liquid fuel types, with or without impurities, with different densities and viscosities, with or without adding water, in long-term, steady regimes. During the analysis of the experiments, the focus was set on the combustion efficiency and stability, for fuels of various compositions. The content of harmful combustion products has been considered, as well as the analysis of furnace temperature distribution, in order to determine the location of the intensive combustion zone as a function of fuel properties.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd i Društvo termičara Srbije, Beograd
T2  - Termotehnika
T1  - Eksperimenti sagorevanja različitih tečnih goriva u ložištu sa fluidizovanim slojem
T1  - The experiments of fluidized bed combustion of diversely liquid fuel
EP  - 142
IS  - 1
SP  - 133
VL  - 36
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1068
ER  - 

@article{
author = "Mladenović, Milica R. and Nemoda, Stevan and Dakić, Dragoljub and Repić, Branislav and Erić, Aleksandar M. and Đurović, Dejan M. and Komatina, Mirko",
year = "2010",
abstract = "Ovaj rad predstavlja doprinos ispitivanju sagorevanja alternativnih tečnih goriva poput: taloga iz rezervoara sirove nafte, zatim tečnih materija nastalih kao nusproizvod u procesima procesne, petrohemijske i metalurške industrije, iskorišćenih jestivih i mineralnih ulja, ili glicerina - nusprodukta proizvodnje biodizela. Ove materije se najčešće tretiraju kao otpadne ili istrošene materije i njihovo odlaganje/uklanjanje je najčešće skopčano sa velikim ekološkim problemima. Pored toga, te materije se zbog velikog sadržaja balasta, neujednačenog sastava i gustine ne mogu sagorevati u uobičajenim uređajima za sagorevanje tečnih goriva, pa se kao rešenje nameće tehnologija termičke dezintegracije u fluidizovanom sloju, koji omogućava sagorevanje materija najrazličitijeg porekla i neujednačenog sastava, uz smanjenje emisije polutanata i veliku termičku inertnost postrojenja. U radu je dat opis eksperimentalne instalacije za sagorevanje tečnih goriva velikih gustina u fluidizovanom sloju, kao i prikaz eksperimentalnih rezultata sagorevanja nekoliko tipova tečnih goriva sa i bez nečistoća, različitih gustina i viskoziteta, sa i bez dodavanja vode, u dugotrajnim, stacionarnim režimima. Prilikom analize eksperimenata akcenat je postavljen na efikasnost i stabilnost sagorevanja goriva različitog sastava. Razmatran je sadržaj štetnih produkata sagorevanja, uz analizu rasporeda temperatura u ložištu radi određivanja lokacije zone intenzivnog sagorevanja u zavisnosti od karakteristika goriva., This paper is a contribution to the investigation of combustion of alternative liquid fuels, such as: the sediment from crude-fuel oil tanks; liquid substances - by-products of processes in process, petrochemical and metallurgical industries; used edible and mineral oils; or glycerin - by-product of biodiesel production. These substances are most commonly treated as waste or used matter, and their disposal/removal is most often linked to considerable environmental problems. In addition to this, these substances, due to high content of ballast matter, non-uniform composition and density, can not be burnt in conventional liquid fuel combustors, hence the technology of thermal disintegration in the fluidized bed imposes as a solution, which enables the combustion of fuels of most distinct types and non-uniform compositions, together with diminishing pollutant emissions and high thermal inertia of the facility. In the paper, a description of the experimental set-up for the combustion of high density liquid fuels in the fluidized bed is given, as well as experimental results obtained by combustion of several liquid fuel types, with or without impurities, with different densities and viscosities, with or without adding water, in long-term, steady regimes. During the analysis of the experiments, the focus was set on the combustion efficiency and stability, for fuels of various compositions. The content of harmful combustion products has been considered, as well as the analysis of furnace temperature distribution, in order to determine the location of the intensive combustion zone as a function of fuel properties.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd i Društvo termičara Srbije, Beograd",
journal = "Termotehnika",
title = "Eksperimenti sagorevanja različitih tečnih goriva u ložištu sa fluidizovanim slojem, The experiments of fluidized bed combustion of diversely liquid fuel",
pages = "142-133",
number = "1",
volume = "36",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1068"
}

Mladenović, M. R., Nemoda, S., Dakić, D., Repić, B., Erić, A. M., Đurović, D. M.,& Komatina, M.. (2010). Eksperimenti sagorevanja različitih tečnih goriva u ložištu sa fluidizovanim slojem. in Termotehnika
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd i Društvo termičara Srbije, Beograd., 36(1), 133-142.
https://hdl.handle.net/21.15107/rcub_machinery_1068

Mladenović MR, Nemoda S, Dakić D, Repić B, Erić AM, Đurović DM, Komatina M. Eksperimenti sagorevanja različitih tečnih goriva u ložištu sa fluidizovanim slojem. in Termotehnika. 2010;36(1):133-142.
https://hdl.handle.net/21.15107/rcub_machinery_1068 .

Mladenović, Milica R., Nemoda, Stevan, Dakić, Dragoljub, Repić, Branislav, Erić, Aleksandar M., Đurović, Dejan M., Komatina, Mirko, "Eksperimenti sagorevanja različitih tečnih goriva u ložištu sa fluidizovanim slojem" in Termotehnika, 36, no. 1 (2010):133-142,
https://hdl.handle.net/21.15107/rcub_machinery_1068 .

TY  - JOUR
AU  - Živković, Goran
AU  - Mirkov, Nikola
AU  - Dakić, Dragoljub
AU  - Mladenović, Milica R.
AU  - Erić, Aleksandar M.
AU  - Erić, Milić D.
AU  - Rudonja, Nedžad
PY  - 2010
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1033
AB  - Za potrebe zagrevanja 1 ha plastenika na poljoprivrednom dobru u Padinskoj Skeli, koje se nalazi u okviru PKB korporacije, izgrađen je grejni sistem sa kotlom na biomasu, u kome se toplota dobija sagorevanjem balirane sojine slame. Zbog nestacionarnih efekata zagrevanja pojavila se potreba za uključivanjem akumulatora toplote u sistem grejanja. Ovaj rad ima za cilj numeričku i eksperimentalnu studiju izvršenu sa ciljem optimizacije akumulatora toplote u predmetnom grejnom sistemu, kao i optimizaciju celokupnog grejnog sistema. U akumulatoru toplote kapaciteta 100 m3, u kome se skladišti zagrejana voda, izvršena su merenja u 256 tačaka, kako u stacionarnom tako i u nestacionarnom režimu rada kotla. Analiza optimizacije je izvršena numeričkom simulacijom koja je obuhvatala i stacionarne i nestacionarne režime. Dobijeni rezultati pokazuju dobro poklapanje rezultata dobijenih eksperimentom i numeričkom simulacijom.
AB  - A 1.5 MW combustion facility burning large bales of soy straw has been built for the purpose of heating 1 ha of vegetable greenhouses located within the complex of Agricultural Plant PKB in Padinska Skela, Serbia. The paper addresses numerical and experimental study of temperature distribution in a cylindrical, 100 m3 (8 m high, 4 m in diameter) hot water storage tank. The water tank optimization, as well as optimization of the heating facility as a whole, were identified as the main goals of the study performed. Water temperature was measured by a temperature probe inserted in the tank. Measurements were conducted in 256 measurement points, both under steady and unsteady water flow conditions. Water tank optimization analysis was carried out utilizing both steady and unsteady state numerical simulation. The results obtained indicated good agreement between the experimental and computational data acquired.
PB  - Univerzitet u Beogradu - Mašinski fakultet, Beograd
T2  - FME Transactions
T1  - Modeliranje strujno-termičkih procesa i optimizacija rada akumulatora toplote u grejnim sistemima sa toplovodnim kotlom na biomasu
T1  - Numerical simulation of thermo-fluid properties and optimization of hot water storage tank in biomass heating systems
EP  - 70
IS  - 2
SP  - 63
VL  - 38
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1033
ER  - 

@article{
author = "Živković, Goran and Mirkov, Nikola and Dakić, Dragoljub and Mladenović, Milica R. and Erić, Aleksandar M. and Erić, Milić D. and Rudonja, Nedžad",
year = "2010",
abstract = "Za potrebe zagrevanja 1 ha plastenika na poljoprivrednom dobru u Padinskoj Skeli, koje se nalazi u okviru PKB korporacije, izgrađen je grejni sistem sa kotlom na biomasu, u kome se toplota dobija sagorevanjem balirane sojine slame. Zbog nestacionarnih efekata zagrevanja pojavila se potreba za uključivanjem akumulatora toplote u sistem grejanja. Ovaj rad ima za cilj numeričku i eksperimentalnu studiju izvršenu sa ciljem optimizacije akumulatora toplote u predmetnom grejnom sistemu, kao i optimizaciju celokupnog grejnog sistema. U akumulatoru toplote kapaciteta 100 m3, u kome se skladišti zagrejana voda, izvršena su merenja u 256 tačaka, kako u stacionarnom tako i u nestacionarnom režimu rada kotla. Analiza optimizacije je izvršena numeričkom simulacijom koja je obuhvatala i stacionarne i nestacionarne režime. Dobijeni rezultati pokazuju dobro poklapanje rezultata dobijenih eksperimentom i numeričkom simulacijom., A 1.5 MW combustion facility burning large bales of soy straw has been built for the purpose of heating 1 ha of vegetable greenhouses located within the complex of Agricultural Plant PKB in Padinska Skela, Serbia. The paper addresses numerical and experimental study of temperature distribution in a cylindrical, 100 m3 (8 m high, 4 m in diameter) hot water storage tank. The water tank optimization, as well as optimization of the heating facility as a whole, were identified as the main goals of the study performed. Water temperature was measured by a temperature probe inserted in the tank. Measurements were conducted in 256 measurement points, both under steady and unsteady water flow conditions. Water tank optimization analysis was carried out utilizing both steady and unsteady state numerical simulation. The results obtained indicated good agreement between the experimental and computational data acquired.",
publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd",
journal = "FME Transactions",
title = "Modeliranje strujno-termičkih procesa i optimizacija rada akumulatora toplote u grejnim sistemima sa toplovodnim kotlom na biomasu, Numerical simulation of thermo-fluid properties and optimization of hot water storage tank in biomass heating systems",
pages = "70-63",
number = "2",
volume = "38",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1033"
}

Živković, G., Mirkov, N., Dakić, D., Mladenović, M. R., Erić, A. M., Erić, M. D.,& Rudonja, N.. (2010). Modeliranje strujno-termičkih procesa i optimizacija rada akumulatora toplote u grejnim sistemima sa toplovodnim kotlom na biomasu. in FME Transactions
Univerzitet u Beogradu - Mašinski fakultet, Beograd., 38(2), 63-70.
https://hdl.handle.net/21.15107/rcub_machinery_1033

Živković G, Mirkov N, Dakić D, Mladenović MR, Erić AM, Erić MD, Rudonja N. Modeliranje strujno-termičkih procesa i optimizacija rada akumulatora toplote u grejnim sistemima sa toplovodnim kotlom na biomasu. in FME Transactions. 2010;38(2):63-70.
https://hdl.handle.net/21.15107/rcub_machinery_1033 .

Živković, Goran, Mirkov, Nikola, Dakić, Dragoljub, Mladenović, Milica R., Erić, Aleksandar M., Erić, Milić D., Rudonja, Nedžad, "Modeliranje strujno-termičkih procesa i optimizacija rada akumulatora toplote u grejnim sistemima sa toplovodnim kotlom na biomasu" in FME Transactions, 38, no. 2 (2010):63-70,
https://hdl.handle.net/21.15107/rcub_machinery_1033 .

TY  - JOUR
AU  - Erić, Aleksandar M.
AU  - Dakić, Dragoljub
AU  - Nemoda, Stevan
AU  - Komatina, Mirko
AU  - Đurović, Dejan M.
AU  - Stojanović, Andrijana
PY  - 2010
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1048
AB  - Biomasa kao najznačajniji obnovljivi izvor energije kod nas, ima značajne prednosti sa aspekta očuvanja životne sredine, jer se njenim korišćenjem ne povećava koncentracija ugljendioksida u atmosferi, što se u potpunosti uklapa u tendencije zemalja potpisnica Kjoto sporazuma, među kojima je i Republika Srbija. U skladu s tim, grupa saradnika Laboratorije za termotehniku i energetiku Instituta za nuklearne nauke 'Vinča', niz godina unazad značajno radi na promovisanju korišćenja otpadne poljoprivredne biomase, što je finalizovano razvojem kotla snage 1,5 MW za sagorevanje baliranog sojinog ostatka za potrebe grejanja 1 hektara plastenika u okviru Poljoprivrednog kombinata Beograd. Za potrebe definisanja termofizičkih karakteristika goriva (bali- ranog sojinog ostatka) koje su od posebnog značaja za sveobuhvatnije sagledavanje i predviđanje procesa sagorevanja, u ovom radu je prikazano eksperimentalno određivanje koeficijenata permeabilnosti. Koeficijenti su određivani tako da odgovaraju viskoznim i inercionim članovima uopštene Forhajmerove jednačine. Eksperimentalnim istraživanjima je obuhvaćen uticaj poroznosti na permeabilnost, a kao rezultat analize eksperimentalnih podataka, definisane su i funkcionalne zavisnosti pomenutih koeficijenata od poroznosti. Pored toga, u radu je razmatran i uticaj vlažnosti biomase na permeabilnost, kao i funkcionalna zavisnost vlažnosti i poroznosti. Određivanje parametara permeabilnosti, kao i njihove zavisnosti od uticajnih faktora (poroznost i vlažnost), polazne su osnove u daljem istraživanju kinetike procesa sagorevanja u realnim uslovima, što je veoma značajno pri definisanju geometrijskih karakteristika ložišta.
AB  - Biomass as the most important renewable energy source in our country has also significant advantages from the aspect of environment protection. The later is because its use does not increase the concentration of carbon dioxide in the atmosphere, what is completely in accordance with the tendencies of the signatory countries of the Kyoto Agreement, including the Republic of Serbia. Accordingly, a group of associates of the Laboratory for Thermal Engineering and Energy of the Vinča Institute of Nuclear Sciences, Belgrade, a large number of years has invested huge efforts into promoting the use of agricultural waste biomass. These efforts finished with the development of 1.5 MW power boiler combustion balled soybean residue for 1 ha heating greenhouses in the Agricultural complex Belgrade. For purposes of defining the thermophysical properties of fuel (balled soybean residue), which are of great importance for the comprehensive understanding and prediction of the combustion process, this work has been shown experimental determination of the permeability coefficients in Forchheimer's equation which presents the pressure drop through porous media. Coefficients were determined to match the viscous and inertia terms of the general Forchheimer's equation. Experimental research include influence of porosity on permeability analysis, and accordingly, the semi-empirical dependence of these coefficients of porosity has been given. In addition, the paper also has discussed the influence of humidity on the permeability of biomass, and the dependence on moisture and porosity, as well. The determination of permeability parameters, and their dependence of the relevant factors (porosity and humidity), is the starting base for the further study of the combustion process kinetics under real conditions, what is very important for the defining combustion chamber construction features.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd i Društvo termičara Srbije, Beograd
T2  - Termotehnika
T1  - Eksperimentalno određivanje permeabilnosti baliranog sojinog ostatka
T1  - Experimental determination of the balled soya residue permeability
EP  - 151
IS  - 1
SP  - 143
VL  - 36
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1048
ER  - 

@article{
author = "Erić, Aleksandar M. and Dakić, Dragoljub and Nemoda, Stevan and Komatina, Mirko and Đurović, Dejan M. and Stojanović, Andrijana",
year = "2010",
abstract = "Biomasa kao najznačajniji obnovljivi izvor energije kod nas, ima značajne prednosti sa aspekta očuvanja životne sredine, jer se njenim korišćenjem ne povećava koncentracija ugljendioksida u atmosferi, što se u potpunosti uklapa u tendencije zemalja potpisnica Kjoto sporazuma, među kojima je i Republika Srbija. U skladu s tim, grupa saradnika Laboratorije za termotehniku i energetiku Instituta za nuklearne nauke 'Vinča', niz godina unazad značajno radi na promovisanju korišćenja otpadne poljoprivredne biomase, što je finalizovano razvojem kotla snage 1,5 MW za sagorevanje baliranog sojinog ostatka za potrebe grejanja 1 hektara plastenika u okviru Poljoprivrednog kombinata Beograd. Za potrebe definisanja termofizičkih karakteristika goriva (bali- ranog sojinog ostatka) koje su od posebnog značaja za sveobuhvatnije sagledavanje i predviđanje procesa sagorevanja, u ovom radu je prikazano eksperimentalno određivanje koeficijenata permeabilnosti. Koeficijenti su određivani tako da odgovaraju viskoznim i inercionim članovima uopštene Forhajmerove jednačine. Eksperimentalnim istraživanjima je obuhvaćen uticaj poroznosti na permeabilnost, a kao rezultat analize eksperimentalnih podataka, definisane su i funkcionalne zavisnosti pomenutih koeficijenata od poroznosti. Pored toga, u radu je razmatran i uticaj vlažnosti biomase na permeabilnost, kao i funkcionalna zavisnost vlažnosti i poroznosti. Određivanje parametara permeabilnosti, kao i njihove zavisnosti od uticajnih faktora (poroznost i vlažnost), polazne su osnove u daljem istraživanju kinetike procesa sagorevanja u realnim uslovima, što je veoma značajno pri definisanju geometrijskih karakteristika ložišta., Biomass as the most important renewable energy source in our country has also significant advantages from the aspect of environment protection. The later is because its use does not increase the concentration of carbon dioxide in the atmosphere, what is completely in accordance with the tendencies of the signatory countries of the Kyoto Agreement, including the Republic of Serbia. Accordingly, a group of associates of the Laboratory for Thermal Engineering and Energy of the Vinča Institute of Nuclear Sciences, Belgrade, a large number of years has invested huge efforts into promoting the use of agricultural waste biomass. These efforts finished with the development of 1.5 MW power boiler combustion balled soybean residue for 1 ha heating greenhouses in the Agricultural complex Belgrade. For purposes of defining the thermophysical properties of fuel (balled soybean residue), which are of great importance for the comprehensive understanding and prediction of the combustion process, this work has been shown experimental determination of the permeability coefficients in Forchheimer's equation which presents the pressure drop through porous media. Coefficients were determined to match the viscous and inertia terms of the general Forchheimer's equation. Experimental research include influence of porosity on permeability analysis, and accordingly, the semi-empirical dependence of these coefficients of porosity has been given. In addition, the paper also has discussed the influence of humidity on the permeability of biomass, and the dependence on moisture and porosity, as well. The determination of permeability parameters, and their dependence of the relevant factors (porosity and humidity), is the starting base for the further study of the combustion process kinetics under real conditions, what is very important for the defining combustion chamber construction features.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd i Društvo termičara Srbije, Beograd",
journal = "Termotehnika",
title = "Eksperimentalno određivanje permeabilnosti baliranog sojinog ostatka, Experimental determination of the balled soya residue permeability",
pages = "151-143",
number = "1",
volume = "36",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1048"
}

Erić, A. M., Dakić, D., Nemoda, S., Komatina, M., Đurović, D. M.,& Stojanović, A.. (2010). Eksperimentalno određivanje permeabilnosti baliranog sojinog ostatka. in Termotehnika
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd i Društvo termičara Srbije, Beograd., 36(1), 143-151.
https://hdl.handle.net/21.15107/rcub_machinery_1048

Erić AM, Dakić D, Nemoda S, Komatina M, Đurović DM, Stojanović A. Eksperimentalno određivanje permeabilnosti baliranog sojinog ostatka. in Termotehnika. 2010;36(1):143-151.
https://hdl.handle.net/21.15107/rcub_machinery_1048 .

Erić, Aleksandar M., Dakić, Dragoljub, Nemoda, Stevan, Komatina, Mirko, Đurović, Dejan M., Stojanović, Andrijana, "Eksperimentalno određivanje permeabilnosti baliranog sojinog ostatka" in Termotehnika, 36, no. 1 (2010):143-151,
https://hdl.handle.net/21.15107/rcub_machinery_1048 .

TY  - JOUR
AU  - Erić, Aleksandar
AU  - Dakić, Dragoljub
AU  - Nemoda, Stevan
AU  - Komatina, Mirko
AU  - Repić, Branislav
PY  - 2010
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1074
AB  - U ovom radu prikazani su rezultati eksperimentalnih istraživanja određivanja stagnatne toplotne provodljivosti poroznog sloja balirane biomase, koja predstavlja jednu od najvažnijih termofizičkih karakteristika ovog materijala sa tačke gledišta sagorevanja u potisnim ložištima (sa tzv. cigaretnim sagorevanjem). Dobijena zavisnost značajna je za optimalizaciju procesa sagorevanja balirane biomase, kao i za proces modeliranja transportnih fenomena u poroznom sloju balirane biomase, pri tzv. cigaretnom sagorevanju. Radi određivanja stagnatne toplotne provodljivosti balirane sojine slame, osmišljena je odgovarajuća eksperimenatlna metoda i projektovana i izrađena odgovarajuća eksperimentalna instalacija. Eksperimentalnim istraživanjima ispitivan je uticaj, relevantnog parametra balirane biomase (poroznosti sloja) na stagnatnu toplotnu provodljivost. Na osnovu sprovedenih merenja, kao i analize eksperimentalnih rezultata, definisana je funkcionalna zavisnost stagnatne toplotne provodljivosti od poroznosti u opsegu od 0,45-0,8. Dobijeni rezultati pokazuju da smanjenjem poroznosti sloja dolazi do smanjenja vrednosti stagnatne toplotne provodljivosti, što može da se objasni smanjenjem zapremina pora, odnosno vazduha, koji aktivno učestvuje u procesu prenošenja toplote kroz porozni sloj. Stagnatna toplotna provodljivost, kao i njena zavisnost poroznosti, polazne su osnove u matematičkom modeliranju procesa sagorevanja balirane biomase po principu cigarete, a takođe mogu biti veoma značajni pri analizi eventualnih konstrukcionih izmena na ložištu, koje radi na ovom principu.
AB  - The paper presents results of experimental determination of the stagnant thermal conductivity coefficient of a porous bed formed by biomass bales. The said coefficient represents one of the most important parameters of the bed material specified when considering its combustion in the pusher-type furnaces (i.e. combustion of biomass bales in cigar burners). Correlation obtained is deemed very important for optimization of biomass bale combustion, as well as for modelling transport phenomena occurring in the porous bed formed by biomass bales during their combustion in cigar burners. In order to determine stagnant thermal conductivity coefficient of soy bean straw bales, appropriate experimental method and suitable experimental apparatus were designed and constructed. Experimental investigation was conducted in order to study the effects of relevant biomass bale parameter, i.e. porosity on the stagnant thermal conductivity coefficient. Based on analysis of the said measurement, the results of the functional dependencies of the stagnant thermal conductivity coefficient on the porosity, which was varied in the range 0.6 - 0.8, were defined. Performed experiments have shown that the stagnant thermal conductivity of baled straw decreases with decreasing porosity of the sample, which can be explained by reduction of the closed pores volume, and, accordingly, fluid within them has reduced ability of circulation which causes reduced intensity of heat transfer between the pore walls. The data obtained through investigation are deemed very useful in developing a detailed CFD model for combustion of straw bales in cigar burners.
PB  - Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad
T2  - Savremena poljoprivredna tehnika
T1  - Određivanje stagnantne toplotne provodljivosti baliranog sojinog ostatka
T1  - Determination of stagnant thermal conductivity coefficient for baled soy bean residue
EP  - 343
IS  - 4
SP  - 334
VL  - 36
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1074
ER  - 

@article{
author = "Erić, Aleksandar and Dakić, Dragoljub and Nemoda, Stevan and Komatina, Mirko and Repić, Branislav",
year = "2010",
abstract = "U ovom radu prikazani su rezultati eksperimentalnih istraživanja određivanja stagnatne toplotne provodljivosti poroznog sloja balirane biomase, koja predstavlja jednu od najvažnijih termofizičkih karakteristika ovog materijala sa tačke gledišta sagorevanja u potisnim ložištima (sa tzv. cigaretnim sagorevanjem). Dobijena zavisnost značajna je za optimalizaciju procesa sagorevanja balirane biomase, kao i za proces modeliranja transportnih fenomena u poroznom sloju balirane biomase, pri tzv. cigaretnom sagorevanju. Radi određivanja stagnatne toplotne provodljivosti balirane sojine slame, osmišljena je odgovarajuća eksperimenatlna metoda i projektovana i izrađena odgovarajuća eksperimentalna instalacija. Eksperimentalnim istraživanjima ispitivan je uticaj, relevantnog parametra balirane biomase (poroznosti sloja) na stagnatnu toplotnu provodljivost. Na osnovu sprovedenih merenja, kao i analize eksperimentalnih rezultata, definisana je funkcionalna zavisnost stagnatne toplotne provodljivosti od poroznosti u opsegu od 0,45-0,8. Dobijeni rezultati pokazuju da smanjenjem poroznosti sloja dolazi do smanjenja vrednosti stagnatne toplotne provodljivosti, što može da se objasni smanjenjem zapremina pora, odnosno vazduha, koji aktivno učestvuje u procesu prenošenja toplote kroz porozni sloj. Stagnatna toplotna provodljivost, kao i njena zavisnost poroznosti, polazne su osnove u matematičkom modeliranju procesa sagorevanja balirane biomase po principu cigarete, a takođe mogu biti veoma značajni pri analizi eventualnih konstrukcionih izmena na ložištu, koje radi na ovom principu., The paper presents results of experimental determination of the stagnant thermal conductivity coefficient of a porous bed formed by biomass bales. The said coefficient represents one of the most important parameters of the bed material specified when considering its combustion in the pusher-type furnaces (i.e. combustion of biomass bales in cigar burners). Correlation obtained is deemed very important for optimization of biomass bale combustion, as well as for modelling transport phenomena occurring in the porous bed formed by biomass bales during their combustion in cigar burners. In order to determine stagnant thermal conductivity coefficient of soy bean straw bales, appropriate experimental method and suitable experimental apparatus were designed and constructed. Experimental investigation was conducted in order to study the effects of relevant biomass bale parameter, i.e. porosity on the stagnant thermal conductivity coefficient. Based on analysis of the said measurement, the results of the functional dependencies of the stagnant thermal conductivity coefficient on the porosity, which was varied in the range 0.6 - 0.8, were defined. Performed experiments have shown that the stagnant thermal conductivity of baled straw decreases with decreasing porosity of the sample, which can be explained by reduction of the closed pores volume, and, accordingly, fluid within them has reduced ability of circulation which causes reduced intensity of heat transfer between the pore walls. The data obtained through investigation are deemed very useful in developing a detailed CFD model for combustion of straw bales in cigar burners.",
publisher = "Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad",
journal = "Savremena poljoprivredna tehnika",
title = "Određivanje stagnantne toplotne provodljivosti baliranog sojinog ostatka, Determination of stagnant thermal conductivity coefficient for baled soy bean residue",
pages = "343-334",
number = "4",
volume = "36",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1074"
}

Erić, A., Dakić, D., Nemoda, S., Komatina, M.,& Repić, B.. (2010). Određivanje stagnantne toplotne provodljivosti baliranog sojinog ostatka. in Savremena poljoprivredna tehnika
Nacionalno naučno društvo za poljoprivrednu tehniku, Novi Sad., 36(4), 334-343.
https://hdl.handle.net/21.15107/rcub_machinery_1074

Erić A, Dakić D, Nemoda S, Komatina M, Repić B. Određivanje stagnantne toplotne provodljivosti baliranog sojinog ostatka. in Savremena poljoprivredna tehnika. 2010;36(4):334-343.
https://hdl.handle.net/21.15107/rcub_machinery_1074 .

Erić, Aleksandar, Dakić, Dragoljub, Nemoda, Stevan, Komatina, Mirko, Repić, Branislav, "Određivanje stagnantne toplotne provodljivosti baliranog sojinog ostatka" in Savremena poljoprivredna tehnika, 36, no. 4 (2010):334-343,
https://hdl.handle.net/21.15107/rcub_machinery_1074 .

TY  - CONF
AU  - Paprika, Milijana J.
AU  - Komatina, Mirko
AU  - Dakić, Dragoljub
PY  - 2008
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/803
AB  - A theoretical study has been performed in order to investigate heat and mass transfer processes in a lignite particle during the devolatilization. A mathematical model, describing the devolatilization process, has included the internal and external heat transfer, primary decomposition reactions and mass transfer. The input of the numerical model has been: coal thermal properties, chemical kinetic parameters, particle diameter, volatile matter amount, and fluidized bed temperature. The output includes: the temperature, the amount of volatiles released, the rate of devolatilization, volatile matter flux, and the pressure inside the particle. The model enable closer insight of transfer processes within the lignite particle, devolatilizing in FB, and shows how the FB temperature and original size of coal reflect on the pressure profile of the lignite particle, devolatilizing in FB.
PB  - TuTech Innovation GmbH
C3  - CFB 2008 - Proceedings of the 9th Int. Conference on Circulating Fluidized Beds, in Conjunction with
T1  - The heat and mass transfer in a large lignite coal particle devolatilizing in FB
UR  - https://hdl.handle.net/21.15107/rcub_machinery_803
ER  - 

@conference{
author = "Paprika, Milijana J. and Komatina, Mirko and Dakić, Dragoljub",
year = "2008",
abstract = "A theoretical study has been performed in order to investigate heat and mass transfer processes in a lignite particle during the devolatilization. A mathematical model, describing the devolatilization process, has included the internal and external heat transfer, primary decomposition reactions and mass transfer. The input of the numerical model has been: coal thermal properties, chemical kinetic parameters, particle diameter, volatile matter amount, and fluidized bed temperature. The output includes: the temperature, the amount of volatiles released, the rate of devolatilization, volatile matter flux, and the pressure inside the particle. The model enable closer insight of transfer processes within the lignite particle, devolatilizing in FB, and shows how the FB temperature and original size of coal reflect on the pressure profile of the lignite particle, devolatilizing in FB.",
publisher = "TuTech Innovation GmbH",
journal = "CFB 2008 - Proceedings of the 9th Int. Conference on Circulating Fluidized Beds, in Conjunction with",
title = "The heat and mass transfer in a large lignite coal particle devolatilizing in FB",
url = "https://hdl.handle.net/21.15107/rcub_machinery_803"
}

Paprika, M. J., Komatina, M.,& Dakić, D.. (2008). The heat and mass transfer in a large lignite coal particle devolatilizing in FB. in CFB 2008 - Proceedings of the 9th Int. Conference on Circulating Fluidized Beds, in Conjunction with
TuTech Innovation GmbH..
https://hdl.handle.net/21.15107/rcub_machinery_803

Paprika MJ, Komatina M, Dakić D. The heat and mass transfer in a large lignite coal particle devolatilizing in FB. in CFB 2008 - Proceedings of the 9th Int. Conference on Circulating Fluidized Beds, in Conjunction with. 2008;.
https://hdl.handle.net/21.15107/rcub_machinery_803 .

Paprika, Milijana J., Komatina, Mirko, Dakić, Dragoljub, "The heat and mass transfer in a large lignite coal particle devolatilizing in FB" in CFB 2008 - Proceedings of the 9th Int. Conference on Circulating Fluidized Beds, in Conjunction with (2008),
https://hdl.handle.net/21.15107/rcub_machinery_803 .

TY  - JOUR
AU  - Mladenović, Rastko
AU  - Paprika, Milijana J.
AU  - Komatina, Mirko
AU  - Erić, Aleksandar
AU  - Mladenović, Milica
AU  - Dakić, Dragoljub
PY  - 2008
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/861
AB  - U jednoj od najvećih kompanija koje se bave poljoprivrednom proizvodnjom u Srbiji pod zasadom soje se nalazi preko 2000 ha, i svake godine se proizvede oko 4000 t balirane sojine slame. Planirano je da se sojina slama koristi za grejanje plastenika, ukupne površine 5 ha. Zbog toga, u Laboratoriji za termotehniku i energetiku Instituta za nuklearne nauke 'Vinča' je učinjen napor da se razvije tehnologija za korišćenje krupne balirane biomase za proizvodnju energije. U prvoj fazi, razvijeno je demonstraciono eksperimentalno postrojenje - ložište za sagorevanje bala sojine slame. Ložište je izgrađeno i termotehnički ispitano, da bi se utvrdio kvalitet sagorevanja. Kako su rezultati ispitivanja bili veoma zadovoljavajući, u drugoj fazi razvoja, vrelovodni kotao sličnih karakteristika (koji sagoreva bale sojine slame dimenzija 0,7 x 1,2 x 2,7 m) je projektovan, i trenutno je u fazi izgradnje.
AB  - In one of the largest agricultural companies in Serbia with over 2000 ha of soya plantations there is 4000 t/year of baled soya straw production. Soya straw biomass is planned to be used as renewable energy source for heating the greenhouses, with 5 ha in area. Therefore, efforts have been made to develop a technology for utilizing large bales of soya straw for energy production. In the first phase, a demo energy production facility - furnace was developed and built. The facility was tested in order to examine the quality of combustion of large soya straw bales. Since the experimental results obtained by testing of this facility proved to be very satisfactory in the second phase of development, the hot water boiler of similar characteristics (burning soya straw bales, with dimensions 0.7 x 1.2 x 2.7 m) was designed.
PB  - Univerzitet u Beogradu - Mašinski fakultet, Beograd
T2  - FME Transactions
T1  - Kotao za sagorevanje velikih bala sojine slame za grejanje plastenika
T1  - Boiler combusting large soya straw bales for heating the greenhouses complex
EP  - 32
IS  - 1
SP  - 27
VL  - 36
UR  - https://hdl.handle.net/21.15107/rcub_machinery_861
ER  - 

@article{
author = "Mladenović, Rastko and Paprika, Milijana J. and Komatina, Mirko and Erić, Aleksandar and Mladenović, Milica and Dakić, Dragoljub",
year = "2008",
abstract = "U jednoj od najvećih kompanija koje se bave poljoprivrednom proizvodnjom u Srbiji pod zasadom soje se nalazi preko 2000 ha, i svake godine se proizvede oko 4000 t balirane sojine slame. Planirano je da se sojina slama koristi za grejanje plastenika, ukupne površine 5 ha. Zbog toga, u Laboratoriji za termotehniku i energetiku Instituta za nuklearne nauke 'Vinča' je učinjen napor da se razvije tehnologija za korišćenje krupne balirane biomase za proizvodnju energije. U prvoj fazi, razvijeno je demonstraciono eksperimentalno postrojenje - ložište za sagorevanje bala sojine slame. Ložište je izgrađeno i termotehnički ispitano, da bi se utvrdio kvalitet sagorevanja. Kako su rezultati ispitivanja bili veoma zadovoljavajući, u drugoj fazi razvoja, vrelovodni kotao sličnih karakteristika (koji sagoreva bale sojine slame dimenzija 0,7 x 1,2 x 2,7 m) je projektovan, i trenutno je u fazi izgradnje., In one of the largest agricultural companies in Serbia with over 2000 ha of soya plantations there is 4000 t/year of baled soya straw production. Soya straw biomass is planned to be used as renewable energy source for heating the greenhouses, with 5 ha in area. Therefore, efforts have been made to develop a technology for utilizing large bales of soya straw for energy production. In the first phase, a demo energy production facility - furnace was developed and built. The facility was tested in order to examine the quality of combustion of large soya straw bales. Since the experimental results obtained by testing of this facility proved to be very satisfactory in the second phase of development, the hot water boiler of similar characteristics (burning soya straw bales, with dimensions 0.7 x 1.2 x 2.7 m) was designed.",
publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd",
journal = "FME Transactions",
title = "Kotao za sagorevanje velikih bala sojine slame za grejanje plastenika, Boiler combusting large soya straw bales for heating the greenhouses complex",
pages = "32-27",
number = "1",
volume = "36",
url = "https://hdl.handle.net/21.15107/rcub_machinery_861"
}

Mladenović, R., Paprika, M. J., Komatina, M., Erić, A., Mladenović, M.,& Dakić, D.. (2008). Kotao za sagorevanje velikih bala sojine slame za grejanje plastenika. in FME Transactions
Univerzitet u Beogradu - Mašinski fakultet, Beograd., 36(1), 27-32.
https://hdl.handle.net/21.15107/rcub_machinery_861

Mladenović R, Paprika MJ, Komatina M, Erić A, Mladenović M, Dakić D. Kotao za sagorevanje velikih bala sojine slame za grejanje plastenika. in FME Transactions. 2008;36(1):27-32.
https://hdl.handle.net/21.15107/rcub_machinery_861 .

Mladenović, Rastko, Paprika, Milijana J., Komatina, Mirko, Erić, Aleksandar, Mladenović, Milica, Dakić, Dragoljub, "Kotao za sagorevanje velikih bala sojine slame za grejanje plastenika" in FME Transactions, 36, no. 1 (2008):27-32,
https://hdl.handle.net/21.15107/rcub_machinery_861 .