TY  - JOUR
AU  - Karamarković, Rade M.
AU  - Karamarković, Vladan
AU  - Jovović, Aleksandar
AU  - Marašević, Miljan R.
AU  - Lazarević, Anđela D.
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1381
AB  - Due to the irreversibilities that occur during biomass gasification, gasifiers are usually the least efficient units in the systems for production of heat, electricity, or other biofuels. Internal thermal energy exchange is responsible for a part of these irreversibilities and can be reduced by the use of preheated air as a gasifying medium. The focus of the paper is biomass gasification in the whole range of gasification temperatures by the use of air preheated with product gas sensible heat. The energetic and exergetic analyses are carried with a typical ash-free biomass feed represented by CH1.4O0.59N0.0017 at 1 and 10 bar pressure. The tool for the analyses is already validated model extended with a heat exchanger model. For every 200 K of air preheating, the average decrease of the amount of air required for complete biomass gasification is 1.3% of the amount required for its stoichiometric combustion. The air preheated to the gasification temperature on the average increases the lower heating value of the product gas by 13.6%, as well as energetic and exergetic efficiencies of the process. The optimal air preheating temperature is the one that causes gasification to take place at the point where all carbon is consumed. It exists only if the amount of preheated air is less than the amount of air at ambient temperature required for complete gasification at a given pressure. Exergy losses in the heat exchanger, where the product gas preheats air could be reduced by two-stage preheating.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Biomass gasification with preheated air: Energy and exergy analysis
EP  - 550
IS  - 2
SP  - 535
VL  - 16
DO  - 10.2298/TSCI110708011K
ER  - 

@article{
author = "Karamarković, Rade M. and Karamarković, Vladan and Jovović, Aleksandar and Marašević, Miljan R. and Lazarević, Anđela D.",
year = "2012",
abstract = "Due to the irreversibilities that occur during biomass gasification, gasifiers are usually the least efficient units in the systems for production of heat, electricity, or other biofuels. Internal thermal energy exchange is responsible for a part of these irreversibilities and can be reduced by the use of preheated air as a gasifying medium. The focus of the paper is biomass gasification in the whole range of gasification temperatures by the use of air preheated with product gas sensible heat. The energetic and exergetic analyses are carried with a typical ash-free biomass feed represented by CH1.4O0.59N0.0017 at 1 and 10 bar pressure. The tool for the analyses is already validated model extended with a heat exchanger model. For every 200 K of air preheating, the average decrease of the amount of air required for complete biomass gasification is 1.3% of the amount required for its stoichiometric combustion. The air preheated to the gasification temperature on the average increases the lower heating value of the product gas by 13.6%, as well as energetic and exergetic efficiencies of the process. The optimal air preheating temperature is the one that causes gasification to take place at the point where all carbon is consumed. It exists only if the amount of preheated air is less than the amount of air at ambient temperature required for complete gasification at a given pressure. Exergy losses in the heat exchanger, where the product gas preheats air could be reduced by two-stage preheating.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Biomass gasification with preheated air: Energy and exergy analysis",
pages = "550-535",
number = "2",
volume = "16",
doi = "10.2298/TSCI110708011K"
}

Karamarković, R. M., Karamarković, V., Jovović, A., Marašević, M. R.,& Lazarević, A. D.. (2012). Biomass gasification with preheated air: Energy and exergy analysis. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 16(2), 535-550.
https://doi.org/10.2298/TSCI110708011K

Karamarković RM, Karamarković V, Jovović A, Marašević MR, Lazarević AD. Biomass gasification with preheated air: Energy and exergy analysis. in Thermal Science. 2012;16(2):535-550.
doi:10.2298/TSCI110708011K .

Karamarković, Rade M., Karamarković, Vladan, Jovović, Aleksandar, Marašević, Miljan R., Lazarević, Anđela D., "Biomass gasification with preheated air: Energy and exergy analysis" in Thermal Science, 16, no. 2 (2012):535-550,
https://doi.org/10.2298/TSCI110708011K . .

TY  - JOUR
AU  - Stevanović, Vladimir
AU  - Zivković, Branislav
AU  - Milivojević, Sanja
AU  - Maslovarić, Blaženka
AU  - Karamarković, Vladan
AU  - Trkulja, Vojin
PY  - 2009
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/986
AB  - A prediction of thermal transients in district heating systems is important in order to adjust in an energy efficient manner the loads of heat power plants and pump stations with dynamic consumption needs during changes of the outside air temperature, the wind intensity, the solar radiation, or system start-ups and shut-downs. A model and corresponding computer code are developed with the aim to simulate the thermal transients in district heating systems. They are based on the high-order accurate numerical solution of the transient energy equation, and the hydraulic prediction of pressure and fluid flow rates within the complex pipe network. Thermal transients caused by an increase and decrease of the heat power plant load are simulated for real operating conditions of the district heating system. Predicted temperature front propagations show a good agreement with data measured at three consumer substations located in different parts of the district heating network and at different distances from the heat plant. The developed computational tool provides reliable information about time periods of temperature fronts propagation and heat distribution from the heat source to consumers within the whole district heating network.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Energy Conversion and Management
T1  - Prediction of thermal transients in district heating systems
EP  - 2173
IS  - 9
SP  - 2167
VL  - 50
DO  - 10.1016/j.enconman.2009.04.034
ER  - 

@article{
author = "Stevanović, Vladimir and Zivković, Branislav and Milivojević, Sanja and Maslovarić, Blaženka and Karamarković, Vladan and Trkulja, Vojin",
year = "2009",
abstract = "A prediction of thermal transients in district heating systems is important in order to adjust in an energy efficient manner the loads of heat power plants and pump stations with dynamic consumption needs during changes of the outside air temperature, the wind intensity, the solar radiation, or system start-ups and shut-downs. A model and corresponding computer code are developed with the aim to simulate the thermal transients in district heating systems. They are based on the high-order accurate numerical solution of the transient energy equation, and the hydraulic prediction of pressure and fluid flow rates within the complex pipe network. Thermal transients caused by an increase and decrease of the heat power plant load are simulated for real operating conditions of the district heating system. Predicted temperature front propagations show a good agreement with data measured at three consumer substations located in different parts of the district heating network and at different distances from the heat plant. The developed computational tool provides reliable information about time periods of temperature fronts propagation and heat distribution from the heat source to consumers within the whole district heating network.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Energy Conversion and Management",
title = "Prediction of thermal transients in district heating systems",
pages = "2173-2167",
number = "9",
volume = "50",
doi = "10.1016/j.enconman.2009.04.034"
}

Stevanović, V., Zivković, B., Milivojević, S., Maslovarić, B., Karamarković, V.,& Trkulja, V.. (2009). Prediction of thermal transients in district heating systems. in Energy Conversion and Management
Pergamon-Elsevier Science Ltd, Oxford., 50(9), 2167-2173.
https://doi.org/10.1016/j.enconman.2009.04.034

Stevanović V, Zivković B, Milivojević S, Maslovarić B, Karamarković V, Trkulja V. Prediction of thermal transients in district heating systems. in Energy Conversion and Management. 2009;50(9):2167-2173.
doi:10.1016/j.enconman.2009.04.034 .

Stevanović, Vladimir, Zivković, Branislav, Milivojević, Sanja, Maslovarić, Blaženka, Karamarković, Vladan, Trkulja, Vojin, "Prediction of thermal transients in district heating systems" in Energy Conversion and Management, 50, no. 9 (2009):2167-2173,
https://doi.org/10.1016/j.enconman.2009.04.034 . .

TY  - JOUR
AU  - Stanojević, M.
AU  - Radić, Dejan
AU  - Jovović, Aleksandar
AU  - Pavlović, M.
AU  - Karamarković, Vladan
PY  - 2008
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/828
AB  - The efficiency of an air-slide pneumatic conveying system depends, first of all, on several basic elements chosen or calculated during the design of a plant: air-slide design parameters, air mover characteristics, as well as the physical and chemical properties of the material to be transported. However, during the exploitation of this type of system which is used for handling ash in thermal-power plants, either gradual and/or sudden changes in the operating conditions can arise. This may be due to changes both in the proportion of ash content, and in the flow characteristics of the porous membrane. The consequences of changes in these conditions on the performance of the ash handling system are analyzed, based upon the results of the experimental work carried out on the test rig at the Faculty of Mechanical Engineering in Belgrade, and upon the on-site measurements at the thermal-power plant "Nikola Tesla B".
PB  - Brazilian Soc Chemical Eng, Sao Paulo
T2  - Brazilian Journal of Chemical Engineering
T1  - The influence of variable operating conditions on the design and exploitation of fly ash pneumatic transport systems in thermal power plants
EP  - 797
IS  - 4
SP  - 789
VL  - 25
DO  - 10.1590/S0104-66322008000400016
ER  - 

@article{
author = "Stanojević, M. and Radić, Dejan and Jovović, Aleksandar and Pavlović, M. and Karamarković, Vladan",
year = "2008",
abstract = "The efficiency of an air-slide pneumatic conveying system depends, first of all, on several basic elements chosen or calculated during the design of a plant: air-slide design parameters, air mover characteristics, as well as the physical and chemical properties of the material to be transported. However, during the exploitation of this type of system which is used for handling ash in thermal-power plants, either gradual and/or sudden changes in the operating conditions can arise. This may be due to changes both in the proportion of ash content, and in the flow characteristics of the porous membrane. The consequences of changes in these conditions on the performance of the ash handling system are analyzed, based upon the results of the experimental work carried out on the test rig at the Faculty of Mechanical Engineering in Belgrade, and upon the on-site measurements at the thermal-power plant "Nikola Tesla B".",
publisher = "Brazilian Soc Chemical Eng, Sao Paulo",
journal = "Brazilian Journal of Chemical Engineering",
title = "The influence of variable operating conditions on the design and exploitation of fly ash pneumatic transport systems in thermal power plants",
pages = "797-789",
number = "4",
volume = "25",
doi = "10.1590/S0104-66322008000400016"
}

Stanojević, M., Radić, D., Jovović, A., Pavlović, M.,& Karamarković, V.. (2008). The influence of variable operating conditions on the design and exploitation of fly ash pneumatic transport systems in thermal power plants. in Brazilian Journal of Chemical Engineering
Brazilian Soc Chemical Eng, Sao Paulo., 25(4), 789-797.
https://doi.org/10.1590/S0104-66322008000400016

Stanojević M, Radić D, Jovović A, Pavlović M, Karamarković V. The influence of variable operating conditions on the design and exploitation of fly ash pneumatic transport systems in thermal power plants. in Brazilian Journal of Chemical Engineering. 2008;25(4):789-797.
doi:10.1590/S0104-66322008000400016 .

Stanojević, M., Radić, Dejan, Jovović, Aleksandar, Pavlović, M., Karamarković, Vladan, "The influence of variable operating conditions on the design and exploitation of fly ash pneumatic transport systems in thermal power plants" in Brazilian Journal of Chemical Engineering, 25, no. 4 (2008):789-797,
https://doi.org/10.1590/S0104-66322008000400016 . .

Karamarković, V., Ramić, B., Stamenić, M., Matejić, M., Đukanović, D., Stefanović, M., Karamarković, R., Jerotić, S., Gordić, D., Stojiljković, M.,& Kljajić, M.. (2007). Упутство за израду енергетског биланса у општинама. 
МИНИСТАРСТВО РУДАРСТВА И ЕНЕРГЕТИКЕ РЕПУБЛИКЕ СРБИЈЕ..
https://hdl.handle.net/21.15107/rcub_machinery_7392

Karamarković V, Ramić B, Stamenić M, Matejić M, Đukanović D, Stefanović M, Karamarković R, Jerotić S, Gordić D, Stojiljković M, Kljajić M. Упутство за израду енергетског биланса у општинама. 2007;:null-99.
https://hdl.handle.net/21.15107/rcub_machinery_7392 .

Karamarković, Vladan, Ramić, Biljana, Stamenić, Mirjana, Matejić, Maja, Đukanović, Dejan, Stefanović, Miša, Karamarković, Rade, Jerotić, Slobodan, Gordić, Dušan, Stojiljković, Mirko, Kljajić, Miroslav, "Упутство за израду енергетског биланса у општинама" (2007),
https://hdl.handle.net/21.15107/rcub_machinery_7392 .