TY  - JOUR
AU  - Kozić, Mirko
AU  - Ristić, Slavica
AU  - Katavić, Boris
AU  - Jegdić, Bore
AU  - Prvulović, Mirjana
AU  - Prokolab, Milan
AU  - Linić, Suzana
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2646
AB  - Numerical simulation of 3D multiphase flow is performed to determine the velocity field in the fan mill. The mixture model of the Euler-Euler approach is used. Recirculating gas is a primary phase that carries granular phases including the coal powder and sand. The latter causes heavy wear of mill impact plates. The optimal form of hardfacing geometry and technology has an impact both on velocity magnitude and direction of flow in such a way as to reduce plate wear. This paper presents results of surface modification (based on numerical simulation), implemented on impact plates of the fan mill in the Kostolac B power plant in Serbia. Fishbone hardfacing is made in order to increase the lifetime of impact plates and extend the period between overhauls of fan mills. The experimental tests of fishbone surfacing plates, in exploitation conditions, show that the applied modification, hardfacing technologies and coating materials, give expected results. The application of this hardfacing in the form of a fishbone is simpler, faster and more economical compared to complete overlaying and honeycomb impact plate surfacing. The relative weight loss of base plate after an 1440-hour period of exploitation is 8%, while the weight losses for the hard-faced plate is below 7%.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life-Integritet I Vek Konstrukcija
T1  - Wear resistance improvement of thermal plant fan mill impact plates based on numerical flow simulation
EP  - 228
IS  - 3
SP  - 221
VL  - 17
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2646
ER  - 

@article{
author = "Kozić, Mirko and Ristić, Slavica and Katavić, Boris and Jegdić, Bore and Prvulović, Mirjana and Prokolab, Milan and Linić, Suzana",
year = "2017",
abstract = "Numerical simulation of 3D multiphase flow is performed to determine the velocity field in the fan mill. The mixture model of the Euler-Euler approach is used. Recirculating gas is a primary phase that carries granular phases including the coal powder and sand. The latter causes heavy wear of mill impact plates. The optimal form of hardfacing geometry and technology has an impact both on velocity magnitude and direction of flow in such a way as to reduce plate wear. This paper presents results of surface modification (based on numerical simulation), implemented on impact plates of the fan mill in the Kostolac B power plant in Serbia. Fishbone hardfacing is made in order to increase the lifetime of impact plates and extend the period between overhauls of fan mills. The experimental tests of fishbone surfacing plates, in exploitation conditions, show that the applied modification, hardfacing technologies and coating materials, give expected results. The application of this hardfacing in the form of a fishbone is simpler, faster and more economical compared to complete overlaying and honeycomb impact plate surfacing. The relative weight loss of base plate after an 1440-hour period of exploitation is 8%, while the weight losses for the hard-faced plate is below 7%.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life-Integritet I Vek Konstrukcija",
title = "Wear resistance improvement of thermal plant fan mill impact plates based on numerical flow simulation",
pages = "228-221",
number = "3",
volume = "17",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2646"
}

Kozić, M., Ristić, S., Katavić, B., Jegdić, B., Prvulović, M., Prokolab, M.,& Linić, S.. (2017). Wear resistance improvement of thermal plant fan mill impact plates based on numerical flow simulation. in Structural Integrity and Life-Integritet I Vek Konstrukcija
Institut za ispitivanje materijala, Beograd., 17(3), 221-228.
https://hdl.handle.net/21.15107/rcub_machinery_2646

Kozić M, Ristić S, Katavić B, Jegdić B, Prvulović M, Prokolab M, Linić S. Wear resistance improvement of thermal plant fan mill impact plates based on numerical flow simulation. in Structural Integrity and Life-Integritet I Vek Konstrukcija. 2017;17(3):221-228.
https://hdl.handle.net/21.15107/rcub_machinery_2646 .

Kozić, Mirko, Ristić, Slavica, Katavić, Boris, Jegdić, Bore, Prvulović, Mirjana, Prokolab, Milan, Linić, Suzana, "Wear resistance improvement of thermal plant fan mill impact plates based on numerical flow simulation" in Structural Integrity and Life-Integritet I Vek Konstrukcija, 17, no. 3 (2017):221-228,
https://hdl.handle.net/21.15107/rcub_machinery_2646 .

TY  - JOUR
AU  - Ristić, M.
AU  - Prokić-Cvetković, Radica
AU  - Kozić, Mirko
AU  - Ristić, S.
AU  - Katavić, Boris
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2170
AB  - The aim of this paper is to present the investigations of the possibilities of increasing the wear resistance of the ventilation mill parts for coal grinding in power plants, by application of optimum hard coating technologies. High velocity of sand particles in the ventilation mill causes strong wear of the suction plates. The input data for plate modification are based on 3D numerical simulation of multiphase flow in grinding mill. The mixture model of the Euler-Euler approach is used. The results obtained in the numerical simulation serve for the selection of optimum redesign of the suction plates. To improve surface properties, the hard, wear-resistant coatings were created by hardfacing, technologies by manual metal arc and self-protecting flux core electrodes. Before applying hardfaced suction plates in the exploitation conditions, it is necessary to study model hardfaced samples. The experimental tests of redesigned suction plates during the real exploitation conditions show that the proposed technology of hardfacing gives good results. The relative weight loss of the suction plates after 1440 h period of exploitation in real conditions is very small 1-3%. The application of proposed technology can reduce the number of possible repairs and extends the period between them, resulting in significant economic effects.
PB  - Scibulcom Ltd.
T2  - Journal of the Balkan Tribological Association
T1  - Wear reducing of ventilation mill suction plates based on the multidisciplinary research
EP  - 513
IS  - 3
SP  - 493
VL  - 21
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2170
ER  - 

@article{
author = "Ristić, M. and Prokić-Cvetković, Radica and Kozić, Mirko and Ristić, S. and Katavić, Boris",
year = "2015",
abstract = "The aim of this paper is to present the investigations of the possibilities of increasing the wear resistance of the ventilation mill parts for coal grinding in power plants, by application of optimum hard coating technologies. High velocity of sand particles in the ventilation mill causes strong wear of the suction plates. The input data for plate modification are based on 3D numerical simulation of multiphase flow in grinding mill. The mixture model of the Euler-Euler approach is used. The results obtained in the numerical simulation serve for the selection of optimum redesign of the suction plates. To improve surface properties, the hard, wear-resistant coatings were created by hardfacing, technologies by manual metal arc and self-protecting flux core electrodes. Before applying hardfaced suction plates in the exploitation conditions, it is necessary to study model hardfaced samples. The experimental tests of redesigned suction plates during the real exploitation conditions show that the proposed technology of hardfacing gives good results. The relative weight loss of the suction plates after 1440 h period of exploitation in real conditions is very small 1-3%. The application of proposed technology can reduce the number of possible repairs and extends the period between them, resulting in significant economic effects.",
publisher = "Scibulcom Ltd.",
journal = "Journal of the Balkan Tribological Association",
title = "Wear reducing of ventilation mill suction plates based on the multidisciplinary research",
pages = "513-493",
number = "3",
volume = "21",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2170"
}

Ristić, M., Prokić-Cvetković, R., Kozić, M., Ristić, S.,& Katavić, B.. (2015). Wear reducing of ventilation mill suction plates based on the multidisciplinary research. in Journal of the Balkan Tribological Association
Scibulcom Ltd.., 21(3), 493-513.
https://hdl.handle.net/21.15107/rcub_machinery_2170

Ristić M, Prokić-Cvetković R, Kozić M, Ristić S, Katavić B. Wear reducing of ventilation mill suction plates based on the multidisciplinary research. in Journal of the Balkan Tribological Association. 2015;21(3):493-513.
https://hdl.handle.net/21.15107/rcub_machinery_2170 .

Ristić, M., Prokić-Cvetković, Radica, Kozić, Mirko, Ristić, S., Katavić, Boris, "Wear reducing of ventilation mill suction plates based on the multidisciplinary research" in Journal of the Balkan Tribological Association, 21, no. 3 (2015):493-513,
https://hdl.handle.net/21.15107/rcub_machinery_2170 .

TY  - JOUR
AU  - Ristić, M.
AU  - Prokić-Cvetković, Radica
AU  - Katavić, Boris
AU  - Vasović, Ivana
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2124
AB  - This paper presents results of the suction plate surface modification by hardfacing, of the ventilation mill in the Kostolac B power plant. Before applying hardfaced suction plates to exploitation conditions, it is necessary to study model hardfaced samples for determining the optimal tech-nology and filler material for revitalization. Experimental tests of revitalized mill suction plates in real exploitation conditions show that the proposed modification, hardfacing technologies and filler materials give good results. The relative weight loss of the suction plates after 1440 h period of exploitation in real conditions is 1-3%. The application of this approach can reduce the number of possible repairs and extends the period between them, resulting in significant economic effects.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Selecting hardfacing technologies for ventilation mill suction plates and extending its working life
EP  - 180
IS  - 3
SP  - 173
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2124
ER  - 

@article{
author = "Ristić, M. and Prokić-Cvetković, Radica and Katavić, Boris and Vasović, Ivana",
year = "2015",
abstract = "This paper presents results of the suction plate surface modification by hardfacing, of the ventilation mill in the Kostolac B power plant. Before applying hardfaced suction plates to exploitation conditions, it is necessary to study model hardfaced samples for determining the optimal tech-nology and filler material for revitalization. Experimental tests of revitalized mill suction plates in real exploitation conditions show that the proposed modification, hardfacing technologies and filler materials give good results. The relative weight loss of the suction plates after 1440 h period of exploitation in real conditions is 1-3%. The application of this approach can reduce the number of possible repairs and extends the period between them, resulting in significant economic effects.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Selecting hardfacing technologies for ventilation mill suction plates and extending its working life",
pages = "180-173",
number = "3",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2124"
}

Ristić, M., Prokić-Cvetković, R., Katavić, B.,& Vasović, I.. (2015). Selecting hardfacing technologies for ventilation mill suction plates and extending its working life. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 15(3), 173-180.
https://hdl.handle.net/21.15107/rcub_machinery_2124

Ristić M, Prokić-Cvetković R, Katavić B, Vasović I. Selecting hardfacing technologies for ventilation mill suction plates and extending its working life. in Structural Integrity and Life. 2015;15(3):173-180.
https://hdl.handle.net/21.15107/rcub_machinery_2124 .

Ristić, M., Prokić-Cvetković, Radica, Katavić, Boris, Vasović, Ivana, "Selecting hardfacing technologies for ventilation mill suction plates and extending its working life" in Structural Integrity and Life, 15, no. 3 (2015):173-180,
https://hdl.handle.net/21.15107/rcub_machinery_2124 .

TY  - JOUR
AU  - Vencl, Aleksandar
AU  - Katavić, Boris
AU  - Marković, Dragan
AU  - Ristić, M.
AU  - Gligorijević, B.
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2126
AB  - During the coal pulverizing, the working parts of the ventilation mill are being worn by the sand particles. For this reason, the working parts are usually protected with materials resistant to wear (hardfaced/thermal sprayed coatings). The aim of this study was to evaluate the tribological performance of four different types of coatings as candidates for wear protection of the mill’s working parts. The coatings were produced by using the filler materials with the following nominal chemical composition: NiFeBSi-WC, NiCrBSiC, FeCrCTiSi, and FeCrNiCSiBMn, and by using the plasma arc welding and flame and electric arc spraying processes. The results showed that Ni-based coatings exhibited higher wear resistance than Fe-based coatings. The highest wear resistance showed coating produced by using the NiFeBSi-WC filler material and plasma transferred arc welding deposition process. The hardness was not the only characteristic that affected the wear resistance. In this context, the wear rate of NiFeBSi-WC coating was not in correlation with its hardness, in contrast to other coatings. The different wear performance of NiFeBSi-WC coating was attributed to the different type and morphological features of the reinforcing particles (WC).
PB  - Fakultet inženjerskih nauka, Kragujevac
T2  - Tribology in Industry
T1  - The tribological performance of hardfaced/ thermal sprayed coatings for increasing the wear resistance of ventilation mill working parts
EP  - 329
IS  - 3
SP  - 320
VL  - 37
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2126
ER  - 

@article{
author = "Vencl, Aleksandar and Katavić, Boris and Marković, Dragan and Ristić, M. and Gligorijević, B.",
year = "2015",
abstract = "During the coal pulverizing, the working parts of the ventilation mill are being worn by the sand particles. For this reason, the working parts are usually protected with materials resistant to wear (hardfaced/thermal sprayed coatings). The aim of this study was to evaluate the tribological performance of four different types of coatings as candidates for wear protection of the mill’s working parts. The coatings were produced by using the filler materials with the following nominal chemical composition: NiFeBSi-WC, NiCrBSiC, FeCrCTiSi, and FeCrNiCSiBMn, and by using the plasma arc welding and flame and electric arc spraying processes. The results showed that Ni-based coatings exhibited higher wear resistance than Fe-based coatings. The highest wear resistance showed coating produced by using the NiFeBSi-WC filler material and plasma transferred arc welding deposition process. The hardness was not the only characteristic that affected the wear resistance. In this context, the wear rate of NiFeBSi-WC coating was not in correlation with its hardness, in contrast to other coatings. The different wear performance of NiFeBSi-WC coating was attributed to the different type and morphological features of the reinforcing particles (WC).",
publisher = "Fakultet inženjerskih nauka, Kragujevac",
journal = "Tribology in Industry",
title = "The tribological performance of hardfaced/ thermal sprayed coatings for increasing the wear resistance of ventilation mill working parts",
pages = "329-320",
number = "3",
volume = "37",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2126"
}

Vencl, A., Katavić, B., Marković, D., Ristić, M.,& Gligorijević, B.. (2015). The tribological performance of hardfaced/ thermal sprayed coatings for increasing the wear resistance of ventilation mill working parts. in Tribology in Industry
Fakultet inženjerskih nauka, Kragujevac., 37(3), 320-329.
https://hdl.handle.net/21.15107/rcub_machinery_2126

Vencl A, Katavić B, Marković D, Ristić M, Gligorijević B. The tribological performance of hardfaced/ thermal sprayed coatings for increasing the wear resistance of ventilation mill working parts. in Tribology in Industry. 2015;37(3):320-329.
https://hdl.handle.net/21.15107/rcub_machinery_2126 .

Vencl, Aleksandar, Katavić, Boris, Marković, Dragan, Ristić, M., Gligorijević, B., "The tribological performance of hardfaced/ thermal sprayed coatings for increasing the wear resistance of ventilation mill working parts" in Tribology in Industry, 37, no. 3 (2015):320-329,
https://hdl.handle.net/21.15107/rcub_machinery_2126 .

TY  - JOUR
AU  - Vencl, Aleksandar
AU  - Gligorijević, B.
AU  - Katavić, Boris
AU  - Nedić, B.
AU  - Džunić, D.
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1794
AB  - Abrasive wear is one of the most common types of wear, which makes abrasive wear resistance very important in many industries. The hard facing is considered as useful and economical way to improve the performance of components submitted to severe abrasive wear conditions, with wide range of applicable filler materials. The abrasive wear resistance of the three different hard faced coatings (two iron-based and one WC-based), which were intended to be used for reparation of the impact plates of the ventilation mill, was investigated and compared. Abrasive wear tests were carried-out by using the scratch tester under the dry conditions. Three normal loads of 10, 50 and 100 N and the constant sliding speed of 4 mm/s were used. Scratch test was chosen as a relatively easy and quick test method. Wear mechanism analysis showed significant influence of the hard faced coatings structure, which, along with hardness, has determined coatings abrasive wear resistance.
PB  - Fakultet inženjerskih nauka, Kragujevac
T2  - Tribology in Industry
T1  - Abrasive wear resistance of the iron- and WC-based hard faced coatings evaluated with scratch test method
EP  - 127
IS  - 2
SP  - 123
VL  - 35
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1794
ER  - 

@article{
author = "Vencl, Aleksandar and Gligorijević, B. and Katavić, Boris and Nedić, B. and Džunić, D.",
year = "2013",
abstract = "Abrasive wear is one of the most common types of wear, which makes abrasive wear resistance very important in many industries. The hard facing is considered as useful and economical way to improve the performance of components submitted to severe abrasive wear conditions, with wide range of applicable filler materials. The abrasive wear resistance of the three different hard faced coatings (two iron-based and one WC-based), which were intended to be used for reparation of the impact plates of the ventilation mill, was investigated and compared. Abrasive wear tests were carried-out by using the scratch tester under the dry conditions. Three normal loads of 10, 50 and 100 N and the constant sliding speed of 4 mm/s were used. Scratch test was chosen as a relatively easy and quick test method. Wear mechanism analysis showed significant influence of the hard faced coatings structure, which, along with hardness, has determined coatings abrasive wear resistance.",
publisher = "Fakultet inženjerskih nauka, Kragujevac",
journal = "Tribology in Industry",
title = "Abrasive wear resistance of the iron- and WC-based hard faced coatings evaluated with scratch test method",
pages = "127-123",
number = "2",
volume = "35",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1794"
}

Vencl, A., Gligorijević, B., Katavić, B., Nedić, B.,& Džunić, D.. (2013). Abrasive wear resistance of the iron- and WC-based hard faced coatings evaluated with scratch test method. in Tribology in Industry
Fakultet inženjerskih nauka, Kragujevac., 35(2), 123-127.
https://hdl.handle.net/21.15107/rcub_machinery_1794

Vencl A, Gligorijević B, Katavić B, Nedić B, Džunić D. Abrasive wear resistance of the iron- and WC-based hard faced coatings evaluated with scratch test method. in Tribology in Industry. 2013;35(2):123-127.
https://hdl.handle.net/21.15107/rcub_machinery_1794 .

Vencl, Aleksandar, Gligorijević, B., Katavić, Boris, Nedić, B., Džunić, D., "Abrasive wear resistance of the iron- and WC-based hard faced coatings evaluated with scratch test method" in Tribology in Industry, 35, no. 2 (2013):123-127,
https://hdl.handle.net/21.15107/rcub_machinery_1794 .