Komatina, Mirko S.

Link to this page

Authority KeyName Variants
6c37fbb6-0348-40c6-8b52-2cafba55c768
  • Komatina, Mirko S. (8)
Projects

Author's Bibliography

Experimental investigation on the kinetics of biomass combustion in vertical tube reactor

Erić, Aleksandar; Nemoda, Stevan; Komatina, Mirko S.; Dakić, Dragoljub V.; Repić, Branislav

(2019)

TY  - JOUR
AU  - Erić, Aleksandar
AU  - Nemoda, Stevan
AU  - Komatina, Mirko S.
AU  - Dakić, Dragoljub V.
AU  - Repić, Branislav
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8401
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. © 2018 Energy Institute
T2  - Journal of the Energy Institute
T1  - Experimental investigation on the kinetics of biomass combustion in vertical tube reactor
VL  - 92
IS  - 4
SP  - 1077
EP  - 1090
DO  - 10.1016/j.joei.2018.06.009
ER  - 
@article{
author = "Erić, Aleksandar and Nemoda, Stevan and Komatina, Mirko S. and Dakić, Dragoljub V. 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. © 2018 Energy Institute",
journal = "Journal of the Energy Institute",
title = "Experimental investigation on the kinetics of biomass combustion in vertical tube reactor",
volume = "92",
number = "4",
pages = "1077-1090",
doi = "10.1016/j.joei.2018.06.009"
}
Erić, A., Nemoda, S., Komatina, M. S., Dakić, D. V.,& Repić, B.. (2019). Experimental investigation on the kinetics of biomass combustion in vertical tube reactor. in Journal of the Energy Institute, 92(4), 1077-1090.
https://doi.org/10.1016/j.joei.2018.06.009
Erić A, Nemoda S, Komatina MS, Dakić DV, 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 S., Dakić, Dragoljub V., 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 . .
5
4
6

Numerical simulation of latent heat storage with conductance enhancing fins

Rudonja, Nedzad R.; Komatina, Mirko S.; Antonijević, Dragi Lj.; Živković, Goran S.

(2016)

TY  - JOUR
AU  - Rudonja, Nedzad R.
AU  - Komatina, Mirko S.
AU  - Antonijević, Dragi Lj.
AU  - Živković, Goran S.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7151
AB  - Precise understanding of heat transfer processes inside the latent thermal energy storage exposed to different initial and boundary conditions is crucial for development of optimized design and operating features of similar devices. The paper presents 3D numerical study of phase change material heat storage in the shape of vertical cylinder reservoir with axially placed heat source/sink equipped with variable number of conductance enhancing longitudinal rectangular fins. As the principally important observed is the case of vertically variable heat flux supplied to the phase change material during the melting process. The numerical modeling is based on the physical model of the process and is being carried out by Fluent software that uses finite volume method for solving continuity, momentum and energy equations. The coupling between pressure and velocity is based on the Semi- Implicit Pressure- Linked Equation (SIMPLE) algorithm. The results of numerical simulations are verified through the comparison with the own experimental results. Exemplary results for characteristic heat storage geometries and boundary conditions are presented and analyzed in the paper.
T2  - Bulgarian Chemical Communications
T1  - Numerical simulation of latent heat storage with conductance enhancing fins
VL  - 48
SP  - 199
EP  - 205
ER  - 
@article{
author = "Rudonja, Nedzad R. and Komatina, Mirko S. and Antonijević, Dragi Lj. and Živković, Goran S.",
year = "2016",
abstract = "Precise understanding of heat transfer processes inside the latent thermal energy storage exposed to different initial and boundary conditions is crucial for development of optimized design and operating features of similar devices. The paper presents 3D numerical study of phase change material heat storage in the shape of vertical cylinder reservoir with axially placed heat source/sink equipped with variable number of conductance enhancing longitudinal rectangular fins. As the principally important observed is the case of vertically variable heat flux supplied to the phase change material during the melting process. The numerical modeling is based on the physical model of the process and is being carried out by Fluent software that uses finite volume method for solving continuity, momentum and energy equations. The coupling between pressure and velocity is based on the Semi- Implicit Pressure- Linked Equation (SIMPLE) algorithm. The results of numerical simulations are verified through the comparison with the own experimental results. Exemplary results for characteristic heat storage geometries and boundary conditions are presented and analyzed in the paper.",
journal = "Bulgarian Chemical Communications",
title = "Numerical simulation of latent heat storage with conductance enhancing fins",
volume = "48",
pages = "199-205"
}
Rudonja, N. R., Komatina, M. S., Antonijević, D. Lj.,& Živković, G. S.. (2016). Numerical simulation of latent heat storage with conductance enhancing fins. in Bulgarian Chemical Communications, 48, 199-205.
Rudonja NR, Komatina MS, Antonijević DL, Živković GS. Numerical simulation of latent heat storage with conductance enhancing fins. in Bulgarian Chemical Communications. 2016;48:199-205..
Rudonja, Nedzad R., Komatina, Mirko S., Antonijević, Dragi Lj., Živković, Goran S., "Numerical simulation of latent heat storage with conductance enhancing fins" in Bulgarian Chemical Communications, 48 (2016):199-205.

Heat Transfer Enhancement Through Pcm Thermal Storage By Use of Copper Fins

Rudonja, Nedzad R.; Komatina, Mirko S.; Živković, Goran S.; Antonijević, Dragi Lj.

(2016)

TY  - JOUR
AU  - Rudonja, Nedzad R.
AU  - Komatina, Mirko S.
AU  - Živković, Goran S.
AU  - Antonijević, Dragi Lj.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1148
AB  - Enhancement of heat transfer over a cylinder shaped thermal energy storage filled by paraffin E53 by use of longitudinal rectangular copper fins was analyzed. The thermo-physical features of the storage material are determined in separate experiments and implemented to FLUENT software over user defined function. Advanced thermal storage geometry comprehension and optimization required introduction of a parameter suitable for the analysis of heat transfer enhancement, so the ratio of heat transfer surfaces as a factor was proposed and applied. It is revealed that increase of the ratio of heat transfer surfaces leads to the decrease of melting time and vice versa. Numerical analysis, employing the 3-D model built in Ansys software, observed storage reservoir geometries with variable number of longitudinal fins. The adjusted set of boundary conditions was carried out and both written in C language and implemented over user defined function in order to define variable heat flux along the height of the heater. The comparison of acquired numerical and experimental results showed a strong correlation. Experimental validation of numerical results was done on the real thermal energy storage apparatus.
T2  - Thermal Science
T1  - Heat Transfer Enhancement Through Pcm Thermal Storage By Use of Copper Fins
VL  - 20
SP  - S251
EP  - S259
DO  - 10.2298/TSCI150729136R
ER  - 
@article{
author = "Rudonja, Nedzad R. and Komatina, Mirko S. and Živković, Goran S. and Antonijević, Dragi Lj.",
year = "2016",
abstract = "Enhancement of heat transfer over a cylinder shaped thermal energy storage filled by paraffin E53 by use of longitudinal rectangular copper fins was analyzed. The thermo-physical features of the storage material are determined in separate experiments and implemented to FLUENT software over user defined function. Advanced thermal storage geometry comprehension and optimization required introduction of a parameter suitable for the analysis of heat transfer enhancement, so the ratio of heat transfer surfaces as a factor was proposed and applied. It is revealed that increase of the ratio of heat transfer surfaces leads to the decrease of melting time and vice versa. Numerical analysis, employing the 3-D model built in Ansys software, observed storage reservoir geometries with variable number of longitudinal fins. The adjusted set of boundary conditions was carried out and both written in C language and implemented over user defined function in order to define variable heat flux along the height of the heater. The comparison of acquired numerical and experimental results showed a strong correlation. Experimental validation of numerical results was done on the real thermal energy storage apparatus.",
journal = "Thermal Science",
title = "Heat Transfer Enhancement Through Pcm Thermal Storage By Use of Copper Fins",
volume = "20",
pages = "S251-S259",
doi = "10.2298/TSCI150729136R"
}
Rudonja, N. R., Komatina, M. S., Živković, G. S.,& Antonijević, D. Lj.. (2016). Heat Transfer Enhancement Through Pcm Thermal Storage By Use of Copper Fins. in Thermal Science, 20, S251-S259.
https://doi.org/10.2298/TSCI150729136R
Rudonja NR, Komatina MS, Živković GS, Antonijević DL. Heat Transfer Enhancement Through Pcm Thermal Storage By Use of Copper Fins. in Thermal Science. 2016;20:S251-S259.
doi:10.2298/TSCI150729136R .
Rudonja, Nedzad R., Komatina, Mirko S., Živković, Goran S., Antonijević, Dragi Lj., "Heat Transfer Enhancement Through Pcm Thermal Storage By Use of Copper Fins" in Thermal Science, 20 (2016):S251-S259,
https://doi.org/10.2298/TSCI150729136R . .
5
5

Mechanism of Primary Fragmentation of Coal in Fluidized Bed

Paprika, Milijana; Komatina, Mirko S.; Mladenović, Milica R.; Živković, Goran S.; Dakić, Dragoljub V.

(2016)

TY  - JOUR
AU  - Paprika, Milijana
AU  - Komatina, Mirko S.
AU  - Mladenović, Milica R.
AU  - Živković, Goran S.
AU  - Dakić, Dragoljub V.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1139
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.
T2  - Thermal Science
T1  - Mechanism of Primary Fragmentation of Coal in Fluidized Bed
VL  - 20
SP  - S125
EP  - S132
DO  - 10.2298/TSCI150603224P
ER  - 
@article{
author = "Paprika, Milijana and Komatina, Mirko S. and Mladenović, Milica R. and Živković, Goran S. and Dakić, Dragoljub V.",
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.",
journal = "Thermal Science",
title = "Mechanism of Primary Fragmentation of Coal in Fluidized Bed",
volume = "20",
pages = "S125-S132",
doi = "10.2298/TSCI150603224P"
}
Paprika, M., Komatina, M. S., Mladenović, M. R., Živković, G. S.,& Dakić, D. V.. (2016). Mechanism of Primary Fragmentation of Coal in Fluidized Bed. in Thermal Science, 20, S125-S132.
https://doi.org/10.2298/TSCI150603224P
Paprika M, Komatina MS, Mladenović MR, Živković GS, Dakić DV. Mechanism of Primary Fragmentation of Coal in Fluidized Bed. in Thermal Science. 2016;20:S125-S132.
doi:10.2298/TSCI150603224P .
Paprika, Milijana, Komatina, Mirko S., Mladenović, Milica R., Živković, Goran S., Dakić, Dragoljub V., "Mechanism of Primary Fragmentation of Coal in Fluidized Bed" in Thermal Science, 20 (2016):S125-S132,
https://doi.org/10.2298/TSCI150603224P . .
3
3
4

The combustion of biomass - The impact of its types and combustion technologies on the emission of nitrogen oxide

Mladenović, Milica R.; Dakić, Dragoljub V.; Nemoda, Stevan; Paprika, Milijana; Komatina, Mirko S.; Repić, Branislav; Erić, Aleksandar

(2016)

TY  - JOUR
AU  - Mladenović, Milica R.
AU  - Dakić, Dragoljub V.
AU  - Nemoda, Stevan
AU  - Paprika, Milijana
AU  - Komatina, Mirko S.
AU  - Repić, Branislav
AU  - Erić, Aleksandar
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1199
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.
T2  - Hemijska industrija
T1  - The combustion of biomass - The impact of its types and combustion technologies on the emission of nitrogen oxide
VL  - 70
IS  - 3
SP  - 287
EP  - 298
DO  - 10.2298/HEMIND150409033M
ER  - 
@article{
author = "Mladenović, Milica R. and Dakić, Dragoljub V. and Nemoda, Stevan and Paprika, Milijana and Komatina, Mirko S. and Repić, Branislav and Erić, Aleksandar",
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.",
journal = "Hemijska industrija",
title = "The combustion of biomass - The impact of its types and combustion technologies on the emission of nitrogen oxide",
volume = "70",
number = "3",
pages = "287-298",
doi = "10.2298/HEMIND150409033M"
}
Mladenović, M. R., Dakić, D. V., Nemoda, S., Paprika, M., Komatina, M. S., Repić, B.,& Erić, A.. (2016). The combustion of biomass - The impact of its types and combustion technologies on the emission of nitrogen oxide. in Hemijska industrija, 70(3), 287-298.
https://doi.org/10.2298/HEMIND150409033M
Mladenović MR, Dakić DV, Nemoda S, Paprika M, Komatina MS, Repić B, Erić A. 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 V., Nemoda, Stevan, Paprika, Milijana, Komatina, Mirko S., Repić, Branislav, Erić, Aleksandar, "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 . .
1
8
5
9

Numerical Simulation of Non-Conventional Liquid Fuels Feeding in a Bubbling Fluidized Bed Combustor

Mladenović, Milica R.; Nemoda, Stevan; Komatina, Mirko S.; Dakić, Dragoljub V.

(2013)

TY  - JOUR
AU  - Mladenović, Milica R.
AU  - Nemoda, Stevan
AU  - Komatina, Mirko S.
AU  - Dakić, Dragoljub V.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5762
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, Fluents 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.
T2  - Thermal Science
T1  - Numerical Simulation of Non-Conventional Liquid Fuels Feeding in a Bubbling Fluidized Bed Combustor
VL  - 17
IS  - 4
SP  - 1163
EP  - 1179
DO  - 10.2298/TSCI121116007M
ER  - 
@article{
author = "Mladenović, Milica R. and Nemoda, Stevan and Komatina, Mirko S. and Dakić, Dragoljub V.",
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, Fluents 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.",
journal = "Thermal Science",
title = "Numerical Simulation of Non-Conventional Liquid Fuels Feeding in a Bubbling Fluidized Bed Combustor",
volume = "17",
number = "4",
pages = "1163-1179",
doi = "10.2298/TSCI121116007M"
}
Mladenović, M. R., Nemoda, S., Komatina, M. S.,& Dakić, D. V.. (2013). Numerical Simulation of Non-Conventional Liquid Fuels Feeding in a Bubbling Fluidized Bed Combustor. in Thermal Science, 17(4), 1163-1179.
https://doi.org/10.2298/TSCI121116007M
Mladenović MR, Nemoda S, Komatina MS, Dakić DV. 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 S., Dakić, Dragoljub V., "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 . .
2
2

Prediction of Coal Primary Fragmentation and Char Particle Size Distribution in Fluidized Bed

Paprika, Milijana; Komatina, Mirko S.; Dakić, Dragoljub V.; Nemoda, Stevan

(2013)

TY  - JOUR
AU  - Paprika, Milijana
AU  - Komatina, Mirko S.
AU  - Dakić, Dragoljub V.
AU  - Nemoda, Stevan
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5848
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.
T2  - Energy and Fuels
T1  - Prediction of Coal Primary Fragmentation and Char Particle Size Distribution in Fluidized Bed
VL  - 27
IS  - 9
SP  - 5488
EP  - 5494
DO  - 10.1021/ef400875q
ER  - 
@article{
author = "Paprika, Milijana and Komatina, Mirko S. and Dakić, Dragoljub V. 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.",
journal = "Energy and Fuels",
title = "Prediction of Coal Primary Fragmentation and Char Particle Size Distribution in Fluidized Bed",
volume = "27",
number = "9",
pages = "5488-5494",
doi = "10.1021/ef400875q"
}
Paprika, M., Komatina, M. S., Dakić, D. V.,& Nemoda, S.. (2013). Prediction of Coal Primary Fragmentation and Char Particle Size Distribution in Fluidized Bed. in Energy and Fuels, 27(9), 5488-5494.
https://doi.org/10.1021/ef400875q
Paprika M, Komatina MS, Dakić DV, Nemoda S. Prediction of Coal Primary Fragmentation and Char Particle Size Distribution in Fluidized Bed. in Energy and Fuels. 2013;27(9):5488-5494.
doi:10.1021/ef400875q .
Paprika, Milijana, Komatina, Mirko S., Dakić, Dragoljub V., Nemoda, Stevan, "Prediction of Coal Primary Fragmentation and Char Particle Size Distribution in Fluidized Bed" in Energy and Fuels, 27, no. 9 (2013):5488-5494,
https://doi.org/10.1021/ef400875q . .
16
17
20

Combustion of Low Grade Fractions of Lubnica Coal in Fluidized Bed

Mladenović, Milica R.; Dakić, Dragoljub V.; Nemoda, Stevan; Mladenovic, Rastko V.; Erić, Aleksandar; Repić, Branislav; Komatina, Mirko S.

(2012)

TY  - JOUR
AU  - Mladenović, Milica R.
AU  - Dakić, Dragoljub V.
AU  - Nemoda, Stevan
AU  - Mladenovic, Rastko V.
AU  - Erić, Aleksandar
AU  - Repić, Branislav
AU  - Komatina, Mirko S.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4822
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 kW(t). 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.
T2  - Thermal Science
T1  - Combustion of Low Grade Fractions of Lubnica Coal in Fluidized Bed
VL  - 16
IS  - 1
SP  - 297
EP  - 311
DO  - 10.2298/TSCI1201297M
ER  - 
@article{
author = "Mladenović, Milica R. and Dakić, Dragoljub V. and Nemoda, Stevan and Mladenovic, Rastko V. and Erić, Aleksandar and Repić, Branislav and Komatina, Mirko S.",
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 kW(t). 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.",
journal = "Thermal Science",
title = "Combustion of Low Grade Fractions of Lubnica Coal in Fluidized Bed",
volume = "16",
number = "1",
pages = "297-311",
doi = "10.2298/TSCI1201297M"
}
Mladenović, M. R., Dakić, D. V., Nemoda, S., Mladenovic, R. V., Erić, A., Repić, B.,& Komatina, M. S.. (2012). Combustion of Low Grade Fractions of Lubnica Coal in Fluidized Bed. in Thermal Science, 16(1), 297-311.
https://doi.org/10.2298/TSCI1201297M
Mladenović MR, Dakić DV, Nemoda S, Mladenovic RV, Erić A, Repić B, Komatina MS. 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 V., Nemoda, Stevan, Mladenovic, Rastko V., Erić, Aleksandar, Repić, Branislav, Komatina, Mirko S., "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 . .
6
6