Škobalj, Predrag D.

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  • Škobalj, Predrag D. (7)

Author's Bibliography

Mathematical modelling of swirl oxy-fuel burner flame characteristics

Jovanović, Rastko D.; Swiatkowski, Bartosz; Kakietek, Slawomir; Škobalj, Predrag D.; Lazović, Ivan; Cvetinović, Dejan

(2019)

TY  - JOUR
AU  - Jovanović, Rastko D.
AU  - Swiatkowski, Bartosz
AU  - Kakietek, Slawomir
AU  - Škobalj, Predrag D.
AU  - Lazović, Ivan
AU  - Cvetinović, Dejan
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S019689041930439X
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/8149
AB  - Oxy-fuel combustion is the most promising carbon capture and storage technology, which eliminates carbon dioxide emissions into the atmosphere and also decreases nitrogen oxides emissions thereby lowering global warming potential. In order to implement oxy-fuel combustion technology in full scale power plants, its costs, mainly connected with the amount of pure oxygen produced, must be lowered. The main hypothesis is that it is possible to maintain similar velocity and heat transfer distribution while maintaining stable and efficient burner operation during both combustion technologies modifying burner aerodynamics. Excess oxygen is chosen as a representative parameter of burner's performance and investigation is carried out for four different oxy-fuel burner oxygen excess ratios (λ: 0.8, 0.98, 1.07, and 1.24) together with reference air combustion case. This study suggests a workflow, based on semi-industrial experimental investigations and computational fluid dynamics model composed of advanced sub-models for different combustion phases for development of real scale dual-mode coal swirl burners able for efficient operation during both combustion regimes. The results show that the temperature in near-burner zone and nitrogen oxides emissions increase, while carbon monoxide emissions decrease with the increase of burner oxygen excess ratio, and stable combustion with similar velocity and temperature distributions for both combustion modes is achieved for oxygen excess ratio of 1.07, with decrease in nitrogen oxides and carbon monoxide emissions during oxy-fuel combustion. The performed study demonstrates that it is possible to choose the appropriate burner settings regarding nitrogen oxides and carbon monoxide emissions and burner's ability to operate stably in both air and oxy-fuel combustion modes. © 2019 Elsevier Ltd
T2  - Energy Conversion and Management
T1  - Mathematical modelling of swirl oxy-fuel burner flame characteristics
VL  - 191
SP  - 193
EP  - 207
DO  - 10.1016/j.enconman.2019.04.027
ER  - 
@article{
author = "Jovanović, Rastko D. and Swiatkowski, Bartosz and Kakietek, Slawomir and Škobalj, Predrag D. and Lazović, Ivan and Cvetinović, Dejan",
year = "2019",
abstract = "Oxy-fuel combustion is the most promising carbon capture and storage technology, which eliminates carbon dioxide emissions into the atmosphere and also decreases nitrogen oxides emissions thereby lowering global warming potential. In order to implement oxy-fuel combustion technology in full scale power plants, its costs, mainly connected with the amount of pure oxygen produced, must be lowered. The main hypothesis is that it is possible to maintain similar velocity and heat transfer distribution while maintaining stable and efficient burner operation during both combustion technologies modifying burner aerodynamics. Excess oxygen is chosen as a representative parameter of burner's performance and investigation is carried out for four different oxy-fuel burner oxygen excess ratios (λ: 0.8, 0.98, 1.07, and 1.24) together with reference air combustion case. This study suggests a workflow, based on semi-industrial experimental investigations and computational fluid dynamics model composed of advanced sub-models for different combustion phases for development of real scale dual-mode coal swirl burners able for efficient operation during both combustion regimes. The results show that the temperature in near-burner zone and nitrogen oxides emissions increase, while carbon monoxide emissions decrease with the increase of burner oxygen excess ratio, and stable combustion with similar velocity and temperature distributions for both combustion modes is achieved for oxygen excess ratio of 1.07, with decrease in nitrogen oxides and carbon monoxide emissions during oxy-fuel combustion. The performed study demonstrates that it is possible to choose the appropriate burner settings regarding nitrogen oxides and carbon monoxide emissions and burner's ability to operate stably in both air and oxy-fuel combustion modes. © 2019 Elsevier Ltd",
journal = "Energy Conversion and Management",
title = "Mathematical modelling of swirl oxy-fuel burner flame characteristics",
volume = "191",
pages = "193-207",
doi = "10.1016/j.enconman.2019.04.027"
}
Jovanović, R. D., Swiatkowski, B., Kakietek, S., Škobalj, P. D., Lazović, I.,& Cvetinović, D.. (2019). Mathematical modelling of swirl oxy-fuel burner flame characteristics. in Energy Conversion and Management, 191, 193-207.
https://doi.org/10.1016/j.enconman.2019.04.027
Jovanović RD, Swiatkowski B, Kakietek S, Škobalj PD, Lazović I, Cvetinović D. Mathematical modelling of swirl oxy-fuel burner flame characteristics. in Energy Conversion and Management. 2019;191:193-207.
doi:10.1016/j.enconman.2019.04.027 .
Jovanović, Rastko D., Swiatkowski, Bartosz, Kakietek, Slawomir, Škobalj, Predrag D., Lazović, Ivan, Cvetinović, Dejan, "Mathematical modelling of swirl oxy-fuel burner flame characteristics" in Energy Conversion and Management, 191 (2019):193-207,
https://doi.org/10.1016/j.enconman.2019.04.027 . .
10
9
10

Multi-criteria sustainability analysis of thermal power plant Kolubara-A Unit 2

Škobalj, Predrag D.; Kijevčanin, Mirjana Lj.; Afgan, Naim H.; Jovanović, Marina P.; Turanjanin, Valentina; Vučićević, Biljana S.

(2017)

TY  - JOUR
AU  - Škobalj, Predrag D.
AU  - Kijevčanin, Mirjana Lj.
AU  - Afgan, Naim H.
AU  - Jovanović, Marina P.
AU  - Turanjanin, Valentina
AU  - Vučićević, Biljana S.
PY  - 2017
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1574
AB  - The paper presents a possible approach for creating business decisions based on multi-criteria analysis. Seven options for a possible revitalization of the thermal power plant Kolubara-A Unit No. 2 with energy indicators of sustainable development (EISD) are presented in this paper. The chosen EISD numerically express the essential features of the analyzed options, while the sustainability criteria indicate the option quality within the limits of these indicators. In this paper, the criteria for assessing the sustainability options are defined based on several aspects: economic, social, environmental and technological. In the process of assessing the sustainability of the considered options the Analysis and Synthesis of Parameters under Information Deficiency (ASPID) method was used. In this paper, the EISD show that production and energy consumption are closely linked to economic, environmental and other indicators, such as economic and technological development of local communities with employment being one of the most important social parameter. Multi-criteria analysis for the case study of the TPP Kolubara-A clearly indicated recommendations to decision makers on the choice of the best available options in dependence on the energy policy. (C) 2017 Elsevier Ltd. All rights reserved.
T2  - Energy
T1  - Multi-criteria sustainability analysis of thermal power plant Kolubara-A Unit 2
VL  - 125
SP  - 837
EP  - 847
DO  - 10.1016/j.energy.2017.02.027
ER  - 
@article{
author = "Škobalj, Predrag D. and Kijevčanin, Mirjana Lj. and Afgan, Naim H. and Jovanović, Marina P. and Turanjanin, Valentina and Vučićević, Biljana S.",
year = "2017",
abstract = "The paper presents a possible approach for creating business decisions based on multi-criteria analysis. Seven options for a possible revitalization of the thermal power plant Kolubara-A Unit No. 2 with energy indicators of sustainable development (EISD) are presented in this paper. The chosen EISD numerically express the essential features of the analyzed options, while the sustainability criteria indicate the option quality within the limits of these indicators. In this paper, the criteria for assessing the sustainability options are defined based on several aspects: economic, social, environmental and technological. In the process of assessing the sustainability of the considered options the Analysis and Synthesis of Parameters under Information Deficiency (ASPID) method was used. In this paper, the EISD show that production and energy consumption are closely linked to economic, environmental and other indicators, such as economic and technological development of local communities with employment being one of the most important social parameter. Multi-criteria analysis for the case study of the TPP Kolubara-A clearly indicated recommendations to decision makers on the choice of the best available options in dependence on the energy policy. (C) 2017 Elsevier Ltd. All rights reserved.",
journal = "Energy",
title = "Multi-criteria sustainability analysis of thermal power plant Kolubara-A Unit 2",
volume = "125",
pages = "837-847",
doi = "10.1016/j.energy.2017.02.027"
}
Škobalj, P. D., Kijevčanin, M. Lj., Afgan, N. H., Jovanović, M. P., Turanjanin, V.,& Vučićević, B. S.. (2017). Multi-criteria sustainability analysis of thermal power plant Kolubara-A Unit 2. in Energy, 125, 837-847.
https://doi.org/10.1016/j.energy.2017.02.027
Škobalj PD, Kijevčanin ML, Afgan NH, Jovanović MP, Turanjanin V, Vučićević BS. Multi-criteria sustainability analysis of thermal power plant Kolubara-A Unit 2. in Energy. 2017;125:837-847.
doi:10.1016/j.energy.2017.02.027 .
Škobalj, Predrag D., Kijevčanin, Mirjana Lj., Afgan, Naim H., Jovanović, Marina P., Turanjanin, Valentina, Vučićević, Biljana S., "Multi-criteria sustainability analysis of thermal power plant Kolubara-A Unit 2" in Energy, 125 (2017):837-847,
https://doi.org/10.1016/j.energy.2017.02.027 . .
8
5
7

Energy Indicators Impact in Multi-Criteria Sustainability Analyse of Thermal Power Plant Unit

Škobalj, Predrag D.; Kijevčanin, Mirjana Lj.; Jovanović, Marina P.; Afgan, Naim H.; Erić, Milić D.

(2017)

TY  - JOUR
AU  - Škobalj, Predrag D.
AU  - Kijevčanin, Mirjana Lj.
AU  - Jovanović, Marina P.
AU  - Afgan, Naim H.
AU  - Erić, Milić D.
PY  - 2017
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1550
AB  - This paper presents method for sustainability assessment of thermal power plant unit using multi-criteria analysis with aim to create base for business decision. Seven options of possible status of thermal power plant Kolubara A unit No. 2 with energy indicators of sustainable development were shown. Energy indicators of sustainable development consists of sets of resource preservation, economic, environmental, and social indicators. Sustainability assessment often fails to account for social influence on energy system. Considering to this, special focus will be on social indicators, their definition, forming, and impact on multi-criteria sustainability analysis. Analysis of quality of the selected options (energy systems) in respect to sustainable development by compare of their general index of sustainability is presented. Methodology of multi-criteria analyse of thermal power plant unit can show decision makers how to find best available options when the social indicators impact is leading. The aim of this paper is to choose the criteria for the evaluation of the available options, determine the relative importance of specific criteria and present methodology of multi-criteria analysis in the decision-making process.
T2  - Thermal Science
T1  - Energy Indicators Impact in Multi-Criteria Sustainability Analyse of Thermal Power Plant Unit
VL  - 21
IS  - 2
SP  - 1143
EP  - 1151
DO  - 10.2298/TSCI160215178S
ER  - 
@article{
author = "Škobalj, Predrag D. and Kijevčanin, Mirjana Lj. and Jovanović, Marina P. and Afgan, Naim H. and Erić, Milić D.",
year = "2017",
abstract = "This paper presents method for sustainability assessment of thermal power plant unit using multi-criteria analysis with aim to create base for business decision. Seven options of possible status of thermal power plant Kolubara A unit No. 2 with energy indicators of sustainable development were shown. Energy indicators of sustainable development consists of sets of resource preservation, economic, environmental, and social indicators. Sustainability assessment often fails to account for social influence on energy system. Considering to this, special focus will be on social indicators, their definition, forming, and impact on multi-criteria sustainability analysis. Analysis of quality of the selected options (energy systems) in respect to sustainable development by compare of their general index of sustainability is presented. Methodology of multi-criteria analyse of thermal power plant unit can show decision makers how to find best available options when the social indicators impact is leading. The aim of this paper is to choose the criteria for the evaluation of the available options, determine the relative importance of specific criteria and present methodology of multi-criteria analysis in the decision-making process.",
journal = "Thermal Science",
title = "Energy Indicators Impact in Multi-Criteria Sustainability Analyse of Thermal Power Plant Unit",
volume = "21",
number = "2",
pages = "1143-1151",
doi = "10.2298/TSCI160215178S"
}
Škobalj, P. D., Kijevčanin, M. Lj., Jovanović, M. P., Afgan, N. H.,& Erić, M. D.. (2017). Energy Indicators Impact in Multi-Criteria Sustainability Analyse of Thermal Power Plant Unit. in Thermal Science, 21(2), 1143-1151.
https://doi.org/10.2298/TSCI160215178S
Škobalj PD, Kijevčanin ML, Jovanović MP, Afgan NH, Erić MD. Energy Indicators Impact in Multi-Criteria Sustainability Analyse of Thermal Power Plant Unit. in Thermal Science. 2017;21(2):1143-1151.
doi:10.2298/TSCI160215178S .
Škobalj, Predrag D., Kijevčanin, Mirjana Lj., Jovanović, Marina P., Afgan, Naim H., Erić, Milić D., "Energy Indicators Impact in Multi-Criteria Sustainability Analyse of Thermal Power Plant Unit" in Thermal Science, 21, no. 2 (2017):1143-1151,
https://doi.org/10.2298/TSCI160215178S . .
1

Novel Fragmentation Model for Pulverized Coal Particles Gasification in Low Temperature Air Thermal Plasma

Jovanović, Rastko D.; Cvetinović, Dejan; Stefanović, Predrag Lj.; Škobalj, Predrag D.; Marković, Zoran M.

(2016)

TY  - JOUR
AU  - Jovanović, Rastko D.
AU  - Cvetinović, Dejan
AU  - Stefanović, Predrag Lj.
AU  - Škobalj, Predrag D.
AU  - Marković, Zoran M.
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1145
AB  - New system for start-up and flame support based on coal gasification by low temperature air thermal plasma is planned to supplement current heavy oil system in Serbian thermal power plants in order to decrease air pollutions emission and operational costs. Locally introduced plasma thermal energy heats up and ignites entrained coal particles, thus starting chain process which releases heat energy from gasified coal particles inside burner channel. Important stages during particle combustion, such as particle devolatilisation and char combustion, are described with satisfying accuracy in existing commercial computer fluid dynamics codes that are extensively used as powerful tool for pulverized coal combustion and gasification modeling. However, during plasma coal gasification, high plasma temperature induces strong thermal stresses inside interacting coal particles. These stresses lead to thermal shock and extensive particle fragmentation during which coal particles with initial size of 50-100 mu m disintegrate into fragments of at most 5-10 mu m. This intensifies volatile release by a factor 3-4 and substantially accelerates the oxidation of combustible matter. Particle fragmentation, due to its small size and thus limited influence on combustion process is commonly neglected in modelling. The main focus of this work is to suggest novel approach to pulverized coal gasification under high temperature conditions and to implement it into commercial comprehensive code ANSYS FLUENT 14.0. Proposed model was validated against experimental data obtained in newly built pilot scale direct current plasma burner test facility. Newly developed model showed very good agreement with experimental results with relative error less than 10%, while the standard built-in gasification model had error up to 25%.
T2  - Thermal Science
T1  - Novel Fragmentation Model for Pulverized Coal Particles Gasification in Low Temperature Air Thermal Plasma
VL  - 20
SP  - S207
EP  - S221
DO  - 10.2298/TSCI151222015J
ER  - 
@article{
author = "Jovanović, Rastko D. and Cvetinović, Dejan and Stefanović, Predrag Lj. and Škobalj, Predrag D. and Marković, Zoran M.",
year = "2016",
abstract = "New system for start-up and flame support based on coal gasification by low temperature air thermal plasma is planned to supplement current heavy oil system in Serbian thermal power plants in order to decrease air pollutions emission and operational costs. Locally introduced plasma thermal energy heats up and ignites entrained coal particles, thus starting chain process which releases heat energy from gasified coal particles inside burner channel. Important stages during particle combustion, such as particle devolatilisation and char combustion, are described with satisfying accuracy in existing commercial computer fluid dynamics codes that are extensively used as powerful tool for pulverized coal combustion and gasification modeling. However, during plasma coal gasification, high plasma temperature induces strong thermal stresses inside interacting coal particles. These stresses lead to thermal shock and extensive particle fragmentation during which coal particles with initial size of 50-100 mu m disintegrate into fragments of at most 5-10 mu m. This intensifies volatile release by a factor 3-4 and substantially accelerates the oxidation of combustible matter. Particle fragmentation, due to its small size and thus limited influence on combustion process is commonly neglected in modelling. The main focus of this work is to suggest novel approach to pulverized coal gasification under high temperature conditions and to implement it into commercial comprehensive code ANSYS FLUENT 14.0. Proposed model was validated against experimental data obtained in newly built pilot scale direct current plasma burner test facility. Newly developed model showed very good agreement with experimental results with relative error less than 10%, while the standard built-in gasification model had error up to 25%.",
journal = "Thermal Science",
title = "Novel Fragmentation Model for Pulverized Coal Particles Gasification in Low Temperature Air Thermal Plasma",
volume = "20",
pages = "S207-S221",
doi = "10.2298/TSCI151222015J"
}
Jovanović, R. D., Cvetinović, D., Stefanović, P. Lj., Škobalj, P. D.,& Marković, Z. M.. (2016). Novel Fragmentation Model for Pulverized Coal Particles Gasification in Low Temperature Air Thermal Plasma. in Thermal Science, 20, S207-S221.
https://doi.org/10.2298/TSCI151222015J
Jovanović RD, Cvetinović D, Stefanović PL, Škobalj PD, Marković ZM. Novel Fragmentation Model for Pulverized Coal Particles Gasification in Low Temperature Air Thermal Plasma. in Thermal Science. 2016;20:S207-S221.
doi:10.2298/TSCI151222015J .
Jovanović, Rastko D., Cvetinović, Dejan, Stefanović, Predrag Lj., Škobalj, Predrag D., Marković, Zoran M., "Novel Fragmentation Model for Pulverized Coal Particles Gasification in Low Temperature Air Thermal Plasma" in Thermal Science, 20 (2016):S207-S221,
https://doi.org/10.2298/TSCI151222015J . .
2
3

Application of multi-criteria assessment in decision-making proces in planning of sustainable development of energy system options

Škobalj, Predrag D.; Jovanović, Marina P.; Vučićević, Biljana S.; Turanjanin, Valentina; Kijevčanin, Mirjana Lj.

(2016)

TY  - CONF
AU  - Škobalj, Predrag D.
AU  - Jovanović, Marina P.
AU  - Vučićević, Biljana S.
AU  - Turanjanin, Valentina
AU  - Kijevčanin, Mirjana Lj.
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/7138
AB  - Coal combustion power plant Kolubara A has five thermal units with total installed capacity of 270 MW operates as a part of Public Enterprise which has planned to accept and apply the Clean Development Mechanism (new power plants on lignite and natural gas with higher energy efficiency as well as activities related to the rehabilitation and modernization of existing facilities). Two units were put in operation before more than fifty years and in order to extend the lifetime of these blocks in the process of revitalization, in this paper, beside an existing option which considers coal (lignite) combustion, are analysed possible options of thermal power units with gas and renewable energy sources: biomass, renewable solid fuels, waste materials, wind and sun. Paper presents seven energy system options of the thermal unit status which are described with suitable chosen indicators in respect to different aspects of sustainability: economical, ecological, social and resources indicators. In this paper energy indicators are defined as a tool for the sustainability assessment of energy system options. ASPID method of multi-criteria assessment was used to calculate general index of sustainability and obtained ranking of options. This study presented and analysed cases, with predefined constraints when priority has environmental indicator and different conditions where one of sub-indicators have priority, as an example of applying multi-criteria method.
T1  - Application of multi-criteria assessment in decision-making proces in planning of sustainable development of energy system options
ER  - 
@conference{
author = "Škobalj, Predrag D. and Jovanović, Marina P. and Vučićević, Biljana S. and Turanjanin, Valentina and Kijevčanin, Mirjana Lj.",
year = "2016",
abstract = "Coal combustion power plant Kolubara A has five thermal units with total installed capacity of 270 MW operates as a part of Public Enterprise which has planned to accept and apply the Clean Development Mechanism (new power plants on lignite and natural gas with higher energy efficiency as well as activities related to the rehabilitation and modernization of existing facilities). Two units were put in operation before more than fifty years and in order to extend the lifetime of these blocks in the process of revitalization, in this paper, beside an existing option which considers coal (lignite) combustion, are analysed possible options of thermal power units with gas and renewable energy sources: biomass, renewable solid fuels, waste materials, wind and sun. Paper presents seven energy system options of the thermal unit status which are described with suitable chosen indicators in respect to different aspects of sustainability: economical, ecological, social and resources indicators. In this paper energy indicators are defined as a tool for the sustainability assessment of energy system options. ASPID method of multi-criteria assessment was used to calculate general index of sustainability and obtained ranking of options. This study presented and analysed cases, with predefined constraints when priority has environmental indicator and different conditions where one of sub-indicators have priority, as an example of applying multi-criteria method.",
title = "Application of multi-criteria assessment in decision-making proces in planning of sustainable development of energy system options"
}
Škobalj, P. D., Jovanović, M. P., Vučićević, B. S., Turanjanin, V.,& Kijevčanin, M. Lj.. (2016). Application of multi-criteria assessment in decision-making proces in planning of sustainable development of energy system options. .
Škobalj PD, Jovanović MP, Vučićević BS, Turanjanin V, Kijevčanin ML. Application of multi-criteria assessment in decision-making proces in planning of sustainable development of energy system options. 2016;..
Škobalj, Predrag D., Jovanović, Marina P., Vučićević, Biljana S., Turanjanin, Valentina, Kijevčanin, Mirjana Lj., "Application of multi-criteria assessment in decision-making proces in planning of sustainable development of energy system options" (2016).

An initial study on feasible treatment of Serbian lignite through utilization of low-rank coal upgrading technologies

Stakic, Milan; Cvetinović, Dejan; Škobalj, Predrag D.; Spasojević, Vuk D.

(2014)

TY  - JOUR
AU  - Stakic, Milan
AU  - Cvetinović, Dejan
AU  - Škobalj, Predrag D.
AU  - Spasojević, Vuk D.
PY  - 2014
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/243
AB  - Despite benefiting from vast fuel reserves, combustion of low-rank coals is commonly characterized by low thermal efficiency and high pollutant emissions, partly due to high moisture content of the coals in question. Thus, removal of moisture from low-rank coals is deemed an important quality upgrading method. The paper provides an overview of the current status of low-rank coal upgrading technologies, particularly with respect to utilization of drying and dewatering procedures. In order to examine the influence of relevant parameters on the moisture removal process, a model of convective coal drying in a packed, as well as in a fluid bed combustion arrangement, is developed and presented. Product-specific data (intraparticle mass transfer, gas-solid moisture equilibrium) related to the coal variety addressed herein (lignite) are obtained through preliminary investigations. Effective thermal conductivity of the packed bed as defined by Zehner/Bauer/Schlunder is used to define heat transfer mechanisms occurring in the packed bed. Similar two-phase fluidization model has been validated for different types of biomaterials. (C) 2014 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
T2  - Chemical Engineering Research and Design
T1  - An initial study on feasible treatment of Serbian lignite through utilization of low-rank coal upgrading technologies
VL  - 92
IS  - 11
SP  - 2383
EP  - 2395
DO  - 10.1016/j.cherd.2014.02.032
ER  - 
@article{
author = "Stakic, Milan and Cvetinović, Dejan and Škobalj, Predrag D. and Spasojević, Vuk D.",
year = "2014",
abstract = "Despite benefiting from vast fuel reserves, combustion of low-rank coals is commonly characterized by low thermal efficiency and high pollutant emissions, partly due to high moisture content of the coals in question. Thus, removal of moisture from low-rank coals is deemed an important quality upgrading method. The paper provides an overview of the current status of low-rank coal upgrading technologies, particularly with respect to utilization of drying and dewatering procedures. In order to examine the influence of relevant parameters on the moisture removal process, a model of convective coal drying in a packed, as well as in a fluid bed combustion arrangement, is developed and presented. Product-specific data (intraparticle mass transfer, gas-solid moisture equilibrium) related to the coal variety addressed herein (lignite) are obtained through preliminary investigations. Effective thermal conductivity of the packed bed as defined by Zehner/Bauer/Schlunder is used to define heat transfer mechanisms occurring in the packed bed. Similar two-phase fluidization model has been validated for different types of biomaterials. (C) 2014 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.",
journal = "Chemical Engineering Research and Design",
title = "An initial study on feasible treatment of Serbian lignite through utilization of low-rank coal upgrading technologies",
volume = "92",
number = "11",
pages = "2383-2395",
doi = "10.1016/j.cherd.2014.02.032"
}
Stakic, M., Cvetinović, D., Škobalj, P. D.,& Spasojević, V. D.. (2014). An initial study on feasible treatment of Serbian lignite through utilization of low-rank coal upgrading technologies. in Chemical Engineering Research and Design, 92(11), 2383-2395.
https://doi.org/10.1016/j.cherd.2014.02.032
Stakic M, Cvetinović D, Škobalj PD, Spasojević VD. An initial study on feasible treatment of Serbian lignite through utilization of low-rank coal upgrading technologies. in Chemical Engineering Research and Design. 2014;92(11):2383-2395.
doi:10.1016/j.cherd.2014.02.032 .
Stakic, Milan, Cvetinović, Dejan, Škobalj, Predrag D., Spasojević, Vuk D., "An initial study on feasible treatment of Serbian lignite through utilization of low-rank coal upgrading technologies" in Chemical Engineering Research and Design, 92, no. 11 (2014):2383-2395,
https://doi.org/10.1016/j.cherd.2014.02.032 . .
18
16
16

Convective drying of particulate solids - Packed vs. fluid bed operation

Stakic, Milan; Stefanović, Predrag Lj.; Cvetinović, Dejan; Škobalj, Predrag D.

(2013)

TY  - JOUR
AU  - Stakic, Milan
AU  - Stefanović, Predrag Lj.
AU  - Cvetinović, Dejan
AU  - Škobalj, Predrag D.
PY  - 2013
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/5368
AB  - The paper addresses results for the case of convective drying of particulate solids in a packed and in a fluid bed, analyzing agreement between the numerical results and the results of corresponding experimental investigation, as well as the differences between packed and fluid bed operation. In the fluid bed simulation model of unsteady simultaneous one-dimensional heat and mass transfer between solids, gas phase and bubble phase during drying process, based on two-phase bubbling model, it is assumed that the gas-solid interface is at thermodynamic equilibrium. The basic idea is to calculate heat and mass transfer between gas and particles (i.e., the drying process) in suspension phase as for a packed bed of particles, where the drying rate (evaporated moisture flux) of the specific product is calculated by applying the concept of a drying coefficient. Mixing of the particles (i.e., the impact onto the heat and mass transfer coefficients) in the case of fluid bed is taken into account by means of the diffusion term in the differential equations, using an effective particle diffusion coefficient. Model validation was done on the basis of the experimental data obtained with narrow fraction of poppy seeds characterized by mean equivalent particle diameter (d(s.d) = 0.75 mm), re-wetted with required (calculated) amount of water up to the initial moisture content (X-0 = 0.54) for all experiments. Comparison of the drying kinetics, both experimental and numerical, has shown that higher gas (drying agent) temperatures, as well as velocities (flow-rates), induce faster drying. This effect is more pronounced for deeper beds, because of the larger amount of wet material to be dried using the same drying agent capacity. Bed temperature differences along the bed height are significant inside the packed bed, while in the fluid bed, for the same drying conditions, are almost negligible due to mixing of particles. Residence time is shorter in the case of a fluid bed drying compared to a packed bed drying. (C) 2012 Elsevier Ltd. All rights reserved.
T2  - International Journal of Heat and Mass Transfer
T1  - Convective drying of particulate solids - Packed vs. fluid bed operation
VL  - 59
SP  - 66
EP  - 74
DO  - 10.1016/j.ijheatmasstransfer.2012.11.078
ER  - 
@article{
author = "Stakic, Milan and Stefanović, Predrag Lj. and Cvetinović, Dejan and Škobalj, Predrag D.",
year = "2013",
abstract = "The paper addresses results for the case of convective drying of particulate solids in a packed and in a fluid bed, analyzing agreement between the numerical results and the results of corresponding experimental investigation, as well as the differences between packed and fluid bed operation. In the fluid bed simulation model of unsteady simultaneous one-dimensional heat and mass transfer between solids, gas phase and bubble phase during drying process, based on two-phase bubbling model, it is assumed that the gas-solid interface is at thermodynamic equilibrium. The basic idea is to calculate heat and mass transfer between gas and particles (i.e., the drying process) in suspension phase as for a packed bed of particles, where the drying rate (evaporated moisture flux) of the specific product is calculated by applying the concept of a drying coefficient. Mixing of the particles (i.e., the impact onto the heat and mass transfer coefficients) in the case of fluid bed is taken into account by means of the diffusion term in the differential equations, using an effective particle diffusion coefficient. Model validation was done on the basis of the experimental data obtained with narrow fraction of poppy seeds characterized by mean equivalent particle diameter (d(s.d) = 0.75 mm), re-wetted with required (calculated) amount of water up to the initial moisture content (X-0 = 0.54) for all experiments. Comparison of the drying kinetics, both experimental and numerical, has shown that higher gas (drying agent) temperatures, as well as velocities (flow-rates), induce faster drying. This effect is more pronounced for deeper beds, because of the larger amount of wet material to be dried using the same drying agent capacity. Bed temperature differences along the bed height are significant inside the packed bed, while in the fluid bed, for the same drying conditions, are almost negligible due to mixing of particles. Residence time is shorter in the case of a fluid bed drying compared to a packed bed drying. (C) 2012 Elsevier Ltd. All rights reserved.",
journal = "International Journal of Heat and Mass Transfer",
title = "Convective drying of particulate solids - Packed vs. fluid bed operation",
volume = "59",
pages = "66-74",
doi = "10.1016/j.ijheatmasstransfer.2012.11.078"
}
Stakic, M., Stefanović, P. Lj., Cvetinović, D.,& Škobalj, P. D.. (2013). Convective drying of particulate solids - Packed vs. fluid bed operation. in International Journal of Heat and Mass Transfer, 59, 66-74.
https://doi.org/10.1016/j.ijheatmasstransfer.2012.11.078
Stakic M, Stefanović PL, Cvetinović D, Škobalj PD. Convective drying of particulate solids - Packed vs. fluid bed operation. in International Journal of Heat and Mass Transfer. 2013;59:66-74.
doi:10.1016/j.ijheatmasstransfer.2012.11.078 .
Stakic, Milan, Stefanović, Predrag Lj., Cvetinović, Dejan, Škobalj, Predrag D., "Convective drying of particulate solids - Packed vs. fluid bed operation" in International Journal of Heat and Mass Transfer, 59 (2013):66-74,
https://doi.org/10.1016/j.ijheatmasstransfer.2012.11.078 . .
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