Novel Fragmentation Model for Pulverized Coal Particles Gasification in Low Temperature Air Thermal Plasma
2016
Аутори
Jovanović, Rastko D.Cvetinović, Dejan
Stefanović, Predrag Lj.
Škobalj, Predrag D.
Marković, Zoran J.
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
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%.
Кључне речи:
Serbian lignite gasification / low temperature thermal plasma / CFD / particle fragmentation / modeling validationИзвор:
Thermal Science, 2016, 20, S207-S221Финансирање / пројекти:
- Смањење аерозагађења из термоелектрана у ЈП Електропривреда Србије (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-42010)
- Побољшање квалитета и технологије сагоревања домаћих лигнита у циљу повећања енергетске ефикасности и смањења емисије штетних материја из термоелектрана ЈП Електропривреда Србије (RS-MESTD-Technological Development (TD or TR)-33050)
Колекције
Институција/група
VinčaTY - JOUR AU - Jovanović, Rastko D. AU - Cvetinović, Dejan AU - Stefanović, Predrag Lj. AU - Škobalj, Predrag D. AU - Marković, Zoran J. PY - 2016 UR - https://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 J.", 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. J.. (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 ZJ. 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 J., "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 . .