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Lattice Monte Carlo simulation of single coal char particle combustion under oxy-fuel conditions

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Authors
Jovanović, Rastko D.
Marek, Ewa
Maletić, Slobodan
Cvetinović, Dejan
Marković, Zoran M.
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Abstract
A descriptive model for isolated char particle combustion under conventional and oxy-fuel conditions was developed. Suggested model is based on the percolation theory and Monte Carlo simulation technique. Char particle was modeled as a square lattice consisting of a large number of small sites. Sites correspond either to fixed carbon, ash, or pore, and they were distributed randomly inside char lattice using percolation concept, at the start of simulation. Random walk model was used to represent gaseous species diffusion through particle pores. Char combustion was modeled using power law Arrhenius model which assumes that reaction rate depends of particle temperature and oxygen partial pressure on particle surface. The main aim of the proposed model was to take into account influence of heterogeneous char particle structure to randomness of the char combustion process. The suggested models behavior was validated by qualitative comparison with experimental data obtained in single partic...le reactor. It was found that simulated combustion time, char burnout and particle temperature values are in good agreement with experimentally determined data. Special emphasis was given to the CO2 gasification reaction influence on char conversion and particle temperature values. Further development of the proposed model with appropriate simplifications would enable its inclusion in comprehensive CFD codes. (C) 2015 Elsevier Ltd. All rights reserved.

Keywords:
Char combustion / Oxy-fuel / Percolation theory / Monte Carlo simulation
Source:
Fuel, 2015, 151, 172-181
Projects:
  • RELCOM - Reliable and Efficient Combustion of Oxygen/Coal/Recycled Flue Gas Mixtures (EU-268191)
  • Pollution Reduction from Thermal Power Plants of the Public Enterprise “Electric Power Industry of Serbia” (RS-42010)
  • Domestic Lignite Quality and Combustion Technology Enhancement for Energy Efficiency Increase and Reduction of Harmful Gases and Particulate Matter Emissions from Thermal Power Plants of Public Enterprise ”Electric Power Industry of Serbia” (RS-33050)
  • Advanced analytical, numerical and analysis methods of applied fluid mechanics and complex systems (RS-174014)
  • (Polish) National Research Development Centre [SP/E/2/666420/10]
Note:
  • 10th European Conference on Coal Research and its Applications(10th ECCRIA), Sep 15-17, 2014, Univ Hull, Kingston upon Hull, England

DOI: 10.1016/j.fuel.2015.02.104

ISSN: 0016-2361; 1873-7153

WoS: 000351711500021

Scopus: 2-s2.0-84939985892
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URI
http://vinar.vin.bg.ac.rs/handle/123456789/7066
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