Abstract—The combustion of coal is used in circulating fluidized bed combustion system. This work is concerned about gas–solid two-phase mixtures flowing upwards through the fast beds. The type of information resulting from various ways of analyzing the pressure variations and the effect of superficial velocity on pressure in fluidized beds are discussed. This paper presents the standard k–є and two-phase turbulence model used to describe the gas–solids flow in a CFB.The analysis of temperature and density in coal combustion is done by discrete phase model (DPM) and non pre mixed combustion in species model through the PDF file creation in DPM model. The flow temperature and density in the system were modeled by solving the continuity and momentum equations of the gas flow by using the CFD analysis. The fluidizing velocity has been taken as 4 m/s and the effects of operating parameters on mole fraction, mean density and mean temperature are discussed in this paper. It is observed that the mean density of minimum and maximum mean mixture fraction along the scaled variance is significant.
Index Terms—Two-phase flow, discrete phase model, turbulence model, non-premixed model
The authors are with the Department, National Institute of Technology, Silchar, Assam, India.
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Cite: K.M.Pandey and Ravindra Kumar, "Numerical Analysis of Coal Combustion in Circulating Fluidized Bed," International Journal of Chemical Engineering and Applications vol. 2, no. 6, pp. 390-394, 2011.
