Cfd Analysis of Circulating Fluidized Bed Combustion

In this paper computational analysis of circulating fluidized bed combustion using the fluent software is analysed. This work is concerned about gas–solid two-phase mixtures flowing upwards through the fast beds. The procedures studied are applicable to all types of fluidized-bed boilers. The type of information resulting from various ways of analyzing the pressure and temperature in fluidized beds are discussed. This paper presents coal combustion in circulating fluidized bed and the k–є two-phase turbulence model was used to describe the gas–solids flow in a CFB. The analysis of coal combustion is done by discrete phase model (DPM) and non pre mixed combustion in species model .Predicting the performance of large scale circulating fluidized bed boilers requires reliable and efficient modeling tools. In a CFB furnace, the fuel, air, and other input materials are fed locally and the mixing of different reactants is limited. The particle size has taken 5 mm and fluidizing velocity (4-6) m/s. As a result of analysis, the variation in mean particle diameter and superficial velocity, does affect the temperature, pressure and turbulence kinetic energy in different mean fractions in the combustion zone. The average temperature is found around