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Two phase flow modeling in circulating fluidized bed for different number of solid fractions and different geometry configurations

Fuzowski K., Stelmachowski M.

Archives of Thermodynamics

2006

Vol. 27, no. 4

99-110

Results of modeling of two phase gas-solid flow hydrodynamics in a fluidization column and column - cyclone - recirculation system are discussed in this study. A mathematical model is proposed implemented in FLUENT 6.2 commercial solver as well as in Kinetics Theory of Granular Flow. Simulation was carried out for several solid fractions. The influence is shown of an increased quantity of the solid fraction on stability circulation inside the column and external circulation in a complete system. Solid mass flux balance is presented in three characteristic points, and also the axial solid velocity distribution and solid volume fraction in the third characteristic column height. The proposed model predicts correctly the hydrodynamics of gas-solid flow in a circulating fluidized bed, with characteristic solid fluctuation and solid fraction distribution and velocity, observed also in a real laboratory column.