关键词: 旋流筛板, 流化床, 流动特性, 多相流模型, 数值模拟

Abstract: The computation fluid mechanics was used to simulate the fluidization characteristics in fluidized bed with tridimensional rotating sieve tray under different operation velocities (0.44~1.14 m/s) with using of Eulerian⁃Eulerian multiphase model. The progress of bubbles formation, growth and vanishing was studied by analyzing instantaneous solids volume fraction in the fluidized bed at different time under different velocity, velocity vector distribution map at different time, variation of solids volume fraction in the baffled bed at different position under different velocity and variation of solids volume fraction in the baffled bed at different time under different velocity. The simulation results showed that the calculated values were agreed well with experimental results，the average deviation between calculated data and the free bed data is 13.4%，that between calculated data and the sieve tray bed data is 7.59%. It indicated that the model can predict the fluidization characteristics of solid particles under different operating gas velocities and simulate the progress of bubbles formation, growth and vanishing. The spray phenomenon occurs in the upper region of the rotating sieve tray, forming a fountain with low solid volume fraction. The addition of rotating sieve tray can break big bubbles into small bubbles and strengthen gas⁃solid mixing.

Key words: Rotating sieve tray, Fluidized bed, Fluidization characteristics, Multiphase model, Numerical simulation