Journal
CHEMICAL ENGINEERING SCIENCE
Volume 64, Issue 20, Pages 4302-4316Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2009.07.003
Keywords
Fluidization; Segregation efficiency; Binary particles; Turbulent fluidized bed; CFD
Categories
Funding
- National Natural Science Foundation of China [20490202]
- Distinguished Young Scholars of China [20525621, 20725620]
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The hydrodynamics of binary mixture of Geldart Group A and D particles in a turbulent fluidized bed were investigated by experiment and computational fluid dynamics (CFD) method in this paper. The results showed that at low gas velocity, the binary mixtures tend to segregate. At moderate gas velocity, they incline to mix well in the dense phase. Further increasing gas velocity, small particles are entrained and accumulate in the upper regime of the bed, and a segregation trend of the binary mixture appears again. At high gas velocities, segregation efficiency in the continuous classification process increases with increasing the gas velocity and mean residence time of the binary mixture, however, decreases with increasing the small particle content. A strong particle recirculation appears all over the dense phase of the bed. causing an approximately uniform solid composition in radial direction of the fluidized bed. (C) 2009 Published by Elsevier Ltd.
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