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The Effect of Swirling Flow on Elutriation in a Vortexing Fluidized Bed
Department of Chemical Engineering, Chung Yuan Christian University, Chung Li, Taiwan, R.O.C.
Korean Journal of Chemical Engineering, September 1999, 16(5), 654-658(5), 10.1007/BF02708147
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Abstract
The elutriation of fine particles in a vortexing fluidized bed (VFB) was studied by a batch and binary system. The diameter of the coarse particles was 545 ㎛, and the diameter of the fine particles for the elutriation test was 81, 97, 115, 163, and 193 ㎛, respectively. It was found that the swirling flow caused by the secondary air injection is the dominating factor to influence the elutriation rates. The effect of primary air velocity, swirling flow, injection angle of secondary air nozzle, and diameter of fine particles on the elutriation rate constant was also studied. The Taguchi experimental method and Regular analysis are used to identify the effects of various operating variables. A correlation was developed to estimate the specific elutriation rate constant (K∞*) in the vortexing fluidized bed. The specific elutriation rate constant (K∞*) was found to be a function of the primary air velocity, the diameter of fine particles, the secondary air velocity, and the height of secondary air injection.
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References
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Taguchi G, "Introduction to Quality Engineering, Asian Productivity Organization," Tokyo (1986)
Wan HP, Chyang CS, J. Chem. Eng. Jpn., 31(6), 977 (1998)
Wen CY, Hashinger RF, AIChE J., 6, 220 (1960)
