hydrodynamics of a powder-particle spouted bed with bottom feeding of powders Conveyed by Spouting gas

摘要

Hydrodynamics of a powder-particle spouted bed (PPSB) with bottom feeding of fine powders conveyed by spouting gas has been investigated. Feeding of fine powders caused an increase in bed pressure drop, especially when a cohesive powder was fed. The minimum spouting velocity decreased with increasing feed rate of fines until a critical value, above which slugging occurred. Also, the fines became difficult to elutriate out of the PPSB when using a cohesive powder smaller than 40 μm. The elutriation rate constant and the mean residence time of fines in this study almost agreed with those obtained by top feeding.