Track: Waste Management
Abstract
Discharge times, tD, of sub-micron ultrafine and micron-size superfine powders from a circulating fluidized bed (CFB) with the cyclone upside stream were investigated using a Geldart A-C mixture of ultrafine and superfine Al(OH)3 powders and coarse FCC particles. tD which refers to the time needed for complete depletion of the fine powders contents from the fluidizing system.
Variation of discharge times of ultrafines and superfines with the equilibrium water content of FCC particles was investigated at a 5 wt% maximum loading of ultrafines and superfines. The superfines discharge times decreased noticeably using bed particles humidified with gas of higher (larger than 50%) relative humidity. Bed particles humidified using lower (35%) relative humidity showed very high discharge times at higher contents of fines. Relatively larger discharge times of the cohesive ultrafines were measured compared with those of the less cohesive superfines.