95/06307 Effect of secondary superficial air velocity on the elutriation rate of fine particles in a cold-model two-stage swirl-flow fluidized-bed combustor

Abstract

The elutriation rate of fine particles were measured in a cold model Two-Stage Swirl-Flow Fluidized Bed Combustor(TSSF-FBC). The range of secondary air flow rate was varied from 0.1 m/s to 0.35 m/s while the primary air flow rate was kept to a constant value of 1 m/s. It was found that the elutriation rate of fine particles slightly increased with the secondary superficial air velocity. When the secondary superficial air velocity exceeded over 0.3 m/s, however, the elutriation rate rapidly increased. The elutriation rate of fine particles was strongly dependent upon the swirl intensity. It was exponentially decreased as the swirl intensity increased. The elutriation rate constant increased with the secondary superficial air velocity, and the critical particle diameters were in range of . Under the experimental conditions, the elutriation rate constant of fine particles can be correlated with secondary excess air velocity() and as follows;