Effects of Particle Circulation and Residence Time on Coating Efficiency in a Circulating Fluidized Bed

Abstract

Coating of glass beads with silica powder was carried out using a circulating fluidized bed. Glass beads and silica powder were chosen because they were almost spherical in shape. In this paper, the effect of riser height on the coating efficiency was mainly discussed. Coating efficiency in circulating fluidized bed coater was a function of the residence time of core particles in the riser when the residence time was relatively short. On the other hand, when the residence time was longer, the coating efficiency was a function of the circulation time of particles.