EXPERIMENTAL AND THEORETICAL INFORMATION ON SOLID FLOW IN A CIRCULATING FLUIDIZED-BED

Data are presented on a laboratory-scale circulating fluidized bed for various column geometries, solid fluxes, and gas velocities. Particul ar attention is paid to the solid flux profiles under various operatin g conditions. A model based on the fundamental equations of motion has been developed to describe the flow patterns of the solids particles and gas within a circulating fluidized bed. The predictions of the mod el are compared with experimental results. The model predicts that ins tabilities at the base of the bed propagate up the column for signific ant distances before uniform flows of solids and gas are established.