GAS-SOLIDS CIRCULATING FLUIDIZATION IN A PACKED-BED

Gas-solid-solid circulating fluidized bed is a novel gas-solid contact or which offers interesting heat and mass transfer properties. In this type of equipment, large particles (often used as the catalyst) are f ixed in the bed forming a packing section while fine powders (often us ed as the absorbent or heat carrier) are carried by the gas and flow t hrough the packing. In this paper, the pressure gradient and powder ho ld-up in the packing have been measured in a rectangular fluidized bed . A theoretical analysis for the prediction of pressure drop, which is caused by the powder hold-up and the friction between gas and packing and between powders and packing, has been proposed. The predicted res ults agree well with the experimental results.