BEHAVIOR OF POWDERS IN A PACKED-BED WITH LATERAL INLETS

This study is to clarify the flow characteristics and hold up behavior of powders in a packed bed with lateral inlets through which gas and powders are injected. The experiments were carried out for two kinds o f the packed particles and powders. Longitudinal and radial distributi ons of powder hold up as well as longitudinal distribution of pressure in the packed bed were measured. It was found that more powders depos ited in the lower part, especially in the lower central part of the pa cked bed and that the total hold up of powders increased with the incr ease in the diameter of the packed particles. No blockade occurred for powders of 98 and 175 mum under the experimental conditions. The gas and powder two-phase flow in the packed bed was simulated by a two-dim ensional mathematical model considering gravitational force, the inter action forces between gas and the packed particles, gas and powders, a nd powders and the packed particles. The effect of static hold up of p owders on the voidage of the packed bed was reflected in computations through the trial and error approach according to the experimental dat a of total hold up of powders. The pressure distribution computed by t he mathematical model has good agreement with the observed one, and so that the static and dynamic hold ups of powders obtained are reasonab le.