The pressure drop characteristics through a solid-particles moving bed using mechanical agitators are influenced by various factors such as the physical properties of the solid particles, the agitator geometry and the operating conditions. The present paper describes the results of an experiment on the relationship beween the pressure drop and the factors in the moving bed with solid-air counter-current flow. The bed is operated at an air velocity less than minimum fluidization velocity umf. A double herical ribbon is employed as an impeller.
The decrease in pressure drop with increase in the void fraction due to solids moving downward and agitation has been measured by using pressure sensing sets along the column height.
A general correlating equation for the pressure drop of the solid-gas moving bed has been provided in terms of the pitch ratio of the impeller, its width ratio its spacing distance and the gas flow rate and the rotary speed of the impeller.
