Flow Properties of Moving-Fluidized Bed with Inclined Baffle Plates.

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Abstract

The behaviors of particles in a gas-solid contactor with inclined baffle plates that form a zig-zag path are experimentally studied. To improve the gas-solid contact efficiency, a table discharger is installed at the bottom of the column. In this contactor solid particles slide down along the baffle plates and are fluidized at the openings between the wall and the edge of the baffle plates by the upflowing gas. This structure, called a “moving-fluidized bed”, has some of the advantages of both moving and fluidized beds.<BR>The feed rate of solid particles, the open spacing fraction and the inclination angle of the particle reflector were chosen as parameters for experimental conditions. The formation of bubbles was observed between the fluidized bed and moving bed regions and the bubble diameters were measured by using fiber optic probes. Particle velocities in the moving bed region along the baffle plate were measured as a measure of the circulating motion of the particles in the moving and fluidized bed region. It is concluded that the present apparatus performs at a high efficiency of gas-solid contact under dense flow conditions, as compared with a gas-solid contactor which was used in our earlier study.

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