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Solid suspension in a countercurrent flow bed

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image of Advanced Powder Technology

Gas and liquid velocities for particle suspension in a countercurrent flow bed, or countercurrent three-phase fluidized bed, were studied. In this system, solid particles are suspended in a continuous liquid phase by gas sparging, while the liquid is fed from the top countercurrent to the gas flow. The liquid level in the column is controlled by the use of a weir. By proper design of the gas distributor, the liquid can exit from the bottom of the column without entraining the particles. In this way, particles with low terminal velocity (i.e. fine or low-density particles) can be used in a continuous flow reactor system, which is batch-wise with respect to the solids, at high solids hold-up. Particle suspension was studied for both a low-density particle type and small-diameter particle type using air and water as the fluidizing media.

Affiliations: 1: Department of Chemical Engineering, The University of Tulsa, Tulsa, OK 74104, USA


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