Particle Size Control by Torque and Stress Measurement in Fluidized Bed Drying and Granulation from Solutions

Talu, I. and Gyenis, János and Tardos, G. I. and Dencs, B. (2000) Particle Size Control by Torque and Stress Measurement in Fluidized Bed Drying and Granulation from Solutions. In: AIChE 2000 Annual Meeting, 2000.11.12-2000.11.17., Los Angeles, Amerikai Egyesült Államok.

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Abstract

The fluidized bed process presented in this paper is suitable for recovery of solids from solutions in the form of granules. The solution is sprayed into the bed and as solvent evaporates, solid material is deposited on the surface of fluidizing particles. During this process, particle growth takes place by surface layering and/or agglomeration. A special grinder is used in the fluidized bed to control particle growth by causing selective disintegration of large particles. For steady state operation, the most important task is to determine the existing particle size distribution in the fluidized bed. A special method was developed to measure torque and stress fluctuations* in the bed of particles. Using a correlation between torque and stress fluctuations and particle size, this method and device can be used for direct control of the rotation speed of the grinder to produce granules of given size in the fluidized bed. Results of torque and stress measurements and their correlation to particle size are presented.

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