Abstract
A model for the hydrodynamics of circulating fluidized beds is proposed. The model combines existing entrainment and bed expansion correlations with a system pressure balance. Starting from a knowledge of the powder size distribution, particle density, gas velocity, equipment geometry and solids inventory, the variation of voidage within the riser is predicted, together with distribution of solids between the riser and supply hopper (or ‘slow’ bed). Qualitative trends with gas velocity and solid circulation flux show good agreement with experiment, but better quantitative agreement must await the development of an improved correlation for entrainment.
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