A kinetic model is d e v e l o p e d for t h e drying of solids in fluidized b e d s , assuming a falling rate period following a constant rate period. Experimental d a t a obtained using b a t c h a n d continuous single a n d spiral fluidized b e d s are satisfactorily m a t c h e d with t h e assumed drying kinetics a n d t h e r e s i d e n c e time distribution of solids appropriate for t h e t y p e of dryer.
A model for drying solids in a batch fluidized bed is proposed assuming that the bed may be divided into a solids phase, an interstitial gas phase, and a bubble phase with mass and heat transfer between the phases. The model comprehensively considers the bubble size, the bubble rise velocity, and the bubble volume fraction and covers constant drying rate and falling drying rate periods. T h e predictions using the model are compared with the experimental data obtained in the present study covering a wide range in experimental conditions and the data reported in literature. Abstract published in Advance ACS Abstracts, December 15, 1993.
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