The objective of this study was to evaluate the general nature of solids flow in a 30-cm-id recirculating fluidized bed using silica sand. A bubbling or turbulent bed with a density of 1/2pb was observed in the lower part of the reaction and a pneumatic transport phase with a density of 1/100pb was observed in the upper part. The solids feed rate was regulated by a nonmechanical valve called an "l- valve." The maximum solids feed rate through the l-valve is limited by the head of solids in the downcomer. The saturated solids carryover rate was found to be proportional to the fourth power of the gas velocity. Recommendations for further studies and modifications to the system are presented.
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