Fluid-Bed Behaviour at Elevated Temperatures

Abstract

Fluidization characteristics were investigated at temperatures up to 960^°C. Bed voidage at minimum fluidizing velocity, c_mf, increased with increasing temperature in laminar flow conditions and remained constant when the flow was in the transitional to turbulent regime. Published correlations for the prediction of U_mf are inadequate for high temperature operations. Zabrodsky’s (193) correlation predicts maximum bed/surface heat transfer coefficients for gas flow in the laminar regime until the radiation component becomes significant above about 600°C.