Bubble sizes in a fluidized bed at elevated temperatures

Abstract

Observations were made of the minimum bubbling and minimum slugging velocities, and bubble sizes at 20, 200 and 300/sup 0/C in a bed of spherical steel shot. Under equivalent conditions of bed height and excess gas velocity at 200 and 300/sup 0/C, bubbles were 75 to 85 percent of the sizes at room temperature. This trend was confirmed by the finding that higher excess gas velocities were achieved before the bed started to slug. Minimum bubbling velocity appears less sensitive to temperature than minimum fluidization velocity values reported in the literature.