Studies on Heat Transfer in Fluidized Catalyst Beds

Abstract

Heat transfer between the fluidized solid bed and the tube wall is important in designing reaction vessels. This report shows some studies on heat transfer in fluidized beds. In §1, some solid particles, same in diameter but different in density, were used as fluidized solid, and variation of heat transfer film coefficient under the influence of air velocity was measured.Tendency of heat transfer coefficient was found to depend mostly on the following conditions-transition state, fluidized beds and transportation. It was observed that the fluidized state, independent of either solid density or particle diameter etc., counted most in heat transfer coefficient. In §1, a fluidizing tube of somewhat larger diameter was used to decrease slugging motion and to measure horizontal temperature distribution; and heat transfer coefficient was measured using different kinds of solid particles.An empirical formula for calculating heat transfer coefficient of fluidized beds is as follows:For notation, refer to table 3.