Solid Entrainment in Fluidized Bed Combustors

Abstract

The particle entrainment rate and the size distribution of entrained particles were determined in two large-scale fluidized bed combustors and a cold model fluidized bed. A model is developed to predict the particle entrainment rate in which the vertical velocity distribution of entrained solids at the bed surface is considered. The entrainment rate increases with increase in gas velocity and coal feed rate. The effect of gas velocity on the entrainment rate is less pronounced in the combustor than in the cold model fluidized bed. However, the vertical velocity of entrained particles at the bed surface of the combustors is higher than that in the cold model fluidized bed. © 1989, The Society of Chemical Engineers, Japan. All rights reserved.