Rates of Combustion and Elutriation in a Fluidized Bed Coal Combustion

An analysis of the unburned combustibles content in Taiheiyo coal-derived ash

Abstract

Mass utilization of coal requires ash disposal or utilization technology which is acceptable to modern society. A simple model is examined in this article for estimating unburned combustibles content in the ash produced from fluidized bed combustion.
Experiments were carried out burning Taiheiyo coal in a 10.8 cm I.D. fluidized bed. Overall combustion rate constant was obtained for coarser fraction, taking into account the particle residence time distribution. Elutriation rate constant was determined from the relation between combustibles content and particle size. The observed elutriation rate constant values were between those from Zenz et al. and Yagi et al. correlations.