Heat Transfer Simulation in Circulating Fluidized Bed Boiler

Abstract

A computer program is developed to analyze two-dimensional coupled radiative and convective heat transfer in circulating fluidized bed boiler (CFBB). Based on bulk-density distribution obtained by solving one-dimensional gas and particle two-phase flow equations, radiative heat transfer in CFBB is analyzed by using a revised Monte Carlo method. Covective heat transfer between furnace walls and gas or particles are also considered by using Martin's model. The temperature profiles of gas and particles, and the wall heat flux distributions are obtained. The results approach to the Johnsson's experimental data when horizontal mixing of particles is considered. The effects of particle diameter on the bulk density and heat transfer in CFBB are also studied.