Abstract
The study of the combustion and thermal flow of a pulverized coal combustion furnace was investigated. Three types of bituminous coal were fed into the combustion chamber without mixing. These coals were different in components, physical and chemical properties, which causes non-uniform combustion. Of interest is how to feed these different types of coal into the furnace. The aim of this work is to study the effect of the feeding pattern on the combustion efficiency using a computational fluid dynamics (CFD) technique, FLUENT 12, a commercial CFD code. The Finite Volume Method (FVM) was applied and the turbulence was modelled by the realizable k-( model. The effects of the feeding pattern on combustion efficiency were carried out. Six examples of coal feeding patterns with equivalent coal feed rate were simulated. It was found that feeding coal with a higher fixed carbon content at the top position yielded higher thermal efficiency and also released minimum flue gases (SO2, CO2).
