Abstract
The relevance of coal fragmentation and bed emissions of combustible gases on the performanceof the fluidized combustion of a coal and, in particular, on the elutriation rates of attrited carbon fines, is investigated for various coal feed sizes. Experimental data are compared with results of model calculations carried out with different assumptions as regards actual coal feed size distribution, because of fragmentation, and actual oxidizing conditions of the bed, owing to bed emissions of combustible gases subsequently burnt in the free board. Disregarding these phenomena results in model overestimations of elutriation rates of attrited carbon fines. Under the working conditions tested, discrepancies between calculation results and experimental observations are specially found when neglecting, at low excess air factors, the effects of bed emissions of combustible gases.
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