Abstract
AbstractIn order to investigate the combustion characteristics of a two‐stage swirl‐flow fluidized bed combustor, combustion experiments of low‐grade anthracite coal were performed. Experimental parameters were the fluidizing air velocity, coal feed rates, bed temperature, stoichiometric air ratio, swirl nozzle diameter and rotational diameter. The experimental results showed that, due to the swirl flow, the elutriation rates of fines were lower than those of the single‐stage fluidized bed combustor. The combustible contents of the ash in the outflow streams were also reduced. Therefore, the combustion efficiency of the two‐stage swirl‐flow fluidized bed combustor was 20% greater than that of the single‐stage fluidized bed combustor under the same operating conditions.
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