A novel method for predicting the dynamic combustion performances of dense-phase zone in CFB furnace are proposed based on the improvements of the previous models. The coal particle heating process, the time delay and the subsequent heat release as raw coal with wide size distribution admitted into the furnace are adequately taken into account in the proposed model. The bed temperature responses to the variations of coal firing rates are predicted and compared to the measured data from a 220t/h CFB boiler.

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