Abstract
A model is proposed to represent the underfeed, fluidized coal combustor. Its assumptions are described and its mathematical representation developed. This model accounts for the possible rapid release of volatiles near the feed ports, particle reaction and shrinkage in the bed, elutriation of unburned fines and afterburning of volatiles above the bed. Design charts are then presented to predict the carbon efficiency of the combustor as well as the temperature jump above the bed in terms of the type of coal used, the number of feed ports in the bed, percentage excess air, gas velocity and the amount of secondary air needed to introduce the coal. As a special case, this model also represents the fluidized combustor with an overfeed of large coal particles or any combination of overfeed of large particles and underfeed of fines.
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