Abstract
An existing theoretical model for flow and combustion in swirling pulverized-coal flames is extended to include a stochastic simulation of particle dispersion and a more refined phenomenological model of coal devolatilization. The model is applied to predict the flow and combustion in the near-burner (ignition) zone of medium- and high-volatile bituminous-coal flames. The quality of the predictions is assessed by comparison with detailed measurements of flow pattern, gas temperature and gas composition. In general, the agreement between predictions and measurements is quite good. The predictions are more sensitive to the volatile yield than the kinetics of devolatilization, and relatively insensitive to the kinetics of char combustion. The effects of particle dispersion are significant for the medium-volatile-coal flame.
Published Version
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