Abstract
With increasing rates of pulverised coal injection into blast furnaces, it is important to understand the flow characteristics of unburned coal. Under some operating conditions, the coal powder can be stagnant in certain regions of the furnace and its permeability deteriorates. Thus a model studying the behaviour of unburned coal was produced. In the model, the coal burning in the raceway is affected by oxygen content and temperature of the gas. The simulation results demonstrate that the accumulation region of unburned coal is in the lower part of the inverse cohesive zone, above and under the tuyeres, and in the hearth centre.
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