The principles underlying radiant heat transfer in boiler furnaces are fundamentally simple, but their application requires a knowledge of empirical quantities describing the emissivity of the flame and the boiler surfaces and the relationship between their geometries.
This paper draws attention to the dependence of local heat release rates on fuel/air mixing. In the case of a downshot coal-fired furnace, the performance of which was investigated in detail, the size and position of the effective flame envelope could be derived from a knowledge of the flow and mixing rates. These in turn should be capable of being measured on isothermal models, and research should be directed to this end.
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