Abstract
The frequency distribution of the heat-flow intensity on the furnace walls radiated by homogenous gases which completely fill the furnace does not coincide with the distribution in the actual furnaces as tested by the ASME Committee. In an ideal furnace with a point heat source at its center, however, the frequency distribution is very similar to that of the intensity of heat-absorption in an actual furnace, provided radiation from the point heat source and radiation from the homogenous gas are combined properly. Since the distribution in a burner-fired furnace is not affected by the form of furnace or operating conditions, this fact may well be utilized in deriving an improved method of calculating heat-absorption in boiler-furnaces. Effective thickness of the flame in boiler furnaces as calculated by the Hottel method gives larger value than the rigorously calculated thickness. This is especially the case in a large modern furnace or with the luminous flame or powdered-coal flame. In this paper, the coefficients which give correct beam length are presented graphically.
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