Abstract
The prediction of performance of industrial furnaces is conventionally estimated by making gross assumptions as to the effect of temperature variations in the gas. The zone method of allowing for the effect, on radiative transfer, of the temperature variation in furnace enclosures has been applied to the problem of interaction between radiation and other modes of heat transfer. The effect of different flow patterns on the gas temperature-field and wall-flux distribution in a cylindrical furnace has been examined by use of the following flow models : plug flow ; parabolic velocity profiles ; ducted-jet flow (axial feed) with recirculation rates of 0, 1, and 11 times the flue-gas flow rate. A sixteenfold range of diameters and firing densities was studied. The reduced efficiencies were correlated, for a fixed surface temperature and for each of the flow models, in terms of a reduced firing rate. The wide range of heat flux distribution patterns found in the study emphasizes the need to include allowance for gas temperature variation in any furnace analysis in which the heat flux pattern is important.
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