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The influence of the number of gray gases in the weighted sum in the gray   gases model on the calculation of the radiative heat transfer is discussed in   the paper. A computer code which solved the set of equations of the   mathematical model describing the reactive two-phase turbulent flow with   radiative heat exchange and with thermal equilibrium between phases inside   the pulverized coal-fired furnace was used. Gas-phase radiative properties   were determined by the simple gray gas model and two combinations of the   weighted sum of the gray gases models: one gray gas plus a clear gas and two   gray gases plus a clear gas. Investigation was carried out for two values of   the total extinction coefficient of the dispersed phase, for the clean   furnace walls and furnace walls covered by an ash layer deposit, and for   three levels of the approximation accuracy of the weighting coefficients. The   influence of the number of gray gases was analyzed through the relative   differences of the wall fluxes, wall temperatures, medium temperatures, and   heat transfer rate through all furnace walls. The investigation showed that   there were conditions of the numerical investigations for which the relative   differences of the variables describing the radiative heat exchange decrease   with the increase in the number of gray gases. The results of this   investigation show that if the weighted sum of the gray gases model is used,   the complexity of the computer code and calculation time can be reduced by   optimizing the number of gray gases. [Projekat Ministarstva nauke Republike   Srbije, br. TR-33018: Increase in energy and ecology efficiency of processes   in pulverized coal-fired furnace and optimization of utility steam boiler air   preheater by using in-house developed software tools

thermal science/thermal science

Influence of the gray gases number in the weighted sum of gray gases model on the radiative heat exchange calculation inside pulverized coal-fired furnaces