The effect of soot on radiative heat transfer and NO_x formation in high-temperature furnaces is discussed. Soot has been modelled using different formation and oxidation models. Results obtained with these models are compared to values inferred from spectral radiation measurements carried out in an experimental furnace. In general the soot formation models that are examined yield similar results. Also little difference is found between the three soot oxidation models. The predicted NO_x emission of a slowly mixing, relatively strongly sooting flame is reduded by almost 35 percent when accounting for soot. For an underport flame, which is much less sooty, still a decrease of 10 percent in predicted NO_x emission has been found. For both flames the agreement between simulations and experiment concerning NO_x emission and temperature prediction improves when taking soot into account.
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