cfd study on influence of fuel temperature on nox emission in a hitac furnace

the influence of the fuel temperature on nox formation was investigated numerically. for this purpose cfd modeling of nox emission in an experimental furnace equipped with high temperature air combustion (hitac) system was studied. the comparison between the predicted results and measured values have shown good agreement, which implies that the adopted combustion and nox formation models are suitable for predicting the characteristics of the flow, combustion, heat transfer, and nox emissions in the hitac chamber. moreover the predicted results show that increase of the fuel temperature results in a higher fluid velocity, better fuel jet mixing with the combustion air, smaller flame and lower nox emission.