Effect of Recirculated Flue Gas Position on Combustion and NO Emission for High Temperature Air Combustion

High temperature air combustion (HTAC) technology is a high efficient, low pollution of combustion technology being widely studied. The mathematical model for HTAC is built and the effect of recirculated flue gas position on combustion and NOx emission is investigated by using numerical simulation. The results show that recirculated flue gas can effectively reduce the oxygen concentration in combustion air. With the change of recirculated flue gas position, the furnace temperature and NOx concentration are changed, and the both appear peak values when the position is at the middle section of furnace. The beginning section of the furnace is an ideal position of recirculated flue gas to be chosen for low NOx emission, however, the end section is good for temperature uniformity.