Experimental study of optimizing of penetration depth of fuel gun in low NOx flat flame combustion

摘要

The test model of high-swirl flat flame heating furnace burning liquefied petroleum gas was established. By adjusting four groups of penetration depth of fuel gun which was in the axis of the burner, the mixed state of fuel and combustion-supporting air was changed. The law of the effect of the temperature of fume on the top of furnace and the temperature of heated plate on the concentration of NOx in fume of tail flue was analyzed. The research of the optimum penetration depth of fuel gun to achieve low NOx emission was carried out. It is indicated that, with the increase of penetration depth of fuel gun, the concentration of NOx emission decreased in a large range. Under the condition of meeting a certain heating ability, the concentration of NOx was lower than the discharge limits 240 mg/Nm3 when the penetration depth of fuel gun was in the range of 0.07m to 0.15m.