Effects of bluff-body burner and coal particle size on NOx emissions and burnout

Investigations on air staging have been carried out using various coals wit h different degrees of fineness and a variety of burners with a 92.9 kw h(- 1) tunnel furnace burning pulverized coal. It has been observed that using the bluff-body burner can reduce both the unburned carbon in fly ash and NO x emissions in the case of air staging. The experimental results show that air-staging combustion has a more remarkable effect on NOx reduction for hi gher-volatile coal than for lower-volatile coal. The results also show that there is a strong influence of coal particle size on NOx emissions and unb urned carbon in the fly ash in the case of air staging.