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Experimental Study of the Enhancement of the Selective Noncatalytic Reduction Denitrification Process with Methane and Propane in a Circulating Fluidized Bed

Selective noncatalytic reduction of NO with ammonia (NH3) as a reducing agent and methane (CH4) and propane (C3H8) as gaseous additives was studied using bench- and pilot-scale experimental setups. The performances of the two additives and their injection pathways were investigated and compared. As indicated by the bench-scale experiments, the NO conversion efficiency was significantly enhanced above 700 °C upon addition of CH4 and C3H8. The temperature window for high NOx conversion efficiency was extended downward from 900 to 750 °C and from 900 to 700 °C in the presence of CH4 (α = 0.5) and C3H8 (α = 0.2), respectively. When the additives and NH3 were injected simultaneously at the same location, the de-NO efficiency increased as much as 20% due to the formation of a reducing atmosphere, subsequently accelerating the generation of hydroxyl groups after the addition of additives, which induce the dehydrogenation of NH3 and accelerate the combination of NO with NH2 to generate N2 and H2O.