Nitrogen Oxide Concentration Conversion under Flue Gas Recirculation Conditions
Flue gas recirculation can effectively reduce nitrogen oxide emissions from industrial boilers.Because the O2 concentration of circulating flue gas is lower than air,mixing it with boiler flue gas will result in the inapplicability of the traditional nitrogen oxide concentration conversion formula.Based on the NO and O2 conservations and the simplified treatment of circulating flue gas parameters,this article researches and rederives the NO concentration conversion formula under flue gas recirculation conditions.It is found that the new conversion formula has an additional(1+k/100)term compared with the tradi-tional formula,indicating that the converted NO concentration is proportional to the flue gas recirculation rate(k).The new conversion formula can objectively and fairly evaluate the low nitrogen transformation effect of flue gas recirculation.It also applies to the conversion and evaluation of other nitrogen oxides,particulate matter,sulfur dioxide,and mercury compounds.
industrial boilerlow nitrogenflue gas recirculationnitrogen oxideconcentration conversion
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