Chapter 2 Selective Catalytic Reduction
relatively low emissions on their own. The outlet concentration from SCR on a utility boiler is rarely less than 0.04 lb/million British thermal units (MMBtu) [1].2 In comparison, SNCR units typically achieve approximately 25 to 75 percent reduction efficiencies [5]. Either ammonia or urea may be used as the NO x reduction reagent in SCR ...
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