Patent ID: 8096268

Claim:
A method of lowering reactant requirements for selective non-catalytic reduction of NO x in a municipal solid waste fuel steam generator, comprising steps of: a) providing a furnace configured and adapted to generate a stream of furnace exit gas from combustion of municipal solid waste fuel, the furnace having at least one superheater disposed downstream of a combustion zone of the furnace, and at least one waterwall furnace platen disposed within the furnace upstream from the superheater; b) providing a selective non-catalytic reduction system operably connected to reduce NO x emissions from furnace exit gas; c) operating the furnace to generate steam from the super heater; d) operating the selective non-catalytic reduction system by reacting the furnace exit gas with a required amount of reactant to enhance NO x control to within acceptable limits; and e) reducing the required amount of reactant by circulating fluids through the at least one waterwall furnace platen to lower furnace exit gas temperature at the superheater.