摘要 |
A system and a method for controlling NO<SUB>X </SUB>emissions from a boiler that combusts carbonaceous fuels. The method includes the steps of (a) introducing carbonaceous fuel and combustion air into a furnace of the boiler for combusting the carbonaceous fuel in oxidizing conditions and producing flue gas including NO<SUB>X </SUB>and CO, and (b) leading flue gas from the furnace to a catalyst section in a flue gas channel for converting, free from introducing an external agent for NO<SUB>X </SUB>reduction, NO<SUB>X </SUB>to N<SUB>2 </SUB>and CO to CO<SUB>2 </SUB>by using CO as the reductant of NO<SUB>X </SUB>on a catalyst in the catalyst section. |