Patent ID: 6363869
Filing Date: 2002-04-02
Classification: B01D,F23B,F23C,F23J,Y02A

Abstract:
A method for reducing nitrogen oxides (NOx) and/or sulfur oxides (SO2 and SO3) emissions from carbonaceous fuel combustion flue gases, said method comprising the steps of:a) introducing an aqueous potassium hydroxide solution into a flue gas contacting device upstream of a particulate control device wherein the said solution is atomized into the flue gas; b) providing a residence time in the flue gas contacting device that is sufficient to provide for said solution water evaporation and for reaction of said potassium hydroxide with acid gases contained in said flue gas to form potassium salts; c) removing said particulate that includes said potassium salts co-mingled with carbonaceous fuel fly ash from the flue gas by a particulate control device; and d) wherein a potassium hydroxide spray is injected into the flue gas stream to reduce sulfur trioxide in the flue gas to a level of 25 ppmv or less.