Patent ID: 6773555
Filing Date: 2004-08-10
Classification: B01D

Abstract:
A flue gas treatment method for removing sulfur oxides in flue gas using ammonia, said flue gas treatment method comprising:injecting ammonia into flue gas containing sulfur oxides to react sulfur oxides with ammonia to produce ammonium compounds containing ammonium sulfate; after said injecting step, irradiating the flue gas with an electron beam through a metal foil; after said irradiating step, recovering the produced ammonium compounds from the flue gas so that sulfur oxides and ammonia remain in the flue gas; circulating an absorption liquid; bringing the flue gas into contact with the absorption liquid after said recovering step to remove residual sulfur oxides and ammonia contained in the flue gas; cooling said metal foil with air; after said cooling step and before said bringing step, injecting the air into the flue gas; and oxidizing sulfite ions which are dissolved in said absorption liquid during said bringing step.