APPARATUS AND METHOD FOR TREATING FLUE GAS COMING FROM COMBUSTION APPARATUS OF OXYGEN COMBUSTION TYPE, AND WET-TYPE METHOD AND APPARATUS FOR DESULFURIZING FLUE GAS FOR USE THEREIN

摘要

PROBLEM TO BE SOLVED: To provide an apparatus and a method for treating a flue gas coming from a combustion apparatus of an oxygen combustion type wherein nitrogen discharged from an oxygen production device constituting an oxygen combustion system is actively used to enhance the capability of removing SOpresent in the flue gas, and a wet-type method and apparatus for desulfurizing a flue gas for use therein.SOLUTION: The wet type apparatus 3 and method for desulfurizing a flue gas include a desulfurization/absorption section 26 wherein combustion exhaust discharged from a boiler 13 of an oxygen combustion type that uses a gas of a high oxygen concentration obtained by separating nitrogen from oxygen as a gas for use in combustion, and introduced thereinto is brought into gas-liquid contact with slurry comprising a desulfurizing agent; an absorption liquid storage section 11 disposed in the lower part of the desulfurization/absorption section 26, wherein the desulfurizing absorption liquid having been brought into gas-liquid contact with the combustion exhaust is briefly stored to oxidize sulfites present in the desulfurizing absorption liquid by feeding oxidation air thereinto; and a cooling means 31 of cooling the desulfurizing absorption liquid, wherein the nitrogen separated from air is used as a coolant. The apparatus and the method for treating a flue gas coming from a boiler of an oxygen combustion type, employ the above apparatus and method respectively.