Patent ID: 6491885
Filing Date: 2002-12-10
Classification: B01D,C01C

Abstract:
A combusted exhaust gas processing method for denitration by passage of a combusted exhaust gas in a denitration device using ammonia, and adding ammonia for neutralizing sulfuric acid and sulfuric anhydride, which comprises installing a reducing agent decomposing reactor provided with a contact hydrolysis catalyst layer containing at least one catalyst selected from the group consisting of carbonates and silicates of alkaline metals as a main component in the front flow of the denitration device disposed at a part with a 200 to 450Â° C. exhaust gas temperature in a flue, supplying an aqueous solution of urea to the reducing agent decomposing reactor for the contact hydrolysis to generate ammonia, adding the generated ammonia in the exhaust gas by the front flow of the denitration device for the denitration, and introducing a part of the ammonia to a part with a 100 to 200Â° C. exhaust gas temperature in a back flow of the denitration device so as to be sprinkled in the exhaust gas for neutralizing the sulfuric acid and the sulfuric anhydride.