EXHAUST GAS TREATMENT METHOD AND DENITRIFICATION/SO3 REDUCTION APPARATUS

摘要

The present invention provides a flue gas treatment method and a denitration and SO 3 reduction apparatus configured to efficiently reduce the concentration of SO 3 in a combustion flue gas and also efficiently reduce NO x in the combustion flue gas at treatment costs lower than those of conventional methods. The flue gas treatment method performs a treatment for reducing SO 3 into SO 2 by adding a compound including the elements H and C to a combustion flue gas including SO 3 as well as NO x in an oxygen atmosphere as a first additive, and then by bringing the combustion flue gas into contact with a catalyst including an oxide constituted by one or more of elements selected from the group consisting of Ti, Si, Zr, and Ce and/or a mixed oxide and/or a complex oxide including two or more of the elements selected from the group as a carrier.