Flue gas treatment method and denitration/so3 reduction apparatus

Abstract

The present invention provides a flue gas treatment method and a denitration and SO3 reduction apparatus configured to efficiently reduce the concentration of SO3 in a combustion flue gas and also efficiently reduce NOx in the combustion flue gas at treatment costs lower than those of conventional methods. The flue gas treatment method performs a treatment for reducing SO3 into SO2 by adding a compound including the elements H and C to a combustion flue gas including SO3 as well as NOx 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.

Dependencies are inferred from the claim text.