| abstract |
PROBLEM TO BE SOLVED: To reduce the addition amount of a highly corrosive mercury halogenating agent while maintaining high mercury removal efficiency in exhaust gas treatment. SOLUTION: A mercury halogenating agent 40 and ammonia 30 are added to a boiler combustion exhaust gas containing NO x , SO x and mercury and brought into contact with a CO and HC oxidation catalyst 50, and then reductive denitration 60 is performed in the presence of a solid catalyst. At the same time, metallic mercury is oxidized to mercury halide, and then wet desulfurized 100 with an alkali absorbing solution and mercury halide is removed. [Selection] Figure 1 |