SYSTEM FOR REMOVING MERCURY AND METHOD OF REMOVING MERCURY FROM MERCURY-CONTAINING HIGH-TEMPERATURE DISCHARGE GAS

摘要

A mercury reduction system 10A according to the present embodiment is a mercury reduction system that reduces NOx and Hg in flue gas 12 discharged from a boiler 11, and includes a chemical supplying unit 19A that mixes an NH 4 Cl solution 14, an NH 3 solution 15, and an HCl solution 16 in liquid states, and supplies a mixed solution 17 into a flue 18 provided downstream of the boiler 11, a reduction denitration apparatus 20 that includes a denitration catalyst reducing NOx in the flue gas 12 with NH 3 and oxidizing Hg in the presence of HCl, and a wet desulfurization apparatus 25 that reduces Hg oxidized in the reduction denitration apparatus 20 with limestone-gypsum slurry 24.