Patent ID: 7906090

Claim:
A mercury reduction system that reduces nitrogen oxide and mercury in flue gas discharged from a boiler, the mercury reduction system comprising: a liquid material spraying unit that sprays a liquid material obtained by dissolving an oxidation-reduction agent reducing nitrogen oxide in the flue gas by a denitration catalyst and oxidizing mercury in a presence of hydrogen chloride, into a flue of the boiler in a liquid state; a gaseous material spraying unit that is provided downstream of the liquid material spraying unit, and sprays at least one of a reducing agent reducing nitrogen oxide in the flue gas by the denitration catalyst and a mercury chlorinating agent oxidizing mercury in the flue gas in the presence of the hydrogen chloride by the denitration catalyst or both of them into the flue as a gaseous material; a reduction denitration apparatus that includes the denitration catalyst reducing nitrogen oxide in the flue gas with ammonia, and oxidizing mercury in the presence of the hydrogen chloride; and a wet desulfurization apparatus that reduces mercury having been oxidized by the reduction denitration apparatus with an alkali absorbent.