A mercury removal system 10 / b A according to the present embodiment is a mercury removal system that removes NOx and Hg contained in high-temperature exhaust gas 12 from a boiler 11, and sprays an NH 4 Cl solution 14 into a flue 13 of the boiler 11. The NH4Cl supply unit 15A, the NOx in the high-temperature exhaust gas 12 is reduced with NH3, and the reduction denitration device 16 has a denitration catalyst that oxidizes Hg in the presence of HCl, and the Hg oxidized in the reduction denitration device 16 is lime gypsum slurry 19 and a wet desulfurization apparatus 20 to be removed. The NH 4 Cl supply unit 15 A is inserted into the flue 13 so as to surround the NH 4 Cl solution supply pipe 33 and supply the air 34 to the flue 13. And a two-fluid nozzle 37 that is attached to the tip of the NH 4 Cl solution supply pipe 33 and injects the NH 4 Cl solution 14. The NH4Cl solution 14 ejected from the two-fluid nozzle 37 is sprayed as fine droplets.
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