Mercury reduction system

Details Mercury reduction system Mercury reduction system

2009-12-17

2011-12-06

Warden, Jill (Department: 1773)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

C422S111000, C422S169000

Reexamination Certificate

active

08071036

ABSTRACT:
A mercury reduction system includes an NH4Cl supplying unit that sprays an NH4Cl solution into a flue of the boiler, a reduction denitration apparatus that includes a denitration catalyst for reducing NOx in the flue gas with NH3and oxidizing Hg in the presence of HCl, and a wet desulfurization apparatus for reducing Hg oxidized in the reduction denitration apparatus with limestone-gypsum slurry. The NH4Cl supplying unit includes an NH4Cl solution feed pipe that supplies the NH4Cl solution into the flue in a liquid state, a blow pipe that is inserted into the flue so as to surround the NH4Cl solution feed pipe and through which air is injected into the flue, and a two-fluid nozzle that is fitted to an end of the NH4Cl solution feed pipe and through which the NH4Cl solution is injected. Through the two-fluid nozzle, the NH4Cl solution is injected and sprayed in fine liquid droplets. NH3is supplied by an ammonia supplying unit and HCl is supplied by a hydrogen chloride supplying unit wherein both units are located between the NH4Cl agent supplying unit and the reduction denitration apparatus.

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patent: 7670569 (2010-03-01), Higgins et al.
patent: 2007/0202020 (2007-08-01), Honjo et al.
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patent: 2001-198434 (2001-07-01), None
patent: 2007-167743 (2007-07-01), None
patent: 2008-221087 (2008-09-01), None

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