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Use of sulfide-containing liquors for removing mercury from flue gases

United States Patent

May 2, 2006
View the Complete Patent at the US Patent & Trademark Office
A method and apparatus for reducing and removing mercury in industrial gases, such as a flue gas, produced by the combustion of fossil fuels, such as coal, adds sulfide ions to the flue gas as it passes through a scrubber. Ideally, the source of these sulfide ions may include at least one of: sulfidic waste water, kraft caustic liquor, kraft carbonate liquor, potassium sulfide, sodium sulfide, and thioacetamide. The sulfide ion source is introduced into the scrubbing liquor as an aqueous sulfide species. The scrubber may be either a wet or dry scrubber for flue gas desulfurization systems.
Nolan; Paul S. (North Canton, OH), Downs; William (Washington Township, Stark County, OH), Bailey; Ralph T. (Uniontown, OH), Vecci; Stanley J. (Washington Township, Stark County, OH)
The Babcock & Wilcox Company (New Orleans, LA), McDermott Technology, Inc. (New Orleans, LA)
10/ 324,833
December 20, 2002
The subject matter of the present invention was developed under a research contract with the U.S. Department of Energy (DOE), Contract No. DE-FC22-94PC94251, and under a grant agreement with the Ohio Coal Development Office (OCDO), Grant Agreement No. CDO/D-922-13. The governments of the United States and Ohio have certain rights in the invention.