Apparatus for control of mercury
AssigneeMcDermott Technology, Inc.
InventorsWilliam Downs, Ralph T. Bailey
Life of this patent
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Abstract
A method and apparatus for reducing mercury in industrial gases such as the flue gas produced by the combustion of fossil fuels such as coal adds hydrogen sulfide to the flue gas in or just before a scrubber of the industrial process which contains the wet scrubber. The method and apparatus of the present invention is applicable to installations employing either wet or dry scrubber flue gas desulfurization systems. The present invention uses kraft green liquor as a source for hydrogen sulfide and/or the injection of mineral acids into the green liquor to release vaporous hydrogen sulfide in order to form mercury sulfide solids.
Claims19
In an apparatus using a scrubber for receiving and scrubbing an industrial gas containing mercury with an aqueous alkali reagent, the improvement comprising:
- means for generating hydrogen sulfide including a tank means for providing an aqueous solution comprising sodium sulfide or an aqueous solution comprising potassium sulfide, an acid supply means for providing acid into the aqueous solution to generate hydrogen sulfide and means for supplying air to said tank means to produce a mixture of air and hydrogen sulfide;
- and means for supplying the mixture of air and hydrogen sulfide to the industrial gas upstream of the scrubber.
An apparatus for receiving and scrubbing an industrial flue gas containing mercury with an aqueous alkali reagent, comprising:
- a scrubber for scrubbing the industrial flue gas with the aqueous alkali reagent;
- flue means for conveying the industrial flue gas to the scrubber;
- means for generating hydrogen sulfide including a tank means for providing an aqueious solution comprising sodium sulfide or an aqueous solution comprising potassium sulfide, and alkali supply means for providing an alkali to the solutions, an acid supply means for providing acid into the aqueous solution to generate hydrogen sulfide and means for supplying air to said tank means to produce a mixture of air and hydrogen sulfide;
- and
- means for supplying the hydrogen sulfide into the industrial flue gas conveyed by the flue means.
Dependencies are inferred from the claim text.