The Babcock & Wilcox Company

Mcdermott Technology, Inc.

Other

Paul S Nolan

William Downs

Ralph T Bailey

Stanley J Vecci

Gerald T Amrhein

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.

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

Chlorine and sulfide species are separately introduced to a flue gas passing through a scrubber in order to remove the elemental and oxidized mercury from the gas through the precipitation of mercuric sulfide at near 100% efficiency.

Method for controlling elemental mercury emissions

A combined removal system for separating carbon dioxide and sulfur oxide gases from furnace flue gases employs a single vessel having two chambers. The chambers are separated by a series of baffles and drains. The lower, primary chamber contains reagent and a delivery system for removing sulfur oxides (SO and SO ) from the flue gases. The upper, secondary chamber has a reagent, typically an amine solution, for removing carbon dioxide from the flue gases. The baffles and drains permit the flue gases to rise from the primary chamber into the secondary chamber, while collecting the amine solution which is used to trap the carbon dioxide. Alternatively, the primary and secondary chambers may be separated by a horizontal segment or a combination of horizontal and vertical sections.

Combined flue gas desulfurization and carbon dioxide removal system

An apparatus and method for measuring the wet and dry bulb temperatures of a hot flue gas stream containing fly ash and particulates by providing a sample sheath (12) in a gas duct (10) with a dry bulb sensor (16) and a wet bulb sensor (18) located within the sample sheath (12). The sample sheath (12) includes a self-cleaning dust filter (14) which removes the ash and particulates from the flue gas stream and a self-regulating water reservoir (26, 28) to continuously supply water for the wet bulb sensor (18).

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North Canton, OH, United States of America

Paul S Nolan