Method for reducing the mercury (hg) and other metal emissions from a plant for manufacturing cement clinker and other industrial processes
OwnerDavid G. Gossmaninventor
Life of this patent
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Abstract
A method and plant for reducing mercury (Hg) and other metal emissions including injecting a chemical reagent into the process in such a way as to convert elemental mercury into a mercury compound that is more readily captured using normal particulate control equipment associated with kilns, smelters, furnaces, and boilers of cement plants and other industrial plants.
Claims22
A method for reducing the mercury emission from a plant for manufacturing cement clinker by which cement raw meal is preheated and burned in the plant comprising a cyclone preheater and a kiln in communication with the cyclone preheater, the method comprising:
- introducing a sulfur generating or producing reagent into an uppermost or other cyclone stage of the cyclone preheater, the sulfur generating or producing reagent comprising at least one of a sulfide compound or elemental sulfur (S8), and the sulfur generating or producing reagent being present in solid or liquid form that thermally decomposes and vaporizes at a suitable temperature in the kiln;
- reacting with elemental mercury to form mercury sulfide;
- and
- allowing the mercury sulfide to be readily captured in particulate air pollution control equipment.
A method for reducing the mercury emission from a plant for manufacturing cement clinker by which cement raw meal is preheated and burned in the plant comprising a straight kiln, the method comprising:
- introducing a sulfur generating or producing reagent into the back end of the kiln, the sulfur generating or producing reagent comprising at least one of a sulfide compound or elemental sulfur (S8), and the sulfur generating or producing reagent being present in solid or liquid form that thermally decomposes and vaporizes at a suitable temperature in the kiln;
- reacting with elemental mercury to form mercury sulfide;
- and
- allowing the mercury sulfide to be readily captured in particulate air pollution control equipment.
A method for reducing the mercury emission from an industrial plant that combusts fuels, the method comprising:
- introducing a sulfur generating or producing reagent into the post combustion gasses, the reagent consisting essentially of at least one of a sulfide compound, and the reagent being present in solid or liquid form that thermally decomposes and vaporizes at a suitable temperature in the process to form gaseous elemental sulfur;
- reacting with elemental mercury to form mercury sulfide;
- and
- allowing the mercury sulfide to be readily captured in particulate air pollution control equipment.
Dependencies are inferred from the claim text.