Method for control of mercury

a technology for mercury and flue gas, applied in the field of mercury control, can solve the problems of difficult capture of elemental mercury, inability to collect and dispose of fly ash, etc., and achieve the effect of inherent safety advantag

Inactive Publication Date: 2005-08-04
DOWNS WILLIAM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016] The system has an inherent safety advantage in that no gas phase H2S

Problems solved by technology

Therefore, it cannot be collected and disposed of along with fly ash like the other metals.
It was generally expe

Method used

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  • Method for control of mercury
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Examples

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Embodiment Construction

[0025] Referring to the drawings generally, wherein like reference numerals designate the same or functionally similar elements throughout the several drawings, and to FIG. 1 in particular, FIG. 1 illustrates a coal-fired utility boiler installation of the type used by utilities in the generation of electric power, generally designated 10, and which represents one type of industrial process to which the present invention is applicable. In its broadest form, the present invention comprises a method for removing mercury from the flue gas generated during the combustion of fossil fuels or solid wastes through the use of trace amounts of hydrogen sulfide. Of course, while the aforementioned coal-fired utility boiler installations are but one example, and the method of the present invention will likely first find commercial application to the removal of mercury from the flue gases produced by such utility boiler installations which combust such fossil fuels, any industrial process using ...

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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.

Description

[0001] This is a divisional application of U.S. Ser. No. 09 / 894,558 filed Jun. 28, 2001, which is a divisional application of U.S. Ser. No. 09 / 282,817 filed Mar. 31, 1999, now U.S. Pat. No. 6,284,199 B1, and the text of the aforementioned patent applications are hereby incorporated by reference as though fully set forth herein.[0002] 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.FIELD AND BACKGROUND OF THE INVENTION [0003] The present invention relates generally to the field of combustion and flue gas cleanup methods and apparatus and, in particular, to a new and useful method and apparatus for removing mercury from the flue gases generated during the combustion of fossil fuels such as...

Claims

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Application Information

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IPC IPC(8): B01D47/06B01D53/64B01D53/78F23J15/00F23J15/02
CPCB01D47/06B01D53/64B01D53/78F23J15/003F23J2219/60F23J2215/60F23J2217/102F23J2219/40F23J15/02
Inventor DOWNS, WILLIAMBAILEY, RALPH T.
Owner DOWNS WILLIAM
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