Method of removing mercury from flue gas through enhancement of high temperature oxidation
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United States of America Patent
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Issued Date -
Feb 9, 2006
app pub date -
Aug 3, 2004
filing date -
Aug 3, 2004
priority date (Note) -
Abandoned
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Abstract
In a method for removing mercury from flue gas produced by combustion devices burning coal and other fuels that contain mercury and chlorine the combustion process is controlled to generate a flue gas comprising fly ash containing at least 0.25% unburned carbon, and preferably at least 5.0% unburned carbon. In addition the flue gas is rapidly cooled from a temperature within the range of 1450.degree. F. to 900.degree. F. to a temperature below 900.degree. F. at a rate of at least 1000.degree. F. per second. This step will enhance the concentrations of Cl-atoms and Cl.sub.2, which accelerates the rates of mercury oxidation in both the gas phase and on particle surfaces. Finally, the flue gas is directed to the particle removal device for removal of the fly ash to which some of the mercury is bound, and also directed to a wet scrubber for retention of the oxidized mercury vapor in wastewater and solid effluents.
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