Method and apparatus for adding reducing agent to secondary overfire air stream
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United States of America Patent
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Jan 24, 2006
Grant Date -
Mar 10, 2005
app pub date -
Sep 8, 2004
filing date -
Sep 9, 2003
priority date (Note) -
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Abstract
A combustion boiler for burning fuel and producing heat to generate steam. A method of minimizing discharging of nitrogen oxides from a combustion boiler comprising the steps of spraying a reducing agent into an overfire air stream and supplying the overfire air stream to the combustion boiler. Vaporizing the sprayed reducing agent at least within about 0.1 seconds of the sprayed reducing agent entering the combustion boiler and reacting the vaporized reducing agent with the nitrogen oxides within the combustion chamber to reduce the nitrogen oxides and minimize discharge of nitrogen oxides from the combustion boiler. The reducing agent is nearly substantially instantaneous evaporated/gasified by the high energy of the reducing agent injection system.
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