Multi-compartment overfire air and N-agent injection method for nitrogen oxide reduction in flue gas
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United States of America Patent
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Nov 8, 2011
Grant Date -
Jun 16, 2011
app pub date -
Feb 18, 2011
filing date -
Jun 5, 2003
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Abstract
A method of decreasing a concentration of nitrogen oxides in a combustion gas flowing through a vessel including: generating a flue gas in a combustion zone of the vessel, the flue gas containing nitrogen oxides and carbon monoxide; providing overfire air into a burnout zone of the vessel from a first injector of overfire air to oxidize at least some of the carbon monoxide in the flue gas; injecting a selective reducing agent concurrent with overfire air at a level in the burnout zone downstream of the first injector of overfire air and downstream of the oxidization of the carbon monoxide, and reacting the selective reducing agent with the flue gas to reduce the nitrogen oxides.
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