Method of reducing NOx in a combustion flue gas
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United States of America Patent
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Aug 28, 2001
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N/A
app pub date -
Jul 10, 2000
filing date -
Jul 10, 2000
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Abstract
Methods are provided for decreasing the amount of nitrogen oxides released to the atmosphere as a component of combustion emissions. The methods are carried out by forming a combustion flue gas in a combustion zone, the combustion flue gas including nitrogen oxides, injecting overfire air and droplets of a solution or a powder of a selective reducing agent into a burnout zone, and contacting the combustion flue gas with the overfire air and the selective reducing agent in the burnout zone to thereby decrease the concentration of nitrogen oxides therein. The selective reducing agent is provided in an aqueous solution or powder which is injected into the overfire air in optimized droplet or particle form prior to or concurrently with injection of the overfire air into the burnout zone.
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