Method for reducing nitrogen oxide emissions
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United States of America Patent
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Aug 4, 2009
Grant Date -
Oct 4, 2007
app pub date -
Jun 2, 2005
filing date -
Jun 3, 2004
priority date (Note) -
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Abstract
The present invention relates to a method for reducing nitrogen oxide emissions in combustion. Fuel is combusted in a first zone, whereby nitrogen oxides are generated. Supplementary fuel is fed in another zone under reducing conditions. At the same time, the temperature is adjusted so that nitrogen oxides convert essentially to hydrogen cyanide. Finally, air is fed in for finalizing the combustion and converting the hydrogen cyanide into nitrogen.
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