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Method for reducing nitrogen oxides in combustion effluents

United States Patent

April 11, 2000
View the Complete Patent at the US Patent & Trademark Office
Method for reducing nitrogen oxides (NO.sub.x) in the gas stream from the combustion of fossil fuels is disclosed. In a narrow gas temperature zone, NO.sub.x is converted to nitrogen by reaction with urea or ammonia with negligible remaining ammonia and other reaction pollutants. Specially designed injectors are used to introduce air atomized water droplets containing dissolved urea or ammonia into the gaseous combustion products in a manner that widely disperses the droplets exclusively in the optimum reaction temperature zone. The injector operates in a manner that forms droplet of a size that results in their vaporization exclusively in this optimum NO.sub.x -urea/ammonia reaction temperature zone. Also disclosed is a design of a system to effectively accomplish this injection.
Zauderer; Bert (Merion Station, PA)
Coal Tech Corporation (Merion Station, PA)
08/ 941,028
September 30, 1997
This invention was made with Government support under contract DE-AC22-91PC91162 awarded by the Department of Energy.