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System and method for selective catalytic reduction of nitrogen oxides in combustion exhaust gases

United States Patent

April 8, 2014
View the Complete Patent at the US Patent & Trademark Office
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A multi-stage selective catalytic reduction (SCR) unit (32) provides efficient reduction of NOx and other pollutants from about C. in a power plant (19). Hydrogen (24) and ammonia (29) are variably supplied to the SCR unit depending on temperature. An upstream portion (34) of the SCR unit catalyzes NOx+NH.sub.3 reactions above about C. A downstream portion (36) catalyzes NOx+H.sub.2 reactions below about C., and catalyzes oxidation of NH.sub.3, CO, and VOCs with oxygen in the exhaust above about C., efficiently removing NOx and other pollutants over a range of conditions with low slippage of NH.sub.3. An ammonia synthesis unit (28) may be connected to the SCR unit to provide NH.sub.3 as needed, avoiding transport and storage of ammonia or urea at the site. A carbonaceous gasification plant (18) on site may supply hydrogen and nitrogen to the ammonia synthesis unit, and hydrogen to the SCR unit.
Sobolevskiy; Anatoly (Orlando, FL), Rossin; Joseph A. (Columbus, OH)
Siemens Energy, Inc. (Orlando, FL)
12/ 122,093
May 16, 2008
STATEMENT REGARDING FEDERALLY SPONSORED DEVELOPMENT Development for this invention was supported in part by Contract No. DE-FC26-05NT42644, awarded by the United States Department of Energy. Accordingly, the United States Government may have certain rights in this invention.