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

Sobolevskiy, Anatoly; Rossin, Joseph A

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

Patent · Tue Apr 08 00:00:00 EDT 2014

OSTI ID:1129175

Sobolevskiy, Anatoly; Rossin, Joseph A

A multi-stage selective catalytic reduction (SCR) unit (32) provides efficient reduction of NOx and other pollutants from about 50-550.degree. 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 200.degree. C. A downstream portion (36) catalyzes NOx+H.sub.2 reactions below about 260.degree. C., and catalyzes oxidation of NH.sub.3, CO, and VOCs with oxygen in the exhaust above about 200.degree. 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.

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Research Organization:: Siemens Energy, Inc., Orlando, FL (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: FC26-05NT42644

Assignee:: Siemens Energy, Inc. (Orlando, FL)

Patent Number(s):: 8,691,170

Application Number:: 12/122,093

OSTI ID:: 1129175

Resource Relation:: Patent File Date: 2008 May 16

Country of Publication:: United States

Language:: English

References (32)

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