System and method for selective catalytic reduction of...

B - Operations – Transporting – 01 – D

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B01D 53/86 (2006.01)

Patent

CA 2688513

A multi-stage selective catalytic reduction (SCR) unit (32) provides efficient reduction of NOx and other pollutants from about 50-550 oC 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+NH3 reactions above about 200 oC. A downstream portion (36) catalyzes NOx+H2 reactions below about 260 oC, and catalyzes oxidation of NH3, CO, and VOCs with oxygen in the exhaust above about 200 oC, efficiently removing NOx and other pollutants over a range of conditions with low slippage of NH3. An ammonia synthesis unit (28) may be connected to the SCR unit to provide NH3 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.

L'invention concerne une unité de réduction catalytique sélective (SRC) multi-étapes (32) qui permet une réduction efficace des NOx et d'autres polluants autour d'environ 50-550 oC dans une centrale électrique (19). L'unité SRC reçoit une alimentation variable en hydrogène (24) et en ammoniac (29) en fonction de la température. Une portion amont (34) de l'unité SRC catalyse les réactions NOx+NH3 au-dessus d'environ 200 oC. Une portion avale (36) catalyse les réactions NOx+H2 en dessous d'environ 260 oC, et catalyse l'oxydation de NH3, CO, et des COV par l'oxygène dans l'échappement au-dessus d'environ 200 oC, en éliminant efficacement les NOx et d'autres polluants sur une gamme de conditions avec une faible fuite de NH3. Une unité de synthèse d'ammoniac (28) peut être connectée à l'unité SRC pour fournir le NH3 selon les besoins, ce qui évite le transport et le stockage d'ammoniac ou d'urée sur le site. Une installation de gazéification des matières carbonées (18) sur site peut fournir l'hydrogène et l'azote à l'unité de synthèse d'ammoniac, et l'hydrogène à l'unité SRC.

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