In-situ regeneration of a catalyst masked by calcium sulfate

Details In-situ regeneration of a catalyst masked by calcium sulfate In-situ regeneration of a catalyst masked by calcium sulfate

B - Operations, Transporting

01

D

B01D 53/96 (2006.01) B01J 38/04 (2006.01) B01J 38/60 (2006.01)

Patent

CA 2659803

An in-situ method for regenerating a deactivated catalyst removes a calcium sulfate layer masking active catalyst sites. A reducing agent converts the calcium sulfate to calcium oxide, which is then removed, by reintrainment into the flue gas steam using soot blowers or sonic horns. The method is particularly useful for regenerating selective catalytic reduction (SCR) catalysts used to remove nitrogen oxides from flue gas produced by combustion of coal from the Powder River Basin. The method can be practiced using existing SCR system hardware, and without removing the SCR system from service.

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