System and method of protecting a NO x reducing catalyst

Details System and method of protecting a NO x reducing catalyst System and method of protecting a NO x reducing catalyst

2011-03-22

2011-03-22

Vanoy, Timothy C (Department: 1734)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

C423S239100, C423S244070, C423S244080, C423S215500, C422S111000, C422S168000, C422S169000, C422S177000, C422S180000, C431S002000, C431S003000, C431S004000

Reexamination Certificate

active

07910075

ABSTRACT:
A method of protecting a NOx reducing catalyst140from fouling, where the NOx reducing catalyst140is downstream of a circulating fluidized bed (CFB) boiler120and upstream of a particulate removal device150. The method includes introducing a SOxremoving reagent212in a calcium to sulfur molar ratio greater than that required for SO2removal from a flue gas122generated by a CFB120, thereby preventing SO3formation and fouling of the NOx reducing catalyst140.

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