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IN-SITU REGENERATION OF A CATALYST MASKED BY CALCIUM SULFATE
IN-SITU REGENERATION OF A CATALYST MASKED BY CALCIUM SULFATE
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机译:硫酸钙掩蔽的催化剂的原位再生
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摘要
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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