Method of cleaning and/or regenerating wholly or partially de-activated catalysts of stack-gas nitrogen scrubbing

A cleaning kit for a fossil fuel burning facility in which a flue gas flow path is defined, said cleaning kit serving to remove process impurities carried on a surface of a wholly or partially deactivated Nox reduction catalyst which is installed in the flue gas flow path exiting from the fossil fuel burning facility to at least partially reactivate such catalyst, the cleaning kit, comprising:

• a movable cleaning reagent supply grid adapted to be selectively positioned above a portion of a catalyst layer;
• a source of supply of liquid cleaning reagent adapted to be in communication with said supply grid, from which a portion of the liquid cleaning reagent is directed through said supply grid in a manner that essentially all of said portion of said catalyst lever has liquid cleaning reagent passing therethrough, said liquid cleaning reagent being in contact with said portion of said catalyst layer for the removal of at least a portion of such process impurities therefrom;
• a cleaning reagent collection basin adapted to be selectively positioned below such portion of said catalyst layer to catch cleaning reagent therein after such reagent passes through such portion of said catalyst layer;
• and
• recirculating means for recirculating at least a portion of such cleaning reagent received from said collecting basin and delivering same to said supply grid, said recirculating means including at least one of:
• a separating device for removing at least a portion of accumulated solids from said at least a portion of such cleaning reagent prior to recirculation through said supply grid, and adding portion means operative to supply additives to the liquid cleaning reagent.