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

Abstract

The invention concerns a method of cleaning and/or regenerating wholly or partially de-activated catalysts for stack-gas nitrogen scrubbing, in which the catalysts are treated with a washing and/or regenerating liquid, characterized by the washing or regenerating liquid consisting wholly or in part of demineralized water.

1 . A method for scrubbing and/or regenerating of wholly or partially deactivated catalytic devices for nitrogen removal from stack gases, wherein the catalytic devices are treated with a scrubbing, or respectively regenerating fluid, characterized in that the scrubbing, or respectively regenerating fluid is partially or wholly desalinated water.  
     
     
         2 . The method in accordance with  claim 1 , characterized in that the scrubbing, or respectively regenerating fluid is moved in circulation, wherein a partial flow is removed downstream of the catalytic device and replaced by fresh scrubbing, or respectively regenerating fluid.  
     
     
         3 . The method in accordance with one of the preceding claims, characterized in that a scrubbing, or respectively regenerating fluid with a pH value of ≦7 is used.  
     
     
         4 . The method in accordance with one of the preceding claims, characterized in that the surface of the catalytic device is additionally treated with an abrasive.  
     
     
         5 . The method in accordance with one of the preceding claims, characterized in that at least one catalytically active component is added to the scrubbing, or respectively regenerating fluid.  
     
     
         6 . The method in accordance with one of the preceding claims, characterized in that prior to treatment coarse dust deposits are removed manually or by means of suitable cleaning devices, for example steam blowers.  
     
     
         7 . The method in accordance with one of the preceding claims, characterized in that following treatment the catalytic devices are cleaned by air or stack gas.  
     
     
         8 . The method in accordance with  claim 7 , characterized in that drying of the catalytic devices is performed immediately following the treatment of a partial section.  
     
     
         9 . The method in accordance with one of claims  7  or  8 , characterized in that the treatment and drying of the catalytic devices is performed by means of a unit.  
     
     
         10 . The method in accordance with one of the preceding claims, characterized in that existing steam or air blowing devices used for removing flying dust are employed for introducing the scrubbing, or respectively regenerating fluid.  
     
     
         11 . The method in accordance with one of the preceding claims, characterized in that the catalytic devices are subjected to a bath in the scrubbing, or respectively regenerating fluid.  
     
     
         12 . The method in accordance with  claim 11 , characterized in that the honeycombs of the catalytic device or respectively the nitrogen removal reactor are closed at their bottom, and the catalytic devices are filled with the scrubbing, or respectively regenerating fluid.  
     
     
         13 . The method in accordance with one of the preceding claims, characterized in that tap water is used as the scrubbing, or respectively regenerating fluid.