Method for catalytically reducing nitrogen oxides

Details Method for catalytically reducing nitrogen oxides Method for catalytically reducing nitrogen oxides

B - Operations, Transporting

01

D

23/353

B01D 53/34 (2006.01) B01D 53/86 (2006.01) B01J 8/12 (2006.01)

Patent

CA 1073637

METHOD FOR CATALYTICALLY REDUCING NITROGEN OXIDES Abstract of the Disclosure A method is disclosed for the removal of nitrogen oxides from heavy oil combustion exhaust gases containing nitrogen oxides, sulfur oxides and dust by a catalytic reduction process using a moving catalyst bed reactor wherein the exhaust gases are catalytically contacted with ammonia at 250 to 450°C. In the moving bed process, a small amount of the catalyst is removed from the reactor through a catalyst outlet and it is then treated for the removal of dust and/or for reactivation, then returned to the catalyst bed through a catalyst inlet in the reactor. A sealing gas having a temperature of 200°C. or higher, preferably 280°C. or higher, and a pressure higher than the average pressure at the outlet and inlet, is introduced into the portions of the reactor where the catalyst is removed and returned, i.e. adjacent the outlet and the inlet. By this method a decrease of the catalyst activity can be effectively prevented, probably because sulfur-contain- ing salts are prevented from adhering to the catalyst bed in the region of the outlet and the inlet by the introduction of the sealing gas.

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