Method for catalytically reducing nitrogen oxides

Abstract From the Canadian patent

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 …