Patent ID: 7470412

Claim:
A method for treating a regenerator flue gas stream comprising (A) providing from a catalyst regenerator a regenerator flue gas stream that contains NOx and carbon monoxide; (B) mixing fuel and oxygen and combusting a portion of the oxygen in the mixture with said fuel to form a hot oxidant stream that has a temperature of at least 2000 F and that contains oxygen and products of said combustion; (C) feeding the hot oxidant stream at a velocity of at least 500 feet per second into the regenerator flue gas stream to form a mixture having a temperature higher than 1250 F sufficient to convert carbon monoxide in the mixture to carbon dioxide and to convert NOx in the mixture to N 2 thereby producing a product stream wherein the amount of NOx in the product stream following said conversion is less than the amount of NOx in said regenerator flue gas stream before said mixture is formed.