Method for reducing NOx emission in incomplete regeneration flue gas in catalytic cracking process

The invention belongs to the field of catalytic cracking, and discloses a method for reducing NOx emission in incomplete regeneration flue gas in a catalytic cracking process. According to the method,CO-containing flue gas discharged from a catalytic cracking regenerator is introduced into a denitration auxiliary agent tank; a denitration auxiliary agent is subjected to activation pretreatment; and the denitration auxiliary agent subjected to activation pretreatment is quantitatively pressed into the catalytic cracking regenerator through the pressure difference between the auxiliary agent tank and the regenerator and the opening and closing of an electromagnetic valve, and is used for catalytically converting reduction-state nitrides such as NH3 and the like in the flue gas in a catalystregeneration process. According to the invention, CO-containing high-temperature catalyst charring flue gas in the regenerator of a catalytic cracking device is introduced into an independent denitration auxiliary agent tank