Denitration spray gun

The invention relates to a denitration spray gun, which belongs to the technical field of boiler flue gas denitration in the waste incineration industry and comprises an outer sleeve with a nozzle at the front end and an inner sleeve with the front end extending to the middle of the outer sleeve from the rear end of the outer sleeve, and the outer diameter of the inner sleeve is smaller than the inner diameter of the outer sleeve so as to form a fluid channel with the outer sleeve. The inner sleeve is fixedly connected with the outer sleeve through a locking device arranged at the rear end of the outer sleeve, an air inlet connector communicated with the fluid channel is arranged on the outer sleeve, and a liquid inlet connector is arranged at the rear end of the inner sleeve. The front end face of the spray head is a spherical surface and is provided with a plurality of spray holes. The gas-liquid mixing chamber defined by the inner sleeve, the outer sleeve and the spray head is located in the middle of the