Material adding device

The utility model discloses a material adding device. The material adding device comprises a mounting body, a gun barrel, a gun head and a limiting piece. The mounting body is sleeved with a through hole in the furnace wall of the combustion furnace and provided with a limiting groove extending in the preset direction. Due to the fact that the gun barrel is movably arranged in the limiting groove in a sleeved mode and extends into the combustion furnace, the gun barrel can be pulled in the limiting groove in the preset direction to drive the gun head to move, the gun head is made to move to the nitric oxide distribution position in the combustion furnace, and therefore the spraying range of the gun head can cover nitric oxide to be fully mixed with the nitric oxide; and the denitration agent and the nitrogen oxide are fully mixed and react to generate nitrogen and water, so that the emission of the nitrogen oxide is reduced. The gun head is in threaded connection with the gun barrel, so that the gun head can