Denitration agent spray gun

The utility model provides a denitration agent spray gun, the system includes: the spray tube, the spray tube pierces through the boiler water wall setting and extends and surpasss the water -coolingwall internal face so that the export of spray tube is located inside the boiler, the spray tube is used for providing denitration agent spray gun with powder denitration agent spout into the passageway of boiler, and capillary, the capillary is followed the spray tube pipe wall sets up extend to on the spray tube length direction the exit end of spray tube for it is right to provide compressed air the export of spray tube is cooled off. According to the utility model discloses a denitration agent spray gun adopts the capillary to sweep compressed air at the exit end of spray tube, can carry out effectual cooling to the export of spray tube, effectively prevent the denitration agent in the adhesion of the export of spray tube, simultaneously, the capillary sets up along the spray tube pipewall, when compressed air