Desulfurization and denitration spray gun with long service life

The utility model relates to the field of desulfurization and denitrification, in particular to a long-service-life spray gun for desulfurization and denitrification, which comprises a conveying inner pipe, a cooling sleeve is fixedly sleeved on the conveying inner pipe, a connecting bolt ring is fixedly sleeved on the cooling sleeve, a sealing ring is movably sleeved on the cooling sleeve, and a mixing conveying pipe is movably sleeved on the sealing ring. According to the long-service-life spray gun for desulfurization and denitrification, through the arrangement of the sealing ring, the cooling sleeve and the mixed conveying pipe are connected in a sealed mode, finally, insertion and positioning are further conducted through the insertion bolt, parts of the spray gun are convenient to mount and dismount, meanwhile, the parts are convenient to clean, the structure is simple, practicability is high, and popularization is easy. A cooling cavity is formed in the gap through the cooling sleeve fixedly connected