Low-nitrogen burner convenient to disassemble and assemble

The utility model relates to the technical field of clean combustion, and discloses a low-nitrogen combustor convenient to disassemble and assemble, which solves the problems that a combustion tube of an existing low-nitrogen combustor is generally of a fixed structure and is inconvenient to maintain and replace, and the working efficiency is easy to reduce, and comprises a bottom plate, and the upper end of the bottom plate is connected with a combustor body. The rotary shaft drives the gear to rotate, the gear is meshed with the rack plate, then the rack plate drives the pull rope to move upwards, the pull rope moves upwards to drive the fixing block to move towards the interior of the containing groove, and the fixing block is fixed through the clamping assembly. Therefore, the combustion pipe can be maintained and replaced by the device, and the use efficiency is improved; the lower end of the combustion pipe is located in the supporting groove, the combustion pipe is fixed under the elastic potential ene