Detection hole control device for low-nitrogen combustion system

The invention relates to the technical field of chemical production equipment, in particular to a detection hole control device for a low-nitrogen combustion system, which comprises a detection hole body formed in the outer side wall of a cracking furnace and an external fixing frame fixed in an opening in the outer side of the detection hole body. According to the detection hole control device for the low-nitrogen combustion system, the frame-shaped inner side refractory bricks are elastically assembled in the detection hole body, and the outer side closing refractory bricks on the inner side face of the lateral closing sealing plate are inserted into the detection hole body to be assembled with the frame-shaped inner side refractory bricks in a closed mode, so that the sealing performance of the interior of the detection hole is guaranteed; lateral overturning adjusting arms used for being connected with the lateral closed sealing plates are movably assembled on the outer sides of lateral assembling bases o