Pre-buried double-pipe stepping type goaf nitrogen injection method

Abstract

The invention discloses a pre-buried double-pipe stepping type goaf nitrogen injection method which comprises the following steps: firstly, determining the length of an oxidation heating zone of a goaf, enabling the oxidation heating zone to move forwards along with the recovery of a fully mechanized coal mining face, and laying two nitrogen injection pipes in front of and behind a whole recovery air inlet roadway, namely a first nitrogen injection pipe and a second nitrogen injection pipe. The two nitrogen injection pipes are respectively connected with a nitrogen injection source through valves outside a mining stopping line of a working face, and the two nitrogen injection pipes move forwards to oxidize a heating zone to perform double-pipe stepping type nitrogen injection along with pushing mining of the working face, so that the spontaneous combustion phenomenon of residual coal in a goaf can be avoided, the fire extinguishing effect is achieved, and the purpose of preventing and extinguishing fire is achieved. Smooth operation of a coal face is guaranteed, the safety coefficient of coal mining operation is improved, two pipelines are directly buried at a time, stepping alternating type nitrogen injection is carried out, and the problems that a conventional nitrogen injection pipeline is difficult to install and recycle, prone to breakage and short in working time are solved.

Description

technical field [0001] The invention relates to a coal mine mining safety system, in particular to a method for injecting nitrogen into a goaf with a pre-buried double-pipe walking type. Background technique [0002] In the process of coal seam recovery, since the coal seam contains carbon monoxide, there will be an oxidation temperature rise zone in the goaf following the coal seam excavation section along the mining direction. If the oxidation temperature rise zone is not cooled, spontaneous combustion will easily occur and cause accidents. At present The measures taken are to inject nitrogen to lower the temperature. Since the oxidation temperature rise zone always exists with the excavation and excavation, the current method is to follow up with the laying of pipelines again and again with the mining of the working face. First, nitrogen injection pipes appear Road installation and recycling are difficult, and the second is that the nitrogen injection pipeline is easily b...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a method of pre-embedded double-pipe walking-type gob nitrogen injection; directly bury two pipelines at one time, do not need to lay pipelines frequently, and carry out alternating nitrogen injection in steps, which solves the problem of conventional nitrogen injection pipelines Difficulty in installation and recycling, easy to break and working hours

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