A test method for simulating repeated gas explosions in coal mine corner roadway networks

Abstract

An experimental method for gas repeated explosion at simulated coal mine diagonal roadway mesh is applicable to repeated explosion study for combustible gas. A front methane-air premixing bag and a rear methane-air premixing bag are disposed in the simulated coal mine diagonal roadway mesh, combustible gas in the front methane-air premixing bag is ignited by a high-tension discharge igniter, gas explosion impact wave breaks the rear methane-air premixing bag in propagating process, gas repeated explosion occurs when a flame face behind the impact wave ignites combustible gas in the rear methane-air premixing bag, a high-frequency flame sensor and a high-frequency pressure sensor transmit a gas explosion flame signal and a pressure signal respectively to a flame data collector and a pressure data collector, and the signals are stored in a data processing unit. The method has the advantages of good operational simplicity, flexibility, diverse comprehensive functionality and the like, the process where gas initial explosion leads to secondary explosion can be visualized, and it is also possible to study how air flow varies in the coal mine diagonal roadway mesh.

Description

technical field [0001] The invention relates to the technical field of explosion tests of combustible gases, in particular to a test method for simulating repeated explosions of gas in coal mine corner alleyways. Background technique [0002] According to statistics, since the founding of New China, there have been 24 particularly serious accidents in coal mines across the country that killed more than 100 people and killed 3,780 people. Among them, there were 21 explosions (including gas explosions, gas and coal dust explosions, and coal dust explosions) accidents, killing 3,424 people. Deaths, accidents and fatalities accounted for 87.5% and 90.58% respectively. After a gas explosion occurs in a coal mine, when the shock wave and the flame surface propagate forward along the underground roadway, the precursor shock wave can flush out the gas accumulated in the goaf or other places. If the new gas concentration reaches the explosion limit, when it lags behind the shock wave...

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Problems solved by technology

[0004] Technical problem: Aiming at the current lack of experimental research on the simulated gas repeated explosion in the corner lane network of coal mines at home and abroad, and the fact that the formation mechanism and influencing factors of the gas repeated explosion are not very clear, the present invention provides a simple, flexible, The test method for simulating repeated explosions of gas in the corner network of coal mines with multiple comprehensive functions can be used to study the overpressure development law of repeated gas explosions in the simulated coal mine corner network, the law of flame propagation of repeated gas explosions, and the gas caused by repeated explosions Changes of wind current

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