Research On Gas Explosion Experiment And Simulation Of Sealing Fire Zone In High-gas Coal Mine

Gas explosion is one of the most serious mine disasters. There exists high explosiondanger in the process of fire zone sealing in high-gas coal mine, so it is significant to researchthe characteristics of multiple gas explosion and explosion process in sealing area in order toprevent and control gas explosion.This experiment respectively tested the explosion limits of CH₄, CO, C₂H₆and H₂by20L nearly spherical explosion experiment device, compared with the literature values,introduced the concept of explosion risk to analysis explosion danger of each gas. On thisbasis, according to the actual mine gas composition test results, three representative groups ofCO, C₂H₆, H₂concentration ratio was selected, tested the explosion limits of CH₄andcharacteristic parameters of6%-12%CH₄under the condition of each ratio, investigated theinfluence of other flammable gases on explosive characteristic of CH₄. Chose pure CH₄andone ratio, then tested the critical oxygen concentration respectively to provide a certaintheoretical basis for mine flameproof work.The explosion process of multi-component flammable gases under the same condition toexperiments in confined space was simulated with the professional gas explosion simulationsoftware FLACS, through comparing simulation results with experimental ones and analyzingthe errors to validate the feasibility of FLACS in simulating multi-component flammablegases explosion. Revealing the propagation form of explosion wave and pressure distributionof explosion process in small space by means of analyzing the change of pressure field,explosion products concentration field, flammable gases concentration field and velocity fieldin the container at different moments.U-type workface model refers to actual mine was established, using FLACS to simulate the process of gas explosion in it, and systematically investigated the influence of ignitionposition, flammable gases filling length, gas composition, obstacles situation and differentseal situation on explosion process.The datum and thesis conclusions above can provide the theoretical basis forinvestigating gas explosion of fire zone closing in high-gas coal mine.