| Gas explosion is one of the most serious mine disasters,its produce the high temperature of flame,strong shock waves and toxic gas seriously threatened the life safety of the underground work personnel,not only such,caused by gas explosion and dust explosion secondary disasters such as collapse will cause the accident severity and scope to further expand.Although the research on gas explosion has always been the focus of the research on mine disasters at home and abroad,it still can’t ensure that the gas explosion accident will not happen.Therefore,the development of a safe and efficient gas explosion inhibitor is of great significance to the safety production of coal mine enterprises.Of the current experimental study for gas explosion,more is to use small pipe explosion experiments,from the spontaneous of gas explosion flow field of laser and light spectrum measurement,the mechanism of gas explosion treatment method,under the condition of half a premixed gas explosion caused and spread phenomenon buss blast ignition and spread of the channel,complex geometry multiple aspects,such as for research.But it is well known that the spread of shock wave and the spread of a chemical reaction is a typical nonlinear phenomenon,is not in conformity with the geometric similarity,so small scale experimental results do not necessarily can reflect the real effect,to examine the reliability of the data and analysis results.However,with the explosion of large pipe or simulated roadway,the data of experimental results fluctuate greatly and it is more difficult to obtain a convincing analysis result.Therefore,this article chooses section is 20 cm * 20 cm of mesoscale experimental pipeline gas explosion experiments,only from the Angle of the explosion pressure and the flame propagation speed is analyzed,which reduces the error of the experimental results,but also has higher reliability,at the same time,the scale of the research on gas explosion effect carries on the preliminary understanding.The research platform of this experiment is composed of shock tube system,charging gas system,vacuum system,measuring system and auxiliary system.In the experimental equipment design and installation process,to prevent false trigger system,photoelectric sensor system and the system transient spectrum do the optimization and upgrading,so as to solve the previous experiments often exist false triggering action,signal acquisition,rock synchronous control and transient spectrum.In this paper,the interaction between methane air mixed gas and water layer is studied,and quantitative analysis is carried out from the aspects of pressure and flame,and the influence of thin layer on gas explosion is explored.The main contents and conclusions of the experiment are as follows:(1)designed a set of experimental platform which can carry out the explosion of methane air mixed gas and the fine water mist suppression experiment and can collect and process the pressure data and flame information in the experiment.(2)in the experiment,it was found that the explosion in the high pressure area was irregular,and there was an oscillating superposition effect in the process of pressure rise.(3)the flame propagates at the maximum velocity of 0.425 from the bottom of the tube;The rate of flame propagation,explosion pressure and resultant increase rate is directly proportional to the approximate degree of methane concentration and chemical metering ratio.(4)the flame propagation speed,explosion pressure and pressure rise rate are inversely proportional to the flow rate of the anti-explosion spray,and when the spray volume is relatively small,it can promote the propagation and pressure of the explosive flame. |
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