Analysis on Destruction Characteristics of Gas Explosion in Coal Mines

摘要

Based on the mechanism and propagation characteristics of gas explosion,the influencing factors of gas explosion propagation in coal mines were analyzed,which include methane concentration,methane pressure,initial temperature,inert gas,ignition source,oxygen concentration,explosion space characteristics,and external environment conditions.Different factors play different roles in different periods and different states.Gas explosion in coal mines can cause great destruction;the injury effect on personnel is mainly manifested in three aspects:the killing effect of shock wave overpressure (impulse) on personnel;the injury caused by dynamic pressure;the personnel asphyxiation effect caused by toxic and harmful gases.The three kinds of personnel injury effect act individually or simultaneously.The shock wave destruction can be measured by three characteristic parameters:peak overpressure,impulse and duration time.The shock wave destruction criteria includes the overpressure criterion,the impulse criterion and overpressure-impulse criterion;and the overpressure criterion is most commonly used.Finally,the reflection tension destruction mechanism of shock wave and the destruction mechanism of the high-temperature high-pressure gas were summarized;the destruction process of gas explosion in coal mines was obtained.