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断电火花
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It was pointed out that the length of gas-air mixture consisted by explosible and non-explosible mixture is formed in coal lane when gas gushed from coal bed. The bigger the air flow of ventilation, the longer the length of gas-air mixture, the higher the gas explosion pressure. The length of gas-air mixture flows away from tunneling end (where the gas was gushed from coal bed) at certain speed. If the length of gas-air mixture is flowing in tunneling lane and a ignition source exists in explosible gas-air mixture....

It was pointed out that the length of gas-air mixture consisted by explosible and non-explosible mixture is formed in coal lane when gas gushed from coal bed. The bigger the air flow of ventilation, the longer the length of gas-air mixture, the higher the gas explosion pressure. The length of gas-air mixture flows away from tunneling end (where the gas was gushed from coal bed) at certain speed. If the length of gas-air mixture is flowing in tunneling lane and a ignition source exists in explosible gas-air mixture. The gas explosion will occur. The paper pointed out that the power turnon and power turnoff controlled by gas sensor and automatic gas circuit breaker according to The regulation for coal mine safety may generate spark (power turnon spark, power turnoff spark and mechanical impact spark), which may ignite the length of explosible gas-air mixture flowing in tunneling lane. This is the pattern of gas explosion in coal mine in recent years. According this pattern, the countermeasures to prevent gas explosion was put forward. The explosion tests performed in experimental lane with natural gas proved that the pattern of gas explosion in coal lane and the corresponding counter-measures are practical and reasonable.

指出了煤矿发生瓦斯突出时形成的混气段是由可爆的和不可爆混气多段组成。风筒风量越大,可爆混气段越长,如果有火源,爆炸产生的压力越大。混气段大致以一定速度远离掘进端面(喷出瓦斯气)流动,未流出掘进巷道则有火源会爆炸。指出了按照《煤矿安全规程》设置的瓦斯传感器、瓦斯自动断电器按规定断电、复电,能够产生断电火花、起动火花、机械撞击火花和工作火花,引爆还处于巷道中的瓦斯—空气可爆混气段,这是近年煤矿瓦斯爆炸的模式,并给出了一种制止煤矿瓦斯爆炸的措施。试验巷道中用天然气进行的爆炸试验证明,这个产生模式以及制止措施是正确的。

 
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