摘要
从产生瓦斯爆炸的基本条件分析指出,煤矿加大加强风筒风量的目的是将正常情况的绝对瓦斯涌出量稀释为瓦斯体积分数小于1%的混气,某些高瓦斯矿井的风量要求高达400m3/min,这是优点。分析还指出,在绝对瓦斯涌出量为5m3/min^75m3/min或更大的轻度瓦斯突出的异常情况下,风筒送入的风与突出的瓦斯混合成大量的瓦斯体积分数处于爆炸上限与下限之间的可爆混气。风量越大,形成的可爆混气体积越大。例如,400m3/min的风量2min内可形成≥842m3的可爆混气,遇火源可发生爆轰,造成整个矿井内大部分人员死亡。因此,加大加强的风量对防止煤矿瓦斯爆炸起负(反)作用。目前,采取的各种措施不能有效地消除加大加强风量引起的负(反)作用。已有两种试验证明有效的消除负作用的措施。
From analyzing the basic factor of gas produced, the paper showed that the purpose of stronger and bigger fan drum air output is to dilute the quantity of the absolute gas emerged at normal conditions into the air mixture with the concentration less than 1 %. The wind quantity of some high gas produced mine is acquired up to 400 m^3/min. This is the advantage. The paper also showed at the unusual conditions, such as 5m^3/min-75m^3/min output of gas or more, the wind from the fan drum mixture with the gas form the concentration of gas between the explosion high extreme and low extreme. The heavier is the wind, the bigger is the explosive mixture volume, for example, the wind rate of 400 m^3/min can form explosive air mixture of more than 842 m in less than 2 min. When met with fire resource, it can cause most people to kill in the mine. Bigger and stronger ventilation has a negative effect on gas explosion, and the current measures could not eliminate the negative effect of the stronger wind effectively. It has been two experiments that proved to eliminate that negative effect.
出处
《消防科学与技术》
CAS
2006年第2期167-171,共5页
Fire Science and Technology
关键词
煤矿
瓦斯爆炸
瓦斯突出
加大通风
mine
gas explosion
gas emerged
stronger ventilation
