1、前言由于煤炭开采向深部发展和高度集中以及开采强度的提高,工作面的瓦斯涌出量增大,在工作面上使用气体引射器(以下简称引射器)或者局扇排除瓦斯的煤矿增多了,而且希望这些设备向大型化发展。但是,在这些工作地点有相当的浮游煤尘存在,因此就会出现混入这些机器的煤尘高速飞扬现象。而混入的煤尘在高速飞扬中就带上了电,或者由于和井下器材的冲击而产生很大的静电并互相进行交换。而且,这种积聚的静电发生的放电火花就有可能引燃 1. Foreword Due to the deep development and high concentration of coal mining and the increase of mining intensity, gas emission from working face increases. Gas ejectors (hereinafter referred to as ejectors) or gas exhausting Increased coal mines, but also hope that these devices to large-scale development. However, considerable amounts of floating coal dust exist at these duty stations, so that high-speed flying of coal dust mixed with these machines may occur. The mixed coal dust is charged with electricity at high flying speeds, or generates large static electricity and exchanges with each other due to the impact with the downhole equipment. Moreover, this accumulation of electrostatic spark discharge may be ignited