Abstract

The existing methods of gas explosion suppression are mainly the use of flameproof water shed or rock powder shed. This passive explosion suppression device often does not adapt to the speed of flame movement due to the time of forming powder mist or water mist due to the action of shed frame, so it cannot play an effective role in actual use. Powder explosion suppression technology has been widely used in the field of combustible gas explosion suppression because of its excellent explosion suppression characteristics, convenient storage and use, nontoxic and pollution-free, low cost. In this paper, the inhibition of gas explosion by nano-SiO₂ powder under the condition of obstacles is studied. It is found that the superfine powder with the main component of SiO₂ has certain effect on explosion-proof and initial explosion inhibition. Among them, the effect of Nano-SiO₂ is the most obvious. The concentration of 100 mg/L nano-SiO₂ powder (the average particle size is 50 nm) in 20 L near spherical vessel can reduce the explosion limit range of methane to 6.95–13.75%, and the maximum overpressure of alkane air body with methane concentration of 7% can be reduced to 0.179 mpa. The research in this paper has an effective significance for the control of gas explosion by powder under the condition of obstacles, and provides suggestions for the improvement of coal mining technology in China.

摘要

现有的瓦斯抑爆方法主要是采用隔爆水棚或岩粉棚。这种被动式抑爆装置往往因棚架的作用形成粉雾或水雾的时间不适应火焰运动的速度，在实际使用中不能发挥有效作用。粉体抑爆技术以其优良的抑爆特性、储存和使用方便、无毒无污染、成本低等优点，在可燃气体抑爆领域得到了广泛的应用。本文研究了纳米SiO ₂粉体在障碍物条件下对瓦斯爆炸的抑制作用。发现以SiO ₂为主要成分的超细粉有一定的防爆和初爆抑制作用。其中，Nano-SiO ₂的效果最为明显。100 mg/L纳米SiO ₂粉末（平均粒径为50 nm）在20 L近球形容器中的浓度可将甲烷的爆炸极限范围降低至6.95-13.75%，烷烃空气体的最大超压与7% 的甲烷浓度可降低至 0.179 mpa。本文的研究对障碍物条件下粉体瓦斯爆炸的控制具有有效的意义，为我国煤炭开采技术的改进提供了建议。