纳米粉体对矿井瓦斯的抑爆作用

Inhibitory effect study on nanometer powder to gas explosion in coalmine

通过对传统抑爆剂抑制瓦斯爆炸的作用分析,自主改进形成了瓦斯抑爆实验系统,采用最大爆炸压力、压力上升平均速率等指标表征纳米粉体的抑爆性能.实验结果表明,同微米级粉体相比,纳米粉体的抑爆效果更好,甲烷最大爆炸压力、压力上升平均速率分别下降了70.5%和90%以上,爆炸压力峰值时间延长了3倍多.并在纳米粉体表面效应等基本理论的基础上,结合粉体热重分析,从物理、化学抑制自由基作用及纳米粉体特殊的阻燃抑爆作用分析探讨了纳米粉体对矿井瓦斯的抑爆机理,提出了纳米抑爆粉体的性能表征参数.

The effect of explosion suppression with traditional suppressant was analyzied. Based on these, the experimental system of explosion suppressant was established by the autonomous improvement, and the efficiency of restraining explosion was denoted by the indexs including maximum explosion pressure and average rate of pressure rise. The results showed that the efficiency of restraining methane explosion with nanoparticles is better than micro-sized powder. And maximum explosion pressure and average rate of pressure rise reduces 70.5% and over 90%, respectively. The peak time of explosion pressure relongs more than three times. In addition, The inhibitory effect of nanometer powder was studied by physics suppression, chemistry suppression and special flame retardation on free radical, based on the basic theory of nano-powder surface effects and the thermogravimetrie analysis of powder. And the characterization parameters of nano-powder to control explosion suppression were poined out. 5figs., 2tabs., 12refs.