蒙脱石粉体对瓦斯爆炸特性参数的影响研究

Investigation of the Effect of Montmorillonite Powders on Gas Explosion Parameters

选用天然矿物粉体蒙脱石作为抑爆材料,通过20 L球形爆炸装置和自主设计的5 L管道实验系统,测试了蒙脱石粉体及其浓度对甲烷-空气预混气体的爆炸压力、火焰传播速度等特性参数的影响.结果表明:蒙脱石粉体对甲烷爆炸具有一定的抑制作用,甲烷-空气预混气体的最大爆炸压力和爆炸火焰传播的平均速度随着粉体浓度的增加呈现先降低后上升的趋势.其中,当粉体浓度为0.16 g/L时,爆炸压力下降至最低,比未添加粉体时下降了29.2%;当粉体浓度为0.20 g/L时,火焰传播平均速度最小.此外,结合蒙脱石粉体的元素组成及热解特性分析其瓦斯抑爆机理.

With natural mineral montmorillonite powder as gas explosion inhibitor, the effect of the concentration of montmorillonite powder on the characteristic parameters of explosion pressure and the average velocity of flame propagation at 9.5% methane-air premixed gas were tested using the 20 L spherical explosion device and the 5 L pipeline experimental system. The results showed that montmorillonite powder displayed a good suppression effect on methane explosion, the max-pressure of methane explosion and the average velocity of flame propagation of 9.5% methane-air premixed gas decreased firstly and then increased with the increased concentration of montmorillonite powder. The max-pressure of methane explosion, decreasing by 29.2%, was the lowest when the mass concentration of montmorillonite powder was 0.16 g/L in the 20 L spherical explosive device;in the pipeline explosion suppression test system, when the mass concentration of montmorillonite powder was 0.20 g/L, the flame propagation velocity was the lowest. In addition, the mechanism of the inhibition methane explosion by montmorillonite powder was also discussed.