双层泡沫陶瓷抑制瓦斯爆炸研究

为有效抑制煤矿瓦斯爆炸产生的冲击波，自行设计、搭建了瓦斯爆炸圆形大尺度管道实验系统，对8%浓度的瓦斯预混爆炸过程中多孔泡沫陶瓷对冲击波的抑制特性进行了研究.研究结果表明：泡沫陶瓷的多孔结构通过弹性形变和塑性形变吸收瓦斯预混爆燃的冲击波能量，实现抑制、衰减冲击波的效果.泡沫陶瓷层数、厚度和位置对抑制瓦斯爆炸传播均有一定的影响，其中层数影响尤为显著，双层布置时爆炸冲击最大超压下降速度更快、梯度更大；设置位置距点火端的距离3 m至4 m的范围内可以成功抑制爆炸的发展和演化；泡沫陶瓷厚度对爆炸冲击波趋势影响并不明显，而对最大超压数值有影响，相比50 mm厚，30 mm厚的泡沫陶瓷最大超压衰减率更大，抑爆效果更好.

The Roles of Double-Layer Foam Ceramics in Suppression of Gas Explosion

In order to effectively suppress the shock waves generated by gas explosion in coal mine, a circular large-scale pipeline experiment system of gas explosion was designed and constructed. The suppression characteristics of porous ceramic foam on shock wave in pre-mixed gas explosion of 8% concentration were studied. The results show that the porous structure of foam ceramic can absorbs the shock wave energy through elastic and plastic deformation for indicating the effects of suppressing and attenuating the shock wave. The number, thickness and location of foam ceramic have certain influences on the suppression of gas explosion propagation. When setting double layer foam ceramic, the maximum overpressure drops faster and the gradient is larger. Thus, the influence of layer number is particularly significant. Foam ceramic installation location from the ignition side to the distance 3 m to 4 m range can successfully suppress the development of the explosion. Foam ceramic thickness has no obvious effect on the explosion shock wave trend but has an impact on the maximum overpressure. Compared with 50 mm thick, 30 mm thick foam ceramic has a stronger inhibiting effect with a hgiher overpressure attenuation rate.