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泡沫陶瓷隔爆棚抑制瓦斯爆炸的机理及数值模拟研究
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摘要
当前煤矿井下采用的瓦斯爆炸阻隔爆装置,如隔爆水棚,对爆炸冲击波的抑制作用较弱;而且,这些技术仅针对一次性瓦斯爆炸,但不能有效抑制瓦斯多次及连续爆炸。针对上述缺陷,本文提出了泡沫陶瓷隔爆棚的新设想。通过流体饱和多孔介质的波传递方法,数值模拟研究了瓦斯爆炸冲击波在模拟掘进巷道中设置不同片数泡沫陶瓷隔爆棚时的传播状况。模拟结果表明瓦斯爆炸冲击波的超压可以在泡沫陶瓷隔爆棚区衰减为对人员和井下设施的安全范围,不能继续向前在巷道中传播。并从化学反应动力学、爆炸力学、材料力学、冲击波传播理论等角度分析了泡沫陶瓷隔爆棚对瓦斯爆炸火焰波和冲击波的双重抑制机理。进而,探讨了泡沫陶瓷隔爆棚在煤矿井下不同部位的安装设置。研究成果为开发泡沫陶瓷隔爆棚抑制井下瓦斯多次及连续爆炸的新技术提供了理论依据,有深远的实践应用意义。
All the present gas explosion suppression techniques used in coal mine, such as water barrier, are weak in suppressing shock wave. Moreover, these techniques play a part only for primary gas explosion, while fail to suppress multiple and continuous explosions. With regards to these defects, this dissertation puts forward foam ceramics explosion barrier. Using the wave transmission method of fluid saturated porous medium, propagation of shock wave is numerically simulated when foam ceramics are placed in the heading roadway. The simulation results indicate that, maximum overpressure of gas explosion shock wave can be attenuated to the range safe to personnel and mine facilities in the explosion barrier, thus protecting the personnel and mine facilities to the maximum extent. Then, the mechanism of ceramics barrier doubly suppressing combustion and shock wave is analyzed from the perspective of chemical reaction dynamics, explosion mechanics, material mechanics and shock wave propagation theory. Furthermore, the placement of foam ceramics barrier in different locations of coal mine is explored. The research results lay theoretical grounds for development of foam ceramics barrier suppressing multiple and continuous gas explosions and are of profound application significance.
引文
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