The Effect of Nitrogen Spray Pressure on the Inhibition of Gas Explosion by Porous Foam Copper
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摘要:为探究氮气喷射压力对多孔材料抑制煤矿瓦斯抽放管道瓦斯爆炸特性的影响，基于自建的实验平台，开展了20 PPI泡沫铜、安装位置距点火端70 cm时，不同氮气喷射压力对瓦斯燃爆特性的影响研究。研究结果表明：喷射的氮气诱导火焰锋面形成了“多层焰锋”；火焰到达泡沫铜表面和泄爆口的时间以及二次点燃的时间均随着喷射压力的增大而提前；0.15 MPa的氮气喷射压力对爆炸火焰的传播及下游的超压峰值表现出抑制作用，火焰速度峰值较0 MPa时降低了25.15%，超压峰值较0 MPa时降低了11.38%，且氮气喷射压力与最大爆炸压力出现位置及其形成过程密切相关。本研究结果可为瓦斯抽放管线的安全设施布置提供理论支撑，对安全灾害工作的防治具有重要意义。
Abstract:To explore the effect of different nitrogen spray pressure on the suppression of gas explosion characteristics by porous materials in gas drainage pipeline of coal mine, based on a self built experimental platform, the study on the effect of different nitrogen spray pressure on the combustion and explosion characteristics of gas was carried out, when the distance between 20 PPI porous foam copper and the ignition end was 70 cm . The results show that: due to the sprayed nitrogen, the "multi-layer flame front" on the flame front is formed, the time for secondary ignition, and the flame arrival at the porous foam copper surface, as well as explosion vent all advance with the increase of nitrogen spray pressure; When the nitrogen spray pressure is 0.15 MPa, the suppression effect of nitrogen spray pressure on the propagation of explosion flame and the downstream overpressure peak is demonstrated, the velocity peak of flame is reduced by 25.15%, and the overpressure peak is reduced by 11.38% compared to those under 0 MPa. Meanwhile, the nitrogen spray pressure is closely related to the location and formation process of the maximum explosion pressure. The results of this study can provide theoretical support for the layout of safety facilities in gas drainage pipelines, and have the great significance for the prevention and control of safety disasters.
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