可燃气体爆炸威力大、破坏性强，过程难以控制，对煤矿安全开采以及工业安全生产造成了极大的威胁。因此，可燃气体爆炸灾害事故的防治工作一直被安全工作者所重视，对寻找与探索高效环保的新材料抑爆剂的工作从未停止。

本文应用20L球形爆炸装置，选取哈龙灭火剂的替代物之一三氟碘甲烷与惰性气体二氧化碳来抑制甲烷-空气爆炸。研究了甲烷浓度为7.8%、9.5%和11.3%的条件下，分别加入单组份抑爆剂与复合抑爆剂对甲烷爆炸抑制作用，对比分析了不同浓度抑爆剂对甲烷浓度为9.5%与甲烷-空气当量比为1两种情况下爆炸压力参数的影响，以及在特定条件下三氟碘甲烷对甲烷-空气爆炸初期火焰结构的影响，并结合实验结果分析了甲烷-空气爆炸抑制机理。

实验结果表明：纯甲烷-空气的爆炸极限为5.05%~16.35%，加入二氧化碳时甲烷爆炸的最大安全氧浓度是12.45%，加入三氟碘甲烷时甲烷爆炸的最大安全氧浓度是17.57%，对比发现三氟碘甲烷对甲烷的抑爆效果比二氧化碳好。相比单独使用单组份抑爆剂，复合使用三氟碘甲烷-二氧化碳可以同时发挥两种不同抑爆剂各自的优势，能显著降低最大爆炸压力、压力上升速率，且压力峰值时刻和压力上升速率峰值时刻被明显延迟，抑爆效果更好。加入不同浓度的复合抑爆剂时，与控制甲烷浓度为9.5%相比，控制甲烷-空气当量比为1时，最大爆炸压力与最大爆炸压力上升速率更小，且对其抑制效果更好。

当甲烷-空气发生爆炸时，火焰在容器内快速传播，并产生胞状化结构，且随着时间的推移胞状结构逐渐变小，火焰亮度逐渐变亮；当加入甲烷点火后不发生爆炸时，甲烷-空气爆炸初期的火焰上下对称扩散，随后上半部分逐渐增大，下半部分逐渐缩小，最后完全脱离点火源，呈“蘑菇”形，加入一定量的三氟碘甲烷后与纯甲烷不发生爆炸时的火焰形态相似，但火焰较纯甲烷明亮，这表明由于甲烷浓度较小或甲烷爆炸被抑制住时，虽然没有发生爆炸，但爆炸初期仍有火焰产生，而加入的三氟碘甲烷能抑制住甲烷爆炸火焰的传播。

The explosion of combustible gas is powerful and destructive, and the process is difficult to control, which poses a great threat to the safety of coal mining and industrial production. Therefore, the prevention and treatment of combustible gas explosion accidents has always been valued by safety workers, and the work of searching for and exploring new materials with high efficiency and environmental protection has never stopped.

In this paper, a 20L spherical explosive device is used, and as one of the substitutes of halon fire extinguishing agent- trifluoroiodomethane and inert gas carbon dioxide are selected to suppress methane-air explosion. Under the conditions of methane concentration of 7.8%, 9.5% and 11.3%, the effects of adding a single-component explosion suppressor and a composite explosion suppressor on methane explosion suppression were studied respectively. The explosion pressure parameters were be compared and analyzed in two case of 9.5% methane concentration and methane-air equivalent ratio of 1 in different concentrations of explosion suppressor on. The effect of trifluoroiodomethane to the initial flame structure of methane-air explosion under certain conditions, and combined with the experimental results to analyze the methane-air explosion inhibition mechanism.

The experimental results show that the explosion limit of pure methane-air is 5.05%~16.35%. When carbon dioxide is added, the critical oxygen concentration of methane explosion is 12.45%, and when trifluoroiodomethane is added, the critical oxygen concentration of methane explosion is 17.57%. Compared with using a single-component explosion suppressor, the combined use of trifluoroiodomethane-carbon dioxide can simultaneously exert the respective advantages of two different explosion suppressor, and can significantly reduce the maximum explosion pressure, and the pressure peak moment is obviously delayed, and the explosion suppression effect is better. When adding different concentrations of composite explosion suppressor, compared with the control methane concentration of 9.5%, when control the methane-air equivalent ratio is 1, the maximum explosion pressure and the maximum explosion pressure rise rate are smaller, and the suppression effect is better.

When methane-air explodes, the flame spreads rapidly in the container and produces a cellular structure.When the cellular structure gradually becomes smaller over time, the flame brightness gradually becomes brighter. When there is no explosion after adding methane to ignite, the flame spreads symmetrically up and down at the initial stage of the methane-air explosion. And then the upper part gradually increases, and the lower part gradually shrinks. Finally, it completely separates from the ignition source and assumes a "mushroom" shape. The flame shape of a certain amount of trifluoroiodomethane is similar to pure methane when it does not explode, but the flame is brighter than pure methane. This indicates that because the methane concentration is small or the methane explosion is suppressed, although there is no explosion, the initial explosion flames are still produced, and the added trifluoroiodomethane can inhibit the spread of methane explosion flames.

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