瓦斯爆炸事故是我国煤矿主要灾害之一，严重威胁着职工和企业的生命安全。由于井下环境的复杂性，在一定程度上增大了灾害的破坏程度和范围。 矿井中存在的除甲烷以外的其它可燃性气体在瓦斯爆炸的过程中都参与了爆炸，并且，对瓦斯爆炸的影响也非常巨大。而这些可燃性气体对甲烷的爆炸特性有多方面的影响。本文在理论分析及大量实验的基础上，探讨研究了一氧化碳、乙烷和氢气存在的条件下，甲烷的爆炸极限、爆炸压力、临界氧浓度和最小氧浓度的变化规律；通过向甲烷和甲烷混合气体中添加惰性介质用以改变可燃混合气体的爆炸极限的办法，对矿井可燃混合气体爆炸的抑制进行了探讨。 1．依据化学热力学、燃烧学、爆轰学以及工程热力学等基础知识，理论计算了可燃性气体一氧化碳、乙烷、氢气和甲烷的爆炸温度、最大爆炸压力以及由这些可燃性气体组成的多元混合气体的爆炸极限，从理论上分析了矿井可燃性气体的爆炸破坏力。 2．建立并完善了矿井可燃性混合气体爆炸过程的实验测试系统，从实验的角度得出了两组分混合气体、四组分混合气体的爆炸压力、最小氧浓度和临界氧浓度的爆炸特性以及变化规律，为指导实际的防治技术提供了有力的依据。 3．通过向可燃性混合气体的爆炸场中添加惰性介质的方法，探讨了矿井可燃性混合气体爆炸的抑制方法。研究结果表明，在单纯的抑制甲烷爆炸的基础上，实际的防范工作中要考虑到多种可燃性气体改变甲烷爆炸极限、爆炸压力、爆炸压力上升速率、安全含氧量等爆炸参数，将防范工作进一步严格，从而解决矿井可燃性混合气体爆炸的安全问题。

Fire damp explosion was one of the major disasters, a serious threat to the lives of works and enterprises. Because of the complexity of the underground environment, to a certain extent, it increased the extent of the damage and scope of the disaster. Other flammability gases besides methane in coal mine are participate in explosion during the fire damp explosion, and they extremely influence the explosion process. The flammability gases influence the fire damp explosion in many ways. This paper have studied the methane explosion identity of the flammability explosion that carbon monoxide, hydrogen and ethane are existed, and the influence disciplinarian on the basis of theoretical analysis and a lot of experiment data. In order to research the explosion suppressed technology of flammability gases, the method of adding inert materials to explosion field was applied to change the explosion limit. The conclusions were achieved as the following: 1. Through the theories of chemical thermodynamics, combustion, detonation and engineering thermodynamics, the natural parameters of explosion temperature, explosion pressure, and explosion limit were computed. So, we achieve the explosion identity in theory. 2. Experiment system of testing the explosion process of flammability explosive mixed gases has been established and improved. Through the test data, the influence laws on explosion pressure and its minimal oxygen concentration, critical oxygen concentration, initial pressure etc were achieved and comprised with the computed result. 3. The method of adding inert materials to explosion field was applied to study suppressing means of explosion of flammability explosion mixed gases. The test results show that other flammability gases can increase the methane risk factor, for example it can change the explosion limit, decrease the minimal oxygen concentration and increase the explosion pressure. Therefore, we must strictly do the work in practice and the safety problem of flammability explosive mixed gases was resolved.