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通过实验研究了N2、CO2及CO2/N2(1∶2、1∶1、2∶1)的混合多元惰性气体对瓦斯最大爆炸压力及爆炸极限的影响。结果表明:甲烷的爆炸极限为5%~14%,当甲烷浓度为10%时,产生的最大爆炸压力最大,为0.278 4 MPa。惰性气体的加入使瓦斯的最大爆炸压力降低,爆炸极限范围缩小,且对瓦斯爆炸上限的影响要大于对爆炸下限的影响,对高浓度瓦斯体系的影响要大于对低浓度瓦斯体系的影响。加入N2、CO2/N2(1∶2、1∶1、2∶1)的混合气体和CO2时,对瓦斯爆炸的完全抑爆浓度分别为32%、25%和22%,抑爆效果由大到小依次是CO2,2∶1、1∶1、1∶2 CO2/N2的混合气体和N2。
The effects of mixed multiple inert gases of N2, CO2 and CO2 / N2 (1: 2, 1: 1, 2: 1) on the maximum explosion pressure and explosion limit were studied experimentally. The results show that the explosion limit of methane is 5% ~ 14%. When the concentration of methane is 10%, the maximum explosion pressure is 0.278 4 MPa. The addition of inert gas reduces the maximum explosion pressure of the gas, narrows the explosion limit range, and affects the upper limit of gas explosion more than the lower explosion limit. The effect on high concentration gas system is greater than that on low concentration gas system. When adding mixed gas of N2, CO2 / N2 (1: 2, 1: 1, 2: 1) and CO2, the complete explosion suppression concentrations of gas explosion were 32%, 25% and 22% To the order of CO2, 2: 1, 1: 1, 1: 2 CO2 / N2 mixed gas and N2.