惰性气体N_2/CO_2抑制瓦斯爆炸实验研究

Experimental study on coal mine gas explosion suppression with inert gas N_2/CO_2

为探究惰性气体(N_2和CO_2)对瓦斯气体爆炸影响,采用中型尺寸瓦斯爆炸实验装置,在N_2及CO_2体积分数为0%、9%、14%工况下开展了瓦斯爆炸实验研究,获取了N_2和CO_2对矿井瓦斯抑爆特性的影响规律,并针对瓦斯爆炸过程中惰性气体N_2和CO_2对爆炸超压变化的影响及爆炸抑制效果进行了对比分析。结果表明:随着初始混合气体中惰性气体N_2或CO_2含量的升高,瓦斯爆炸超压均明显降低,CO_2的抑爆效果优于N_2;N_2和CO_2对较高浓度瓦斯气的抑爆效果更为显著。

To determine the effect of inert gas （N2 and CO2） on the process of mine gas explosion, we carried out mine gas explosion experiments in a medium-size pipe with the volume fractions of N2 or CO2 filled in three components of mine gas samples which were respectively 0%, 9%and 14%, and successfully obtained the explosion suppression characteristics of N2 and CO2. Then we conducted comparative analysis of the explosion overpressure histories and explosion suppression capacity of in ert gas N2 and CO2 in the gas explosion process. The results show that the gas explosionoverpressure decreases significantly with the increase of N2 or CO2 volume fraction in the mixed gases, and the ex plosion suppression capacity of CO2 is better than that of N2. Moreover, the explosion suppression effect of N2 and CO2 is much more obvious when the gas sample has a higher CH4, concentration.