Abstract
To study the effect of CO2 on the explosion characteristics of CH4/CO, the explosion experiments of the effect of different volume fractions of CO2 on CH4/CO deflagration were carried out by using the self-developed pipeline gas explosion experimental platform. The explosion characteristics of premixed gas are studied from the aspects of explosion peak pressure and time of reaching the peak pressure. The results show that the effect of CO on the deflagration of methane with a different volume fraction is the result of the interaction of the elementary reaction and the oxygen content in the reaction system. Two percent of the CO promoted the methane explosion in the oxygen-rich state, while it showed a damping effect in the oxygen-poor state. CO2 has different inhibitory effects on different volume fractions of methane. Experiments show that the addition of 20% CO2 can effectively inhibit the deflagration of methane. The addition of CO2 has a stronger inhibitory effect on the mixed gas of CH4/CO under the condition of poor oxygen but less on the mixed gas under the condition of rich oxygen.
Highlights
CO and CH4 are common gases encountered in chemical production and coal mines. If they are mixed with air, they can form explosive mixed gases under certain conditions
Because of the complexity of underground gas in coal mine and the wide use of multicomponent mixed gas in industrial production, explosion accidents of mixed combustible gas occur from time to time.[1−3] it has the characteristics of multiplication and recurrence, which are serious threats to the safety of people and property
Jia et al.[12,13] used the method of numerical simulation to analyze the kinetic process of the elementary reaction of CH4 explosion affected by H2 and CO and revealed their promotion and damping mechanism
Summary
CO and CH4 are common gases encountered in chemical production and coal mines. If they are mixed with air, they can form explosive mixed gases under certain conditions.Because of the complexity of underground gas in coal mine and the wide use of multicomponent mixed gas in industrial production, explosion accidents of mixed combustible gas occur from time to time.[1−3] it has the characteristics of multiplication and recurrence, which are serious threats to the safety of people and property. CO and CH4 are common gases encountered in chemical production and coal mines. If they are mixed with air, they can form explosive mixed gases under certain conditions. The dsteufldaigerdatbioynitsopf rethdeeceCsHso4r/sC.4−O8 gas mixture has been widely In terms of the promotion and damping effect of CO on gas explosion, Deng et al.[9,10] numerically simulated the explosion process of CH4/CO twocomponent combustible gas and explored the damping effect of CO on multicomponent gas. Jia et al.[12,13] used the method of numerical simulation to analyze the kinetic process of the elementary reaction of CH4 explosion affected by H2 and CO and revealed their promotion and damping mechanism. In the aspect of the influence of CO on the limit of gas explosion, Wang et al.[14] found that the addition of CO can restrain the explosion of CH4 to a certain extent after
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