CO、H_2混合气体对瓦斯爆炸的协同作用机理研究

Study on Synergistic Effect Mechanism of CO,H_2 Mixed Gas on Methane Explosion

为进一步研究多种可燃性气体对瓦斯爆炸的影响,选取CO、H_2混合气体并改变其构成组分,用CH_4燃烧化学动力学详细机理对其进行数值模拟,详细分析其对瓦斯爆炸的协同作用机理,并分析各组分下反应物浓度的变化趋势及影响瓦斯爆炸的关键链式反应的变化。研究结果表明:当CO浓度远大于H_2浓度时,随着CO浓度的增加,瓦斯爆炸反应物浓度变化时间会略有提前,且促进CH_4生成的链式反应敏感性会略微下降,其对瓦斯爆炸的影响不明显,但仍有一定的协同促进作用;当H_2浓度大于CO浓度时,随着H_2浓度的增加,瓦斯爆炸反应物浓度变化时间会快速提前,促进CH_4生成的链式反应敏感性会大幅下降,协同促进瓦斯爆炸。

In order to further study the effect of a variety of combustible gases on gas explosion, the detailed mechanisms of the CH4 combustion chemical kinetics was adopted to make numerical simulation by choosing CO, H2 mixed gas and chan- ging their components. The mechanisms of synergistic effect on methane explosion was analyzed in detail, and the change trend of reactant concentration of components and the change of key chain reactions influencing gas explosion were also ana- lyzed. The simulated results showed that the change time of reactant concentration about gas explosion was slightly in ad- vance with the increase of CO＇s concentration when the concentration of CO was greater than that of H2. and the chain reactions＇ sensitivity promoting the generation of CH4 decreased slightly, and its effect on gas explosion was not obvious, but there was still a certain synergy. While the concentration of H2 was greater than that of CO, the change time of reactant con- centration about gas explosion advanced quickly and the chain reactions＇ sensitivity promoting the generation of CH4 had fallen dramatically with the increase of H2,s concentration, and methane explosion was promoted collectively.