氮气和水蒸气对瓦斯爆炸基元反应的影响及抑爆机理分析

Effect of Nitrogen and Water Vapor on Methane-Air Mixture Explosion Elementary Reaction and Suppression Mechanism

为了揭示氮气和水蒸气抑爆化学动力学机理,更有效地抑制瓦斯爆炸的发生,采用化学动力学软件研究了不同浓度氮气和水蒸气条件下瓦斯爆炸压力、温度和达到最大压力的时间,对比了不同浓度的氮气和水蒸气对瓦斯爆炸主要基元反应速率的影响,分析了氮气和水蒸气的抑爆机理。研究表明,氮气和水蒸气的加入能有效抑制瓦斯爆炸基元反应速率,水蒸气对基元反应速率的抑制效果优于氮气,且水蒸气的加入会增大系统中OH·自由基的含量。研究结果对揭示氮气和水蒸气的抑爆机理具有一定理论意义。

To reveal the suppression chemical mechanism of nitrogen and water and to prevent the methane-air explosion more effectively,we designed different schemes with different concentrations of nitrogen and water vapor, and simulated the pressure, temperature and time to peak pressure of the methane-air explosion using a chemical kinetic software. We compared the reaction rates of main ele- mentary reactions of different schemes, and analyzed the suppression chemical kinetics mechanism. The results show that both the nitrogen and the water vapor can effectively suppress the elementary reaction rate of the explosion, and the water vapor is more efficient than the nitrogen. Meanwhile, the concentration of free radical OH · will increase with water vapor as the inert gas. This research results can provide reference for the study of the explosion suppression of methane-air mixture.