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为探索受限空间中瓦斯爆炸及氢气对爆炸过程的影响,采用GRI-Mech 3.0甲烷燃烧机理,建立受限空间中瓦斯爆炸的数学模型,应用CHEMKIN软件,对受限空间内瓦斯爆炸过程及氢气对反应物浓度、活化中心浓度、主要致灾性气体浓度的影响进行模拟分析。通过对反应机理的敏感性分析,找出影响瓦斯爆炸及爆炸后主要致灾性气体生成的关键反应步。结果表明:混合气中分别充入0.5%,2%,3.5%氢气时,爆炸时间分别提前0.005 7,0.010 5,0.011 1 s;爆炸后压力分别提高2.53,4.05,7.60 kPa;爆炸后温度分别提高20,60,100 K。由此可见,随着混合气中氢气含量的增加,瓦斯引爆时间越来越短,其爆炸强度也随之增大,且氢气在一定程度上对有害气体CO,CO2,NO,NO2的生成有很大影响。
In order to explore the impact of gas explosion in confined space and the impact of hydrogen on the explosion process, a mathematical model of gas explosion in confined space was established by using GRI-Mech 3.0 methane combustion mechanism. The CHEMKIN software was used to simulate the gas explosion in confined space and hydrogen The effects of reactant concentration, activation center concentration and main disastrous gas concentration were simulated. Through the sensitivity analysis of the reaction mechanism, identify the key reaction steps that affect the gas explosion and the main disastrous gases after the explosion. The results show that the explosive time is 0.005 7,0.010 5 and 0.011 1 s respectively when the mixture is filled with 0.5%, 2% and 3.5% hydrogen respectively; the post-explosion pressures increase by 2.53, 4.05 and 7.60 kPa respectively; Increase by 20,60,100 K. It can be seen that with the increase of hydrogen content in the mixture, the detonation time of gas is getting shorter and shorter, the explosion intensity also increases, and the generation of harmful gases such as CO, CO2, NO and NO2 to a certain extent Great influence.