Effect of Gas Concentration on Kinetic Characteristics of Gas Explosion in Confined Space
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摘要: 为了研究瓦斯浓度对瓦斯爆炸反应动力学特性的影响,利用定容反应器模型,对不同瓦斯浓度情况下的瓦斯爆炸反应进行了模拟研究。研究结果表明:随着初始瓦斯浓度的增加,瓦斯爆炸的最终温度先升后降,压力逐渐升高;·OH、H·和O·自由基摩尔分数先升后降;残余的CH4摩尔分数缓慢增加,O2摩尔分数缓慢减少至零。瓦斯爆炸的最佳反应浓度比化学计量浓度要高,大约在10%~12%之间,此时爆炸后体系中温度达到最大值。在化学当量比情况下,对甲烷和氧气的消耗、自由基(O·和H·)的生成起促进作用的关键基元反应步为R32、R38、R85、R118、R119、R155、R156、R157;对甲烷和氧气的产生、自由基(O·和H·)的消减起促进作用的关键基元反应步为R53、R158。Abstract: To study the effect of gas concentration on kinetic characteristics of gas explosion in a closed space, we simulated the gas explosion with different gas concentrations using a constant volume reactor model.The results show that with the increase of the initial gas concentration, the final temperature increases at first till its maximum and then decreases, and the pressure increases continuously; the concentrations of ·OH, H· and O· increase at first to the maximum and then decrease; the remnants of CH4 increase slowly and those of O2 are gradually reduced to zero.For gas explosion, the optimum reaction concentration (about 10%-12%) is higher than the stoichiometric mole fraction and the temperature reaches the maximum at this time.In the case of the stoichiometric mole fraction, the primitive reactions which contribute to the consumption of methane and oxygen and the generation of free radical (O· and H·) is R32, R38, R85, R118, R119, R155, R156, R157;the primitive reactions which contribute to the generation of methane and oxygen and the reduction of free radical (O· and H·) are R53 and R158.
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Key words:
- gas explosion /
- gas concentration /
- simulation /
- the key elementary reaction step (TKER)
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表 1 初始模拟计算条件
Table 1. Initial conditions of simulation
Working condition Initial temperature/(K) Initial pressure/(MPa) Mole fraction/(%) Calculating time/(ms) CH4 O2 N2 1 1 200 0.09 6.00 19.74 74.26 100 2 1 200 0.09 9.50 19.00 71.50 100 3 1 200 0.09 14.00 18.06 67.94 100 -
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