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本文利用组分浓度敏感性分析法结合生成速率分析法,对甲烷动力学反应机理进行了简化,构建出一套含有18种组分、34步基元反应的简化机理。利用该简化机理与完整机理分别在瞬态及稳态零维均质模型中对低浓度甲烷反应过程进行了计算,并将计算结果进行了对比分析,结果表明在大尺度贫燃料区范围内简化机理与完整机理的计算结果吻合度较高,简化机理具有较高的精度。同时利用该简化机理在柱塞流模型中对低浓度甲烷均相反应程进行了预测,并与定温反应器中的实验结果进行了对比研究,实验结果证实简化机理对低浓度甲烷反应过程预测效果较好,该简化机理适用于计算低浓度甲烷均相反应过程。
In this paper, the reaction mechanism of methane kinetics is simplified by the method of component concentration sensitivity analysis and the formation rate analysis method, and a set of simplified mechanism of 18-element reaction with 34 steps is constructed. Using the simplified mechanism and the complete mechanism, the low concentration methane reaction process was calculated in the transient and steady-state zero-dimensional homogeneous model, and the calculation results were contrastively analyzed. The results show that in the range of large-scale lean fuel area, The agreement between the mechanism and the calculation result of the complete mechanism is high, and the simplified mechanism has high precision. At the same time, the simplified mechanism was used to predict the homogeneous reaction of low concentration methane in the plug flow model, and compared with the experimental results in the constant temperature reactor. The experimental results confirm that the simplified mechanism can predict the prediction effect of low concentration methane reaction process Preferably, this simplified mechanism is suitable for the calculation of the homogeneous methane reaction at low concentrations.