Experiment and simulation on oxidation characteristics of natural gas
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摘要:
在流动管反应器中对压力为0.1 MPa、温度范围为500~1 850 K、当量比分别为0.5、1.0与3.5的工况条件下天然气（90%甲烷/7%乙烷/3%丙烷，体积分数）的氧化过程进行了实验测试。同时，通过全局敏感性分析方法，构建了天然气的简化反应动力学机理（38组分和149反应），并对天然气的氧化特性进行了数值计算。结果表明：随着当量比增大，燃料发生氧化反应的起始温度与终止温度逐渐升高，CO生成与消耗完全对应的反应温度逐渐升高，NO的生成量逐渐降低。天然气的简化反应机理可以很好地预测天然气氧化过程中主要组分摩尔分数随温度变化的整体趋势；但是在C3H8、C2H2、NO、NO2的起始反应温度或摩尔分数峰值的预测上与相应实验值存在差异。
Abstract:The oxidation of natural gas （90% methane/7% ethane/3% propane，volume fraction） was experimentally tested in the flow reactor under the conditions of the pressure of 0.1 MPa，the temperature range of 550-1 850 K，the equivalence ratios of 0.5，1.0 and 3.5.Meanwhile，through the global sensitivity analysis，the reduced reaction kinetic mechanism of the natural gas （including 38 species and 149 reactions） was established，and the oxidation characteristics of the natural gas were simulated.The results showed that，with the increase of equivalent ratio，the starting and ending temperatures of fuel oxidation reaction gradually rose，the reaction temperature of CO generation and complete consumption raised，and the production of NO reduced.The reduced reaction mechanism of the natural gas had a good prediction of the variational trends of the mole fractions of the main species with temperature during the oxidation of the natural gas.However，there existed still some deviations in the prediction of the starting reaction temperature or the peak mole fractions of some species，such as C3H8，C2H2，NO and NO2.
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图 4 天然气氧化过程中的主要组分摩尔分数随温度的变化趋势（
=0.5） Figure 4. Variation trend of the mole fraction of main species with temperature in the oxidation of nature gas （
=0.5） 
图 5 天然气氧化过程中的主要组分摩尔分数随温度的变化趋势（
=1.0） Figure 5. Variation trend of the mole fraction of main species with temperature in the oxidation of nature gas （
=1.0） 
图 6 天然气氧化过程中的主要组分摩尔分数随温度的变化趋势（
=3.5） Figure 6. Variation trend of the mole fraction of main species with temperature in the oxidation of nature gas （
=3.5） 表 1 实验工况及气体组成
Table 1. Experiment conditions and gas compositions
当量比 摩尔分数 CH4 C2H6 C3H8 O2 N2 He 0.5 0.040 5 0.003 15 0.001 35 0.197 550 0.743 183 0.014 267 1.0 0.040 5 0.003 15 0.001 35 0.098 775 0.371 592 0.484 633 3.5 0.040 5 0.003 15 0.001 35 0.028 221 0.106 169 0.820 610 
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