【摘要】 用热重分析仪对O₂和NO₂气氛下柴油机炭烟的氧化过程进行了试验研究,并利用程序升温氧化（TPO）试验对其化学反应动力学参数进行了研究,建立了O₂和NO₂气氛下柴油机炭烟氧化过程的化学反应动力学模型,并用模型对O₂和NO₂对炭烟的氧化效果进行了对比分析。研究结果表明:柴油机炭烟在O₂气氛下大约从700K时开始氧化,氧化反应的活化能为76.8kJ/mol,对O₂的反应级数为0.85;而在NO₂气氛下大约从600K时开始氧化,氧化反应的活化能为21.9kJ/mol,对NO₂的反应级数为0.85。在柴油机排气组分条件下,当温度低于750K时,NO₂氧化炭烟引起的炭烟质量减少占主导;而当温度高于800K时,O₂氧化炭烟引起的炭烟质量减少占主导。更多还原

【Abstract】 The diesel soot oxidation processes in the environment of O₂ and NO₂ were researched with thermogravimetric analyzer,the chemical reaction kinetic parameters were analyzed by temperature programmed oxidation test,the chemical reaction kinetic model of diesel soot oxidation process in the environmentof O₂ and NO₂ was established,and the soot oxidation effects of O₂ and NO₂ were compared and analyzed with the model.The results show that the diesel soot begins to oxidize at 700Kand600 Kand the oxidation reaction activation energy is 76.8kJ/mol and 21.9kJ/mol in the presence of O₂ and NO₂respectively.,The reaction order of O₂ and NO₂are both 0.85.In the exhaust of diesel engine,the soot mass reduction depends on NO₂ oxidation reaction below 750 K,but on O₂ oxidation reaction beyond 800 K.更多还原