Xu Ping, Wang Rui, Ding Tao, Tang Weixin, Zhang Changhua
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China.
College of Chemical Engineering, Sichuan University, Chengdu 610065, China.
ACS Omega. 2022 Mar 4;7(10):9044-9052. doi: 10.1021/acsomega.2c00275. eCollection 2022 Mar 15.
As one of the simplest polyols with chemical properties of alcohol, ethylene glycol is considered as a renewable energy source and a model fuel for pyrolysis oil. In this work, autoignition characteristics of ethylene glycol have been investigated behind reflected shock waves. Experiments were conducted at pressures of 2, 5, and 10 atm, equivalence ratios of 0.5, 1.0, and 2.0, and temperatures ranging from approximately 1200 to 1600 K. The fuel concentration was also varied. Results show that the ignition delay time increases with decreasing the pressure or fuel concentration. A strong positive dependence upon the equivalence ratio was found. A quantitative relationship has been yielded by the regression analysis of the experimental data. Simulations were carried out using chemical kinetic mechanisms available in the literature to assess the reliability of mechanism. Reaction pathway and sensitivity analysis confirmed the importance of H-abstraction reactions in ethylene glycol oxidation process. Finally, a comparison between ethylene glycol and ethanol ignition was conducted. Ethylene glycol ignites faster than ethanol because of the early accumulation of H and OH radicals in the oxidation of ethylene glycol.
作为具有醇类化学性质的最简单多元醇之一，乙二醇被视为一种可再生能源和热解油的模型燃料。在这项工作中，研究了乙二醇在反射激波后的自燃特性。实验在2、5和10个大气压、当量比为0.5、1.0和2.0以及温度范围约为1200至1600K的条件下进行。燃料浓度也有所变化。结果表明，点火延迟时间随压力或燃料浓度的降低而增加。发现其对当量比有很强的正相关性。通过对实验数据的回归分析得出了定量关系。使用文献中可用的化学动力学机制进行了模拟，以评估该机制的可靠性。反应路径和敏感性分析证实了氢提取反应在乙二醇氧化过程中的重要性。最后，对乙二醇和乙醇的点火进行了比较。由于乙二醇氧化过程中氢和羟基自由基的早期积累，乙二醇比乙醇点火更快。
