Exploring the low-temperature oxidation chemistry with ozone addition in an RCM: A case study on ethanol
Exploring the low-temperature oxidation chemistry with ozone addition in an RCM: A case study on ethanol
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探索 RCM 中添加臭氧的低温氧化化学：乙醇的案例研究
DOI：
10.1016/j.combustflame.2021.111727
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发表时间：
2021-09
影响因子：
4.4
通讯作者：
Bin Yang
中科院分区：
文献类型：
--
作者：
Wanxiong Liao;Shiqing Kang;Zhaohan Chu;Zhongkai Liu;Yiru Wang;Bin Yang
一些燃料的低反应性限制了它们在低于特定阈值的温度下的氧化实验。在实际燃烧室中，在超过该阈值的较低温度下，其他高反应性组分可引发表现出低反应性的燃料的氧化。为了弥补相关实验研究的不足，利用臭氧（O3）作为活性物种，将实验条件向低温方向扩展。研制了一套将O3系统与快速压缩机（RCM）相结合的实验装置，实现了RCM中O3的产生和定量。RCM-O3装置可用于直接研究高压条件下O3存在下的点火行为，并提供时间分辨的物种信息。作为案例研究，在纯乙醇不能自燃的低温条件下（<820 K），乙醇的氧化和着火行为进行了研究。在769-1036 K温度范围内，测定了不同O3浓度（0 ppm，1000 ppm，2000 ppm）的乙醇/O2混合物在15和25 bar压力下的着火延迟时间。在点火过程中得到的时间分辨物种配置文件。一个快速采样系统和气相色谱（GC）技术的组合被用来记录物种配置文件在840 K和802 K在O3的存在下。模型分析表明，O3的加入促进了OH自由基的产生。体系的反应活性不受O3存在下H2 O2分解的限制。乙醇的OH自由基夺氢反应在很大程度上得到了重视。O3作为添加剂对反应网络没有明显影响，实验结果能够很好地表征乙醇基化学反应。OH自由基对乙醇α位和β位的吸氢作用对着火反应有相反的影响，反应对的分支比受到限制。
The low reactivity of some fuels restricts their oxidation experiments at temperatures lower than a specific threshold value. The oxidation of fuel exhibiting low reactivity can be initiated in practical combustors by other highly reactive components at lower temperatures beyond this threshold. To meet the lack of corresponding experimental study, ozone (O3) was utilized as the active species to extend experimental conditions towards lower temperatures. A new experimental facility combining an O3system and a rapid compression machine (RCM) was developed, with which the generation and qualification of O3in the RCM was achieved. The RCM-O3facility can be used to directly investigate the ignition behavior and provide time-resolved species information in the presence of O3under high-pressure conditions. As a case study, the oxidation and ignition behavior of ethanol were investigated under low-temperature conditions (<820 K) where the auto-ignition of pure ethanol cannot be initiated. Ignition delay times for stoichiometric ethanol/O2mixtures containing varying concentrations of O3(0 ppm, 1000 ppm, and 2000 ppm) were determined in the temperature region of 769–1036 K under the pressures of 15 and 25 bar. Time-resolved species profiles were obtained during the ignition process. A combination of a fast sampling system and gas chromatography (GC) technique was used to record the species profiles at 840 K and 802 K in the presence of O3. Model analysis revealed that the addition of O3promoted the production of OH radicals. The reactivity of the system was not restricted by the decomposition of H2O2in the presence of O3. The hydrogen-abstraction reactions of ethanol by OH radicals were highlighted to a great extent. The reaction network was not significantly affected when O3was used as the additive, which makes the experimental results can well characterize ethanol-based chemistry. The H-abstractions atα- andβ-site of ethanol by OH radicals showed opposite effects on ignition, and the branching ratio of the reaction pair was constrained according to experimental results in this work.
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