Recent progress in the application in compression ignition engines and the synthesis technologies of polyoxymethylene dimethyl ethers
Recent progress in the application in compression ignition engines and the synthesis technologies of polyoxymethylene dimethyl ethers
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DOI：
10.1016/j.apenergy.2018.10.064
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发表时间：
2019-01-01
期刊：
影响因子：
11.2
通讯作者：
Wang, Jianxin
中科院分区：
文献类型：
--
作者：
Liu, Haoye;Wang, Zhi;Wang, Jianxin
聚甲醛二甲醚（PODE）具有比大多数使用的含氧燃料更高的十六烷值和氧含量。因此，PODE被认为是压燃式发动机的有前途的燃料替代品，并且已经在压燃式发动机中被深入研究。近5年来，随着我国PODE工业化生产技术的突破，PODE的性能测试、合成技术及其在压燃式发动机上的应用得到了广泛的研究。本文综述了PODE合成技术在我国的发展情况和国内外在压燃式发动机上的应用情况。综合了不同聚合度PODE的性能测试结果及PODE对柴油共混物性能的影响。讨论了目前已实现工业化生产的合成技术和未来可能的合成技术。此外，还讨论了PODE在柴油机常规燃烧模式和新型压缩模式下的应用结果。最后，PODE氧化机制的初步结果进行了论证。在PODE的所有聚合物中，PODE 4 -5具有更好的发动机应用性能。将PODE掺混到柴油中适度地增加燃料十六烷值。PODE在传统和新型压燃模式下的燃烧和排放特性得到了大量的实验研究。由于分子结构中不存在C-C键，避免了烯烃的生成途径，因此具有更大的碳烟减排潜力。虽然PODE的合成已经取得了显著的成就，但甲醇/甲醛合成PODE的实现仍然需要研究。
Polyoxymethylene dimethyl ethers (PODE) have higher cetane number and oxygen content than mostly used oxygenated fuels. Thus, PODE are believed to be a promising fuel substitute for compression ignition engines and have been intensively studied in compression ignition engines. In recent 5 years, due to the technical breakthrough for industrialized production of PODE in China, PODE property measurement, synthesis technology and application in compression ignition engines have been investigated extensively. This article summarizes the findings concerning PODE synthesis mainly in China and PODE application in compression ignition engines around the world. The measuring results of properties of PODE with different polymerization degrees and effects of PODE on the properties of PODE/diesel blends are integrated. Then, the present synthesis technologies which have realized industrialized production and the potential synthesis technologies in future are discussed. Furthermore, the results of application of PODE in the conventional diesel combustion mode and new compression modes are discussed. Finally, the preliminary findings of PODE oxidation mechanism are demonstrated. In all the polymers of PODE, PODE4-5 exhibit better properties for engine application based on measuring data. Blending PODE into diesel increases fuel cetane number moderately. PODE have been proved to improve combustion and emission characteristics both in conventional and new compression ignition modes in most of the experimental investigations. The absence of C-C bond in the molecule structure, avoiding the pathways of the formation of alkenes, provides more potential in reducing soot emissions. Although significant achievements have been achieved in the synthesis of PODE, realization of PODE synthesis from methanol/formaldehyde still need to be investigated.