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Higher Alcohol and Ether Biofuels for Compression-Ignition Engine Application: A Review with Emphasis on Combustion Kinetics
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-01-20 , DOI: 10.1021/acs.energyfuels.0c03590 Liming Cai 1, 2 , Florian vom Lehn 2 , Heinz Pitsch 2
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-01-20 , DOI: 10.1021/acs.energyfuels.0c03590 Liming Cai 1, 2 , Florian vom Lehn 2 , Heinz Pitsch 2
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High molecular weight alcohol and ether fuels with their advanced autoignition propensities and oxygenated molecular structures are promising future fuel candidates for compression-ignition engine application, because they can provide improved combustion efficiencies and reduced pollutant emissions. In addition, their production from lignocellulosic biomass as second-generation biofuels offers an improved CO2 balance and avoids the adverse impact of the first-generation biofuel production on the food supply. This review aims to summarize the recent research progress on the combustion of long-chain alcohols and ethers with more than four carbon atoms, putting a particular emphasis on their fundamental combustion kinetics. The article starts with aspects related to their production routes, physical and chemical properties, and practical applications, highlighting the resulting consequences for their potentials as renewable fuels in comparison with conventional diesel fuels. This is followed by a comprehensive evaluation of their fundamental ignition and combustion characteristics. The existing chemical mechanisms for the oxidation of higher alcohols and ethers are introduced in conjunction with discussions of their development approaches. Their reaction kinetics are further explored to understand the dependence of their combustion behaviors on the molecule’s structural features, such as functional groups and carbon chain length. In particular, the different influences of the molecule size on the cetane numbers of longer alcohols and ethers are analyzed. The review finishes with a discussion suggesting directions for future experimental and numerical investigations, which will allow deepening of the understanding of the combustion kinetics of higher alcohol and ether fuels.
中文翻译：
用于压燃发动机的高级醇和醚生物燃料：着重于燃烧动力学的综述
具有先进的自燃倾向和含氧分子结构的高分子量醇和醚燃料有望成为未来压燃式发动机应用的候选燃料，因为它们可以提供更高的燃烧效率并减少污染物排放。此外，它们由木质纤维素生物质作为第二代生物燃料生产可提供改善的CO 2平衡并避免第一代生物燃料生产对食品供应的不利影响。这篇综述旨在总结最近燃烧具有四个以上碳原子的长链醇和醚的研究进展，特别强调其基本燃烧动力学。本文从与它们的生产路线，物理和化学性质以及实际应用相关的方面入手，重点介绍了与常规柴油相比，其作为可再生燃料的潜力所产生的后果。接下来是对其基本点火和燃烧特性的综合评估。结合对高级醇和醚的开发方法的讨论，介绍了现有的氧化高级醇和醚的化学机理。进一步探索其反应动力学，以了解其燃烧行为对分子结构特征（如官能团和碳链长度）的依赖性。特别地，分析了分子大小对更长的醇和醚的十六烷值的不同影响。审查以讨论结束，为未来的实验和数值研究提出了方向，这将使人们对高级醇和醚燃料的燃烧动力学有更深的了解。
更新日期：2021-02-04
中文翻译：
用于压燃发动机的高级醇和醚生物燃料：着重于燃烧动力学的综述
具有先进的自燃倾向和含氧分子结构的高分子量醇和醚燃料有望成为未来压燃式发动机应用的候选燃料，因为它们可以提供更高的燃烧效率并减少污染物排放。此外，它们由木质纤维素生物质作为第二代生物燃料生产可提供改善的CO 2平衡并避免第一代生物燃料生产对食品供应的不利影响。这篇综述旨在总结最近燃烧具有四个以上碳原子的长链醇和醚的研究进展，特别强调其基本燃烧动力学。本文从与它们的生产路线，物理和化学性质以及实际应用相关的方面入手，重点介绍了与常规柴油相比，其作为可再生燃料的潜力所产生的后果。接下来是对其基本点火和燃烧特性的综合评估。结合对高级醇和醚的开发方法的讨论，介绍了现有的氧化高级醇和醚的化学机理。进一步探索其反应动力学，以了解其燃烧行为对分子结构特征（如官能团和碳链长度）的依赖性。特别地，分析了分子大小对更长的醇和醚的十六烷值的不同影响。审查以讨论结束，为未来的实验和数值研究提出了方向，这将使人们对高级醇和醚燃料的燃烧动力学有更深的了解。
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