用于 CI 发动机的木质素燃料实验研究

Motoki Terauchi, Tor Simonsen, Simon Mortensen, Jesper Schramm, Anders Ivarsson
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摘要

本研究探讨了在传统压燃式 (CI) 船用发动机中使用可持续木质素基燃料的可行性,这种燃料由 44% 的木质素、50% 的乙醇和 6% 的水组成。通过在改装的小口径 CI 发动机上进行实验评估,我们确定了与木质素基燃料相关的主要挑战,包括燃料系统内溶剂蒸发和木质素凝固导致的发动机启动和关闭问题,以及汽缸壁上沉积物的形成导致活塞环卡死。为解决这些问题,我们开发了一种燃料转换系统,从木质素燃料过渡到含有 85 Vol% 丙酮、10 Vol% 水和 5 Vol% 点火改进添加剂的清洁燃料,有效防止了系统堵塞。此外,通过优化喷射参数、采用恒压出油阀和微调喷射时间,缓解了因燃烧不完全或喷嘴穿透汽缸壁而形成的木质素沉积物。木质素基燃料在小孔径 CI 发动机中的成功燃烧在很大的燃烧室温度范围内都得到了证实。使用阿伦尼乌斯方程测量和分析了点火延迟。木质素燃料的点火质量与十六烷值为 18.2 的 1-戊醇相当,这对于二冲程船用发动机来说是可以接受的。虽然还需要进一步调查以评估其长期可靠性,但我们的研究结果凸显了木质素燃料作为船用发动机可行替代燃料的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental Study of Lignin Fuels for CI Engines
This study explores the feasibility of using a sustainable lignin-based fuel, consisting of 44 % lignin, 50 % ethanol, and 6 % water, in conventional compression ignition (CI) marine engines. Through experimental evaluations on a modified small-bore CI engine, we identified the primary challenges associated with lignin-based fuel, including engine startup and shutdown issues due to solvent evaporation and lignin solidification inside the fuel system, and deposit formation on cylinder walls leading to piston ring seizure. To address these issues, we developed a fuel switching system transitioning from lignin-based fuel to cleaning fuel with 85 vol% of acetone, 10 vol% of water and 5 vol% of ignition improving additive, effectively preventing system clogs. Additionally, optimizing injection parameters, adopting a constant pressure delivery valve, and fine-tuning injection timing mitigated lignin deposit formation related to incomplete combustion or spray tip penetration to the cylinder wall. The successful combustion of the lignin-based fuel in the small-bored CI engine was confirmed in a wide range of chamber temperatures. The ignition delay was measured and analyzed using Arrhenius equation. The ignition quality of the lignin fuel was comparable with 1-pentanol with a cetane number of 18.2, which is acceptable for 2-stroke marine engines. Although further investigation is needed to assess long-term reliability, our findings underscore the potential of lignin-based fuel as a viable alternative fuel for marine engines.
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