An effort to enhance methanol energy in a diesel engine under dual fuel mode using pilot injection strategy coupled with exhaust gas recirculation

IF 7.5 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2025-02-12 DOI:10.1016/j.fuel.2025.134655

Jinhong Shi, Zhifei Wu, Ruiliang Zhang, Zhengwu Fan

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引用次数: 0

Abstract

The methanol/indirect coal to liquid (ICTL) dual fuel mode was realized by direct injection of ICTL as high-reactivity fuel to ignite methanol as low-reactivity fuel in a diesel engine. However, HC, CO and the coefficient of variation of pressure (COVp) increases significantly with the increase of methanol alternative ratio (MAR) under low speed and light load condition. Based on methanol/ICTL dual fuel test bench, the effects of MAR and pilot injection strategy coupled with exhaust gas recirculation (EGR) on engine performances at a constant engine speed of 1000r/min and 60Nm were assessed to improve engine performance as well as to reduce cyclic fluctuation rate. The results display that ignition delay (ID) is prolonged, combustion duration (CD) is decreased, the corresponding crank angle of 50 % (CA50) is advanced, maximum cylinder pressure and heat release rate (HRR) decrease, SOOT and NOx emission are decreased, but HC and CO emission increase with the increase of MAR, and the COVp reaches 4.8 % when the MAR is 15.2 %. When the start of pilot injection (SOI_pilot) is −29 ^oCA and pilot injection quantity (PIQ) is fixed at 1.8 mg/cyc, SOOT, HC and CO emission are further reduced, but NOx emission is increased. Moreover, the pilot injection strategy can reduce COVp by shortening ID and CD to strengthen the control of the CA50 phase and improve the activity of mixture. With the appropriate EGR ratio combined with the optimized pilot injection strategy, the SOOT emission is decreased by 53.6 %, NOx emission is increased by 31.4 %, HC and CO emission are gradually increased but at a very low level, and COVp is decreased from 4.8 % to 2.99 %. The results in this paper can promote the diesel engine to low carbon emission and provide theoretical guidance for the application of methanol and ICTL.

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采用先导喷射策略与废气再循环相结合，提高双燃料模式下柴油发动机甲醇能量的研究

通过直接喷射高反应性的煤转液（ICTL）来点燃低反应性的甲醇，实现了甲醇/煤转液（ICTL）双燃料模式。而在低速和轻载条件下，HC、CO和压力变化系数（COVp）随着甲醇替代比（MAR）的增加而显著增加。基于甲醇/ICTL双燃料试验台，在发动机转速为1000r/min、转速为60Nm的恒定工况下，以提高发动机性能和降低循环波动率为目的，评估了MAR和先导喷射策略结合废气再循环（EGR）对发动机性能的影响。结果表明：点火延迟（ID）延长，燃烧持续时间（CD）降低，相应的曲柄角（CA50）提前50%，最大气缸压力和放热率（HRR）降低，SOOT和NOx排放量降低，但HC和CO排放量增加，当MAR为15.2%时，COVp达到4.8%。当启动先导喷射（soippilot）为−29 oCA时，将先导喷射量（PIQ）固定在1.8 mg/cyc时，进一步降低了SOOT、HC和CO排放量，但增加了NOx排放量。此外，中试注入策略可以通过缩短ID和CD来降低COVp，加强对CA50相的控制，提高混合物的活性。采用适当的EGR比和优化后的中试喷射策略，烟尘排放量降低53.6%，NOx排放量增加31.4%，HC和CO排放量逐渐增加，但增幅很小，COVp从4.8%降至2.99%。本文的研究结果可以促进柴油机向低碳排放方向发展，为甲醇和ICTL的应用提供理论指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.