Investigation of the effect of hydrogen addition on the combustion and emissions performance of high compression ratio liquid methane gas (LMG) Engine

IF 6.2 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute Pub Date : 2025-10-04 DOI:10.1016/j.joei.2025.102319

Kaimin Liu , Penghong Liao , Xiaopeng Feng , Jintao Zhou , Zhi Jiang , Hui Peng , Jiaji Jiang

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引用次数: 0

Abstract

To investigate the effect of hydrogen addition on the combustion and emission performance of a high-compression-ratio liquid methane gas (LMG) engine under continuously varying loads, this study considered an inline 6-cylinder 4-valve single-point injection spark ignition liquefied natural gas (LNG) engine as an object to comprehensively discuss the combustion process, engine performance, and emissions characteristics under different loads and speeds at different hydrogen energy share (HES) by means of coupled experiments and simulations. The results show, with an increase in hydrogen concentration, the brake-specific fuel consumption (BSFC) of the LMG engine showed a decreasing trend, the peak cylinder pressureincreased significantly, the maximum pressure rise rate also increased significantly, and the location of 50 % mass fraction burned (MFB) was advanced significantly. In terms of emissions, with the gradual increase in the hydrogen energy ratio, the NO_X emissions show an increasing trend and HC emissions showed a decreasing trend. With the increase in HES the location of peak combustion temperature (LPCT) advanced approximately 43.08 %. However, although the addition of hydrogen significantly increased the combustion rate of the LMG, the knocking became more intense as a result, and the tendency increased sharply when the HES increased from 12 % to 20 %.

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加氢对高压缩比液态甲烷（LMG）发动机燃烧和排放性能影响的研究

为研究连续变载荷下加氢对高压缩比液态甲烷（LMG）发动机燃烧与排放性能的影响，本研究以直列6缸4气门单点喷射火花点火液化天然气（LNG）发动机为研究对象，对燃烧过程、发动机性能、通过耦合实验和模拟，研究了不同负荷和速度下不同氢能量份额（HES）下的排放特性。结果表明：随着氢气浓度的增加，LMG发动机的制动比油耗（BSFC）呈下降趋势，汽缸峰值压力显著升高，最大压力上升速率也显著提高，50%质量分数燃烧（MFB）位置显著提前；在排放方面，随着氢能比的逐渐提高，NOX排放量呈增加趋势，HC排放量呈下降趋势。随着HES的增加，燃烧温度峰值位置（LPCT）提高了约43.08%。然而，氢气的加入虽然显著提高了轻燃发动机的燃烧速率，但却使爆震变得更加强烈，并且当氢气含量从12%增加到20%时，这种趋势急剧增加。

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

Journal of The Energy Institute 工程技术-能源与燃料

CiteScore

10.60

自引率

5.30%

发文量

166

审稿时长

16 days

期刊介绍： The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.