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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Combustion and emission characteristics of methanol/diesel dual-fuel engine

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甲醇/柴油双燃料发动机燃烧与排放特性研究

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Sept.2024, Vol.47 No.9: 1183-1190

DOI: 10.3969/j.issn.1003-5060.2024.09.005

Authors

SHEN Lizhong, ZHAO Jingping, HUANG Fenlian, WAN Mingding

(Yunnan Province Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming 650500, China)

Abstract and Keywords

Abstract: The investigation of the effects of the methanol substitution ratio and the pilot injection timing on the combustion and emission characteristics of methanol/diesel dual-fuel engine at low and medium load conditions were conducted on a modified turbocharged four-cylinder engine. The results show that at low load, the indicated thermal efficiency of dual-fuel mode is lower than that of pure diesel mode, the incomplete combustion increases, and the emissions of total hydrocarbons (THC), carbon monoxide (CO), unburned methanol and formaldehyde increase with the increase of the methanol substitution ratio. Advancing the pilot injection timing can improve the indicated thermal efficiency of the dual-fuel mode and reduce THC, CO, unburned methanol and formaldehyde emissions, but it will sharply increase nitrogen oxides ( $ NO_{x} $) emissions. At medium load, as the methanol substitution ratio increases, the indicated thermal efficiency first increases and then decreases for too much methanol lowers the initial temperature in the cylinder, which deteriorates the combustion. With the advancement of pilot injection timing, the emissions of THC, CO, unburned methanol and formaldehyde are reduced, but the reduction is less than that at low load. At the same time, $ NO_{x} $ emissions increase sharply.

Keywords: methanol; diesel; reactivity controlled compression ignition(RCCI); injection advance angle; emissions

作者信息

申立忠，赵静平，黄粉莲，万明定

（昆明理工大学云南省内燃机重点实验室，云南昆明650500）

摘要和关键词

摘要: 文章在一台增压中冷高压共轨电控发动机上研究低、中负荷工况下替代率、喷油正时对双燃料发动机燃烧及排放特性的影响。研究结果表明:低负荷工况下,双燃料热效率低于纯柴油,不完全燃烧现象增多,碳氢化合物(THC)、一氧化碳(CO)、未燃甲醇和甲醛排放均随着替代率的上升而上升,随着喷油正时的提前,双燃料模式的热效率有所改善,THC、CO、未燃甲醇和甲醛排放降低,氮氧化物 $ \left(NO_{x}\right) $排放急剧上升;中负荷工况下,随着替代率的升高,由于过多的甲醇降低了缸内初始温度,使得缸内燃烧恶化,热效率先升高后降低,随着喷油正时的提前,THC、CO、未燃甲醇和甲醛的排放有所降低,但降低幅度小于低负荷工况,同时喷油正时的提前会导致 $ NO_{x} $排放急剧增加。

关键词: 甲醇；柴油；反应活性控制压燃；喷油提前角；排放

Funding

国家自然科学基金资助项目（52066008）；云南省科技计划资助项目（2016FD034）

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