Numerical Simulation Research on Combustion and Emission Characteristics of Diesel/Ammonia Dual-Fuel Low-Speed Marine Engine

Qinran Wu, Xingyu Liang (), Zhijie Zhu, Lei Cui and Teng Liu
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Qinran Wu: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Xingyu Liang: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Zhijie Zhu: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Lei Cui: China Ship Power Institute Co., Ltd., Shanghai 201206, China
Teng Liu: China Ship Power Institute Co., Ltd., Shanghai 201206, China

Energies, 2024, vol. 17, issue 12, 1-19

Abstract: Amid increasingly stringent global environmental regulations, marine engines are undergoing an essential transition from conventional fossil fuels to alternative fuels to meet escalating regulatory requirements. This study evaluates the effects of injection pressure, the timing of ammonia injection, and the pre-injection of ammonia on combustion and emissions, aiming to identify optimal operational parameters for low-speed marine engines. A three-dimensional model of a large-bore, low-speed marine engine in a high-pressure diffusion mode was developed based on computational fluid dynamics (CFD). Simulations were conducted under 25%, 50%, 75% and 100% loads with a high ammonia energy substitution rate of 95%. The results indicate that, compared to traditional pure diesel operation, adjusting the injection pressure and the ammonia injection timing, along with employing appropriate pre-injection strategies, significantly enhances in-cylinder pressure and temperature, improves thermal efficiency, and reduces specific fuel consumption. Additionally, the dual-fuel strategy using diesel and ammonia effectively reduces nitrogen oxide emissions by up to 37.5% and carbon dioxide emissions by 93.7%.

Keywords: marine engines; ammonia fuel; dual-fuel engine; emissions (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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