The Impact of Diesel Injection Strategy and In-Cylinder Temperature on the Combustion and Emissions of Ammonia/Diesel Dual-Fuel Marine Engine

Wei Guan, Songchun Luo, Jie Wu, Hua Lou, Lei Wang, Feng Wu, Li Li, Fuchuan Huang and Haibin He ()
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Wei Guan: Ningbo C.S.I. Power & Machinery Group Co., Ltd., Ningbo 315020, China
Songchun Luo: School of Mechanical Engineering, Guangxi University, Nanning 530004, China
Jie Wu: Ningbo C.S.I. Power & Machinery Group Co., Ltd., Ningbo 315020, China
Hua Lou: Ningbo C.S.I. Power & Machinery Group Co., Ltd., Ningbo 315020, China
Lei Wang: Ningbo C.S.I. Power & Machinery Group Co., Ltd., Ningbo 315020, China
Feng Wu: College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
Li Li: School of Mechanical Engineering, Guangxi University, Nanning 530004, China
Fuchuan Huang: School of Mechanical Engineering, Guangxi University, Nanning 530004, China
Haibin He: Ningbo C.S.I. Power & Machinery Group Co., Ltd., Ningbo 315020, China

Energies, 2025, vol. 18, issue 14, 1-22

Abstract: This study investigates the impact of different combustion control strategies on marine engine combustion and emission characteristics at a high ammonia energy ratio. Compared to the strategy of maintaining a constant fuel injection duration, the strategy of keeping the fuel injection pressure constant allows the kinetic energy of diesel to remain at a higher level. This results in an increase in combustion efficiency and indicated the thermal efficiency of the engine, while also reducing CO 2 and soot emissions. However, when the ammonia energy ratio increases to more than 50%, the indicated thermal efficiency starts to decrease along with the increase in the emissions of N 2 O and unburned ammonia. To address these issues, one of the potential means is to improve the in-cylinder combustion environment by increasing the in-cylinder gas temperature. This can enhance combustion efficiency and ultimately optimize the performance and emission characteristics of dual-fuel engines, which results in an increase in the combustion efficiency to 98% and indicated thermal efficiency to 54.47% at a relatively high ammonia energy ratio of 60%. Emission results indicate that N 2 O emissions decrease from 1099 ppm to 25 ppm, while unburned ammonia emissions drop from 16016 ppm to 100 ppm. Eventually, the greenhouse gas emissions were reduced by about 85.3% in comparison with the baseline case.

Keywords: ammonia; dual-fuel; marine engine; combustion strategy; combustion and emission (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: 2025
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