Effects of Pre-Injection Strategy on Combustion Characteristics of Ammonia/Diesel Dual-Fuel Compression Ignition Mode

Lianmei Guo, Jianjun Zhu (), Laibin Fu, Zhixin Li, Fanfan Liu, Zilin Wang, Xiangyang Liu and Qinqiang Dong
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Lianmei Guo: College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Jianjun Zhu: College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Laibin Fu: College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Zhixin Li: College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Fanfan Liu: College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Zilin Wang: College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Xiangyang Liu: College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Qinqiang Dong: College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Energies, 2023, vol. 16, issue 23, 1-16

Abstract: As a zero-carbon clean fuel, the use of ammonia in internal combustion engines is of great significance to achieve the “two-carbon” goal. This paper investigates the effect of the ammonia energy ratio and diesel injection timing on combustion and emissions. Based on Computational fluid dynamics (CFD) and the simulation analysis software, Converge, three-dimensional modeling is carried out for a direct injection diesel engine with a Compression Ignition (CI) mode. Under the initial full-load conditions of 1200 r/min, the engine simulation was calculated. The results show that the peak cylinder pressure increases and then decreases as the ammonia energy ratio increases, the ignition delay time increases, and the CO 2 and N 2 O emissions decrease. With pre-injection, the peak cylinder pressure increases at the same energy ratio and the combustion stage advances, resulting in improved indicated thermal efficiency. In comparison to the pure diesel mode, the pre-injection strategy shows an obvious reduction in greenhouse gas (GHG) emissions with a decrease of 40.9% by adjusting the injection timing, while the single injection strategy shows a reduction of 36.5%. The soot emission peak occurs in the diesel-only mode with 98.13% and 99.6% reductions in emissions under single and pre-injection, respectively. The ammonia–diesel dual-fuel (ADDF) engine with an ammonia-to-energy ratio of 70% and optimized ammonia and diesel injection timing significantly reduces the NH 3 emissions and GHG emissions by 69.34%.

Keywords: ammonia–diesel dual fuel; ammonia energy ratio; pre-injection strategy; GHG 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: 2023
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