Emission reduction in DI-DAI mode: Research on control strategy of diesel/ammonia dual fuel engine

Deng Hu, Hechun Wang, Chuanlei Yang, Xiaoxiao Niu, Hongyu Mu, Yinyan Wang and Xingtian Zhao

Energy, 2025, vol. 334, issue C

Abstract: The inherent high gasification latent heat and sluggish flame propagation speed characteristics of ammonia fuel lead to combustion instability and increased difficulty in emission control during the combustion process of diesel-ignited ammonia engine. This paper aims to adjust the different injection timing of diesel/ammonia to determine the best stratified combustion control strategy under direct injection-directed ammonia injection mode (DI-DAI). In this paper, based on the combustion characteristics of ammonia fuel, a total of 35 diesel/ammonia injection combinations from 690oCA to 705oCA were set up. The simulation results show that the change of injection timing plays a decisive role in the effect of diesel/ammonia stratified combustion in cylinder. Under rated conditions, all injection strategies meet Tier-II emission standards and can achieve near-zero carbon emissions. Compared to D690/A690, the NOx emissions in the D705/A713combination are reduced by 75.83 %. But, the ammonia escape ratio in the D705/A713 combination reaches 34.40 %. Compared to the D705/A713 combination, the D693/A697 combination exhibited a 90.4 % reduction in N2O emissions and a 76.8 % reduction in NO2. Finally, the D693/A697 combination was selected as the best combustion control combination.

Keywords: Direct injection-directed ammonia injection; Diesel/ammonia dual fuel engine; Double injection strategy; Combustion and emission performance (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:334:y:2025:i:c:s0360544225032694

DOI: 10.1016/j.energy.2025.137627

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