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Effects of hydrogen volume fraction, air fuel ratio, and compression ratio on combustion and emission characteristics of an SI ammonia-hydrogen engine

Author

Listed:
  • Liang, Yuwei
  • Wang, Zhongjun
  • Dong, Dongsheng
  • Wei, Wenwen
  • Zhang, Hanyuyang
  • Li, Gesheng
  • Zhang, Zunhua

Abstract

An effective approach to reducing greenhouse gas emissions is to utilize low/zero carbon fuels. This study simulated the combustion of a marine spark ignition (SI) ammonia-hydrogen engine, focusing on the effects of hydrogen volume fraction (XH2), air fuel ratio (λ), and compression ratio (CR) on the combustion and emission characteristics. The pathways of nitrogen-based pollutants such as NH3, NO, and N2O were explained. The results show that increasing XH2 improves Pmax, heat release rate, thermal efficiency, and power. Regarding emission characteristics, when XH2 rises, NH3 emissions drop; NOx emissions remain almost constant at λ ≤ 1 (2100 ppm at λ = 1) and considerably increase at λ > 1, peaking at 5245 ppm. Moreover, as CR rises, the engine power and thermal efficiency increase, NOx emissions decrease by 10%, and N2O emissions are below 20 ppm. Furthermore, chemical kinetic analysis shows that NO comes from N and N2, diffuses from the flame front toward the center in the cylinder under λ = 1.2. And NO comes from HNO and is generated in the flame front and the center under λ = 0.9, respectively. N2O is produced by NH and NH2 and is only generated in the flame front.

Suggested Citation

  • Liang, Yuwei & Wang, Zhongjun & Dong, Dongsheng & Wei, Wenwen & Zhang, Hanyuyang & Li, Gesheng & Zhang, Zunhua, 2024. "Effects of hydrogen volume fraction, air fuel ratio, and compression ratio on combustion and emission characteristics of an SI ammonia-hydrogen engine," Energy, Elsevier, vol. 308(C).
    • Handle: RePEc:eee:energy:v:308:y:2024:i:c:s036054422402632x
    DOI: 10.1016/j.energy.2024.132858
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    References listed on IDEAS

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    1. Zhu, Jizhen & Zhou, Dezhi & Yang, Wenming & Qian, Yong & Mao, Yebing & Lu, Xingcai, 2023. "Investigation on the potential of using carbon-free ammonia in large two-stroke marine engines by dual-fuel combustion strategy," Energy, Elsevier, vol. 263(PB).
    2. Wei, Wenwen & Li, Gesheng & Zhang, Zunhua & Long, Yanxiang & Zhang, Hanyuyang & Huang, Yong & Zhou, Mengni & Wei, Yi, 2023. "Effects of ammonia addition on the performance and emissions for a spark-ignition marine natural gas engine," Energy, Elsevier, vol. 272(C).
    3. Voglar, J. & Teržan, J. & Kroflič, A. & Huš, M. & Likozar, B., 2023. "Mechanistic modelling of catalytic NOX reduction reactions after hydrogen or ammonia combustion on multiple scales," Renewable and Sustainable Energy Reviews, Elsevier, vol. 186(C).
    4. Li, Jun & Huang, Hongyu & Kobayashi, Noriyuki & Wang, Chenguang & Yuan, Haoran, 2017. "Numerical study on laminar burning velocity and ignition delay time of ammonia flame with hydrogen addition," Energy, Elsevier, vol. 126(C), pages 796-809.
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    1. Diming Lou & Yixuan Liu & Yunhua Zhang, 2025. "Influence of Compression Ratio on Combustion and Emission Characteristics of Hydrogen Internal Combustion Engines Under Different Excess Air Coefficients," Energies, MDPI, vol. 18(7), pages 1-19, March.

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