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Experimental Study on Mixed Combustion Characteristics of Methanol/Diesel Pool Fires in Engine Rooms of Hybrid Ships

Author

Listed:
  • Jiaqi Dong

    (School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China)

  • Zhongzheng Wu

    (Marine Design and Research Institute of China, Shanghai 200011, China)

  • Jinqi Han

    (School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China)

  • Jianghao Li

    (School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China)

  • Jiacheng Liu

    (School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China)

  • Yunfeng Yan

    (School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China)

  • Liang Wang

    (School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China)

Abstract

Methanol/diesel hybrid−powered vessels represent a significant advancement in green and low−carbon innovation in the maritime transportation sector and have been widely adopted across various shipping markets. However, the dual−fuel power system modifies the fire load within the engine room compared to traditional vessels, thereby significantly influencing the fire safety of methanol/diesel−powered ships. In this study, anhydrous methanol and light−duty diesel (with 0 °C pour point) were used as fuels to investigate the mixed combustion characteristics of these immiscible fuels in circular pools with diameters of 6, 10, 14, and 20 cm at various mixing ratios. By analyzing the fuel mass loss rate, flame morphology, and heat transfer characteristics, it was determined that methanol and diesel exhibited distinct stratification during combustion, with the process comprising three phases: pure methanol combustion phase, transitional combustion phase, and pure diesel combustion phase. Slopover occurred during the transitional combustion phase, and its intensity decreased as the pool diameter or methanol fuel quantity increased. Based on this conclusion, a quantitative relationship was established between slopover intensity, pool diameter, and the methanol/diesel volume ratio. Additionally, during the transitional combustion phase, the average flame height exhibited an exponential coupling relationship with the pool diameter and the methanol/diesel volume ratio. Therefore, a modification was made to the classical flame height model to account for these effects. Moreover, a prediction model for the burning rate of methanol/diesel pool fires was established based on transient temperature variations within the fuel layer. This model incorporated a correction factor related to pool diameter and fuel mixture ratio. Additionally, the causes of slopover were analyzed from the perspectives of heat transfer and fire dynamics, further refining the physical interpretation of the correction factor.

Suggested Citation

  • Jiaqi Dong & Zhongzheng Wu & Jinqi Han & Jianghao Li & Jiacheng Liu & Yunfeng Yan & Liang Wang, 2025. "Experimental Study on Mixed Combustion Characteristics of Methanol/Diesel Pool Fires in Engine Rooms of Hybrid Ships," Energies, MDPI, vol. 18(8), pages 1-33, April.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:8:p:1991-:d:1633579
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    References listed on IDEAS

    as
    1. Jinhu Liang & Anwen Wang & Yujia Feng & Xiaojie Li & Yi Hu & Shijun Dong & Yang Zhang & Fengqi Zhao, 2024. "An Experimental and Kinetic Modeling Study of the Laminar Burning Velocities of Ammonia/ n -Heptane Blends," Energies, MDPI, vol. 17(19), pages 1-11, September.
    2. Fangyuan Zheng & Haeng Muk Cho, 2024. "Exploring the Effects of Synergistic Combustion of Alcohols and Biodiesel on Combustion Performance and Emissions of Diesel Engines: A Review," Energies, MDPI, vol. 17(24), pages 1-23, December.
    3. Zhen, Xudong & Wang, Yang, 2015. "Numerical analysis on original emissions for a spark ignition methanol engine based on detailed chemical kinetics," Renewable Energy, Elsevier, vol. 81(C), pages 43-51.
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