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Green and Efficient Recovery and Optimization of Waste Heat and LNG Cold Energy in LNG-Powered Ship Engines

Author

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  • Xinglin Yang

    (School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China)

  • Qiang Lei

    (School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China)

  • Junhu Zou

    (School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China)

  • Xiaohui Lu

    (School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China)

  • Zhenzhen Chen

    (School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China)

Abstract

This study focuses on the Wartsila 9L34DF engine and proposes an integrated system for low-temperature carbon capture using the coupling of cold and hot energy recovery with membrane separation in LNG-powered ships. By utilizing a series dual-pressure organic Rankine cycle (SDPORC) system to recover waste heat from the engine exhaust gases and generate electricity, the system provides power support for the low-temperature carbon capture compression process without consuming additional ship power. To validate the accuracy and reliability of the mathematical model, the simulation results are compared with the literature’s data. Once the model’s accuracy is ensured, the operational parameters of the integrated system are analyzed. Subsequently, working fluid optimization and genetic algorithm sensitive parameter optimization are conducted. Finally, under the optimal operating conditions, the thermodynamic performance and economic evaluation of the integrated system are assessed. The results demonstrate that the net power output of the integrated system is 100.95 kW, with an exergy efficiency of 45.19%. The unit carbon capture cost (UCC) is 14.24 $/ton, and for each unit of consumed LNG, 1.97 kg of liquid CO 2 with a concentration of 99.5% can be captured. This integrated system significantly improves the energy utilization efficiency of ships and reduces CO 2 emissions.

Suggested Citation

  • Xinglin Yang & Qiang Lei & Junhu Zou & Xiaohui Lu & Zhenzhen Chen, 2023. "Green and Efficient Recovery and Optimization of Waste Heat and LNG Cold Energy in LNG-Powered Ship Engines," Energies, MDPI, vol. 16(24), pages 1-32, December.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:24:p:7957-:d:1296063
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    References listed on IDEAS

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