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LNG-FSRU cold energy recovery regasification using a zeotropic mixture of ethane and propane

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  • Yoonho, Lee

Abstract

This study developed a cold energy recovery regasification system for recovering and utilizing waste cold energy from liquefied natural gas floating storage regasification units, and analyzed its thermal, exergy, and economic efficiencies using a zeotropic mixture of ethane and propane. The single-stage version exhibited the highest net output, thermal efficiency, and exergy efficiency for a 6:4 ethane/propane mixture. The existing method (using only propane as working fluid) exhibited a thermal efficiency of 3.5%, exergy efficiency of 5.9% at 25 °C, and thermal efficiency of 3.8%. The exergy efficiency was 6.2% because the exergy loss was reduced by 300 MJ/h compared to that for the conventional method. The highest thermal and exergy efficiencies (6.1% and 10.9%) in the two-stage version were obtained for an 8:2 ethane/propane mixture. The thermal efficiency was 6.6% and exergy loss was 16,300 MJ/h compared to the existing method, showing a 10.9% improvement. Thermal and exergy efficiencies of the two-stage version were higher than those for the one-stage system by 2.7% and 4.7%, respectively, providing an annual net income of USD 3.60 million and reduced electricity production costs by 0.0021 USD/kWh. The system could reduce exergy loss and electricity production costs while increasing the annual net income.

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  • Yoonho, Lee, 2019. "LNG-FSRU cold energy recovery regasification using a zeotropic mixture of ethane and propane," Energy, Elsevier, vol. 173(C), pages 857-869.
    • Handle: RePEc:eee:energy:v:173:y:2019:i:c:p:857-869
    DOI: 10.1016/j.energy.2019.02.111
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    Cited by:

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    2. Wu, Wencong & Xie, Shutao & Tan, Jiaqi & Ouyang, Tiancheng, 2022. "An integrated design of LNG cold energy recovery for supply demand balance using energy storage devices," Renewable Energy, Elsevier, vol. 183(C), pages 830-848.
    3. Xu, Weicong & Zhao, Ruikai & Deng, Shuai & Zhao, Li & Mao, Samuel S., 2021. "Is zeotropic working fluid a promising option for organic Rankine cycle: A quantitative evaluation based on literature data," Renewable and Sustainable Energy Reviews, Elsevier, vol. 148(C).
    4. Christos Papaleonidas & Emmanouil Androulakis & Dimitrios V. Lyridis, 2020. "A Simulation-Based Planning Tool for Floating Storage and Regasification Units," Logistics, MDPI, vol. 4(4), pages 1-16, November.

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