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Thermodynamic analysis and optimization of a two-stage organic Rankine cycle for liquefied natural gas cryogenic exergy recovery

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  • Xue, Xiaodi
  • Guo, Cong
  • Du, Xiaoze
  • Yang, Lijun
  • Yang, Yongping

Abstract

A two-stage ORC (organic Rankine cycle) is proposed, by which low-grade heat of exhaust flue gas of a 123.5 MW gas-steam combined cycle power generating unit, as well as the cryogenic energy of LNG (liquefied natural gas) can be effectively recovered and utilized. R227ea and R116 are selected as working fluids for the system. Based on the thermodynamic mathematical models, the effects of key design parameters, including that of turbine inlet pressures, mass flow rates of working fluids and outlet steam fractions of evaporators on the system performance are investigated from the view of both thermodynamics and economics with CPP (cost per net power output) as the objective function. The results obtained the optimal inlet pressure of turbines, under which, the CPP has the minimum value. It is found that the CPP also decreases with the mass flow rate of R227ea and R116. The rate of absorbed heat in top cycle to that in bottom cycle has a positive impact on CPP, but very weak. The optimized two-stage ORC system can output net work with 1776.44 kW with the thermal efficiency of 25.64% and exergy efficiency of 31.02%. Cost per net power output is 6.3$/W, while the LNG temperature can be raised to 283.15 K.

Suggested Citation

  • Xue, Xiaodi & Guo, Cong & Du, Xiaoze & Yang, Lijun & Yang, Yongping, 2015. "Thermodynamic analysis and optimization of a two-stage organic Rankine cycle for liquefied natural gas cryogenic exergy recovery," Energy, Elsevier, vol. 83(C), pages 778-787.
    • Handle: RePEc:eee:energy:v:83:y:2015:i:c:p:778-787
    DOI: 10.1016/j.energy.2015.02.088
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    9. Domingues, António & Matos, Henrique A. & Pereira, Pedro M., 2022. "Novel integrated system of LNG regasification / electricity generation based on a cascaded two-stage Rankine cycle, with ternary mixtures as working fluids and seawater as hot utility," Energy, Elsevier, vol. 238(PC).
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    12. Han, Hui & Wang, Zihua & Wang, Cheng & Deng, Gonglin & Song, Chao & Jiang, Jie & Wang, Shaowei, 2019. "The study of a novel two-stage combined rankine cycle utilizing cold energy of liquefied natural gas," Energy, Elsevier, vol. 189(C).
    13. Sun, Zhixin & Lai, Jianpeng & Wang, Shujia & Wang, Tielong, 2018. "Thermodynamic optimization and comparative study of different ORC configurations utilizing the exergies of LNG and low grade heat of different temperatures," Energy, Elsevier, vol. 147(C), pages 688-700.
    14. Özen, Dilek Nur & Koçak, Betül, 2022. "Advanced exergy and exergo-economic analyses of a novel combined power system using the cold energy of liquefied natural gas," Energy, Elsevier, vol. 248(C).
    15. Tian, Zhen & Qi, Zhixin & Gan, Wanlong & Tian, Molin & Gao, Wenzhong, 2022. "A novel negative carbon-emission, cooling, and power generation system based on combined LNG regasification and waste heat recovery: Energy, exergy, economic, environmental (4E) evaluations," Energy, Elsevier, vol. 257(C).
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    17. Aryanfar, Yashar & Mohtaram, Soheil & García Alcaraz, Jorge Luis & Sun, HongGuang, 2023. "Energy and exergy assessment and a competitive study of a two-stage ORC for recovering SFGC waste heat and LNG cold energy," Energy, Elsevier, vol. 264(C).
    18. 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.
    19. Lee, Sangick, 2017. "Multi-parameter optimization of cold energy recovery in cascade Rankine cycle for LNG regasification using genetic algorithm," Energy, Elsevier, vol. 118(C), pages 776-782.

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