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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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    10. Shamsi, Mohammad & Rooeentan, Saeed & karami, Behtash & Elyasi Gomari, Kamal & Naseri, Masoud & Bonyadi, Mohammad, 2023. "Design and thermodynamic analysis of a novel structure utilizing coke oven gas for LNG and power cogeneration," Energy, Elsevier, vol. 277(C).
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    12. Kang, Goanwoo & Im, Junyoung & Lee, Chul-Jin, 2024. "Operational strategy to minimize operating cost in LNG terminal using a comprehensive numerical boil-off gas model," Energy, Elsevier, vol. 296(C).
    13. Xue, Feier & Chen, Yu & Ju, Yonglin, 2017. "Design and optimization of a novel cryogenic Rankine power generation system employing binary and ternary mixtures as working fluids based on the cold exergy utilization of liquefied natural gas (LNG)," Energy, Elsevier, vol. 138(C), pages 706-720.
    14. Zheng, Siyang & Li, Chenghao & Zeng, Zhiyong, 2022. "Thermo-economic analysis, working fluids selection, and cost projection of a precooler-integrated dual-stage combined cycle (PIDSCC) system utilizing cold exergy of liquefied natural gas," Energy, Elsevier, vol. 238(PC).
    15. Li, Jing & Alvi, Jahan Zeb & Pei, Gang & Su, Yuehong & Li, Pengcheng & Gao, Guangtao & Ji, Jie, 2016. "Modelling of organic Rankine cycle efficiency with respect to the equivalent hot side temperature," Energy, Elsevier, vol. 115(P1), pages 668-683.
    16. Kaczmarczyk, Tomasz Z. & Żywica, Grzegorz & Ihnatowicz, Eugeniusz, 2017. "The impact of changes in the geometry of a radial microturbine stage on the efficiency of the micro CHP plant based on ORC," Energy, Elsevier, vol. 137(C), pages 530-543.
    17. Badami, Marco & Bruno, Juan Carlos & Coronas, Alberto & Fambri, Gabriele, 2018. "Analysis of different combined cycles and working fluids for LNG exergy recovery during regasification," Energy, Elsevier, vol. 159(C), pages 373-384.
    18. 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).
    19. Liu, Yang & Han, Jitian & You, Huailiang, 2020. "Exergoeconomic analysis and multi-objective optimization of a CCHP system based on LNG cold energy utilization and flue gas waste heat recovery with CO2 capture," Energy, Elsevier, vol. 190(C).
    20. Fahmy, M.F.M. & Nabih, H.I. & El-Rasoul, T.A., 2015. "Optimization and comparative analysis of LNG regasification processes," Energy, Elsevier, vol. 91(C), pages 371-385.

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