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Thermodynamic optimization and comparative study of different ORC configurations utilizing the exergies of LNG and low grade heat of different temperatures

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  • Sun, Zhixin
  • Lai, Jianpeng
  • Wang, Shujia
  • Wang, Tielong

Abstract

ORC is a good solution to recover the cold exergy of LNG (liquefied natural gas) and the thermal exergy of low grade heat simultaneously. The optimal working fluids and parameters change greatly with different configurations and heat source temperatures. In this paper, three different ORC configurations: SORC (single-stage ORC), PTORC (parallel two-stage ORC) and CTORC (cascade two-stage ORC), combined with DEC (direct expansion cycle) are analyzed and compared. Up to seven key parameters of sixty four fluid combinations under four heat source temperatures are optimized by the particle swarm optimization. The results show that PTORC is more suitable for lower heat source temperatures and CTORC performs better for higher heat source temperatures. PTORC+DEC with ammonia/ethane as the fluid combination yields the maximum efficiency of 17.36% for the heat source temperature of 50 °C. CTORCs without DEC, also with ammonia/ethane as the fluid combination, achieve the maximum efficiencies of 19.49%, 21.69% and 24.37% for the heat source temperatures of 100, 150 and 200 °C, respectively. The optimal turbine inlet temperatures are usually their upper bounds and the optimal condensation temperatures are the normal boiling temperatures of the fluids. There are optimum evaporation temperatures for all configurations, which increase with the heat source temperature.

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  • 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.
    • Handle: RePEc:eee:energy:v:147:y:2018:i:c:p:688-700
    DOI: 10.1016/j.energy.2018.01.085
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    8. Choi, Hong Wone & Na, Sun-Ik & Hong, Sung Bin & Chung, Yoong & Kim, Dong Kyu & Kim, Min Soo, 2021. "Optimal design of organic Rankine cycle recovering LNG cold energy with finite heat exchanger size," Energy, Elsevier, vol. 217(C).
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    12. 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.
    13. She, Xiaohui & Zhang, Tongtong & Cong, Lin & Peng, Xiaodong & Li, Chuan & Luo, Yimo & Ding, Yulong, 2019. "Flexible integration of liquid air energy storage with liquefied natural gas regasification for power generation enhancement," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
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    16. 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).
    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. Joy, Jubil & Kochunni, Sarun Kumar & Chowdhury, Kanchan, 2022. "Size reduction and enhanced power generation in ORC by vaporizing LNG at high supercritical pressure irrespective of delivery pressure," Energy, Elsevier, vol. 260(C).
    19. Song, Chongzhi & Gu, Mingyan & Miao, Zheng & Liu, Chao & Xu, Jinliang, 2019. "Effect of fluid dryness and critical temperature on trans-critical organic Rankine cycle," Energy, Elsevier, vol. 174(C), pages 97-109.
    20. Behzadi, Amirmohammad & Gholamian, Ehsan & Houshfar, Ehsan & Habibollahzade, Ali, 2018. "Multi-objective optimization and exergoeconomic analysis of waste heat recovery from Tehran's waste-to-energy plant integrated with an ORC unit," Energy, Elsevier, vol. 160(C), pages 1055-1068.
    21. Xu, Jingyuan & Luo, Ercang & Hochgreb, Simone, 2021. "A thermoacoustic combined cooling, heating, and power (CCHP) system for waste heat and LNG cold energy recovery," Energy, Elsevier, vol. 227(C).

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