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Cascade refrigeration systems in integrated cryogenic natural gas process (natural gas liquids (NGL), liquefied natural gas (LNG) and nitrogen rejection unit (NRU))

Author

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  • Ghorbani, Bahram
  • Hamedi, Mohammad-Hossein
  • Amidpour, Majid
  • Mehrpooya, Mehdi

Abstract

Heavy components in the natural gas itself can feed downstream units and also due to the low temperature process may be formed solid. Therefore heavy components separation is a necessity and can produce useful products. Virtually all natural gases are containing nitrogen that would lower the heating value of natural gas. This study investigates design and optimization of integrated process recovery of natural gas liquids, natural gas liquefaction, and nitrogen remove unit. In this integrated process, design of low temperature processes is started from the core process and continued by heat exchangers network design and cooling system based on MFC. Design and integration processes of units at the same time reduces the number of required equipment and energy consumption. The results show that the new integrated process has specific power around 0.343–0.33 (kW-h/kg-LNG) and its thermal efficiency equal to 62.82%, compared to other integrated systems have the lowest and highest values. Exergy analysis shows that towers has the highest Exergy destruction among other equipment. Sensitivity analysis shows that the structure of the integrated process capable of removing nitrogen from natural gas at a concentration of between 5% and 15%. By analyzing the operating parameters shows reduction in the Total specific power from 19.5% to 24% and the Specific power from 2.57% to 11%, yet surging in the Ethane recovery from 2.5% to 17%. Sensitivity analysis is the method to identification of the Decision variables, finally Genetic Algorithm used to identify optimum of objective function (minimization of Specific Power) and reduction of it to 6%.

Suggested Citation

  • Ghorbani, Bahram & Hamedi, Mohammad-Hossein & Amidpour, Majid & Mehrpooya, Mehdi, 2016. "Cascade refrigeration systems in integrated cryogenic natural gas process (natural gas liquids (NGL), liquefied natural gas (LNG) and nitrogen rejection unit (NRU))," Energy, Elsevier, vol. 115(P1), pages 88-106.
    • Handle: RePEc:eee:energy:v:115:y:2016:i:p1:p:88-106
    DOI: 10.1016/j.energy.2016.09.005
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    References listed on IDEAS

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    10. Qyyum, Muhammad Abdul & Lee, Moonyong, 2018. "Hydrofluoroolefin-based novel mixed refrigerant for energy efficient and ecological LNG production," Energy, Elsevier, vol. 157(C), pages 483-492.
    11. Khaliq Majeed & Muhammad Abdul Qyyum & Alam Nawaz & Ashfaq Ahmad & Muhammad Naqvi & Tianbiao He & Moonyong Lee, 2020. "Shuffled Complex Evolution-Based Performance Enhancement and Analysis of Cascade Liquefaction Process for Large-Scale LNG Production," Energies, MDPI, vol. 13(10), pages 1-20, May.
    12. Kim, Donghoi & Gundersen, Truls, 2020. "Use of exergy efficiency for the optimization of LNG processes with NGL extraction," Energy, Elsevier, vol. 197(C).
    13. Yang, Sheng & Wen, Jiakang & Liu, Zhiqiang & Deng, Chengwei & Xie, Nan, 2024. "3E analyses and multi-objective optimization of a liquid nitrogen wash based cogeneration system for electrical power and LNG production," Energy, Elsevier, vol. 297(C).
    14. Wang, Xin & Xu, Jingyuan & Wu, Zhanghua & Luo, Ercang, 2022. "A thermoacoustic refrigerator with multiple-bypass expansion cooling configuration for natural gas liquefaction," Applied Energy, Elsevier, vol. 313(C).
    15. Liang, Jierong & Sun, Li & Li, Tingxun, 2018. "A novel defrosting method in gasoline vapor recovery application," Energy, Elsevier, vol. 163(C), pages 751-765.
    16. Song, Rui & Cui, Mengmeng & Liu, Jianjun, 2017. "Single and multiple objective optimization of a natural gas liquefaction process," Energy, Elsevier, vol. 124(C), pages 19-28.
    17. Lei Gao & Jiaxin Wang & Maxime Binama & Qian Li & Weihua Cai, 2022. "The Design and Optimization of Natural Gas Liquefaction Processes: A Review," Energies, MDPI, vol. 15(21), pages 1-56, October.
    18. Xu, Jingyuan & Hu, Jianying & Sun, Yanlei & Wang, Huizhi & Wu, Zhanghua & Hu, Jiangfeng & Hochgreb, Simone & Luo, Ercang, 2020. "A cascade-looped thermoacoustic driven cryocooler with different-diameter resonance tubes. Part Ⅱ: Experimental study and comparison," Energy, Elsevier, vol. 207(C).
    19. Qyyum, Muhammad Abdul & Qadeer, Kinza & Minh, Le Quang & Haider, Junaid & Lee, Moonyong, 2019. "Nitrogen self-recuperation expansion-based process for offshore coproduction of liquefied natural gas, liquefied petroleum gas, and pentane plus," Applied Energy, Elsevier, vol. 235(C), pages 247-257.
    20. Cao, Yan & Mohammadian, Mehrnoush & Pirouzfar, Vahid & Su, Chia-Hung & Khan, Afrasyab, 2021. "Break Even Point analysis of liquefied natural gas process and optimization of its refrigeration cycles with technical and economic considerations," Energy, Elsevier, vol. 237(C).
    21. Ancona, M.A. & Bianchi, M. & Branchini, L. & De Pascale, A. & Melino, F. & Mormile, M. & Palella, M. & Scarponi, L.B., 2018. "Investigation on small-scale low pressure LNG production process," Applied Energy, Elsevier, vol. 227(C), pages 672-685.

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