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A novel propane pre-cooled mixed refrigerant process for coproduction of LNG and high purity ethane

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  • He, Ting
  • Lin, Wensheng

Abstract

For high ethane-containing natural gas, such as shale gas, separation and purification of ethane during liquefaction can improve economic benefits. A novel process of propane pre-cooled mixed refrigerant natural gas liquefaction integrated with cryogenic distillation for ethane separation is introduced and analyzed, which produce both liquefied natural gas (LNG) and liquefied ethane at the same time. The chemical engineering software HYSYS is used to simulate the process, and the liquefaction operation parameters of the system are optimized by genetic algorithm to reduce energy consumption. The results show that the proposed process can effectively achieve ethane separation, with the purity of ethane product over 99.5% and ethane recovery rate higher than 99.5%. As the ethane content in the feed gas increases, the specific power consumption and exergy efficiency of the system decrease slightly. When ethane content is in the range of 10%–40%, the optimized specific energy consumption is around 0.44 kWh/Nm3(natural gas), and the exergy efficiency is around 47%.

Suggested Citation

  • He, Ting & Lin, Wensheng, 2020. "A novel propane pre-cooled mixed refrigerant process for coproduction of LNG and high purity ethane," Energy, Elsevier, vol. 202(C).
    • Handle: RePEc:eee:energy:v:202:y:2020:i:c:s0360544220308914
    DOI: 10.1016/j.energy.2020.117784
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    References listed on IDEAS

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    Cited by:

    1. He, Ting & Si, Bin & Gundersen, Truls & Chen, Liqiong & Lin, Wensheng, 2024. "Integrated ethane recovery and cryogenic carbon capture in a dual mixed refrigerant natural gas liquefaction process," Energy, Elsevier, vol. 290(C).
    2. Jinxi, Wang & Xue, Bai & Ying, Liang & Aimin, Wang & Cuiying, Lu & Yajun, Ma & Chengmeng, Chen & Heydarian, Dariush, 2023. "Simulation and technical, economic, and environmental analyses of natural gas liquefaction cycle using different configurations," Energy, Elsevier, vol. 278(C).
    3. Uwitonze, Hosanna & Chaniago, Yus Donald & Lim, Hankwon, 2022. "Novel integrated energy-efficient dual-effect single mixed refrigerant and NGLs recovery process for small-scale natural gas processing plant," Energy, Elsevier, vol. 254(PA).
    4. Zhang, Qiang & Zhang, Ningqi & Zhu, Shengbo & Heydarian, Dariush, 2023. "Thermodynamic simulation and optimization of natural gas liquefaction cycle based on the common structure of organic rankine cycle," Energy, Elsevier, vol. 264(C).
    5. Zhang, Shouxin & Zou, Zimo & Klemeš, Jiří Jaromír & Varbanov, Petar Sabev & Shahzad, Khurram & Ali, Arshid Mahmood & Wang, Bo-Hong, 2023. "A new strategy for mixed refrigerant composition optimisation in the propane precooled mixed refrigerant natural gas liquefaction process," Energy, Elsevier, vol. 274(C).
    6. Jin, Chunhe & Yuan, Yilong & Son, Heechang & Lim, Youngsub, 2022. "Novel propane-free mixed refrigerant integrated with nitrogen expansion natural gas liquefaction process for offshore units," Energy, Elsevier, vol. 238(PA).
    7. Almeida-Trasvina, Fernando & Smith, Robin, 2023. "Design and optimisation of novel cascade mixed refrigerant cycles for LNG production – Part II: Novel cascade configurations," Energy, Elsevier, vol. 266(C).
    8. Shazed, Abdur Rahman & Ashraf, Hafsa M. & Katebah, Mary A. & Bouabidi, Zineb & Al-musleh, Easa I., 2021. "Overcoming the energy and environmental issues of LNG plants by using solid oxide fuel cells," Energy, Elsevier, vol. 218(C).

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