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Exergy analysis of dual-stage nanofiltration seawater desalination

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  • Liu, Jie
  • Yuan, Junsheng
  • Xie, Lixin
  • Ji, Zhiyong

Abstract

Exergy analysis is a powerful tool for determining the efficiency of processes that influence system performance. Thus, the exergy of dual-stage NF (nanofiltration) seawater desalination was analyzed. Three different processes were simulated by Dow's Reverse Osmosis System Analysis, and the exergies were compared. The results indicated that the main exergy destruction in the conventional process occurred in the membrane and concentration stream valves. To reduce the exergy and energy consumption, concentration blending and an energy recovery device were applied in the improved process, which reduced the specific energy consumption and enhanced the exergetic efficiency and recovery ratio. The calculated specific energy consumption was reduced to 2.09 kWh/m3, and the system recovery ratio was increased to reach 42.78% under the condition specified in this paper. Thus, the development of a novel energy-saving membrane module and an energy recovery device is important in reducing energy consumption in dual-stage NF seawater desalination.

Suggested Citation

  • Liu, Jie & Yuan, Junsheng & Xie, Lixin & Ji, Zhiyong, 2013. "Exergy analysis of dual-stage nanofiltration seawater desalination," Energy, Elsevier, vol. 62(C), pages 248-254.
    • Handle: RePEc:eee:energy:v:62:y:2013:i:c:p:248-254
    DOI: 10.1016/j.energy.2013.07.071
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    References listed on IDEAS

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    1. Sharqawy, Mostafa H. & Zubair, Syed M. & Lienhard, John H., 2011. "Second law analysis of reverse osmosis desalination plants: An alternative design using pressure retarded osmosis," Energy, Elsevier, vol. 36(11), pages 6617-6626.
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    1. Blanco-Marigorta, A.M. & Lozano-Medina, A. & Marcos, J.D., 2017. "A critical review of definitions for exergetic efficiency in reverse osmosis desalination plants," Energy, Elsevier, vol. 137(C), pages 752-760.
    2. Ghasemi, Mostafa & Wan Daud, Wan Ramli & Alam, Javed & Ilbeygi, Hamid & Sedighi, Mehdi & Ismail, Ahmad Fauzi & Yazdi, Mohammad H. & Aljlil, Saad A., 2016. "Treatment of two different water resources in desalination and microbial fuel cell processes by poly sulfone/Sulfonated poly ether ether ketone hybrid membrane," Energy, Elsevier, vol. 96(C), pages 303-313.
    3. Ali, Aamer & Tufa, Ramato Ashu & Macedonio, Francesca & Curcio, Efrem & Drioli, Enrico, 2018. "Membrane technology in renewable-energy-driven desalination," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 1-21.
    4. Usón, Sergio & Uche, Javier & Martínez, Amaya & del Amo, Alejandro & Acevedo, Luis & Bayod, Ángel, 2019. "Exergy assessment and exergy cost analysis of a renewable-based and hybrid trigeneration scheme for domestic water and energy supply," Energy, Elsevier, vol. 168(C), pages 662-683.
    5. Sagar Roy & Smruti Ragunath, 2018. "Emerging Membrane Technologies for Water and Energy Sustainability: Future Prospects, Constraints and Challenges," Energies, MDPI, vol. 11(11), pages 1-32, November.

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