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Improving a process's efficiency by exploiting heat pockets in its heat exchange network

Author

Listed:
  • Wang, Yufei
  • Feng, Xiao
  • Cai, Yan
  • Zhu, Maobin
  • Chu, Khim H.

Abstract

On the grand composite curve of a heat exchange network, a heat pocket exists when a local heat source above the pinch point or a local heat sink below the pinch point appears. In this paper, heat recovery in the heat pocket is presented by combining the pinch technology and exergy analysis. When the heat pocket is big, hot streams in the pocket can be used to generate a higher level utility, and the cold streams in the pocket can be heated by a lower level utility. In this way, exergy loss can be reduced, and the process's efficiency can be improved. The heat exchange network of a hydrogen production process is used as a case study. The energy performance of the heat exchange network can be further improved by recovering the heat in the heat pocket, compared with the scheme based only on pinch technology.

Suggested Citation

  • Wang, Yufei & Feng, Xiao & Cai, Yan & Zhu, Maobin & Chu, Khim H., 2009. "Improving a process's efficiency by exploiting heat pockets in its heat exchange network," Energy, Elsevier, vol. 34(11), pages 1925-1932.
    • Handle: RePEc:eee:energy:v:34:y:2009:i:11:p:1925-1932
    DOI: 10.1016/j.energy.2009.08.010
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    References listed on IDEAS

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    Cited by:

    1. Gu, Wugen & Huang, Yuqing & Wang, Kan & Zhang, Bingjian & Chen, Qinglin & Hui, Chi-Wai, 2014. "Comparative analysis and evaluation of three crude oil vacuum distillation processes for process selection," Energy, Elsevier, vol. 76(C), pages 559-571.
    2. Liew, Peng Yen & Theo, Wai Lip & Wan Alwi, Sharifah Rafidah & Lim, Jeng Shiun & Abdul Manan, Zainuddin & Klemeš, Jiří Jaromír & Varbanov, Petar Sabev, 2017. "Total Site Heat Integration planning and design for industrial, urban and renewable systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 68(P2), pages 964-985.
    3. Du, S. & Wang, R.Z. & Xia, Z.Z., 2014. "Optimal ammonia water absorption refrigeration cycle with maximum internal heat recovery derived from pinch technology," Energy, Elsevier, vol. 68(C), pages 862-869.
    4. Huang, Kefeng & Karimi, I.A., 2016. "Work-heat exchanger network synthesis (WHENS)," Energy, Elsevier, vol. 113(C), pages 1006-1017.
    5. Soltani, Hadi & Shafiei, Sirous, 2011. "Heat exchanger networks retrofit with considering pressure drop by coupling genetic algorithm with LP (linear programming) and ILP (integer linear programming) methods," Energy, Elsevier, vol. 36(5), pages 2381-2391.
    6. Pan, Ming & Smith, Robin & Bulatov, Igor, 2013. "A novel optimization approach of improving energy recovery in retrofitting heat exchanger network with exchanger details," Energy, Elsevier, vol. 57(C), pages 188-200.
    7. Xia, Hui & Ye, Qing & Feng, Shenyao & Li, Rui & Suo, Xiaomeng, 2017. "A novel energy-saving pressure swing distillation process based on self-heat recuperation technology," Energy, Elsevier, vol. 141(C), pages 770-781.

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