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Graphical pinch analysis-based method for heat exchanger networks retrofit of a residuum hydrogenation process

Author

Listed:
  • Zhi, Keke
  • Wang, Bohong
  • Guo, Lianghui
  • Chen, Yujie
  • Li, Wei
  • Ocłoń, Paweł
  • Wang, Jin
  • Chen, Yuping
  • Tao, Hengcong
  • Li, Xinze
  • Varbanov, Petar Sabev

Abstract

Sustainable energy systems are crucial for reducing carbon emissions because renewable energy sources leave a footprint. The petrochemical industry often suffers from inefficient heat exchange network (HEN) systems, leading to substantial energy wastage. In the current work, a real case study of the residue hydrogenation process was analyzed to identify potential energy savings. A new method combining Pinch Analysis and Thot–Tcold diagram analysis methods was proposed. This graphical analysis method plots the cold-flow temperature of each heat exchanger unit on the x-axis and the hot-flow temperature on the y-axis. By applying the Thot–Tcold diagram to a practical case of residue hydrogenation in Zhejiang, the existing process energy state was evaluated, and HEN was retrofitted to achieve energy savings and carbon emission reduction. Following optimization, the energy recovery amounted to 202.71 GJ/h with an energy recovery rate of 14.3 %. The proposed method saves approximately 4.058 × 105 GJ/y compared to current operations, resulting in an annual cost saving of approximately $ 2.76 M/y, with an investment payback period of less than 0.36 y. This study offers a solution to the energy challenges of industrial residue hydrogenation by enhancing the economic and environmental sustainability of existing process flows.

Suggested Citation

  • Zhi, Keke & Wang, Bohong & Guo, Lianghui & Chen, Yujie & Li, Wei & Ocłoń, Paweł & Wang, Jin & Chen, Yuping & Tao, Hengcong & Li, Xinze & Varbanov, Petar Sabev, 2024. "Graphical pinch analysis-based method for heat exchanger networks retrofit of a residuum hydrogenation process," Energy, Elsevier, vol. 299(C).
    • Handle: RePEc:eee:energy:v:299:y:2024:i:c:s0360544224013112
    DOI: 10.1016/j.energy.2024.131538
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    References listed on IDEAS

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