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Improved energy recovery from the condensed steam as part of HEN retrofit

Author

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  • Markowski, Mariusz
  • Urbaniec, Krzysztof
  • Suchecki, Witold
  • Storczyk, Sandra

Abstract

The conventional approach to heat exchanger network (HEN) retrofit involving design techniques based on Pinch Technology (PT) is extended to include minimization of energy losses resulting from steam-condensate expansion. The authors proposed a new approach to minimize energy losses in utility system, thermally coupled with the combined heat and power (CHP) plant, using condensate subcooling phenomena. Moreover, applying condensate subcooling can counteract the drawbacks of commonly used multi-stage condensate expansion which increase operability and reduces investment and maintenance costs. A case study illustrates the suitability of improved condensate management as a HEN retrofit measure. The study object is a Methyl-Tert-Butyl Ether (MTBE) plant processing 18 t/h isobutylene and consuming 4386 kW of hot utility (steam) in the HEN. A study of the maximum possible heat recovery using PT indicates that the combined heat recovery from hot process streams and condensate can be increased by 510 kW compared to the existing state. At the same time, it is possible to generate additional power of 120 kW in the CHP plant that supplies energy to the MTBE plant. The locations of heat exchangers are accounted for in HEN reconfiguring. A new scheme of steam and condensate system is presented.

Suggested Citation

  • Markowski, Mariusz & Urbaniec, Krzysztof & Suchecki, Witold & Storczyk, Sandra, 2023. "Improved energy recovery from the condensed steam as part of HEN retrofit," Energy, Elsevier, vol. 270(C).
    • Handle: RePEc:eee:energy:v:270:y:2023:i:c:s0360544223001214
    DOI: 10.1016/j.energy.2023.126727
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    References listed on IDEAS

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    1. Christian Langner & Elin Svensson & Simon Harvey, 2020. "A Framework for Flexible and Cost-Efficient Retrofit Measures of Heat Exchanger Networks," Energies, MDPI, vol. 13(6), pages 1-24, March.
    2. Wang, Bohong & Klemeš, Jiří Jaromír & Varbanov, Petar Sabev & Chin, Hon Huin & Wang, Qiu-Wang & Zeng, Min, 2020. "Heat exchanger network retrofit by a shifted retrofit thermodynamic grid diagram-based model and a two-stage approach," Energy, Elsevier, vol. 198(C).
    3. Chin, Hon Huin & Wang, Bohong & Varbanov, Petar Sabev & Klemeš, Jiří Jaromír & Zeng, Min & Wang, Qiu-Wang, 2020. "Long-term investment and maintenance planning for heat exchanger network retrofit," Applied Energy, Elsevier, vol. 279(C).
    4. Wang, Bohong & Arsenyeva, Olga & Zeng, Min & Klemeš, Jiří Jaromír & Varbanov, Petar Sabev, 2022. "An advanced Grid Diagram for heat exchanger network retrofit with detailed plate heat exchanger design," Energy, Elsevier, vol. 248(C).
    5. Bohong Wang & Jiří Jaromír Klemeš & Petar Sabev Varbanov & Min Zeng, 2020. "An Extended Grid Diagram for Heat Exchanger Network Retrofit Considering Heat Exchanger Types," Energies, MDPI, vol. 13(10), pages 1-14, May.
    6. Wang, Bohong & Klemeš, Jiří Jaromír & Li, Nianqi & Zeng, Min & Varbanov, Petar Sabev & Liang, Yongtu, 2021. "Heat exchanger network retrofit with heat exchanger and material type selection: A review and a novel method," Renewable and Sustainable Energy Reviews, Elsevier, vol. 138(C).
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