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Automated retrofit targeting of heat exchanger networks

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Abstract

The aim of this paper is to develop a novel heat exchanger network (HEN) retrofit method based on a new automated retrofit targeting (ART) algorithm. ART uses the heat surplus-deficit table (HSDT) in combination with the Bridge Retrofit concepts to generate retrofit bridges option, from which a retrofit design may be formulated. The HSDT is a tabular tool that shows potential for improved re-integration of heat source and sink streams within a HEN. Using the HSDT, retrofit bridges—a set of modifications that links a cooler to a heater to save energy—may be identified, quantified, and compared. The novel retrofit method including the ART algorithm has been successfully implemented in Microsoft ExcelTM to enable analysis of large-scale HENs. A refinery case study with 27 streams and 46 existing heat exchangers demonstrated the retrofit method’s potential. For the case study, the ART algorithm found 68903 feasible unique retrofit opportunities with a minimum 400 kW·unit–1 threshold for heat recovery divided by the number of new units. The most promising retrofit project required 3 new heat exchanger units to achieve a heat savings of 4.24 MW with a favorable annualised profit and a reasonable payback period.

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Acknowledgements

This research has been supported by: the EU project “Sustainable Process Integration Laboratory – SPIL,” project No. CZ.02.1.01/0.0/0.0/15_003/0000456 funded by EU “CZ Operational Programme Research and Development, Education,” Priority 1: Strengthening capacity for quality research, in a collaboration agreement with the University of Waikato, New Zealand; and, the Todd Foundation Energy PhD Research Scholarship.

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Authors and Affiliations

  1. Sustainable Process Integration Laboratory – SPIL, NETME Centre, Faculty of Mechanical Engineering, Brno University of Technology, Brno, 60190, Czech Republic

    Timothy G. Walmsley, Petar S. Varbanov & Jiří J. Klemeš

  2. Energy Research Centre, School of Engineering, University of Waikato, Hamilton, 3240, New Zealand

    Nathan S. Lal

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  1. Timothy G. Walmsley
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  2. Nathan S. Lal
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  3. Petar S. Varbanov
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  4. Jiří J. Klemeš
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Correspondence to Timothy G. Walmsley.

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Walmsley, T.G., Lal, N.S., Varbanov, P.S. et al. Automated retrofit targeting of heat exchanger networks. Front. Chem. Sci. Eng. 12, 630–642 (2018). https://doi.org/10.1007/s11705-018-1747-2

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  • DOI: https://doi.org/10.1007/s11705-018-1747-2

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