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dc.contributor.authorLal, Nathan S.en_NZ
dc.contributor.authorWalmsley, Timothy Gordonen_NZ
dc.contributor.authorAtkins, Martin Johnen_NZ
dc.contributor.authorWalmsley, Michael R.W.en_NZ
dc.contributor.authorNeale, James R.en_NZ
dc.date.accessioned2019-12-12T01:38:55Z
dc.date.available2018-01-01en_NZ
dc.date.available2019-12-12T01:38:55Z
dc.date.issued2018en_NZ
dc.identifier.citationLal, N. S., Walmsley, T. G., Atkins, M. J., Walmsley, M. R. W., & Neale, J. R. (2018). Solving complex retrofit problems using constraints and bridge analysis. Chemical Engineering Transactions, 70, 1951–1956. https://doi.org/10.3303/CET1870326en
dc.identifier.urihttps://hdl.handle.net/10289/13310
dc.description.abstractThe aim of this paper is to conduct retrofit analysis of large, complex industrial Heat Exchanger Networks using an automated Bridge Analysis. Large, complex networks have many different possible retrofit designs, or Retrofit Bridges, which requires both computational effort and user effort to evaluate. In this paper, constraints relating to the thermodynamic and economic performance of a retrofit design are proposed and applied to significantly reduce Retrofit Bridge options to a smaller, manageable number of design options. These constraints relate to capital costs, payback period, piping, and plant layout. The method is demonstrated with a Kraft pulp mill case study. The Kraft pulp mill currently has 54 heat exchangers and 73 hot and cold streams. Without constraints, the number of possible Retrofit Bridges is 1 x 10²⁰. After applying the constraints, this number is reduced to 15. The remaining Retrofit Bridges are considered to provide high thermodynamic and economic benefit and can be more easily assessed for the best projects. The use of constraints has allowed the complex case study to be solved quickly, and a single design can be selected for further development. The suggested design reduces the utility consumption by 9.2 MW and has an annual Total Retrofit Profit of NZD 2,140,000, requiring a single new exchanger.
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.rights© 2018, AIDIC Servizi S.r.l. Used with permission.
dc.titleSolving complex retrofit problems using constraints and bridge analysisen_NZ
dc.typeJournal Article
dc.identifier.doi10.3303/CET1870326en_NZ
dc.relation.isPartOfChemical Engineering Transactionsen_NZ
pubs.begin-page1951
pubs.elements-id226535
pubs.end-page1956
pubs.publication-statusPublisheden_NZ
pubs.volume70en_NZ
dc.identifier.eissn2283-9216en_NZ


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