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      Assisted heat transfer and shaft work targets for increased total site heat integration

      Walmsley, Timothy Gordon; Atkins, Martin John; Tarighaleslami, Amir Hossein; Liew, Peng Yen
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      2016 walmsley atkins tarighaleslami liew Chemical Engineering Transactions.pdf
      Published version, 1.135Mb
      DOI
       10.3303/CET1652068
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      Walmsley, T. G., Atkins, M. J., Tarighaleslami, A. H., & Liew, P. Y. (2016). Assisted heat transfer and shaft work targets for increased total site heat integration. Chemical Engineering Transactions, 52, 403–408. https://doi.org/10.3303/CET1652068
      Permanent Research Commons link: https://hdl.handle.net/10289/10860
      Abstract
      Total Site Heat Integration (TSHI) provides a valuable framework for practical integration of multiple energy users. Previous studies have introduced the idea of utilising process heat recovery pockets to assist TSHI. However, these methods are shown to be effective for only some Total Site (TS) problems. As a result, this paper presents a new method for calculating assisted heat transfer and shaft work targets for an example TS problem. Analysis results show that assisted heat transfer increases TSHI only when a process heat recovery pocket spans the TS Pinch Region. The maximum assisted TSHI can be targeted by comparing each heat recovery pocket to the Site Utility Grand Composite Curve (SUGCC) using background/foreground analysis. Where heat recovery pockets span two steam pressure levels away from the TS Pinch Region (usually above), the example shows the potential for assisted shaft work production. In this case, the source segment of the heat recovery pocket generates steam (e.g. MPS), which replaces steam that would otherwise have been extracted from a steam turbine. The sink segment of the heat recovery pocket consumes lower pressure steam (e.g. LPS), which is extracted from the turbine. If a heat recovery pocket falls outside these two situations (assuming direct inter-process integration is disallowed), the entire pocket should be recovered internal to a process.
      Date
      2016
      Type
      Journal Article
      Publisher
      AIDIC
      Rights
      Copyright © 2016, AIDIC Servizi S.r.l.. Used with permission.
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      • Science and Engineering Papers [3122]
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