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Steam System Network Analysis, Synthesis and Optimisation
Dissertation (MEng)--University of Pretoria, 2013.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2014
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| _version_ | 1867613648452583424 |
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| access_status_str | Open Access |
| author2 | Majozi, Thokozani |
| author_browse | Majozi, Thokozani |
| author_facet | Majozi, Thokozani |
| collection | Thesis |
| dc_rights_str_mv | © 2013 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria |
| description | Dissertation (MEng)--University of Pretoria, 2013. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/33340 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:29.475Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/33340 Steam System Network Analysis, Synthesis and Optimisation Majozi, Thokozani Beangstrom, Sheldon Grant Steam Plants Single high pressure steam level UCTD Dissertation (MEng)--University of Pretoria, 2013. Steam is a commonplace utility in chemical processing plants across the globe. The many benefits of steam ensure its continued use, but concerns about the cost of energy and of the equipment associated with steam systems has led to the development of a number of techniques to reduce energy and capital costs. One such topic is the reduction of boiler purchase cost, brought about by a reduction in steam flowrate. Recent publications have shown that the flowrate of steam required for heating purposes can be minimised by employing hot liquid reuse, with systematic methods developed for targeting the minimum flowrate, and synthesising the heat exchanger network. In this work, a mathematical analysis has been performed to gain insight on how choosing different steam levels affects the minimum total steam flowrate. The analysis covered both the traditional practice of only utilising latent heat, as well as the new practice of hot liquid reuse. It was found that the lowest flowrate obtainable occurs in the case of hot liquid reuse, when only a single high pressure steam level is considered. Since the need to provide shaft work or generate electricity necessitates the presence of steam turbines on plants, the inclusion of additional steam levels is unavoidable. For this reason, a novel MINLP formulation was developed to provide a holistic coverage of the heat exchanger network and the power block. The purpose of the new formulation is to target the minimum total steam flowrate, whilst simultaneously selecting the optimum saturation temperatures for the additional steam levels, designing the turbines to meet shaft work requirements and synthesizing the heat exchanger network. Application of this new method to a case study yielded a 28.6% reduction in total steam flowrate, compared to common design practice. i I, Sheldon Grant Beangstrom, with student number 27069771, declare that: I understand what plagiarism entails and am aware of the University of Pretoria‟s policy in this regard. This dissertation is my own, original work. Where the work of another has been used (whether from a printed source, the internet or otherwise) due acknowledgement has been given and reference made in accordance with the departmental guidelines. I have not made use of another student‟s previous work in an attempt to submit it as my own. I have not allowed, nor will I allow another person to copy this work with the intention of presenting it as his or her own work. The material presented in this dissertation has not been submitted to another institution in partial or whole fulfilment of another degree. gm2014 Chemical Engineering unrestricted 2014-02-11T05:11:30Z 2014-02-11T05:11:30Z 2013-09-04 2013 Dissertation Beanstrom, SG 2013, Steam System Network Analysis, Synthesis and Optimisation, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/33340> E13/9/1013/gm http://hdl.handle.net/2263/33340 en © 2013 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria application/pdf University of Pretoria |
| spellingShingle | Steam Plants Single high pressure steam level UCTD Steam System Network Analysis, Synthesis and Optimisation |
| title | Steam System Network Analysis, Synthesis and Optimisation |
| title_full | Steam System Network Analysis, Synthesis and Optimisation |
| title_fullStr | Steam System Network Analysis, Synthesis and Optimisation |
| title_full_unstemmed | Steam System Network Analysis, Synthesis and Optimisation |
| title_short | Steam System Network Analysis, Synthesis and Optimisation |
| title_sort | steam system network analysis synthesis and optimisation |
| topic | Steam Plants Single high pressure steam level UCTD |
| url | http://hdl.handle.net/2263/33340 |