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Clean coal technology using process integration : a focus on the IGCC
Dissertation (MEng)--University of Pretoria, 2011.
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University of Pretoria
2013
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| _version_ | 1867613694589927424 |
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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 | © 2010, 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, 2011. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/28877 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:40:13.301Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| 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:2263/28877 Clean coal technology using process integration : a focus on the IGCC Majozi, Thokozani vhutshilo.madzivhandila@sasol.com Madzivhandila, Vhutshilo A. Coal Integrated gasification combined cycle Igcc Coal-fired power generation plants UCTD Dissertation (MEng)--University of Pretoria, 2011. The integrated gasification combined cycle (IGCC) is the most environmentally friendly coal-fired power generation technology that offers near zero green house gas emissions. This technology has higher thermal efficiency compared to conventional coal-fired power generation plants and uses up to 50% less water. This work involves the optimization of IGCC power plants by applying process integration techniques to maximize the use of energy available within the plant. The basis of this project was the theoretical investigations which showed that optimally designed and operated IGCC plants can achieve overall thermal efficiencies in the regions of 60%. None of the current operating IGCC plants approach this overall thermal efficiency, with the largest capacity plant attaining 47%. A common characteristic in most of these IGCC plants is that an appreciable amount of energy available within the system is lost to the environment through cold utility, and through plant irreversibility to a smaller extent. This work focuses on the recovery of energy, that is traditionally lost as cold utility, through application of proven process integration techniques. The methodology developed comprises of two primary energy optimization techniques, i.e. pinch analysis and the contact economizer system. The idea behind using pinch analysis was to target for the maximum steam flowrate, which will in turn improve the power output of the steam turbine. An increase in the steam turbine power output should result in an increase in the overall thermal efficiency of the plant. The contact economizer system is responsible for the recovery of low potential heat from the gas turbine exhaust en route to the stack to heat up the boiler feed water (BFW). It was proven in this work that a higher BFW enthalpy results in a higher overall efficiency of the plant. A case study on the Elcogas plant illustrated that the developed method is capable of increasing the gross efficiency from 47% to 55%. This increase in efficiency, however, comes at an expense of increased heat exchange area required to exchange the extra heat that was not utilized in the preliminary design. Chemical Engineering unrestricted 2013-09-07T14:24:09Z 2011-10-21 2013-09-07T14:24:09Z 2011-09-06 2011-10-21 2011-10-20 Dissertation Madzivhandila, V 2010, Clean coal technology using process integration : a focus on the IGCC, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/28877 > E11/9/139/gm http://hdl.handle.net/2263/28877 http://upetd.up.ac.za/thesis/available/etd-10202011-120436/ © 2010, 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 | Coal Integrated gasification combined cycle Igcc Coal-fired power generation plants UCTD Clean coal technology using process integration : a focus on the IGCC |
| title | Clean coal technology using process integration : a focus on the IGCC |
| title_full | Clean coal technology using process integration : a focus on the IGCC |
| title_fullStr | Clean coal technology using process integration : a focus on the IGCC |
| title_full_unstemmed | Clean coal technology using process integration : a focus on the IGCC |
| title_short | Clean coal technology using process integration : a focus on the IGCC |
| title_sort | clean coal technology using process integration a focus on the igcc |
| topic | Coal Integrated gasification combined cycle Igcc Coal-fired power generation plants UCTD |
| url | http://hdl.handle.net/2263/28877 http://upetd.up.ac.za/thesis/available/etd-10202011-120436/ |