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Implementation and performance analysis of a model-based controller on a batch pulp digester
Dissertation (MEng (Control))--University of Pretoria, 2003.
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| Format: | Thesis |
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University of Pretoria
2013
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| _version_ | 1867613438193172480 |
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| access_status_str | Open Access |
| author2 | De Vaal, Philip L. |
| author_browse | De Vaal, Philip L. |
| author_facet | De Vaal, Philip L. |
| collection | Thesis |
| dc_rights_str_mv | © 2003, 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 (Control))--University of Pretoria, 2003. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/28717 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:36:08.960Z |
| 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:2263/28717 Implementation and performance analysis of a model-based controller on a batch pulp digester De Vaal, Philip L. carl.sandrock@up.ac.za Sandrock, Carl Model based control Monte carlo Performance analysis Batch control Pulping Sulphite process UCTD Dissertation (MEng (Control))--University of Pretoria, 2003. The control of batch pulp digesters is hampered by insufficient measurements as well as nonlinearity and weak correlation between consecutive cooks. This makes a model-based approach to control attractive. Due to the age of the industry, many legacy controllers are in place on digesters around the world. The theoretical variance obtained by Monte Carlo modelling of a new controller is used as a benchmark for performance comparison between an old control system (S-factor) and a new model based controller developed by the University of Pretoria (the UP controller). This study covers the development of the controller, Monte Carlo modelling of the old and new controllers and in-situ testing of the UP controller on an operating digester. During Monte Carlo simulation, the UP controller outperformed the legacy controller, obtaining a theoretical overall variance of 3,07 (which will be used as the baseline for performance measurement) while also showing larger responses to tuning factors. The S-factor performed at 6,8 times the theoretical optimum variance during in situ testing, while the UP controller performed at 3,9 times the theoretical optimum (43% better than the S-factor controller). An average error 90% lower than that of the S-factor controller was obtained when using the UP controller. Additional benefits of the new controller include easy inclusion of new measurements and clear relations between the tuning parameters used and the conditions in the digester. Chemical Engineering unrestricted 2013-09-07T14:07:49Z 2004-10-19 2013-09-07T14:07:49Z 2003-10-31 2003 2004-10-15 Dissertation Sandrock, C 2003, Implementation and performance analysis of a model-based controller on a batch pulp digester, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/28717 > http://hdl.handle.net/2263/28717 http://upetd.up.ac.za/thesis/available/etd-10152004-113239/ © 2003, 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 | Model based control Monte carlo Performance analysis Batch control Pulping Sulphite process UCTD Implementation and performance analysis of a model-based controller on a batch pulp digester |
| title | Implementation and performance analysis of a model-based controller on a batch pulp digester |
| title_full | Implementation and performance analysis of a model-based controller on a batch pulp digester |
| title_fullStr | Implementation and performance analysis of a model-based controller on a batch pulp digester |
| title_full_unstemmed | Implementation and performance analysis of a model-based controller on a batch pulp digester |
| title_short | Implementation and performance analysis of a model-based controller on a batch pulp digester |
| title_sort | implementation and performance analysis of a model based controller on a batch pulp digester |
| topic | Model based control Monte carlo Performance analysis Batch control Pulping Sulphite process UCTD |
| url | http://hdl.handle.net/2263/28717 http://upetd.up.ac.za/thesis/available/etd-10152004-113239/ |