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Adapting an existing batch pulp digester model for use in continuous digesters
Dissertation (MEng (Control Engineering))--University of Pretoria, 2020.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2023
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| _version_ | 1867613503544623104 |
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| access_status_str | Open Access |
| author2 | Sandrock, Carl |
| author_browse | Sandrock, Carl |
| author_facet | Sandrock, Carl |
| collection | Thesis |
| dc_rights_str_mv | © 2022 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 Engineering))--University of Pretoria, 2020. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/90200 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:11.117Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| 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:2263/90200 Adapting an existing batch pulp digester model for use in continuous digesters Sandrock, Carl u15072292@tuks.co.za Sandrock, Carl de Bruin, Johannes Daniël UCTD Kappa number Kraft digester Continuous digester model Sappi Ngodwana Mill Engineering, built environment and information technology theses SDG-09 Engineering, built environment and information technology theses SDG-12 Engineering, built environment and information technology theses SDG-15 Dissertation (MEng (Control Engineering))--University of Pretoria, 2020. A mathematical model of a continuous Kraft wood digester was developed and tested. The model relies heavily on the work done previously by Christensen, Albright & Williams (1982). The batch Kraft digester model developed by Christensen et al (1982) was adapted to model a continuous Kraft wood digester at Ngodwana, South Africa. This adaptation centres around utilizing the method of lines to account for changes in both time and height of the digester simultaneously. The model was able to simulate the Kappa number of the digester accurately to an average absolute error of 7.88 that was reduced to 2.87 after certain process parameters were optimized for. A moving horizon state estimator was introduced into the model in an effort to keep internal state prediction accurate. This addition brought the average absolute error down further to 2.75. Adaptive control was also implemented into the model. The plant data the model was compared against to determine its accuracy was filtered with the use of a rolling median filter to reduce the influence introduced by noisy and infrequent measurements. Sappi mi2026 Chemical Engineering MEng (Control Engineering) Unrestricted SDG-09: Industry, innovation and infrastructure SDG-12: Responsible consumption and production SDG-15: Life on land 2023-03-24T07:47:49Z 2023-03-24T07:47:49Z 2023 2020 Dissertation * A2023 http://hdl.handle.net/2263/90200 10.25403/UPresearchdata.22302685 en © 2022 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 | UCTD Kappa number Kraft digester Continuous digester model Sappi Ngodwana Mill Engineering, built environment and information technology theses SDG-09 Engineering, built environment and information technology theses SDG-12 Engineering, built environment and information technology theses SDG-15 Adapting an existing batch pulp digester model for use in continuous digesters |
| title | Adapting an existing batch pulp digester model for use in continuous digesters |
| title_full | Adapting an existing batch pulp digester model for use in continuous digesters |
| title_fullStr | Adapting an existing batch pulp digester model for use in continuous digesters |
| title_full_unstemmed | Adapting an existing batch pulp digester model for use in continuous digesters |
| title_short | Adapting an existing batch pulp digester model for use in continuous digesters |
| title_sort | adapting an existing batch pulp digester model for use in continuous digesters |
| topic | UCTD Kappa number Kraft digester Continuous digester model Sappi Ngodwana Mill Engineering, built environment and information technology theses SDG-09 Engineering, built environment and information technology theses SDG-12 Engineering, built environment and information technology theses SDG-15 |
| url | http://hdl.handle.net/2263/90200 |