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Test rig design to simulate ashlock valve erosion in coal gasification systems
The erosion of ashlock hopper valves in coal gasification systems, and the maintainance downtime resulting from this erosion, is a cause of considerable concern to the coal conversion industry. After an assessment of the factors considered relevant to solid particle erosion as presented in literatur...
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| Format: | Thesis |
| Language: | English |
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Centre for Materials Engineering
2016
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| _version_ | 1867613189960630272 |
|---|---|
| access_status_str | Open Access |
| author | Willmott, Simon Spencer |
| author2 | Ball, Anthony |
| author_browse | Ball, Anthony Willmott, Simon Spencer |
| author_facet | Ball, Anthony Willmott, Simon Spencer |
| author_sort | Willmott, Simon Spencer |
| collection | Thesis |
| description | The erosion of ashlock hopper valves in coal gasification systems, and the maintainance downtime resulting from this erosion, is a cause of considerable concern to the coal conversion industry. After an assessment of the factors considered relevant to solid particle erosion as presented in literature, a design for a laboratory test apparatus to closely simulate the in-service problem was proposed. A test rig prototype, reproducing service conditions of temperature, pressure and geometry, was constructed and preliminary testing conducted. Various problems impairing the efficient operation of the test facility became apparent and these, together with the proposed solutions and modifications to the prototype rig, are discussed. Both room temperature and elevated temperature (400°C) erosion tests were conducted on the hardfacing seat material presently used on site as well as a on selection of common engineering materials. Optical and scanning electron microscopy (SEM) studies revealed a close correlation between in-situ and laboratory erosion damage, suggesting that the test apparatus is a valid simulation of the service problem. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/21861 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:12.136Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Centre for Materials Engineering |
| publisherStr | Centre for Materials Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/21861 Test rig design to simulate ashlock valve erosion in coal gasification systems Willmott, Simon Spencer Ball, Anthony Materials Engineering The erosion of ashlock hopper valves in coal gasification systems, and the maintainance downtime resulting from this erosion, is a cause of considerable concern to the coal conversion industry. After an assessment of the factors considered relevant to solid particle erosion as presented in literature, a design for a laboratory test apparatus to closely simulate the in-service problem was proposed. A test rig prototype, reproducing service conditions of temperature, pressure and geometry, was constructed and preliminary testing conducted. Various problems impairing the efficient operation of the test facility became apparent and these, together with the proposed solutions and modifications to the prototype rig, are discussed. Both room temperature and elevated temperature (400°C) erosion tests were conducted on the hardfacing seat material presently used on site as well as a on selection of common engineering materials. Optical and scanning electron microscopy (SEM) studies revealed a close correlation between in-situ and laboratory erosion damage, suggesting that the test apparatus is a valid simulation of the service problem. 2016-09-25T16:11:04Z 2016-09-25T16:11:04Z 1984 Master Thesis Masters MSc http://hdl.handle.net/11427/21861 eng application/pdf Centre for Materials Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Materials Engineering Willmott, Simon Spencer Test rig design to simulate ashlock valve erosion in coal gasification systems |
| thesis_degree_str | Master's |
| title | Test rig design to simulate ashlock valve erosion in coal gasification systems |
| title_full | Test rig design to simulate ashlock valve erosion in coal gasification systems |
| title_fullStr | Test rig design to simulate ashlock valve erosion in coal gasification systems |
| title_full_unstemmed | Test rig design to simulate ashlock valve erosion in coal gasification systems |
| title_short | Test rig design to simulate ashlock valve erosion in coal gasification systems |
| title_sort | test rig design to simulate ashlock valve erosion in coal gasification systems |
| topic | Materials Engineering |
| url | http://hdl.handle.net/11427/21861 |
| work_keys_str_mv | AT willmottsimonspencer testrigdesigntosimulateashlockvalveerosionincoalgasificationsystems |