Multiphase models of slag layer built-up in solid fuel gasification and combustion
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2011
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| Online Access: | http://hdl.handle.net/1721.1/61928 |
| _version_ | 1811093852794126336 |
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| author | Yong, Sze Zheng |
| author2 | Ahmed F. Ghoniem. |
| author_facet | Ahmed F. Ghoniem. Yong, Sze Zheng |
| author_sort | Yong, Sze Zheng |
| collection | MIT |
| description | Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010. |
| first_indexed | 2024-09-23T15:51:43Z |
| format | Thesis |
| id | mit-1721.1/61928 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T15:51:43Z |
| publishDate | 2011 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/619282019-04-11T07:00:36Z Multiphase models of slag layer built-up in solid fuel gasification and combustion Yong, Sze Zheng Ahmed F. Ghoniem. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Mechanical Engineering. Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010. Cataloged from PDF version of thesis. Includes bibliographical references (p. 124-127). A steady-state model has been developed to describe the flow and heat transfer characteristics of slag. The model incorporates two submodels for particle capture and wall burning; takes into consideration the temperature and composition dependent properties of slag, the contribution of momentum of captured particles and the possibility of slag resolidification. The model predicts the local thickness of molten and solid slag layers as well as the average slag velocity. Moreover, it is capable of predicting heat losses and the inner as well as outer wall temperatures, taking into account the influence of molten and resolidified slag layers coating the combustor or reactor wall. An equally important issue is the interaction of the particles colliding with the slag layer. High inertia particles tend to rebound whereas slower particles are trapped in the slag layer. Since only trapped particles are relevant to the slag layer built-up, a particle capture criterion for colliding particles is introduced. Particles with combustibles may be captured by the slag layer while they continue to bum at a different rate. To take this into account, a wall burning submodel is proposed to predict a correction factor for both solid and porous char combustion models. by Sze Zheng Yong. S.M. 2011-03-24T20:28:06Z 2011-03-24T20:28:06Z 2010 2010 Thesis http://hdl.handle.net/1721.1/61928 707355837 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 127 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Mechanical Engineering. Yong, Sze Zheng Multiphase models of slag layer built-up in solid fuel gasification and combustion |
| title | Multiphase models of slag layer built-up in solid fuel gasification and combustion |
| title_full | Multiphase models of slag layer built-up in solid fuel gasification and combustion |
| title_fullStr | Multiphase models of slag layer built-up in solid fuel gasification and combustion |
| title_full_unstemmed | Multiphase models of slag layer built-up in solid fuel gasification and combustion |
| title_short | Multiphase models of slag layer built-up in solid fuel gasification and combustion |
| title_sort | multiphase models of slag layer built up in solid fuel gasification and combustion |
| topic | Mechanical Engineering. |
| url | http://hdl.handle.net/1721.1/61928 |
| work_keys_str_mv | AT yongszezheng multiphasemodelsofslaglayerbuiltupinsolidfuelgasificationandcombustion |