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Study of Underground Coal Gasification and Carbon Storage in the Residual Cavity
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- Author / Creator
- Khan, Md
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Underground coal gasification (UCG) is a process of ‘in-situ’ conversion of coal into gaseous products with usable heating value through combustion with oxygen/air and gasification with steam. From the economic and environmental point of view, UCG is a highly promising clean energy technology which has a potential to meet the increasing energy demands in several countries. Moreover, the voids created in deep underground following gasification generate the intriguing possibility of storing carbon dioxide. Since, in-situ UCG is a complex process, laboratory-scale experiments on coal blocks/packed beds can provide significant insight into UCG process. In this study, several laboratory scale experiments have been carried out to observe the effect of feed flow rate, steam injection, initial combustion etc. on product gas compositions. Results and limitations of the experiments are discussed in detail.
In general, post-gasification sites consist of a tear-drop shape cavity with ash and rubble left at the bottom. The residual coal seam can be broadly classified as the partially-gasified char layer, the pyrolyzed char layers, and the raw coal layer. A series of carbon dioxide adsorption experiments have been carried out to assess the carbon dioxide capture and storage capacity (CCS) of the coal and pyrolyzed/gasified chars. The results from this study suggested that UCG-CCS process is feasible. -
- Graduation date
- Fall 2018
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- Type of Item
- Thesis
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- Degree
- Doctor of Philosophy
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- License
- Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.