Evaluation of sorbents for the cleanup of coal-derived synthesis gas at elevated temperatures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2012.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2012
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| Online Access: | http://hdl.handle.net/1721.1/70404 |
| _version_ | 1826215472310255616 |
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| author | Couling, David Joseph |
| author2 | William H. Green. |
| author_facet | William H. Green. Couling, David Joseph |
| author_sort | Couling, David Joseph |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2012. |
| first_indexed | 2024-09-23T16:30:47Z |
| format | Thesis |
| id | mit-1721.1/70404 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T16:30:47Z |
| publishDate | 2012 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/704042019-04-11T14:15:58Z Evaluation of sorbents for the cleanup of coal-derived synthesis gas at elevated temperatures Couling, David Joseph William H. Green. Massachusetts Institute of Technology. Dept. of Chemical Engineering. Massachusetts Institute of Technology. Dept. of Chemical Engineering. Chemical Engineering. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2012. Cataloged from PDF version of thesis. Includes bibliographical references (p. 173-182). Integrated Gasification Combined Cycle (IGCC) with carbon dioxide capture is a promising technology to produce electricity from coal at a higher efficiency than with traditional subcritical pulverized coal (PC) power plants. As with any coal-based technology, however, it is of critical importance to develop efficient techniques to reduce the emissions of its many environmental pollutants, including not only carbon dioxide, but also sulfur and trace metals such as lead or mercury. One potential method to improve the efficiency for IGCC is through the use of solid sorbents that operate at elevated temperatures. Because many of these technologies are in their infancy and have yet to be commercially demonstrated, a strong desire exists to develop methods to critically evaluate these technologies more rapidly and inexpensively than can be done through experiments alone. In this thesis we applied computational techniques to investigate the feasibility of sorbents for the warm temperature removal of two key pollutants, carbon dioxide and mercury. We developed pressure swing adsorption models for the removal of carbon dioxide using both metal oxide and metal hydroxide sorbents and incorporated them into IGCC process simulations in Aspen Plus in order to evaluate the energy penalties associated with using these carbon dioxide capture technologies. We identified the optimal properties of CO2 sorbents for this application. Although warm CO2 capture using solid sorbents could lead to slight efficiency increases over conventional cold cleanup methods, the potential gains are much smaller than previously estimated. In addition, we used density functional theory to screen binary metal alloys, metal oxides, and metal sulfides as potential sorbents for mercury capture. We computed the thermochemistry of 40 different potential mercury sorbents to evaluate their affinity for mercury at the low concentrations and elevated temperatures found in the coal gas stream. We also evaluated the tendency of these sorbent materials to react with major components of the gas stream, such as hydrogen or steam. Finally, we tested the mercury adsorption characteristics of three of the most promising materials experimentally. Our experimental observations showed good qualitative agreement with our density functional theory calculations. by David Joseph Couling. Ph.D. 2012-04-26T18:50:19Z 2012-04-26T18:50:19Z 2012 2012 Thesis http://hdl.handle.net/1721.1/70404 784104269 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 182 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Chemical Engineering. Couling, David Joseph Evaluation of sorbents for the cleanup of coal-derived synthesis gas at elevated temperatures |
| title | Evaluation of sorbents for the cleanup of coal-derived synthesis gas at elevated temperatures |
| title_full | Evaluation of sorbents for the cleanup of coal-derived synthesis gas at elevated temperatures |
| title_fullStr | Evaluation of sorbents for the cleanup of coal-derived synthesis gas at elevated temperatures |
| title_full_unstemmed | Evaluation of sorbents for the cleanup of coal-derived synthesis gas at elevated temperatures |
| title_short | Evaluation of sorbents for the cleanup of coal-derived synthesis gas at elevated temperatures |
| title_sort | evaluation of sorbents for the cleanup of coal derived synthesis gas at elevated temperatures |
| topic | Chemical Engineering. |
| url | http://hdl.handle.net/1721.1/70404 |
| work_keys_str_mv | AT coulingdavidjoseph evaluationofsorbentsforthecleanupofcoalderivedsynthesisgasatelevatedtemperatures |