Citation
Chang, Karl Kho-Chung (1985) Calcium-Ion Exchange of Coal for Retention of Sulfur During Combustion. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/X4W7-D106. https://resolver.caltech.edu/CaltechETD:etd-08092006-145027
Abstract
The kinetics of calcium-ion exchange of coal and the combustion of calcium-exchanged coals in a laminar flow furnace were investigated. Particle diffusion was found to be the rate-determining step for the process of ion exchange. A diffusion model gave good agreement with observed rates of ion exchange. Diffusion of ions in PSOC 680, a bituminous coal, was observed to be much slower than in PSOC 623, a lignite.
Retention of sulfur during combustion of calcium-exchanged coals was observed to increase with increasing particle residence and oxygen concentration in the combustion gas. Chemical reaction was found to be the rate-determining step in the capture of SO2 by CaO in coal ash. The results of this study were interpreted in a proposed mechanism for the release and capture of SO2.
| Item Type: | Thesis (Dissertation (Ph.D.)) | ||||||
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| Subject Keywords: | Chemical Engineering | ||||||
| Degree Grantor: | California Institute of Technology | ||||||
| Division: | Chemistry and Chemical Engineering | ||||||
| Major Option: | Chemical Engineering | ||||||
| Thesis Availability: | Public (worldwide access) | ||||||
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| Defense Date: | 7 January 1985 | ||||||
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| Record Number: | CaltechETD:etd-08092006-145027 | ||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechETD:etd-08092006-145027 | ||||||
| DOI: | 10.7907/X4W7-D106 | ||||||
| Default Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
| ID Code: | 3074 | ||||||
| Collection: | CaltechTHESIS | ||||||
| Deposited By: | Imported from ETD-db | ||||||
| Deposited On: | 23 Aug 2006 | ||||||
| Last Modified: | 21 Dec 2019 02:58 |
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