Kinetic Study on Low-Rank Coal Char: Characterization and Catalytic Gasification
Publication: Journal of Energy Engineering
Volume 142, Issue 3
Abstract
A kinetic characterization of the gasification of chars from Chinese low-rank lignite coal is performed by isothermal thermogravimetry. The isothermal condition is 1,073 K, and the concentration range is 10–90%. Alkali and alkali earth catalysts were used to promote the gasification reactivity. The gasification rate of the char was increased with the carbon dioxide () concentration. The gasification rate increment was reduced at a higher concentration, which inhibited the gasification rate. The best ratio for gasification was 70%. The gasification rate of the char with is fast and proceeded in the following order: sodium carbonate carbonate carbonate . In this study, the following gas–solid reaction models are compared: the shrinking core model, the volumetric reaction model, the modified volumetric reaction model (MVRM), and the random pore model. The correlation coefficient values of the MVRM were the highest of all the models at all concentrations.
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Acknowledgments
This work was conducted under the framework of the Research and Development Program of the Korea Institute of Energy Research (KIER) (B4-2432-01).
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Published In
Journal of Energy Engineering
Volume 142 • Issue 3 • September 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Aug 14, 2014
Accepted: May 27, 2015
Published online: Jul 21, 2015
Discussion open until: Dec 21, 2015
Published in print: Sep 1, 2016
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