Mechanisms and kinetic modelling of steam gasification of brown coal in the presence of volatile–char interactions
It is known that Victorian brown coal has higher reactivity for gasification because of catalysis of inherent AAEMspecies than high-rank coal. However, the experimental results of steam gasification of brown coal in a fluidised-bed/fixed-bed reactor at 800 C have suggested that the inhibitory effect...
| Main Authors: | , , , |
|---|---|
| Format: | Journal Article |
| Published: |
Elsevier Science Ltd
2013
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/44757 |
| _version_ | 1848757092979048448 |
|---|---|
| author | kajitani, Shiro Tay, Hui-ling Zhang, Shu Li, Chun-Zhu |
| author_facet | kajitani, Shiro Tay, Hui-ling Zhang, Shu Li, Chun-Zhu |
| author_sort | kajitani, Shiro |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | It is known that Victorian brown coal has higher reactivity for gasification because of catalysis of inherent AAEMspecies than high-rank coal. However, the experimental results of steam gasification of brown coal in a fluidised-bed/fixed-bed reactor at 800 C have suggested that the inhibitory effects of the volatile–char interactions on char gasification are not negligible. The mechanisms and kinetics model of the char gasification and volatile–char interactions were discussed to describe quantitatively the inhibition of char gasification by volatiles, in this study. The elementary reactions of the char gasification and volatile–char interactions, which are consist of the adsorption of free radicals from volatiles, the volatilisation of catalyst and the evolution of char structure affected by radicals from volatiles, were proposed. The L-H type reaction rate equations for brown coal gasification were determined, and the kinetics model was verified by the comparison with several series of experiments. The proposed kinetics model described the experimental results of the coal conversions and the concentrations of Na in char during steam gasification very well. This kinetics model would be useful in designing any industrial fluidised-bed gasifier for low-rank fuels and estimating their performance. |
| first_indexed | 2025-11-14T09:22:36Z |
| format | Journal Article |
| id | curtin-20.500.11937-44757 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:22:36Z |
| publishDate | 2013 |
| publisher | Elsevier Science Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-447572017-02-28T01:37:39Z Mechanisms and kinetic modelling of steam gasification of brown coal in the presence of volatile–char interactions kajitani, Shiro Tay, Hui-ling Zhang, Shu Li, Chun-Zhu Victorian brown coal Volatile–char interactions Kinetics Gasification It is known that Victorian brown coal has higher reactivity for gasification because of catalysis of inherent AAEMspecies than high-rank coal. However, the experimental results of steam gasification of brown coal in a fluidised-bed/fixed-bed reactor at 800 C have suggested that the inhibitory effects of the volatile–char interactions on char gasification are not negligible. The mechanisms and kinetics model of the char gasification and volatile–char interactions were discussed to describe quantitatively the inhibition of char gasification by volatiles, in this study. The elementary reactions of the char gasification and volatile–char interactions, which are consist of the adsorption of free radicals from volatiles, the volatilisation of catalyst and the evolution of char structure affected by radicals from volatiles, were proposed. The L-H type reaction rate equations for brown coal gasification were determined, and the kinetics model was verified by the comparison with several series of experiments. The proposed kinetics model described the experimental results of the coal conversions and the concentrations of Na in char during steam gasification very well. This kinetics model would be useful in designing any industrial fluidised-bed gasifier for low-rank fuels and estimating their performance. 2013 Journal Article http://hdl.handle.net/20.500.11937/44757 Elsevier Science Ltd restricted |
| spellingShingle | Victorian brown coal Volatile–char interactions Kinetics Gasification kajitani, Shiro Tay, Hui-ling Zhang, Shu Li, Chun-Zhu Mechanisms and kinetic modelling of steam gasification of brown coal in the presence of volatile–char interactions |
| title | Mechanisms and kinetic modelling of steam gasification of brown coal in the presence of volatile–char interactions |
| title_full | Mechanisms and kinetic modelling of steam gasification of brown coal in the presence of volatile–char interactions |
| title_fullStr | Mechanisms and kinetic modelling of steam gasification of brown coal in the presence of volatile–char interactions |
| title_full_unstemmed | Mechanisms and kinetic modelling of steam gasification of brown coal in the presence of volatile–char interactions |
| title_short | Mechanisms and kinetic modelling of steam gasification of brown coal in the presence of volatile–char interactions |
| title_sort | mechanisms and kinetic modelling of steam gasification of brown coal in the presence of volatile–char interactions |
| topic | Victorian brown coal Volatile–char interactions Kinetics Gasification |
| url | http://hdl.handle.net/20.500.11937/44757 |