Effects of gasifying agent on the evolution of char structure during the gasification of Victorian brown coal
Steam plays a vital role in the gasification process. This study aims to investigate the changes in charstructure and reactivity during the gasification of Victorian brown coal. A Loy Yang brown coal samplewas gasified at 800 C in a novel fluidised-bed/fixed-bed reactor in three different gasificati...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Published: |
Elsevier Science Ltd
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/7125 |
| _version_ | 1848745276223782912 |
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| author | Tay, Hui-ling kajitani, Shiro Zhang, Shu Li, Chun-Zhu |
| author_facet | Tay, Hui-ling kajitani, Shiro Zhang, Shu Li, Chun-Zhu |
| author_sort | Tay, Hui-ling |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Steam plays a vital role in the gasification process. This study aims to investigate the changes in charstructure and reactivity during the gasification of Victorian brown coal. A Loy Yang brown coal samplewas gasified at 800 C in a novel fluidised-bed/fixed-bed reactor in three different gasification atmospheres: 15% H2O balanced with argon, 4000 ppm O2 balanced with CO2 and 4000 ppm O2 + 15% H2O balanced with CO2. The intrinsic reactivities of chars with air were measured with a thermogravimetric analyser (TGA) at low temperatures (380 or 400 C). The char structural features were characterised using FT-Raman spectroscopy followed by spectral deconvolution. Our results indicate that steam, when it is present in the gasifying atmosphere, has a drastic effect on char structure and the subsequent reactivity of char with air at low temperatures. The presence of steam during the gasification at 800 C also impacts on the volatilisation of Mg and Ca by altering the char structure. Our data provide evidence that the char–H2O gasification follows a different reaction pathway from the char–CO2 gasification, at least for the gasification of Victorian brown coal under the current experimental conditions. |
| first_indexed | 2025-11-14T06:14:47Z |
| format | Journal Article |
| id | curtin-20.500.11937-7125 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:14:47Z |
| publishDate | 2013 |
| publisher | Elsevier Science Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-71252017-02-28T01:30:06Z Effects of gasifying agent on the evolution of char structure during the gasification of Victorian brown coal Tay, Hui-ling kajitani, Shiro Zhang, Shu Li, Chun-Zhu Char structure Victorian brown coal Char reactivity Gasification Steam plays a vital role in the gasification process. This study aims to investigate the changes in charstructure and reactivity during the gasification of Victorian brown coal. A Loy Yang brown coal samplewas gasified at 800 C in a novel fluidised-bed/fixed-bed reactor in three different gasification atmospheres: 15% H2O balanced with argon, 4000 ppm O2 balanced with CO2 and 4000 ppm O2 + 15% H2O balanced with CO2. The intrinsic reactivities of chars with air were measured with a thermogravimetric analyser (TGA) at low temperatures (380 or 400 C). The char structural features were characterised using FT-Raman spectroscopy followed by spectral deconvolution. Our results indicate that steam, when it is present in the gasifying atmosphere, has a drastic effect on char structure and the subsequent reactivity of char with air at low temperatures. The presence of steam during the gasification at 800 C also impacts on the volatilisation of Mg and Ca by altering the char structure. Our data provide evidence that the char–H2O gasification follows a different reaction pathway from the char–CO2 gasification, at least for the gasification of Victorian brown coal under the current experimental conditions. 2013 Journal Article http://hdl.handle.net/20.500.11937/7125 Elsevier Science Ltd restricted |
| spellingShingle | Char structure Victorian brown coal Char reactivity Gasification Tay, Hui-ling kajitani, Shiro Zhang, Shu Li, Chun-Zhu Effects of gasifying agent on the evolution of char structure during the gasification of Victorian brown coal |
| title | Effects of gasifying agent on the evolution of char structure during the gasification of Victorian brown coal |
| title_full | Effects of gasifying agent on the evolution of char structure during the gasification of Victorian brown coal |
| title_fullStr | Effects of gasifying agent on the evolution of char structure during the gasification of Victorian brown coal |
| title_full_unstemmed | Effects of gasifying agent on the evolution of char structure during the gasification of Victorian brown coal |
| title_short | Effects of gasifying agent on the evolution of char structure during the gasification of Victorian brown coal |
| title_sort | effects of gasifying agent on the evolution of char structure during the gasification of victorian brown coal |
| topic | Char structure Victorian brown coal Char reactivity Gasification |
| url | http://hdl.handle.net/20.500.11937/7125 |