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dc.contributor.authorTay, Hui-ling
dc.contributor.authorkajitani, Shiro
dc.contributor.authorZhang, Shu
dc.contributor.authorLi, Chun-Zhu
dc.identifier.citationTay, H. and kajitani, S. and Zhang, S. and Li, C. 2013. Effects of gasifying agent on the evolution of char structure during the gasification of Victorian brown coal. Fuel. 103: pp. 22-28.

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.

dc.publisherElsevier Science Ltd
dc.subjectChar structure
dc.subjectVictorian brown coal
dc.subjectChar reactivity
dc.titleEffects of gasifying agent on the evolution of char structure during the gasification of Victorian brown coal
dc.typeJournal Article
curtin.departmentDepartment of Chemical Engineering
curtin.accessStatusFulltext not available

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