Changes in char reactivity due to char-oxygen and char-steam reactions using victorian brown coal in a fixed-bed reactor
MetadataShow full item record
This study was to examine the influence of reactions of char–O2 and char–steam on the char reactivity evolution. A newly-designed fixed-bed reactor was used to conduct gasification experiments using Victorian brown coal at 800 °C. The chars prepared from the gasification experiments were then collected and subjected to reactivity characterisation (ex-situ reactivity) using TGA (thermogravimetric analyser) in air. The results indicate that the char reactivity from TGA was generally high when the char experienced intensive gasification reactions in 0.3% O2 in the fixed-bed reactor. The addition of steam into the gasification not only enhanced the char conversion significantly but also reduced the char reactivity dramatically. The curve shapes of the char reactivity with involvement of steam were very different from that with O2 gasification, implying the importance of gasifying agents to char properties.
Showing items related by title, author, creator and subject.
Volatilisation and catalytic effects of alkali and alkaline earth metallic species during the pyrolysis and gasification of Victorian brown coal. Part IX. Effects of volatile-char interactions on char–H2O and char–O2 reactivitiesZhang, Shu; Hayashi, J.; Li, Chun-Zhu (2011)Volatile-char interactions are an important consideration in the design and operation of a gasifier. This study aims to investigate the effects of volatile-char interactions on the in situ char–steam reactivity at 800 °C ...
Effects of gasifying agent on the evolution of char structure during the gasification of Victorian brown coalTay, Hui-ling; kajitani, Shiro; Zhang, Shu; Li, Chun-Zhu (2013)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 ...
Keown, D.; Hayashi, J.; Li, Chun-Zhu (2008)An Australian cane trash biomass was pyrolysed by heating at a slow heating rate to 700–900 °C in an inert gas atmosphere. The chars were then gasified in situ with steam. Our results indicate that the gasification of ...