Formation of nascent char structure during the fast pyrolysis of mallee wood and low-rank coals
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The structural evolution of nascent chars during the fast pyrolysis of a wood and two low-rank coals was investigated in this study. Western Australian Collie sub-bituminous coal, Victorian Loy Yang brown coal and Western Australian mallee wood were pyrolysed in a wire-mesh reactor that is capable of providing rapid heating rates (up to 5000 K s−1) and accurate holding time (in increments of 10 ms) at peak temperature. FT-Raman spectroscopy was used to characterise the key structural features of raw fuels and nascent chars. The combined use of a wire-mesh reactor and a FT-Raman spectroscopy has given insights into the structural transformation from coal/biomass to nascent chars. There were insignificant changes in the aromatic ring systems of two coals during the initial fast heating from room temperature to 600 °C. During holding at 600 °C, the changes that occurred in ring systems for the three fuels were different. Mallee wood and Loy Yang coal underwent more changes than Collie coal. In addition, mallee wood had ring condensation during holding at 600 °C up to 30s. However, little growth in large aromatic rings of two coals was observed during holding at 600 °C up to 50 s.
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Structural transformation of nascent char during the fast pyrolysis of mallee wood and low-rank coalsZhang, L.; Li, T.; Quyn, D.; Dong, Li; Qiu, P.; Li, Chun-Zhu (2015)The changes in char structure during the fast pyrolysis of three different feedstocks from 600 °C to 1200 °C were investigated. Western Australian Collie sub-bituminous coal, Victorian Loy Yang brown coal and Australian ...
Changes in char structure during the thermal treatment of nascent chars in N<inf>2</inf> and subsequent gasification in O<inf>2</inf>Zhang, L.; Li, T.; Wang, Shuai; Song, Y.; Dong, Li; Zhang, Shu; Li, Chun-Zhu (2017)© 2017 Elsevier LtdThis study aims to investigate the structural features of nascent char. Two nascent chars were prepared from the pyrolysis of Loy Yang brown coal and Collie sub-bituminous coal in a wire-mesh reactor ...
Zhang, L.; Kajitani, S.; Umemoto, S.; Wang, S.; Quyn, D.; Song, Y.; Li, T.; Zhang, S.; Dong, L.; Li, Chun-Zhu (2015)The purpose of this study is to investigate the structural changes in nascent chars during the gasification of two low-rank coals in CO2 at 1000 °C and 1200 °C. Western Australian Collie sub-bituminous coal and Victorian ...