Effects of char chemical structure and AAEM retention in char during the gasification at 900 °C on the changes in low-temperature char-O<inf>2</inf> reactivity for Collie sub-bituminous coal
MetadataShow full item record
© 2017 Elsevier LtdThis study is focused on the effects of char structure and alkali and alkaline earth metallic (AAEM) species on the changes in char-O2 reactivity for a Western Australian Collie sub-bituminous coal. The char samples used in this study were acquired from the partial gasification of the sub-bituminous coal in a fluidised-bed/fixed-bed reactor in pure CO2, 15% H2O balanced with Ar and a mixture of 15% H2O and CO2 (balancing gas) at 900 °C. The structural features of the chars were characterised by FT-Raman spectroscopy. The concentrations of AAEM species in the chars were determined by inductively coupled plasma – optical emission spectroscopy. The O-containing structures in char that can cause resonance effects to give enhanced Raman intensity tend to improve the retention of AAEM species in char during the gasification at 900 °C. However, these O-containing structures do not necessarily ensue a high char-O2 reactivity at low temperature. While AAEM species in char would catalyse the char-O2 reactions, they are not sufficient to determine the char-O2 reactivity. The relative ratio of small to large aromatic ring systems in char, as reflected by the Raman spectroscopy, greatly influences the char-O2 reactivity. The sub-bituminous coal in this study does not behave in the same way as the brown coal in our previous studies in terms of the factors influencing the char-O2 reactivity.
Showing items related by title, author, creator and subject.
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 ...
Effects of gasification atmosphere and temperature on char structural evolution during the gasification of Collie sub-bituminous coalLi, Tingting; Zhang, Lei; Dong, Li; Li, Chun-Zhu (2014)Char structure is one of the important factors influencing the char reactivity during gasification. The purpose of this study is to investigate the effects of gasification atmosphere and temperature on the changes of char ...
Effects of gasification temperature and atmosphere on char structural evolution and AAEM retention during the gasification of Loy Yang brown coalLi, T.; Zhang, L.; Dong, Li; Zhang, S.; Qiu, P.; Wang, S.; Li, Chun-Zhu (2017)© 2017 Elsevier B.V.This study aims to investigate the influence of gasification temperature on the evolution of char structure and the retention of alkali and alkaline earth metallic (AAEM) species for a Victorian brown ...