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    Effects of CO2 and heating rate on the characteristics of chars prepared in CO2 and N2 atmospheres

    Access Status
    Fulltext not available
    Authors
    Su, S.
    Song, Y.
    Wang, Y.
    Li, T.
    Hu, S.
    Xiang, J.
    Li, Chun-Zhu
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Su, S. and Song, Y. and Wang, Y. and Li, T. and Hu, S. and Xiang, J. and Li, C. 2015. Effects of CO2 and heating rate on the characteristics of chars prepared in CO2 and N2 atmospheres. Fuel. 142: pp. 243-249.
    Source Title
    Fuel
    DOI
    10.1016/j.fuel.2014.11.025
    ISSN
    0016-2361
    School
    Fuels and Energy Technology Institute
    URI
    http://hdl.handle.net/20.500.11937/12837
    Collection
    • Curtin Research Publications
    Abstract

    This paper reports an experimental study to assess the effects of CO2 and heating rate on the characteristics of the chars formed in CO2 and N2 atmospheres in the initial stage of oxy-fuel combustion. The chars of a Chinese bituminous coal were prepared in a fluidised-bed/fixed-bed reactor at 900°C and their chemical structural features were further characterised with FT-Raman spectroscopy. Our results indicate that changes in CO2 concentration influence not only the char yield but also the char chemical structural features, which become more condensed and increasingly oxygenated with increasing CO2 concentration. The chars formed in CO2 atmosphere at fast heating rates are less condensed but more oxygenated than those formed at a slow heating rate. The O-holding capacity of the fast heating char decreases with the aromatic condensation as the char is held in CO2 atmosphere at 900°C.

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