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    In-Situ Reforming of Tar from the Rapid Pyrolysis of a Brown Coal over Char

    Access Status
    Fulltext not available
    Authors
    Matsuhara, T.
    Hosokai, S.
    Norinaga, K.
    Matsuoka, K.
    Li, Chun-Zhu
    Hayashi, J.
    Date
    2010
    Type
    Journal Article
    
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    Citation
    Matsuhara, Toru and Hosokai, Sou and Norinaga, Koyo and Matsuoka, Koichi and Li, Chun-Zhu and Hayashi, Jun-ichiro. 2010. In-Situ Reforming of Tar from the Rapid Pyrolysis of a Brown Coal over Char. Energy & Fuels. 24 (1): pp. 76-83.
    Source Title
    Energy & Fuels
    DOI
    10.1021/ef9005109
    ISSN
    08870624
    School
    Curtin Centre for Advanced Energy Science and Engineering
    URI
    http://hdl.handle.net/20.500.11937/47733
    Collection
    • Curtin Research Publications
    Abstract

    Reforming of nascent tar from the rapid pyrolysis of a brown coal over char prepared from the same coal was studied at 750−900 °C. The reforming was very rapid and extensive, allowing only benzene (0.02% on a coal C basis), naphthalene (0.001%), and phenanthrene (0.0001%) to escape from the char bed at an empty-bed gas residence time of less than 170 ms and 900 °C, respectively. Reforming even at 750 °C converted 96% of heavy tar (boiling point temperature >336 °C) into noncondensable gases and coke deposit over the char. Decreasing conversion of the tar into coke with increasing temperature suggested that the tar was reformed in a sequence of coking and steam gasification of the coke rather than direct steam reforming over the char. The reforming at 900 °C gave a negative coke yield due to progress of coke/char gasification faster than the coke deposition. Results of this work thus showed a possibility of complete tar reforming by intensification of contact between the char and volatiles even in the absence of a catalyst.

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