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    Effect of heating rate on migration and transformation of N during pyrolysis of Shengli brown coal

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    Authors
    Zhang, Shu
    Bai, Y.
    Mi, L.
    Zheng, P.
    Chen, X.
    Xu, D.
    Wang, Y.
    Date
    2013
    Type
    Journal Article
    
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    Citation
    Zhang, S. and Bai, Y. and Mi, L. and Zheng, P. and Chen, X. and Xu, D. and Wang, Y. 2013. Effect of heating rate on migration and transformation of N during pyrolysis of Shengli brown coal. Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology. 41 (10): pp. 1153-1159.
    Source Title
    Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology
    ISSN
    0253-2409
    School
    Fuels and Energy Technology Institute
    URI
    http://hdl.handle.net/20.500.11937/55447
    Collection
    • Curtin Research Publications
    Abstract

    The effects of heating rate on migration, transformation and occurring forms of nitrogen during pyrolysis of Shengli brown coals were studied in a fixed-bed/fluidised-bed quartz reactor. The results indicate that the yields of NH 3 and HCN from the fast pyrolysis were much higher than those from the slow pyrolysis. The difference in the yields of NH 3 and HCN between the fast and slow heating rates increases with the increasing pyrolysis temperature. The maximum productions of NH 3 and HCN mostly occur at 973 K, which is attributed to the enhanced condensation and secondary reactions with the increasing pyrolysis temperature. The release rate of char-N is faster than the weight loss rate of char itself at fast heating rate. The results from X-ray photoelectron spectroscopy (XPS) analysis imply that the pyrolysis process has facilitated the transformation of pyrrolic (N-5) to quaternary type nitrogen (N-Q) and pyridinic (N-6). It seems that the fast heating rate favors the formation of N-6 while the content of N-Q in char is relatively high at the slow heating rate.

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