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    Influence of demineralization using acid wash on N migration and transformation during pyrolysis of Shengli brown coal

    Access Status
    Fulltext not available
    Authors
    Wang, Y.
    Zheng, P.
    Yang, S.
    Zhang, Shu
    Bai, Y.
    Jia, X.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Wang, Y. and Zheng, P. and Yang, S. and Zhang, S. and Bai, Y. and Jia, X. 2014. Influence of demineralization using acid wash on N migration and transformation during pyrolysis of Shengli brown coal. Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology. 42 (5): pp. 519-526.
    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/20.500.11937/56342
    Collection
    • Curtin Research Publications
    Abstract

    This paper is to examine effects of inherent minerals in coal on N migration and transformation during the fast pyrolysis of Shengli brown coal at the temperatures of 773~1173 K in a bench-scale fluidized-bed quartz reactor. Based on the comparison between raw coal and acid-washed coal, we can find that the alkali Na and alkaline Ca were the key reasons for the difference in N evolutions from raw coal and demineralized coal during the pyrolysis. The Na and Ca could efficiently facilitate the formation of NH 3 and inhibit the production of HCN. The metallic species had obvious catalytic effects for the conversion from tar-N to NH 3 . Meantime, the existence of alkali and alkaline metals has enhanced the cracking reactions of coal char, thus reducing the yields of char and char-N. In addition, the relative amount of pyridinic (N-6) in demineralized coal char was higher than that in raw coal, while less quternary type nitrogen (N-Q) and pyrrolic nitrogen (N-5) were found in the demineralized coal char.

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