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    Comparison of NO x reduction among different coal combustion methods and the application of decoupling combustion

    Access Status
    Fulltext not available
    Authors
    Shang, X.
    Gao, S.
    Wang, Y.
    Dong, Li
    Xu, G.
    Guo, J.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Shang, X. and Gao, S. and Wang, Y. and Dong, L. and Xu, G. and Guo, J. 2012. Comparison of NO x reduction among different coal combustion methods and the application of decoupling combustion. Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology. 40 (6): pp. 672-679.
    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/20.500.11937/56030
    Collection
    • Curtin Research Publications
    Abstract

    The reduction of NO x emission via different coal combustion methods was studied in a two-stage reactor using 3 different coals. The NO x formation is effectively suppressed by reburning the gas from pyrolysis and partial gasification of coal, making the NO x emission obviously lower than that of the air-staged combustion. It is found that the decoupling combustion leads to the higher NO x reduction rate, which is over 32% in comparison with the normal combustion. The NO x reduction rates vary with the coal properties. The smaller the fuel ratio (fixed carbon to volatile matter)at per nitrogen content in coal, the lower NO x emission is for reburning the combustible gas from pyrolysis and gasification and also for the decoupling combustion. The NO x emission due to reburning the partial gasification gas varies with the oxygen amount applied in the gasification, and the lowest NO x emission is realized in the oxygen concentration from 8% to 10%. A 1.4 MW industrial boiler was designed according to the principle of the decoupling combustion technology. The running data for the same coal show that the decoupling combustion reduces 32.9% NO x emission in comparison with the traditional combustion.

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