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    NH3 and HCN formation during the gasification of three rank-ordered coals in steam and oxygen

    Access Status
    Fulltext not available
    Authors
    McKenzie, L.
    Tian, F.
    Guo, X.
    Li, Chun-Zhu
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    McKenzie, L. and Tian, F. and Guo, X. and Li, C. 2008. NH3 and HCN formation during the gasification of three rank-ordered coals in steam and oxygen. Fuel. 87 (7): pp. 1102-1107.
    Source Title
    Fuel
    DOI
    10.1016/j.fuel.2007.07.004
    ISSN
    0016-2361
    URI
    http://hdl.handle.net/20.500.11937/4762
    Collection
    • Curtin Research Publications
    Abstract

    A Victorian brown coal (68.5% C), a Chinese high-volatile Shenmu bituminous coal (82.3% C) and a Chinese low-volatile Dongshan bituminous coal (90% C) were gasified in a fluidised-bed/fixed-bed reactor at 800 °C in atmospheres containing 15% H2O, 2000 ppm O2 or 15% H2O + 2000 ppm O2. While the gasification of these coals in 2000 ppm O2 converted less than 27% of coal-N into NH3, the introduction of steam played a vital role in converting a large proportion of coal-N into NH3 by providing H on char surface. The importance of the roles of steam in the formation of NH3 in atmospheres containing 15% H2O + 2000 ppm O2 decreased with increasing coal rank. This is largely due to the slow gasification of high-rank coal chars, resulting in low availability of H on char surface. The gasification of chars from the high-rank coal appears to produce higher yields of HCN than that of lower rank coals, probably as a result of the decomposition of partially hydrogenated/broken/activated char-N structures during gasification at high temperature. The alkali and alkaline earth metallic species in brown coal tend to favour the release of coal-N as tar-N but have limited effects on char-N conversion during gasification.

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