加圧下における石炭の急速熱分解機構  [in Japanese] Mechanism of Coal-Pyrolysis under Elevated Pressure and Rapid Heating Conditions  [in Japanese]

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Author(s)

Abstract

The coal-pyrolysis experiment under elevated pressure conditions using a pressurized ther-mobalance has been carried out to clarify the mechanisms and the processes at conditions changing from normal pressure to higher pressure (10.6 ata) and from slow (0.1 K/s) to rapid heating rate (20 K/s). Simultaneously, a new pyrolysis model which can describe a pressure effect on the evolution behavior has been developed based on the FLASHCHAIN^[○!R] model including a quantitative estimation of the volatilized gases and released tar vapor. From the experiment, the tar vapor formation is suppressed and the yields of CH_4 gas shows increasing behavior at higher pressure conditions. Because the mole fraction of tar vapor decreased with the increase of the pressure by Raoult's law, and the recombination reactions of remaining metaplast (precursor of tar) within the coal are activated, resulting in more chars and more gas yields (CH_4, CO_2). At rapid heating rate conditions, the conversion from the metaplast to the volatile matter would be more active, because the reaction temperature range for thermal pyrolysis shifts to higher range with increase of heating rate. It was found that the rapid heating rate affects the molecular structure of the coal substantially.

Journal

  • Transactions of the Japan Society of Mechanical Engineers. Series B.

    Transactions of the Japan Society of Mechanical Engineers. Series B. 71(702), 702-710, 2005-02-25

    The Japan Society of Mechanical Engineers

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Codes

  • NII Article ID (NAID)
    110005051456
  • NII NACSIS-CAT ID (NCID)
    AN00187441
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03875016
  • NDL Article ID
    7267498
  • NDL Source Classification
    ZN11(科学技術--機械工学・工業)
  • NDL Call No.
    Z16-109
  • Data Source
    CJP  CJPref  NDL  NII-ELS 
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