Simplified Method to Estimate f(E) in Distributed Activation Energy Model for Analyzing Coal Pyrolysis Reaction

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Recently one of the authors has presented a method (method I) to estimate both the distribution curve of the activation energy, <I>f</I>(<I>E</I>), and the frequency factor, <I>k</I><SUB>0</SUB>, in the so called distributed activation energy model (DAEM) from three sets of experimental data obtained at different heating rates. No <I>a priori</I> assumptions are made for the functional forms of <I>f</I>(<I>E</I>) and <I>k</I><SUB>0</SUB>. The <I>k</I><SUB>0</SUB> vs. <I>E</I> relationships obtained by this method for pyrolysis of 19 coals are found to be grouped into three groups, depending on coal rank. Utilizing the result, a simple method (method II) for estimating the <I>f</I>(<I>E</I>) curve is presented for analyzing the pyrolysis reaction of coal. The <I>k</I><SUB>0</SUB> vs. <I>E</I> relationship can be converted to the relationship between <I>E</I> and temperature, <I>T</I>, for a selected constant heating rate, <I>a</I>. Establishing the <I>E</I> vs. <I>T</I> relationship, we can easily estimate the <I>f</I>(<I>E</I>) curve from a single weight loss curve measured at the heating rate of <I>a</I>. The <I>f</I>(<I>E</I>) curve obtained by the simple method is rather close to the <I>f</I>(<I>E</I>) curve estimated by method I. The difference of the peak <I>E</I> values of <I>f</I>(<I>E</I>) curves estimated by both methods is always less then 15 kJ/mol. The <I>f</I>(<I>E</I>) curve estimated by the simple method is utilized well for predicting the weight change under different heating profiles.

収録刊行物

  • Journal of chemical engineering of Japan  

    Journal of chemical engineering of Japan 31(2), 228-235, 1998-04 

    The Society of Chemical Engineers, Japan

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各種コード

  • NII論文ID(NAID)
    10002065224
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • NDL 記事登録ID
    4483633
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z53-R395
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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