Effects of Measuring Method on the Effective Thermal Diffusivity of Packed Coal Column during Carbonization

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  • 乾留過程における石炭層の有効熱拡散率に及ぼす測定法の影響
  • カンリュウ カテイ ニ オケル セキ タンソウ ノ ユウコウ ネツ カクサンリ

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Abstract

The effective thermal diffusivity(κeff) of pulverized coal is measured by two different methods;one is "continuous heating method", and the other is "modified periodic heating method" in which the continuous heating is overlaid with periodic heating. Results with each method are similar in the temperature lower than about 750K. Above 750K, the temperature dependency on κeff is different at each method. The estimation is made on the measurement errors based on the temperature dependency of thermal properties, the heating rate and the endothermic reaction by numerical calculation. It is found that κeff is measured with high accuracy by modified periodic heating method. κeff is characterized in three temperature regions between 400 and 1 100K; in the first region, κeff is constant, in the second, κeff increases rapidly with temperature and in the third, κeff increases slowly.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 70 (3), 336-342, 1984

    The Iron and Steel Institute of Japan

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