Experimental Investigation of Expansion during Formation Process of Formed Coke Blending with Torrefied Biomass

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  • Matsukawa Yoshiya
    Department of Chemical Engineering, Graduate School of Engineering, Tohoku University
  • Hirayama Wakana
    Department of Chemical Engineering, Graduate School of Engineering, Tohoku University
  • Hayashi Jun-ichiro
    Institute for Materials Chemistry and Engineering, Kyushu University
  • Aoki Hideyuki
    Department of Chemical Engineering, Graduate School of Engineering, Tohoku University
  • Matsui Takashi
    Steel Research Laboratory, JFE Steel Corporation

Abstract

<p>The mechanisms of expansion and shrinkage behavior of the briquettes of coal or torrefied biomass were investigated by measuring the weight loss of coal and torrefied biomass and the expansion and shrinkage of the briquettes. In the case of torrefied biomass, particularly large expansion occurred at temperatures below 600°C. In the case of hot briquetting, the expansion was small below the briquetting temperature, suggesting that the expansion originated from relaxation of residual stresses during briquetting process. When coal and biomass were blended, the maximum strain was slightly close to the briquette of coal, and the temperature at which the maximum strain was taken was almost the same as that of the briquette of torrefied biomass, and in both cases, additivity was not valid. The expansion and shrinkage behavior of the briquettes was modeled as thermal expansion unique to the material, expansion due to relaxation of stresses accumulated during molding, and shrinkage due to the release of volatiles.</p>

Journal

  • ISIJ International

    ISIJ International 63 (9), 1557-1566, 2023-09-15

    The Iron and Steel Institute of Japan

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