Measurement of Heat Transfer Rate between Particle and Fluid in Counter-current Moving Beds

DOI Web Site Web Site 8 Citations 7 References
  • AKIYAMA Tomohiro
    Research Institute of Mineral Dressing and Metallurgy, Tohoku University
  • TAKAHASHI Reijiro
    Research Institute of Mineral Dressing and Metallurgy, Tohoku University
  • YAGI Jun-ichiro
    Research Institute of Mineral Dressing and Metallurgy, Tohoku University

Bibliographic Information

Other Title
  • 向流式移動層における粒子流体間伝熱速度の測定
  • コウリュウシキ イドウソウ ニ オケル リュウシ リュウタイカン デンネツ ソ

Search this article

Abstract

For heat transfer between particles and fluid stream in industrial moving beds like as blast furnace and shaft furnace for direct reduction, the significant discrepancy has been reported between actual heat transfer rate and that estimated by empirical correlations.<BR>Three modes of steady-state heat transfer experiments have been carried out between nitrogen stream and hematite pellets in a laboratory scale counter-current moving bed reactor. Longitudinal distribution of both pellet and gas temperatures were measured by sheathed thermocouples inserted at the center of the pellet and protruded from inner wall by 5 mm, respectively. In the measurements, thermal gradient was not found within the pellet because of Bi<0.15 where Bi is Biot number. Heat loss through the wall of the bed was also measured by a heat flow meter.<BR>The observed results have been correlated in terms of Nusselt, Reynolds and Prandtl numbers to give :<BR>Nu= 2.0 + 0.39 Pr1/3Rep1/2 (150<Rep<400)<BR>The coefficient 0.39 obtained here is considerably small compared with those of reported correlations.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 76 (6), 848-855, 1990

    The Iron and Steel Institute of Japan

Citations (8)*help

See more

References(7)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top