Dynamics of Burden Materials and Gas Flow in the Blast Furnace

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  • 冷間模型による高炉内装入物の力学的挙動とガス通気性の検討
  • レイカン モケイ ニヨル コウロナイ ソウニュウブツ ノ リキガクテキ キョド

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Abstract

Descending behavior of burden materials and distribution of stresses in the blast furnace were studied by the use of a reduced-scale model.<BR>Appearance of burden descent is, macroscopically, like a plug flow at upper part of the belly and a funnel flow at the bosh. However, at the peripheral region close to the wall, a mixed zone of are and coke is formed and its dimension depends on the shaft angle and the shape factor of burden.<BR>Stress field is an active state in the shaft and is a passive state in the bosh. At the belly in a transitional state, the horizontal stress develops markedly.<BR>Particles flow into the raceway passing through a narrow part above the tuyere nose. A profile of dead coke zone estimated by a theoretical consideration of the stress field of passive state shows a good agreement with the experimental results.<BR>The gas permeability of a moving bed with a funnel flow is higher than that of fixed bed because of the increase in void fraction.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 68 (8), 936-945, 1982

    The Iron and Steel Institute of Japan

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