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| THE MECHANISM OF HANGING IN THE BLAST FURNACE |
| YANG YUNG-YI;CHU CHING-KANG Peking Institute of Ferrous Metallurgy |
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Cite this article:
YANG YUNG-YI;CHU CHING-KANG Peking Institute of Ferrous Metallurgy. THE MECHANISM OF HANGING IN THE BLAST FURNACE. Acta Metall Sin, 1965, 8(2): 157-164.
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Abstract The modified Janssen formula, relating the pressure of the burden column and thecountercurrent gas flow, has been verified experimentally. However this formula can notexplain the mechanism of hanging. The authors proposed the following mechanism: Ifthere exists a layer of poor gas-permeability in the burden column and if the gas velocityis increased to exceed some critical value, then the pressure drop of the gas through thatlayer would become greater than the layer weight. Therefore a force acting upward fromthat layer is induced. When this force becomes equal to or greater than the pressureof the overlaying burden, hanging will take place in the blast furnace. Such hanging,however, never occurs in the fluidized bed with granular particles of uniform size anddensity. The suggested mechanism has been proven in a 1/50 laboratory model of the1513 m~3 blast furnace and has been compared with the results of the actual industrialperformance of various blast furnaces. From this mechanism the authors arrived at the conclusions that the physical pro-perties of the raw materials, especially the screen analysis and the viscosity of the slagin the melting zone, are of vital importance when the driving rate of the blast furnaceis to be increased and hanging avoided.
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Received: 18 February 1965
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[3] 朱景康:北京钢铁学院研究生论文,1963,p.2-3．
[4] Janssen, H. A.: Z. Verdins Deutscher Ing, 1895, 39, 1045．
[5] 克列因,Г.К.著,陈大鹏、王荣鋆、徐文焕等译:散体结构力学,(人民铁道出版社,1960年),236页.
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[8] Paschal, F., Himber, F.: Journees Internationales de Siderurgie, (Luxembourg, 1--4 Oct., 1962) , p. 69．N |
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