Optimum Coke-free Space Volume in Blast Furnace Hearth by Wall Shear Stress Analysis

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Conservation equations of mass and momentum are solved numerically in an actual plant size hearth to determine the wall shear stress at various operating conditions. The effect of different coke-bed shape and position was studied on the wall shear stress of the hearth. It was found that there exists an optimum coke-free space volume for all kinds of coke-bed shapes with respect to shear stresses on the sidewall as well as on the hearth bottom. It was found that conical coke-bed with a sitting position could induce more wall shear stress on the side wall if the coke-free space volume was limited to about 48 m<sup>3</sup> and if the free space increased beyond 48 m<sup>3</sup> then the spherical coke-bed in a floating condition induced maximum stress on the wall where as all other coke-bed shapes studied were benign to the stress on the wall. Conical coke-bed shape is more vulnerable, in terms of producing more stress on the hearth bottom than any other shapes.

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  • ISIJ international  

    ISIJ international 46(10), 1396-1402, 2006-10-15 

    The Iron and Steel Institute of Japan

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