Study on Hearth Activity Characterized By Slag-Iron Retention in BF Hearth
a novel model to characterize hearth activity based on the retention rate/amount of slag-iron in BF is proposed to cope with unclear presentation of hearth activity characterization given both at home and abroad,so as to quantitatively ana-lyze the influence of various BF operating parameters on hearth activity and figure out the solution to improve hearth activity.The findings reveal:(1)the influence priority of slag-iron-coke physical property on slag-iron retention rate is:hot metal temperature＞CSR＞coke particle size＞CRI＞slag alkalinity;(2)regarding less of the influence of retention rate on the retention amount,the influence priority of BF operating parameters on the slag-iron retention amount ranks as blast flowrate＞taphole depth＞blast temperature＞injected coal flowrate＞oxygen flowrate;(3)some technologies are effective in the production to regulate the active state of the furnace hearth,for instance,the technologies of raw fuel grading and perform-ance control,high blasting speed and high kinetic energy operation,slag and iron flow control,and slag and iron discharge control.
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