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| Activity index and improvement measure of BF hearth |
| CHEN Chuan，AN Gang |
| （Ironmaking Plant， Shougang Jingtang United Iron and Steel Co.， Ltd.， Tangshan 063200， Hebei， China） |
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Abstract With the increasing of smelting intensity， more and more attention has been paid to the activity of BF hearth by the operators. In order to reasonably evaluate the hearth activity and guide the blast furnace production，the influencing factors of the hearth activity were analyzed quantitatively by the definition of activity index of BF hearth. Meanwhile， main measures were put forward to improve hearth activity according to smelting practice. The results indicate that the influencing factors of hearth activity include the intrinsic property of stock column and physical characteristics. The hearth activity can be improved by enhancing the coke size and void ratio and decreasing slag viscosity. During smelting process， the blast volume， hot metal temperature， pulverized coal injection and alkali load must be optimized in order to enhance the coke update rate and reduce the coke degradation， which can improve the hearth activity.
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Received: 31 May 2017
Published: 05 February 2018
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2018, Vol. 53 
