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| Research and application of circumferential imbalance in Shasteel blast furnace |
| ZHAO Hua-tao1, LU Yu1, HAN Xu1, DU Ping1, ZHANG Guo-liang2 |
1. Ironmaking and Environment Research Group, Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, Jiangsu, China;
2. Ironmaking Plant, Jiangsu Shagang Group Co., Ltd., Zhangjiagang 215625, Jiangsu, China |
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Abstract In order to study the circumferential imbalance of O/C distribution in blast furnace and to minimize the gas fluctuation during the bunker change, a mathematical model on mass distribution in circumferential direction of blast furnace was developed. The mass distribution of burden material under different bunker-material combinations and different chute rotating directions was measured with a cold charging model which was built based on 1∶15 of the 5 800 m3 blast furnace, verifying the mathematical model. As a further step, the O/C distribution change pattern in circumferential direction was computed under different bunker-material combinations and chute rotating directions. It is revealed that change of bunker-material combination mainly reduces the deviation of O/C in east-west direction, while change of chute rotating direction mainly reduces the deviation of O/C in south-north direction for the blast furnace equipped with two bunkers in east-west direction. It also shows that the maximum O/C difference in circumferential direction during alteration of bunker-material combination is much bigger than the maximum O/C difference during alteration of chute direction. However, during the actual blast furnace operation, when the bunker change is being done, the gas distribution change is rather violent, causing high pressure drop, especially when the blast furnace condition is not stable. To overcome this problem, the O/C difference in each direction was calculated at different bunker-material combinations and chute rotating directions, and a combination of bunker change and chute rotating direction change was formulated to minimize the gas fluctuation during the bunker change. Three 2 680 m3 blast furnaces in Shasteel adopted this method and succeeded in improvement of hot metal quality, operational stability and technical index, as well as the reduction of equipment malfunction.
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Received: 14 February 2022
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2022, Vol. 57 
