沙钢高炉偏料技术研究和应用  

Research and application of circumferential imbalance in Shasteel blast furnace

作　　者：赵华涛 卢瑜 韩旭 杜屏 张国良 ZHAO Hua-tao;LU Yu;HAN Xu;DU Ping;ZHANG Guo-liang(Ironmaking and Environment Research Group,Institute of Research of Iron and Steel,Shasteel,Zhangjiagang 215625,Jiangsu,China;Ironmaking Plant,Jiangsu Shagang Group Co.,Ltd.,Zhangjiagang 215625,Jiangsu,China)

机构地区：[1]江苏省(沙钢)钢铁研究院铁前研究室,江苏张家港215625 [2]江苏省沙钢集团有限公司炼铁厂,江苏张家港215625

出　　处：《钢铁》2022年第9期49-56,共8页Iron and Steel

摘　　要：为了研究高炉圆周方向矿焦比(O/C)分布规律,解决沙钢倒罐过程中气流波动大的问题,开发了圆周方向质量分布数学模型,并基于5800 m~3高炉1∶15冷布料试验装置测量了不同料罐和炉料组合方式及溜槽旋转方向下炉料在圆周方向的质量分布,证实了数学模型的准确性。进一步计算高炉圆周方向矿焦比(O/C)分布的变化规律发现,对于炉顶料罐东西布置的高炉,倒罐主要降低东、西方向上的矿焦比偏析,而溜槽换向主要降低南、北方向上的矿焦比偏析,而且倒罐时矿焦比经历波峰到波谷的变化,幅度比换向时更大。操作者在生产过程中尝试倒罐时发现气流波动过大,易造成高炉压量关系紧张、指标下降,尤其在炉况不太稳定的时候。针对这种情况,基于圆周方向矿焦比分布模型分析了倒罐和溜槽换向前后矿焦比在各方向的变化,并制定了倒罐和溜槽换向相结合的优化方案,即倒罐的时候同时实施溜槽换向,从而减小倒罐时矿焦比变化过大造成的气流波动。沙钢3个2680 m~3高炉先后应用了倒罐和溜槽换向结合的技术,铁水质量得到改善,炉况稳定性提高,经济技术指标获得进步,炉顶设备故障率降低。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 5800 m~3 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 2680 m~3 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.

关 键 词：倒罐 溜槽换向 矿焦比 气流波动 铁水质量 

分 类 号：TF54[冶金工程—钢铁冶金]