摘要
基于相似性原理,建立了按500 m3高炉1∶6比例缩小的180°无钟炉顶模型。利用该模型模拟了高炉炉喉料面的形成过程,并分析了不同布料制度下高炉径向料层分布的规律。结果表明,边缘平台是在相邻两档焦炭布料量差距较大时形成的,边缘平台越宽,在中心漏斗区加入矿石越多,高炉中心混合层越小,高炉中心气流环带越窄。各高炉根据原料条件和设备条件应有一个大小最优的混合层,混合层合适的宽度范围为15%~30%。不同布料制度下边缘平台区域和中间区域的径向气流速度分布和径向矿焦比分布存在比较好的对应关系。而在高炉混合层区域径向矿焦比均较小,此时径向气流速度分布与径向矿焦比关系不明显,但与径向粒度大小的关系较明显。在高炉次中心平均粒度较大,气流速度较大;高炉正中心平均粒度最小,气流速度也最小。
Based on the similarity principle,a 1/6 scale half-section,three-dimensional cold model of the 500 m3 blast furnace（ BF） without bell furnace top was built to simulate the formation of the burden surface in the blast furnace throat and to analyze the law of the radial burden distribution in the blast furnace under different charging patterns. The results showed that the edge terrace of burden surface was formed when the difference in the weight between the neighbor rings of cokes was great. The wider the edge terrace was,the more ore added to the central funnel zone was,the smaller the mixing layer at the center of the blast furnace was,and the narrower the central air flow of the blast furnace was. Each blast furnace should have an optimum width of mixing layer according to the raw material and equipment of the blast furnace,and the suitable width of the mixing layer was between 15% and 30%. The results also showed that the radial velocity distribution agreed well with the radial distribution of ratio of ore to coke in the edge platform area and the middle area under different charging patterns,while the radial distribution of ratio of ore to coke was small in the area of mixed layer of blast furnace and the influence of the radial distribution of ratio of ore to coke on the radial velocity distribution was not obvious. The influence of the radial particle size distribution on the radial velocity distribution was obvious that the average particle size of burden material was large in the neighbor region of the blast furnace center,so the velocity of gas in the throat was large accordingly; and that the average particle size of burden material in the center of the blast furnace wasthe smallest,so the velocity of gas in the throat was the smallest correspondingly.
作者
卢瑜
张明星
赵华涛
杜屏
Lu Yu;Zhang Mingxing;Zhao Huatao;Du Ping(Institute of Researeh of Iron and Steel of Shasteel, Zhangjiagang Jiangsu 215625, China)
出处
《上海金属》
CAS
北大核心
2018年第3期84-89,94,共7页
Shanghai Metals
关键词
无钟炉顶
高炉布料
物理模拟
混合层
bell-less furnace
burden distribution of blast thrnaee
physical simulation
mixing layer
