Influence of Screw Design on Burden Descending Velocity and Particle Segregation in COREX Shaft Furnace  

作　　者：Hai-feng LI Heng ZHOU Tao ZHANG Yang YOU Zong-shu ZOU Wan-ren XU 

机构地区：[1]School of Metallurgy,Northeastern University [2]Baoshan Iron and Steel Co.,Ltd.

出　　处：《Journal of Iron and Steel Research International》2016年第6期516-524,共9页

基　　金：Item Sponsored by National Key Technology Research and Development Program during 12th Five-year Plan of China(2011BAE04B02);National Natural Science Foundation of China(51174053)

摘　　要：COREX shaft furnace（SF）is an industrial system that employs screw feeders;thus,the burden descending velocity and particle segregation in the SF can be directly affected by the design of screw.A three-dimensional actual size model of COREX-3000 SF was established using the discrete element method.Four types of burdens,including pellet,ore,flux and coke,were considered in this model.With this consideration,the effect of screw design on solid flow was investigated.Results showed that,in the base case,burdens fell primarily down from the first flight of the screw.The burden descending velocities were nearly uniform in the peripheral direction and decreased along the radial direction.In addition,the normalized particle size increased in the center area and decreased in the wall area.Reducing the flight diameter of screw benefited an even flow pattern and restrained the rolling tendency of burden from the edge to center areas.An optimized case was also proposed,in which a uniform solid flow profile could be obtained and the evenness of descending velocity along the radius could be greatly improved.COREX shaft furnace（SF）is an industrial system that employs screw feeders;thus,the burden descending velocity and particle segregation in the SF can be directly affected by the design of screw.A three-dimensional actual size model of COREX-3000 SF was established using the discrete element method.Four types of burdens,including pellet,ore,flux and coke,were considered in this model.With this consideration,the effect of screw design on solid flow was investigated.Results showed that,in the base case,burdens fell primarily down from the first flight of the screw.The burden descending velocities were nearly uniform in the peripheral direction and decreased along the radial direction.In addition,the normalized particle size increased in the center area and decreased in the wall area.Reducing the flight diameter of screw benefited an even flow pattern and restrained the rolling tendency of burden from the edge to center areas.An optimized case was also proposed,in which a uniform solid flow profile could be obtained and the evenness of descending velocity along the radius could be greatly improved.

关 键 词：screw COREX descending burden normalized radius Velocity segregation torque pellet 

分 类 号：TF557[冶金工程—钢铁冶金]