泰钢串罐式高炉炉顶插入件设计优化

插入件通常安装在高炉料罐中以延长设备使用寿命,而料罐中安装插入件对料罐和炉喉内炉料粒度分布有重要影响。基于泰钢1 780 m3高炉串罐式无钟炉顶系统,建立等比例三维几何模型,分别在改变插入件安装高度和直径的条件下,对炉料从皮带运动至炉喉全过程进行离散单元仿真计算。统计结果表明,安装插入件使大粒径颗粒分布趋于料罐中心,小粒径颗粒分布在料罐壁面附近;下料罐卸料过程中,安装插入件使颗粒流动模式由"漏斗流"转变为"活塞流",缩小了炉喉径向平均粒径波动范围。当插入件安装在料罐下部锥形区域高度的1/2,且直径等于料罐出口直径时,炉喉中心区域平均粒径相对较大。对实际料罐插入件的设计与安装以及高炉生产具有重要指导意义。

Design optimization of insert in serial-hopper bell-less top system of Taisteel blast furnace

To prolong the service life of equipment， usually an insert is installed inside the hopper of the blast furnace， but the insert installed in the hopper has a great influence on the particle size distribution in the hopper and the throat. A full-scale 3D geometrical model was established， which based on the serial-hopper bell-less top system of the Taisteel 1 780 m3 blast furnace. Moreover， the motion of burden particles from the belt to the throat was simulated by the discrete element method at the condition of changing locations and diameters of the insert respectively. Statistical results showed that larger particles stayed near the center while small particles locate near the side wall when the insert is installed in the lower hopper. During the discharging progress of the lower hopper， the particle flow pattern ends to a plug flow compared with the funnel flow at the condition without the insert. Hence， the average diameter fluctuant range of particles decreases in radial direction of the stock surface. In addition， the average particle diameter is relatively larger in the central zone of throat when the insert diameter is equal to the diameter of outlet and the installation height of the insert is half of the height of the cone-shape zone in the lower part of hopper. Moreover， this study has important guidance on the design and installation of the insert and the production of blast furnaces.