基于DEM的无钟高炉布料料流轨迹研究

摘要：离散单元仿真技术被广泛用于研究高炉布料过程中炉料运动的规律，其计算散料运动的方法得到了国内外专家的认可。利用SOLIDWORKS和EDEM的Geometry建立无钟炉顶高炉几何模型，基于DEM结合炉料物理参数进行数学模拟，研究了溜槽倾角、料线深度和溜槽结构对料流轨迹的影响。结果表明：焦炭落点半径随溜槽倾角的增大而增大，倾角为13.3°时，炉料在下落过程中不与溜槽接触；随着料线深度的增大，焦炭的落点半径随之增大，但增量减小；在相同倾角下，矩形溜槽布焦炭时的落点半径比半圆形溜槽的小0.3m，且料流更集中，布料效果略优；有衬板溜槽比光面溜槽布焦炭时的落点半径小0.13m，料流宽度也较小，且能通过料与料之间的摩擦降低炉料对溜槽表面的磨损。

Study on material flow trajectory with DEM for bell-less top charging of blast furnace

Discrete element simulation technology is widely used to study the law of burden movement in the charging process of blast furnace, and its method of calculating bulk material movement has been recognized by domestic and foreign experts. SOLIDWORKS and EDEM′s Geometry were used to establish the geometric models for the charging system of a bell less top blast furnace, and numerical simulations were conducted with DEM physical properties of charging materials. The influences of the inclination angle of chute, the depth of stock line, and the structure of chute on the movement trajectory of the charge particles were studied. The results show that the radius of the coke landing point increases with the increase of the inclination angle of the chute. When the inclination angle is 13.3°, the burden does not contact the chute during the falling process. As the depth of the stock line increases, the radius of the coke landing position also increases, but the increment decreases. Under the same inclination angle, the radius of landing position of the rectangular chute is 0.3m smaller than that of the semi circular chute, the material flow is more concentrated, and the charging result is slightly better. Compared with smooth chute, the chute with lining leads to a smaller radius of landing position (less than 0.13m) and a smaller width of material flow when the coke is distributed charged. The lining can also reduce the wear of chute surface of through the friction between particles and extend the service life of the chute.