溜槽对高炉无料钟布料粒度偏析的影响研究

THE EFFECT OF THE CHUTE ON THE PARTICLE SIZE SEGREGATION IN A BELL-LESS TOP BLAST FURNACE

为研究溜槽对高炉无料钟布料偏析的影响,采用离散元方法模拟了无料钟卸料过程,得到了溜槽上颗粒的速度分布,布料结果的径向、周向粒度分布,并分析了溜槽内表面的键槽、截面形状和倾角对粒度偏析的影响规律,结果表明:(1)溜槽上的键槽会引起布料结果周向偏析;(2)溜槽方形截面较圆形截面更有利于精确的径向布料;(3)不同溜槽倾角下,径向偏析不同,结果为高炉布料工艺的设计及炉料分布的精确控制提供科学依据.

In order to study the influence of the chute on the particle size segregation during the discharging process of a bell-less top blast furnace,this paper uses the discrete element method(DEM) to simulate the discharging process,and obtain the velocity field of particles on the chute and the particle size distribution in both radial and circumferential directions.In addition,the influences of the key slots on the inner surface of the chute,the section area shape and the tilting angle of the chute on the particle size segregation are analyzed.It is shown that(1) the keyslots on the inner surface of the chute cause a circumferential particle size segregation;(2) a square section area is better than a circle one for it facilitates an accurate radial particle distribution;(3)the tilting angle of the chute influences the radial particle size segregation.This study provides a theoretical basis for the design of blast furnace discharging process and the control of the burden distribution.