摘要
在烧结前需要对原料进行制粒处理,以提高原料颗粒的粒度和成分均匀性,进而提高烧结料层的透气性及烧结效率。本文以离散单元法中的Linear Cohesion颗粒接触模型为基础,并采用API定义湿颗粒含水量的能量密度K,模拟湿颗粒在高剪切制粒中的运动行为。结果表明:K对于颗粒的碰撞和接触起着关键作用。当K取值在1~6 MJ/m3范围内时,随着K值的增加,高剪切制粒机中润湿颗粒的平均速度也随之增加。K较小的湿颗粒之间接触较少,不利于准颗粒的形成。当K取值在5~6 MJ/m3时,颗粒之间接触数量较为稳定且达到最大值,有利于原料的均匀和碰撞长大。此外,旋转叶片的转速与颗粒平均速度及碰撞次数成正比,在转速为90 r/min时颗粒的平均速度最大且碰撞次数最多,有利于颗粒的快速聚结生长。
Before sintering,it is necessary to granulate the raw materials to improve the particle size and composition uniformity of the raw material particles,and then improve the air permeability of the sinterbed and sintering efficiency.Based on the Linear Cohesion particle contact model in the DEM,the API is used to define the energy density K of the water content of wet particles,and the motion behavior of wet particles in highshear granulation is simulated.The results show that the K plays a key role in the collision and contact of particles.When the K value is in the range of 1~6 MJ/m3,the average velocity of wet particles in the high shear granulator also increases with the increase of K value.Smaller wet particles have less contact with each other,which is not conducive to the formation of quasiparticles.When the K value is 5~6 MJ/m3,the contact number between particles is relatively stable and reaches the maximum value,which is conducive to the uniformity and collision growth of raw materials.In addition,the rotation speed of the rotating blade is proportional to the average velocity of the particles and the number of collisions,and the average velocity of the particles is the largest and the number of collisions is the largest when the rotation speed is 90 r/min,which is conducive to the rapid coalescence and growth of the particles.
作者
简林飞
黄青云
游洋
吕学伟
何建生
JIAN Linfei;HUANG Qingyun;YOU yang;LXuewei;HE Jiansheng(School of Metallurgy and Power Engineering,Chongqing University of Science and Technology,Chongqing 401331,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)
出处
《烧结球团》
北大核心
2024年第5期63-69,共7页
Sintering and Pelletizing
基金
国家自然科学基金面上项目(51974053)
重庆市自然科学基金面上项目(cstc2021jcyj-msxmX0882)
重庆科技大学硕士研究生创新计划资助项目(YKJCX2220212)
