单体壁结构对干法制备氧化锆颗粒混合过程的影响  

Effect of Single Wall Structure on Zirconia Particles Mixing Process by Dry Granulation

作　　者：江竹亭 宁翔 赵增怡 吴南星 廖达海 JIANG Zhuting;NING Xiang;ZHAO Zengyi;WU Nanxing;LIAO Dahai(School of Mechanical and Electronic Engineering,Jingdezhen Ceramic Institute,Jingdezhen 333403,China)

机构地区：[1]景德镇陶瓷大学机械电子工程学院

出　　处：《中国陶瓷》2019年第12期33-41,共9页China Ceramics

基　　金：国家自然科学基金项目(51365018);江西省科技支撑计划(20151BBE50041)

摘　　要：为提高氧化锆颗粒的级配比及流动性,探究旋转室单体壁结构参数对氧化锆粉体混合过程的影响。构建粉体混合区域物理模型,通过修正欧拉双相流数学模型求解空气和粉体的分布状态,通过RNGk-ε湍流模型对流场中的湍流状态进行计算,利用以上方法分析旋转室内粉体体积分数分布及粉体速度分布。结果表明:当旋转室内分别含扇形单体壁结构、半圆形单体壁结构时,粉体平均体积分数分别为0.25、0.22;粉体平均速度分别为0.70 m/s、0.63 m/s;颗粒球形度分别为0.91、0.73;颗粒流动性指数分别为91.34、80.63。扇形单体壁结构旋转室内粉体轴向运动强度较高,固体回转区范围较小。以上方法和结果有助于改善干法制备的氧化锆颗粒性能,并对旋转室内单体壁结构设计提供一定理论基础。In order to improve the gradation and fluidity of zirconia particles,the effect of single wall structure parameters on the zirconia powders mixing process is investigated.The physical model of powder mixing area is constructed.The distribution of air and powder is solved by modifying euler two-phase flow mathematical model.The turbulent state in the flow field is calculated by RNG k-εturbulence model.The volume fraction distribution and velocity distribution of powder in the rotating room are analyzed by the above methods.The results show that when the rotating room contains single sector wall structure and single semicircular wall structure respectively,the average volume fractions of powders are 0.25,0.22.The average velocities of powders are 0.70 m/s,0.63 m/s.The sphericity of particles are 0.91,0.73.The fluidity index of particles are 91.34,80.63,respectively.The axial motion strength of powder in the rotating room with single sector wall structure is higher,and the range of solid rotating zone is smaller.The above methods and results are helpful to improve the properties of zirconia particles prepared by dry granulation,and provide a theoretical basis for the design of single wall structure in rotating room.

关 键 词：氧化锆干法制粒 欧拉双相流 单体壁结构 颗粒流动性 

分 类 号：TQ174.5[化学工程—陶瓷工业]