基于相似原理的超细粉体搅拌功率的实验和DEM数值模拟  

Experiment and DEM numerical simulation of mixing power of ultrafine powder based on similarity theory

作　　者：陈荟 刘雪东[1,2] 刘文明 郑蔚文[1,2] 张红红 吕开新 Hui CHEN;Xuedong LIU;Wenming LIU;Weiwen ZHENG;Honghong ZHANG;Kaixin LU(School of Mechanical Engineering,Changzhou University,Changzhou,Jiangsu 213164,China;Jiangsu Key Laboratory of Green Process Equipment,Changzhou University,Changzhou,Jiangsu 213164,China)

机构地区：[1]常州大学机械工程学院,江苏常州213164 [2]江苏省绿色过程装备重点实验室,江苏常州213164

出　　处：《过程工程学报》2023年第11期1506-1517,共12页The Chinese Journal of Process Engineering

基　　金：中国石化科技研发计划(编号:418020-4)。

摘　　要：采用实验研究和数值模拟相结合的方法,研究机械式粉体搅拌机内超细粉体搅拌过程的搅拌功率、扭矩的变化规律。对平均粒径为10.56μm的轻质碳酸钙粉体进行搅拌实验,研究了机械式粉体搅拌机内的操作参数,包括搅拌转速、桨叶位置、料面高度的变化对超细粉体搅拌功率和扭矩的影响,拟合得出了功率计算的表达式。利用相似原理放大粉体细颗粒,对放大的粗颗粒进行虚拟实验,获得接触参数;对粗颗粒搅拌过程进行DEM数值模拟,将模拟搅拌功率和扭矩的结果与实验结果进行比较。结果表明,机械式粉体搅拌机内超细粉体搅拌功率消耗与搅拌桨转速、桨叶位置、料面高度等参数密切相关。同时,扭矩值与功率值与搅拌桨转速、料面高度呈正相关,与桨叶位置呈负相关。模拟的扭矩值和功率值与实验的扭矩值和功率值比值与颗粒放大因子基本吻合,验证了相似原理应用于研究桨叶位置和料面高度对搅拌功率特性的影响的准确性。In order to study the correlation between the stirring power characteristics of ultrafine powder and the operating parameters and the calculation expression of stirring power,the problems of difficult calculation and lengthy calculation time in ultrafine powder stirring simulation were solved.The method of combining experimental research and numerical simulation was used to study the variation law of stirring power and torque of the ultrafine powder mixing process in the mechanical powder mixer.The stirring experiment of light calcium carbonate powder with an average particle size of 10.56μm was carried out,and the operating parameters in the mechanical powder mixer,including the effects of rotational speed,blade position,and material surface height on the stirring power and torque of ultrafine powder were studied,and the expression of power calculation was obtained.Using the similar principle,the fine particles of the powder were enlarged,and the virtual experiments were carried out on the enlarged coarse particles to obtain the contact parameters.The DEM numerical simulation of the coarse particle stirring process was carried out,and the results of the simulated stirring power and torque were compared with the experimental results.The results showed that the mixing power consumption of ultrafine powder in the mechanical powder mixer was closely related to the parameters of the rotational speed,blade position,material surface height and so on.At the same time,the torque value and power value were positively correlated with rotational speed and material surface height,and negatively correlated with the blade position.The ratios of simulated torque value and power value to experimental torque value and power value were basically consistent with the particle amplification factor,which verified the accuracy of the similar principle applied to study the influence of blade position and material surface height on the stirring power characteristics.

关 键 词：超细粉体 搅拌功率 扭矩 相似原理 数值模拟 

分 类 号：TQ027.2[化学工程]