粉体混合过程及搅拌功率的DEM数值模拟和实验

doi:10.16085/j.issn.1000-6613.2020-1509

化工进展 ›› 2021, Vol. 40 ›› Issue (7): 3598-3607.DOI: 10.16085/j.issn.1000-6613.2020-1509

粉体混合过程及搅拌功率的DEM数值模拟和实验

宣颖¹(), 刘雪东¹^,²(), 周成奇³, 刘文明¹^,², 刘红梅¹^,², 顾宇彤¹, 彭涛¹

^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
^3.安徽瑞旭搅拌设备有限公司，安徽广德 242200

收稿日期:2020-08-03 修回日期:2020-09-11 出版日期:2021-07-06 发布日期:2021-07-19
通讯作者: 刘雪东
作者简介:宣颖（1995—），女，硕士研究生，研究方向为粉体工程设备与技术。E-mail: 1165923433@qq.com。
基金资助:
中国石化科技研发计划(418020-4)

A discrete element method (DEM) simulation and experimental research on powder mixing process and stirring power

XUAN Ying¹(), LIU Xuedong¹^,²(), ZHOU Chengqi³, LIU Wenming¹^,², LIU Hongmei¹^,², GU Yutong¹, PENG Tao¹

^1.School of Mechanical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
^2.Jiangsu Key Laboratory of Green Process Equipment, Changzhou University, Changzhou 213164, Jiangsu, China
^3.Anhui Ruixu Mixing Equipment Co. , Ltd. , Guangde 242200, Anhui, China

Received:2020-08-03 Revised:2020-09-11 Online:2021-07-06 Published:2021-07-19
Contact: LIU Xuedong

摘要/Abstract

摘要：

采用数值模拟与功率测试相结合的方法，研究直叶桨式粉体混合机搅拌过程及搅拌功率、扭矩的变化规律。对粉体混合机内球形颗粒的混合过程进行离散单元法DEM数值模拟，研究直叶桨式粉体混合机内搅拌转速、搅拌桨直径、桨叶数目等特性参数对粉体混合时搅拌功率和扭矩的影响，并拟合得到功率计算公式。搭建粉体搅拌试验台，测试粉体搅拌功率并与模拟结果比较。结果表明，直叶桨式粉体混合机内功率消耗与搅拌桨转速、搅拌桨直径、桨叶数目等特性参数有密切关系。同时，扭矩值和功率值与搅拌桨转速、搅拌桨直径和桨叶数目都呈正相关。实验得到了与模拟类似的扭矩-转速关系以及功率-转速关系，模拟值与测试值具有较好的吻合性，验证了所推导公式的准确性。

关键词: 粉体, 搅拌功率, 扭矩, 数值模拟, 离散单元法

Abstract:

The mixing process, power and torque of straight blade impeller powder mixer were studied by combining numerical simulation with power test. The mixing process of spherical particles in the powder mixer was simulated by discrete element method (DEM). The effects of stirring speed, impeller diameter and blade number on the mixing power and torque were studied, and the power calculation formula was obtained by fitting. A powder mixing test-bed was built to test the power of powder mixing and compare with the simulation results. The results showed that the power consumption in the straight blade impeller powder mixer is closely related to the impeller speed, impeller diameter, blade number and other characteristic parameters. At the same time, torque value and power value were positively correlated with impeller speed, impeller diameter and blade number. The results showed that the torque speed relationship and power speed relationship were similar to the simulation, and the simulation values were in good agreement with the test ones, which verifies the accuracy of the derived formula.

Key words: powder, stirring power, torque, numerical simulation, DEM

中图分类号:

TQ027.1

宣颖, 刘雪东, 周成奇, 刘文明, 刘红梅, 顾宇彤, 彭涛. 粉体混合过程及搅拌功率的DEM数值模拟和实验[J]. 化工进展, 2021, 40(7): 3598-3607.

XUAN Ying, LIU Xuedong, ZHOU Chengqi, LIU Wenming, LIU Hongmei, GU Yutong, PENG Tao. A discrete element method (DEM) simulation and experimental research on powder mixing process and stirring power[J]. Chemical Industry and Engineering Progress, 2021, 40(7): 3598-3607.

图/表 15

图1 接触力模型

图2 粉体混合机仿真计算模型图（单位：mm）

表1 EDEM颗粒、壁面参数设置

项目	泊松比μ	密度ρ/kg·m^-3	剪切模量G/Pa
颗粒	0.35	1200	8.9×10⁸
壁面	0.37	1200	8×10⁸

表2 EDEM接触参数设置

颗粒与颗粒

颗粒与壁面

无滑移

0.45

0.6

0.4

0.05

图3 不同时刻颗粒的混合状态

图4 颗粒与壁面的碰撞次数

图5 100r/min下不同直径搅拌桨的颗粒分布云图

图6 不同直径搅拌桨的扭矩、功率随转速变化图

图7 不同桨叶数目搅拌桨的扭矩、功率随转速变化图

图8 固定转速下的y轴截面上的速度矢量变化图

图9 粉体混合机实验设备

图10 实验与模拟初始填充状态

图11 实验和模拟表面颗粒分布对比

图12 不同转速下实验与模拟结果对比

图13 不同转速下实验与模拟结果对比

参考文献 18

1	BRIDGWATER J. Mixing of powders and granular materials by mechanical means: a perspective[J]. Particuology, 2012, 10(4): 397-427.
2	KUMARESAN T, JOSHI J B. Effect of impeller design on the flow pattern and mixing in stirred tanks[J]. Chemical Engineering Journal, 2006, 115(3): 173-193.
3	SHI Q, YAN X. Experimental study of segregation patterns in binary granular mixtures under vertical vibration[J]. Chinese Science Bulletin, 2003, 48(7): 627-629.
4	JIAN J, ZHONG F, XING M. The calculation method of mixing power[J]. Journal of Xi'an Highway University, 2000, 20(3): 98-100.
5	汪建峰, 王广全, 操伟伟, 等. 折流式旋转床有效功耗的初步研究[J]. 化工进展, 2016, 35(4): 1022-1026.
	WANG J F, WANG G Q, CAO W W, et al. Preliminary studies on the effective power consumption of rotating zigzag bed[J]. Chemical Industry and Engineering Progress, 2016, 35(4): 1022-1026.
6	张哲, 苏杨, 马宁, 等. 低填充比下混合滚筒粉体混合特性数值模拟[J]. 化工进展, 2017, 36(1): 114-120.
	ZHANG Z, SU Y, MA N, et al. Simulation of mixing characteristics of rotary drum with low packing ratio of powder[J]. Chemical Industry and Engineering Progress, 2017, 36(1): 114-120.
7	KAZENIN D A, CHEPURA I V. Hydrodynamics, mass transfer, and power consumption in air-core stirred tank reactors[J]. Theoretical Foundations of Chemical, 2008, 42(2): 118-124.
8	马青山, 冯连芳. 卧式单轴粉体搅拌反应器的搅拌功率[J]. 高校化学工程学报, 1999, 13(1): 31-37.
	MA Q S, FENG L F. Power consumption for powder in horizontal agitated reactor[J]. Journal of Chemical Engineering of Chinese Universities, 1999, 13(1): 31-37.
9	杨敏官, 冯浪, 康灿, 等. 偏心搅拌槽内颗粒悬浮特性的试验研究[J]. 水电能源科学, 2012, 30(4): 129-131.
	YANG M G, FENG L,KANG C, et al. Experimental study on critical suspension speed of shaft in eccentrically stirred tank[J]. Water Resources and Power, 2012, 30(4): 129-131.
10	SATO Y, NAKAMURA H, WATANO S. Numerical analysis of agitation torque and particle motion in a high shear mixer[J]. Powder Technology, 2008, 186(2): 130-136.
11	SIRAJ, SHAFIQ M. Single-blade convective powder mixing: the effect of the blade shape and angle[J]. Powder Technology, 2014, 267: 289-301.
12	REMY B, CANTY T M, KHINAST J G, et al. Experiments and simulations of cohesionless particles with varying roughness in a bladed mixer[J]. Chemical Engineering Ence, 2010, 65(16): 4557-4571.
13	BAO Y Y, LI T C, WANG D F, et al. Discrete element method study of effects of the impeller configuration and operating conditions on particle mixing in a cylindrical mixer[J]. Particuology, 2020, 49: 146-158.
14	CLEARY P W, SINNOTT M D. Assessing mixing characteristics of particle-mixing and granulation devices[J]. Particuology, 2008, 6(6): 419-444.
15	CUNDALL P A, STRACK O D L. A discrete numerical model for granular assemblies[J]. Geotechnique, 1979, 29(1): 47-65.
16	ROJEK J, LABRA C, SU O, et al. Comparative study of different discrete element models and evaluation of equivalent micromechanical parameters[J]. International Journal of Solids and Structures, 2012, 49(13): 1497-1517.
17	陈程, 刘雪东, 罗召威, 等. 旋转流化床粉体混合机混合效果数值模拟和实验验证[J]. 化工进展, 2018, 37(9): 3294-3302.
	CHEN C，LIU X D，LUO Z W, et al. Numerical simulation and experimental verification of mixing effect in rotating fluidized bed powder mixer[J]. Chemical Industry and Engineering Progress, 2018, 37(9): 3294-3302.
18	谢红笑, 刘雪东, 尹传忠, 等. 机械式高速混合机内部多粒径颗粒混合特性仿真[J]. 中国粉体技术, 2018, 24(2): 11-17.
	XIE H X, LIU X D, YIN C Z, et al. Numerical simulation of polydisperse particles mixing characteristics in a mechanical high speed mixer[J]. China Powder Science and Technology, 2018, 24(2): 11-17.

[1]	郭强, 赵文凯, 肖永厚. 增强流体扰动强化变压吸附甲硫醚/氮气分离的数值模拟[J]. 化工进展, 2023, 42(S1): 64-72.
[2]	邵博识, 谭宏博. 锯齿波纹板对挥发性有机物低温脱除过程强化模拟分析[J]. 化工进展, 2023, 42(S1): 84-93.
[3]	王太, 苏硕, 李晟瑞, 马小龙, 刘春涛. 交流电场中贴壁气泡的动力学行为[J]. 化工进展, 2023, 42(S1): 133-141.
[4]	陈匡胤, 李蕊兰, 童杨, 沈建华. 质子交换膜燃料电池气体扩散层结构与设计研究进展[J]. 化工进展, 2023, 42(S1): 246-259.
[5]	刘炫麟, 王驿凯, 戴苏洲, 殷勇高. 热泵中氨基甲酸铵分解反应特性及反应器结构优化[J]. 化工进展, 2023, 42(9): 4522-4530.
[6]	赵曦, 马浩然, 李平, 黄爱玲. 错位碰撞型微混合器混合性能的模拟分析与优化设计[J]. 化工进展, 2023, 42(9): 4559-4572.
[7]	叶振东, 刘涵, 吕静, 张亚宁, 刘洪芝. 基于钙镁二元盐的热化学储能反应器的性能优化[J]. 化工进展, 2023, 42(8): 4307-4314.
[8]	俞俊楠, 俞建峰, 程洋, 齐一搏, 化春键, 蒋毅. 基于深度学习的变宽度浓度梯度芯片性能预测[J]. 化工进展, 2023, 42(7): 3383-3393.
[9]	单雪影, 张濛, 张家傅, 李玲玉, 宋艳, 李锦春. 阻燃型环氧树脂的燃烧数值模拟[J]. 化工进展, 2023, 42(7): 3413-3419.
[10]	王硕, 张亚新, 朱博韬. 基于灰色预测模型的水煤浆输送管道冲蚀磨损寿命预测[J]. 化工进展, 2023, 42(7): 3431-3442.
[11]	周龙大, 赵立新, 徐保蕊, 张爽, 刘琳. 电场-旋流耦合强化多相介质分离研究进展[J]. 化工进展, 2023, 42(7): 3443-3456.
[12]	卢兴福, 戴波, 杨世亮. 转鼓内圆柱形颗粒混合的超二次曲面离散单元法模拟[J]. 化工进展, 2023, 42(5): 2252-2261.
[13]	张晨宇, 王宁, 徐洪涛, 罗祝清. 纳米颗粒强化传热的多级潜热储热器性能评价[J]. 化工进展, 2023, 42(5): 2332-2342.
[14]	马润梅, 杨海超, 李正大, 李双喜, 赵祥, 章国庆. 表面强化镀层对高速轴承腔密封端面变形及摩擦磨损影响分析[J]. 化工进展, 2023, 42(4): 1688-1697.
[15]	张成松, 张静, 龚斌, 李明洋, 袁佳新, 李宏业. 自吸射流柔性搅拌桨振动特性[J]. 化工进展, 2023, 42(4): 1728-1738.

粉体混合过程及搅拌功率的DEM数值模拟和实验

A discrete element method (DEM) simulation and experimental research on powder mixing process and stirring power

RichHTML

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

图/表 15

参考文献 18

相关文章 15

编辑推荐

Metrics

本文评价