基于离散元方法的差动自清洁混合器混合特性研究

doi:10.19491/j.issn.1001-9278.2020.04.010

中国塑料 ›› 2020, Vol. 34 ›› Issue (4): 54-59.DOI: 10.19491/j.issn.1001-9278.2020.04.010

基于离散元方法的差动自清洁混合器混合特性研究

单喜良, 马玉录, 谢林生(), 朱惠豪, 丁大有

华东理工大学绿色高效过程装备与节能教育部工程研究中心，上海 200237

收稿日期:2019-11-28 出版日期:2020-04-26 发布日期:2020-04-26

Study on Mixing Characteristics of Differential Self⁃cleaning Mixer Based on Discrete Element Method

Xiliang SHAN, Yulu MA, Linsheng XIE(), Huihao ZHU, Dayou DING

Engineering Center of Efficient Green Process Equipment and Energy Conservation of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

Received:2019-11-28 Online:2020-04-26 Published:2020-04-26
Contact: Linsheng XIE E-mail:clxw@ecust.edu.cn

摘要/Abstract

摘要：

采用离散元方法对LIST卧式差动双轴搅拌设备内高密度聚乙烯（PE?HD）填充碳酸钙复合材料的混合过程进行了仿真模拟，研究了不同加料速率及不同转速条件对该类自清洁混合器混合腔内物料充满度、物料停留时间分布及混合均匀程度的影响。结果表明，该类自清洁混合器的轴向输送能力主要由后续物料的推动作用实现，采用高速轴转速40 r/min，加料速率为10 kg/h的工艺参数可以获得最佳的混合均匀程度。

关键词: 自清洁混合器, 离散元方法, 混合特性

Abstract:

The mixing process of calcium carbonate?filled PE?HD composite in the LIST horizontal differential biaxial mixing equipment was simulated by a discrete element method, and the effects of addition speed and mixing rate on the material filling degree, residence time distribution and mixing uniformity of compounds in the self?cleaning mixer were investigated. The results indicated that the axial conveying capacity of the self?cleaning mixer was mainly derived from the pushing effect of subsequent materials. The optimum mixing effect could be achieved at a shaft rotation speed of 40 r/min and a feeding rate of 10 kg/h.

Key words: self?cleaning mixer, discrete method, mixing characteristics

中图分类号:

TQ 051.7

单喜良, 马玉录, 谢林生, 朱惠豪, 丁大有. 基于离散元方法的差动自清洁混合器混合特性研究[J]. 中国塑料, 2020, 34(4): 54-59.

Xiliang SHAN, Yulu MA, Linsheng XIE, Huihao ZHU, Dayou DING. Study on Mixing Characteristics of Differential Self⁃cleaning Mixer Based on Discrete Element Method[J]. China Plastics, 2020, 34(4): 54-59.

图/表 11

结构参数	数值
长×宽×高/mm	310×175×120
中心距/mm	58
机筒内径/mm	82
搅拌轴长/mm	280
搅拌轴外径/mm	80
搅拌轴外径/mm	30

表1 自清洁混合器主要结构参数

Tab.1 Structural parameters of self?cleaning mixer

图1 自清洁混合器几何模型

Fig.1 Self?cleaning mixer geometry model

颗粒材料	参数	参数值
PE?HD?PE?HD	拉开力/N	0
	表面能/ J·m^-2	3
	接触塑性变形比	0.8
	切向刚度系数	0.3
PE?HD?碳酸钙	拉开力/N	0
	表面能/ J·m^-2	2
	接触塑性变形比	0.5
	切向刚度系数	0.25
碳酸钙?碳酸钙	拉开力/N	0
	表面能/ J·m^-2	0.25
	接触塑性变形比	0.2
	切向刚度系数	0.8

表2 EEPA接触模型参数设置

Tab. 2 EEPA model’s parameter settings

图2 不同加料速率下混合器物料平衡时间及混合腔内物料充满度的变化曲线（高速轴转速为40 r/min）

Fig.2 Curve of equilibration time and material fullness at different feed rates

图3 不同转速下混合器平衡时间及混合腔内物料充满度的变化曲线（加料速率为10 kg/h） Fig.3　Curve of equilibration time and material fullness at different speeds(Feed rate is 10 kg/h)

图4 不同加料速率下混合器内物料停留时间分布曲线（高速轴转速为40 r/min） Fig.4　RTD curve in the mixer at different feed rates (High speed shaft speed is 40 r/min)

图5 不同转速下混合器内物料停留时间分布曲线（加料速率为10 kg/h） Fig.5　RTD curve in the mixer at different speeds (Feed rate is 10 kg/h)

图6 混合器网格划分示意

Fig.6 Mesh division of the mixer

图7 混合腔内不同区域的离散系数随时间变化的曲线

Fig.7 Time?dependent variation curve of discrete coefficient λ in different regions of a mixing chamber

图8 混合器稳定状态下不同加料速率下G05区域离散系数λ变化曲线（600 s，高速轴转速为40 r/min）

Fig.8 G05 regional dispersion coefficient λ curve at different feed rates under steady state of the mixer

图9 混合器稳定状态下不同转速下G05区域离散系数的变化曲线（600 s，加料速率为10 kg/h）

Fig.9 Dispersion coefficient λ curve in G05 at different speeds of the mixer under steady state

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基于离散元方法的差动自清洁混合器混合特性研究

Study on Mixing Characteristics of Differential Self⁃cleaning Mixer Based on Discrete Element Method

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