基于DEM的回转筛分数值模拟和效果研究  

Numerical Simulation and Effect of Rotary Screening Based on DEM

作　　者：张昊晨 张超 曹宪周[1] 刘海芃 高涛 ZHANG Hao-chen;ZHANG Chao;CAO Xian-zhou;LIU Hai-peng;GAO Tao(College of Mechanical Engineering,Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]河南工业大学机电工程学院,郑州450001

出　　处：《包装工程》2023年第7期241-249,共9页Packaging Engineering

基　　金：国家重点研发计划(2017YFD0401101);河南省教育厅高等学校重点科研项目(22B460006);河南工业大学高层次人才基金(2019BS016)。

摘　　要：目的在粮食储藏和加工过程中,平面回转筛是重要的粮食筛分清理设备。研究各项筛分处理参数对回转筛筛分性能的影响,并寻找回转筛的最优筛分参数。方法基于离散元法(DEM)对回转筛在不同参数条件下的回转筛分过程进行数值模拟,以筛分流量、回转速度、回转半径和筛面倾角为4项变量依次进行单因素分析,得出各参数对筛分性能指标(筛分效率、除杂效率和物料流动速度)的影响规律,再以此选取各因素的较优水平范围进行多因素正交试验,并采用矩阵分析方法对试验结果进行权重排序。结果得到了综合各项性能评价指标较优的参数组合:筛分流量为3.0 t/h,回转速度为465 r/min,回转半径为24 mm,筛面倾角为9°。结论研究结果表明,寻求更优的筛分效率必然会降低除杂效率和物料流动速度,即物料在筛面上停留时间越长就越能增大其通过筛孔机会,同时杂质通过筛孔的概率也在增大。Flat rotary screen is an important grain screening and cleaning device during grain storage and processing.The work aims to study the effect of the various screening parameters on the screening performance of rotary screen,and find out the optimal screening parameters.Based on the Discrete Element Method(DEM),numerical simulation was carried out to the rotary screening under different parameters.Four variables of screening flow,rotation speed,rotation radius and screen inclination were adopted in turn to conduct single factor analysis.Then,the effect law of each parameter on screening performance indexes of screening efficiency,impurity removal efficiency and material flow speed was obtained,and the optimal level range of each factor was selected for multi-factor orthogonal test.Finally,the test results were weighted by matrix analysis method.The better parameter combination of comprehensive performance evaluation indexes was obtained:screening flow of 3.0 t/h,rotation speed of 465 r/min,rotation radius of 24 mm,and screen inclination of 9°.Seeking better screening efficiency will inevitably reduce the impurity removal efficiency and material flow speed,that is,the longer retention time on the screening surface can increase the chance for materials to pass through the screen.Therefore,the probability of impurities passing through the screen is also increasing.

关 键 词：粮食筛理 离散元法 筛分性能 数值模拟 

分 类 号：TS210.3[轻工技术与工程—粮食、油脂及植物蛋白工程] TS211.3[轻工技术与工程—食品科学与工程]