基于DEM的3种匀盘结构的玉米种子丸粒化数值模拟  

Numerical simulation on pelletization of corn seeds with three uniform plate structures based on DEM

作　　者：李红军 孙文杰 张弛 张成俊 杜玮 陈伟 LI Hongjun;SUN Wenjie;ZHANG Chi;ZHANG Chengjun;DU Wei;CHEN Wei(School of Mechanical Engineering and Automation,Hubei Engineering Research Center of Industrial Detonator Intelligent Assembly,Wuhan Textile University,Wuhan 430200,China)

机构地区：[1]武汉纺织大学机械工程与自动化学院,工业雷管智能装配湖北省工程研究中心,湖北武汉430200

出　　处：《中国粉体技术》2024年第6期149-161,共13页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:52108221;湖北省科技创新人才计划项目,编号:2023DJC075。

摘　　要：【目的】解决种子丸粒包衣质量不高、种粉间混合均匀度差的问题。【方法】分析3种匀盘结构的丸粒化机制,模拟玉米种子丸粒化过程;基于离散元软件EDEM建立玉米种子丸粒化的仿真模型,将离散系数作为评价指标研究3种匀盘结构的转速、振动频率、振动幅度对种粉间混合均匀度的影响;通过Design-Expert软件建立玉米种子离散系数的二阶回归方程进行方差分析。【结果】3种匀盘结构的最优工艺参数组合分别为:匀盘Ⅰ的转速为50 r/min,振动频率为10 Hz,振动幅度为6 mm;匀盘Ⅱ的转速为60 r/min、振动频率为15 Hz,振动幅度为6 mm;匀盘Ⅲ的转速为70 r/min,振动频率为20 Hz,振动幅度为8 mm。【结论】当匀盘Ⅰ的转速为56.3 r/min、振动频率为11.5 Hz,振动幅度为5.8 mm时,玉米种子丸粒化效果最优,为玉米种子包衣技术提供理论依据自我评价。Objective To solve the problems of low coating quality and poor mixing uniformity of seed powder in the pelletization process of corn seeds.Methods Based on the existing pelletization research,three plate structures were designed to achieve an optimal mixing efficiency by changing the contact area between the plate structure and seed powder.The study analyzed the pelletization mechanism of the three structures and simulated their pelletization process of corn seeds.A particle-filling method was adopted to make the model closer to the shape of actual corn seeds.To reduce simulation time,the number of corn seed filling particles was reduced to 33.A simulation model of the corn seed pelletization process was established using the discrete element software(DEM)software EDEM,and the Hertz-Mindlin with Johnson-Kendall-Roberts(JKR)contact model was used to describe the bonding behavior between particles.The mixed motion of the three plate structures at the early,middle,and late stages of the simulation was compared and analyzed.The effects of rotational speed,vibration frequency,and vibration amplitude on seed and powder mixing uniformity were studied using the dispersion coefficient as the evaluation index.The coating quality was evaluated based on the coordination number of the seeds,which represented the number of surrounding particles.A higher coordination number indicated better coating quality.The quadratic regression equation for corn seed dispersion coefficient was established using Design-Expert software for variance analysis.Rotational speed,vibration frequency,and vibration amplitude of uniform plate Ⅰ were set at 50 r/min,10 Hz and 6 mm respectively.Using these test factors,17 sets of simulation tests were performed,and the resulting discrete coefficients were analyzed.Results and Discussion The results showed that the critical conditions for plate speed were related to the structure,diameter,and edge angle of the plate,all of which affected the coating quality.At the initial stage of pelletization,the see

关 键 词：丸粒化 离散元模型 包衣 数值模拟 

分 类 号：TB44[一般工业技术]