王依,李永祥,徐雪萌.食品粉体螺旋输送荷电特性数值模拟[J].包装工程,2022,43(5):167-172.
WANG Yi,LI Yong-xiang,XU Xue-meng.Numerical Simulation of Screw Conveying Charge Characteristics of Food Powder[J].Packaging Engineering,2022,43(5):167-172. |
| 食品粉体螺旋输送荷电特性数值模拟 |
| Numerical Simulation of Screw Conveying Charge Characteristics of Food Powder |
| 投稿时间：2021-05-13 |
| DOI：10.19554/j.cnki.1001-3563.2022.05.023 |
| 中文关键词: 食品粉体:螺旋输送 荷电特性 摩擦充电 平均荷质比 |
| 英文关键词: food powder screw conveying charge characteristics friction charging average charge/mass ratio |
| 基金项目:国家重点研发计划(2018YFD0400704)，河南省科技厅自然科学项目(182102110163) |
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| 中文摘要: |
| 目的 研究食品粉体螺旋输送的荷电特性，为食品粉体除静电技术提供理论基础。方法 基于EDEM中“Tribocharging”摩擦充电模型以及“Hertz-Mindlin(no slip)”接触模型，用SolidWorks软件建立螺旋喂料结构三维模型并导入EDEM软件;以小麦粉为仿真材料，对同一转速、不同粒径或同一粒径、不同转速下的颗粒荷电过程进行模拟仿真。结果 在螺旋轴转速为100 r/min等距螺旋输送仿真条件下，粒径为0.1、0.2、0.3 mm小麦粉体颗粒的平均荷质比分别为1.43、1.6、2.45 nC/g;粒径为0.3 mm的小麦粉颗粒，在螺旋转速为80、100、120 r/min仿真条件下，平均荷质比分别为2.68、2.45、2.26 nC/g;带电颗粒主要集中在与料筒和螺旋体接触的区域，出料口中间区域存在带电量较少或不带电的颗粒。结论 小麦粉等距螺旋输送，颗粒的平均荷质比随粒径增大而增大，随螺旋轴转速增加而减小，为粉体除静电技术提供了参考。 |
| 英文摘要: |
| The work aims to study the screw conveying charge characteristics of food powder, so as to provide a theoretical basis for the electrostatic removal technology of food powder. Based on the “Tribocharging” friction charging model and the “Hertz-Mindlin (no slip)” contact model in EDEM, the three-dimensional model of spiral feeding structure was established by SolidWorks and imported into EDEM. With wheat flour as simulation material, the charged process of particles with the same speed and different particle size or the same particle size and different speed was simulated. The average charge/mass ratios of wheat powder particles with size of 0.1 mm, 0.2 mm and 0.3 mm were 1.43, 1.6 and 2.45 nC/g respectively, under the simulation condition of equidistance screw conveying at 100 r/min. The average charge/mass ratios of wheat flour particles with size of 0.3 mm were 2.68, 2.45 and 2.26 nC/g respectively, under the simulation conditions of screw speed of 80, 100 and 120 r/min. The charged particles were mainly concentrated in the area in contact with the cylinder and the helix, and there were particles with less charge or no charge in the middle area of the discharge port. The average charge/mass ratio of wheat powder increases with the increase of particle size and decreases with the increase of screw speed, which provides a reference for electrostatic removal technology of powder. |
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