| 摘要: |
| 为提高肥料滚筒分选机工作性能，探明肥料颗粒运动规律，基于离散元法建立肥料整粒及破损颗粒模型，对滚筒分选机内肥料颗粒的运动规律进行研究。结果表明，滚筒内肥料颗粒在达到稳定运动状态时发生了分层现象，可分为自由层、交接层及迟滞层。自由层内颗粒以雪崩式流动为主，交接层内颗粒绕区域中心位置发生回转运动，迟滞层内颗粒则紧贴壁面被提升；沿滚筒轴向划分统计区域对破损肥料分布位置进行分析，发现破损肥料在运动过程中发生了轴向偏析，由滚筒两端向轴向几何中心聚集。交接层内破损肥料逐步向自由层及迟滞层内聚集；破损肥料脱离窝眼后均能落入收集槽，最小脱离角为32.5°，最大为47.1°。对模拟结果进行试验验证，结果表明:试验数据与仿真数据对比误差小于10%，证明采用离散元法研究滚筒分选机内肥料运动是可行的。 |
| 关键词: 肥料分选 滚筒 离散元法 施肥 |
| DOI：10.11841/j.issn.1007-4333.2020.11.12 |
| 投稿时间：2020-02-19 |
| 基金项目:国家自然科学基金项目(51775115；51405086) |
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| Simulation and experiment of fertilizer movement characteristics in drum separator |
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SONG Xuefeng1,DAI Fei1*,SUN Yaoheng2,ZHANG Fangyuan1,ZHANG Fengwei1,ZHAO Wuyun1
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| (1.College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou 730070, China;2.Baiyin Vocational College of Mining & Metallurgy, Department of Mechanical and Electrical Engineering, Baiyin 730900, China) |
| Abstract: |
| In order to improve the performance of the drum separator of fertilizer, explore the movement law of fertilizer particles, this study established the model of fertilizer whole particle and damaged particle based on the discrete element method, and studied the movement law of fertilizer particles in the drum separator. The results showed that the fertilizer particles in the drum were stratified when they reached a stable movement state, which could be divided into free layer, interface layer and hysteresis layer. The particles in the free layer mainly flowed in avalanche mode, and the particles in the interface layer rotated around the center of the region, while the particles in the sluggish layer were lifted close to the wall; The distribution position of the damaged fertilizer was analyzed by dividing the statistical area along the axial direction of the drum. It was found that the damaged fertilizer has axial segregation during the movement process, and the two ends of the drum were gather to the axial geometric center. The damaged fertilizer in the interface layer gradually accumulated in the free layer and the sluggish layer; The damaged fertilizer could fall into the collection tank after it left the socket, with the minimum separation angle of 32. 5° and the maximum of 47. 1°. In order to verify the simulation results, an experimental test was conducted showing that the error between the experimental and the simulation data was less than 10% proving that it was feasible to use the discrete element method to study the fertilizer movement in the drum separator. |
| Key words: fertilizer separation drum discrete element method fertilization |
