滚筒筛式膜杂分离装置数值模拟与参数优化

doi:10.13733/j.jcam.issn.2095-5553.2024.04.001

摘要/Abstract

摘要： 滚筒筛式膜杂分离装置存在膜杂混合物经筛分后膜中含杂率高等问题，利用计算流体力学(CFD)与离散元(DEM)耦合方法，对滚筒筛式膜杂分离装置清选室气流场动态分布以及装置内物料运动情况进行数值模拟，确定工作参数范围。选取气流角度、进气口风速和滚筒转速为试验因素，进行气固两相流耦合仿真试验，分析各试验因素对清选室气流场以及对装置内物料运动情况的影响，以产出物含膜率、杂中含膜率及残膜产出量为评价指标，开展三因素三水平正交试验，通过多目标优化的方法得到最佳工作参数组合：进气口风速为8.5 m/s、气流角度为8°、滚筒转速为26 r/min，在此条件下进行验证试验，结果表明：产出物含膜率为89.31%、杂中含膜率为1.99%、残膜产出量为0.032 6 kg/s，试验结果与理论优化值相对误差小于7%，各指标分别优于工作参数优化前0.87个、3.82个、6.57个百分点。该研究验证基于DEMCFD气固两相流耦合仿真对滚筒筛式膜杂分离装置流场分析的可行性，为滚筒筛式膜杂分离装置作业参数优化提供理论依据。

关键词: DEMCFD耦合, 膜杂分离, 数值模拟, 正交试验, 响应面分析

Abstract: Aiming at the problems of high impurity content in the membrane after sieving the membrane impurity mixture caused by the lack of theoretical support of the trommel screen type membrane and impurity separation device and the unreasonable setting of working parameters. The dynamic distribution of the air flow field in the sorting chamber of the trommel screen type membrane and impurity separation device and the movement of materials in the device are numerically simulated to determine the best combination of working parameters, by using computational fluid dynamics and discrete element coupling method. The airflow angle, air inlet wind speed and trommel screen speed were selected as test factors to conduct gassolid twophase flow coupling simulation test, to analyze the influence of various test factors on the air flow field in the sorting chamber and the movement of materials in the device. Taking the film content rate of the output, the film content rate of impurities and the output of residual film as evaluation indicators, a threefactor, threelevel orthogonal test was carried out. The test results were subjected to multiple regression analysis, and the best combination of working parameters was obtained through the multiobjective optimization method: the air inlet wind speed was 8.5 m/s, the airflow angle was 8°, and the trommel speed was 26 r/min. The verification tests were carried out under these conditions, the results showed that the film content rate of the output was 89.31%, the film content rate of impurities was 1.99%, and the output of residual film was 0.032 6 kg/s. The relative error between the experimental results and the theoretical optimization value was less than 7%, and the indicators were 0.87, 3.82 and 6.57 percentage points better than that before the optimization of working parameters, respectively. The study verified the feasibility of analyzing the flow field of the trommel screen type membrane and impurity separation device based on DEMCFD gassolid twophase flow coupling simulation, and provided a theoretical basis for the optimization of the operating parameters of the trommel screen type membrane and impurity separation device.

Key words: DEMCFD coupling, membrane impurity separation, numerical simulation, orthogonal experiment, response surface analysis

中图分类号:

S223.5

解臣硕, , 康建明, , 彭强吉, , 林向阳, 侯加林, . 滚筒筛式膜杂分离装置数值模拟与参数优化[J]. 中国农机化学报, 2024, 45(4): 1-11.

Xie Chenshuo, , Kang Jianming, , Peng Qiangji, , Lin Xiangyang, Hou Jialin, . Numerical simulation and parameter optimization of trommel screen type membrane and impurity separation device[J]. Journal of Chinese Agricultural Mechanization, 2024, 45(4): 1-11.

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