废塑料薄膜风选柔性变形及关键技术研究

发布时间：2018-07-14 12:31

【摘要】：随着塑料的大量使用,废塑料薄膜的回收利用越来越受到关注。废塑料薄膜回收利用的关键是分选方法的选择,旋风分选作为一种无污染、效率高的分选方法逐渐得到人们的重视。目前对废塑料薄膜分选的研究还主要将塑料薄膜假设为颗粒进行建模分析,而对废塑料薄膜本身的变形研究相对较少。因此,本文主要对塑料薄膜本身的变形规律和分选关键技术进行系统性研究,主要研究内容如下:(1)提出了分析风力分选废塑料薄膜变形的虚拟质点法,阐述了虚拟质点法的描述方法,建立了质点计算公式;分析得到了线单元的计算公式和外力转换公式。运用该方法建立了废塑料薄膜的数学分析模型,求解得到了塑料薄膜变形与风速之间的关系,为后续旋风分离器的优化设计提供了有效的研究方法。(2)使用ANSYS Workbench软件建立了废塑料薄膜在风场中的分析模型,对废塑料薄膜在不同风力下的状态进行了双向流固耦合分析,得到了废塑料薄膜在多种风力作用下的变形规律。对比仿真结果与虚拟质点法的计算结果,验证了虚拟质点法在求解分选薄膜变形方面的适用性,该方法具有计算量小、速度快的特点。(3)搭建了实验平台,设计了分选废塑料薄膜变形实验方案,进行了废塑料薄膜在不同状态下的风力分选实验;通过Matlab软件拟合处理数据得到了风速与位置坐标的函数关系;使用高速摄像机记录标记薄膜的风选图像,研究了基于图像测量变形量的方法,得到了虚拟质点法理论值与实验值的误差,为下一步旋风分离器的仿真分析提供了理论指导。(4)根据虚拟质点法、仿真和实验分析结论,对分选废塑料薄膜的旋风分离器进行了优化设计。使用Solidworks软件建立了旋风分离器的分析模型,使用Fluent流体分析软件仿真分析了不同风速时的旋风分离器工作状态。通过对仿真结果的分析研究,确定了旋风分离器分选的最佳风速,优化了旋风分离器结构尺寸。
[Abstract]:With the extensive use of plastics, more and more attention has been paid to the recycling of waste plastic film. The selection of separation method is the key to recycling waste plastic film. As a kind of non-pollution and high efficiency separation method, cyclone separation has been paid more and more attention. At present, the research on the separation of waste plastic film mainly assumes that the plastic film is modeled as a particle, but the research on the deformation of the waste plastic film itself is relatively few. Therefore, this paper mainly studies the deformation law of plastic film itself and the key technology of sorting. The main research contents are as follows: (1) the virtual particle method is proposed to analyze the deformation of waste plastic film by wind separation. In this paper, the description method of virtual particle method is described, the formula of particle calculation is established, the calculation formula of line element and the formula of external force conversion are obtained by analysis. Using this method, the mathematical analysis model of waste plastic film is established, and the relationship between plastic film deformation and wind speed is obtained. It provides an effective research method for the optimization design of the cyclone separator. (2) the analysis model of waste plastic film in wind field is established by using ANSYS Workbench software, and the two-way fluid-solid coupling analysis of waste plastic film under different wind conditions is carried out. The deformation law of waste plastic film under various wind force is obtained. Comparing the simulation results with the results of the virtual particle method, the applicability of the virtual particle method in solving the deformation of the separation film is verified. The method has the characteristics of small calculation and fast speed. (3) an experimental platform is built. The experimental scheme of separating waste plastic film was designed, and the wind separation experiment of waste plastic film in different states was carried out, and the function relationship between wind speed and position coordinate was obtained by fitting and processing the data by Matlab software. The method of measuring deformation based on high speed video camera is studied, and the error between the theoretical and experimental values of virtual particle method is obtained. It provides theoretical guidance for further simulation analysis of cyclone separator. (4) according to the conclusion of virtual particle method, simulation and experimental analysis, the cyclone separator for separating waste plastic film is optimized. The analysis model of cyclone separator is established by Solidworks software, and the working state of cyclone separator with different wind speed is simulated by fluent fluid analysis software. Through the analysis and study of the simulation results, the optimum wind speed of cyclone separator sorting is determined, and the structure size of cyclone separator is optimized.
【学位授予单位】：山东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X705

【参考文献】