风力扭振协同作用下振动螺旋床面上颗粒分层分带规律研究
发布时间：2019-06-11 22:11
【摘要】：论文以研究背景和意义为切入点,提出了“风力扭振协同作用下振动螺旋床面上颗粒分层分带规律研究”这一研究课题。综述了国内外干法选煤设备和技术的进展,总结了前人研究所取得的成果,以此为基础,介绍了离散元仿真软件EDEM、BP神经网络,同时建立了试验分选结果和分选参数的多因素非线性模型,首次将EDEM-Fluent耦合运用到对该设备的研究中去,旨在为振动螺旋干法分选机的结构参数优化和分选机理的研究提供帮助。论文首先通过建立振动螺旋干法分选机的动力学模型,推导得出垂直振幅和水平振幅的表达式,为后续仿真提供了理论指导;运用SolidWorks三维建模软件,建立振动螺旋干法分选机的三维模型;以物料颗粒原型为基础并结合研究需要,创建颗粒的三维模型,为后续仿真试验提供了准确的实体模型。根据EDEM内置的前处理模块、仿真求解模块、后处理模块的操作顺序,依次进行变量设置和操作步骤,完成振动螺旋干法分选的分选圈数单因素寻优、多因素仿真试验研究,得到后续主要结构参数的优化分析所需的数据图表等;在振动频率35Hz、分选圈数4圈、螺距T=350mm、β=5°的条件时,精煤带煤量为65.39%;运用MATLAB2012b建立振动频率、垂直振幅、水平振幅、螺距、径向倾角和分选结果之间的多元非线性模型,并得到相对应的多项式;最后运用ICEM软件对振动螺旋干法分选机进行网格划分,在EDEM中设置相应的颗粒相仿真参数,在Fluent设置流体参数,进行EDEM-Fluent耦合探究,发现风力的引入对于避免细颗粒的离析现象有着重要意义。在同等条件下完成了对振动频率和分选圈数的物理试验验证,仿真试验和物理试验结果在误差允许范围内,证明了仿真试验的可靠性;同时探究了激振力的大小对分选结果的影响,和振动螺旋干法分选机动力学模型中激振力的作用效果分析非常契合。
[Abstract]:Based on the research background and significance, this paper puts forward the research topic of "study on the stratification and zoning of particles on the vibrating spiral bed surface under the synergistic action of wind torsional vibration". The progress of dry coal preparation equipment and technology at home and abroad is reviewed, and the achievements of previous research are summarized. On the basis of this, the discrete element simulation software EDEM,BP neural network is introduced. At the same time, the multi-factor nonlinear model of the test separation results and separation parameters is established, and the EDEM-Fluent coupling is applied to the research of the equipment for the first time. The purpose of this paper is to provide help for the optimization of structural parameters and the study of separation mechanism of vibrating spiral dry separator. Firstly, the dynamic model of vibrating spiral dry separator is established, and the expressions of vertical amplitude and horizontal amplitude are derived, which provides theoretical guidance for subsequent simulation; the 3D model of vibrating spiral dry separator is established by using SolidWorks 3D modeling software; based on the prototype of material particles and combined with the research needs, the 3D model of particles is established, which provides an accurate solid model for the subsequent simulation experiment. According to the pre-processing module, the simulation solution module and the operation sequence of the post-processing module, the variable setting and operation steps are carried out in turn, the single factor optimization of the number of sorting rings in vibration spiral dry method is completed, the multi-factor simulation test is studied, and the data charts needed for the optimization analysis of the following main structural parameters are obtained. When the vibration frequency is 35Hz, the separation circle is 4 laps, and the pitch is T 鈮，
本文编号：2497488
[Abstract]:Based on the research background and significance, this paper puts forward the research topic of "study on the stratification and zoning of particles on the vibrating spiral bed surface under the synergistic action of wind torsional vibration". The progress of dry coal preparation equipment and technology at home and abroad is reviewed, and the achievements of previous research are summarized. On the basis of this, the discrete element simulation software EDEM,BP neural network is introduced. At the same time, the multi-factor nonlinear model of the test separation results and separation parameters is established, and the EDEM-Fluent coupling is applied to the research of the equipment for the first time. The purpose of this paper is to provide help for the optimization of structural parameters and the study of separation mechanism of vibrating spiral dry separator. Firstly, the dynamic model of vibrating spiral dry separator is established, and the expressions of vertical amplitude and horizontal amplitude are derived, which provides theoretical guidance for subsequent simulation; the 3D model of vibrating spiral dry separator is established by using SolidWorks 3D modeling software; based on the prototype of material particles and combined with the research needs, the 3D model of particles is established, which provides an accurate solid model for the subsequent simulation experiment. According to the pre-processing module, the simulation solution module and the operation sequence of the post-processing module, the variable setting and operation steps are carried out in turn, the single factor optimization of the number of sorting rings in vibration spiral dry method is completed, the multi-factor simulation test is studied, and the data charts needed for the optimization analysis of the following main structural parameters are obtained. When the vibration frequency is 35Hz, the separation circle is 4 laps, and the pitch is T 鈮，
本文编号：2497488
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