三产品旋流分级筛柱段筛网流体透筛仿真研究

发布时间：2018-11-01 19:46

【摘要】：三产品旋流分级筛作为一种新型高效的细粒煤分级设备,具有非常重要的研究价值和应用前景。本文以三产品旋流分级筛的柱段流场为研究内容,重点分析柱段筛网不同筛缝宽度以及高度方向的流场、速度、压力、流量等分布变化规律,从而有利于完善旋流场分级理论,并且为三产品旋流分级筛的设备结构优化提供重要的理论意义以及现实意义。本文首先介绍了三产品旋流分级筛的主要结构组成部分,详细分析介绍了三产品旋流分级筛的工作原理以及内部流体主要运动形式,并在前人研究基础上对三产品旋流分级筛的透筛过程中柱段筛条“切割”作用和流场内部“压差”作用展开理论分析,同时,对三产品旋流分级筛内部运动的矿物颗粒具体径向受力情况做出介绍。本文通过对实际物理样机简化处理后,运用三维建模软件Solidworks建立三组不同筛缝宽度规格的三产品旋流分级筛流场模型,并进行了坐标约定。运用ANSYS ICEM软件对三组流场模型进行网格处理。将建立的网格模型导入到FLUENT中进行数值模拟的基本设置,并迭代计算得出三产品旋流分级筛内部流场信息。本文通过数值模拟的方法,以三产品旋流分级筛内部流体运动轨迹图为例,对内部流体运动形式展开分析介绍。在结构参数方面:通过改变筛缝宽度来分析三产品旋流分级筛内部柱段高度方向和径向压力场分布变化规律。随后给出不同筛缝宽度的三产品旋流分级筛柱段速度场分布规律,得出底流、溢流、筛下流的具体流量分布情况,并展开分析。在操作参数方面:通过改变入口流量分析三产品旋流分级筛内部压力场变化,并得出各出口流量分布情况。由不同入口流量与各出口流量分布关系表,对表格进行处理,得出各出口流量与入口流量关系分布图,并给出三产品旋流分级筛各出口流量与入口流量详细关系式。本文中筛缝宽度以及入口流量对柱段流场影响的研究成果为三产品旋流分级筛后续结构优化以及部分工艺参数的调整提供一定的指导意义。
[Abstract]:As a new type of high-efficient fine coal classification equipment, the three-product swirl classifier has very important research value and application prospect. In this paper, the flow field in the column section of the three-product swirl classifier is taken as the research content. The flow field, velocity, pressure and flow rate in different width and height direction of the sieve are analyzed, which is beneficial to the improvement of the theory of swirl flow field classification. It also provides important theoretical and practical significance for the optimization of the equipment structure of the three-product swirl classifier. In this paper, the main structure of the three-product swirl classifier is introduced, the working principle of the three-product swirl classifier and the main motion forms of the inner fluid are analyzed in detail. On the basis of previous studies, this paper makes a theoretical analysis of the "cutting" effect of the column sieve strip and the "pressure difference" effect within the flow field during the screening process of the three-product swirl classifier. At the same time, This paper introduces the radial force of mineral particles in the inner movement of the three-product swirl classifier. In this paper, after simplifying the physical prototype, three groups of three-product swirl classifying sieve flow field models with different sizes of sieve width are established by using three-dimensional modeling software Solidworks, and the coordinate agreement is carried out. Three sets of flow field models are processed by ANSYS ICEM software. The established grid model was imported into FLUENT to simulate the basic set of numerical simulation, and the internal flow field information of the three-product swirl graded sieve was calculated by iterative calculation. In this paper, by means of numerical simulation, the internal fluid motion pattern of three-product swirl classifier is taken as an example, and the internal fluid motion form is analyzed and introduced. In terms of structural parameters, the variation of height direction and radial pressure field in the inner column of the three-product swirl classifier is analyzed by changing the width of the sieve seam. Then the velocity field distribution law of three products swirl flow classifying column section with different width of sieve seam is given, and the specific flow distribution of bottom flow, overflow and sieve downflow is obtained, and the analysis is carried out. In terms of operating parameters, the internal pressure field of the three-product swirl classifier was analyzed by changing the inlet flow rate, and the flow distribution of each outlet was obtained. According to the distribution table of different inlet flow and outlet flow, the distribution diagram of each outlet flow and inlet flow is obtained, and the detailed relationship between each outlet flow and inlet flow of three-product swirl sieve is given. In this paper, the research results of the influence of the width of the sieve seam and the inlet flow rate on the flow field of the column section provide certain guiding significance for the subsequent structure optimization of the three-product swirl sieve and the adjustment of some technological parameters.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD452

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