三产品旋流分级筛柱段流场仿真研究
发布时间：2018-12-19 12:17
【摘要】：三产品旋流分级筛作为一种高效的煤泥分级设备,在理论研究及工业应用中都取得了一些成果。论文针对三产品旋流分级筛的结构特点,探讨柱段流场以及筛网透筛过程,利用先进计算机技术,对三产品旋流分级筛透筛过程的进行仿真研究,并得到了相关结论,为今后三产品旋流分级筛的改进和优化提供宝贵经验。论文首先根据三产品旋流分级筛的结构特点及工作原理提出柱段筛网透筛过程假设,并对颗粒进行受力分析和运动分析,为后续研究奠定理论基础。然后,运用三维实体建模软件Solidworks建立三产品旋流分级筛流场物理模型,联合计算流体动力学软件FLUENT,完成三产品旋流分级筛仿真过程。最后,利用Tecploct对仿真结果分析。论文通过对三产品旋流分级筛连续相流场仿真分析,探讨了三产品旋流分级筛基本流动模型与水力旋流器异同。由于筛网的透筛作用使得其内部湍流作用远远小于水力旋流器,因此三产品旋流分级筛内速度和压力都小于水力旋流器内部速度和压力。连续相透筛过程主要诱导因素为筛网内外压差,特别是静压作用,切向速度对连续相透筛作用不明显。论文通过改变结构参数和操作参数对三产品旋流分级筛内部流场进行仿真分析。随着三产品旋流分级筛入口流量的增加,各个出口流量都有所增加,其中筛下流出口流量受入口流量变化影响较大,这是由于筛网内外压力差随着入口流量的增加呈指数型增长,从增加了连续相的透筛量。对结构参数进行三因素三水平的正交试验,三因素对筛下流流量的作用结果:中心管直径底流口直径筛缝宽度。论文通过在三产品旋流分级筛连续相中加入稀疏颗粒仿真分析,得到颗粒运动轨迹图,筛网内外压力差对颗粒透筛过程起主导作用。通过论文的研究,初步掌握了三产品旋流分级筛透筛过程,为该设备改进和优化以及获得良好的分级效率奠定了坚实基础。
[Abstract]:As an efficient coal slurry classifier, three-product swirl classifier has made some achievements in theoretical research and industrial application. In this paper, according to the structure characteristics of three-product swirl sieve, the flow field in column section and screening process of sieve screen are discussed. The simulation of three-product swirl classifying sieve is carried out by using advanced computer technology, and the relevant conclusions are obtained. It provides valuable experience for the improvement and optimization of the three-product swirl classifier in the future. Firstly, according to the structure characteristics and working principle of the three-product swirl sieve, the hypothesis of screening process is put forward, and the mechanical analysis and motion analysis of the particles are carried out, which lays a theoretical foundation for the subsequent research. Then, the physical model of three-product swirl classifier sieve is established by using three-dimensional solid modeling software Solidworks, and the simulation process of three-product swirl classifying sieve is completed by combined computational fluid dynamics software FLUENT,. Finally, the simulation results are analyzed by Tecploct. Through the simulation and analysis of the continuous phase flow field of the three-product swirl classifier, this paper discusses the similarities and differences between the basic flow model of the three-product swirl classifier and the hydrocyclone. Due to the sieve permeation, the internal turbulence effect is much smaller than that of hydrocyclone, so the velocity and pressure in the three-product swirl classifier are smaller than that in hydrocyclone. The main inductive factors of continuous phase permeation are the pressure difference inside and outside the screen, especially the static pressure, but the tangential velocity has no obvious effect on the continuous phase screening. In this paper, the internal flow field of the three-product swirl classifier is simulated and analyzed by changing the structure parameters and operation parameters. With the increase of the inlet flow rate of the three-product swirl classifier, the flow rate of each outlet is increased, among which the flow of the lower flow of the screen is greatly affected by the change of the inlet flow. This is because the pressure difference between inside and outside of the screen increases exponentially with the increase of inlet flow rate, and the amount of continuous phase permeation is increased. Three factors and three levels of orthogonal test were carried out on the structural parameters. The effect of three factors on the flow rate was as follows: the diameter of the center tube diameter and the width of the diameter of the sieve slot. In this paper, by adding sparse particles into the continuous phase of three-product swirl sieve, the particle motion trajectory is obtained, and the pressure difference between inside and outside of the screen plays a leading role in the process of particle permeation. Through the research of the paper, the process of three products swirl classifying sieve was preliminarily mastered, which laid a solid foundation for the improvement and optimization of the equipment and the good classification efficiency.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD94;TD452
本文编号：2386908
[Abstract]:As an efficient coal slurry classifier, three-product swirl classifier has made some achievements in theoretical research and industrial application. In this paper, according to the structure characteristics of three-product swirl sieve, the flow field in column section and screening process of sieve screen are discussed. The simulation of three-product swirl classifying sieve is carried out by using advanced computer technology, and the relevant conclusions are obtained. It provides valuable experience for the improvement and optimization of the three-product swirl classifier in the future. Firstly, according to the structure characteristics and working principle of the three-product swirl sieve, the hypothesis of screening process is put forward, and the mechanical analysis and motion analysis of the particles are carried out, which lays a theoretical foundation for the subsequent research. Then, the physical model of three-product swirl classifier sieve is established by using three-dimensional solid modeling software Solidworks, and the simulation process of three-product swirl classifying sieve is completed by combined computational fluid dynamics software FLUENT,. Finally, the simulation results are analyzed by Tecploct. Through the simulation and analysis of the continuous phase flow field of the three-product swirl classifier, this paper discusses the similarities and differences between the basic flow model of the three-product swirl classifier and the hydrocyclone. Due to the sieve permeation, the internal turbulence effect is much smaller than that of hydrocyclone, so the velocity and pressure in the three-product swirl classifier are smaller than that in hydrocyclone. The main inductive factors of continuous phase permeation are the pressure difference inside and outside the screen, especially the static pressure, but the tangential velocity has no obvious effect on the continuous phase screening. In this paper, the internal flow field of the three-product swirl classifier is simulated and analyzed by changing the structure parameters and operation parameters. With the increase of the inlet flow rate of the three-product swirl classifier, the flow rate of each outlet is increased, among which the flow of the lower flow of the screen is greatly affected by the change of the inlet flow. This is because the pressure difference between inside and outside of the screen increases exponentially with the increase of inlet flow rate, and the amount of continuous phase permeation is increased. Three factors and three levels of orthogonal test were carried out on the structural parameters. The effect of three factors on the flow rate was as follows: the diameter of the center tube diameter and the width of the diameter of the sieve slot. In this paper, by adding sparse particles into the continuous phase of three-product swirl sieve, the particle motion trajectory is obtained, and the pressure difference between inside and outside of the screen plays a leading role in the process of particle permeation. Through the research of the paper, the process of three products swirl classifying sieve was preliminarily mastered, which laid a solid foundation for the improvement and optimization of the equipment and the good classification efficiency.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD94;TD452
【参考文献】
相关期刊论文 前2条
1 倪晋仁,王光谦;泥石流的结构两相流模型:I.理论[J];地理学报;1998年01期
2 王志斌;陈文梅;褚良银;周先桃;黄维菊;王升贵;;旋流器流场的数值模拟及对流场特性的分析[J];四川大学学报(工程科学版);2006年03期
，本文编号：2386908
本文链接：https://www.wllwen.com/kejilunwen/kuangye/2386908.html
