【摘要】：三產(chǎn)品旋流分級(jí)篩作為一種高效的煤泥分級(jí)設(shè)備,在理論研究及工業(yè)應(yīng)用中都取得了一些成果。論文針對(duì)三產(chǎn)品旋流分級(jí)篩的結(jié)構(gòu)特點(diǎn),探討柱段流場(chǎng)以及篩網(wǎng)透篩過(guò)程,利用先進(jìn)計(jì)算機(jī)技術(shù),對(duì)三產(chǎn)品旋流分級(jí)篩透篩過(guò)程的進(jìn)行仿真研究,并得到了相關(guān)結(jié)論,為今后三產(chǎn)品旋流分級(jí)篩的改進(jìn)和優(yōu)化提供寶貴經(jīng)驗(yàn)。論文首先根據(jù)三產(chǎn)品旋流分級(jí)篩的結(jié)構(gòu)特點(diǎn)及工作原理提出柱段篩網(wǎng)透篩過(guò)程假設(shè),并對(duì)顆粒進(jìn)行受力分析和運(yùn)動(dòng)分析,為后續(xù)研究奠定理論基礎(chǔ)。然后,運(yùn)用三維實(shí)體建模軟件Solidworks建立三產(chǎn)品旋流分級(jí)篩流場(chǎng)物理模型,聯(lián)合計(jì)算流體動(dòng)力學(xué)軟件FLUENT,完成三產(chǎn)品旋流分級(jí)篩仿真過(guò)程。最后,利用Tecploct對(duì)仿真結(jié)果分析。論文通過(guò)對(duì)三產(chǎn)品旋流分級(jí)篩連續(xù)相流場(chǎng)仿真分析,探討了三產(chǎn)品旋流分級(jí)篩基本流動(dòng)模型與水力旋流器異同。由于篩網(wǎng)的透篩作用使得其內(nèi)部湍流作用遠(yuǎn)遠(yuǎn)小于水力旋流器,因此三產(chǎn)品旋流分級(jí)篩內(nèi)速度和壓力都小于水力旋流器內(nèi)部速度和壓力。連續(xù)相透篩過(guò)程主要誘導(dǎo)因素為篩網(wǎng)內(nèi)外壓差,特別是靜壓作用,切向速度對(duì)連續(xù)相透篩作用不明顯。論文通過(guò)改變結(jié)構(gòu)參數(shù)和操作參數(shù)對(duì)三產(chǎn)品旋流分級(jí)篩內(nèi)部流場(chǎng)進(jìn)行仿真分析。隨著三產(chǎn)品旋流分級(jí)篩入口流量的增加,各個(gè)出口流量都有所增加,其中篩下流出口流量受入口流量變化影響較大,這是由于篩網(wǎng)內(nèi)外壓力差隨著入口流量的增加呈指數(shù)型增長(zhǎng),從增加了連續(xù)相的透篩量。對(duì)結(jié)構(gòu)參數(shù)進(jìn)行三因素三水平的正交試驗(yàn),三因素對(duì)篩下流流量的作用結(jié)果:中心管直徑底流口直徑篩縫寬度。論文通過(guò)在三產(chǎn)品旋流分級(jí)篩連續(xù)相中加入稀疏顆粒仿真分析,得到顆粒運(yùn)動(dòng)軌跡圖,篩網(wǎng)內(nèi)外壓力差對(duì)顆粒透篩過(guò)程起主導(dǎo)作用。通過(guò)論文的研究,初步掌握了三產(chǎn)品旋流分級(jí)篩透篩過(guò)程,為該設(shè)備改進(jìn)和優(yōu)化以及獲得良好的分級(jí)效率奠定了堅(jiān)實(shí)基礎(chǔ)。
[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.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD94;TD452

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 倪晉仁,王光謙;泥石流的結(jié)構(gòu)兩相流模型:I.理論[J];地理學(xué)報(bào);1998年01期

2 王志斌;陳文梅;褚良銀;周先桃;黃維菊;王升貴;;旋流器流場(chǎng)的數(shù)值模擬及對(duì)流場(chǎng)特性的分析[J];四川大學(xué)學(xué)報(bào)(工程科學(xué)版);2006年03期

，

本文編號(hào)：2386908