水力旋流器对含油污水分离.rar

摘要

水力旋流器利用离心力场进行高效旋流分离，优于重力分离设备，其内部流场相当复杂且多变，其流场在极短的时间内，经历了由切向入口管的一维流动至沿分离器内壁的三维强旋转流动的迅速转变，这使得旋流器的流场数值模拟和实验测量变得复杂。本文采用了FLUENT软件中的雷诺应力模型(RSM)，对旋流器内部的这种复杂湍流运动进行了数值模拟分析，利用分块网格技术对模型进行了六面体网格划分，对旋流器内单相流动进行了数值模拟计算，根据计算结果分析了旋流器内三维速度分布规律，得到了旋流器内不同截面的压力、速度分布，并对水力旋流器内不同直径的颗粒所形成的多相流流场随时间变化的分离过程进行了三维数值模拟，得到了旋流器内直径不同的颗粒在旋流分离时追随性的分布状况。数值计算的结果与前人的实验及理论结果相互印证，并对旋流器的进一步研究具有指导意义。

本文对于油污水分离所用的旋流器还进行了不同结构形式对比研究，分别进行了双切向入口型、双锥段型及细长锥型的模拟分析，分析结果表明，双细长锥型旋流器对于密度差异不大的油水两相分离时，其分离效果要优于其他两种结构形式，同时，双切向入口型的旋流器内流场的稳定性及对称性最好。不同结构形式的旋流场具有双螺旋结构特征，旋流器内部的压力损失主要是集中在溢流管下端附近区域内，为了提高分离效率减少湍流，可采用对称双切向入口结构以减小循环流和短路流，对减小能量损耗具有较强的实际意义。

对固液分离型旋流器搭建了实验模拟系统，设计了实验方案，为进一步确定旋流器操作参数的最佳配比提供依据，同时对新型旋流器的开发及实验研究具有实际意义。




关键词：水力旋流器， 雷诺应力模型， 两相流， 细长锥型


 


 


 


 


 

Abstract

Hydrocyclones use centrifugal force field for efficient cyclone separation, it is better than gravity separation equipment. Its internal flow field very complex and varied, the flow field can be turned to along the inner wall of separation between the three-dimensional flow and strong rapid changes in rotation from the tangential inlet of the one-dimensional flow in a very short period of time, which makes the cyclone flow field numerical simulation and experimental measurement becoming more complex. In this paper, by use of FLUENT software and the Reynolds Stress Model (RSM), on the cyclone internal turbulence of this complexity a numerical simulation analysis, by use of sub-block grid on the model of the hexahedral mesh of the cyclone single-phase flow inside a numerical simulation, according to the calculation results of the cyclone, analyzed the three-dimensional velocity distribution, obtained within the different sections of the cyclone pressure, velocity, and different diameter of particles changes with time separation process in the multiphase flow field. Three-dimensional numerical simulation results show the different diameter of the particles follow characteristic distribution in cyclone. Numerical results with the experimental and theoretical results are the same, also are instructive to further study of cyclone.

Comparative study of different structural forms in oil-water separator for cyclone, included the dual tangential inlet type, double cone type and slender tapered type.The results show that when the density is insignificant for the oil-water two-phase ,slender tapered cyclone separation efficiency is better than the other two structural forms.meanwhile, the dual tangential inlet cyclone-type flow field stability and symmetry is the best.Different structural forms of cyclone field with double-helix structure, pressure loss inside the cyclone is mainly concentrated in the area near the bottom of the overflow pipe, in order to improve the separation efficiency and reduce turbulence, symmetrical double tangential inlet structure can be used to reduce the cycle flow and short circuit flow, which has a strong practical significance to reduced the energy loss.

In order to study the solid-liquid separation in cyclone, an experimental simulation system is built and also designed experimental program, for determine the cyclone operating parameters provide the basis for the best ratio, which has practical significance to study the new type hydrocyclone.




Keywords: hydrocyclone, Reynolds stress model, two-phase flow, slender cone




 

目录

摘要……………………………………………………………………………………………………I

Abstract ………………………………………………………………………………………………

第一章  绪论 ……………………………………………………………………………1

1.1研究背景……………………………………………………………………………………1

1.2水力旋流器的基本结构及分离原理…..………………………………………………2

1.2.1水力旋流器的基本结构……………………………………………………….2

1.2.2水力旋流器的分离原理……………………………………………………… 3

1.3水力旋流器的优缺点……………………………………………………………………4

1.4国内外研究现状………………………………………………………………………… 4

1.5本课题的研究内容…………………………………………..