波形板气液分离器的数值模拟

发布时间：2018-06-28 01:28

本文选题：波形板气液分离器 + 湍流效应　；参考：《华中科技大学》2014年硕士论文

【摘要】：气液分离技术广泛地应用于诸多能源、电力及工业领域。要想实现清洁能源利用、节能减排、能源高效利用等能源战略核心，安全、经济、高效、稳定的气液分离技术是必然的选择。结构紧凑、体积小、分离效率高是波形板气液分离的优点，因此，本文针对波形板气液分离器进行了数值模拟研究与分析。波形板气液分离器结构复杂，，包含有汽、液两相和三个流场(气流相、液滴相、液膜相)。在微观层面，对液滴相的特性、液滴的沉降、液滴的二次携带机理进行了全面的分析；在宏观层面，通过数值模拟分析了考察液滴粒径、汽流场的速度对波形板气液分离器的分离性能的影响。本文采用两相三流场模型来分析两相三流场的特性。运用Fluent6.3中的k湍流模型模拟出复杂结构波形板内气流运动特征，在此基础上，通过欧拉-拉格朗日多相流模型来模拟离散相在其流场中运动特征。离散相的湍动能与湍流效应的分析能更好地用来研究不同液滴直径、气流场速度下的分离效率。本文分别对三菱、西屋两类波形进行了数值模拟分析，从分离效率和压降这两个关键因素对波形板的结构形式进行数值分析，模拟结果发现不同结果形式的波形板对不同粒径颗粒群的捕获存在突变区间且不一样，其中，三菱单钩波形的区间值最小为4~7μ m。同时，引入Wall-film模型对所形成的板壁液膜进行了数值模拟和分析，考察了液膜对四种波形板压降的影响。在大曲率的情况下，液膜破裂的数值分析得到了回旋汽流与主流场的共同作用是形成带状薄膜破裂是一个不可忽视的因素。以上内容对今后波形板的实验研究和结构优化具有指导性意义。
[Abstract]:Gas-liquid separation technology is widely used in many fields of energy, power and industry. In order to realize clean energy utilization, energy saving and emission reduction, energy efficient utilization and other energy strategic core, safe, economic, efficient and stable gas-liquid separation technology is the inevitable choice. Compact structure, small volume and high separation efficiency are the advantages of gas-liquid separation with corrugated plate. Therefore, the numerical simulation and analysis of the gas-liquid separator with corrugated plate are carried out in this paper. The structure of the gas-liquid separator is complex, which includes vapor, liquid two-phase and three flow fields (airflow phase, droplet phase, liquid-film phase). At the micro level, the characteristics of the droplet phase, the deposition of the droplet, the mechanism of the secondary carrying of the droplet are comprehensively analyzed, and at the macroscopic level, the particle size of the droplet is investigated by numerical simulation. The influence of the velocity of steam flow field on the separation performance of the gas-liquid separator with waveform plate. In this paper, the characteristics of two-phase and three-flow field are analyzed by using two-phase and three-flow field model. Based on the k turbulence model in Fluent 6.3, the characteristics of the flow in the complex structure are simulated. Based on this, the characteristics of the discrete phase in the flow field are simulated by Euler-Lagrangian multiphase flow model. The analysis of turbulent kinetic energy and turbulent effect of discrete phase can be used to study the separation efficiency of different droplet diameter and flow field velocity. In this paper, two kinds of waveforms, Mitsubishi and Westinghouse, are numerically simulated and analyzed respectively, and the structural form of the waveform plate is numerically analyzed from the two key factors of separation efficiency and pressure drop. The simulation results show that there is a catastrophe interval in the capture of different particle groups with different waveforms, and the minimum value of Mitsubishi single hook waveform is 4 ~ 7 渭 m. At the same time, the Wall-film model is introduced to simulate and analyze the liquid film, and the effect of the film on the pressure drop of four kinds of wavy plates is investigated. In the case of large curvature, the numerical analysis of liquid film rupture shows that the interaction between gyrosteam flow and mainstream field is a factor which can not be ignored. The above contents are instructive to the experimental research and structure optimization of the waveform board in the future.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB657.7

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