湿法烟气脱硫塔内折形板除雾器优化的数值模拟  

Numerical Simulation for Optimizing Flow Field of Vane-type Mist Eliminator in Wet Flue Gas Desulfurization Tower

作　　者：杨玮 曲江源 齐娜娜[2,3] 任杰 王瑞 杨凤玲[2,4] 张锴[2,3] 

机构地区：[1]晋能长治热电有限公司,山西长治046011 [2]山西省煤炭清洁燃烧发电工程技术研究中心(筹),山西太原030006 [3]华北电力大学热电生产过程污染物监测与控制北京市重点实验室,北京102206 [4]山西大学资源与环境工程研究所,山西太原030006

出　　处：《电力科学与工程》2017年第7期43-51,共9页Electric Power Science and Engineering

基　　金：山西省科技重大专项项目(MD2015-01)

摘　　要：采用欧拉-拉格朗日方法模拟了湿法烟气脱硫塔内折形板除雾器单通道二维流场的气液两相流动特性,气相采用SST k-ω模型封闭的雷诺时均N-S方程,液滴采用颗粒随机轨道模型。在对无构件除雾器流场分析基础上,提出一种加装于除雾器叶片的构件,并分析了优化构件高度及顶角对气相流动特性、液滴运动轨迹及除雾器性能的影响。模拟结果表明,所提出的新型构件可增强除雾器的捕集性能,构件高度由3mm增大至5 mm或顶角由120°减小至60°均可进一步提高除雾效率,而高度的影响比顶角更加明显;综合考虑除雾效率与压降,对于高度为3mm或4mm的构件顶角适宜范围为90°至120°,而对于高度为5mm的构件,顶角减小使压降增加明显,其适宜角度为120°。The two-dimensional gas-liquid flow characteristics in the single channel between two vanes of the mist elim- inator in Wet Flue Gas Desulfurization system aresimulated in this paper. The Eulerian-Lagrangian approach is applied, and the slurry droplets are calculated by Discrete Random Walk model, and the gas phase is treated by the Reynolds- averaged N-S equations together with Shear Stress Transport （SST） k-ω turbulence model. Based on hydrodynamics characteristics of two-phase flow field in the mist eliminator, a kind of component installedon the vanes of the demisteris proposed. The influencesof the height and apex angle of the newly installed component on the gas flow, droplet trajec- tories and trapping performance have been investigated. The simulation results indicate that the trapping performance of the mist eliminator can be enhanced by introducing a desired component. An increase of theheight from 3 mm to 5 mm or a decrease of the apex angle from 120° to 60°could improve the removal efficiency of mist eliminators. Furthermore,the height of the componenthas a significant influence on the performance of demister while apex angle plays a relatively irrelevant role. Taking both thedroplet removal efficiency and pressure drop into consideration, the apex angle ranging- from 90°to 120°is appropriatefor the componentin height of 3mm and 4mm, whilst the angle which has great effect on the pressure drop should select as 120°with regard to the componentin height of 5 mm.

关 键 词：湿法烟气脱硫 除雾器 数值模拟 结构优化 除雾效率 

分 类 号：X701.3[环境科学与工程—环境工程]