烟气除湿喷淋塔出口液滴逃逸率研究  

Study on the droplets escaping from the outlet of flue gas dehumidification spray tower

作　　者：朱胜奎 朱群志 ZHU Shengkui;ZHU Qunzhi(College of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力大学能源与机械工程学院,上海200090

出　　处：《热科学与技术》2022年第4期322-328,共7页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51576119)。

摘　　要：为了降低火电厂烟气含湿量,以新型的上喷淋上进气喷淋塔为研究对象,采用FLUENT模型模拟喷淋塔内两相流体的运动,并与实验验证,采用单变量分析方法研究烟气流速、喷淋液滴直径、喷淋速度、喷淋流量四种因素对出口液滴逃逸率的影响。研究表明:操作条件对出口液滴逃逸率的影响程度液滴直径>进气速度>喷淋流量>喷淋速度;出口液滴逃逸率随着进气速度的增长而线性增长,喷淋流量和喷淋速度则反之;在进气速度3.5 m/s下,当液滴直径小于1.00 mm时,逃逸率随液滴直径减小而迅速上升;当直径大于1.00 mm时,液滴逃逸率几乎为0.0%,不受喷淋流量影响。To reduce the moisture content of flue gas in thermal power plants, the novel spray tower with upper gas inlet and upper spray was taken as the research object. The Fluent model was used to simulate the motion of the two-phase fluid inside the spray tower, and the model was verified experimentally. The effects of four factors, such as flue gas flow rate, spray droplet diameter, spray velocity and spray flow rate, on the escape rate of the outlet droplets were studied by univariate analysis. The results show that the influence degree of each operating condition on the droplet escape rate: droplet diameter > inlet velocity > spraying flowrate > spraying velocity. The droplet escape rate increases linearly with the increase of inlet velocity, while the effects of spraying flowrate and spraying velocity are opposite. At the inlet velocity of 3.5 m/s, when the droplet diameter is less than 1.00 mm, the escape rate increases rapidly as the droplet diameter decreases. When the droplet diameter is larger than 1.00 mm, the droplet escape rate is almost 0.0%, which is not affected by the spraying flowrate.

关 键 词：气液两相流 数值模拟 逃逸率 单变量分析 喷淋塔 

分 类 号：TM628[电气工程—电力系统及自动化]