摘要
湿法脱硫技术的广泛使用将脱硫效率提高到90%以上,但脱硫后烟气含湿量大,增加了雾霾和微细颗粒物形成的可能性。以喷淋塔作为研究对象,基于Fluent软件对塔内的气液两相流场进行了三维稳态数值模拟。结果表明:喷淋液滴粒径对烟气冷凝除湿具有关键作用,液滴粒径越小,气液两相接触面积越大,换热效果越明显,当液滴粒径小于700μm时,烟气温降可达到6 K以上;当入口烟气温度为319~335 K时,所引起的冷凝水量的比值基本不变;喷淋液滴速度对烟气流场具有整合作用,选择合适的液滴速度可减小烟气回流区、提高塔内空间利用率,当液滴速度增加至40 m/s时,出口烟气温降可提升1.9 K左右。
The wide application of wet desulfurization technology makes the desulfurization efficiency reach more than 90%,but the high moisture content of flue gas after desulfurization increases the possibility of smog formation.The spray tower was the main body of research,and the threedimensional steady-state numerical simulation of gas-liquid two-phase flow field in the tower was carried out based on Fluent software.The results show that the spray droplet diameter plays a key role in flue gas condensation and dehumidification.The smaller the droplet diameter,the larger the gas-liquid two-phase contact area,the more obvious the heat transfer effect.If the droplet diameter is less than 700μm,the flue gas temperature drop above 6 K can be achieved.When the inlet flue gas temperature is in the range of 319-335 K,the ratio of condensed water caused by this temperature is basically unchanged.The spray droplet velocity has an integration effect on the flue gas flow field.Choosing the appropriate droplet velocity can reduce the flue gas reflux area,and improve the space utilization rate in the tower.When the droplet velocity increases to 40 m/s,the temperature drop of outlet flue gas can increase by about 1.9 K.
作者
刘文斌
李璐璐
李晓金
姚宣
杨海瑞
LIU Wenbin;LI Lulu;LI Xiaojin;YAO Xuan;YANG Hairui(Beijing Guodian Longyuan Environmental Engineering Co.,Ltd.,Haidian District,Beijing 100039,China;College of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi Province,China;State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment(Department of Energy and Power Engineering,Tsinghua University),Haidian District,Beijing 100084,China)
出处
《发电技术》
CSCD
2023年第1期107-114,共8页
Power Generation Technology
基金
国家重点研发计划项目(2019YFE0102100)。
关键词
湿法烟气脱硫
喷淋塔
气液两相流
除湿
三维稳态数值模拟
wet flue gas desulfurization
spray tower
gas-liquid two-phase flow
dehumidification
three-dimensional steady state numerical simulation
