摘要
针对喷淋塔内烟气偏流影响烟气与下落液滴群热质交换的问题,构建并通过试验验证了喷淋塔内气液流动及余热回收理论模型,基于液滴自调整效应,运用CFD技术模拟研究4种喷淋层布置方式下余热回收喷淋塔的性能,获得了最佳喷淋方案及其喷淋参数。结果表明:与常规单层均匀喷淋方式相比,增设半层喷淋能够有效提升塔内烟气流动均匀性,塔内烟气均匀度由1降至0.3左右,喷淋塔全热交换效率最多可提升20%;半层喷淋最佳布置位置在烟气入口中心线上3 m处;综合考虑余热回收效果和运行成本,最佳喷淋液滴直径为0.6~0.8 mm,最佳水气比为5 kg/kg。构建的喷淋塔内烟气余热回收模型与提出的喷淋优化方法可为其特性分析、工艺优化、参数设计及运行提供理论指导。
For the problem of the flue gas flow deviation in the spray tower which affects the heat and mass exchange of the flue gas and falling liquid droplets,a theoretical model for gas-liquid flow and waste heat recovery in the spray tower was constructed,and some relevant experiments were verified.Based on the self-adjustment effect of liquid droplets,CFD technology was used to simulate the performance of the spray tower with four spray layer arrangements to obtain the best spray solution and its spray parameters.The results indicate that compared to the conventional single-layer uniform spraying method,the addition of halflayer spraying can effectively improve the uniformity of flue gas flow in the tower,the uniformity of flue gas in the tower is reduced from 1 to 0.3,and the total heat exchange efficiency of the spray tower can be improved by 20%.The best location for the halflayer spraying is 3 m above the center line of the flue gas inlet.By comprehensively considering the waste heat recovery effect and operating costs,the optimum spray droplet diameter is 0.6 mm to 0.8 mm and the optimum water to gas ratio is 5 kg/kg.The heat recovery model for flue gas in the spray tower and the proposed spray optimization method constructed can provide theoretical guidance for its characteristics analysis,process optimization,parameter design and operation.
作者
时国华
潘春江
赵玺灵
张世钢
付林
李增群
SHI Guohua;PAN Chunjiang;ZHAO Xiling;ZHANG Shigang;FU Lin;LI Zengqun(School of Energy and Mechanical Engineering,North China Electric Power University,Baoding 071003,China;School of Architecture,Tsinghua University,Beijing 100084,China;Beijing Qingjian Energy Technology Co.,Ltd.,Beijing 100085,China;Ice Wheel Environmental Technology Co.,Ltd.,Yantai 264002,China)
出处
《流体机械》
CSCD
北大核心
2024年第1期48-55,共8页
Fluid Machinery
基金
北京市科技计划项目(Z191100009119005)。
关键词
余热回收
喷淋塔
流场均匀性
数值模拟
waste heat recovery
spray tower
flow field uniformity
numerical simulation
