低风阻流线型导风板对自然通风湿式冷却塔的性能影响  

Effect of low wind resistance streamlined wind deflectors on performance of naturally ventilated wet cooling towers

作　　者：杨繁昌 刘江 王明勇[3] 翁培奋 张宇琪 YANG Fanchang;LIU Jiang;WANG Mingyong;WENG Peifen;ZHANG Yuqi(School of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 201306,China;Shanghai Engineering and Technology Research Center for Energy Saving of Heat Exchange Systems,Shanghai 200090,China;Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China)

机构地区：[1]上海电力大学能源与机械工程学院,上海201306 [2]上海热交换系统节能工程技术研究中心,上海200090 [3]西安热工研究院有限公司,陕西西安710054

出　　处：《热力发电》2024年第6期122-131,共10页Thermal Power Generation

基　　金：上海市2020年度“科技创新行动计划”社会发展科技攻关项目(20dz1205302)。

摘　　要：为改善冷却塔雨区流场结构,进一步增大通风量,在已有平板型导风板基础上,提出一种布置在雨区的低风阻流线型导风板。设计工况下,以常规冷却塔和在各高度布置平板型导风板的改造塔为参考对象,分析5种不同布置高度(1/6、1/3、1/2、2/3、5/6进风高度)下低风阻流线型导风板对整塔通风量、塔内流场结构和温度分布等参数的影响。结果表明:随着导风板布置高度的升高,塔内各区域的空气分配发生了变化,对内区填料换热产生了明显影响,使整塔冷却性能呈现出先提升后下降的趋势;在进风口高度2/3处布置流线型导风板时,通风量增量与填料区底部平均温度减量达到最优值,冷却塔性能改善效果最佳,此时相较于常规冷却塔,循环水温降相对增长2.65%,通风量相对增长2.78%。此外,相较于最佳布置高度的平板型导风板,采用低风阻流线型导风板改造后循环水温降相对增长1.2%。In order to improve the flow field structure of rain area in cooling tower and further increase the ventilation,on the basis of the existing flat plate type wind guide plate,this paper proposes a streamline wind guide plate with low wind resistance that can be arranged in the rain area.Under the design condition,by taking the conventional cooling tower and the reformed tower with flat plate-type air guide plate arranged at each height as the reference objects,the influences of the low wind resistance streamline air guide plate on ventilation,flow field structure and temperature distribution of the whole tower are analyzed,at five different arrangement heights(1/6,1/3,1/2,2/3,5/6 air intake height).The results show that,with the rise of the height of the air guide plate arrangement,the air distribution in each region of the tower has changed,which has a significant effect on the packing heat exchange in inner zone,so that the cooling performance of the whole tower improves at first and then declines.When arranging the streamlined wind guide plate at 2/3 height of the air inlet,the ventilation increment and the average temperature reduction at the bottom of the filler area reaches the optimal value,and the improvement effect of the cooling tower performance is the best.Compared with the conventional cooling tower,the circulating water temperature drop and the ventilation increases by 2.65%and 2.78%,respectively.In addition,the circulating water temperature drop increases by 1.2%after the tower is retrofitted with a low wind resistance streamlined air guide,compared with the flat plate with an optimal arrangement height.

关 键 词：自然通风湿式冷却塔 冷却性能 流线型导风板 数值计算 

分 类 号：TM621[电气工程—电力系统及自动化]