侧风下逆流湿式冷却塔优化进风的实验研究  

Experimental Study on Optimizing Inlet Airflow of Wet Cooling Towers Under Crosswinds

作　　者：陈友良[1] 高明[1] 赵元宾[1] 史月涛[1] 孙奉仲[1] 

机构地区：[1]山东大学能源与动力工程学院,山东省济南市250061

出　　处：《中国电机工程学报》2012年第23期48-54,149,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51106092);山东省自主创新成果转化重大专项(2010ZHZX1A0910)~~

摘　　要：为降低侧风对自然通风逆流湿式冷却塔进风的不利影响,引入一种优化进风的新方法——在进风口周向上安装导风板,同时,为定量分析冷却塔周向进风均匀性,定义进风均匀系数。基于热态模型实验,研究侧风工况下安装导风板对湿式冷却塔进风及热力性能的影响。通过对进风性能及冷却效率的对比分析,揭示了侧风影响冷却性能的2个根本原因:侧风不仅降低了通风量,还破坏了冷却塔周向进风的均匀性,冷却效率的降低是二者共同作用的结果。安装导风板对周向进风进行优化之后,通风量增大,进风均匀系数也有较大提高,塔内传热传质均匀性增强,冷却效率有较大提升。刘易斯因子分析表明,优化进风对传热的强化作用更大,但同时增加了绝对蒸发水损失。A new approach of installing air deflectors around tower inlet circumferentially was proposed to optimize the inlet airflow and reduce the adverse effect of crosswinds on the thermal performance of natural draft wet cooling towers （NDWCT）. And inlet airflow uniformity coefficient was defined to analyze the uniformity of circumferential inlet airflow quantitatively. Then the effect of air deflectors on the NDWCT performance was investigated experimentally. By contrast between inlet air flow rate and cooling efficiency, it has been found that crosswinds not only decrease the inlet air flow rate, but also reduce the uniformity of inlet airflow, which reduce NDWCT performance jointly. After installing air deflectors, the inlet air flow rate and uniformity coefficient increase, the uniformity of heat and mass transfer increases correspondingly, which improve the cooling performance. In addition, analysis on Lewis factor demonstrates that the inlet airflow optimization has more enhancement of heat transfer than mass transfer, but leads to more water evaporation loss.

关 键 词：冷却塔 侧风 优化 导风板 进风均匀系数 热态实验 

分 类 号：TK124[动力工程及工程热物理—工程热物理]