自然通风湿式冷却塔外围配水运行方式模拟研究  

Numerical Simulation of Natural Draft Wet Cooling Tower With Peripheral Water Distribution

作　　者：王锁斌 邓彤天 钟晶亮 李翔 李枝林 李晨宇 Wang Suobin;Deng Tongtian;Zhong Jingliang;Li Xiang;Li Zhilin;Li Yuchen(Electric Power Research Institute of guizhou power grid co.LTD,Guiyang Guizhou 550002;Energy Resources and Engineering College,Northeast Electric Power University,Jilin Jilin 132012)

机构地区：[1]贵州电网有限责任公司电力科学研究院,贵州贵阳550002 [2]东北电力大学能源与动力工程学院,吉林吉林132012

出　　处：《东北电力大学学报》2021年第5期60-67,共8页Journal of Northeast Electric Power University

基　　金：贵州电网科技项目(GZ2015-2-0089)。

摘　　要：为研究板式换自然通风湿式冷却塔合理的分区配水的运行,可以提高冷却塔的冷却性能,而外围配水作为一种特殊的分区配水方式,常被应用于低循环水量工况和冷却塔防冻方面.文中结合工程实例,以分区配水原理和外围配水的热力特性为切入点,首先对冷却塔在夏季低循环水量工况下外围配水运行方式进行了模拟研究,经研究发现,与全塔配水相比,由于其淋水密度的升高和有效通风量的下降,出塔水温升高1℃左右.然后根据外围配水冷却塔的热流特性,提出了扩大配水面积和加装挡风板两种优化方法.经研究发现,扩大配水面积可以使淋水密度下降到较为合理的水平,而加装挡风板可以提升有效通风量,均可以提升冷却塔的冷却能力,当外围配水宽度为0.7 R、加装挡风板后冷却塔的出塔水温与全塔配水相比,下降0.43℃.为实际运行和设计工作提供参考.The cooling performance of natural draft wet cooling tower can be improved by proper water distribution. As a special way of water distribution,peripheral water distribution has a better performance in low circulating water flow condition and anti-freezing. On the basis of partition the basic principle of water distribution and thermal characteristics of peripheral water distribution,the low cycle water flow rate and peripheral water distribution condition in summer is simulated,which is combining with engineering case. The study found that compared with the whole water distribution,the tower outlet water temperatures increased about 1 ℃ because of the higher water spray density and the lower effective ventilation rate. Then according to the heat transfer characteristics of peripheral water cooling tower,the expansion of water distribution area and add wind deflector were proposed. The study found that expansion of water distribution area can make water-spraying density drops to a reasonable level,and equipped with wind deflector can promote effective ventilation rate. When peripheral water distribution width of 0. 7 R,the cooling tower after adding wind deflector compared with the whole tower water distribution,tower outlet water temperature drop of 0. 43 ℃. Provide reference for actual operation and design work.

关 键 词：冷却塔 分区配水 外围配水 淋水密度 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TM611.3[动力工程及工程热物理—热能工程]