600 MW机组冷却塔防冻及防侧风一体化研究

Research on Integration of Anti-freezing and Anti-crosswindof Cooling Tower of 600 MW Unit

以北方某600 MW机组的自然通风冷却塔为研究对象,设计了一种新型进风装置,通过数值模拟的方法研究了该装置在不同季节环境下对冷却塔热力性能的影响。研究结果表明:在冬季,当风速为1.5 m/s,环境温度分别为266.15 K、261.15 K与258.15 K时,进风装置需要悬挂的挡风板层数分别为1、4与5,防止了塔底结冰的情况出现;在其他季节,将挡风板调节成具有导流效果的结构来防止侧风问题,可有效降低冷却塔的出塔水温,当环境温度为11℃时,进风装置的降温效果达到最佳。

Taking the natural ventilation cooling tower of a 600 MW unit in northern China as the research object,a new type of air inlet device is designed.The influence of the device on the thermal performance of the cooling tower under different environmental conditions in different seasonsis studied by numerical simulation.The results show that in winter,it can prevent icing at the bottom of the towerwhen the ambient temperature is 266.15 K,261.15 K and 258.15 K respectively under the 1.5 m/s wind speed,the number of layers of air baffle to be hung by the air intake device is 1,4 and 5 respectively.In other season,adjusting the wind deflector into a diversion structureto prevent crosswind problems can effectively reduce the cooling tower's exit tower water temperature,and the cooling effect of the air inlet device is the best when the ambient temperature is 11℃.