防止500 kV地下变电站出风井白雾的产生

500 kV静安地下变电站采用闭式喷淋冷却塔的循环冷却系统,当环境温度低或空气湿度较高的时候,冷却塔排出的热气容易在出风井附近产生白雾,对周围环境有一定的影响.分析白雾产生的机理：站内冷却系统主要为油浸主设备进行冷却,热量由冷却塔排出室外,在雨季、冬季的时候,当环境温度较低或湿度较高时,冷却塔排出的热、湿空气被外界冷空气冷却,冷凝成水珠,形成白雾。经分析,只要将冷却塔内加装吸热模块,将排除的空气再次加热,将温度提高,排出的湿、热空气与外界空气在焓湿图上的混合线正好与饱和湿度线相切,避开饱和区域,使排出的空气不产生白雾。运行情况表明：该方法不仅能够消除白雾,而且节能环保.

Research on rime fog preventing of upcast air shaft for 500 kV underground substation

The circulating cooling system,which is under the ground,in 500kV Jing＇an underground substation is a closed spray cooling tower.When the temperature is low or humidity is high,the hot-gas fuming off by cooling tower will turn to rime fog around the upcast air shaft,which will affect the surrounding environment.This paper analyzes the reason for rime fog and introduces the cooling system.An energy conservation scheme is proposed to preventing the rime fog.The operation results show that the developed method is effective with energy conservation.