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针对我国北方冬季湿式冷却塔运行时填料下表面、进风口以及基环面等处容易结冰的问题,在冷却塔的进风口处加装挡风板,建立了冷却塔内的传热传质模型,并采用CFD软件模拟和分析了在不同横向风速和不同环境温度下加装不同层数的挡风板时冷却塔的热力特性.结果表明:在风速小于4m/s时,塔内的迎风面空气温度较低,极易结冰;随着风速的增大,低温区逐渐向背风侧转移;当风速为8m/s,环境温度分别为-10℃、-17℃、-23℃时,分别在冷却塔内加装1层、3层和5层挡风板,能大大改善塔内温度场,有效防止塔内结冰.
Aiming at the problem that the bottom surface, air inlet and base ring of ice pack in the northern winter wet cooling tower are easy to freeze, a wind deflector is installed at the air inlet of the cooling tower to establish the heat and mass transfer in the cooling tower Model and the CFD software was used to simulate and analyze the thermal characteristics of the cooling tower with different levels of wind deflector at different lateral wind speeds and different ambient temperatures.The results show that when the wind speed is less than 4m / When the wind speed is 8m / s and the ambient temperature is -10 ℃, -17 ℃ and -23 ℃, the air temperature is low, Respectively, in the cooling tower to install 1, 3 and 5 layers of wind deflector, can greatly improve the tower temperature field, effectively prevent the tower ice.