CAJ | 학술논문

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.
침대아국북방동계습식냉각탑운행시전료하표면、진풍구이급기배면등처용역결빙적문제,재냉각탑적진풍구처가장당풍판,건립료냉각탑내적전열전질모형,병채용CFD연건모의화분석료재불동횡향풍속화불동배경온도하가장불동층수적당풍판시냉각탑적열력특성.결과표명：재풍속소우4m/s시,탑내적영풍면공기온도교저,겁역결빙;수착풍속적증대,저온구축점향배풍측전이;당풍속위8m/s,배경온도분별위-10℃、-17℃、-23℃시,분별재냉각탑내가장1층、3층화5층당풍판,능대대개선탑내온도장,유효방지탑내결빙.
To solve the icing problems in wet cooling towers at areas such as the bottom surface of filler,air inlet and base torus in winter in north China,windshield boards are generally installed at the air inlet.Based on a newly-built heat and mass transfer model,CFD simulation and analysis have been performed to study the thermal performance of a wet cooling tower installed with different layers of windshield board at different horizontal wind speeds and environmental temperatures.Results show that when the wind speed is lower than 4m/s,the temperature will be relatively low at areas facing the wind in the tower,where icing troubles easily occur;with the rise of wind speed,the low-temperature zone generally moves to the leeward side;at a wind speed of 8 m/s,as environmental temperatures at-10 ℃,-17 ℃,-23 ℃,the optimal layers of windshield to be installed in the tower are believed to be 1,3 and 5 respectively,which effectively help to improve the temperature field in the tower and prevent the tower from being frozen.