摘要
以某2×600 MW直接空冷机组为例,利用CFD软件对其空冷岛外部流场进行数值模拟。通过数值模拟,分析计算了三种不同位置加装下挡风墙对直接空冷凝汽器风机风量的影响。在风速大于7 m/s时,空冷凝汽器换热效率的降低是热风回流与"倒灌"现象综合作用的结果,加装曲面下挡风墙可以有效改善空冷凝汽器风机换热效果。结果表明,最佳下挡风墙安装方案为安装在第一排风机后,此时的风机风量达到最大,换热效果最好。为空冷岛换热效果的优化提供了理论依据。
The numerical simulation of the external flow filed of the air-cooled island was made with CFD for a 2×600 MW direct air-cooled unit. By numerical simulation, calculated the effects of three different wind wall position under the direct air-cooled condenser fan flow effects. In the wind speed is greater than 7 m/s, the air cooled con- denser is the hot air reduces heat transfer efficiency of the back with the ＂intrusion＂ the result of combined effects of the phenomenon, exhaust fan installed in the first wall surface under the wind and air-cooled condenser can be improved Fan effect of heat transfer. The optimum position of the downdraught is after the first exhaust fans, then the maximum air volume of fan and heat exchanger become the best results. The research results provide some theo- ry evidence for the optimization of the effect of air-cooled island＇s heat transfer.
出处
《电力科学与工程》
2012年第3期51-55,共5页
Electric Power Science and Engineering
关键词
空冷岛
热风回流
倒灌
下挡风墙
数值模拟
air-cooled island
hot air recirculation
downdraught
lower windbreak
numerical simulation
