间接空冷系统空冷散热器运行特性的数值模拟

以某6×1000 MW间接空冷电厂主要建筑物和空冷塔平面布局为例,通过CFD模拟,得到了冷却空气流场、温度场,分析了机组热负荷、环境气温、风速、风向对空冷散热器进口空气流速的影响.结果表明:处于环境风上游的空冷散热器单元,其迎面风速最大,空气温度最低,冷却效果最好;而处于侧面的空冷散热器单元,迎面风速最小,空气温度最高,冷却效果最差.随机组热负荷增加,空冷散热器冷却空气流量增加,随环境气温、风速增加,空冷散热器冷却空气流量减小.风向的改变也会影响散热器的运行特性.

Numerical Simulation of Operation Characteristics for Air-cooled Radiator in Indirect Air Cooling System

Based on the layout of the power plant's main buildings and air cooling towers of a typical MW indirect air cooling sets,the flow and temperature fields of the cooling air were presented by CFD simulation.The influences of the set's heat load,ambient temperature,wind speed and direction upon the inlet air velocity of air-cooled radiator were investigated.The results show that the windward air velocity is the highest and the cooling air temperature is the lowest,thus the cooling effect is the best for the air-cooled radiator units locating in the upward of the wind.However,for the side air-cooled radiator units the windward air velocity is the lowest and the cooling air temperature is the highest,thus the cooling effect is the worst.The flow rate of the cooling air of the air-cooled radiator increases with the set's heat load increasing and decreases with the ambient temperature and wind speed increasing.The operation characteristics of air-cooled radiator are also affected by the wind directions.