基于分步模型环境风影响直空冷凝汽器换热的数值研究

Numerical study on the effects of wind on direct air-cooled condensers based on split-step model

环境风对直接空冷凝汽器的换热性能具有重要影响。以某300 MW直接空冷机组为例,建立了空冷岛和逐个空冷单元的分步数值分析模型。分析了环境风对不同位置空冷单元的影响规律,计算了环境风对空冷凝汽器换热量的影响。结果表明:位于空冷平台迎风侧和左右两侧的边缘空冷单元受环境风的影响最为严重。以9 m/s风速为例,最优风向的换热效率比最不利风向的换热效率高出18.4%,建筑物会影响空冷凝汽器的换热。

Wind is the main reason that affects the heat transfer performance of air-cooled condenser. A 300MW direct air-eooled unit is studied as an example, the split-step numerical models of the air cooling island and the air-cooled unit is Simulated in this paper. The influence of wind on the air-cooled condenser in different positions is studied, and the effect of wind on air-cooled condenser is analyzed, The results show that the air-cooled unit which is in the position of the windward side or the left and right sides of the air cooled platform is most seriously affected by the wind. Taking wind speed of 9 m/s for example, the heat exchange efficiency in optimal wind direction is 18.4 % higher than that in the worst wind direction. Buildings can affect the heat exchanging of the air-cooled condenser.