环境风场影响下,电站直接空冷系统热风回流加剧,传热性能恶化。掌握风场作用下直接空冷系统热风回流率的空间分布特性,可为空冷系统的设计和运行提供理论依据。以典型2×600 MW直接空冷电站为例,通过数值模拟获得了冷却空气流场和温度场,分别计算了空冷岛和各个空冷单元的热风回流率。计算结果表明,随环境风速增加,空冷岛热风回流率升高,并随风向发生显著变化,炉后来风时空冷岛热风回流最为严重。空冷单元热风回流率呈现空间分布特性,风场不同区域空冷单元热风回流存在显著差异,处于风场上游空冷单元通常具有更大的热风回流率。
Ambient winds may lead to the worsened exhaust plume recirculation flows and the deteriorated heat transfer performances of the air-cooled condensers in a power plant.It can be of use for the design and operation of the direct dry cooling system to investigate the space characteristics of the exhaust plume recirculation flow ratios for the air-cooled condensers at ambient winds.On the basis of the representative 2×600 MW direct dry cooling power plant,the flow and temperature fields of the cooling air are presented and the exhaust plume recirculation flow ratios of the air-cooled condensers and condenser cells are calculated by using the numerical simulation.The results show that the exhaust plume recirculation flows are enhanced owing to the increase of the wind speeds and vary widely with the wind directions.The wind blowing from the main buildings is most unfavorable for the exhaust plume recirculation flows.The exhaust plume recirculation flow ratios present space-dependent characteristics and the conspicuous differences are presented among the condenser cells at various locations.The upwind condenser cells generally have more disadvantageous plume recirculation flows.
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