660 MW机组间接空冷主辅共塔方案影响分析

Analysis on Design Scheme of Main-Auxiliary Combined Indirect Dry Air Cooling Tower for 660 MW Power Plant Units

针对660 MW机组冷却塔的主辅共塔设计方案,建立了主辅共塔间接空冷塔的三维数值模型,研究了环境风对冷却塔内外流场的影响,分析了环境风向、辅机散热器类型和冷却三角增加方式对主机、辅机水温降幅的变化规律。研究结果表明,环境风方向对主机循环水温降影响较小(约为1.0℃),对辅机循环水温降影响较大(约为5.8℃);当辅机采用4排管散热器时,辅机循环水温降增大2.5%(约为0.2℃),主机循环水温降减小0.5%(约为0.06℃)。研究结果可为主辅共塔设计方案的具体工程实施提供依据。

In this paper,regarding the design scheme of the main-auxiliary combined cooling tower for 660 MW power plant units,a3-D simulation model is built to study the impacts of ambient wind on the flow fields both inside and outside of the cooling tower.Also this paper explores how the variations of main and auxiliary circulating water temperature drop are affected by the ambient wind direction,the type of the heat exchanger of the auxiliary cooling unit and the method of increasing the number of cooling triangles.The results show that the ambient wind direction has very limited effects on the main circulating water temperature drop(about 1℃)but significant impacts on the auxiliary circulating water temperature drop(about 5.8℃).If the four-row-tube arrangement is adopted in the heat exchanger,the drop of the auxiliary circulating water temperature increases by about 0.2℃,and the drop of the main circulating water temperature decreases by about 0.06℃.The research results can provide reference for the engineering implementation of the design scheme of the main-auxiliary combined tower.