间接空冷塔内外流动和传热性能的数值模拟研究

利用流体计算软件FLUENT，对自然通风状态下，某电厂2×300MW机组两机一塔的间接空冷塔内外空气的流动和传热性能进行了数值模拟研究。将空冷塔划分为W区、T1区、Tr区和L区，在确定的考核工况基准下，模拟了不同环境气温、不同环境风速对空冷塔各区域通风量和间接空冷散热器散热量的影响。模拟结果显示，当风速高于6m／s时，空冷塔通风量和空冷散热器散热量随着气温的升高而增大，此时高温处于有利状况。同一气温下，随着环境风速的增加，空冷塔通风量和间接空冷散热器散热量减小，W区通风量呈线性增加，T1区、Tr区和L区通风量减小。该结论为间接空冷系统空冷散热器的优化设计提供了参考。

Numerical Simulation Research on Flow and Heat Transfer Performance of Indirect Air Cooled Radiator in Air Cooling Tower

By using fluid calculation software FLUENT, a series of numerical simulation research on the flow and heat transfer performance of the air inside and outside the indirect air-cooling tower in some 2 × 300 MW units un- der the natural ventilation circumstance was proceeded. In this paper, air-cooled tower was divided into W, T1, Tr and L area. Under the condition of appraisal benchmark, the impact of different environment temperature and envi- ronment wind speed on the ventilation rate of cooling tower and the heat release of radiators was determined. Simu- lation results show that the ventilation rate of cooling tower and the heat rejection of radiators increases with temper- ature rising when the wind speed reaching up to over 6 m/s, and for this time being the high temperature is good for heat exchanging. Under the same air temperature, the ventilation rate of cooling tower and the heat rejection of ra- diators decreases with the increase of environment wind speed, the supply air rate of W area keeps increasing line- arly, and a decrease in TI area, Tr area and L area. These conclusions are of use in optimal designing for the air- cooled heat exchangers of indirect dry cooling system.