我国火力发电厂的冷却塔大多数采用逆流式自然通风冷却塔。由于单台机组容量的增大以及普遍采用单元制供水系统,因此单座冷却塔的容量也趋于大型化。以往中小型逆流式自然风冷却塔均采用槽式自流配水系统,在实践中我们发现其缺点是对流量适应变化的程度较差,当超过额定流量时,水 Most of the cooling towers in China’s thermal power plants employ counter-flow natural draft cooling towers. As the capacity of a single unit increases and the unit-based water supply system is commonly used, the capacity of a single-seat cooling tower also tends to increase. In the past, small and medium-sized counter-flow natural wind cooling towers all used trough-type self-distribution water distribution systems. In practice, we found that their disadvantages are poor adaptability to changes in flow rates. When the rated flow rate is exceeded, water is used.