空冷机组设计中典型气象年的选取

Selection of Typical Meteorological Year in Air Cooling Unit Design

以府谷清水川电厂为例,对空冷机组典型气象年(typical meteorological year,TMY)的选取进行探讨,根据影响空冷机组设计及运行的气象因素,确定平均温度、最高温度、最低温度、平均风速和最大风速等5个气象参数作为因子,利用Finkelstein-Schafer(FS)统计方法选取TMY,并与传统的典型代表年(typical reference year,TRY)进行设计气温、满发气温等几方面的对比分析。结果表明,TMY较TRY更能反映建设项目所在地气温变化的长期规律,适应机组夏季满发的"多发电量"性质要求,且TMY所选设计气温更有利于机组经济运行,因此可以得出FS方法选择TMY是切实可行的,且明显优于TRY,对空冷系统的设计更具应用价值,同时总结典型年选取的步骤,首先确定资料统计时段,然后选取典型月(typical meteorological month,TMM)组成一个"虚拟"气象年。

Selection of typical meteorological year （TMY） for the design of air cooling unit was discussed, taking Fugu Qingshuichuan power plant in Shaanxi as an example. According to the meteorological factors affecting the design and functioning of the air cooling unit, average temperature, the maximum temperature, the minimum temperature, average wind speed and the maximum wind speed were chosen as main parameters. The statistical method of Finkelstein-Schafer （FS） was used to make a comparison with the results from the traditionally typical representative year （TRY） method on the designed temperature and full-generated temperature. The results show that TMY reflects the long-term law for the temperature change of the construction site much better than the TRY and suits the requirements of the units for ＂more generation＂ in summer. In addition, the chosen temperature of the TMY is more propitious to the economical function for the units. The conclusion can be drawn that the method of FS to choose TMY is feasible and of more using value for the design of air-cooling system. The steps selecting TMY was summarized in the end, which is the determination of the statistical period for the first and then the typical meteorological month （TMM） picked out as a virtual meteorological year.