基于太阳能热发电系统效率的最佳运行温度

The optimum operating temperature for system efficiency of solar thermal power system

分别对汽轮机组热机效率和太阳能集热器效率进行了分析,并对热机效率进行了修正,得到了不同状况下的太阳能热发电系统效率和最优运行温度。研究表明:随着太阳辐照度、太阳能热发电系统聚光比的增加,系统效率提高,最佳集热温度升高;然而,当综合传热系数增大时,系统效率下降,最佳集热温度降低;太阳能集热器光学效率的变化,只影响系统效率,对系统的最佳集热温度影响不大。

In order to study optimal operating temperature of solar thermal power generation system,heat engine efficiency of steam turbine and solar collector efficiency are analyzed respectively and the efficiency of heat engine are revised. Then system efficiency of the solar thermal power system and optimum operating temperature are obtained under different conditions. The results showed that efficiency of the system increases and optimum collector temperature rises with increase of direct normal irradiance and optical concentration ratio;However,when overall heat transfer coefficient increases,efficiency of the system drops and optimum collector temperature decreases;The change of solar collector optical efficiency only has an impact on system efficiency,but it has little effect on the optimal collector temperature.