On the basis of the second law of thermodynamics

this paper analyzes and evaluates the system performance of tower photothermal power generation system under the condition of given mirror field layout and solar radiation model

and carries out regular exergy analysis and advanced exergy analysis on each component.It focuses on the heat receiver in the power generation system

explores the influence law of the heat receiver's operation and structural parameters on its performance

and quantitatively analyzes the irreversibility of the heat receiver and coupling effect of the system through advanced exergy analysis.The simulation of a 30 MW tower photothermal power generation system is carried out by Ebsilon software.The simulation results show that

in the tower photothermal power generation system

the internal exergy loss of each component accounts for 60%～95%

which indicates that the performance improvement of each component should be mainly against the component itself.The exergy loss of the heat receiver is much higher than that of other components

indicating that improving the performance of adjacent equipment of the heat receiver has obvious effect on reducing the external exergy loss.The range of exergy efficiency of the heat receiver is 45%～60%.To improve the utilization of available energy of the heat receiver

the heat efficiency of the heat receiver itself should be enhanced

and furthermore

the temperature grade of the working medium of the heat receiver should also be increased.