Research Oin The Optimization Of Solar Tower Receiver Performance

As one of the promising solar thermal power generation technologies,solar tower power generation technology has achieved rapid development in recent years.As a key part of solar power tower system,receiver's performance directly affects the thermal performance of the entire system.In this thesis,taking the solar tower receiver as the research object,and the solar tower receiver's model is established.Based on the second law of thermodynamics and with the goal of obtain the maximum exergy.the two structural parameters:the wall thickness and the inner diameter of the collector tube are optimized.Based on this,the energy transfer characteristics of the solar tower receiver are analyzed.The optimization results are applied to the 50MW tower power station system,and the performance of the solar tower plant system before and after the optimization of the receiver are compared and analyzed.The main contributions can be summarized as follows:(1)Using the molten salt(60%NaNO3 and 40%KNO3)as the heat transfer medium of the receiver,based on the law of conservation of energy and the basic principle of heat transfer,the mathematical model of the receiver is established and build the receiver model on the MATLAB platform.According to the experimental data in the literature,the accuracy of the receiver model in this paper is verified.(2)The relationship between the exergy efficiency of the receiver and the wall thickness and the inner diameter of the collector tube was analyzed.With the maximum exergy obtained by the solar tower receiver as the target,the optimal wall thickness and inner diameter of the tube are obtained.(3)Based on the optimization results above,a series of parameters such as heat loss,exergy loss,thermal efficiency and exergy efficiency along the flow direction of molten salt are analyzed,and the distribution of energy in the heat absorbing tube along the flow direction of the molten salt is revealed.(4)Applying the above optimization results to a 50MW solar tower plant,and the typical daily power generation,annual power generation and annual photoelectric efficiency are used as the evaluation indexes.Compared the evaluation indexes of the 50MW solar tower plant with the optimized receiver and the evaluation indexes of the 50MW solar tower plant with the receiver that the structure is conventional.The results show that the evaluation indexes of the solar power tower system have been improved after optimized.The research in this thesis can provide some theoretical guidance for the design and operation of the solar tower receiver.