新一代太阳能热发电高温集热场光热力耦合设计方法研究

Heliostat-field thermal mechanics coupling design method of a high-temperature collector field for next-generation solar thermal power

以800℃太阳能吸热器和超临界二氧化碳发电机组为特征的新一代太阳能热发电技术因成本低的优势得到了欧盟、美国、澳大利亚和中国等的立项支持.高温太阳能集热场是太阳能热发电核心技术之一,对高温吸热器的安全性和效率极为重要.本文提出了以安全性和效率为目标,以吸热器许用能流密度为牵引,基于"光学-热学-力学"在电站设计点耦合分析的800℃高温集热场设计方法.

Next-generation solar thermal power technology is characterized by its central receiver with an output temperature of 800℃and using a supercritical carbon dioxide power block.Many countries across the world,such as European Union,America,Australia,and China,support it.A high-temperature solar collector field is a critical component of next-generation solar thermal power technology.In this work,based on the allowable heat flux of the receiver,we developed three design methods,including coupling photon-thermal mechanics,for the collector field.The first method can be used to design a new solar receiver with a given heliostat field.The second method can be used to upgrade the heliostat field with a given solar receiver and power block.The third method can be used to optimize the design of the heliostat field and the solar receiver for a new solar thermal power plant.In comparison with conventional methods,the three proposed methods have higher reliability and better economy.Furthermore,this study proposes a new method to calculate the heat transfer coefficient of the heat transfer fluid inside the receiver tube under nonuniform heat flux conditions.