【摘要】 新一代二氧化碳超临界太阳能热发电系统中提出采用固体颗粒作为蓄热介质，陶粒砂因良好的抗磨损性、耐高温、化学稳定性及低成本等优点而有望成为固体颗粒蓄热介质的候选材料。本文基于三种陶粒砂的储热性能和光吸收性的测试分析，对其进行表面改性以进一步提高光吸收性能。结果表明，三种陶粒砂具有良好热稳定性，且蓄热密度较大，通过表面改性可明显提高三种陶粒砂吸光性质，太阳光加权吸收比均可达到0.9。更多还原

【Abstract】 The new generation of concentrated solar thermal power with supercritical CO2Brayton cycle is based on the solid particles as heat storage medium. Ceramsite sand is expected to be a candidate material for heat storage medium due to its good wear resistance, high temperature resistance, chemical stability and cheap. In this paper, based on the measurement and analysis of the thermal performance and optical properties of three kinds of ceramsite sands, the surface modification was carried out to further improve the solar absorptance. The results show that the three kinds of ceramsite sands have good thermal stability and high heat storage density. The solar absorptance of the three kinds of ceramsite sands can be significantly improved by surface modification, and the solar weighted absorptance can reach 0.9.更多还原