超临界二氧化碳太阳能热发电系统中集热蓄热颗粒及其性质研究现状  

Research status of properties of particles as thermal energy storage medium in supercritical carbon dioxide cycle for concentrated solar power

作　　者：刘建峰 桑丽霞[1] 王凯音 张冉[1] 吴玉庭[1] LIU Jianfeng;SANG Lixia;WANG Kaiyin;ZHANG Ran;WU Yuting(MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing Key Laboratory of Heat Transfer and Energy Conversion,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学,传热强化与过程节能教育部重点实验室,传热与能源利用北京市重点实验室,北京100124

出　　处：《热力发电》2020年第10期38-47,共10页Thermal Power Generation

基　　金：国家重点研发计划项目(2018YFB1501000)。

摘　　要：超临界二氧化碳(S-CO2)太阳能热发电技术需要集热蓄热介质的工作温度能够达到1000℃以上,以有效提升太阳能热发电效率和降低太阳能热发电成本。固体颗粒可作为集热蓄热工作介质应用于高温环境,其性质和筛选研究对于发展S-CO2太阳能热发电技术至关重要。本文综述了近年来应用于太阳能热发电领域的各种集热蓄热颗粒及其性能研究,包括颗粒的光学性能、热物理性能、热稳定性和抗磨损性,进而总结和展望了集热蓄热颗粒的研究重点,指出目前缺乏对固体颗粒性能的全面分析研究,对颗粒表面改性以及通过添加颜料来制备高吸收率的粒子是新的研究热点,国内对于颗粒比热容的研究温度较低(800℃以下),需进一步加强颗粒比热容和导热系数的热循环稳定性研究,以及考虑颗粒磨损和失效导致的寿命缩短及颗粒不同性质导致的综合成本研究。The operating temperature of thermal energy storage medium is required to reach over 1000℃in supercritical carbon dioxide(S-CO2)cycle for concentrated solar power.This can effectively improve the efficiency of solar thermal power generation and reduce the cost of solar thermal power generation.Solid particles can be used as working medium for heat collection and storage at high temperature,and investigations on their properties and selection are very important for the development of S-CO2 solar thermal power generation technology.This paper summarizes the studies on various thermal energy storage particles and their properties applied in the field of solar thermal power generation in recent years,including optical properties,thermophysical properties,thermal stability and abrasion resistance.Furthermore,key issues on studies on solid particles in S-CO2 solar thermal power generation system are discussed.It points out that,the future study should be strengthened in comprehensive analysis of the properties of solid particles,and the preparation of particles with high absorptance via surface modification or adding pigments becomes the new hot subject.Moreover,it is necessary to carry out further research on thermal cycling stability of specific heat capacity and thermal conductivity of the particles,as well as the cost taking into account the particles properties and the shortening of service life due to abrasion and invalidation.

关 键 词：超临界二氧化碳 太阳能热发电 固体颗粒 光学性质 热物理性能 

分 类 号：TK512.4[动力工程及工程热物理—热能工程]