不同装机容量下S-CO_(2)塔式太阳能热发电系统的热力及经济性能分析  

THERMODYNAMIC AND ECONOMIC ANALYSIS OF SOLAR POWER TOWER SYSTEM BASED ON S-CO_(2) CYCLE WITH DIFFERENT INSTALLED CAPACITY

作　　者：杨竞择 杨震[1] 段远源[1] Yang Jingze;Yang Zhen;Duan Yuanyuan(Key Laboratory for Thermal Science and Power Engineering of MOE,Beijing Key Laboratory for CO2 Utilization and Reduction Technology,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学热科学与动力工程教育部重点实验室,二氧化碳资源化利用与减排技术北京市重点实验室,北京100084

出　　处：《太阳能学报》2022年第9期125-130,共6页Acta Energiae Solaris Sinica

基　　金：北京市自然科学基金(3202014)。

摘　　要：建立超临界CO_(2)布雷顿循环塔式太阳能热发电系统的热力性能和经济性能模型,比较不同装机容量下系统的年均效率,分析系统中各项成本占比及其随容量增长的变化规律,提出进一步降低发电成本的方法。结果表明,主要受镜场效率的影响,系统年均效率随装机容量增加先升后降,峰值为20 MW时的17.4%。发电成本随装机容量的增加而减小,由1 MW时的0.477美元/kWh降至100 MW时的0.125美元/kWh。减小镜场和储热的投资成本是降低大规模电站发电成本的关键。The thermodynamic and economic performance models of solar power tower system based on supercritical CO_(2) Brayton cycle are established. The average annual efficiencies of the systems under different installed capacity are compared. The cost proportion of each item and its variation with the increase of installed capacity are analyzed. The methods to further reduce the cost of power generation are proposed. The results show that the average annual efficiency of the system first increases and then decreases with the increase of installed capacity, and its peak value is 17.4% at 20 MW, which is mainly affected by the solar field efficiency. The levelized cost of energy decreases with the increase of installed capacity, from 0.477 $/kWh at 1 MW to 0.125 $/kWh at 100 MW.Reducing the investment costs of solar field and thermal energy storage are the keys to reduce the power generation cost of large-scale power plant.

关 键 词：太阳能热发电 布雷顿循环 热力学 超临界CO_(2) 装机容量 

分 类 号：TK514[动力工程及工程热物理—热能工程]