聚光太阳能SCO_(2)热发电系统性能分析与优化设计  

PERFORMANCE ANALYSIS AND OPTIMIZATION DESIGN OF SUPERCRITICAL CO_(2)POWER CYCLES FOR CONCENTRATING SOLAR THERMAL POWER

作　　者：范刚 宋健 宫啸宇 傅子隽 张嘉耕 戴义平[1] Fan Gang;Song Jian;Gong Xiaoyu;Fu Zijun;Zhang Jiageng;Dai Yiping(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710048,China;Clean Energy Processes(CEP)Laboratory,Imperial College London,London SW72AZ,UK)

机构地区：[1]西安交通大学能源与动力工程学院,西安710048 [2]帝国理工学院清洁能源过程实验室,伦敦SW72AZ

出　　处：《太阳能学报》2024年第7期590-598,共9页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51976145)。

摘　　要：针对聚光太阳能超临界二氧化碳(SCO_(2))热发电系统展开研究,构建系统热力学性能分析模型,分析集热侧、动力循环侧的性能,揭示系统集热-蓄热-热功转化之间的相互匹配特性规律,综合分析比较不同集热器、储热工质、动力循环组成的聚光太阳能SCO_(2)热发电系统的全年发电量和年均光-电转化效率,并对系统参数进行优化设计。结果表明:与线性菲涅尔式、槽形抛物面式聚光方式相比,塔式聚光方式的集热量受季节影响小,单位面积上全年集热量最高,全年集热效率约43%;增大高温储罐工质温度或降低低温储热罐工质温度能增大系统年发电量与年均光-电转化效率;采用塔式集热、NaCl-KCl-MgCl_(2)高温熔融盐、再压缩式超临界CO_(2)循环的聚光太阳能热发电系统具有最佳热力学性能。This research focuses on performance analysis and design optimization of CSP plants integrated with SCO_(2)systems.The ther-modynamic models are established to analyze the performance of the collector subsystem and power cycle subsystem.The interaction characteristics among the heat collection,thermal energy storage,and energy conversion process are demonstrated.The performance comparison of different CSP systems are conducted in this study,of which three collectors,two heat storage mediums,and two SCO_(2)cycles are considered.Finally,the optimization are conducted for the proposed systems.The results show that compared with linear Fres-nel and parabolic trough collectors,solar power towers(SPTs)generally exhibit a more consistent optical performance in summer and winter and the annual heat-collecting efficiency reaches 43%by SPTs.Increasing the hot tank temperature or decreasing the cold tank temperature contribute to higher annual power generation.The optimization result indicates that the SPT plant integrated with recompres-sion SCO_(2)cycle and NaCl-KCl-MgCl_(2) molten salt provides the best thermodynamic performance.

关 键 词：太阳能热发电 超临界CO_(2)循环 热力学性能 优化设计 

分 类 号：TK513.5[动力工程及工程热物理—热能工程]