直接式S-CO_2塔式太阳能热发电系统光-热-功一体化热力学分析  

Thermodynamic Analysis of Solar Thermal Power Tower Systems Integrated With the Direct-heated Supercritical CO_2 Brayton Cycles

作　　者：朱含慧 王坤[1] 何雅玲[1] ZHU Han-Hui WANG Kun HE Ya-Ling(Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education, School of Energy and Power Engineering Xi＇an Jiaotong University, Xi＇an 710049, China)

机构地区：[1]西安交通大学热流科学与工程教育部重点实验室,西安710049

出　　处：《工程热物理学报》2017年第10期2045-2053,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金重点项目(No.51436007)

摘　　要：本文将简单回热,预压缩,再压缩,部分冷却和中间冷却超临界二氧化碳(S-CO_2)布雷顿循环分别与塔式太阳能热发电(SPT)系统结合,建立了直接式S-CO_2塔式太阳能热发电系统的光-热-功一体化模型,对5种S-CO_2循环下整个SPT系统在不同透平入口温度下的热力学性能进行了对比分析。结果表明:随着透平入口温度的增大,整个SPT系统的效率在650℃附近具有最大值,表明直接式S-CO_2塔式太阳能热发电系统的运行温度并非越高越好;在本文研究的透平入口温度范围内(500~800℃),中间冷却和部分冷却S-CO_2循环下的SPT系统具有最高的效率,但系统也最为复杂;再压缩S-CO_2循环下的SPT系统在高温范围(650~800℃)具有较高的效率,且系统比较简单,具有巨大的应用潜力。In this paper, a complete mathematical model is developed for the solar power tower（SPT） system integrated with five different direct-heated supercritical CO2（S-CO2） Brayton cycles（simple, pre-compression, recompression, partial-cooling, and intercooling） respectively, and the effect of turbine inlet temperature（TIT） on the thermodynamic performances of the integrated SPT systems is investigated and compared among these cycles. The results reveal that the overall efficiencies do not increase with TIT monotonically but show a parabolic tendency with maximum values around the TIT of 650℃, which shows that it is not necessary to pursue excessively high TIT for the direct-heated integrated SPT systems. Furthermore, the intercooling and the partial-cooling S-CO2 cycles achieve the highest overall efficiencies at the TIT of 500~800℃, whereas the corresponding cycle configurations are more complicated. The recompression S-CO2 cycle with relatively simple cycle configuration has higher overall efficiencies when the TIT is at 650~800℃, making it become an attractive candidate for SPT system applications.

关 键 词：直接式系统 S-CO2循环 塔式太阳能热发电 一体化建模 热力学性能 

分 类 号：TK124[动力工程及工程热物理—工程热物理]