槽式太阳能热发电系统设计法向直射辐照度优化研究  

RESEARCH ON OPTIMIZATION OF DESIGN DIRECT NORMAL IRRADIANCE FOR TROUGH SOLAR THERMAL POWER SYSTEM

作　　者：李红民[1] 王欢 李乐乐 饶政华[1] Li Hongmin;Wang Huan;Li Lele;Rao Zhenghua(School of Energy Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学能源科学与工程学院,长沙410083

出　　处：《太阳能学报》2021年第10期140-145,共6页Acta Energiae Solaris Sinica

基　　金：湖南省自然科学基金(2016JJ2144)。

摘　　要：以100 MW朗肯循环熔盐储热的槽式太阳能热电厂为对象,建立热经济分析模型,研究不同太阳辐射条件下设计法向直射辐照度(DNI)、太阳倍数与储热时长等设计参数的优化组合,分析这些参数对系统发电量、发电效率和平准化度电成本(LCOE)的影响规律,并提出确定最佳设计DNI的新方法。结果表明,使系统LCOE最小的设计DNI取决于太阳年辐照水平和辐照度的分布,可由高于设计DNI的年辐照量在全年总辐照量中的特定占比来确定。改变主要经济参数进行敏感性分析表明,仅集热镜场成本对最佳设计DNI和相应的辐照量占比略有影响。A thermo-economic model for 100 MW trough solar thermal power plant based on Rankine cycle with molten salt heat storage is established to study the optimal combination of the design parameters such as design direct normal irradiance(DNI),solar multiple and thermal storage hours under different solar radiation conditions.The effects of these parameters on the annual power generation,annual power generation efficiency and average power cost are identified,and then a novel method for determining the design DNI for trough system is proposed.The results show that the optimal design DNI for minimal levelized cost of energy depends on both the annual irradiation level and the distribution of solar irradiance,which can be determined by the specific percentage of the annual radiation above the design DNI in the total annual radiation.Sensitivity analysis by changing the main financial parameters shows that only solar field cost leads to slight change in the optimal design DNI and the corresponding specific percentage.

关 键 词：太阳能热发电 朗肯循环 系统优化 热经济 设计法向直射辐照度 

分 类 号：TK519[动力工程及工程热物理—热能工程]