塔式太阳能热发电站设计点DNI优化研究

Optimization of Design Point DNI of Tower CSP Plant

设计点法向直接辐射(direct normal irradiance,DNI)是塔式太阳能热发电站优化设计的重要参数。本研究采用由美国可再生能源实验室开发的数值模拟软件(system advisor model,SAM)对我国哈密地区典型配置的50 MW塔式太阳能热发电站进行数值模拟,考察设计点DNI为700 W/m2~950 W/m2时,各设计点DNI对应的最低成本电价的太阳倍数、镜场规模、储热时长、吸热器功率、发电量和利用小时数等,分析不同设计点DNI对塔式太阳能热发电站设计的影响。结果表明,在塔式太阳能热发电站设计时,开展设计点DNI优化研究工作是十分必要的,在本研究中,最低成本电价区间和最高年发电量的设计点DNI区间为750 W/m2~850 W/m2。

Design point DNI is an important parameter when optimize tower CSP plant.This paper numerically studied 50 MW tower CSP plant with System Advisor Model(SAM)which was developed by National Renewable Energy Laboratory(NREL)of U.S.,we mainly discussed solar multiple,the solar field,thermal storage hour,heat absorber,gross power output and annual utilization hours of design point DNI of 700 W/m2~950 W/m2,so as to analyze the effect of different design point DNI on the design of tower CSP plant.The result shows that,when start the optimization of tower CSP plant,it is necessary to optimize design point DNI first,in the case of this work,when the design point DNI is in range of 750 W/m2~850 W/m2,the gross output and the annual utilization hours are higher than other design point DNI,thus the levelized cost of electricity are lower than other design point DNI.