塔式太阳能热发电吸热器热效率影响因素分析  

Analysis on Factors Influencing the Receiver Thermal Efficiency in a Tower-type Solar Thermal Power System

作　　者：孙成金 葛婷婷[2] 潜钧 范玲萍[2] 许利华[2] Sun Chengjin;Ge Tingting;Qian Jun;Fan Lingping;Xu Lihua(Boiler Inspection Institute of Nanjing Military Region, Hangzhou 310002, China;Hangzhou Boiler Group Co., Ltd., Hangzhou 310022, China)

机构地区：[1]南京军区锅炉检验所,杭州310002 [2]杭州锅炉集团股份有限公司,杭州310022

出　　处：《发电设备》2020年第3期161-165,共5页Power Equipment

摘　　要：对塔式太阳能热发电吸热器表面的热流特性进行分析,并通过热流平衡关系式得出吸热器热效率的公式,研究了吸热器的发射率、吸收率、风速、环境温度等因素对吸热器热效率的影响;同时对不同聚光比、不同吸热器温度条件下系统的热电综合效率进行了研究分析。结果表明:环境温度对吸热器热效率的影响很小,而风速对吸热器热效率的影响不容忽略,当风速高于12 m/s时,对流散热损失超过了辐射散热损失;选择性涂层可以提高吸热器的热效率,对于高聚光比的塔式太阳能热发电技术,可提高吸热器热效率约5.0百分点;系统的热电综合效率在给定聚光比条件下存在最大值。研究结果可为吸热器的设计及整体系统的优化提供参考。The heat flux distribution on the surface of a receiver in the tower-type solar thermal power system was analyzed,while a formula to calculate the thermal efficiency of the receiver was obtained based on the heat balance equation,so as to study the effects of following factors on the receiver thermal efficiency,such as the emissivity,absorption rate,wind speed and ambient temperature,etc.In addition,the comprehensive thermoelectric efficiency was evaluated for the system at different concentrating ratios and receiver temperatures.Results show that the ambient temperature has slight influence on the thermal efficiency of the receiver,but the influence of wind speed could not be neglected.When the wind speed is more than 12 m/s,the convective heat loss would be larger than the radiative heat loss.A layer of appropriate coating may help to improve the thermal efficiency of the receiver;for the tower-type solar thermal power system with a high concentrating ratio,the thermal efficiency could be increased by about 5.0 percentage points.The comprehensive thermoelectric efficiency has a peak point for a given concentrating ratio.The research results may serve as a reference for the design of the receiver and the optimization of relevan tower-type solar thermal power systems.

关 键 词：塔式太阳能热发电 吸热器 聚光比 热效率 

分 类 号：TM615.1[电气工程—电力系统及自动化]