槽式太阳能腔体式吸热器热力性能分析  

Analysis of Thermodynamic Performance of Cavity Absorber in the Parabolic Trough Solar Concentrator

作　　者：刘庆君[1] 刘德有[1] 朱天宇[2] 毛宇飞[1] 王磊[1] 

机构地区：[1]河海大学,江苏省南京市210098 [2]南通河海大学海洋与近海工程研究院,江苏省南通市226300

出　　处：《中国电机工程学报》2015年第1期126-132,共7页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973计划)(2010CB 227102);江苏省科技支撑计划项目(BE2013070);河海大学中央高校基本科研业务费项目(2013B19014)~~

摘　　要：详述了适用于槽式太阳能中低温有机朗肯循环热发电系统的腔体式吸热器的结构形式和聚光原理;并应用TRACEPRO软件对该吸热器的光学特性进行了分析,证实了该吸热器能够可靠地接收太阳辐射;建立了该吸热器的二维稳态传热计算模型;选用R123作为工质,系统地分析了其在超临界工况下的辐照强度、工作压力、工质流量、环境风速以及保温层厚度等参数对热吸热器热力性能的影响规律。结果表明:吸热器在超临界工况下工作时,适当增加工质流量可以增大其吸热量并保证其安全稳定运行;增加入口压力会增加设备成本,并且不能提高吸热器的性能;合理的保温层厚度可以有效减少热损,使吸热器性能得到改善。研究结果可为设计和搭建腔体式吸热器实验台提供理论参考。The paper presented the structure and focusing principle of cavity absorber in the parabolic trough solar concentrator that was suitable for low and medium temperature solar thermal electric generation with organic Rankine cycle（ORC）. The optical characteristics were studied by TRACEPRO software,and it was approved that the absorber reliably accepted solar radiation. This paper first established a two-dimensional steady-state heat transfer model, and selected R123 as working fluid, then systematically analyzed the major influence factors, including the solar irradiation, working pressure, flow rate, wind speed, and thickness of insulating layer, on the supercritical heat transfer processes. The results show that increasing mass flow rate should be carried out to enhance the heat absorption and keep the absorber tube in the safe state under supercritical condition. Equipment cost rises with increasing the inlet pressure, and can＇t improve the performance. The suitable insulation thickness can effectively reduce heat loss and improve performance of the absorber. The research results offer a reference for designing and building cavity absorber experimental system.

关 键 词：槽式太阳能热发电 腔体式吸热器 二维稳态传热模型 超临界流体 R123 集热效率 

分 类 号：TK514[动力工程及工程热物理—热能工程]