提出一种基于两级蓄热罐和复叠有机朗肯循环的太阳能热发电系统。该系统根据太阳辐照度的变化可在额定模式和放热模式间切换,以保证发电的稳定性和持续性。采用联苯-联苯醚同时作为集热、蓄热及顶部有机朗肯循环（ORC）的工质,苯作为底部ORC工质。对系统进行热力学优化,结果表明最大热功转化效率为38.54%,甚至比采用合成油集热、双罐熔融盐蓄热的常规热发电系统效率还高,表明所提出系统具有较好的应用前景。
Abstract
This paper presents a solar thermal power generation system based on two-stage heat storage tank and cascade organic Rankine cycle. The system can switch between rated and discharge modes according to the variation of solar radiation intensity, which ensures the stability and continuity of power generation. Biphenyl-diphenyl oxide mixture is adopted as the heat collection, thermal storage and power cycle fluid of the top organic Rankine cycle （ORC）, while benzene is used as the working fluid of the bottom ORC. Thermodynamic optimization of the system is carried out. The results indicate that the maximum thermal power conversion efficiency of 38.54% is achieved. The efficiency is even higher than those of the conventional solar power plants using synthetic oil as the heat carrier and dual-tank molten salts as the storage fluid. It manifests that the proposed system has a good application prospect.
关键词
太阳能热发电 /
朗肯循环 /
热效率 /
?损失 /
联苯-联苯醚
Key words
solar thermal power generation /
Rankine cycle /
thermal efficiency /
exergy loss /
biphenyl-diphenyl oxide
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基金
压缩机技术国家重点实验室（压缩机技术安徽省实验室）开放基金（SKL-YSJ201914）; 安徽省自然科学基金青年基金 （2008085QE235; 2008085QE224）
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