Progress of linear Fresnel concentrator heat collection system
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摘要: 相比槽式聚光集热系统,线性菲涅尔式聚光集热系统光学效率较低,但具有成本优势。为了提高其光学性能和热性能,减少热损失,国内外学者进行了广泛研究。在总结线性菲涅尔式聚光集热系统主反射镜、二次反射接收器和镜场的优化设计,以及系统热性能等国内外已有研究成果的基础上,重点阐述了由阴影与遮挡、末端损失、跟踪误差、积尘、主反射镜镜场几何结构引起的光学损失及改进措施最新研究进展,对主流的几种二次反射接收器进行了对比分析,表明复合抛物面二次反射接收器(Composite Parabolic Concentrator, CPC)最实用。同时对吸热管和工作介质之间的强化传热、采用CPC的线性菲涅尔式聚光器热损失进行了归纳总结,分析了存在的问题及解决方法,指出了线性菲涅尔式聚光集热系统的未来发展方向和改进措施。Abstract: Compared with the trough concentrator heat collection system, the linear Fresnel concentrator heat collection system has lower optical efficiency, but it has a cost advantage. In order to improve its optical and thermal properties and reduce heat loss, scholars have conducted numerous research. Based on the summary of the optimization design of the main reflector, the secondary reflector and the mirror field of the linear Fresnel concentrator and heat collection system, as well as the thermal performance of the system and other existing research results at home and abroad, the focus was on the shading and blocking, end loss, tracking error, dust accumulation, optical loss caused by the geometric structure of the main mirror field and improvement measures. A comparative analysis of several mainstream secondary reflection receivers shows that CPC-type secondary reflection receiver is the most practical. At the same time, the enhanced heat transfer between the heat absorption tube and the working medium, and the heat loss of the linear Fresnel condenser using CPC were summarized, the existing problems and solutions were analyzed, the future development direction and improvement measures of LFR system were point out.
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图 7 LFR系统优化的总体方案(1:西端反射镜;2:东端反射镜;3:接收器;λ:主反射镜和接收器的倾角;β:东西方向的旋转角;dz:接收器的取代角)[30]
Figure 7. General scheme of the optimized LFR (1: West reflector surface; 2: East reflector surface; 3: Receiver; λ: Tilt angle of the reflectors and receiver; β: Angle of the east-west rotation; dz: Displacement angle of the receiver)[30]
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