抛物槽式太阳能蒸汽发生系统研究

Study on Parabolic Trough Solar Collector Steam Generation System

针对600m^2抛物槽式太阳能试验台,建立了太阳能蒸汽发生系统的数学模型,开展了模拟研究,并验证了集热场模型的正确性。研究了太阳直射辐射、入射角等因素对系统性能的影响,分析了系统动态特性,利用图像分析(EUD)方法分析了系统的能量转化过程。结果表明,系统集热效率在高温段下降程度加剧;集热效率随太阳入射角的增大而越小,入射角由0°变化到40°时,集热效率下降约30%,系统性能提升空间主要在降低光学损失和改善光热转化过程。研究结果将为抛物槽式太阳能集热技术和蒸汽发生系统的设计提供依据。

Based on the experimental devices of the 600 m^2 parabolic trough solar collector （PTSC） steam generation system,a comprehensive model was developed to predict overall system performance.This model was verified by the experimental data from literature.The effects of direct normal irradiation（DNI）,incident angle and operational temperature were analyzed.Energy conversion process was evaluated with the aid of Energy Utilization Diagram（EUD） methodology. The results showed that,the energy efficiency decreased intensely in the high-temperature segment with the increase of the operation temperature;the energy efficiency of the collector dropped about 30%,when the incident angle increased from 0°to 40°.The study also pointed out that the exergy destruction mainly took place in the process of optical loss and optic-thermal conversion.The results will provide a reference for the design of parabolic trough solar collectors and steam generation system.