一种新型全玻璃真空管太阳能高压蒸汽发生器设计与性能实验

DESIGN AND PERFORMANCE STUDY OF ALL-GLASS EVACUATED TUBULAR SOLAR STEAM GENERATOR

将普通全玻璃真空管太阳集热器和简化结构的CPC(compound parabolic concentrator)相结合,并在玻璃真空管内管中安装套管结构换热器,设计出一种新型廉价的高温太阳能水蒸气集热系统。研究系统由60个单元串联而成,每个单元主要由简化式CPC、双层玻璃真空集热管、换热套管3部分组成。实验以高压水作为传热工质,研究天气条件、设计条件和蒸汽压力等对系统性能的影响。实验结果表明:该系统能够获得压力超过0.40 MPa、温度接近200℃的饱和水蒸气和过热水蒸气,系统最大功率达到9 k W,最大集热温度下的集热效率超过30%。

A new-type all-glass evacuated tubular solar steam generator is designed and tested to provide high temperature/high pressure steam. The experimental apparatus consists of 60 linked collecting units, each mainly includes a simplified CPC, an all-glass evacuated tubular collector and an annular tube heat exchanger amounted in the glass evacuated tube. The high pressure water is used as the working fluid. A special solid-liquid mixed medium with high thermal conduction is filled between all-glass evacuated tube and annular tube. The collecting performance of the apparatus is investigated for understanding the effect of weather conditions, collecting unit design and the operating pressure at the steam temperature, collecting power and system efficiency. Experimental results show that the steam temperature in the outlet of the collector can be up to about 200 ℃, while the power and efficiency of the system can exceed 9 kW and 30%, respectively, which manifests excellent solar collecting performance.