为降低多孔介质吸热器中心表面温度、提高热效率和并保障安全运行,设计一种内插石英玻璃管的吸热芯结构。该吸热器通过在单层多孔介质吸热器中心区域开设圆柱孔,并插入石英玻璃管,实现工质流体速度与高斯型聚集太阳光热流密度的匹配。在此基础上,采用数值模拟与实验验证相结合的方法,对单层、中孔和内插石英玻璃管3种多孔介质吸热器的高温吸热特性进行对比研究。结果表明,与单层吸热芯相比,中孔、内插玻璃管吸热器中心区域流速由0.75 m/s分别提升至1.6 m/s和1.8 m/s,聚集太阳光热流密度峰值由1.5 MW/m2分别降至0.92 MW/m2和1.2 MW/m2,固体峰值温度由1740 K分别降至1444 K和1436 K。在3~10 g/s流速范围内,热效率由单层吸热芯的58%~70%提升至中孔吸热芯的66%~78%和内插石英玻璃管吸热芯的71%~82%。
Abstract
A modified porous solar receiver with a hollow glass tube at the center was developed to decrease the surface temperature of the receiver and improve thermal efficiency and security.The hollow glass tube matches the heat transfer fluid （HTF） and the concentrated solar flux （CSF）,which can increase the velocity of the HTF by suction effect and reduce the CSF by increasing the absorption area. Then, the high-temperature heat transfer characteristics of the single porous receiver （SPR）,modified porous receiver with a center hole （MPR-CH）,and modified porous receiver with a hollow glass tube （MPR-HGT） were investigated and compared.Results show that the maximal velocity of the HTF at the center zone of the SPR,MPR-CH,and MPR-HGT increases from 0.75 m/s to 1.6 m/s and 1.8 m/s, respectively. The peak CSF of the SPR, MPR-CH, and MPR-HGT increases from 0.75 m/s to 1.6m/s and 1.8 m/s,respectively.Accordingly,the peak solid temperature of the SPR,MPR-CH,and MPR-HGT decreases from 1740 K to 1444 K and 1436 K, respectively.The thermal efficiency of the three receivers increases from 59.3%~71.9% to 65.7%~79.9% and 70.4%~81.6% during the mass flow rate of the HTF from 3.0 g/s to 10.0 g/s. This modified porous solar receiver design can be implemented into advanced, high-temperature power cycles.
关键词
太阳能 /
吸热器 /
热流密度 /
传热性能 /
热效率
Key words
solar energy /
solar absorber /
heat flux /
heat transfer performance /
thermal efficiency
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基金
国家自然科学基金（52176181）; 福建省科技计划项目（2022N0016）; 市科技计划项目（N2023Y006）
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