Thermal and structural evaluation of composite solar receiver tubes for Gen3 concentrated solar power systems
Thermal and structural evaluation of composite solar receiver tubes for Gen3 concentrated solar power systems
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DOI：
10.1016/j.renene.2022.02.118
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发表时间：
2022-03
期刊：
影响因子：
8.7
通讯作者：
Shen Du;Zexiao Wang;Shengqi Shen
中科院分区：
文献类型：
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作者：
Shen Du;Zexiao Wang;Shengqi Shen
提出了一种含有导热层和高温保护层的复合太阳能接收管，以改善其热性能和结构性能。根据材料热膨胀系数的相似性，选择了两种材料组合，即Inconel 718/镍和316不锈钢/GRCop-84。利用计算流体力学方法分析了太阳能-热能转换过程中超临界二氧化碳在太阳能管内的流动和传热。基于导出的温度场和压力分布，通过有限元分析解决了由于不同的太阳能管设计引起的热应力。结果表明，复合材料设计可以降低太阳能管的最大热应力和最高温度。Inconel 718/镍和316不锈钢/GRCop-84复合太阳管的最大热应力分别降低了4.1MPa和24.0MPa。随着管壁厚度的增加和太阳辐射强度的增加，性能的改善更加显著。由于表面温度降低，太阳能管的整体热效率可提高1.3%，高温保护材料的蠕变问题也得到缓解。
A composite solar receiver tube containing thermally conductive and high-temperature protective layers is proposed to improve its thermal and structural performances. Two combinations of materials, which are Inconel 718/nickel and 316 stainless steel/GRCop-84, are selected based on the similarity in their coefficients of thermal expansion. The solar-to-thermal energy conversion in conjunction with the fluid flow and heat transfer of supercritical carbon dioxide inside the solar tubes is analyzed by computational fluid dynamics. The thermal stress due to different solar tube designs is solved by finite element analysis based on the derived temperature field and pressure distribution. The results show that both maximum thermal stress and maximum temperature in solar tubes could be reduced by the composite design. The maximum thermal stress decreases by 4.1 MPa and 24.0 MPa respectively in Inconel 718/nickel and 316 stainless steel/GRCop-84 composite solar tubes. The performance improvement becomes more significant as the thickness of tube wall and intensity of solar radiation increase. Due to the surface temperature reduction, the entire thermal efficiency of solar tubes could increase by up to 1.3% and the creep issue of high-temperature protective materials can be alleviated.