针对高温真空集热管真空老化性能展开真空度预测和寿命评价研究。模拟电站高温集热管运行环境,在400 ℃进行热循环模拟和热损测试,在450 ℃进行过热加速循环试验。结果表明：集热管封离后,室温条件下其内初始真空度达4.7×10-4 Pa,在400和450 ℃经过400次循环后,管内真空度分别为5×10-3 Pa和6×10-2 Pa。室温状态下集热管在吸收涂层法向发射比为0.08,真空度为10-3 Pa时,400 ℃下热损为216 W/m,显示出良好的热性能。拟合结果表明在400 ℃条件下集热管使用寿命满足25年要求。
Abstract
This study aims at obtaining vacuum aging mechanism in the annulus of the receiver. Simulating the parabolic trough receiver operation environment, the receivers are heat-treated at 400 ℃ and 450 ℃ to get the variative regulation of the vacuum. The initial vacuum level of the receiver after the degassing process is 4.7×10-4 Pa at room temperature. After 400 cycles at 400 ℃ and 450 ℃, the pressure of the receiver is 5×10-3 Pa and 6×10-2 Pa, respectively. At room temperature, when the normal emission ratio of the absorption coating is 0.08 and the vacuum degree is 10-3 Pa, the heat loss of the receiver tube is 216 W/m at 400 ℃, showing good thermal performance. The life time of the receiver is about 25 years according to the accelerated aging experiment.
关键词
太阳能 /
高温真空集热管 /
真空性能 /
老化 /
热损
Key words
solar energy /
parabolic trough receiver /
vacuum property /
aging /
heat loss
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参考文献
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基金
政府间国际科技创新合作重点专项（2019YFE0102000）; 国家新材料测试评价平台-主中心建设项目（招标编号：TC170A5SU-1）
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