Measurement of spectral radiative characteristics of molten salt at high temperature using emission method
Measurement of spectral radiative characteristics of molten salt at high temperature using emission method
复制标题
发射法测量高温熔盐光谱辐射特性
DOI：
10.1016/j.applthermaleng.2018.12.046
复制
发表时间：
2019
影响因子：
6.4
通讯作者：
Tan Heping
中科院分区：
文献类型：
--
作者：
Xie Ming;Zhu Yanlong;Liu Yi;Yuan Yuan;Tan Heping
随着新能源使用量的增加，熔盐作为一种重要的高温工质被广泛应用于许多领域。除了对熔盐的热学性质的研究外，对熔盐的辐射性质的研究主要集中在0.32.5 μm的波长范围内，但在600 μ°C时，大部分发射能量落在2.5-25 m的范围内。在5-25 μm的波长范围内测量了HITEC和太阳盐的光谱发射率，并消除了大锅内壁辐射和小锅底上表面发射和反射的影响。结果表明，熔盐的光谱发射率随温度的升高而增大。在6-8.5 μm波长范围内，HITEC发射率连续下降两次，而太阳盐发射率在6.5-7.5 μm范围内只有一次下降，在实验温度和波长范围内不确定度小于5.9%。研究结果对聚光太阳能(CSP)装置的设计和运行条件的优化以及熔盐热物性的精确测量具有一定的指导意义。
Molten salt is widely used in many fields as an important working fluid at high temperature as the increase in the use of new energy sources. In addition to studies on the thermal properties, research on the radiative properties of molten salts is mainly in the wavelength range of 0.3–2.5 μm, but most of emission energy falls in range of 2.5–25 μm at 600 °C. In this study, an emissivity measurement system for a liquid molten salt was developed on the basis of the black body emission method. The spectral emissivities of Hitec and Solar Salts were measured in the wavelength range of 5–25 μm. Moreover, the effects of the radiation of the inner wall of the large crucible and the emission and reflection at the upper surface of the bottom of the small crucible were eliminated. The results showed that the spectral emissivity of a molten salt increases with the temperature. In the wavelength range of 6–8.5 μm, two continuous depressions were observed in the emissivity of the Hitec, whereas there was only one depression in the emissivity of the Solar Salt in the range of 6.5–7.5 μm. The uncertainty of the experiment is less than 5.9% in experimental temperature and wavelength range. The results are supposed to be useful in designing and optimizing the equipment and operating conditions in the concentration solar power (CSP), as well to be helpful in accurately measuring the thermal properties of the molten salt.