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熔盐因其具有广泛的使用温度范围,低蒸气压,大热容量,低黏度,良好的稳定性,低成本等诸多特性已成为聚光太阳能热发电中颇有潜力的传热蓄热介质。准确的熔盐热物性对于太阳能发电过程中介质的传热蓄热性能有重要影响。其中熔盐黏度作为重要的热物性之一,对于提高传热效率和降低流动阻力具有决定作用。本文利用研制的高温黏度测量仪对水和HITEC盐的黏度温度特性进行了实验研究,实验结果与文献数据具有较好的一致性,证明了该高温熔盐黏度仪的可靠性。为了降低混合熔盐的熔点,改进其热物性能,本文对Solar Salt进行改性研究,得到两种新型低熔点混合熔盐,并测定得到了黏度温度特性曲线。结果表明,改性后的高温熔融盐黏度有所降低,有利于降低太阳能热发电熔盐传热管路系统的阻力和成本。
Due to its wide range of operating temperature, low vapor pressure, large heat capacity, low viscosity, good stability and low cost, molten salt has become a potential heat-and-heat storage medium for concentrating solar thermal power generation. Accurate molten salt thermophysical properties of solar energy heat transfer medium heat storage performance has an important impact. Among them, the viscosity of molten salt is one of the important thermophysical properties, which plays a decisive role in improving the heat transfer efficiency and reducing the flow resistance. In this paper, the viscosity and temperature characteristics of water and HITEC salt were experimentally studied by the developed high temperature viscosity measuring instrument. The experimental results are in good agreement with the literature data, and the reliability of the high temperature molten salt viscosity meter is proved. In order to reduce the melting point of the mixed molten salt and improve its thermal properties, this paper modified the Solar Salt to obtain two new types of low melting mixed molten salt, and measured the viscosity temperature characteristic curve. The results show that the viscosity of modified high temperature molten salt is reduced, which is helpful to reduce the resistance and cost of molten salt heat transfer pipeline system of solar thermal power generation.