Preparation and thermal properties of quaternary mixed nitrate with low melting point
Preparation and thermal properties of quaternary mixed nitrate with low melting point
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DOI：
10.1016/j.solmat.2014.03.056
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发表时间：
2014-08
影响因子：
6.9
通讯作者：
Nan Ren;Yu-ting Wu;Chong-fang Ma;Lixia Sang
中科院分区：
文献类型：
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作者：
Nan Ren;Yu-ting Wu;Chong-fang Ma;Lixia Sang
混合熔盐具有热容量大、蒸气压低、成本低、适用温度范围广等优点，被认为是一种很有前途的太阳能热传导和储能介质。为了获得熔点较低、分解温度较高的熔盐，根据不同的混合比例，制备了一种新型的硝酸盐。实验结果表明，部分熔盐的熔点可降至90℃以下，分解温度在600℃以上，新型混合熔盐具有较低的熔点和较宽的适用温度范围。此外，还对熔融潜热、比热、密度、粘度、导热系数和热稳定性等热物性进行了测试和分析，这些热物性也不比常用的混合熔盐差。因此，它在太阳能热电厂的换热和储能方面是一种很有前途的介质。
Mixed molten salt is considered as a promising medium for both heat transfer and energy storage in solar thermal power because of its many advantages such as large heat capacity, low vapor pressure, low cost, wide range of temperature in application, etc. In order to obtain molten salt with lower melting point and higher decomposition temperature, a new kind of nitrate was prepared based on different mixing ratios of KNO3–NaNO3–LiNO3–Ca(NO3)2·4H2O. Experimental results show that the melting point of some molten salts can be down to below 90 °C with their decomposition temperature above 600 °C. The new kind of mixed molten salts has a lower melting point and wider usable temperature range. In addition, other thermal properties such as latent heat of melting, specific heat, density, viscosity, thermal conductivity and thermal stability are measured and analyzed, which are also not worse than that of commonly used mixed molten salt. Therefore, it is a promising medium for both heat transfer and energy storage in solar thermal power plants.