Low-melting-point mixed fused salt heat storage and heat transfer material and preparation method thereof

Abstract

The invention discloses a low-melting-point mixed fused salt heat storage and heat transfer material and belongs to the technical field of physical heat transfer and energy storage. The components and content of the low-melting-point mixed fused salt heat storage and heat transfer material are as follows: 6-10wt% of NaNO3, 30-47wt% of KNO3, 3-10wt% of NaCl and 37-61wt% of Ca(NO3)2; Ca(NO3)2 can be replaced with LiNo3 or LiNo3 is added at the same time; 5-10wt% of any one of Li2SO4, Na2SO4 and K2SO4 can further be added, so as to obtain the fused salt mixed with a plurality of components. The invention further provides a preparation method of the low-melting-point mixed fused salt heat storage and heat transfer material. The melting point of the mixed fused salt disclosed by the invention is about 80-115 DEG C, the melting point is about 105-140 DEG C lower than that of Solar Salt, and the thermal decomposition temperature reaches 562-595 DEG C. The preparation process of the fused salt is simple, the working temperature range is wide, and the volatilization of components is reduced under long-time operation, so the fused salt is an excellent low-melting-point mixed fused salt heat storage and heat transfer material.

Description

technical field [0001] The invention relates to the technical field of physical heat transfer and energy storage, in particular to a low melting point mixed molten salt heat storage and transfer material and a preparation method thereof. Background technique [0002] At present, countries around the world are in short supply of energy, and the energy issue has become a strategic issue. Solar energy is one of the most economical and environmentally friendly renewable energy sources. Large-scale concentrated use of solar energy is mainly solar power generation technology. [0003] At present, there are two main ways of solar power generation: photovoltaic power generation and photothermal power generation. Photovoltaic power generation uses solar panels to directly convert sunlight into voltage and current, but it is greatly affected by light conditions, especially restricted by cloudy days, nights, and rainy and snowy weather. The photothermal power generation uses huge su...

AI Technical Summary

Problems solved by technology

However, the currently available molten salt formulations still have defects such as high melting point, general thermal stability, and narrow operating temperature range, which cannot meet the high demand for actual production of photothermal power generation technology and other thermal energy projects.

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