Mixed molten salt heat storage and heat transfer material and preparation method thereof

Abstract

The invention discloses a mixed molten salt heat storage and heat transfer material, and belongs to the technical field of physical heat transfer and energy storage. The mixed molten salt is prepared from the following components: 28-35wt% of LiNO3, 1.5-4wt% of NaNO3, 2.5-8wt% of KNO3, 5-16wt% of NaNO2 and 48-55wt% of KNO2, any of 3-8wt% of Ca(NO3)2, Ba(NO3)2 or Sr(NO3)2, any of 3-10wt% of LiCl, NaCl or KCl, and any of 4-10wt% of Li2SO4, Na2SO4 or K2SO4, thus obtaining multiple mixed molten salt heat storage and heat transfer materials. The invention also provides a preparation method of the mixed molten salt heat storage and heat transfer material. The melting point of the obtained mixed molten salt is 65-70 DEG C and is reduced by nearly 150 DEG C relative to that of Solar Salt, the thermal decomposition temperature of the mixed molten salt reaches 552-600 DEG C, and the molten salt is simple in preparation and wide in working temperature range, can reduce the volatilization of components under long-time operation and is an excellent 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 mixed molten salt heat storage and heat transfer material and a preparation method thereof. Background technique [0002] The current energy shortage in all countries in the world, the energy problem has become a strategic problem. Solar energy is one of the most economical and environmentally friendly renewable energy sources. [0003] At present, the large-scale concentrated use of solar energy is mainly solar power technology. There are two main methods of solar power generation: photovoltaic power generation and solar thermal power generation. Among them, 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 rain and snow. Solar thermal power generation uses huge sunglasses to converge light energy a...

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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