Abstract
At present, thermal storage is considered as one of the key technologies to alleviate the problem of instability and intermittence for renewable energy. Due to relatively high latent heat, latent heat storage by molten salt is considered to a potential technology. Because of the restriction of different thermophysical parameters, the application of latent heat storage by molten salt has many technical obstacles. So, it is an urgent work to find a better mixed molten salt formula with comprehensive thermophysical properties. In this paper, we selected halogen salts (NaCl, NaF) and alkali (NaOH) to prepare binary mixed molten salts. From the results, for the mixed molten salt of NaCl-NaOH, NaCl:NaOH=1:9 has a maximum latent heat value of 301.2J/g. The initial melting temperature is about 200°C. With the increase of the mass ratio of NaCl, the termination melting temperature increases firstly then decreases. For mixed molten salt of NaF-NaOH, NaF:NaOH=1:9 has a maximum latent heat value of 199.5J/g, the initial and termination melting temperatures are about 265°C and 380°C, repectively. The latent heat value of NaCl-NaOH and NaF-NaOH mixed molten salts decreased with the increase of the mass ratio of halogen salts.
Highlights
Energy is the foundation of modern society and economic development
The sensible heat of molten salt is used for heat storage, and the preparation of molten salt mostly considers the characteristics of low melting point, high specific heat, high decomposition temperature, low viscosity, high thermal conductivity, and low corrosion
The latent heat value decreases as the mass ratio of NaCl increases
Summary
Energy is the foundation of modern society and economic development. Today, China has changed from traditional fossil energy to developing renewable energy, but one of the key technologies to achieve large-scale application of renewable energy is energy storage technology. The sensible heat of molten salt is used for heat storage, and the preparation of molten salt mostly considers the characteristics of low melting point, high specific heat, high decomposition temperature, low viscosity, high thermal conductivity, and low corrosion. Latent heat storage has some challenges, such as improving the thermal conductivity of molten salt, increasing the heat transfer area, improving the uniformity of heat transfer, and preparing economical high latent heat and low melting point homogeneous mixed molten salt. In the mixed molten salt of alkali and salt, low melting point and higher latent heat value can be obtained, which is a method worth trying. In this paper, starting from the demand for latent heat, while considering economy, first select the unit salt with high latent heat (NaCl, NaF), and choose the unit salt with low melting point (NaOH). Prepare the binary molten salt with the same cation mixed with salt (NaCl, NaF) and alkali (NaOH), and explore high latent heat molten salt
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