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A low melting point molten salt heat storage material, preparation method and application

A heat storage material, low melting point technology, applied in heat exchange materials, chemical instruments and methods, sustainable manufacturing/processing, etc., can solve problems such as high temperature deterioration, system component damage, and molten salt fluidity deterioration.

Active Publication Date: 2021-04-27
ZHEJIANG ZHENENG TECHN RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a large amount of research work has been carried out on low-melting-point molten salts. The publication numbers are CN105524596A, CN105018045A, CN105567176A, CN105400498A, CN10538540A and N105199678A. Contains Ca(NO 3 ) 2 , while Ca(NO 3 ) 2 It is easy to absorb moisture, has high viscosity, and poor high-temperature thermal stability, which makes the fluidity of molten salt worse, and easily causes local high-temperature deterioration, resulting in damage to system components

Method used

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  • A low melting point molten salt heat storage material, preparation method and application
  • A low melting point molten salt heat storage material, preparation method and application
  • A low melting point molten salt heat storage material, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides a low-melting point molten salt heat storage material, and the composition and content of the single-component salt are shown in Table 1.

[0035] Table 1. Single-component salt ratio in embodiment 1~embodiment 4

[0036]

[0037]

[0038] This embodiment also provides a method for preparing the above-mentioned low melting point molten salt heat storage material, which includes the following steps:

[0039] (1) Put the five kinds of single-component salts into a mortar, crush and grind them separately to make the particle diameter <1mm, then put them in a muffle furnace at 150°C for 12 hours to remove the moisture in the single-component salts, take them out and cool them Finally, grind to 50-200 mesh to obtain anhydrous single-component salt;

[0040] (2) Weigh the anhydrous single-component salt and mix and stir evenly to obtain a mixed salt, put the mixed salt in a muffle furnace at 200°C for 12 hours and melt to obtain a uniform molten ...

Embodiment 2

[0043] This embodiment provides a low-melting point molten salt heat storage material, and the composition and content of the single-component salt are shown in Table 1. The preparation method of the above-mentioned low melting point molten salt heat storage material provided in this example is the same as that in Example 1.

[0044] Tested by DSC image 3 , through analysis, it can be seen that the melting point of the low melting point molten salt is 82.4°C, and the latent heat of phase change is 123.2J / g. Analyzed by TG Figure 4 , The sample has weight loss within 200°C, the weight loss is caused by the volatilization of water in the sample, and there is no weight loss phenomenon at 200-550°C, indicating that the decomposition temperature of the low melting point molten salt is greater than 550°C, so the upper limit temperature of the low melting point molten salt is greater than 550°C . Tested by step cooling curve Figure 9 According to the analysis of the curve in E...

Embodiment 3

[0046] This embodiment provides a low-melting point molten salt heat storage material, and the composition and content of the single-component salt are shown in Table 1. The preparation method of the above-mentioned low melting point molten salt heat storage material provided in this example is the same as that in Example 1.

[0047] Tested by DSC Figure 5 , through analysis, it can be seen that the melting point of the low melting point molten salt is 90.6°C, and the latent heat of phase change is 87.46J / g. Analyzed by TG Figure 6 , The sample has weight loss within 200°C, the weight loss is caused by the volatilization of water in the sample, and there is no weight loss phenomenon at 200-550°C, indicating that the decomposition temperature of the low melting point molten salt is greater than 550°C, so the upper limit temperature of the low melting point molten salt is greater than 550°C . Tested by step cooling curve Figure 9 From the curve in Example 3, it can be see...

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Abstract

The invention relates to a low melting point molten salt heat storage material, preparation method and application, comprising: NaNO 3 、KNO 3 、NaNO 2 、KNO 2 and LiNO 3 Five single-component salts. The beneficial effects of the present invention are: the low-melting-point molten salt heat storage material provided by the present invention is mixed with multiple molten salts to form a eutectic composite molten salt, which not only has the heat transfer performance of nitric acid molten salt, but also has a lower melting point and low corrosion The melting point is around 80°C, and long-term use at a high temperature of 500°C will not cause "salt climbing" (capillary phenomenon of molten salt with high viscosity at high temperature), and the viscosity is low; the eutectic compound prepared by the present invention The melting point of molten salt is about 140°C lower than that of binary Solar Salt nitrate, and about 60°C lower than that of ternary Hitec Salt nitrate, and the operating temperature range is wider than 75°C. 3 ) 2 A series of molten salts have lower viscosity, which can be widely used as high-temperature heat storage and heat transfer medium in the fields of photothermal power generation, heat storage and heat supply, and industrial waste heat recovery.

Description

technical field [0001] The invention relates to the field of photothermal energy storage, and particularly includes a low melting point molten salt heat storage material, a preparation method and an application. Background technique [0002] With the rapid growth of industrial development and energy consumption, the problems of energy security and environmental pollution are becoming more and more serious. In order to change the way of energy development, adjust the energy structure, and achieve the goal of energy conservation and emission reduction, my country vigorously develops clean energy such as solar energy, wind energy, and biomass energy. However, new energy has problems such as intermittency and instability. Storage, transmission and transformation are one of the key technologies to ensure the safe and stable operation of the system. The heat storage and heat transfer media used in the field of industrial heat storage and photovoltaic power generation mainly includ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/12
CPCC09K5/12Y02P20/10Y02P20/129
Inventor 董益华翁建明赵伟杰罗海华刘文涛张艳梅沈强林俊光仇秋玲沙万里
Owner ZHEJIANG ZHENENG TECHN RES INST