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Molten salt heat transfer and storage medium suitable for high-temperature occasions, preparation method and application

A heat storage medium, high temperature molten salt technology, applied in chemical instruments and methods, energy storage, reduction of greenhouse gases, etc., can solve the problems of low heat of solution, easy decomposition, low thermal conductivity, etc. The effect of stable properties and simple preparation process

Pending Publication Date: 2022-06-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a heat transfer and heat storage material, the nitric acid molten salt system has the disadvantages of small heat of solution and low thermal conductivity, and is easy to decompose at high temperatures. The upper limit of the use temperature generally does not exceed 600°C, and it is not suitable for use in the range of 600°C to 800°C. high temperature applications of solar

Method used

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  • Molten salt heat transfer and storage medium suitable for high-temperature occasions, preparation method and application
  • Molten salt heat transfer and storage medium suitable for high-temperature occasions, preparation method and application
  • Molten salt heat transfer and storage medium suitable for high-temperature occasions, preparation method and application

Examples

Experimental program
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preparation example Construction

[0041] The preparation method of the high-temperature molten salt heat transfer and heat storage medium mainly comprises the following steps:

[0042] Step S01: select K of analytical purity>99.9% 2 CO 3 , Na 2 CO 3 , Li 2 CO 3 and NaF. Put them in high temperature resistant heating dishes respectively, preheat them in an oven for at least 1 to 2 days, the preheating temperature is about 160 ℃ ~ 200 ℃, remove K 2 CO 3 , Na 2 CO 3 , Li 2 CO 3 and some of the moisture contained in NaF.

[0043] Step S02: adopt high-precision analytical balance to weigh the K of the above-mentioned mass fraction meter 2 CO 3 , Na 2 CO 3 , Li 2 CO 3 and NaF raw material components;

[0044] Step S03: grind all raw material components taken by weighing, then stir to make it fully mixed, place heating equipment muffle furnace, heat in an atmosphere of inert gas, and the heating temperature is the estimated melting point temperature of this molten salt. Above about 50 ° C ~ 100 ° C...

Embodiment 1-15

[0047] By choosing the formula that meets the above molten salt (K 2 CO 3 25~40 servings; Na 2 CO 3 15-40 servings; Li 2 CO 3 20-40 parts; NaF 5-20 parts) of each raw material component, the high-temperature molten salt heat-transfer and heat-storage medium is obtained by the above-mentioned preparation method of a high-temperature molten-salt heat-transfer and heat-storage medium. In order to reflect the scientificity of the described ranges of components, the thermophysical parameters are tested by using molten salts of different proportions. Table 3 shows 15 different proportions of molten salts from Examples 1 to 15 and their basic nature.

[0048] table 3

[0049]

[0050]

[0051] From the above table it can be seen that:

[0052] When the raw material components taken are 30-35 parts of potassium carbonate, 30-40 parts of lithium carbonate, and 5-15 parts of sodium fluoride, the melting point of the obtained mixed molten salt is roughly around 400°C, which ...

Embodiment 16-30

[0057] A molten salt heat transfer and heat storage medium suitable for high temperature occasions, including the following raw materials in parts by mass, and each part has the same quality:

[0058] K 2 CO 3 : 25 to 40 servings;

[0059] Na 2 CO 3 : 15 to 40 servings;

[0060] Li 2 CO 3 : 20 to 40 servings;

[0061] KF: 5 to 20 parts.

[0062] The high-temperature molten salt heat-transfer and heat-storage medium is obtained by the above-mentioned preparation method of the high-temperature molten-salt heat-transfer and heat-storage medium by selecting each raw material component conforming to the above-mentioned molten-salt formula.

[0063] Table 4

[0064]

[0065]

[0066] From the above table, when potassium carbonate is 25 to 30 parts, lithium carbonate is 30 to 35 parts, and potassium fluoride is 6 to 20 parts, the melting point of the obtained mixed molten salt is basically around 400 ℃. would be better. Among them, the melting point of Example 24 is ...

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Abstract

The invention discloses a fused salt heat transfer and storage medium suitable for a high-temperature occasion, a preparation method and application, relates to the technical field of energy storage, heat transfer and heat storage materials, and particularly discloses the fused salt heat transfer and heat storage medium suitable for the high-temperature occasion. The high-temperature molten salt heat transfer and storage medium is prepared from the following raw materials in parts by mass: 25-40 parts of K2CO3; 15 to 40 parts of Na2CO3; 20 to 40 parts of Li2CO3; 5 to 20 parts of NaF; the high-temperature fused salt heat transfer and storage medium provided by the invention has the advantages of wider working temperature range, higher decomposition temperature, good thermal stability and good heat transfer and storage performance, and is very suitable for medium-high temperature photo-thermal power generation, industrial heat storage, solar high-temperature heat storage and heat transfer and storage of clean energy boilers.

Description

technical field [0001] The invention belongs to the technical field of heat storage and transfer, and in particular relates to a molten salt heat transfer heat storage medium suitable for high temperature occasions, a preparation method and an application. Background technique [0002] At present, the most widely used molten salt is the solar salt Solarsalt (60% NaNO 3 +40% KNO 3 , wt%), almost all commercial solar thermal power stations worldwide use it as a heat storage medium, the melting point of the molten salt is about 220 °C, but the maximum operating temperature is about 585 °C. The other is Hitec salt (7% NaNO 3 +53%KNO 3 +40%NaNO 2 , wt%), its melting point is relatively low, about 142 °C, some researchers believe that the highest operating temperature can reach 450 °C, but NaNO is found in engineering applications 2 There is a phenomenon of slow oxidative decomposition, so some engineers suggest that the maximum operating temperature should not exceed 350 °C ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063Y02E70/30
Inventor 毕胜山秦鑫宇唐旭尧冯敏娜张可张园
Owner XI AN JIAOTONG UNIV