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Carbonate molten heat transmission and thermal storage medium, preparation thereof and applications

A technology of carbonate molten salt and heat storage medium, which is applied in chemical instruments and methods, heating devices, solar thermal devices, etc., can solve rare and other problems, and achieve the goal of improving heat storage capacity, widening the working temperature range, and large latent heat of phase change Effect

Active Publication Date: 2008-10-22
广东宏达工贸集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, domestic and foreign researches on carbonate molten salts are mainly focused on fuel cell applications, and a small amount of research attempts to use carbonate molten salts to recycle nuclear waste, but the use of carbonate molten salts as solar heat utilization, heat transfer and heat storage materials is still relatively rare

Method used

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  • Carbonate molten heat transmission and thermal storage medium, preparation thereof and applications
  • Carbonate molten heat transmission and thermal storage medium, preparation thereof and applications
  • Carbonate molten heat transmission and thermal storage medium, preparation thereof and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Mix sodium chloride and potassium chloride with a mass ratio of 0.1:1 and stir evenly, statically heat until the solids are completely melted, keep the temperature for 10 minutes, and then naturally cool to room temperature to obtain the additive.

[0034] 37% by mass of potassium carbonate, 53% of sodium carbonate, and 10% of the additives were mixed and stirred evenly, heated statically until the solids were completely melted, then kept warm for 10 minutes, and then naturally cooled to room temperature to obtain the modified Molten salt heat transfer heat storage medium.

[0035] The melting point and latent heat of phase change of the prepared carbonate molten salt were tested. The test is carried out with a general-purpose differential scanning (DSC) instrument. The DSC curve obtained from the test is as follows figure 1 Shown in curve b. Adopt the same method to test the unmodified molten salt, the DSC curve obtained by the test is as follows figure 1 As shown ...

Embodiment 2

[0040] Mix sodium chloride and potassium chloride with a mass ratio of 0.6:1 and stir evenly, statically heat until the solids are completely melted, keep the temperature for 30 minutes, and then naturally cool to room temperature to obtain the additive.

[0041] Mix 45% potassium carbonate, 39% sodium carbonate, and 16% of the additive by mass and stir evenly, heat statically until the solids are completely melted, then keep the temperature for 10 minutes, and then cool naturally to room temperature to obtain the modified Molten salt heat transfer heat storage medium.

[0042] The melting point and latent heat of phase change of molten salt are tested. Test method is the same as embodiment 1. The test results show that the melting point of the modified molten salt does not change much compared with Example 1, and the latent heat of phase change increases to a large extent.

[0043] The thermal stability performance of molten salt media was tested. Test method is the same a...

Embodiment 3

[0045] Mix sodium chloride and potassium chloride with a mass ratio of 0.2:1, stir evenly, heat statically until the solids are completely melted, keep the temperature for 15 minutes, and cool naturally to room temperature to obtain the additive.

[0046] Mix 34% potassium carbonate, 46% sodium carbonate, and 20% of the additive by mass and stir evenly, heat statically until the solids are completely melted, then keep the temperature for 10 minutes, and then cool naturally to room temperature to obtain the modified Molten salt heat transfer heat storage medium.

[0047] The melting point and latent heat of phase change of molten salt are tested. Test method is the same as embodiment 1. The DSC curve of the test is as figure 2 shown. The results show that the melting point of the modified molten salt prepared in this example does not change much compared with Example 1, and the latent heat of phase change increases to a greater extent than Example 2, reaching 78J / g.

[004...

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Abstract

The invention discloses a molten carbonate heat-transfer and heat-storage medium, a method for making the same and a user of the same. The molten carbonate heat-transfer and heat-storage medium comprises potassium carbonate, sodium carbonate and an addition agent, wherein the addition agent consists of sodium chloride and potassium chloride with the mass ratio ranging between 0.1:1 and 0.9:1. The molten carbonate heat-transfer and heat-storage medium can meet the requirements of the operating temperature range required by a solar thermochemical reactor, and has ideal thermal stability and great phase change latent heat; moreover, the medium is undemanding in system size and energy, and has high energy utilization rate and excellent energy-conservation effect.

Description

technical field [0001] The invention relates to solar medium and high temperature heat utilization technology, in particular to a carbonate molten salt heat transfer heat storage medium and its preparation method and application. Background technique [0002] Solar energy has the disadvantages of intermittent and unstable supply, which cannot meet the requirements of large-scale industrial continuous energy supply. In order to effectively solve the conversion, storage and transportation problems of renewable energy, it is necessary to develop efficient heat transfer and heat storage technology. In the medium and high temperature heat utilization technology of solar energy, the heat transfer and heat storage media currently used mainly include: air, mixed oil, water / steam, metals such as sodium and aluminum, and molten salts. Among them, molten salt as a heat transfer medium can reach a higher temperature, and at the same time has the function of heat storage, and can also o...

Claims

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Application Information

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IPC IPC(8): C09K5/12C01B3/04F24J2/00
CPCY02E60/364Y02E10/40Y02E60/36Y02P20/133
Inventor 魏小兰丁静廖敏杨晓西杨建平
Owner 广东宏达工贸集团有限公司
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