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A method for preparing molten salt-ceramic phase change heat storage material

A technology of heat storage material and ceramic phase, which is applied in the field of preparing molten salt-ceramic phase change heat storage material, can solve the problems of low temperature range of polymer, high electrical conductivity of metal material, low high temperature structural strength, etc. The effect of using the environment range, low cost and excellent mechanical properties

Inactive Publication Date: 2021-01-12
UNIV OF SCI & TECH BEIJING +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the molten salt phase change heat storage material has the problems of serious hygroscopicity, easy leakage of molten salt and low structural strength at high temperature.
In order to solve these problems, it is necessary to encapsulate molten salt phase change materials. TEAP and EPS Ltd (Pendyala S. Macroencapsulation of Phase Change Materials for Thermal Energy Storage[J]. Dissertations &Theses - Gradworks, 2012.) use polymer and metal materials respectively Encapsulating the molten salt in the ball body can isolate the molten salt from the external humidity environment and provide a stable structural shape, but this method is not only expensive to prepare but also complicated in process; the lower use temperature range of the polymer, the metal The high conductivity of the material severely limits the application environment in electric heating

Method used

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  • A method for preparing molten salt-ceramic phase change heat storage material
  • A method for preparing molten salt-ceramic phase change heat storage material

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preparation example Construction

[0030] figure 2 A flow chart of a method for preparing a molten salt-ceramic phase change heat storage material according to the present invention is shown. Such as figure 2 As shown, the method for preparing molten salt-ceramic phase change heat storage material according to the present invention comprises the following steps:

[0031] Step 102, selecting a heat storage medium and mixing it to obtain a mixture;

[0032] Step 104, heating the mixture prepared in step 102 to the melting temperature of the mixture or above to turn the mixture into liquid molten salt, cooling and crushing after holding for a certain period of time to prepare high-temperature molten salt particles; or dissolving the mixture prepared in step 102 in water , drying, and crushing after drying to prepare high-temperature molten salt particles;

[0033] Step 106, mixing and stirring the precursor tetrabutyl titanate and absolute ethanol at a volume ratio of 1:2 to 1:4 to obtain a mixed solution, an...

example 1

[0038] Step 1. Preparation of high temperature molten salt particles

[0039] Step 1.1. Select Na2CO3 and K2CO3 as the heat storage medium, mix them at a ratio of 52:48, and use a ball mill to mill at a ball-to-material ratio of 1:1 at a speed of 110 rpm for 30 minutes to mix Na2CO3 and K2CO3 evenly for preparation Hydrated eutectic salt.

[0040] Step 1.2, heating the mixed mixture to 720° C. to form a molten state; keeping the temperature for 2 hours to prepare a molten eutectic salt.

[0041] Step 1.3: Crush and grind the prepared molten eutectic salt into powder, place the powder in spherical abrasives of different diameters, add a small amount of water, press with a pressure of 10Mpa, and place the compressed molten salt particles at 680°C Sintering under certain conditions to prepare molten salt particles of different particle sizes for use.

[0042] Step 2. Coating the eutectic salt particles in the sol-gel process

[0043] Step 2.1. Mix and stir the precursor tetrab...

example 2

[0051] Step 1. Preparation of high temperature molten salt particles

[0052] Step 1.1. Select Na2CO3 and K2CO3 as the heat storage medium, mix them at a ratio of 52:48, and use a ball mill to mill at a ball-to-material ratio of 1:1 at a speed of 110 rpm for 30 minutes to mix Na2CO3 and K2CO3 evenly for preparation Hydrated eutectic salt.

[0053] Step 1.2, heating the mixed mixture to 720° C. to form a molten state; keeping the temperature for 2 hours to prepare a molten eutectic salt.

[0054] Step 1.3: Crush and grind the prepared molten eutectic salt into powder, place the powder in spherical abrasives of different diameters, add a small amount of water, press with a pressure of 10Mpa, and place the compressed molten salt particles at 680°C Sintering under certain conditions to prepare molten salt particles of different particle sizes for use.

[0055] Step 2. Coating the eutectic salt particles in the sol-gel process

[0056] Step 2.1. Mix and stir the precursor tetrab...

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Abstract

The invention discloses a method for preparing molten salt-ceramic phase-change heat-storage material and belongs to the field of phase-change heat-storage materials. The method includes preparing high-temperature molten salt particles, coating eutectic salt in the sol-gel process of a precursor, and subjecting molten salt phase-change samples to press-sintering. The method is simple, low in costand easy to realize large-scale production, solves the problems of high moisture-absorption and low intensity of high-temperature structure of the high-temperature molten salt phase change material, and has a great significance in expanding application environment of the high-temperature phase-change heat-storage material.

Description

technical field [0001] The invention relates to the field of phase change heat storage materials, in particular to a method for preparing molten salt-ceramic phase change heat storage materials. Background technique [0002] Energy storage technology aims to solve the discontinuous problem of energy supply in time and space, and is an effective way to improve energy utilization. It has broad application prospects in aerospace, new energy utilization, industrial heat recovery process and civil building heating. At the same time, compared with chemical power storage, heat storage technology has the advantages of large energy storage capacity, strong stability, and environmental protection, and has broad application prospects in power grid operation systems. "Peak shaving and valley filling" is an important means to reduce the peak load of the power grid, increase the low load, smooth the load curve, and stabilize the operation of the power grid; it is very important to select...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06C04B35/04C04B35/10C04B35/622
CPCC04B35/04C04B35/10C04B35/622C04B2235/3232C04B2235/422C04B2235/442C04B2235/444C09K5/063
Inventor 郝俊杰邓占峰任中凯卢昀坤张高群杨岑玉徐桂芝常亮杜兆龙王天昊吴彬
Owner UNIV OF SCI & TECH BEIJING
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