Assembly method of expanded graphite reinforced heat conduction ceramic-based shaped high-temperature phase change heat storage element and heat storage element formed by assembly method

An assembly method and technology of expanded graphite, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of easy corrosion, low thermal conductivity, etc., and achieve the effect of high heat exchange efficiency and high heat storage density

Active Publication Date: 2020-10-20
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of low thermal conductivity and easy corrosion of the high-temperature inorganic salt phase-change heat storage materials in the prior art, the present invention provides an assembly method of a ceramic-based high-temperature phase-change heat storage element with expanded graphite enhanced heat conduction and its composition The heat storage element formed by this

Method used

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  • Assembly method of expanded graphite reinforced heat conduction ceramic-based shaped high-temperature phase change heat storage element and heat storage element formed by assembly method

Examples

Experimental program
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Effect test

Embodiment 1

[0019] NaCl, KCl, MgCl 2 Mix by ball milling at a eutectic ratio of 5:3:2, dry, heat to 560°C in a reaction kettle protected by 2 atmospheres and argon, and equilibrate for 4 hours until the salt is completely melted to form a uniform eutectic salt.

[0020] The natural flake graphite is expanded, and then subjected to high-temperature graphitization treatment to remove impurities to obtain expanded graphite.

[0021] Alumina powder and 6% methylcellulose were evenly mixed to form a skeleton material.

[0022] The skeleton material and the eutectic salt are uniformly mixed according to a mass ratio of 3:2 to form a composite phase change material, and 10wt% of expanded graphite is added to the composite phase change material as a heat conducting agent.

[0023] A uniaxial static pressure process is used to press and form under the condition of a pressure of 12-14 MPa to obtain a columnar green body.

[0024] The heat storage element was obtained by sintering at 520°C, and it...

Embodiment 2

[0026] NaCl, KCl, MgCl 2 Mix by ball milling at a eutectic ratio of 5:3:2, dry, heat to 560°C in a reaction kettle protected by 2 atmospheres and argon, and equilibrate for 4 hours until the salt is completely melted to form a uniform eutectic salt.

[0027] The natural flake graphite is expanded, and then subjected to high-temperature graphitization treatment to remove impurities to obtain expanded graphite.

[0028] Alumina powder and 6% methylcellulose were evenly mixed to form a skeleton material.

[0029] The skeleton material and the eutectic salt are uniformly mixed according to a mass ratio of 3:2 to form a composite phase change material, and 15wt% of expanded graphite is added to the composite phase change material as a heat conducting agent.

[0030] A uniaxial static pressure process is used to press and form under the condition of a pressure of 12-14 MPa to obtain a columnar green body.

[0031] Sintering at 520°C to obtain a heat storage element.

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Abstract

The invention relates to an assembly method of an expanded graphite reinforced heat conduction ceramic-based shaped high-temperature phase change heat storage element. The assembly method comprises the following steps: providing an eutectic salt phase change material; providing an expanded graphite heat conducting agent; providing a ceramic powder framework material and a sintering aid; mixing theeutectic salt phase-change material, an expanded graphite heat-conducting agent, a ceramic powder framework material and a sintering aid, putting the mixture into a mold, and performing compression molding at 12-14MPa to obtain a green body; and carrying out heat treatment on the blank to obtain the heat storage element. The invention also relates to a heat storage element formed by the assemblymethod. The heat storage element comprises an eutectic salt phase change material, an expanded graphite heat conduction agent and a ceramic powder framework material. The heat conducting agent expanded graphite material adopted by the high-temperature phase change heat storage element provided by the invention is more resistant to high temperature and corrosion than metal, can be better compatibleand has good thermal cycle performance, and an effective component of the high-temperature phase change material with high heat conductivity and corrosion resistance is provided.

Description

technical field [0001] The invention relates to a phase-change heat storage material, and more particularly to an assembly method of a ceramic-based shaped high-temperature phase-change heat storage element with expanded graphite enhanced heat conduction and the heat storage element formed therefrom. Background technique [0002] Phase change heat storage materials absorb or release a large amount of heat through phase change to realize energy storage and utilization, which can effectively solve the contradiction between heat energy supply and demand mismatch. Therefore, phase change heat storage technology is widely used in the above-mentioned field of thermal management with discontinuity or instability. Medium and low temperature (room temperature-200°C) phase change heat storage technology is relatively mature, while high-temperature inorganic salts (chloride, carbonate and nitrate, etc., phase change point 200-1000°C) are suitable for nuclear energy and solar heat stora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C09K5/14
CPCC09K5/063C09K5/14
Inventor 仲亚娟冉晓峰林俊
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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