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A carbon-based composite phase-change energy storage material and preparation method thereof

A technology for composite phase change and energy storage materials, which is applied in the field of carbon-based composite phase change energy storage materials and their preparation, can solve the problems of difficult packaging and low heat storage efficiency, and achieves guaranteed use performance, simplified preparation process, and improved preparation. low cost effect

Active Publication Date: 2020-11-10
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of low heat storage efficiency and difficult encapsulation of medium-temperature phase-change energy storage materials in the prior art, the present invention provides a carbon-based composite phase-change energy storage material and a preparation method thereof. The adjustment of carbon-based composite phase change energy storage materials with high thermal conductivity, no flow in the solid-liquid phase change process, and high latent heat of phase change can be obtained.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0035] This embodiment provides a method for preparing a carbon-based composite phase-change energy storage material, including the following steps:

[0036] 1) Mix 100g of lithium carbonate and 150g of potassium nitrate, mix evenly, place in an alumina crucible, heat in a muffle furnace at 900°C for 2h to obtain a mixed molten salt of lithium carbonate-potassium nitrate;

[0037] 2) Add 44.1 g of potassium chloride (KCl) as a flux to the mixed molten salt obtained in step 1), and heat at 800° C. for 2 hours in a muffle furnace to obtain a melting point (obtained by differential thermal analysis) of 450° C. Eutectic molten salt;

[0038] 3) Grind the low-melting eutectic molten salt obtained in step 2) to -50 mesh to 200 mesh and place it in a ball mill jar, add 15.6 g of graphene, grind and mix for 2 hours at a speed of 400 r / min by ball mill , to obtain a uniformly mixed graphene / eutectic molten salt powder; wherein the particle size of the graphene / eutectic molten salt pow...

Embodiment 2

[0041] This embodiment provides a method for preparing a carbon-based composite phase-change energy storage material, including the following steps:

[0042] 1) Mix 50g of lithium carbonate and 200g of potassium nitrate, mix evenly and place in an alumina crucible, heat in a muffle furnace at 900°C for 2h to obtain a mixed molten salt of lithium carbonate-potassium nitrate;

[0043] 2) Add 27.8g potassium chloride (KCl) as a flux to the mixed molten salt obtained in step 1), and heat at 800°C for 2h in a muffle furnace to obtain a melting point of 400°C (obtained by differential thermal analysis). Eutectic molten salt;

[0044] 3) Grind the low-melting-point eutectic molten salt obtained in step 2) to below 50 mesh, and place it in a ball mill jar, add 24.5g of graphene, grind and mix for 2 hours at a speed of 400r / min by ball milling, and obtain Mix the graphene / eutectic molten salt powder evenly. Among them, the particle size of graphene / mixed molten salt powder should be ...

Embodiment 3

[0047] This embodiment provides a method for preparing a carbon-based composite phase-change energy storage material, including the following steps:

[0048] 1) Mix 62.5g of lithium carbonate and 187.5g of potassium nitrate, mix evenly, place in an alumina crucible, and heat in a muffle furnace at 900°C for 2h to obtain a mixed molten salt of lithium carbonate-potassium nitrate;

[0049] 2) Add 30 g of potassium chloride (KCl) as a flux to the mixed molten salt obtained in step 1), and heat at 800° C. for 2 h in a muffle furnace to obtain a total melting point of 430° C. (obtained by differential thermal analysis). crystal molten salt;

[0050] 3) Grind the low-melting-point eutectic molten salt obtained in step 2) to below 50 mesh, and place it in a ball mill jar, add 27.8g of graphene, grind and mix for 2 hours at a speed of 400r / min by ball milling, and obtain Mix the graphene / eutectic molten salt powder evenly. Among them, the particle size of graphene / mixed molten salt ...

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Abstract

The invention relates to a carbon-based phase-change energy storage material and a preparation method thereof. The preparation method comprises the following steps: taking lithium carbonate and potassium nitrate as raw materials, and heating after uniformly mixing, thus obtaining mixed molten salt of lithium carbonate-potassium nitrate; adding potassium chloride in the mixed molten salt, and heating, thus obtaining low-melting point eutectic molten salt; grinding the eutectic molten salt into powder, adding graphene, and uniformly mixing, thus obtaining graphene / eutectic molten salt powder; uniformly mixing the graphene / eutectic molten salt powder with an expansible graphite matrix, thus obtaining graphene / mixed molten salt powder; carrying out cold-press molding on the graphene / mixed molten salt powder, thus obtaining a sample in regular shape; drying the sample, cooling to room temperature, and patching, thus obtaining the carbon-based phase-change energy storage material. Accordingto the carbon-based phase-change energy storage material disclosed by the invention, the graphene is added in an eutectic salt medium, the heat conductivity coefficient of a phase-change medium is increased on the premise that higher potential heat of the eutectic molten salt is reserved, and excellent heat storage efficiency is obtained.

Description

technical field [0001] The invention belongs to the technical field of preparation of composite phase-change energy storage materials, and in particular relates to a carbon-based composite phase-change energy storage material and a preparation method thereof. Background technique [0002] With the increase of the world's population, human beings' demand for modern industrial products is also increasing, and large-scale industrial production produces a large amount of industrial waste gas. The emission of industrial flue gas not only causes energy waste, but also brings increasingly serious environmental pollution problems. According to the temperature of waste heat, flue gas can be divided into high temperature flue gas (>600°C), medium temperature flue gas (230~600°C) and low temperature flue gas (<230°C). In the process of recycling waste heat resources using phase change heat storage technology, the waste heat utilization of high-temperature and low-temperature flu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063Y02E60/14
Inventor 孙现凯张世超陈玉峰孙浩然
Owner CHINA BUILDING MATERIALS ACAD
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