A composite phase-change energy storage material with enhanced heat conduction and preparation method thereof

A technology of enhanced thermal conductivity and composite phase change, which is applied in the field of material science and engineering, can solve the problems of low strength, complex preparation process, and harsh experimental conditions of phase change composite energy storage materials, and achieve macroscopic shape setting and heat transfer efficiency improvement. The effect of simple infiltration process and good thermal stability

Active Publication Date: 2020-09-08
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phase-change composite energy storage material has low strength, poor stability, limited sample size, high cost, complex preparation process, harsh experimental conditions, and narrow application range.

Method used

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  • A composite phase-change energy storage material with enhanced heat conduction and preparation method thereof
  • A composite phase-change energy storage material with enhanced heat conduction and preparation method thereof
  • A composite phase-change energy storage material with enhanced heat conduction and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0033] Example 1

[0034] Iron tailings: The raw materials used in this example are muddy fine-grain iron tailings produced by Shouyun Mining Group Company in Miyun District, Beijing after iron ore selection in 2017, with an average particle size of 10.74 μm. The mass percentage of tailings composition is as follows: SiO 2 60.1wt.%, Fe 2 o 3 14.7wt.%, 8.7wt.% MgO, Al 2 o 3 6.8wt.%, CaO 6.6wt.%, K 2 O 1.6wt.%, other components 1.5wt.%.

[0035] Paraffin wax: The melting point of the phase change material paraffin used in this example is 52-58° C., and the latent heat of phase change is 193 J / g.

[0036] Graphene: the high thermal conductivity nano-graphene used in this example has a lateral dimension of 2-3 μm and a bulk density of 0.2 g / mL.

[0037] Weigh 45g of iron tailings powder, 90g of agate balls, and 55ml of deionized water, p...

Embodiment 2

[0042] Iron tailings: raw material used in this embodiment is the same as embodiment 1

[0043] Paraffin: raw material used in the present embodiment is the same as embodiment 1

[0044] Graphene: raw material used in the present embodiment is the same as embodiment 1

[0045] Weigh 50 g of iron tailings powder, 100 g of agate balls, and 50 ml of deionized water, put them into a ball mill tank and roll and ball mill and mix for 36 hours to prepare a slurry with a solid content of 50 wt.%. Weigh 5 g of organic monomer, 0.5 g of crosslinking agent and 3 g of dispersant and inject into the slurry to continue ball milling for 2 hours. Weigh 0.075g of foaming agent and 0.02g of foam stabilizer and inject into the slurry, and mechanically stir for 5 minutes at a stirring speed of 1500r / min to foam. Weigh 0.25g of catalyst and 0.2g of initiator into the foam-containing slurry and stir evenly. Pour the slurry into a steel mold. After the slurry gel is formed, it is demolded and drie...

Embodiment 3

[0048] Iron tailings: raw material used in this embodiment is the same as embodiment 1

[0049] Paraffin: raw material used in the present embodiment is the same as embodiment 1

[0050] Graphene: raw material used in the present embodiment is the same as embodiment 1

[0051] Weigh 40g of iron tailings powder, 80g of agate balls, and 60ml of deionized water, and put them into a ball mill tank for roller milling and mixing for 12 hours to prepare a slurry with a solid content of 40wt.%. Weigh 6g of organic monomer, 0.6g of crosslinking agent and 0.15g of dispersant and inject into the slurry to continue ball milling for 2 hours. Weigh 0.15 g of foaming agent and 0.04 g of foam stabilizer and inject into the slurry, and mechanically stir for 5 minutes at a stirring speed of 800 r / min for foaming. Weigh 1.75g ​​of catalyst and 1.2g of initiator into the foam-containing slurry and stir evenly. Pour the slurry into a steel mold. After the slurry gel is formed, it is demolded and...

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Abstract

The invention relates to a novel shape stabilized heat conduction enhanced composite phase change energy storage material and a preparation method thereof. The preparation method comprises the following steps: (1) adding high thermal conductivity nano graphene into molten paraffin wax, uniformly dispersing graphene in paraffin wax through stirring and ultrasonic vibration to obtain graphene / paraffin wax mixed solution; (2) using iron tailings as raw materials to prepare high porosity iron tailings porous ceramics by foaming and casting method; (3) immersing iron tailings porous ceramics in graphene / paraffin mixed solution, and preparing shape stabilized heat conductivity enhanced composite phase change energy storage materials through melt infiltration. The invention solves the problems oflow thermal conductivity, slow heat transfer efficiency, easy leakage, inability to set shape after melting and the like existing in the phase change material. At the same time, the preparation costof the composite phase change material is greatly reduced, the mechanical properties, thermal properties and stability of the composite phase change material are improved, the application field of thephase change material is effectively expanded, and a new direction is provided for the resource utilization of iron tailings.

Description

technical field [0001] The invention relates to the field of material science and engineering technology, in particular to a shape-setting heat conduction enhanced composite phase change energy storage material with paraffin as a phase change material, graphene as a heat conduction enhancement material, and iron tailings porous ceramics as a carrier and its Preparation. Background technique [0002] In the field of industrial waste heat recovery, solar energy and other clean energy utilization, in order to better match the energy supply and demand time, the development and utilization of thermal energy storage materials are essential, among which latent heat energy storage is one of the most effective ways of thermal energy storage. Phase change material (PCM) has high energy storage density, nearly constant temperature and good thermophysical stability during the phase change process, so it has great potential in heat storage, electronic refrigeration and building energy ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06C04B33/132C04B38/10
CPCC04B33/1324C04B38/10C09K5/063Y02P20/10Y02P40/60
Inventor 周洋李润丰刘晓倩李翠伟李世波黄振莺于文波翟洪祥
Owner BEIJING JIAOTONG UNIV
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