Novel shape stabilized heat conduction enhanced composite phase change energy storage material and preparation method thereof

A technology of enhanced thermal conductivity and composite phase change, which is applied in the field of materials science and engineering, can solve the problems of low strength of phase change composite energy storage materials, limited sample size, and harsh experimental conditions, and achieve macroscopic shape setting and heat transfer efficiency. The effect of high variable material content and good thermal stability

Active Publication Date: 2020-02-04
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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  • Novel shape stabilized heat conduction enhanced composite phase change energy storage material and preparation method thereof
  • Novel shape stabilized heat conduction enhanced composite phase change energy storage material and preparation method thereof
  • Novel shape stabilized heat conduction enhanced composite phase change energy storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0033] Example 1

[0034] Iron tailings: The raw material used in this example is mud-like fine-particle iron tailings produced by Beijing Miyun Shouyun Mining Group Company in 2017 after iron ore selection, 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 14.7 wt.%, 8.7wt.% MgO, Al 2 O 3 6.8wt.%, CaO 6.6wt.%, K 2 O1.6wt.%, other ingredients 1.5wt.%.

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

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

[0037] Weigh 45 g of iron tailings powder, 90 g of agate balls, and 55 ml of deionized water, put them in a ball mill tank and mix the...

Embodiment 2

[0042] Iron tailings: the raw materials used in this example are the same as those in example 1

[0043] Paraffin: the raw materials used in this example are the same as those in example 1

[0044] Graphene: the raw materials used in this example are the same as those in example 1

[0045] Weigh 50g of iron tailings powder, 100g of agate balls, and 50ml of deionized water, put them in a ball mill tank and mix for 36 hours with a roller ball mill to prepare a slurry with a solid content of 50 wt.%. Weigh 5 g of organic monomer, 0.5 g of cross-linking agent and 3 g of dispersant into the slurry and continue ball milling for 2 hours. Weigh 0.075g foaming agent and 0.02g foam stabilizer into the slurry, and mechanically stir for 5 minutes at a stirring speed of 1500r / min for foaming. Weigh 0.25 g of catalyst and 0.2 g of initiator into the foam-containing slurry and stir evenly, pour the slurry into a steel mold, and release the slurry after gel formation and dry. Put the formed body ...

Embodiment 3

[0048] Iron tailings: the raw materials used in this example are the same as those in example 1

[0049] Paraffin: the raw materials used in this example are the same as those in example 1

[0050] Graphene: the raw materials used in this example are the same as those in example 1

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

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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 present invention relates to the field of material science and engineering technology, in particular to a shaped heat conduction enhanced composite phase change energy storage material using paraffin wax as a phase change material, graphene as a thermal conductivity enhancement material, and iron tailing porous ceramics as a carrier, and the same Preparation. Background technique [0002] In the field of clean energy utilization such as industrial waste heat recovery and solar energy, in order to better match the time of energy supply and demand, the development and utilization of thermal energy storage materials are essential. Among them, latent heat 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 thermal stability during the phase change process, so it has advantages in heat storage, electronic refrigeration and building energy manage...

Claims

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Application Information

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Patent Type & Authority Applications(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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