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Polynitrate/graphene/nanoparticle shaped composite phase-change heat storage material and preparation method thereof

A nanoparticle, composite phase change technology, applied in the direction of heat exchange materials, chemical instruments and methods, can solve the problem of increasing the thermal resistance of heat transfer medium and phase change material, unable to meet the requirements of high temperature heat transfer and heat storage, molten salt The problem of high melting point is to improve the latent heat energy storage of phase change, good thermal stability and chemical stability, and high energy storage density.

Inactive Publication Date: 2017-12-22
DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molten salt of a single component has a high melting point and poor thermal stability, which cannot meet the requirements of high-temperature heat transfer and heat storage in various fields. Therefore, people often mix different salts to form mixed molten salts. Liquid conversion requires the use of special container packaging, which increases the thermal resistance between the heat transfer medium and the phase change material, reduces the heat transfer efficiency, and increases the cost accordingly, and has serious disadvantages such as high temperature corrosion.

Method used

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  • Polynitrate/graphene/nanoparticle shaped composite phase-change heat storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add vermicular expanded graphite to the mixed solution of sulfuric acid and phosphoric acid with a volume ratio of 1:8, stir at 0°C at low temperature, add potassium permanganate for oxidation, continue stirring at 50°C for 10h, wash and centrifugally dry , and then reduced by hydrazine hydrate at 180 °C for 10 h to obtain modified network expanded graphene.

[0028] (2) According to the weight ratio of the nitrate mixture and the modified network expanded graphene is 1:0.005, the mixture of calcium nitrate and sodium nitrate with a molar mass ratio of 3:7 is mixed with the modified network expanded graphene, add water Stir to form a suspension, evaporate and dry at 98°C for 3h, place in a muffle furnace for pre-sintering at 280°C for 2h, and cool to room temperature to obtain a granular nitrate-loaded graphene composite.

[0029] (3) After the granular nitrate-loaded graphene composite material and nano-silica ball milled for 1 hour, it was molded under a pressure ...

Embodiment 2

[0031] (1) Add worm-like expanded graphite to a mixed solution of sulfuric acid and phosphoric acid with a volume ratio of 1:9, stir at 5°C at low temperature, add hydrogen peroxide for oxidation, continue stirring at 55°C for 12h, wash and centrifugally dry, Then, it was reduced by hydrazine hydrate at 200°C for 12 hours to obtain modified network-shaped expanded graphene.

[0032] (2) According to the weight ratio of the nitrate mixture and the modified network expanded graphene is 1:0.15, the mixture of calcium nitrate and potassium nitrate with a molar ratio of 6:4 is mixed with the modified network expanded graphene, add water and stir , forming a suspension, evaporated and dried at 102° C. for 3 h, placed in a muffle furnace for pre-sintering at 260° C. for 1.5 h, and cooled to room temperature to obtain a granular graphene composite material loaded with nitrate.

[0033] (3) After the granular nitrate-loaded graphene composite material and nano-titanium dioxide ball mil...

Embodiment 3

[0035] (1) Add worm-like expanded graphite to a mixed solution of sulfuric acid and phosphoric acid with a volume ratio of 1:8.5, stir at 2°C at low temperature, add potassium permanganate for oxidation, continue stirring at 52°C for 11 hours, wash and centrifugally dry , and then reduced by hydrazine hydrate at 190 ° C for 11 h to obtain modified network expanded graphene.

[0036](2) According to the weight ratio of the nitrate mixture and the modified network expanded graphene is 1:0.01, the mixture of calcium nitrate, sodium nitrate and potassium nitrate and the modified network expanded graphite with a molar ratio of 5:3:2 Graphene mixed with water, stirred with water to form a suspension, evaporated and dried at 100°C for 2h, placed in a muffle furnace for pre-sintering at 320°C for 2.5h, cooled to room temperature to obtain a granular nitrate-loaded graphene composite material.

[0037] (3) After the granular nitrate-loaded graphene composite material and nano-silica ba...

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Abstract

The invention provides a multi-component nitrate / graphene / nanoparticle shaped composite phase change heat storage material and a preparation method thereof. The specific method is: adding worm-like expanded graphite into a mixed solution of sulfuric acid and phosphoric acid, stirring at low temperature, and adding an oxidizing agent Oxidation, washing, centrifugal drying, and reduction with hydrazine hydrate to obtain modified network expanded graphene; stir the nitrate mixture and modified network expanded graphene with water to form a suspension, evaporate to dryness, pre-sinter, and cool to room temperature to obtain Granular nitrate-loaded graphene composite material; after the granular nitrate-loaded graphene composite material is ball-milled with nanoparticles, it is pressed into a mold, demoulded, then sintered in a muffle furnace, and cooled to room temperature , to obtain multi-component nitrate / graphene / nanoparticle shaped composite phase change heat storage material. The shaped composite phase change heat storage material prepared by the invention has high energy storage density per unit volume, stable chemical performance, high strength and low cost.

Description

technical field [0001] The invention belongs to the technical field of phase-change heat storage materials, and in particular relates to a multi-component nitrate / graphene / nanoparticle shaped composite phase-change heat storage material and a preparation method thereof. Background technique [0002] Phase change heat storage technology can store energy in a certain form when heat energy supply is sufficient, and release energy when heat energy supply is insufficient. Phase change heat storage technology can not only alleviate energy demand and supply in time and space. It can achieve reasonable and effective allocation of energy, and can ensure the stability of equipment operation, achieve the purpose of energy saving and high efficiency, and have broad application prospects in energy saving and emission reduction. [0003] Heat storage technology can be divided into sensible heat energy storage, latent heat energy storage and chemical reaction heat energy storage. Among the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 陈东进
Owner DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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