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High-temperature composite phase-change heat storage material with multi-core-shell structure, and preparation method and application thereof

A technology of composite phase change and heat storage materials, applied in the field of heat storage materials, can solve the problems of harsh selection of phase change materials and ceramic materials, loss and evaporation of molten salt, limited content of inorganic salts, etc., and achieve excellent high temperature stability and mechanical Strength, good thermal conductivity, high temperature effect

Inactive Publication Date: 2020-09-29
SHANXI LUAN MINING GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mixed sintering method is to add inorganic salts and additives to the ceramic ingredients, shape, and sinter at high temperature. The disadvantage is that the molten salt loss and evaporation are serious, the mechanical strength is low, and the selection of phase change materials and ceramic materials is very harsh.
The melt infiltration method first prepares a porous ceramic matrix with a connected network structure, and then melts and infiltrates the inorganic salt into the ceramic matrix. The disadvantages are complex process, high cost, and limited content of inorganic salts.
Moreover, the operating temperature of current phase change heat storage materials is not higher than 300°C, and its high temperature resistance is poor.

Method used

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  • High-temperature composite phase-change heat storage material with multi-core-shell structure, and preparation method and application thereof
  • High-temperature composite phase-change heat storage material with multi-core-shell structure, and preparation method and application thereof
  • High-temperature composite phase-change heat storage material with multi-core-shell structure, and preparation method and application thereof

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Experimental program
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Embodiment 1

[0048] A method for preparing a high-temperature composite phase-change heat storage material with a multi-core-shell structure, the specific steps are as follows:

[0049] S1. Add zinc-aluminum alloy powder to distilled water to prepare a zinc-aluminum alloy powder turbid solution, place the turbid solution in an ultrasonic disperser and perform ultrasonic treatment for 30 minutes to obtain a zinc-aluminum alloy powder suspension; the concentration of the zinc-aluminum alloy powder turbid solution is 20g / L;

[0050] S2. adding carbon nanotubes (CNTs) to absolute ethanol and then dispersing them under ultrasonic conditions for 1 hour to obtain a suspension of carbon nanotubes (CNTs);

[0051] S3. Mix the zinc-aluminum alloy powder suspension in S1 and the carbon nanotube (CNTs) suspension in S2 at a mass ratio of 1:4, put them in an autoclave at 120°C for hydrothermal reaction for 12 hours, and cool to room temperature, filter, wash the solid with distilled water and absolute...

Embodiment 2

[0061] A method for preparing a high-temperature composite phase-change heat storage material with a multi-core-shell structure, the specific steps are as follows:

[0062] S1. Add zinc-aluminum alloy powder to distilled water to prepare a zinc-aluminum alloy powder turbid solution, place the turbid solution in an ultrasonic disperser and perform ultrasonic treatment for 40 minutes to obtain a zinc-aluminum alloy powder suspension; the concentration of the zinc-aluminum alloy powder turbid solution is 30g / L;

[0063] S2. adding carbon nanotubes (CNTs) to absolute ethanol and then dispersing them under ultrasonic conditions for 2 hours to obtain a suspension of carbon nanotubes (CNTs);

[0064] S3. Mix the zinc-aluminum alloy powder suspension in S1 and the carbon nanotube (CNTs) suspension in S2 at a mass ratio of 1:5, put them in an autoclave at 130°C for hydrothermal reaction for 16 hours, and cool to room temperature, filter, wash the solid with distilled water and absolut...

Embodiment 3

[0073] A method for preparing a high-temperature composite phase-change heat storage material with a multi-core-shell structure, the specific steps are as follows:

[0074] S1. Add zinc-aluminum alloy powder to distilled water to prepare a zinc-aluminum alloy powder turbid solution, place the turbid solution in an ultrasonic disperser and perform ultrasonic treatment for 50 minutes to obtain a zinc-aluminum alloy powder suspension; the concentration of the zinc-aluminum alloy powder turbid solution is 40g / L;

[0075] S2. adding carbon nanotubes (CNTs) to absolute ethanol and then dispersing them under ultrasonic conditions for 2.5 hours to obtain a suspension of carbon nanotubes (CNTs);

[0076] S3. Mix the zinc-aluminum alloy powder suspension in S1 and the carbon nanotube (CNTs) suspension in S2 at a mass ratio of 1:6, put them in a high-pressure reactor at a temperature of 140°C for hydrothermal reaction for 20 hours, and cool to room temperature, filter, wash the solid wi...

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Abstract

The invention discloses a high-temperature composite phase-change heat storage material with a multi-core-shell structure, and a preparation method and application thereof, belonging to the technicalfield of heat storage materials. According to the invention, zinc-aluminum alloy powder Zn-Al serves as an inner core, carbon nanotubes CNTs serve as a first shell layer, and the zinc-aluminum alloy powder Zn-Al wrapped by the carbon nanotubes CNTs is synthesized through a hydrothermal method and has a structure of Zn-Al@CNTs; then, the Zn-Al@CNTs are added into a tetraethoxysilane-lanthanum saltmixed solution through a coprecipitation method, reaction is performed under the condition of adjusting the pH value of the solution, and then roasting is carried out; and after packaging, casting molding and normal-temperature hardening, the heat storage material with La2O3-SiO2 as a second shell layer is formed, and the structure of the heat storage material is La2O3-SiO2-(Zn-Al@CNTs). The heatstorage material can effectively and reasonably store excess heat in the pyrolysis and gasification process of garbage, and meets the requirement for heat needed by subsequent pollutant removal aftergarbage pyrolysis and gasification.

Description

technical field [0001] The invention relates to the technical field of heat storage materials, in particular to a high-temperature composite phase-change heat storage material suitable for pyrolysis and gasification of garbage. Background technique [0002] With the rapid development of my country's economy, the output of municipal solid waste has also maintained a rapid growth trend, and people's attention to environmental protection issues has also continued to rise. At present, the treatment of domestic waste is mainly based on high-temperature pyrolysis and gasification. The pyrolysis and gasification of waste means that the waste is burned under the condition of anaerobic or anoxic, and the macromolecules of the organic components in the waste are broken, producing Process of small molecule gases, tars and residues. Garbage pyrolysis gasification technology not only realizes the harmlessness, reduction and recycling of garbage, but also effectively overcomes the proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 马军祥王伟林付鹏兵张敏张华伟王娟梁鹏
Owner SHANXI LUAN MINING GRP
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