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Preparation method of core-shell structure high-temperature phase-change heat accumulation material

A technology of high-temperature phase change and heat storage materials, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of shell material leakage, low thermal conductivity of phase change heat storage materials, long reaction preparation cycle, etc., to achieve Increase the heat exchange area, superior catalytic performance, and realize the effect of large-scale production

Active Publication Date: 2018-12-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Existing phase change thermal storage materials have relatively low thermal conductivity, long reaction and preparation cycle, and the shell material cannot withstand the phase change volume change and leaks

Method used

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  • Preparation method of core-shell structure high-temperature phase-change heat accumulation material

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: A preparation method of a high-temperature phase-change heat storage material with a core-shell structure, the specific steps are:

[0029] (1) Aluminum powder, NiCl 2 , NH 4 F is added to deionized water to prepare aluminum powder turbid liquid, NiCl 2 solution and NH 4 F solution; including aluminum powder, NiCl 2 , NH 4 The molar ratio of F is 15:1.6:2, the concentration of aluminum powder in the aluminum powder turbid solution is 1.5mol / L, NiCl 2 NiCl in solution 2 The concentration is 0.16mol / L, NH 4 NH in F solution 4 The concentration of F is 0.2mol / L;

[0030] (2) Place the aluminum powder turbid solution in step (1) in an ultrasonic wave with a power of 70W and perform ultrasonic treatment for 10 minutes to obtain an aluminum powder suspension;

[0031] (3) Add gelatin to the NiCl in step (1) 2 solution, in which gelatin and NiCl 2 The solid-to-liquid ratio g:L of the solution is 10:1, stir for 20 minutes at a temperature of 40°C, then ...

Embodiment 2

[0036] Embodiment 2: A preparation method of a high-temperature phase-change heat storage material with a core-shell structure, the specific steps are:

[0037] (1) Aluminum powder, NiCl 2 , NH 4 F is added to ultrapure water to prepare aluminum powder turbid liquid, NiCl 2 solution and NH 4 F solution; including aluminum powder, NiCl 2 , NH 4 The molar ratio of F is 5:0.5:1, the concentration of aluminum powder in the aluminum powder turbid solution is 0.5mol / L, NiCl 2 NiCl in solution 2 The concentration is 0.05mol / L, NH 4 NH in F solution 4 The concentration of F is 0.1mol / L;

[0038] (2) Place the aluminum powder turbid solution in step (1) in an ultrasonic wave with a power of 40W and perform ultrasonic treatment for 5 minutes to obtain an aluminum powder suspension;

[0039] (3) Add gelatin to the NiCl in step (1) 2 solution, in which gelatin and NiCl 2 The solid-to-liquid ratio g:L of the solution is 5:1, stir for 5 minutes at a temperature of 30°C, then add ...

Embodiment 3

[0044] Embodiment 3: A preparation method of a high-temperature phase-change heat storage material with a core-shell structure, the specific steps are:

[0045] (1) Aluminum powder, NiCl 2 , NH 4 F is added to ultrapure water to prepare aluminum powder turbid liquid, NiCl 2 solution and NH 4 F solution; including aluminum powder, NiCl 2 , NH 4 The molar ratio of F is 20:2:3, the concentration of aluminum powder in the aluminum powder turbid solution is 2mol / L, NiCl 2 NiCl in solution 2 The concentration is 0.2mol / L, NH 4 NH in F solution 4 The concentration of F is 0.3mol / L;

[0046] (2) Place the aluminum powder turbid solution in step (1) in an ultrasonic wave with a power of 80W for 30 minutes to obtain the aluminum powder suspension;

[0047] (3) Add gelatin to the NiCl in step (1) 2 solution, in which gelatin and NiCl 2 The solid-to-liquid ratio g:L of the solution is 20:1, stir for 20 minutes at a temperature of 60°C, then add the aluminum powder suspension in...

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Abstract

The invention relates to a preparation method of a core-shell structure high-temperature phase-change heat accumulation material and belongs to the technical field of heat accumulation materials. Thepreparation method comprises the following steps: adding aluminum powder into a nickel chloride solution; dropwise adding an ammonium fluoride solution and ammonia water in sequence and carrying out reaction; then carrying out high-temperature roasting to obtain the core-shell structure Al@NiO-Al2O3 high-temperature phase-change heat accumulation material. According to the core-shell structure Al@NiO-Al2O3 high-temperature phase-change heat accumulation material prepared by the invention, aluminum has good performance including relatively great melting heat, high coefficient of thermal conductivity, low evaporation pressure and the like; NiO-Al2O3 is combined with a shell so that a shell structure is dense and the thickness is increased; then the material can bear chemical corrosion of liquid-state metal with a fused state, and also can bear pressure caused by volume expansion; the material can provide relatively good mechanical strength, but also can be used for enhancing the heat-conduction performance.

Description

technical field [0001] The invention relates to a preparation method of a high-temperature phase-change thermal storage material with a core-shell structure, and belongs to the technical field of thermal storage materials. Background technique [0002] High-temperature heat storage refers to the storage and release of heat energy with heat storage materials in the range of 500-1000 °C. This technology is mostly used in solar energy, waste heat utilization, etc., to solve the problem of thermal energy supply and demand mismatch in time and space in solar power generation and industrial waste heat utilization, as well as energy instability and instability caused by factors such as regions and climates. Continuity issue. The heat storage device is conducive to power peak regulation and meets the requirements of smart grid energy storage. [0003] The thermal conductivity of the existing phase change thermal storage materials is relatively low, the reaction preparation period ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 李孔斋田孟爽王华张凌陈艳鹏
Owner KUNMING UNIV OF SCI & TECH
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