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Metal oxide heat storage material, metal oxide heat storage unit and preparation method

A technology of heat storage materials and oxides, which is applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of reduced use cost, poor circulation, and low heat storage density.

Active Publication Date: 2021-12-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the Mn2O3 / Mn3O4 system has a wide reaction temperature range and a reaction temperature lower than The advantage of 1000℃, but the heat storage density is low; CuO / Cu2O system has high heat storage density and low price, but its reaction temperature range is narrow
[0004]Based on CuO / Cu2O, Mn2O3 / Mn above 3O4Single-system high-temperature thermochemical heat storage materials have problems such as poor cycle performance and slow reaction rate in the reduction / oxidation chemical reaction, so it is urgent to develop a new type of high-temperature metal oxide Heat storage materials, increase the reduction / oxidation reaction rate, improve long-term cycle performance, and ensure that the heat storage unit can store and release heat efficiently and repeatedly, thereby significantly reducing its use cost and providing guarantee for system operation

Method used

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  • Metal oxide heat storage material, metal oxide heat storage unit and preparation method
  • Metal oxide heat storage material, metal oxide heat storage unit and preparation method
  • Metal oxide heat storage material, metal oxide heat storage unit and preparation method

Examples

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Embodiment 1

[0064] In Example 1 of the present invention, a method for preparing a metal oxide heat storage material is provided, that is, a hydrothermal method, and the raw materials prepared include copper nitrate, manganese nitrate and sodium hydroxide. The preparation method mainly comprises steps:

[0065] Provide copper nitrate and manganese nitrate with a molar ratio of 1:1 as the main raw materials, stir and dissolve them into deionized water at room temperature, add sodium hydroxide to adjust the pH to 12, and continue stirring for 30 minutes to obtain the precursor;

[0066] Pour the precursor into a polytetrafluoroethylene substrate reactor, and place the reactor in a drying oven for hydrothermal reaction at 160°C-180°C for 12 hours, wash, filter and dry, then calcinate at 800°C-900°C for 6 hours to obtain Cu 1.5 mn 1.5 o 4 Composite metal oxide heat storage materials;

[0067] In this embodiment, when preparing the main raw materials, copper nitrate and manganese nitrate ar...

Embodiment 2

[0070] In this embodiment, another method for preparing the metal oxide heat storage material is provided, that is, the sol-gel method, and the raw materials for the preparation include copper nitrate, manganese nitrate, ethylene glycol and citric acid. The preparation method mainly comprises steps:

[0071] Provide copper nitrate and manganese nitrate with a molar ratio of 1:1 as the main raw materials;

[0072] According to the molar ratio of 3:10:15, the main raw materials, ethylene glycol, and citric acid were mixed, and deionized water was added, and the composite metal oxide heat storage material Cu was prepared by the sol-gel method. 1.5 mn 1.5 o 4 ;

[0073] Specifically, when preparing the main raw materials, copper nitrate and manganese nitrate are fully mixed at a molar ratio of 1:1, so that copper and manganese elements can be uniformly doped at the molecular level for subsequent reactions.

[0074] Preparation of Cu 1.5 mn 1.5 o 4 , the composite metal oxid...

Embodiment 3

[0078] In this embodiment, if Figure 10 As shown, a preparation method of a metal oxide heat storage unit is provided, that is, an impregnation adsorption method, in which the above-mentioned composite metal oxide material Cu 1.5 mn 1.5 o 4 , using the principle of impregnation and adsorption to load on the surface of the substrate-porous inert support material, thereby making a metal oxide heat storage unit. The preparation method mainly comprises steps:

[0079] Step S1, preparation A x B 3-x o 4 Composite metal oxide heat storage material, and the obtained composite metal oxide heat storage material is ground into powder; the present invention adopts the composite metal oxide high temperature heat storage material Cu 1.5 mn 1.5 o 4 ;

[0080] Step S2: Pretreat the matrix; specifically, select a porous inert support material with high porosity and high strength and perform pretreatment; pretreatment includes steps such as ultrasonic cleaning, acid leaching, and dry...

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Abstract

The invention relates to the technical field of heat storage materials, and provides a metal oxide heat storage material with excellent cycle performance, a metal oxide heat storage unit and a preparation method. The metal oxide heat storage material is an AxB3-xO4 composite metal oxide material, wherein, the A site of the AxB3-xO4 composite metal oxide material comprises Cu, and the B site of the AxB3-xO4 composite metal oxide material comprises Mn. The metal oxide heat storage unit loaded by the metal oxide heat storage material has excellent reduction / oxidation activity and cycle performance. The material can ensure that the metal oxide heat storage unit can efficiently and circularly store and release heat for multiple times, the use cost of the material is remarkably reduced, and a guarantee is provided for system operation.

Description

technical field [0001] The invention relates to the technical field of heat storage materials, in particular to a metal oxide heat storage material with excellent cycle performance, a metal oxide heat storage unit and a preparation method. Background technique [0002] Energy storage technology is the key technical support for the sustainable and steady development and large-scale utilization of renewable energy. Heat storage is an important part of energy storage. Taking solar thermal power generation as an example, China's heat storage market will reach 30 billion yuan around 2025. [0003] Heat storage mainly includes three forms of sensible heat, latent heat and chemical heat. Chemical heat storage uses the thermal effect of reversible chemical reactions to store and release energy. According to the different reacting substances, the optional heat storage temperature range is wide. For high-temperature application technology, the reduction / oxidation reaction temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/16
CPCC09K5/16Y02E60/14
Inventor 肖刚邓佳莉倪明江岑可法
Owner ZHEJIANG UNIV