High-performance carbon/carbonate heat transfer and storage medium, phase change heat storage composite material and preparation method of high-performance carbon/carbonate heat transfer and storage medium

A heat storage medium, phase change heat storage technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of phase separation, uneven dispersion, etc., to reduce the degree of phase separation, uniform dispersion, and easy access to raw materials Effect

Pending Publication Date: 2022-04-26
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the dispersion of conventional carbon nanomaterials in molten carbonate is not uniform, and carbon nanotubes and graphite powder will undergo obvious phase separation when added to molten carbonate.

Method used

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  • High-performance carbon/carbonate heat transfer and storage medium, phase change heat storage composite material and preparation method of high-performance carbon/carbonate heat transfer and storage medium
  • High-performance carbon/carbonate heat transfer and storage medium, phase change heat storage composite material and preparation method of high-performance carbon/carbonate heat transfer and storage medium
  • High-performance carbon/carbonate heat transfer and storage medium, phase change heat storage composite material and preparation method of high-performance carbon/carbonate heat transfer and storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of carbon / carbonate heat transfer heat storage medium, the steps are as follows:

[0042] (1) Preparation of molten salt electrochemical preparation of cathode salt-carbon mixture: aeration of carbon dioxide into the molten carbonate electrolyte, while inserting the cathode and anode electrodes, electrified electrolysis to obtain the cathode salt-carbon mixture;

[0043] (2) Grinding the cathode salt-carbon mixture into powder, heating and melting;

[0044] (3) Pass an inert gas into the molten carbonate for protection, then add the molten cathode salt-carbon mixture in step (2), and continue to ventilate until a uniform carbon / carbonate heat transfer and heat storage medium is formed.

[0045] In this example, at 450°C, with 50mA·cm -2 The cathode salt-carbon mixture was prepared by electrolysis, wherein the mass fraction of the electrolytic carbon material was 2.25%. Accurately weigh 2.22 g of the cathode salt-carbon mixed product prepared under this con...

Embodiment 2

[0049] Prepare carbon / carbonate heat transfer heat storage medium, method is the same as embodiment 1, specifically as follows:

[0050] At 450°C, at 50mA·cm -2 The cathode salt-carbon mixture was prepared by electrolysis, wherein the mass fraction of the electrolytic carbon material was 2.25%. Accurately weigh 4.44g of the cathode salt-carbon mixed product prepared under this condition, and in 100mL min -1 Ar flowed down, uniformly dispersed in 95.56g of molten ternary carbonate, and continued to mix for 60min to obtain a carbon material mass fraction of 0.10% uniformly dispersed carbon / carbonate heat transfer and heat storage medium.

[0051] Specific heat capacity and conductivity test:

[0052] Measure the specific heat capacity of the product of this example at 450°C, 475°C and 500°C to be 2.36J·g respectively -1 ·K -1 , 2.20J·g -1 ·K -1 and 2.01J g -1 ·K -1 , with an average value of 2.19J g -1 ·K -1 , an increase of 31.14% compared with pure molten carbonate; ...

Embodiment 3

[0054] Prepare carbon / carbonate heat transfer heat storage medium, method is the same as embodiment 1, specifically as follows:

[0055] At 450°C, at 50mA·cm -2 The cathode salt-carbon mixture was prepared by electrolysis, wherein the mass fraction of the electrolytic carbon material was 2.25%. Accurately weigh 6.67g of the cathode salt-carbon mixed product prepared under this condition, and in 100mL min -1 Ar flowed down, uniformly dispersed in 93.33g of molten ternary carbonate, and continued to mix for 60min to obtain a uniformly dispersed carbon / carbonate heat transfer and heat storage medium with a carbon material mass fraction of 0.15%.

[0056] Specific heat capacity and conductivity test:

[0057] Measure the specific heat capacity of the product of this example at 450°C, 475°C and 500°C to be 2.25J·g respectively -1 ·K -1 , 2.12J·g -1 ·K -1 and 2.08J g -1 ·K -1 , with an average value of 2.15J g -1 ·K -1 , an increase of 28.74% compared with pure molten carb...

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Abstract

The invention provides a high-performance carbon / carbonate heat transfer and storage medium and a preparation method thereof. The preparation method comprises the following steps: adding a high-dispersity carbon material into a carbonate system, wherein the high-dispersity carbon material is obtained by electrochemical conversion of CO2; the carbon material is dispersed into a molten carbonate system to be compounded to form a uniform heat transfer and storage medium. The invention further provides the carbon / carbonate phase change heat storage composite material and a preparation method thereof. According to the preparation method, mixed carbonate of lithium carbonate, sodium carbonate and potassium carbonate is used as a molten salt system, a carbon material with high wettability with molten carbonate is added, and the carbon material is obtained through CO2 electrochemical conversion; the carbon material is added into a molten carbonate system to be compounded to form the phase change heat storage composite material. The prepared heat transfer and storage medium material is uniform, has ultrahigh specific heat capacity and heat conductivity, and is suitable for being used as a heat transfer and storage fluid for solar photo-thermal power generation. The prepared phase change heat storage composite material is uniform, and has high heat conductivity and cycling stability.

Description

technical field [0001] The invention belongs to the technical field of thermal energy storage and transfer, and specifically relates to a heat transfer and heat storage composite medium, in particular to a high-performance carbon / carbonate heat transfer and heat storage medium, a phase change heat storage composite material and a preparation method thereof. Background technique [0002] In a solar thermal power station, the energy conversion efficiency of the heat engine must reach 50%, and the stable upper limit temperature of the heat transfer and heat storage medium needs to be above 850°C. Molten carbonate with high upper limit working temperature, weak corrosion, low saturated vapor pressure and low cost is an ideal molten salt system that meets this series of requirements. [0003] However, molten carbonates have low thermal conductivity and specific heat capacity, which limit their energy efficiency in endothermic-exothermic cycles. The application number is 20131073...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 汪的华窦砚鹏杜开发尹华意
Owner WUHAN UNIV
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