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Metal hydride heat-storage medium and preparation method thereof

A heat storage medium, hydride technology, applied in chemical instruments and methods, heat exchange materials, etc., to achieve the effects of fast storage, improved thermal conductivity, and adjustable release rate

Inactive Publication Date: 2019-05-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are still relatively few studies on how to ensure that the heat storage material block has a high volume ratio heat storage density, improve its thermal conductivity and ensure that the material can be recycled efficiently.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Using commercially available magnesium metal powder as a raw material, the magnesium metal powder has a particle size of 150 microns and a purity of 99.5%. Magnesium metal powder is subjected to hydrogenation treatment at 400°C for 12 hours under a 100bar high-purity hydrogen atmosphere to obtain powdered magnesium hydride (MgH 2 ) material, the purity of the high-purity hydrogen is greater than 99.99%. The obtained magnesium hydride material is prone to oxidation and failure, and the subsequent operation and storage must be carried out in a high-purity argon protective atmosphere. The water content in the high-purity argon protective atmosphere is <1ppm, and the oxygen content is <1ppm.

[0046] (2) Titanium hydride (TiH) is synthesized by reacting 99% pure titanium (Ti) with high-purity hydrogen (pressure 3MPa) at a temperature of 600°C. 2 ), the purity of high-purity hydrogen for synthesis is greater than 99.99%. The obtained titanium hydride catalyst has a ti...

Embodiment 2

[0052] (1) Magnesium-nickel alloy (Mg 2 Ni) ingots, the alloy blocks obtained by smelting are mechanically broken into small pieces of 1mm-1cm, and the subsequent operation and storage of the obtained magnesium-based alloy powder materials must be carried out in a high-purity argon protective atmosphere. The water content in the high-purity argon protective atmosphere is <1ppm, and the oxygen content is <1ppm.

[0053] (2) React an alloy containing 70% metal titanium (Ti) and 30% metal vanadium (V) with high-purity hydrogen (pressure 2 MPa) at a temperature of 500 ° C to synthesize titanium vanadium hydride (Ti-V-H), which is used for synthesis The purity of high-purity hydrogen is greater than 99.99%. The obtained titanium vanadium hydride (Ti-V-H) catalyst has a titanium vanadium content greater than 95 percent and a hydrogen content of 1-3 percent.

[0054] (3) the magnesium-nickel alloy (Mg) obtained in step (1) 2 Ni), adding the titanium vanadium hydride (Ti-V-H) catal...

Embodiment 3

[0059] (1) Magnesium-nickel alloy (Mg 2 Fe) ingots, the alloy blocks obtained by smelting are mechanically broken into small pieces of 1mm-1cm, and the subsequent operation and storage of the obtained magnesium-based alloy powder materials must be carried out in a high-purity argon protective atmosphere. The water content in the high-purity argon protective atmosphere is <1ppm, and the oxygen content is <1ppm.

[0060] (2) React an alloy containing 50% metal titanium (Ti) and 50% metal vanadium (V) with high-purity hydrogen (pressure 2 MPa) at a temperature of 550°C to synthesize titanium vanadium hydride (Ti-V-H), which is used for synthesis The purity of high-purity hydrogen is greater than 99.99%. The obtained titanium vanadium hydride (Ti-V-H) catalyst has a titanium vanadium content greater than 95 percent and a hydrogen content of 1-3 percent.

[0061] (3) The iron alloy (Mg 2 Fe), adding the titanium vanadium hydride (Ti-V-H) catalyst prepared in step (2), the amount...

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Abstract

The invention relates to a metal hydride heat-storage medium and a preparation method thereof. Through optimization, the heat-storage medium provided by the invention comprises the following components by mass: 50 to 90% of magnesium; 0 to 40% of M1, which is at least one selected from the group consisting of iron, nickel and cobalt elements; 1 to 5% of M2, which is at least one selected from thegroup consisting of titanium, vanadium and niobium elements; and 3 to 20% of carbon. The heat-storage medium has an energy storage density of 1000 to 3000 MJ / m3, a thermal conductivity of 3 to 10 W / m.K and a compactness of 50 to 70%. The preparation method for the heat-storage medium comprises the following steps: preparing magnesium-based hydride in a high-pressure hydrogen atmosphere; then subjecting metal M2 containing a catalytic element to hydrogenation treatment so as to obtain a catalyst; uniformly mixing the catalyst with the magnesium-based hydride, and crushing an obtained mixture toa nanometer grade; and adding a carbon-based heat transfer agent, carrying out uniform mixing, and carrying out press molding so as to obtain a finished product with a compactness of 50 to 70%. The preparation method provided by the invention is reasonable in component design; and the metal hydride heat-storage medium prepared by using the preparation method provided by the invention has the advantages of large heat-storage density, high heat-absorbing rate, controllable heat-releasing rate, excellent cycle performance and long service life.

Description

technical field [0001] The invention relates to a metal hydride heat storage medium and a preparation method thereof, in particular to a metal hydride heat storage medium and a preparation method of the heat storage medium. Background technique [0002] With the world's increasingly scarce fossil energy and concerns about global climate change, the development and utilization of new energy and energy-saving and emission-reduction technologies have become the most important direction in the energy field. In the process of energy use and conversion, a large amount of energy is consumed and lost in the form of heat energy. Therefore, storing, transforming and utilizing thermal energy in a suitable way can generate huge benefits. In recent years, regenerative heating technology has received widespread attention and has been widely used in industrial production, playing an important role in energy saving and emission reduction. For example, in iron and steel production enterpri...

Claims

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Application Information

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IPC IPC(8): C09K5/16
Inventor 周承商刘咏刘彬吴宏谭彦妮张伟
Owner CENT SOUTH UNIV
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