A kind of preparation method of hierarchical porous heterogeneous composite phase change material

A technology of composite phase change material and phase change core material, which is applied in the field of preparation of stepped porous heterogeneous composite phase change material, can solve problems such as leakage of liquid molten salt, and achieve the improvement of thermal energy use efficiency, thermal conductivity, high phase change, etc. The effect of latent heat

Inactive Publication Date: 2016-08-10
UNIV OF SCI & TECH BEIJING
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  • Summary
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Problems solved by technology

[0005] The purpose of the present invention is to propose a cascaded porous heterogeneous composite phase change material suitable for the effective recovery of intermittent waste heat in the process industry or the development of clean energy such as solar energy. This material is suitable for high temperature fields. Compared with pure molten salt, On the one hand, it solves the leakage problem of liquid molten salt in the actual application process, slows down the corrosion effect of the phase change material itself on the container, and at the same time can improve the thermal conductivity and better heat transfer performance, thus effectively improving the efficiency of heat energy utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The high-purity expandable graphite is placed in a muffle furnace at 850 ℃ ~ 950 ℃ and heated rapidly for about 60 seconds to prepare expanded graphite. Mix 10 g deionized water with 8 g LiNO 3 Mix and stir in a magnetic stirrer at 30 °C for 2 hours at a rate of 300 rpm to obtain a homogeneous solution with a solute content of 44.44%. Add expanded graphite and stir magnetically at a rate of 300 rpm for 2 hours, remove excess solution by filtration and move it to a blast dryer, set the temperature at 110°C, and evaporate excess water for 20 hours. The obtained product was placed in a muffle furnace, calcined at 304 °C for 2 hours, and cooled slowly. The melting point of the porous heterogeneous composite phase change material obtained above was measured by differential scanning calorimetry to be 251.9 °C, and the latent heat value was 150.0 J g -1 . Its thermal conductivity is 46.2 W / m·K. The particle size of the high-purity expandable graphite used is above 100 mesh...

Embodiment 2

[0041] The high-purity expandable graphite is placed in a muffle furnace at 850 ℃ to 950 ℃ and heated for about 90 seconds to prepare expanded graphite. Mix 25 g deionized water with 15 g NaNO 3 Mix and stir in a magnetic stirrer at 25 °C for 2 hours at a rate of 250 rpm to obtain a homogeneous solution with a solute content of 37.5%. Add expanded graphite at room temperature and fully soak for 5 hours, filter to remove excess solution, then move it to a blast dryer, set the temperature at 120°C, and evaporate excess water for 12 hours. Then the product was transferred into a muffle furnace, calcined at 360 °C for 2 hours, and cooled slowly. The melting point of the porous heterogeneous composite phase change material obtained above was measured by differential scanning calorimetry to be 303.2 ℃, and the latent heat value was 117.2 J g -1 . Its thermal conductivity is 20.5 W / m·K. The particle size of the high-purity expandable graphite used is above 100 mesh, the expansion...

Embodiment 3

[0043] Dissolve 4.0 g of P123 in 100 ml of deionized water, add 20 ml of 37% hydrochloric acid, mix uniformly at 35 °C, add 8.5 g of tetraethyl orthosilicate as a silicon source, and stir magnetically for 24 hours. The reaction mixture was transferred to a reaction kettle and reacted at 110 °C for 24 hours. The reaction mixture was taken out, filtered to obtain a solid, and placed in a muffle furnace for calcination at 550 °C for 5 hours to remove the template agent P123 and prepare the mesoporous molecular sieve SBA-15. Mix 10.0 g deionized water with 15.93 g Li 2 CrO 4 • 2H 2 O was mixed and stirred in a magnetic stirrer at a rate of 350 rpm for 4 hours at 30 °C to obtain a homogeneous solution with a solute content of 61.40%. Add SBA-15 to the above solution and stir it magnetically at a rate of 300 rpm for 3 hours, filter to remove excess solution, then move it to a blower dryer, set the temperature at 130 °C, evaporate excess water, and the evaporation time is 10 hours...

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Abstract

The invention discloses thinking for preparing a series of porous heterogeneous composite phase-change materials of which the temperature changes in a gradient manner. Porous materials (such as expanded graphite, mesoporous molecular sieve, diatomite and the like) which is high-temperature resisting, high in stability and large in specific surface area are used as phase-change base materials, different inorganic fused salt phase-change materials are used as core materials, and a series of porous heterogeneous composite phase-change materials are prepared by using a steeping method; the phase-change temperature of the material has the gradient characteristic, and the potential heat value is more than 100J.g<-1> with slight difference. The porous high-temperature composite phase-change material can be used for both effectively immobilizing a phase-change core material, preventing leakage, saving packaging investment in later period, and increasing the heat conduction of the material and improving the phase-change heat conduction efficiency. The series of porous heterogeneous composite phase-change materials are applicable to working temperature region process with non-stability characteristic, difference and large span, and have significance in effectively recycling industrial intermittent waste heat.

Description

technical field [0001] The invention belongs to the field of composite phase change materials, and in particular relates to a preparation method of hierarchical porous heterogeneous composite phase change materials applicable to different temperatures. Background technique [0002] Energy storage is an important branch of energy science and technology. At present, mankind is facing an energy crisis. Traditional fossil energy is limited and cannot meet the needs of future human development. The use of fossil energy will also cause serious environmental pollution, and the large amount of greenhouse gases emitted will worsen the climate. To this end, humans have developed clean energy sources such as solar energy, wind energy, and ocean energy. However, most of these energies are natural energies, lack of human controllability, and have the characteristics of dispersion, intermittency, and volatility, so the use efficiency is low, and they are not suitable for large-scale ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCY02P20/141
Inventor 王戈钟丽敏张晓伟杨穆栾奕
Owner UNIV OF SCI & TECH BEIJING
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