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Expanded graphite composite heat storage material and its preparation method and application

A technology of expanded graphite and composite materials, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of dehydration kinetics speed restricting large-scale application, etc.

Inactive Publication Date: 2016-03-02
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the slow dehydration kinetics seriously restricts the large-scale application of this material. The development of composite materials is the main means to improve its dehydration kinetics. Among them, reducing the temperature of thermal decomposition reaction and improving the internal mass and heat transfer performance of composite materials are the key to improving the dehydration kinetics. key to its dehydration kinetics

Method used

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  • Expanded graphite composite heat storage material and its preparation method and application
  • Expanded graphite composite heat storage material and its preparation method and application
  • Expanded graphite composite heat storage material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add 1000mL of distilled water to the beaker and heat to 293K, then add enough ammonium chloride into the beaker, stir well, filter to obtain a saturated ammonium chloride solution, weigh 144mg of calcium hydroxide and add it to the beaker, stir to make it fully Dissolve; weigh 162mg of zinc oxide and add it to the calcium hydroxide solution, stir continuously, and react continuously for 12 hours to obtain a milky white suspension; add 200mg of powdered expanded graphite to the beaker, and ultrasonically vibrate for 24 hours at a temperature of 293K; then After the solution was left to stand for about 12 hours at a temperature of 293K, the beaker was placed at a temperature of 353K for about 10 hours to discharge ammonia and water, and after drying, the expanded graphite was taken out and washed with distilled water, heated to 353K, dried for 10 hours, and washed with circulating water and drying repeated 2-3 times to obtain the final expanded graphite-based calcium-based...

Embodiment 2

[0024] Add 1000mL of distilled water to the beaker and heat to 293K, then add enough ammonium chloride to the beaker, stir well, filter to obtain a saturated ammonium chloride solution, weigh 74mg of calcium hydroxide and add it to the beaker, and stir to make It is fully dissolved; weigh 162mg of zinc oxide and add it to the prepared calcium hydroxide solution, stir continuously, and react continuously for 12 hours to obtain a milky white suspension; place 200mg of powdered expanded graphite in a beaker and vibrate ultrasonically at a temperature of 293K 24h; then put the solution at a temperature of 293K for about 12h, place the beaker at a temperature of 353K for about 10h to discharge ammonia and water, take out the expanded graphite after drying and clean the surface; the taken out expanded graphite Cool to room temperature and wash with distilled water; heat the sample to a temperature of 353K for about 10h to dry the sample. The final expanded graphite-based Ca x Zn y...

Embodiment 3

[0026] Add 1000mL of distilled water to the beaker and heat to 293K, then add enough ammonium chloride to the beaker, stir well, filter to obtain a saturated ammonium chloride solution, weigh 74mg of calcium hydroxide and add it to the beaker, and stir to make It is fully dissolved; weigh 150 mg of nickel oxide and add it to the prepared calcium hydroxide solution, stir continuously, and react continuously for 12 hours to obtain a milky white suspension; place powdered expanded graphite in a beaker, and ultrasonically vibrate at a temperature of 293K for 24 hours Then the solution was left to stand at a temperature of 293K for about 12h, and the beaker was placed at a temperature of 353K for about 10h to exhaust ammonia and water, and after drying, the expanded graphite was taken out and the surface was cleaned; the expanded graphite taken out was cooled to room temperature, and washed with distilled water; the sample was heated to a temperature of 353K for about 10h, and the s...

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Abstract

The invention discloses an expanded graphite composite heat storage material and a preparation method thereof. Its molecular formula is CaxMy(OH)[2(x+y)-z]Clz·2H2O / C, where M is Co, Ni or Zn, x / y is 0.25~2, C represents graphite, and the weight ratio of CaxMy(OH)[2(x+y)-z]Clz·2H2O to C is 0.25~0.5. In the present invention, calcium hydroxide and transition metal oxides are made into nanocomposite materials and stored in a porous expanded graphite matrix to prevent these particles from polymerizing together again in the endothermic and exothermic reaction. The presence of the porous expanded graphite matrix can effectively Improve the heat transfer performance of steam and reduce the impact of solid phase expansion and contraction on the reaction during the reaction.

Description

technical field [0001] The invention relates to an expanded graphite composite heat storage material and a preparation method thereof. Background technique [0002] At present, chemical heat storage is an efficient heat storage technology with very good development prospects, and its energy storage density is an order of magnitude larger than that of phase change heat storage. Calcium hydroxide chemical heat storage material has the characteristics of good stability, high energy storage density, good cycle performance, and appropriate porosity. It is a very good solar energy chemical reaction heat storage method. However, the slow dehydration kinetics seriously restricts the large-scale application of this material. The development of composite materials is the main means to improve its dehydration kinetics. Among them, reducing the temperature of thermal decomposition reaction and improving the internal mass and heat transfer performance of composite materials are the key t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/18
Inventor 郑茂盛胡军余历军赵源滕海鹏
Owner NORTHWEST UNIV
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