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Expanded graphite composite heat storage material as well as preparation method and application thereof

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: 2013-09-11
NORTHWEST UNIV(CN)
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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 as well as preparation method and application thereof
  • Expanded graphite composite heat storage material as well as preparation method and application thereof
  • Expanded graphite composite heat storage material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 1000 mL of distilled water to the beaker and heat to 293 K, then add a sufficient amount of ammonium chloride into the beaker, stir well, filter to obtain a saturated ammonium chloride solution, weigh 144 mg of calcium hydroxide and add it to the beaker, stir Make it fully dissolved; weigh 162 mg of zinc oxide and add it to the calcium hydroxide solution, stir continuously, and react continuously for 12 h to obtain a milky white suspension; add 200 mg of powdered expanded graphite to the beaker, Ultrasonic vibration for 24 h; then the solution was left to stand at a temperature of 293 K for about 12 h, and the beaker was placed at a temperature of 353 K for about 10 h to exhaust ammonia and water. After drying, the expanded graphite was taken out and washed with distilled water. Heating to a temperature of 353 K and drying for 10 h, cyclic washing and drying repeated 2-3 times to obtain the final expanded graphite-based calcium-based nanocomposite solar heat storage ...

Embodiment 2

[0024] Add 1000 mL of distilled water to the beaker and heat to 293 K, then add a sufficient amount of ammonium chloride to the beaker, stir well, filter to obtain a saturated ammonium chloride solution, weigh 74 mg of calcium hydroxide and add it to the beaker, And stir to make it fully dissolved; weigh 162 mg of zinc oxide and add it to the prepared calcium hydroxide solution, stir continuously, and react continuously for 12 h to obtain a milky white suspension; place 200 mg of powdered expanded graphite in a beaker, Ultrasonic vibration at a temperature of K for 24 h; then the solution was left to stand at a temperature of 293 K for about 12 h, and the beaker was placed at a temperature of 353 K for about 10 h to exhaust ammonia and water, and the expanded graphite was taken out after drying And the surface was cleaned; the expanded graphite was cooled to room temperature and washed with distilled water; the sample was heated to a temperature of 353 K for about 10 h to dry t...

Embodiment 3

[0026] Add 1000 mL of distilled water to the beaker and heat to 293 K, then add a sufficient amount of ammonium chloride to the beaker, stir well, filter to obtain a saturated ammonium chloride solution, weigh 74 mg of calcium hydroxide and add it to the beaker, And stir to make it fully dissolved; weigh 150 mg of nickel oxide and add it to the prepared calcium hydroxide solution, stir continuously, and react continuously for 12 h to obtain a milky white suspension; place the powdered expanded graphite in a beaker, and heat it at 293 K Ultrasonic vibration at a temperature of 24 h; then the solution was left to stand at a temperature of 293 K for about 12 h, and the beaker was placed at a temperature of 353 K for about 10 h to exhaust ammonia and water. After drying, the expanded graphite was taken out and Clean the surface; cool the removed expanded graphite to room temperature and wash it with distilled water; heat the sample to 353 K for about 10 h to dry the sample. The fi...

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Abstract

The invention discloses an expanded graphite composite heat storage material and a preparation method thereof. The expanded graphite composite heat storage material has a molecular formula of CaxMy(OH)[2(x+y)-z]Clz.2H2O / C, wherein M is Co, Ni or Zn, x / y is 0.25-2, C represents graphite, and the weight ratio of the CaxMy(OH)[2(x+y)-z]Clz.2H2O / C to C is 0.25-0.5. According to the expanded graphite composite heat storage material, calcium hydroxide and a transition metal oxide are prepared into a nano composite material which is stored in a porous expanded graphite matrix to prevent microparticles from being polymerized together again in endothermic and exothermic reactions, and the porous expanded graphite matrix can effectively improve the heat transfer performance of steam and reduce the influence of expansion and contraction of a solid phase in a reaction process on 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 a highly efficient heat storage technology with very promising 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 ar...

Claims

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Application Information

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