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 slow dehydration kinetics and restrictions on the large-scale application of materials

Inactive Publication Date: 2015-07-08
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its dehydration kinetics speed is too slow, which seriously restricts the large-scale application of this material. The development of composite materials is the main means to improve its dehydration kinetics performance. Among them, reducing the temperature of thermal decomposition reaction and improving the internal mass and heat transfer performance of composite materials are the key factors. The key to improving 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 330 K, add 74 mg of calcium hydroxide, stir to make it fully dissolved, add 81 mg of zinc oxide to the calcium hydroxide solution, and continue to react for 12 h under constant stirring to obtain milky white suspension. Cylindrical honeycomb-shaped expanded graphite with a mass of 200 mg, a radius of 2.5 cm and a length of 5 cm was added to the suspension, ultrasonically vibrated at a temperature of 330 K for 24 h, and after standing at a temperature of 293 K for about 12 h, Dry at a temperature of 373 K, take out the expanded graphite and rinse it for 1-2 times, and then dry it in an oven at 323 K for 5 h to make expanded graphite-based CaZn 1.03 (OH) 4.06 2H 2 O / C composite solar chemical heat storage material. Microscopic analysis shows that the material has an amorphous crystal structure and can realize nanoscale composites. Its average dehydration decomposition temperature under normal pressure is about 35...

Embodiment 2

[0024] Add 1000 mL of distilled water to the beaker and heat to 330 K, then weigh 74 mg of calcium hydroxide and add it to the beaker, and stir to make it fully dissolve; 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 a cylindrical honeycomb-shaped expanded graphite with a mass of 200 mg, a radius of 2.5 cm and a length of 5 cm in a beaker, and ultrasonically vibrate at a temperature of 330 K for 24 h; Then the solution was left to stand at a temperature of 293 K for about 12 h, and then the beaker was dried at a temperature of 373 K, and the expanded graphite was taken out and the surface was cleaned. Finally rinsed 1-2 times, and then placed in a 323 k oven to dry for 5 h to make expanded graphite-based CaZn 1.92 (OH) 5.84 2H 2 O / C composite solar energy chemical heat storage material, microscopic analysis shows that the material has an amorphous c...

Embodiment 3

[0026] Add 1000 mL of distilled water to the beaker and heat it to 330K, then 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, continuously Stir and react continuously for 12 h to obtain a milky white suspension; place powdered expanded graphite with a mass of 200 mg in a beaker, and ultrasonically vibrate for 24 h at a temperature of 330 K; then stand the solution at a temperature of 293 K After about 12 h, the beaker was dried at a temperature of 373 K, the expanded graphite was taken out and the surface was cleaned. Finally rinsed 1-2 times, and then placed in a 323 k oven to dry for 5 h to make expanded graphite-based CaNi 2.12 (OH) 4.24 2H 2 O / C composite solar energy chemical heat storage material, microscopic analysis shows that the material has an amorphous crystal structure and can realize nanoscale composite. Its average dehydration de...

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Abstract

The invention discloses an expanded graphite composite material, namely CaxMy(OH)2(x+y).2H2O / C, and a preparation method thereof, wherein M is Co, Ni or Zn, x / y is 0.25-4, C represents expanded graphite, and the weight ratio of CaxMy(OH)2(x+y).2H2O to C is 0.25-0.5. According to the expanded graphite composite material disclosed by the invention, calcium hydroxide and a transition metal oxide are prepared into a nano-composite material and stored in a porous expanded graphite substrate, particles can be prevented from being re-gathered together during heat absorption and heat release reactions, and the existence of the porous expanded graphite substrate can effectively improve the heat transfer performance of steam and reduce the influence of expansion and shrinkage of a solid phase during the reaction processes on reactions.

Description

technical field [0001] The invention relates to an expanded graphite composite material Ca x m y (OH) 2(x+y) 2H 2 O / C and its preparation method and application. 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, its dehydration kinetics speed is too slow, which seriously restricts the large-scale application of this material. The development of composite materials is the main means to improve its dehydration kinetics performance. Among them, reducing the temperature of thermal decomposition reaction and improving the inter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/16
Inventor 胡军郑茂盛余历军赵源滕海鹏
Owner NORTHWEST UNIV
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