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Hydroxide heat storage material

A heat storage material and hydroxide technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of low dehydration rate and hinder hydration reaction, and achieve good thermal stability and high heat storage and release rate. , The effect of using a wide temperature range

Inactive Publication Date: 2019-12-31
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low dehydration rate, the calcium hydroxide generated during the water absorption process hinders the hydration reaction, so it is necessary to modify the material to increase the reaction rate and conversion rate

Method used

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  • Hydroxide heat storage material

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Experimental program
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Effect test

Embodiment 1

[0063] The invention provides a heat storage material, comprising the following components in mass percentage: calcium hydroxide (70%), potassium hydroxide (10%), graphite (20%); the conversion temperature is 320 degrees, and the conversion reaction heat is 1010J / g. After 10 heat storage and release cycles, the heat of reaction was 995 J / g. The heat storage rate is increased by about 16 times.

Embodiment 2

[0065] The invention provides a heat storage material, comprising the following components in mass percentage: calcium hydroxide (75%), sodium hydroxide (20%), graphite (5%); the conversion temperature is 330 degrees, and the conversion reaction heat is 1050J / g. After 10 heat storage and release cycles, the heat of reaction was 998 J / g. The heat storage rate is increased by about 16 times.

Embodiment 3

[0067] The invention provides a heat storage material, comprising the following components in mass percentage: calcium hydroxide (75%), sodium hydroxide hydrate (20%), graphene (5%); conversion temperature 330 degrees, conversion reaction heat It is 1180J / g. After 10 heat storage and release cycles, the heat of reaction was 1070 J / g. The heat storage rate is increased by about 11 times.

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Abstract

The invention relates to cross-season heat storage technology, and belongs to the field of green energy. According to the technology, magnesium hydroxide or calcium hydroxide dehydration reaction is used for storing heat. A disclosed heat storage material comprises the following components: at least one magnesium or calcium compound selected from hydroxides and oxides; at least a compound of another metal; at least one kind of carbon and metal which are selected from graphite, graphene, carbon tubes, silicon carbide, stainless steel and nickel; and at least one compound of a metal salt. The heat storage material provided by the invention is high in stability, high in heat storage density, free of loss in long-term heat storage, high in heat storage rate and excellent in heat storage and release performance; the material is simple in preparation process, convenient to produce, safe, reliable, capable of achieving standardization of material preparation, suitable for large-scale industrial production and free of emission of three wastes.

Description

technical field [0001] The invention belongs to the technical field of new energy and energy storage, and specifically relates to a long-term high-efficiency heat storage material. Background technique [0002] Heat storage is an effective means to solve the time and place contradictions of energy supply and demand; heat storage can improve energy utilization, reduce energy waste, and provide green energy for the society. Energy and environmental issues are two major issues that are generally concerned in the world today. In order to protect the environment and achieve sustainable economic development and reduce pollutant emissions, it is particularly important to vigorously develop green energy technologies. Among many green energies, wind energy and solar energy are the clean energy with the widest distribution and the largest total resources on the earth. However, the thermal utilization of solar energy is unstable in time and space, which brings great difficulties to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C09K5/14
CPCC09K5/063C09K5/14
Inventor 武钦佩孙璐李亚婷
Owner BEIJING INSTITUTE OF TECHNOLOGYGY