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High temperature phase change composite heat storage material and preparation method thereof

A composite heat storage material and high-temperature phase change technology, which is applied in the field of high-temperature phase-change composite heat storage materials and its preparation, can solve the problems of inability to fully utilize the heat storage function of heat storage materials, poor thermal conductivity, and poor thermal conductivity. Large latent heat, high thermal conductivity, fast heat absorption and heat release

Inactive Publication Date: 2018-05-08
TIANJIN QIZHEN ENERGY SAVING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current heat storage materials generally have the disadvantage of poor thermal conductivity, so the phase change heat storage components made of them cannot fully exert the heat storage function of the heat storage material due to their poor thermal conductivity.
Secondly, when the heat storage material undergoes a solid-liquid phase transition, it will cause leakage problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] Furthermore, the present invention also provides a method for preparing the above-mentioned high-temperature phase-change composite heat storage material, which specifically includes the following steps:

[0026] (1) Preparation of composite inorganic salt: the composite inorganic salt is formulated according to the mass ratio of sodium carbonate, strontium carbonate and calcium carbonate at 1:0.8~1:0.7~1, heated to 700°C to be in a molten state, kept warm for 1.5h to mix evenly, and then Cool and grind until the particle size reaches 300-400 mesh to obtain a composite inorganic salt;

[0027] (2) Mix 60-80 parts of composite inorganic salt, 24-30 parts of expanded graphite and 3-8 parts of graphene, add 40-50 parts of water, stir and raise the temperature to 50-60°C, and stir for 1-1.5 hours to obtain a mixture;

[0028] (3) Vacuum freeze-drying the above mixture to obtain a high temperature phase change composite heat storage material.

[0029] Wherein, in the prepar...

Embodiment 1

[0033] A method for preparing a high-temperature phase-change composite heat storage material, the method specifically includes the following steps:

[0034] (1) Preparation of composite inorganic salt: the composite inorganic salt is formulated according to the mass ratio of sodium carbonate, strontium carbonate and calcium carbonate 1:0.8:0.7, heated to 700°C to be in a molten state, kept for 1.5 hours to make it evenly mixed, then cooled and ground to The diameter reaches 300 mesh, and the composite inorganic salt is obtained;

[0035] (2) Mix 66 parts of composite inorganic salt, 30 parts of expanded graphite and 5 parts of graphene, add 40 parts of water and stir to raise the temperature to 60° C., stir for 1 hour to obtain the mixture;

[0036] (3) Vacuum freeze-dry the above mixture at a temperature of -20° C. for 24 hours to obtain a high-temperature phase-change composite heat storage material.

[0037] Through detection and calculation, the enthalpy value of the com...

Embodiment 2

[0039] A method for preparing a high-temperature phase-change composite heat storage material, the method specifically includes the following steps:

[0040] (1) Preparation of composite inorganic salt: the composite inorganic salt is formulated according to the mass ratio of sodium carbonate, strontium carbonate and calcium carbonate at 1:1:1, heated to 700°C to be in a molten state, kept for 1.5 hours to make it evenly mixed, and then cooled and ground to particle size The diameter reaches 400 mesh, and the composite inorganic salt is obtained;

[0041] (2) Mix 70 parts of composite inorganic salt, 26 parts of expanded graphite and 8 parts of graphene, add 50 parts of water and stir to raise the temperature to 50°C, stir for 1.5h to obtain the mixture;

[0042] (3) Vacuum freeze-dry the above mixture at a temperature of -18° C. for 24 hours to obtain a high-temperature phase-change composite heat storage material.

[0043] Through detection and calculation, the enthalpy val...

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Abstract

The invention belongs to the technical field of heat storage materials, and particularly discloses a high temperature phase change composite heat storage material and a preparation method thereof. Thehigh temperature phase change composite heat storage material is prepared from, by weight, 60-80 parts of inorganic salt, 24-30 parts of expanded graphite, 8-15 parts of copper powder and 3-8 parts of graphene. The prepared composite phase change heat storage material is higher in heat conducting performance and higher in heat absorption and release speed; the maximum enthalpy value reaches up to228.7 mA cm<-2>, the thermal conductivity is 4.2 mW / mg, the material has the advantages of being large in phase change latent heat, high in high temperature stability, small in toxicity and corrosivity and the like, and the phase change heat storage material is adopted, so that the energy conversion efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of heat storage materials, and in particular relates to a high-temperature phase-change composite heat storage material and a preparation method thereof. Background technique [0002] Energy saving and environmental protection are an important topic in the field of energy utilization. Using phase change latent heat of phase change heat storage materials to store energy is a new type of energy saving technology. During the phase change process, the phase change material absorbs the heat of the surrounding environment, and releases heat to the surrounding environment when the temperature of the surrounding environment decreases, so as to achieve the purpose of controlling the temperature of the surrounding environment and saving energy. It has broad application prospects in solar energy utilization, heat energy recovery, air conditioning and refrigeration, building energy saving, aerospace and other fields. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 唐华
Owner TIANJIN QIZHEN ENERGY SAVING TECH CO LTD
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