CN110776875A - Heat storage material and preparation method thereof - Google Patents
Heat storage material and preparation method thereof Download PDFInfo
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- CN110776875A CN110776875A CN201810858020.0A CN201810858020A CN110776875A CN 110776875 A CN110776875 A CN 110776875A CN 201810858020 A CN201810858020 A CN 201810858020A CN 110776875 A CN110776875 A CN 110776875A
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- heat storage
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
Abstract
The invention relates to a heat storage material and a preparation method thereof, wherein the heat storage material comprises the following components: eutectic salt, inorganic clay, nano magnesium oxide and magnesium oxide, wherein the heat storage material comprises the following components in parts by weight: 55-60 parts of eutectic salt, 10-15 parts of inorganic clay, 15-20 parts of nano magnesium oxide and 5-20 parts of magnesium oxide; the heat storage material provided by the invention has reasonable components, good stability and high working temperature, and can not cause the problems of molten salt volatilization and molten salt leakage.
Description
Technical Field
The invention relates to the field of phase change heat storage material research, in particular to a heat storage material and a preparation method thereof.
Background
The heat storage technology is characterized in that heat storage materials are used as media to store solar energy and other heat energy and release the heat energy when needed, and the potential of the heat storage technology lies in solving the problem caused by mismatch between heat energy supply and demand in time, space or intensity. The development and utilization of the heat storage technology can effectively improve the utilization level of energy, and the improvement of the heat storage technology depends on heat storage materials.
At present, the heat storage materials are mainly inorganic phase change heat storage materials and organic phase change heat storage materials. The inorganic heat storage material mainly comprises salt and salt hydrate, alkali, halide, metal and metal oxide, wherein carbonate, nitrate, chloride, fluoride and mixtures thereof belong to the phase change heat storage material. Compared with organic phase-change heat storage materials, the inorganic phase-change heat storage material has the main advantages of high latent heat, higher conductivity, no toxicity, nonflammability and lower cost.
However, the problems of molten salt volatilization and molten salt leakage easily occur in the application process of the existing inorganic phase-change heat storage material, so that the quality of the heat storage material is lost, the heat storage performance of the heat storage material is influenced, and the use durability is reduced.
Disclosure of Invention
The invention provides a control method and a control device for household appliances, and aims to provide a heat storage material which has reasonable components, good stability and high working temperature and can not cause the problems of molten salt volatilization and molten salt leakage.
The purpose of the invention is realized by adopting the following technical scheme:
the improvement of the heat storage material is that the heat storage material comprises the following components in parts by weight:
55-60 parts of eutectic salt, 10-15 parts of inorganic clay, 15-20 parts of nano magnesium oxide and 5-20 parts of magnesium oxide.
Preferably, the heat storage material comprises the following components in parts by weight:
55 parts of eutectic salt, 10 parts of inorganic clay, 15 parts of nano magnesium oxide and 20 parts of magnesium oxide.
Further, the heat storage material comprises the following components in parts by weight:
60 parts of eutectic salt, 15 parts of inorganic clay, 20 parts of nano magnesium oxide and 5 parts of magnesium oxide.
Preferably, the eutectic salt comprises industrial-grade sodium carbonate and industrial-grade potassium carbonate, and the mass ratio of the industrial-grade sodium carbonate to the industrial-grade potassium carbonate is 52: 48.
Preferably, the inorganic clay is industrial inorganic clay.
Preferably, the particle size of the nano magnesium oxide is 30 nm.
Preferably, the particle size of the magnesium oxide is 30 to 80 μm.
Preferably, the heat storage material is a heat storage material applied to solar photo-thermal, geothermal, industrial waste heat and/or low-grade waste heat.
In a method of making a heat storage material, the improvement comprising:
(1) preparing eutectic salt, powder inorganic clay and powder magnesium oxide with crystal water removed;
(2) mixing the eutectic salt with the crystal water removed and the powdery inorganic clay to obtain a mixture, and carrying out atomization treatment on the mixture;
(3) after sieving the mixture subjected to atomization treatment, laying nano magnesium oxide on the surface of the mixture;
(4) mixing the mixture laid with the nano magnesium oxide and the powdered magnesium oxide, and pressurizing to obtain a heat storage material green body;
(5) and sintering the heat storage material green body in a muffle furnace at a preset temperature to obtain the heat storage material.
Preferably, the preparation of the eutectic salt with crystal water removed comprises:
A. and (2) mixing the following components in percentage by mass: drying the aqueous solution prepared by proportioning the 48 industrial-grade sodium carbonate and the 48 industrial-grade potassium carbonate in an oven at the temperature of 80-120 ℃ to obtain eutectic salt;
B. and calcining, grinding and sieving the eutectic salt at 500 ℃ to obtain the eutectic salt with crystal water removed.
The optimization method for preparing the powdery inorganic clay comprises the following steps:
A. drying inorganic clay at 120 deg.C;
B. and grinding and sieving the dried inorganic clay to obtain the powdery inorganic clay.
Preferably, the preparation of the powdered magnesium oxide comprises the following steps:
A. drying the magnesium oxide at 120 ℃;
B. and grinding and sieving the dried magnesium oxide to obtain powder magnesium oxide.
Further, when preparing eutectic salt for removing crystal water, preparing inorganic clay powder and preparing magnesium oxide powder, the aperture of the used screen is 200 meshes in the sieving process.
Preferably, the sieving in the step (3) adopts a 15-mesh sieve;
in the pressurizing treatment of the step (4), the treatment is carried out for 30s under the pressure of 8 t;
the preset temperature in the step (5) is 800-1000 ℃.
A heat storage device, comprising:
a cylindrical container filled with the heat storage material as claimed in any one of claims 1 to 9;
the top cover of the cylindrical container comprises an inner rotating cover and an outer rotating cover which are respectively provided with a through hole in the axial direction; the outer rotating cover is provided with a heat conduction optical fiber;
and the bottom and the outer part of the side wall of the cylindrical container are sequentially provided with a vacuum heat insulation layer and a heat preservation layer from inside to outside.
Preferably, the external rotating cover is made of polystyrene foam; and a reflective layer is arranged outside the outer rotating cover.
The invention has the beneficial effects that:
according to the technical scheme provided by the invention, the high-temperature composite phase-change heat storage material prepared from eutectic salt, inorganic clay, nano magnesium oxide and the preparation method of the high-temperature composite phase-change heat storage material coated by the molten salt based on the granulation technology are provided, so that the problems of molten salt volatilization and molten salt leakage easily occurring in the application process of the phase-change heat storage material can be solved, and the use durability of the phase-change heat storage material is improved.
Drawings
FIG. 1 is a graph of the performance of a heat storage material made in example 1 of the present invention;
FIG. 2 is a graph of the performance of a heat storage material made in example 2 of the present invention;
fig. 3 is a schematic structural diagram of a solar photo-thermal conversion device in an embodiment of the invention;
the heat storage device comprises a cylindrical heat storage material container 1, an inner rotating cover 2, an outer rotating cover 3, a heat conduction optical fiber 4, a vacuum heat insulation layer 5, a heat insulation layer 6 and a light reflecting layer 7.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the heat storage material comprises the following components in parts by weight:
55 parts of eutectic salt, 10 parts of inorganic clay, 15 parts of nano magnesium oxide and 20 parts of magnesium oxide. As shown in fig. 1, the performance curve of the heat storage material prepared in this example is shown.
The preparation method of the heat storage material comprises the following steps:
(1) preparing eutectic salt, powder inorganic clay and powder magnesium oxide with crystal water removed;
(2) mixing the eutectic salt with the crystal water removed and the powdery inorganic clay to obtain a mixture, pouring the mixture into a beaker, and carrying out atomization treatment on the mixture;
(3) sieving the atomized mixture to obtain a granular mixture, and laying nano magnesium oxide on the surface of the granular mixture;
(4) mixing the mixture with the nano-magnesia and the powdered magnesia, putting the mixture and the powdered magnesia into a tabletting mold, and pressurizing the mixture by a press machine to obtain a heat storage material green body;
(5) and sintering the heat storage material green body in a muffle furnace at a preset temperature to obtain the heat storage material.
The preparation of the eutectic salt with crystal water removed comprises the following steps:
A. and (2) mixing the following components in percentage by mass: drying the aqueous solution prepared by proportioning the 48 industrial-grade sodium carbonate and the 48 industrial-grade potassium carbonate in an oven at the temperature of 80-120 ℃, and then uniformly grinding the aqueous solution to obtain eutectic salt;
B. and calcining the eutectic salt in a muffle furnace at 500 ℃, and grinding and sieving the calcined eutectic salt to obtain the eutectic salt without crystal water.
Preparing powder inorganic clay, comprising:
A. completely drying inorganic clay in an oven at 120 ℃;
B. and grinding and sieving the dried inorganic clay to obtain the powdery inorganic clay.
Preparing powder magnesium oxide, which comprises the following steps:
A. completely drying the magnesium oxide in an oven at 120 ℃;
B. and grinding and sieving the dried magnesium oxide to obtain powder magnesium oxide.
When preparing eutectic salt for removing crystal water, preparing inorganic clay powder and preparing magnesium oxide powder, the aperture of the used screen is 200 meshes in the sieving process.
The sieving in the step (3) adopts a 15-mesh sieve;
in the pressurizing treatment of the step (4), the treatment is carried out for 30s under the pressure of 8 t;
the preset temperature in the step (5) is 800-1000 ℃.
Example 2:
the heat storage material comprises the following components in parts by weight:
60 parts of eutectic salt, 15 parts of inorganic clay, 20 parts of nano magnesium oxide and 5 parts of magnesium oxide. Fig. 2 shows the performance curve of the heat storage material prepared in this example.
The preparation method of the heat storage material comprises the following steps:
(1) preparing eutectic salt, powder inorganic clay and powder magnesium oxide with crystal water removed;
(2) mixing the eutectic salt with the crystal water removed and the powdery inorganic clay to obtain a mixture, and carrying out atomization treatment on the mixture;
(3) after sieving the mixture subjected to atomization treatment, laying nano magnesium oxide on the surface of the mixture;
(4) mixing the mixture laid with the nano magnesium oxide and the powdered magnesium oxide, and pressurizing to obtain a heat storage material green body;
(5) and sintering the heat storage material green body in a muffle furnace at a preset temperature to obtain the heat storage material.
The preparation of the eutectic salt with crystal water removed comprises the following steps:
A. and (2) mixing the following components in percentage by mass: drying the aqueous solution prepared by proportioning the 48 industrial-grade sodium carbonate and the 48 industrial-grade potassium carbonate in an oven at the temperature of 80-120 ℃ to obtain eutectic salt;
B. and calcining, grinding and sieving the eutectic salt at 500 ℃ to obtain the eutectic salt with crystal water removed.
Preparing powder inorganic clay, comprising:
A. drying inorganic clay at 120 deg.C;
B. and grinding and sieving the dried inorganic clay to obtain the powdery inorganic clay.
Preparing powder magnesium oxide, which comprises the following steps:
A. drying the magnesium oxide at 120 ℃;
B. and grinding and sieving the dried magnesium oxide to obtain powder magnesium oxide.
When preparing eutectic salt for removing crystal water, preparing inorganic clay powder and preparing magnesium oxide powder, the aperture of the used screen is 200 meshes in the sieving process.
The sieving in the step (3) adopts a 15-mesh sieve;
in the pressurizing treatment of the step (4), the treatment is carried out for 30s under the pressure of 8 t;
the preset temperature in the step (5) is 800-1000 ℃.
The heat storage material is applied to solar photo-thermal, geothermal, industrial waste heat and/or low-grade waste heat.
The heat storage device is a solar photo-thermal conversion device, as shown in fig. 3;
the solar photo-thermal conversion device comprises:
a cylindrical heat storage material container (1);
the top cover of the cylindrical heat storage material container (1) comprises an inner rotating cover (2) and an outer rotating cover (3) which are axially provided with through holes respectively; the outer rotating cover is provided with a heat conduction optical fiber (4);
the rest part of the cylindrical heat storage material is sequentially provided with a vacuum heat insulation layer (5) and a heat preservation layer (6) from inside to outside.
The external rotating cover is made of polystyrene foam plastics;
a reflecting layer (7) is arranged outside the outer rotating cover.
When the through hole of the outer rotating cover (3) rotates to be aligned with the through hole of the inner rotating cover (2), and when the temperature of the heat storage material is lower than the preset temperature, the heat storage material is heated by connecting external strong light through a heat conduction optical fiber (4) on the outer rotating cover (3);
when the through hole of the outer rotary cover (3) is rotated to be aligned with the through hole of the inner rotary cover (2), the heat conducting optical fiber (4) transmits the heat energy of the heat storage material of high temperature to the outside.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (14)
1. The heat storage material is characterized by comprising the following components in parts by weight:
55-60 parts of eutectic salt, 10-15 parts of inorganic clay, 15-20 parts of nano magnesium oxide and 5-20 parts of magnesium oxide.
2. The heat storage material of claim 1, wherein the heat storage material comprises the following components in parts by weight:
55 parts of eutectic salt, 10 parts of inorganic clay, 15 parts of nano magnesium oxide and 20 parts of magnesium oxide.
3. The heat storage material of claim 1, wherein the heat storage material comprises the following components in parts by weight:
60 parts of eutectic salt, 15 parts of inorganic clay, 20 parts of nano magnesium oxide and 5 parts of magnesium oxide.
4. The heat storage material of claim 1 wherein the eutectic salt comprises technical grade sodium carbonate and technical grade potassium carbonate in a mass ratio of 52: 48.
5. The heat storage material of claim 1 wherein the inorganic clay is an industrial grade inorganic clay.
6. The heat storage material of claim 1 wherein the nano-magnesia has a particle size of 30 nm.
7. The heat storage material of claim 1 wherein the magnesium oxide has a particle size of 30-80 μm.
8. The heat storage material of claim 1, wherein the heat storage material is a heat storage material for use in solar photo-thermal, geothermal, industrial waste heat and/or low grade waste heat.
9. A method of preparing a heat storage material according to any of claims 1 to 8, characterized in that the method comprises:
(1) preparing eutectic salt, powder inorganic clay and powder magnesium oxide with crystal water removed;
(2) mixing the eutectic salt with the crystal water removed and the powdery inorganic clay to obtain a mixture, and carrying out atomization treatment on the mixture;
(3) after sieving the mixture subjected to atomization treatment, laying nano magnesium oxide on the surface of the mixture;
(4) mixing the mixture laid with the nano magnesium oxide and the powdered magnesium oxide, and pressurizing to obtain a heat storage material green body;
(5) and sintering the heat storage material green body in a muffle furnace at a preset temperature to obtain the heat storage material.
10. The method of claim 9, wherein the preparing the eutectic salt with crystal water removed comprises:
A. and (2) mixing the following components in percentage by mass: drying the aqueous solution prepared by proportioning the 48 industrial-grade sodium carbonate and the 48 industrial-grade potassium carbonate in an oven at the temperature of 80-120 ℃ to obtain eutectic salt;
B. and calcining, grinding and sieving the eutectic salt at 500 ℃ to obtain the eutectic salt with crystal water removed.
11. The method of claim 9, wherein preparing the powdered inorganic clay comprises:
A. drying inorganic clay at 120 deg.C;
B. and grinding and sieving the dried inorganic clay to obtain the powdery inorganic clay.
12. The method of claim 9, wherein preparing powdered magnesium oxide comprises:
A. drying the magnesium oxide at 120 ℃;
B. and grinding and sieving the dried magnesium oxide to obtain powder magnesium oxide.
13. The method of any one of claims 10-12, wherein the screening is performed using a 200 mesh screen.
14. The method of preparation according to claim 9,
the sieving in the step (3) adopts a 15-mesh sieve;
in the pressurizing treatment of the step (4), the treatment is carried out for 30s under the pressure of 8 t;
the preset temperature in the step (5) is 800-1000 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810858020.0A CN110776875A (en) | 2018-07-31 | 2018-07-31 | Heat storage material and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810858020.0A CN110776875A (en) | 2018-07-31 | 2018-07-31 | Heat storage material and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013012907A2 (en) * | 2011-07-18 | 2013-01-24 | University Of South Florida | Method of encapsulating a phase change material with a metal oxide |
| CN103525376A (en) * | 2013-09-18 | 2014-01-22 | 中国科学院过程工程研究所 | Heat storage material for recovering industrial exhaust heat and preparation method and application thereof |
| CN107828384A (en) * | 2017-10-20 | 2018-03-23 | 华北电力大学 | A kind of core shell structure for the anti-fused salt volatilization of high-temperature phase-change heat storage material |
-
2018
- 2018-07-31 CN CN201810858020.0A patent/CN110776875A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013012907A2 (en) * | 2011-07-18 | 2013-01-24 | University Of South Florida | Method of encapsulating a phase change material with a metal oxide |
| CN103525376A (en) * | 2013-09-18 | 2014-01-22 | 中国科学院过程工程研究所 | Heat storage material for recovering industrial exhaust heat and preparation method and application thereof |
| CN107828384A (en) * | 2017-10-20 | 2018-03-23 | 华北电力大学 | A kind of core shell structure for the anti-fused salt volatilization of high-temperature phase-change heat storage material |
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Application publication date: 20200211 |
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