KR101508155B1 - Heat strage material used in heat storage tank, and method for producing heat strage material used in heat storage tank - Google Patents

Abstract

The present invention relates to a process for producing a clay-mica mixture, comprising mixing 20 to 80 parts by weight of clay and 20 to 80 parts by weight of mica, Preparing a clay-mica mixture having a hollow portion; Forming a hole in the sphere and filling the heat medium through the hole; And filling the hole with clay after filling the heating medium, and a heat storage material used in the heat storage tank related to the method.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a heat storage material used in a heat storage tank and a heat storage material used in a heat storage tank,

The present invention relates to a heat storage material used in a heat storage tank and a method for manufacturing a heat storage material used in the heat storage tank for absorbing heat more quickly and preserving the heat for a longer time.

Recently, climate problems have become an issue due to the emission of greenhouse gases due to the large use of fossil fuels. Moreover, as industrialization in emerging economies such as China is rapidly taking place, concerns over exhaustion of fossil fuels such as oil and coal are increasing.

Accordingly, technology for replacing fossil fuels such as solar light, solar heat, wind power, tidal force, and nuclear power has been developed. Particularly, in the case of solar thermal and solar photovoltaic systems, they are used for domestic business, power generation, and the like.

The solar thermal system generally comprises a heat collecting plate for collecting heat from the sun, a heat storage tank for storing heat collected from the heat collecting plate, and a heat exchanger for use in heating equipment using the heat of the heat storage tank.

In the case of solar thermal systems, because of the inconsistency between solar energy supply time and demand time, thermal energy storage is required to effectively utilize solar heat concentrated in daylight hours, or to effectively recover waste heat, thus requiring a heat storage tank. These heat storage tanks must absorb the heat quickly and maintain that heat for a long time.

In the case of using only water as a heat storage medium in a heat storage tank, it is difficult to store heat at a temperature of 100 degrees centigrade or more, pressure due to steam generation occurs, and there is a risk of failure and explosion. As a result, the heat storage medium is lost and the overall efficiency is lowered.

SUMMARY OF THE INVENTION The present invention is conceived to solve the problems described above, and it is an object of the present invention to provide a method of manufacturing a heat storage material used in a heat storage tank and a heat storage material used in a heat storage tank for absorbing heat more quickly and preserving the heat for a longer time .

 The heat storage material used in the heat storage tank, which is one embodiment of the invention, can be sintered by mixing clay and mica.

Here, the heat storage material may be a composition comprising 20-80 parts by weight of the clay and 20-80 parts by weight of the mica.

Here, the heat storage material may be spherical.

Here, a hollow portion may be formed at the center of the heat storage material.

Here, the hollow portion may be filled with a heating medium at room temperature.

Here, the heating medium may include sodium nitrate, potassium nitrate, lithium nitrate, and magnesium nitrate hexahydrate.

Here, the heating medium may be a slurry in which sodium nitrate, potassium nitrate, lithium nitrate, and magnesium nitrate hexahydrate are mixed with propylene glycol.

Here, the heating medium may maintain a solid or slurry state at room temperature, and may change phase to a liquid state at 120 ° C or higher.

Another embodiment of the present invention is a thermal storage material used in a thermal storage tank, comprising: a first clay layer having a spherical shell shape having a hollow portion; A first mica layer applied over the first clay layer; A second clay layer applied over the first mica layer; And a second mica layer applied over the second clay layer.

Here, the heat storage material may further include a first hollow layer, a second hollow layer and a third hollow layer formed between the first clay layer and the first mica layer, and between the second clay layer and the second mica layer .

The heat storage material may further include a heating medium to be filled in the hollow portion.

In another embodiment of the present invention, there is provided a method for producing a heat storage material for a thermal storage tank, comprising the steps of: preparing a clay-mica mixture by mixing 20-80 parts by weight of clay and 20-80 parts by weight of mica; Preparing a clay-mica mixture having a hollow portion; Forming a hole in the sphere and firing the sphere; Filling the heating medium through the hole; And filling the hole with clay after filling the heating medium.

Here, the heating medium may include sodium nitrate, potassium nitrate, lithium nitrate, and magnesium nitrate hexahydrate.

Here, the heating medium may be a mixture of sodium nitrate and potassium nitrate in a ratio of 6: 4.

 In another embodiment of the present invention, a method for manufacturing a heat storage material for use in a thermal storage tank includes the steps of: forming a spherical shell-like first clay layer having a hollow portion; Coating a first mica layer on the first clay layer; Coating a second clay layer on the first mica layer; Coating a second mica layer over the second clay layer; Forming a hole in a plurality of sphere-shaped spheres coated with the two mica layers and firing the spheres; Filling the hollow portion with a heating medium through the hole; And filling the hole with the heat medium after filling the hole.

Here, the method of manufacturing the heat storage material used in the heat storage tank may further include forming the first hollow layer, the second hollow layer and the third hollow layer by firing the plurality of spherical spheres.

According to an embodiment of the present invention having the above-described structure, it is possible to provide a heat storage material capable of maintaining the absorbed heat for a long period of time while having excellent thermal conductivity, thereby enhancing the thermal efficiency of the solar thermal system.

1 is a perspective view of a heat storage material used in a heat storage tank according to an embodiment of the present invention.
2 is a sectional view of a heat storage material used in a heat storage tank according to an embodiment of the present invention.
3 is a sectional view of a heat storage material used in a heat storage tank according to another embodiment of the present invention.
FIG. 4 is a flowchart for explaining a method of manufacturing a heat storage material used in the thermal storage tank illustrated in FIG. 2; FIG.
FIG. 5 is a flowchart for explaining a method of manufacturing a heat storage material used in the thermal storage tank illustrated in FIG. 3;

Hereinafter, a method of manufacturing a thermal storage material used in a thermal storage tank and a thermal storage material used in a thermal storage tank according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a heat storage material used in a heat storage tank according to an embodiment of the present invention. FIG. 2 is a sectional view of a heat storage material used in a heat storage tank according to an embodiment of the present invention. Fig. As shown in FIG. 1, the heat storage material 100 used in the heat storage tank, which is one embodiment of the present invention, is formed as a whole, and the heat storage material 100 is formed by mixing clay and mica. As shown in FIG. 2, one end of the spherical heat storage material 100 is provided with a hollow portion formed inside the heat storage material 100 for filling the heating medium 120 A hole 110 is formed.

Wherein the sphere 101 consists of a composition comprising 20-80 parts by weight of clay and 20-80 parts by weight of said mica. When the amount of the clay is 20 parts by weight or less, the moldability is deteriorated. The mica is a material capable of increasing thermal conductivity and accumulating heat well. When the amount of the mica is 20 parts by weight or less, 20 parts by weight of the mica is set to 20 parts by weight since sufficient storage effect required by the present invention is not exhibited.

3 is a cross-sectional view of another embodiment of the present invention having a plurality of spherical shapes. 3, the thermal storage material according to another embodiment of the present invention includes a first clay layer 111 having a spherical shell shape having a hollow portion, a first hollow layer 112 formed on the first clay layer 111, A first clay layer 114 disposed on the first hollow layer 112 and coated on the first clay layer 111, a second clay layer 114 applied on the first mica layer 113, A second hollow layer 113-1 formed between the first clay layer 113 and the second clay layer 114, a third hollow layer 115 formed on the second clay layer 114, 114 and a second mica layer 116 applied over the second mica layer. That is, although the example in which the mica layer and the clay layer are two in this example is described, the number of the mica layer and the clay layer may be plural, but the number is not limited thereto. That is, the spherical heat storage material has improved thermal conductivity and warming property to enhance the heat storage function. The clay layer enhances formability and stability, while the mica layer strengthens the thermal conductivity and heat storage function.

2 and 3, the heating medium is filled with a heating medium. As the heating medium 120, sodium nitrate, potassium nitrate, lithium nitrate, magnesium nitrate hexahydrate or the heating medium 120 may be nitric acid Sodium, potassium nitrate, lithium nitrate, and magnesium nitrate hexahydrate may be slurries mixed with water. The sodium nitrate, potassium nitrate, lithium nitrate, and magnesium nitrate hexahydrate may be appropriately mixed according to a desired melting point.

The heat absorbed in the sphere is conducted to the heating medium 120, and the heating medium 120 maintains the elevated temperature, so that the heat storage efficiency can be maximized. In particular, the heat medium stores heat in the form of solid or slurry at a low temperature (i.e., room temperature), and stores more heat while changing phase to liquid at a temperature higher than about 120 캜.

Although not shown in the drawing, the mica layer is coated on the inner and outer surfaces of the sphere mixed with clay and mica in the example shown in Fig. 2, and then the clay layer is further coated and sintered to strengthen the thermal conductivity and heat storage function It is possible.

Hereinafter, a method of manufacturing the heat storage material used in the thermal storage tank having the above-described structure will be described.

4 is a flowchart for explaining a method of manufacturing a heat storage material used in the heat storage tank illustrated in Fig. In order to produce the heat storage material shown in Fig. 2, 20 to 80 parts by weight of clay and 20 to 80 parts by weight of mica are mixed to prepare a clay-mica mixture (S1). Next, the clay-mica mixture is made into spherical spheres with hollows (S3). After the sphere made of the clay-mica mixture is dried, a hole is formed in the sphere (S5). After this hole is formed, the spheres are sintered (not shown). Next, the hollow portion formed inside the sphere is filled with a heating medium (S7). After the heating medium is filled, the hole is filled with clay to complete the production of the heat storage material (S9). The heat storage material described in FIG. 2 can be manufactured through the above-described processes.

Fig. 5 is a flowchart for explaining a method of manufacturing a heat storage material used in the thermal storage tank illustrated in Fig. 3. Fig. As shown in FIG. 5, a spherical shell-like first clay layer 111 having a hollow portion is prepared (S11). The first clay layer 114 is then coated on the first clay layer 111 and the first clay layer 114 is coated on the first mica layer 113. The second clay layer 114 is coated on the first clay layer 111, 2 mica layer 116 is coated (S13, S15, S17). Holes are formed in a plurality of spherical spheres having been subjected to the above steps and then the spheres of the spherical spheres are fired to form the first hollow layer 112, the second hollow layer 113-1, and the third The hollow layer 115 is formed (S19). Then, the hollow portion is filled with the heating medium through the holes (S21, S23). After the heating medium is filled, the hole is filled (S25).

According to an embodiment of the present invention having the above-described structure, it is possible to provide a heat storage material capable of maintaining the absorbed heat for a long period of time while having excellent thermal conductivity, thereby enhancing the thermal efficiency of the solar thermal system.

The method of manufacturing the heat storage material used in the thermal storage tank and the thermal storage material used in the thermal storage tank described above can be applied to a limited number of configurations and methods of the embodiments described above, All or some of the embodiments may be selectively combined.

100: Heat storage material
101: clay-mica mixture sphere
110: hole
111: first clay layer
112: first hollow layer
113: first mica layer
113-1: second hollow layer
114: Second clay layer
115: Third hollow layer
116: second mica layer
120: heat medium

Claims (15)

A latent heat material in which 20 to 80 parts by weight of clay and 20 to 80 parts by weight of mica are mixed and sintered to maintain moldability and prevent cracking due to impact, and a hollow part is formed therein; And
And a heating medium which is filled in the hollow portion and is made of a phase change material.
delete delete delete delete The method according to claim 1,
Wherein the heating medium comprises sodium nitrate, potassium nitrate, lithium nitrate, and magnesium nitrate hexahydrate.
The method according to claim 1,
Wherein the heating medium is a slurry in which sodium nitrate, potassium nitrate, lithium nitrate, and magnesium nitrate hexahydrate are mixed in water.
8. The method of claim 7,
The heat medium maintains a solid or slurry state at room temperature and is phase-changed into a liquid state at 120 DEG C or higher.
A first clay layer having a spherical shell shape having a hollow portion,
A first mica layer applied over the first clay layer;
A second clay layer applied over the first mica layer; And
And a second mica layer applied on the second clay layer.
10. The method of claim 9,
The heat storage material
Second, and third hollow layers formed between the first clay layer and the first mica layer, and between the second clay layer and the second mica layer, respectively.
11. The method of claim 10,
Further comprising a heating medium to be filled in the hollow portion.
20 to 80 parts by weight of clay and 20 to 80 parts by weight of mica are mixed to prepare a clay-mica mixture;
Preparing a sphere having a hollow portion using the clay-mica mixture;
Forming a hole in the sphere and filling the heat medium through the hole; And
And filling the hole with clay after filling the heating medium.
13. The method of claim 12,
Wherein the heating medium comprises sodium nitrate, potassium nitrate, lithium nitrate, and magnesium nitrate hexahydrate.
Forming a first clay layer in the form of a spherical shell having a hollow portion;
Coating a first mica layer on the first clay layer;
Coating a second clay layer on the first mica layer;
Coating a second mica layer over the second clay layer;
Forming a hole in a plurality of spherical spheres having the two mica layers coated thereon and firing the same;
Filling the hollow portion with a heating medium through the hole; And
And filling the hole with the heat medium, and then filling the hole with the heat medium.
15. The method of claim 14,
Further comprising forming the first hollow layer, the second hollow layer and the third hollow layer by firing the spherical spheres in the plurality of spherical shapes.

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