Large sand heat storage device

Abstract

The large sand heat storage device comprises a sand storage container, a heat storage sand layer, a heating system and a heat conduction system, wherein the sand storage container is filled with the heat storage sand layer, the heating system is used for heating the heat storage sand layer, and the heat conduction system is used for outputting heat in the heat storage sand layer. The heating system comprises a heat dissipation pipe set arranged in the sand storage container and an electric heating rod stretching into the heat dissipation pipe set. The heat conduction system comprises a heat collection pipe set arranged in the sand storage container and a guide-out unit driving heat conduction media in the heat collection pipe set to flow. The sand storage container is a rectangular box body, and the inner space of the sand storage container is filled with the heat storage sand layer; the radiating pipe group is vertically connected to a main pipe on the inner side of the top wall of the sand storage container and a plurality of branch pipes radially arranged at the lower end of the main pipe, the internal space of the branch pipes is communicated with the internal space of the main pipe, and the internal space of the main pipe is communicated with the outside of the sand storage container. The sand heat storage device is low in use cost and high in heat storage and heat transfer efficiency.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a large-scale sand heat storage device. Background Art

[0002] Phase change thermal storage is a type of thermal energy storage that uses the thermal storage characteristics of phase change materials to store or release the heat therein, thereby achieving a certain degree of regulation and control of the temperature of the environment surrounding the phase change material, thereby changing the temporal and spatial distribution of energy use and improving energy efficiency.

[0003] However, the energy storage materials used in existing heat storage and heat exchange equipment are mostly water or inorganic salt hydrates, which are easy to dehydrate and difficult to change phases repeatedly, thereby increasing the cost of use. Utility Model Content

[0004] The purpose of this application is to provide a large-scale sand heat storage device with low cost of use and high heat storage and heat transfer efficiency.

[0005] The large-scale sand heat storage device provided in this application adopts the following technical solution:

[0006] A large-scale sand heat storage device comprises a sand storage container, a heat storage sand layer filled in the sand storage container, a heating system for heating the heat storage sand layer, and a heat conduction system for outputting heat in the heat storage sand layer; the heating system comprises a heat dissipation pipe group arranged in the sand storage container and an electric heating rod extending into the heat dissipation pipe group, and the heat conduction system comprises a heat collection pipe group arranged in the sand storage container and an output unit for driving the heat conduction medium in the heat collection pipe group to flow.

[0007] As a preferred technical solution of the present application, the sand storage container is configured as a rectangular box, and the heat storage sand layer fills the inner space of the sand storage container.

[0008] As a preferred technical solution of the present application, the heat dissipation pipe group is vertically connected to a main pipe on the inner side of the top wall of the sand storage container and a plurality of branch pipes radially arranged at the lower end of the main pipe, the internal space of the branch pipe is connected to the internal space of the main pipe, and the internal space of the main pipe is connected to the outside of the sand storage container.

[0009] As a preferred technical solution of the present application, the electric heating rod is provided with a plurality of single rods, each of which is partially located in the main pipe and partially penetrates the branch pipe.

[0010] As a preferred technical solution of the present application, a centralizing plate is fixedly provided at one end of the electric heating rod, the centralizing plate centralizes the multiple single rods, and the centralizing plate blocks the outer end opening of the main pipe.

[0011] As a preferred technical solution of the present application, the heat collection tube group includes a plurality of heat collection tubes laid horizontally in the heat storage sand layer and a heat collection box connected to the same end of the heat collection tubes. The heat collection tubes are evenly laid in the heat storage sand layer, and the heat collection box is located at one end of the sand storage container.

[0012] As a preferred technical solution of the present application, heat-conducting holes are evenly distributed on the tube wall of the heat collecting tube, and the outer side of the tube wall of the heat collecting tube is wrapped with a sand-blocking net.

[0013] As a preferred technical solution of the present application, the export unit includes a heat transfer pipeline connected to the heat collecting box and an air heat pump connected to the heat transfer pipeline, and the end of the heat transfer pipeline is connected to the heat supply carrier.

[0014] In summary, the present application includes at least one of the following beneficial technical effects:

[0015] 1. The device of the present application can utilize valley electricity to uniformly heat the heat storage sand through dispersedly arranged heat dissipation pipe groups and electric heating rods, convert the electrical energy of valley electricity into thermal energy and store it in the heat storage sand, and then utilize an air heat pump to convert the heat in the heat storage sand into high-temperature air through a heat collection pipe group to supply heat to a heat carrier. The entire device has low use cost and high heat storage and heating efficiency.

[0016] 2. The heat dissipation pipe group adopts a radial structure, which can be better dispersed into the heat storage sand layer, so that more heat can be stored in the heat storage sand layer, and the heat storage efficiency of the heat storage sand is improved.

[0017] 3. The heat collecting pipes are evenly distributed in the heat storage sand layer, which can collect the heat stored in the heat storage sand layer more efficiently, and concentrate it through the heat collecting box, and then be transported to the link that needs heating by the air heat pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the internal structure of the heat storage device according to an embodiment of the present application;

[0019] Figure 2 is a schematic diagram of the structure of the heating system in an embodiment of the present application;

[0020] Figure 3 is a schematic structural diagram of a heat conduction system in an embodiment of the present application;

[0021] In the figure, 1. sand storage container; 2. heat storage sand layer; 3. heating system; 31. heat dissipation pipe group; 311. main pipe; 312. branch pipe; 32. electric heating rod; 33. concentrator; 4. label performance testing mechanism; 41. heat collecting pipe group; 411. heat collecting pipe; 412. heat collecting box; 413. heat conducting hole; 414 sand blocking net; 42. export unit; 421. heat transfer pipeline; 422. air heat pump. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1 -Attached Figure 3 , further details of this application are given.

[0023] Embodiment: This application proposes a large-scale sand heat storage device, referring to Figure 1 The heat storage device includes a sand storage container 1, a heat storage sand layer 2, a heating system 3 and a heat conduction system 4. The heat storage sand layer 2 fills the inner space of the sand storage container 1. The heating system 3 and the heat conduction system 4 are partially located in the sand storage container 1 and partially located outside the sand storage container 1. The heating system 3 heats the heat storage sand layer 2 and stores heat, and the heat conduction system 4 extracts the heat energy in the heat storage sand layer 2 and supplies it to the heat supply carrier.

[0024] The sand storage container 1 is configured as a rectangular box with air holes on the box wall and a heat insulation material layer pasted on the inner surface, which can prevent the heat in the sand storage container 1 from being lost to the outside through the box wall. The heat storage sand layer 2 fills the internal space of the sand storage container 1.

[0025] Reference Figure 1 and 2 The heating system 3 is evenly distributed in the sand storage container 1, including a heat dissipation pipe group 31, an electric heating rod 32 and a concentrating plate 33. The heat dissipation pipe group 31 is arranged in the sand storage container 1, including a main pipe 311 and a branch pipe 312. The main pipe 311 is a round pipe, which is vertically connected to the inner side of the top wall of the sand storage container 1. The top wall of the sand storage container 1 is provided with an opening communicating with the inner space of the main pipe 311. A plurality of branch pipes 312 are arranged, which are radially fixedly connected to the lower end of the main pipe 311. The inner space of the branch pipe 312 is communicated with the inner space of the main pipe 311, and the end away from the main pipe 311 is closed.

[0026] The electric heating rod 32 includes a plurality of single rods, the number of which is the same as the number of branch pipes 312. Each single rod is inserted from the outer end opening of the main pipe 311, so that part of the single rod is located in the main pipe 311, and the rest is inserted into the branch pipe 312. A single rod is inserted into each branch pipe 312, and multiple single rods are gathered into a bundle in the main pipe 311. The end of the single rod passing through the main pipe 311 is uniformly fixed on a circular concentrating plate 33 and connected to a power source, and the power source heats the electric heating rod 32. The concentrating plate 33 can block the upper end opening of the main pipe 311 to prevent excessive heat loss. The electric heating rods 32 are dispersed through the branch pipes 312 and can heat a larger space.

[0027] Reference Figure 1 and 3 The heat conduction system 4 includes a heat collection tube group 41 and a derivation unit 42. The heat collection tube group 41 is installed in the sand storage container 1, and the derivation unit 42 is installed outside the sand storage container 1. Air is used as a flowing heat conduction medium in the heat conduction system 4.

[0028] The heat collecting tube group 41 includes a heat collecting tube 411 and a heat collecting box 412. A plurality of heat collecting tubes 411 are arranged in parallel and evenly. In this embodiment, the heat collecting tubes 411 are divided into two layers in the heat storage sand layer 2, and are laid in the heat storage sand layer 2 in the horizontal direction and distributed on the upper and lower sides of the branch pipe 312. The same end of all the heat collecting tubes 411 is connected to the heat collecting box 412. The heat collecting box 412 is a rectangular box, located at one end in the sand storage container 1. A heat insulating material layer is arranged on the wall of the heat collecting box 412 to prevent the energy entering the heat collecting box 412 from flowing back into the heat storage sand layer 2. In order to facilitate the heat in the heat storage sand layer 2 to enter the heat collecting tube 411 with the flow of air, heat conducting holes 413 are evenly distributed on the wall of the heat collecting tube 411 in this embodiment, and hot air enters the heat collecting tube 411 through the heat conducting holes 413. In order to prevent sand from entering the heat collecting tube 411 through the heat conducting holes 413 , the outer side of the tube wall of the heat collecting tube 411 is wrapped with a sand blocking net 414 , and the sand blocking net 414 allows air to pass through.

[0029] The export unit 42 includes a heat transfer pipe 421 and an air heat pump 422. One end of the heat transfer pipe 421 is connected to the side of the heat collecting box 412 away from the heat collecting pipe 411, and the other end passes through the sand storage container 1 and is connected to the carrier that needs heat supply. The air heat pump 422 is connected to the heat transfer pipe 421 to drive the hot air to flow along the heat collecting pipe 411, the heat collecting box 412 and the heat transfer pipe 421 in sequence to transport the heat out.

[0030] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A large sand heat storage device, characterized in that: The invention comprises a sand storage container (1), a heat storage sand layer (2) filled in the sand storage container (1), a heating system (3) for heating the heat storage sand layer (2), and a heat conduction system (4) for outputting heat in the heat storage sand layer (2); the heating system (3) comprises a heat dissipation pipe group (31) arranged in the sand storage container (1) and an electric heating rod (32) extending into the heat dissipation pipe group (31); and the heat conduction system (4) comprises a heat collection pipe group (41) arranged in the sand storage container (1) and an output unit (42) for driving the heat conduction medium in the heat collection pipe group (41) to flow.

2. A large-scale sand heat storage device according to claim 1, characterized in that: The sand storage container (1) is configured as a rectangular box, and the heat storage sand layer (2) fills the inner space of the sand storage container (1).

3. A large-scale sand heat storage device according to claim 1, characterized in that: The heat dissipation pipe group (31) is vertically connected to a main pipe (311) on the inner side of the top wall of the sand storage container (1) and a plurality of branch pipes (312) radially arranged at the lower end of the main pipe (311); the internal space of the branch pipe (312) is connected to the internal space of the main pipe (311); and the internal space of the main pipe (311) is connected to the outside of the sand storage container (1).

4. A large-scale sand heat storage device according to claim 3, characterized in that: The electric heating rod (32) is provided with a plurality of single rods, each of which is partially located in the main pipe (311) and partially penetrates the branch pipe (312).

5. A large-scale sand heat storage device according to claim 3, characterized in that: A centralizing plate (33) is fixedly provided at one end of the electric heating rod (32), the centralizing plate (33) centralizes the plurality of single rods, and the centralizing plate (33) blocks the outer end opening of the main pipe (311).

6. A large-scale sand heat storage device according to claim 1, characterized in that: The heat collecting tube group (41) comprises a plurality of heat collecting tubes (411) transversely laid in the heat storage sand layer (2) and a heat collecting box (412) connected to the same end of the heat collecting tubes (411); the heat collecting tubes (411) are evenly laid in the heat storage sand layer (2); and the heat collecting box (412) is located at one end of the sand storage container (1).

7. A large-scale sand heat storage device according to claim 6, characterized in that: The heat collecting tube (411) has heat conducting holes (413) evenly distributed on the tube wall, and the outer side of the tube wall of the heat collecting tube (411) is wrapped with a sand blocking net (414).

8. A large-scale sand heat storage device according to claim 6, characterized in that: The export unit (42) comprises a heat transfer pipe (421) connected to the heat collection box (412) and an air heat pump (422) connected to the heat transfer pipe (421); the end of the heat transfer pipe (421) is connected to a heat supply carrier.

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