Heat exchange device for a thermal storage system

Abstract

The application relates to the technical field of heat storage, and discloses a heat exchange device for a heat storage system, which comprises a heat storage box filled with first solid heat storage materials; metal plates embedded in the first solid heat storage materials, the metal plates being distributed at equal intervals in a vertical direction, the metal plates being filled with second solid heat storage materials; and heat exchange pipes penetrating through two ends of the heat storage box in the vertical direction, the first solid heat storage materials defining heat exchange flow channels in the vertical direction, the metal plates being integrally formed with metal rib plates in regions overlapping with the heat exchange flow channels, the metal rib plates being provided with through holes in the centers, and the heat exchange pipes being arranged in the through holes; wherein, in a heat release direction, the pipe diameter of the heat exchange pipes and the hole diameter of the through holes gradually decrease. The heat exchange device can effectively reduce the gap proportion in the heat storage device, improve the heat storage density, improve the heat transfer effect of the heat exchange device, and ensure uniform heat release.

Description

Technical Field

[0001] This invention relates to the field of thermal storage technology, and in particular to a heat exchange device for a thermal storage system. Background Technology

[0002] Most common fixed solid thermal energy storage methods rely on the stacking and arrangement of a large number of fixed thermal energy storage units. When stacking, a certain amount of space needs to be reserved as a flow channel for heat exchange fluid to improve heat exchange efficiency.

[0003] However, this type of thermal storage structure also results in a high porosity within the storage device, which can easily lead to a decrease in thermal density. Furthermore, during heat exchange, due to heat transfer, the temperature at the top of the storage device is often higher than the temperature at the bottom. Because solid thermal storage materials have a high specific heat, the heat circulation and release can easily affect the durability of the solid thermal storage material in this area, leading to uneven heat release during heat exchange. Therefore, there is an urgent need for a heat exchange device for thermal storage systems to solve these problems. Summary of the Invention

[0004] The purpose of this invention is to provide a heat exchange device for a thermal storage system to solve the problems existing in the prior art. It can effectively reduce the void ratio in the thermal storage device, increase the thermal storage density, improve the heat transfer effect of the heat exchange device, and ensure uniform heat release.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a heat exchange device for a thermal storage system, comprising:

[0006] The thermal storage box is filled with a first solid thermal storage material.

[0007] A metal plate is embedded in the first solid heat storage material. Several metal plates are distributed at equal intervals along the vertical direction. The metal plates are filled with a second solid heat storage material.

[0008] A heat exchange tube extends vertically through both ends of the heat storage box. The first solid heat storage material defines a heat exchange channel at its center in the vertical direction. A metal rib is integrally formed in the area where the metal plate overlaps with the heat exchange channel. A through hole is opened in the center of the metal rib, and the heat exchange tube passes through the through hole.

[0009] Along the heat release direction, the diameter of the heat exchange tube and the diameter of the through hole gradually decrease.

[0010] Preferably, the metal ribs are projected vertically toward the heat exchange tube to define a heat exchange zone on the outer wall of the heat exchange tube, and a plurality of heat exchange holes are provided in the heat exchange zone, the heat exchange holes penetrating the heat exchange tube.

[0011] Preferably, a gap is provided between the outer wall of the heat exchange tube and the inner wall of the adjacent through hole, and the planar area of ​​the metal rib gradually increases along the heat release direction so that the gap remains constant.

[0012] Preferred options also include:

[0013] The heat exchange channel has a square structure, and four isolation plates are provided, which are distributed around the inner wall of the heat exchange channel.

[0014] The heat exchange channel extends vertically from the adjacent sides of the two adjacent isolation plates, and the portion of the isolation plate that extends into the first solid heat storage material is integrally formed with a connecting plate. The connecting plate is arranged between two adjacent metal plates, and the two adjacent connecting plates are fixedly connected.

[0015] Preferably, a transition plate is fixedly connected to the side of the metal rib away from the through hole, the transition plate penetrates the partition plate, the transition plate is integrally formed with the metal plate, and the transition plate does not contact the connecting plate.

[0016] Preferably, the bottom of the heat storage box is fixedly connected to columns around its perimeter, a first connecting seat is fixedly connected to the center of the bottom surface of the heat storage box, a second connecting seat is fixedly connected to the center of the top surface of the heat storage box, and the two ends of the heat exchange tube are respectively connected to the first connecting seat and the second connecting seat.

[0017] Preferred options also include:

[0018] A fan is installed on one side of the heat storage box, and the air outlet of the fan is connected to the first connecting seat through a connecting pipe;

[0019] A steam generator is located on the other side of the heat storage tank. The second connecting seat is connected to the steam generator through a guide pipe. The guide pipe is used to transport the heat exchange medium. The steam generator has a cold air port and a steam port. The cold air port is connected to the air inlet of the fan through a delivery pipe.

[0020] Preferably, a high-voltage terminal block is provided on one side of the outer wall of the heat storage box, and the high-voltage terminal block is used to connect to the heating element for power supply.

[0021] The present invention discloses the following technical effects:

[0022] 1. This invention utilizes metal plates and metal ribs to increase the heat exchange rate from the first solid thermal storage material to the second solid thermal storage material and finally to the heat exchange tube. Furthermore, the heat exchange space inside the entire thermal storage box is confined within the heat exchange channel. By inserting the heat exchange tube through the through hole, the heat exchange tube passes through several metal plates and metal ribs sequentially along the heat exchange direction, achieving a gradient increase in heat. This not only improves heat exchange efficiency but also effectively reduces the proportion of heat exchange space within the thermal storage system, thus significantly enhancing the thermal storage density of the first and second solid thermal storage materials.

[0023] 2. The heat exchange tubes run vertically through the heat storage box, with the heat-releasing end of the tubes exiting from the top of the box. This ensures that the heat exchange tubes release heat from the hottest area within the box, achieving uniform heat release. Simultaneously, the gradually decreasing diameter of the heat exchange tubes increases the velocity of the heat exchange medium, accelerating heat transfer efficiency. The gradually decreasing diameter of the through-holes also gradually increases the heat-releasing area of ​​the metal fins. Utilizing the rapid heat transfer of the metal fins, the heat exchange tubes not only increase the flow rate of the heat exchange medium but also gradually increase the amount of heat released, ultimately enhancing the overall heat exchange effect of the device. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a diagram showing the positional relationship between the thermal storage box and the fan in this invention;

[0026] Figure 2 This is a diagram showing the positional relationship between the first solid thermal storage material and the thermal storage box in this invention;

[0027] Figure 3 This is a diagram showing the connection relationship between the second connecting seat and the steam generator in this invention;

[0028] Figure 4 This is a diagram showing the positional relationship between the metal plate and the isolation plate in this invention;

[0029] Figure 5 This is a schematic diagram of the heat exchange tube and metal rib plate in this invention;

[0030] Figure 6 This is a diagram showing the connection relationship between the metal rib and the partition plate in this invention;

[0031] Figure 7This is a bottom view of several metal ribs in the present invention;

[0032] The components include: 1. Heat storage box; 2. First solid heat storage material; 3. Metal plate; 4. Second solid heat storage material; 5. Heat exchange tube; 6. Metal rib; 7. Heat exchange channel; 8. Heat exchange hole; 9. Isolation plate; 10. Connecting plate; 11. Transition plate; 12. Column; 13. First connecting seat; 14. Second connecting seat; 15. Fan; 16. Connecting pipe; 17. Steam generator; 18. Guide pipe; 19. High-pressure terminal block; 20. Delivery pipe. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Reference Figures 1-7 The present invention provides a heat exchange device for a thermal storage system, comprising:

[0036] The heat storage box 1 is filled with a first solid heat storage material 2.

[0037] A metal plate 3 is embedded in the first solid heat storage material 2. Several metal plates 3 are distributed at equal intervals along the vertical direction. The metal plate 3 is filled with a second solid heat storage material 4.

[0038] The heat exchange tube 5 runs vertically through both ends of the heat storage box 1. The first solid heat storage material 2 defines the heat exchange channel 7 along the center of the vertical direction. The area where the metal plate 3 overlaps with the heat exchange channel 7 is integrally formed with a metal rib 6. A through hole is opened in the center of the metal rib 6, and the heat exchange tube 5 passes through the through hole.

[0039] Along the heat release direction, the diameter of the heat exchange tube 5 and the diameter of the through hole gradually decrease.

[0040] This invention employs metal plates 3 and metal ribs 6 to increase the heat exchange rate from the first solid thermal storage material 2 to the second solid thermal storage material 4, and finally to the heat exchange tube 5. Furthermore, the heat exchange space within the entire thermal storage box 1 is confined within the heat exchange channel 7. By inserting the heat exchange tube 5 through the through-hole, it passes sequentially through several metal plates 3 and metal ribs 6 along the heat exchange direction, achieving a gradient increase in heat. This improves heat exchange efficiency while effectively reducing the proportion of heat exchange space within the thermal storage system, significantly increasing the thermal storage density of the first solid thermal storage material 2 and the second solid thermal storage material 4. Additionally, the heat exchange tube 5 penetrates the thermal storage box 1 vertically, with its heat-releasing end exiting from the top of the thermal storage box 1, ensuring that the heat exchange tube 5 releases heat from the area with the highest temperature within the thermal storage box 1, thus achieving uniform heat release. Simultaneously, by gradually reducing the diameter of the heat exchange tube 5, the velocity of the heat exchange medium passing through the heat exchange tube 5 can be gradually increased, accelerating the heat transfer efficiency. Combined with the gradual reduction of the through hole, the heat release area of ​​the metal fin 6 can be gradually increased. Utilizing the rapid heat transfer of the metal fin 6, the heat release of the heat exchange tube 5 can be gradually increased while accelerating the flow rate of the heat exchange medium, ultimately enhancing the overall heat release effect of the heat exchange device.

[0041] Furthermore, the metal rib 6 is projected vertically toward the heat exchange tube 5 to define a heat exchange zone on the outer wall of the heat exchange tube 5. A plurality of heat exchange holes 8 are provided in the heat exchange zone, and the heat exchange holes 8 penetrate the heat exchange tube 5.

[0042] By opening several heat exchange holes 8 on the side wall of the heat exchange tube 5 and aligning the heat exchange holes 8 with the metal rib plate 6, the metal rib plate 6 transfers heat from the metal plate 3, and the metal plate 3 releases the heat stored in the first solid heat storage material 2 and the second solid heat storage material 4, and releases the heat to the heat exchange medium in the heat exchange tube directly through the heat exchange holes 8.

[0043] Specifically, the heat exchange medium in this technical solution is gas, which facilitates the circulation and heat exchange of the gas through the heat exchange holes 8.

[0044] Furthermore, a gap is provided between the outer wall of the heat exchange tube 5 and the inner wall of the adjacent through hole, and the planar area of ​​the metal rib 6 gradually increases along the heat dissipation direction so that the gap remains constant.

[0045] By keeping the gap between the heat exchange tube 5 and the metal fin 6 constant, the amount of heat transfer and release can be kept stable. In addition, in this technical solution, the diameter of the heat exchange tube 5 is gradually reduced along the heat release direction. By keeping the gap between the metal fin 6 and the heat exchange tube 5 constant, the planar area of ​​the metal fin 6 extending into the heat exchange channel 7 can be gradually increased, forming a stepped heat release surface along the heat release direction. This is beneficial to promote efficient heat transfer from the metal fin 6 to the heat exchange tube 5 and improve the heat exchange effect.

[0046] Furthermore, it also includes:

[0047] The heat exchange channel 7 has a square structure with four isolation plates 9 distributed around the inner wall of the heat exchange channel 7.

[0048] Among them, the heat exchange channel 7 extends vertically from the adjacent sides of the two adjacent isolation plates 9, and the part of the isolation plate 9 that extends into the first solid heat storage material 2 is integrally formed with a connecting plate 10. The connecting plate 10 is arranged between two adjacent metal plates 3, and the two adjacent connecting plates 10 are fixedly connected.

[0049] Specifically, the isolation plate 9 can be made of materials such as honeycomb ceramic plate or silicon carbide. The isolation plate 9 separates the heat exchange channel 7 from the first solid heat storage material 2 and the metal plate 3. The connecting plate 10 extends into the gaps between the metal plates 3 and directly into the first solid heat storage material 2. The connecting plate 10 and the metal plate 3 not only support and fix the four isolation plates 9, but also allow the isolation plates 9 to have slots at the corresponding positions of the metal ribs 6, so that the metal ribs 6 and the metal plate 3 can be integrally formed and fixed, thus maintaining the stability of the isolation plates 9 in the heat storage box 1.

[0050] Furthermore, the isolation plate 9 is also a heat storage material. The structural strength of the isolation plate 9 is higher than that of the first solid heat storage material 2. The isolation plate 9 is embedded in the gap between several metal plates 3 to form a structural support for the metal plates 3 and the heat exchange channel 7. The metal ribs 6 are used to transfer the heat on the metal plates 3 to the heat exchange tube 5 to meet the requirements of efficient heat exchange.

[0051] Furthermore, a transition plate 11 is fixedly connected to the side of the metal rib plate 6 away from the through hole. The transition plate 11 penetrates the isolation plate 9. The transition plate 11 is integrally formed with the metal plate 3. The transition plate 11 does not contact the connecting plate 10.

[0052] By passing the metal rib 6 through the isolation plate 9 and embedding the transition plate 11 inside the isolation plate 9, the metal rib 6 and the metal plate 3 are integrally formed and fixed. It can be understood that the transition plate 11, the metal rib 6, and the metal plate 3 are integrally formed from the same material. By extending the connecting plate 10 into the gap between the metal plates 3, the connecting plate 10 can not only fix the centrally slotted isolation plate 9 to the metal plate 3, but also naturally form the protrusion of the isolation plate 9 into the first solid heat storage material 2. Through the heat storage characteristics of the isolation plate 9 itself, the heat transfer function of the heat exchange channel 7 is satisfied.

[0053] Furthermore, the first solid thermal storage material 2 is an inorganic salt and / or a porous matrix material.

[0054] Specifically, inorganic salts or porous matrix materials can be used alone, or inorganic salts and porous matrix materials can be used in combination to store heat in the heat storage box 1. The inorganic salts can be one or more of carbonates and nitrates, while the porous matrix materials are mainly honeycomb ceramic heat storage bricks.

[0055] Furthermore, the second solid thermal storage material 4 is an alloy phase change thermal storage material.

[0056] Commonly, magnesium-aluminum alloy is used as the second solid heat storage material 4 to fill the metal plate 3 for heat storage. The good thermal conductivity of the metal plate 3 is utilized to improve the heat exchange efficiency between the metal fins 6 and the heat exchange tubes 5.

[0057] Furthermore, the bottom of the heat storage box 1 is fixedly connected to the four sides of the column 12, the bottom surface of the heat storage box 1 is fixedly connected to the center of the bottom surface of the heat storage box 1, the top surface of the heat storage box 1 is fixedly connected to the center of the top surface of the heat storage box 1, and the two ends of the heat exchange tube 5 are respectively connected to the first connecting seat 13 and the second connecting seat 14.

[0058] The first connecting seat 13 and the second connecting seat 14 are respectively connected to both ends of the heat exchange tube 5. The heat storage box 1 is raised by the column 12, leaving space between the heat storage box 1 and the ground, so that the first connecting seat 13 can be placed at the bottom of the heat storage box 1. In addition, both the first connecting seat 13 and the second connecting seat 14 are made of heat insulation materials, such as common glass wool or foam insulation materials, to insulate both ends of the heat exchange tube 5 and avoid waste of the heat transferred by the exchange.

[0059] Furthermore, it also includes:

[0060] Fan 15 is installed on one side of heat storage box 1, and the air outlet of fan 15 is connected to the first connecting seat 13 through connecting pipe 16.

[0061] Steam generator 17 is located on the other side of heat storage tank 1. Second connecting seat 14 is connected to steam generator 17 through guide pipe 18. Guide pipe 18 is used to transport heat exchange medium. Steam generator 17 has a cold air port and a steam port. The cold air port is connected to the air inlet of fan 15 through conveying pipe 20.

[0062] The fan 15 and connecting pipe are connected to the first connecting seat 13, which in turn is connected to the heat exchange pipe 5. This provides power for the transport of the heat exchange medium, allowing it to pass through the heat exchange pipe 5 in the direction of heat release. The heat exchange pipe 5, together with several metal fins 6, heats the heat exchange medium, causing the high-temperature medium to flow out from the second connecting seat 14 and enter the steam generator 17 through the guide pipe 18. The circulating water in the steam generator 17 generates high-temperature steam, which is released from the steam outlet to utilize the heat of subsequent equipment. After releasing the heat, the heat exchange medium exits through the cold air outlet and is transported back to the fan 15 and re-enters the first connecting seat 13 via the conveying pipe 20. This process of the heat exchange medium passing through the heat exchange pipe 5 is repeated to achieve cyclic heat release.

[0063] Furthermore, a high-voltage terminal block 19 is provided on one side of the outer wall of the heat storage box 1. The high-voltage terminal block 19 is used to connect to the heating element for power supply.

[0064] This technical solution employs an electric thermal storage structure. By utilizing green new energy sources such as solar and wind power, the high-voltage terminal block 19 is energized. The high-voltage terminal block 19 is energized and connected to the heating element, thereby storing heat from the first solid thermal storage material 2 and the second solid thermal storage material 4 within the thermal storage box 1.

[0065] The present invention also provides the working principle of a heat exchange device for a thermal storage system:

[0066] By collecting environmentally friendly new energy sources to power the high-voltage terminal block 19 on the heat storage box 1, the heat storage box 1 is electrically heated. The first solid heat storage material 2 and the second solid heat storage material 4 are used to store heat. The heat exchange air is transported to the heat exchange tube 5 through the fan 15 and the connecting pipe 16. The gas moves from the bottom to the top of the heat storage box 1 along the heat exchange tube 5. As the gas moves, the first solid heat storage material 2 and the second solid heat storage material 4 release heat through the metal plate 3 and the metal rib 6, thereby heating the gas in the heat exchange tube 5. Then, the high-temperature gas is introduced into the steam generator 17 through the second connecting seat 14 and the guide pipe 18. The steam generator 17 generates high-temperature steam to release and utilize the heat. After releasing the heat, the gas is returned to the fan 15 and sent back into the heat storage box 1 to achieve cyclic heat exchange.

[0067] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0068] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A heat exchange device for a thermal storage system, characterized in that, include: The heat storage box (1) is filled with a first solid heat storage material (2); A metal plate (3) is embedded in the first solid heat storage material (2). Several metal plates (3) are distributed at equal intervals along the vertical direction. The metal plate (3) is filled with a second solid heat storage material (4). The heat exchange tube (5) runs vertically through both ends of the heat storage box (1). The first solid heat storage material (2) defines a heat exchange channel (7) in the vertical direction. The metal plate (3) and the heat exchange channel (7) overlap in an integrally formed metal rib (6). The metal rib (6) has a through hole in the center, and the heat exchange tube (5) passes through the through hole. Along the heat release direction, the diameter of the heat exchange tube (5) and the diameter of the through hole gradually decrease; Also includes: The heat exchange channel (7) is a square structure with four isolation plates (9) distributed around the inner wall of the heat exchange channel (7). Among them, the heat exchange channel (7) extends vertically from the adjacent sides of the two adjacent isolation plates (9), and the part of the isolation plate (9) that extends into the first solid heat storage material (2) is integrally formed with a connecting plate (10). The connecting plate (10) is arranged between the two adjacent metal plates (3), and the two adjacent connecting plates (10) are fixedly connected.

2. The heat exchange device for a thermal storage system according to claim 1, characterized in that: The metal rib (6) is projected vertically toward the heat exchange tube (5) to define a heat exchange zone on the outer wall of the heat exchange tube (5). A plurality of heat exchange holes (8) are provided in the heat exchange zone, and the heat exchange holes (8) penetrate the heat exchange tube (5).

3. The heat exchange device for a thermal storage system according to claim 1, characterized in that: A gap is provided between the outer wall of the heat exchange tube (5) and the inner wall of the adjacent through hole, and the planar area of ​​the metal rib (6) gradually increases along the heat release direction so that the gap remains constant.

4. The heat exchange device for a thermal storage system according to claim 1, characterized in that: A transition plate (11) is fixed to the side of the metal rib (6) away from the through hole. The transition plate (11) penetrates the isolation plate (9). The transition plate (11) is integrally formed with the metal plate (3). The transition plate (11) does not contact the connecting plate (10).

5. The heat exchange device for a thermal storage system according to claim 1, characterized in that: The heat storage box (1) has columns (12) fixed around its bottom. The center of the bottom surface of the heat storage box (1) is fixed with a first connecting seat (13). The center of the top surface of the heat storage box (1) is fixed with a second connecting seat (14). The two ends of the heat exchange tube (5) are respectively connected to the first connecting seat (13) and the second connecting seat (14).

6. The heat exchange device for a thermal storage system according to claim 5, characterized in that, Also includes: A fan (15) is installed on one side of the heat storage box (1), and the air outlet of the fan (15) is connected to the first connecting seat (13) through a connecting pipe (16). A steam generator (17) is located on the other side of the heat storage box (1). The second connecting seat (14) is connected to the steam generator (17) through a guide pipe (18). The guide pipe (18) is used to transport the heat exchange medium. The steam generator (17) has a cold air port and a steam port. The cold air port is connected to the air inlet of the fan (15) through a conveying pipe (20).

7. The heat exchange device for a thermal storage system according to claim 1, characterized in that: A high-voltage terminal block (19) is provided on one side of the outer wall of the heat storage box (1), and the high-voltage terminal block (19) is used to connect to the heating element.

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