An adjustable solid heat storage device

Abstract

The application discloses an adjustable solid heat storage device, which comprises a heat storage tank, a heat exchange structure, solid heat storage particles and a pressing plate. The heat storage tank has a fluid cavity and is provided with an inlet and an outlet connected with the fluid cavity. The heat exchange structure is arranged in the fluid cavity and has a containing cavity. The heat exchange structure is provided with a flow guide channel connected with the containing cavity and the fluid cavity. The heat exchange structure is further provided with a communication port connected with the containing cavity. The solid heat storage particles are arranged in the containing cavity. The pressing plate is installed on the heat exchange structure and covers the communication port. The pressing plate can move along the vertical direction to adjust the distance between the pressing plate and the bottom wall of the containing cavity and to flatten the solid heat storage particles at the upper end of the containing cavity. The upper surface of the solid heat storage particles can be flattened by the pressing plate, and the pressing plate can be pressed on the upper surface of the solid heat storage particles to eliminate the air channel, thereby greatly reducing the heat loss caused by the fluid escaping through the air channel. The storage amount of the solid heat storage particles can be adjusted according to actual needs, and the device has good practicability.

Description

Technical Field

[0001] This invention relates to the field of thermal energy storage technology, and more specifically to an adjustable solid thermal energy storage device. Background Technology

[0002] Solid particle thermal energy storage is a sensible heat storage technology. The principle is the same as molten salt thermal energy storage. It uses an energy source to heat low-temperature particles to increase their temperature, converting the energy into high-temperature particles for sensible heat storage. When energy needs to be released, the stored high-temperature particles exchange heat with the heat-using medium, thereby releasing the stored energy.

[0003] For example, patent CN110701937A discloses a heat storage device and a method for charging and releasing heat. It places granular rocks between two baffles in a tank and heats the rocks by natural convection after the heated heat exchange medium rises. The heat exchange medium transfers heat through the gaps between the rocks, which greatly simplifies the structure of the heat storage device and eliminates the need for additional air ducts and fans.

[0004] However, due to the settling of solid thermal storage particles under gravity or vibration, air channels can easily form between the baffle on the upper side of the device and the upper surface of the solid thermal storage particle layer, which in turn causes most of the heat to escape through the air bypass channel. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose an adjustable solid thermal storage device to solve the technical problem in the prior art where the solid thermal storage particles settle under gravity or vibration, causing air channels to easily appear between the baffle on the upper side of the device and the upper surface of the solid thermal storage particle layer, resulting in most of the heat escaping through the air bypass channel.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] This invention provides an adjustable solid thermal energy storage device, comprising:

[0008] A thermal storage tank has a fluid cavity and is provided with an inlet and an outlet communicating with the fluid cavity;

[0009] A heat exchange structure is placed inside the fluid cavity and has a receiving cavity, and is provided with a flow guide channel connecting the receiving cavity and the fluid cavity, and is also provided with a communication port connecting the receiving cavity on its upper side;

[0010] Solid heat storage particles are placed inside the accommodating cavity; and

[0011] A pressure plate is installed on the heat exchange structure and covers the communication port. It can move vertically to adjust the distance between itself and the bottom wall of the accommodating cavity and to flatten the solid heat storage particles located at the upper end of the accommodating cavity.

[0012] In some embodiments, the heat exchange structure includes two air distribution plates, which are spaced apart along the arrangement direction of the inlet and the outlet, and their peripheries are respectively connected to the inner wall of the fluid cavity to form the accommodating cavity together with the inner wall of the fluid cavity.

[0013] The holes in the air distribution plate form the flow guiding channel, and the connecting port is located at the upper end of the two air distribution plates.

[0014] In some embodiments, the inlet and the outlet are located on opposite side walls in the horizontal direction of the thermal storage tank;

[0015] The flow guiding channel extends along the layout direction of the inlet and the outlet.

[0016] In some embodiments, the upper side of the heat storage tank is provided with an opening corresponding to the communication port, and the opening is connected to the communication port;

[0017] The adjustable solid thermal storage device also includes a cover plate, which is movably installed on the thermal storage tank and covers the opening so as to be able to close and open the opening.

[0018] In some embodiments, the cover plate is provided with adjusting screw holes in the vertical direction;

[0019] The adjustable solid thermal storage device further includes an adjusting screw, one end of which is screwed into the adjusting screw hole and rotatably connected to the pressure plate around its axis, so as to drive the pressure plate to move in the vertical direction when rotating.

[0020] In some embodiments, a plurality of adjustment screw holes are provided, and the plurality of adjustment screw holes are spaced apart along the circumference of the cover plate;

[0021] The adjustment screws are provided in multiple ways corresponding to the adjustment screw holes. One end of each adjustment screw is screwed into the corresponding adjustment screw hole and is rotatably connected to the pressure plate around its axis.

[0022] In some embodiments, a mounting plate is provided at the periphery of the opening in a direction away from the air distribution plate;

[0023] The cover plate is movably installed at the end of the mounting plate away from the air distribution plate, and the pressure plate can move from the communication port to a position close to the cover plate.

[0024] In some embodiments, the adjustable solid thermal storage device further includes a plowshare, which is mounted on the side of the pressure plate near the receiving cavity and is movable horizontally relative to the pressure plate.

[0025] In some embodiments, the plowshare is provided in multiple sets, and the multiple sets of plowshares are arranged at intervals on the side of the pressure plate near the receiving cavity.

[0026] In some embodiments, the heat storage tank includes an outer shell, an inner insulation shell, two fluid pipes, and multiple support plates. The inner insulation shell is placed inside the outer shell and spaced apart from it. The multiple support plates are placed in the gap between the inner insulation shell and the outer shell and are spaced apart. The two ends of each support plate are respectively connected to the outer shell and the inner insulation shell.

[0027] The inner cavity of the inner insulation shell constitutes the fluid cavity, and the two fluid pipes are respectively connected to the outside and the inner cavity of the inner insulation shell. The inlet and the outlet are respectively formed at the ends of the two fluid pipes.

[0028] Compared with existing technologies, the adjustable solid thermal storage device provided by this invention allows for the following adjustment: when solid thermal storage particles are placed into the receiving cavity through the connecting port, they settle under gravity or vibration, causing unevenness in the upper particle layer and creating air channels. The device can then drive a pressure plate to move closer to the bottom wall of the receiving cavity, flattening the upper surface of the solid thermal storage particles and pressing the pressure plate firmly against the particles, thus eliminating air channels and significantly reducing heat loss caused by fluid escaping through them. Furthermore, the storage space for the solid thermal storage particles can be adjusted by changing the distance between the pressure plate and the bottom wall of the receiving cavity, allowing for adjustment of the storage volume according to actual needs and improving practicality. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view of the adjustable solid thermal energy storage device (with the upper surface of the solid thermal energy storage particles not being compressed) provided in an embodiment of the present invention.

[0030] Figure 2 yes Figure 1 A schematic diagram of the structure of the adjustable solid thermal energy storage device (not showing solid thermal energy storage particles).

[0031] Figure 3 yes Figure 2 Schematic diagram of the structure of the two air distribution panels;

[0032] Figure 4 yes Figure 2 A partial schematic diagram of a medium-sized adjustable solid thermal energy storage device;

[0033] Figure 5 yes Figure 4 Enlarged schematic diagram of the middle cover plate, pressure plate and plow head;

[0034] Figure 6 yes Figure 1 A schematic diagram of the structure of the medium-sized thermal storage tank.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Heat storage tank; 1a. Fluid cavity; 1b. Inlet; 1c. Outlet; 1d. Opening; 11. Mounting plate; 12. Outer shell; 13. Inner insulation shell; 14. Fluid pipe; 15. Support plate; 2. Heat exchange structure; 2a. Containing cavity; 2b. Flow guide channel; 2c. Connecting port; 21. Air distribution plate; 21a. Channel; 3. Solid heat storage particles; 4. Pressure plate; 5. Cover plate; 5a. Adjusting screw hole; 6. Adjusting screw; 7. Plowshare; 8. Air passage. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] To address the technical problem in existing technologies where solid thermal storage particles settle under gravity or vibration, causing air channels to easily form between the upper baffle of the device and the upper surface of the solid thermal storage particle layer, resulting in the escape of most of the heat through the air bypass channel, this invention provides an adjustable solid thermal storage device. This device uses a pressure plate to flatten the upper surface of the solid thermal storage particles and press the pressure plate tightly against the upper surface of the solid thermal storage particles, thereby eliminating air channels and greatly reducing heat loss caused by fluid escaping through the air channels. Furthermore, it allows for flexible adjustment of the amount of solid thermal storage particles stored, making it highly practical.

[0039] Please see Figure 1 and Figure 2 , Figure 1 and Figure 2 This is a schematic diagram of an adjustable solid thermal storage device according to an embodiment of the present invention. The adjustable solid thermal storage device includes a thermal storage tank 1, a heat exchange structure 2, solid thermal storage particles 3, and a pressure plate 4. The thermal storage tank 1 has a fluid cavity 1a and is provided with an inlet 1b and an outlet 1c communicating with the fluid cavity 1a. The heat exchange structure 2 is placed inside the fluid cavity 1a and has a receiving cavity 2a. It is provided with a guide channel 2b communicating with the receiving cavity 2a and the fluid cavity 1a, and its upper side is also provided with a connecting port 2c communicating with the receiving cavity 2a. The solid thermal storage particles 3 are placed inside the receiving cavity 2a. The pressure plate 4 is installed on the heat exchange structure 2 and covers the connecting port 2c. It can move in the vertical direction to adjust the distance between itself and the bottom wall of the receiving cavity 2a and to flatten the solid thermal storage particles 3 located at the upper end of the receiving cavity 2a.

[0040] In the adjustable solid thermal storage device provided by this invention, when the solid thermal storage particles 3 are placed into the receiving cavity 2a through the connecting port 2c, they settle under gravity or vibration, causing the upper particle layer to become uneven and creating air channels 8. The device can then drive the pressure plate 4 to move closer to the bottom wall of the receiving cavity 2a. The pressure plate 4 flattens the upper surface of the solid thermal storage particles 3 and presses it firmly against the upper surface of the solid thermal storage particles 3, thus eliminating the air channels 8 and greatly reducing heat loss caused by fluid escaping through the air channels 8. Simultaneously, the storage space of the solid thermal storage particles 3 can be adjusted by changing the distance between the pressure plate 4 and the bottom wall of the receiving cavity 2a, thereby allowing adjustment of the storage amount of the solid thermal storage particles 3 according to actual needs and improving practicality.

[0041] In one embodiment, please refer to Figure 2 and Figure 3 The heat exchange structure 2 includes two air distribution plates 21, which are spaced apart along the arrangement direction of the inlet 1b and the outlet 1c, and their peripheries are respectively connected to the inner wall of the fluid cavity 1a to form a receiving cavity 2a together with the inner wall of the fluid cavity 1a; wherein, the channels 21a of the air distribution plates 21 form a flow guiding channel 2b, and the connecting port 2c is located at the upper end of the two air distribution plates 21.

[0042] In this embodiment, two air distribution plates 21 are fitted with the inner wall of the fluid cavity 1a to create a accommodating cavity 2a for placing the solid heat storage particles 3. This saves material required for the tank, reduces costs, and makes the overall structure relatively compact. Furthermore, the air distribution plates 21 can uniformly exchange heat between the fluid and the solid heat storage material.

[0043] In one embodiment, the inlet 1b and the outlet 1c are located on opposite side walls of the thermal storage tank 1 in the horizontal direction; the flow channel 2b extends along the layout direction of the inlet 1b and the outlet 1c.

[0044] In this embodiment, the inlet 1b and the outlet 1c are located on opposite sides of the heat storage tank 1 in the horizontal direction. At the same time, the guide channel 2b extends along the arrangement direction of the inlet 1b and the outlet 1c, and the connecting port 2c is located at the upper end of the two air distribution plates 21. In this way, the flow of heat exchange fluid is not affected by the movement of the pressure plate 4, and the heat exchange fluid can effectively exchange heat with the solid heat storage particles 3.

[0045] In one embodiment, please refer to Figure 4 The upper side of the heat storage tank 1 is provided with an opening 1d corresponding to the communication port 2c, and the opening 1d is connected to the communication port 2c; the adjustable solid heat storage device also includes a cover plate 5, which is movably installed on the heat storage tank 1 and covers the opening 1d so as to be able to close and open the opening 1d.

[0046] In this embodiment, an opening 1d is provided on the upper side of the heat storage tank 1, and a cover plate 5 is correspondingly provided to allow the opening 1d to be opened and closed, thereby enabling the solid heat storage particles 3 to be placed into the accommodating cavity 2a through the opening 1d and the connecting port 2c, improving convenience. It should be noted that, in one embodiment, one end of the cover plate 5 is hinged to the heat storage tank 1, so that the opening 1d can be opened or closed during the rotation of the cover plate 5, making operation convenient.

[0047] In one embodiment, please refer to Figure 4 and Figure 5 The cover plate 5 is provided with an adjustment screw hole 5a in the vertical direction; the adjustable solid thermal storage device also includes an adjustment screw 6, one end of which is screwed into the adjustment screw hole 5a and rotatably connected to the pressure plate 4 around its axis, so as to drive the pressure plate 4 to move in the vertical direction when rotating.

[0048] In this embodiment, when the adjusting screw 6 is rotated, the length of the adjusting screw 6 extending from the adjusting screw hole 5a into the accommodating cavity 2a can be adjusted accordingly, thereby enabling the pressure plate 4 to move in the vertical direction, so that the distance between the pressure plate 4 and the bottom wall of the accommodating cavity 2a can be flexibly adjusted. The operation is simple and convenient, and the structure is simple and the cost is low.

[0049] In one embodiment, multiple adjusting screw holes 5a are provided, and the multiple adjusting screw holes 5a are spaced apart along the circumference of the cover plate 5; multiple adjusting screws 6 are provided corresponding to the adjusting screw holes 5a, and one end of each adjusting screw 6 is screwed into the corresponding adjusting screw hole 5a and rotated around its axis to be connected to the pressure plate 4.

[0050] In this embodiment, multiple sets of adjusting screw holes 5a and adjusting screws 6 are respectively provided to stably drive the pressure plate 4 to move in the vertical direction. It should be noted that, in the example in the attached drawings, each adjusting screw 6 is also provided with an operating handle at the end away from the receiving cavity 2a, so that the operator can rotate the adjusting screw 6 and improve the convenience of operation.

[0051] In one embodiment, please refer to Figure 6 An installation plate 11 is provided on the periphery of the opening 1d in a direction away from the air distribution plate 21; a cover plate 5 is movably installed on the end of the installation plate 11 away from the air distribution plate 21, and a pressure plate 4 can move from the connecting port 2c to a position close to the cover plate 5.

[0052] In this embodiment, an installation plate 11 should be provided around the periphery of the opening 1d, and the pressure plate 4 can move from the connecting port 2c to a position close to the cover plate 5. In this way, the solid heat storage particles 3 can be filled to cover the air distribution plate 21 and partially filled in the installation plate 11. Then, the pressure plate 4 flattens the upper surface of the solid heat storage particles 3 located in the installation plate 11, so that the heat exchange fluid passing through the holes 21a of the air distribution plate 21 can effectively exchange heat with the solid heat storage particles 3, thereby improving the heat exchange capacity.

[0053] In one embodiment, the adjustable solid thermal storage device further includes a plowshare 7, which is installed on the side of the pressure plate 4 near the receiving cavity 2a and is movable in the horizontal direction relative to the pressure plate 4.

[0054] In this embodiment, the pressure plate 4 can be moved to a position where there is a certain gap between it and the upper surface of the solid heat storage particle 3. At this time, the plow head 7 just contacts the solid heat storage particle 3. Then, the plow head 7 is moved horizontally to plow the upper surface of the solid heat storage particle 3. Then, the pressure plate 4 is pressed down so that the pressure plate 4 is close to the upper surface of the solid heat storage particle 3, which improves convenience.

[0055] In one embodiment, the plowshare 7 is provided in multiple sets, and the multiple sets of plowshare 7 are arranged at intervals on the side of the pressure plate 4 near the receiving cavity 2a.

[0056] In this embodiment, multiple sets of plowheads 7 are provided to improve the plowing efficiency on the upper surface of the solid heat storage particles 3. Specifically, in the example in the attached drawings, two sets of plowheads 7 are provided. Each plowhead 7 is configured to be electrically driven, so that the plowhead 7 is driven by a motor to move in the horizontal direction, thus forming an electric plowing device.

[0057] It should be noted that, due to the large difference in the coefficient of thermal expansion between the heat storage tank 1 and the solid heat storage material, the heat storage tank 1 will undergo cumulative plastic deformation under the thermal ratchet effect during the frequent charging and releasing of the solid heat storage material, which may lead to the rupture of the heat storage tank 1.

[0058] Therefore, in one embodiment, the heat storage tank 1 includes an outer shell 12, an inner insulation shell 13, two fluid pipes 14, and multiple support plates 15. The inner insulation shell 13 is placed in the inner cavity of the outer shell 12 and is spaced apart from the outer shell 12. The multiple support plates 15 are placed in the gap between the inner insulation shell 13 and the outer shell 12 and are spaced apart. The two ends of each support plate 15 are respectively connected to the outer shell 12 and the inner insulation shell 13. The inner cavity of the inner insulation shell 13 forms a fluid cavity 1a. The two fluid pipes 14 are respectively connected to the outside and the inner cavity of the inner insulation shell 13. The inlet 1b and the outlet 1c are respectively formed at the ends of the two fluid pipes 14.

[0059] In this embodiment, by setting an inner insulation shell 13 and spacing the outer shell 12 from the inner insulation shell 13, the heat transfer capacity between the solid heat storage particles 3 and the outer shell 12 is reduced. That is, the inner insulation shell 13 is made of insulation material, while the outer shell 12 is made of steel. This reduces the amount and weight of steel plates used, and solves the problem of cracking or deformation of the contact tank caused by the thermal ratchet effect. Furthermore, leaving a certain gap between the outer shell 12 and the insulation shell provides a buffering effect. It should be noted that the cover plate 5 also adopts a structure of an outer shell, an inner insulation shell, and a support plate.

[0060] To better understand this invention, the following is combined with... Figures 1 to 6The technical solution of the present invention will be described in detail below:

[0061] Solid heat storage particles 3 are loaded into the accommodating cavity 2a through the opening 1d and the connecting port 2c. As the particles accumulate, the upper surface of the particles gradually approaches the upper end of the air distribution plate 21. After the height of the particles exceeds the height of the air distribution plate 21, the height of the pressure plate 4 is adjusted, and the electric plowing device is started at the same time to gradually flatten the surface of the particles. At this time, the height of the pressure plate 4 is readjusted to press the upper surface of the particles and eliminate the air passage 8.

[0062] Heat charging process: After the solid heat storage particles 3 are loaded, the hot fluid enters the fluid cavity 1a through the inlet 1b, and is about to enter the accommodating cavity 2a through the hole 21a of the air distribution plate 21. After transferring heat to the solid heat storage material in the accommodating cavity 2a, it enters the fluid cavity 1a again through the hole 21a of another air distribution plate 21, and finally flows out through the outlet 1c. This is the heat charging process.

[0063] Heat release process: The cold fluid enters the fluid cavity 1a through the inlet 1b, and then enters the accommodating cavity 2a through the hole 21a of the air distribution plate 21, so that the cold fluid mixes with the solid heat storage particles 3 in the accommodating cavity 2a. After the cold fluid exchanges heat with the hot particles, the fluid that has acquired heat enters the fluid cavity 1a through the hole 21a of another air distribution plate 21, and finally flows out through the outlet 1c. This is the heat release process.

[0064] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An adjustable solid thermal energy storage device, characterized in that, include: A thermal storage tank has a fluid cavity and is provided with an inlet and an outlet communicating with the fluid cavity; A heat exchange structure is placed inside the fluid cavity and has a receiving cavity, and is provided with a flow guide channel connecting the receiving cavity and the fluid cavity, and is also provided with a communication port connecting the receiving cavity on its upper side; Solid heat storage particles are placed inside the accommodating cavity; and A pressure plate is installed on the heat exchange structure and covers the communication port. It can move vertically to adjust the distance between itself and the bottom wall of the accommodating cavity and to flatten the solid heat storage particles located at the upper end of the accommodating cavity.

2. The adjustable solid thermal energy storage device according to claim 1, characterized in that, The heat exchange structure includes two air distribution plates, which are spaced apart along the arrangement direction of the inlet and the outlet, and their peripheries are respectively connected to the inner wall of the fluid cavity to form the accommodating cavity together with the inner wall of the fluid cavity. The holes in the air distribution plate form the flow guiding channel, and the connecting port is located at the upper end of the two air distribution plates.

3. The adjustable solid thermal energy storage device according to claim 2, characterized in that, The inlet and the outlet are located on opposite side walls in the horizontal direction of the thermal storage tank; The flow guiding channel extends along the layout direction of the inlet and the outlet.

4. The adjustable solid thermal energy storage device according to claim 2, characterized in that, The upper side of the heat storage tank is provided with an opening corresponding to the communication port, and the opening is connected to the communication port; The adjustable solid thermal storage device also includes a cover plate, which is movably installed on the thermal storage tank and covers the opening so as to be able to close and open the opening.

5. The adjustable solid thermal energy storage device according to claim 4, characterized in that, The cover plate is provided with adjusting screw holes along the vertical direction; The adjustable solid thermal storage device further includes an adjusting screw, one end of which is screwed into the adjusting screw hole and rotatably connected to the pressure plate around its axis, so as to drive the pressure plate to move in the vertical direction when rotating.

6. The adjustable solid thermal energy storage device according to claim 5, characterized in that, The adjustment screw holes are provided in multiple ways, and the multiple adjustment screw holes are spaced apart along the circumference of the cover plate; The adjustment screws are provided in multiple ways corresponding to the adjustment screw holes. One end of each adjustment screw is screwed into the corresponding adjustment screw hole and is rotatably connected to the pressure plate around its axis.

7. The adjustable solid thermal energy storage device according to claim 4, characterized in that, A mounting plate is provided around the periphery of the opening in a direction away from the air distribution plate; The cover plate is movably installed at the end of the mounting plate away from the air distribution plate, and the pressure plate can move from the communication port to a position close to the cover plate.

8. The adjustable solid thermal energy storage device according to claim 1, characterized in that, The adjustable solid thermal storage device also includes a plowshare, which is installed on the side of the pressure plate near the accommodating cavity and is capable of moving horizontally relative to the pressure plate.

9. The adjustable solid thermal energy storage device according to claim 8, characterized in that, The plowshare is provided in multiple sets, and the multiple sets of plowshares are arranged at intervals on the side of the pressure plate near the receiving cavity.

10. The adjustable solid thermal energy storage device according to claim 1, characterized in that, The heat storage tank includes an outer shell, an inner insulation shell, two fluid pipes, and multiple support plates. The inner insulation shell is placed inside the outer shell and spaced apart from it. The multiple support plates are placed in the gap between the inner insulation shell and the outer shell and are spaced apart. The two ends of each support plate are respectively connected to the outer shell and the inner insulation shell. The inner cavity of the inner insulation shell constitutes the fluid cavity, and the two fluid pipes are respectively connected to the outside and the inner cavity of the inner insulation shell. The inlet and the outlet are respectively formed at the ends of the two fluid pipes.

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