Solid electric heat storage device capable of improving heat storage volume of heat storage body under working condition of storing and discharging simultaneously

Abstract

The invention discloses a solid electric heat storage device capable of improving the heat storage volume of a heat storage body under the working condition of storing and discharging simultaneously, and relates to the technical field of heat storage. The problem that an existing rectangular heat accumulator structure is poor in performance under the working condition of storing and discharging at the same time is solved. The device comprises a heat accumulator, a heat preservation shell and an equipment base, the heat accumulator and the heat preservation shell are both arranged on the upper end face of the equipment base, the heat accumulator is sleeved with the heat preservation shell, an air cavity is formed between the heat preservation shell and the heat accumulator, and an air inlet is formed in the middle of the upper end face of the heat preservation shell and communicates with the air cavity through the heat accumulator; a pressure equalizing cavity is formed in the equipment base and communicates with the air cavity, and an air outlet is formed in the middle of the lower end face of the equipment base and communicates with the pressure equalizing cavity. The invention is used for electric heat storage.

Description

Technical Field

[0001] This invention relates to the field of thermal storage technology, specifically to a solid-state electric thermal storage device that can increase the thermal storage volume of the thermal storage body under simultaneous storage and release conditions. Background Technology

[0002] The process flow of solid-state electric thermal energy storage is as follows: heating → solid-state thermal energy storage → heat extraction → heat exchange → heating terminal. During off-peak electricity hours or periods of renewable energy curtailment, the electric heating element converts electrical energy into heat energy, which is absorbed and stored by the solid thermal energy storage material. When heating is needed, the heat is carried out by equipment such as fans, and then exchanged with media such as water and thermal oil through heat exchangers to provide heat energy to users in the form of hot water, hot air, etc.

[0003] It has the advantages of high heat storage temperature, small space occupation, fast heat storage and release efficiency, simple and safe control process, stable heat storage performance, no corrosion and pollution, and high equipment operation safety factor, and is widely used in district heating, industrial heat use and other fields.

[0004] In the structure of a traditional rectangular heat storage body, the front section of the heat exchanger cannot form a high-temperature environment due to cold air interference, so heat cannot be stored in the heat storage body by radiation. Therefore, the structure of a traditional rectangular heat storage body performs poorly under the condition of simultaneous storage and release. Summary of the Invention

[0005] In order to solve the problem that the existing rectangular heat storage body structure does not perform well under the condition of simultaneous storage and release, the present invention proposes a solid electric heat storage device that can improve the heat storage volume of the heat storage body under the condition of simultaneous storage and release.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] A solid-state electric thermal energy storage device that can increase the thermal energy storage volume of the thermal energy storage body under simultaneous storage and release conditions includes a thermal energy storage body, an insulating shell, and an equipment base. The thermal energy storage body and the insulating shell are both located on the upper surface of the equipment base. The insulating shell is fitted over the outer side of the thermal energy storage body. An air cavity is provided between the insulating shell and the thermal energy storage body. An air inlet is provided in the middle of the upper surface of the insulating shell. The air inlet is connected to the air cavity through the thermal energy storage body. A pressure equalization chamber is provided inside the equipment base. The pressure equalization chamber is connected to the air cavity. An air outlet is provided in the middle of the lower surface of the equipment base. The air outlet is connected to the pressure equalization chamber.

[0008] Furthermore, the heat storage body and the insulation shell are arranged coaxially.

[0009] Furthermore, the shape of the heat-insulating outer shell is a cylinder that is closed at the top and open at the bottom.

[0010] Furthermore, the base of the equipment is cylindrical in shape, and the pressure equalization chamber is a cylindrical cavity.

[0011] Furthermore, multiple support columns are evenly distributed along the circumferential direction within the pressure equalization chamber, with each support column positioned along the axial direction.

[0012] Furthermore, the heat storage body is cylindrical in shape.

[0013] Furthermore, the heat storage body has a through hole in the middle along the axial direction, and multiple slot groups are arranged in parallel along the axial direction on the side wall of the heat storage body. Each slot group includes slots evenly distributed along the circumferential direction. Each slot is arranged in the radial direction. The outer end of the slot is connected to the air cavity, and the inner end of the slot is connected to the through hole. The through hole is connected to the air inlet.

[0014] Furthermore, an electric heating wire is installed inside the slot.

[0015] Furthermore, the equalizing chamber and the air chamber are connected by multiple wind tunnels.

[0016] Furthermore, multiple wind tunnels are evenly distributed along the circumference on the upper surface of the equipment base. The wind tunnels are arc-shaped through slots, with the upper end of the wind tunnel connected to the air cavity and the lower end of the wind tunnel connected to the pressure equalization cavity.

[0017] The beneficial effects of this invention compared to the prior art are:

[0018] This invention provides a solid-state electric thermal storage device that can increase the thermal storage volume of the thermal storage body under simultaneous storage and release conditions. This invention changes the traditional construction structure of the thermal storage body, forming a cylindrical sleeve structure, thereby increasing the thermal volume of the thermal storage body and reducing construction costs. In this invention, the adverse effects of simultaneous storage and release conditions are offset by the change in the area of ​​the inner and outer rings of the sleeve. Specifically, the thermal storage structure on the windward side of the inner ring is compactly arranged with fewer bricks. According to the thermal storage formula Q=cmΔt, since the heat generated by the heating wire Q and the thermal capacity c of the thermal storage body remain constant, reducing the mass m of the thermal storage body increases the temperature rise Δt at the front end, avoiding the problem of insufficient heat storage at the front end under simultaneous storage and release conditions. For the high-temperature zone of the outer ring, the increased radial brick quantity gives the rear end a greater thermal storage capacity, allowing it to receive more heat from its own heating wire and the windward side. This design helps avoid the problem of uneven temperature distribution between the front and rear ends of the thermal storage body under simultaneous storage and release conditions, and the cylindrical structure is also more beneficial for heat preservation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a front sectional view of the overall structure of the present invention;

[0021] Figure 3 This is a top sectional view of the overall structure of the present invention. Detailed Implementation

[0022] To make the technical problems solved, the technical solutions, and the beneficial effects of the present 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 only for explaining the invention and are not intended to limit the invention.

[0023] Specific implementation method one: Combining Figures 1 to 3 This embodiment describes a solid-state electric thermal energy storage device that can increase the thermal energy storage volume of a thermal energy storage body under simultaneous storage and release conditions. The device includes a thermal energy storage body 3, an insulating shell 5, and a base 6. Both the thermal energy storage body 3 and the insulating shell 5 are located on the upper surface of the base 6. The insulating shell 5 is fitted over the outer side of the thermal energy storage body 3. An air cavity 8 is provided between the insulating shell 5 and the thermal energy storage body 3. An air inlet 4 is located in the middle of the upper surface of the insulating shell 5, and the air inlet 4 is connected to the air cavity 8 through the thermal energy storage body 3. A pressure equalization chamber 7 is provided inside the base 6, and the pressure equalization chamber 7 is connected to the air cavity 8. An air outlet 1 is located in the middle of the lower surface of the base 6, and the air outlet 1 is connected to the pressure equalization chamber 7.

[0024] In this embodiment, the upper central area of ​​the heat storage body 3 receives air and the air exits laterally. The equipment base 6 is provided with a pressure equalization chamber 7 to improve the uniformity of air distribution within the heat storage body 3. The windward side of the heat storage body 3 is arranged inside the cylinder, while the air outlet side is arranged outside the cylinder.

[0025] Specific Implementation Method Two: Combining Figures 1 to 3 In this embodiment, the heat storage body 3 and the heat insulation shell 5 are coaxially arranged.

[0026] The undisclosed technical features in this embodiment are the same as those in Specific Embodiment 1.

[0027] Specific implementation method three: Combining Figures 1 to 3 This embodiment describes a cylindrical shape for which the heat-insulating outer shell 5 is closed at the top and open at the bottom.

[0028] The undisclosed technical features in this embodiment are the same as those in Specific Embodiment 1.

[0029] Specific implementation method four: Combination Figures 1 to 3 This embodiment describes a device with a cylindrical base 6 and a cylindrical pressure equalization chamber 7.

[0030] The undisclosed technical features in this embodiment are the same as those in Specific Embodiment 1.

[0031] Specific Implementation Method Five: Combining Figures 1 to 3 In this embodiment, multiple support columns 9 are evenly distributed along the circumferential direction inside the pressure equalization cavity 7, and each support column 9 is arranged along the axial direction.

[0032] The undisclosed technical features in this embodiment are the same as those in Specific Embodiment Four.

[0033] This design can further improve the uniformity of airflow in the equalizing chamber 7, and also enhance the overall strength of the equipment base 6 to prevent collapse.

[0034] Specific Implementation Method Six: Combination Figures 1 to 3 This embodiment describes a heat storage body 3 in a cylindrical shape.

[0035] The undisclosed technical features in this embodiment are the same as those in Specific Embodiment 1.

[0036] Specific implementation method seven: Combining Figures 1 to 3 In this embodiment, the heat storage body 3 has a through hole 31 in the middle along the axial direction, and multiple slot groups are arranged in parallel along the axial direction on the side wall of the heat storage body 4. Each slot group includes slots 32 evenly distributed along the circumferential direction. Each slot 32 is arranged in the radial direction. The outer end of the slot 32 is connected to the air cavity 8, and the inner end of the slot 32 is connected to the through hole 31. The through hole 31 is connected to the air inlet 4.

[0037] The undisclosed technical features in this embodiment are the same as those in Specific Embodiment Six.

[0038] In this embodiment, the heat storage body 3 is constructed as a cylindrical sleeve structure, with solid layers and hollow layers laid out in sequence, wherein the hollow layer has slots 32 distributed along the circumference.

[0039] Specific implementation method eight: Combination Figures 1 to 3 This embodiment describes an embodiment in which an electric heating wire is provided inside the slot 32.

[0040] The undisclosed technical features in this embodiment are the same as those in Specific Embodiment Seven.

[0041] In this embodiment, the heat storage body 3 has through slots 32 arranged around its circumference, through which the electric heating wire passes. Each slot 32 serves as a basic heat exchange unit.

[0042] Specific Implementation Method Nine: Combining Figures 1 to 3 This embodiment describes a method in which the equalizing chamber 7 and the air chamber 8 are connected by multiple air tunnels 2.

[0043] The undisclosed technical features in this embodiment are the same as those in Specific Embodiment 1.

[0044] Specific Implementation Method Ten: Combining Figures 1 to 3In this embodiment, the multiple wind tunnels 2 are evenly distributed along the circumferential direction on the upper surface of the equipment base 6. The wind tunnel 2 is an arc-shaped through groove. The upper end of the wind tunnel 2 is connected to the wind cavity 8, and the lower end of the wind tunnel 2 is connected to the pressure equalization cavity 7.

[0045] The undisclosed technical features in this embodiment are the same as those in specific embodiment nine.

[0046] Working principle

[0047] The specific structure of the present invention is as follows: Figure 2 As shown, in this invention, the heat storage body 3 is constructed as a layered, hollowed-out cylindrical sleeve structure, as follows: Figure 3 As shown, the sleeve-type heat storage body 3 has through slots 32 arranged around its circumference, through which the electric heating wire passes. Each slot 32 serves as both a basic heating unit and a basic heat release unit. When the equipment is storing heat, the electric heating wire is activated, and electrical energy is converted into heat energy and stored in the heat storage body 3.

[0048] When heating is required, cold air enters the inner ring through-hole 31 of the heat storage body 3 through the air inlet 4, and heats up by exchanging heat through the heat exchange holes (slots 32) inside the heat storage body 3. After the hot air leaves the heat storage body 3, it enters the pressure equalization chamber 7 through the wind tunnel 2, as shown in the top view. Figure 3 As shown, the equalizing chamber 7 serves to balance the air volume within the heat storage body. The hot air then leaves the heat storage device through the air outlet 1 and enters the heat exchanger to heat the heating medium, completing the entire heat release process.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A solid-state electric thermal energy storage device that can increase the thermal energy storage volume of the thermal energy storage body under simultaneous storage and release conditions, characterized in that: The device comprises a heat storage body (3), a heat preservation shell (5) and a device base (6), the heat storage body (3) and the heat preservation shell (5) are arranged on the upper end surface of the device base (6), the heat preservation shell (5) is sleeved on the outer side of the heat storage body (3), the air cavity (8) is arranged between the heat preservation shell (5) and the heat storage body (3), the middle part of the upper end surface of the heat preservation shell (5) is provided with the air inlet (4), the air inlet (4) is communicated with the air cavity (8) through the heat storage body (3), the pressure equalizing cavity (7) is arranged in the device base (6), the pressure equalizing cavity (7) is communicated with the air cavity (8), the middle part of the lower end surface of the device base (6) is provided with the air outlet (1), and the air outlet (1) is communicated with the pressure equalizing cavity (7).

2. The solid electrothermal storage device of claim 1, wherein the solid electrothermal storage device is capable of increasing the storage volume of the regenerator in the edge storage and edge discharge mode. The heat storage body (3) and the heat preservation shell (5) are coaxially arranged.

3. The solid electrothermal storage device of claim 1, wherein the solid electrothermal storage device is capable of increasing the storage volume of the regenerator in the edge storage and edge discharge mode. The heat preservation shell (5) is in the shape of a cylinder with a closed upper end and an open lower end.

4. The solid electrothermal storage device of claim 1, wherein the solid electrothermal storage device is capable of increasing the storage volume of the regenerator in the edge storage and edge discharge mode. The device base (6) is in the shape of a cylinder, and the pressure equalizing cavity (7) is a cylindrical chamber.

5. The solid electrothermal storage device of claim 4, wherein: A plurality of support columns (9) are arranged in the pressure equalizing cavity (7) in the circumferential direction, and each support column (9) is arranged in the axial direction.

6. The solid electrothermal storage device of claim 1, wherein: The heat storage body (3) is in the shape of a cylinder.

7. The solid electrothermal storage device of claim 6, wherein: A through hole (31) is arranged in the middle part of the heat storage body (3) in the axial direction, a plurality of groove groups are arranged on the side wall of the heat storage body (4) in the axial direction, each groove group comprises groove holes (32) arranged in the circumferential direction, each groove hole (32) is arranged in the radial direction, the outer end of the groove hole (32) is communicated with the air cavity (8), the inner end of the groove hole (32) is communicated with the through hole (31), and the through hole (31) is communicated with the air inlet (4).

8. The solid electrothermal storage device of claim 7, wherein: An electric heating wire is arranged in the groove hole (32).

9. The solid electrothermal storage device of claim 1, wherein: The pressure equalizing cavity (7) and the air cavity (8) are communicated through a plurality of air holes (2).

10. The solid electrothermal storage device of claim 9, wherein: The plurality of air holes (2) are arranged on the upper end surface of the device base (6) in the circumferential direction, the air hole (2) is an arc-shaped slot, the upper end of the air hole (2) is communicated with the air cavity (8), and the lower end of the air hole (2) is communicated with the pressure equalizing cavity (7).

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