A multi-scenario integrated high-efficiency heat storage ball

Abstract

This invention relates to the field of thermal energy storage technology, and in particular to a multi-scenario integrated high-efficiency thermal storage ball, comprising a shell and a thermal storage core, wherein the thermal storage core is located inside the shell; multiple spherical surfaces are integrally formed on the shell, the spherical surfaces including a first arc-shaped surface protruding outward and / or a second arc-shaped surface concave inward; the above technical solution solves the problems of insufficient heat exchange capacity and excessive thermal stress caused by thermal expansion, which makes the thermal storage ball prone to cracking.

Description

Technical Field

[0001] This invention relates to the field of thermal energy storage technology, and in particular to a thermal storage ball with integrated high-efficiency functions for multiple scenarios. Background Technology

[0002] With the introduction of dual-carbon goals, the energy industry has undergone tremendous changes, mainly in two aspects. Firstly, there's the greening of primary energy sources, significantly increasing the proportion of photovoltaic, solar thermal, and nuclear energy. Secondly, there's energy conservation and emission reduction, with many companies exploring energy-saving equipment and waste heat utilization methods. Against this backdrop, the energy storage industry is booming. The most common energy storage methods are electrical and thermal storage. Electrical storage technology is hampered by the persistently high cost of batteries. Thermal storage technology also suffers from drawbacks such as high cost and system complexity.

[0003] Thermal storage balls are common components in thermal energy storage devices. They are typically filled with phase change thermal storage materials, which absorb or release heat to achieve thermal storage. However, when these thermal storage balls are applied to other thermal storage materials in an attempt to achieve higher-quality thermal energy storage, problems arise such as insufficient heat exchange capacity and excessive thermal stress caused by thermal expansion, leading to easy breakage of the balls. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a heat storage ball with integrated high-efficiency functions for multiple scenarios, solving the problems of insufficient heat exchange capacity and excessive thermal stress caused by thermal expansion, which makes the heat storage ball prone to cracking.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this application provides a multi-scenario integrated high-efficiency heat storage ball, comprising a shell and a heat storage core, wherein the heat storage core is located inside the shell; a plurality of spherical surfaces are integrally formed on the shell, the spherical surfaces including a first arcuate surface protruding outward and / or a second arcuate surface concave inward.

[0008] Preferably, the shell is spherical and includes a first half-shell and a second half-shell, which are welded together; both the first half-shell and the second half-shell are provided with a plurality of spherical surfaces.

[0009] Preferably, the diameter of the spherical surface is 1 / 10 to 1 / 100 of the diameter of the shell; and the surface area of ​​the shell is 10 to 100 times the area of ​​the spherical surface.

[0010] Preferably, the heat storage core is rock, sand, cement, ceramic material, metal, phase change material, or molten salt cement.

[0011] Preferably, an aluminum foil layer or a nickel foil layer is wrapped around the outside of the heat storage core.

[0012] Preferably, the thickness of the shell is between 1.5mm and 3mm.

[0013] Preferably, a limiting groove is formed on the inner sidewall of the first half-shell and at the end near the second half-shell; a limiting block is integrally formed on the inner sidewall of the second half-shell and at the end near the first half-shell. When the first half-shell and the second half-shell are fastened together, the limiting block is fitted into the limiting groove; multiple limiting grooves and limiting blocks are provided at equal angles along the circumferential direction.

[0014] Preferably, after the first half-shell and the second half-shell are fastened together, they are sealed by welding.

[0015] (III) Beneficial Effects

[0016] This invention provides a multi-scenario integrated high-efficiency heat storage ball, which has multiple spherical surfaces integrally formed on the shell. The spherical surfaces include a first arc-shaped surface that protrudes outward and / or a second arc-shaped surface that is concave inward. This enables the heat storage ball to have the following functions: (1) supporting the internal heat storage body, preventing heat storage failure and blockage of heat exchange channels caused by the rupture of the solid heat storage body; (2) increasing the surface area of ​​the spherical structure, improving the heat exchange area, and significantly enhancing the heat exchange capacity of the spherical structure; (3) alleviating stress concentration caused by thermal expansion and improving the service life of the heat storage ball. Attached Figure Description

[0017] Figure 1 The cross-sectional view of the heat storage ball with a first arc-shaped surface and a second arc-shaped surface is shown to highlight the integrated high-efficiency function of this invention.

[0018] Figure 2 A cross-sectional view of the heat storage ball with a first arc-shaped surface, highlighting the integrated high-efficiency function of this invention;

[0019] Figure 3 A cross-sectional view of the heat storage ball with a second arc-shaped surface, highlighting the integrated high-efficiency function of this invention;

[0020] Figure 4 The cross-sectional view of the first half-shell and the second half-shell is shown in the present invention.

[0021] Figure 5 This is a schematic diagram illustrating the cooperation between the limiting groove and the limiting block in Embodiment 2 of the present invention;

[0022] Figure 6 This is a picture of a heat storage ball.

[0023] Marked in the attached diagram:

[0024] 100, shell; 110, spherical surface; 111, first arcuate surface; 112, second arcuate surface; 120, first half-shell; 121, limiting groove; 130, second half-shell; 131, limiting block; 200, heat storage core; 210, aluminum foil layer or nickel foil layer. Detailed Implementation

[0025] 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.

[0026] First Embodiment

[0027] This invention provides a heat storage ball with integrated high-efficiency functions for multiple scenarios, see [link / reference]. Figures 1-4 It includes a shell 100 and a heat storage core 200, with the heat storage core 200 located inside the shell 100.

[0028] The shell 100 is spherical in shape, and a plurality of spherical surfaces 110 are integrally formed on the shell 100. The spherical surfaces 110 include a first arcuate surface 111 that protrudes outward and / or a second arcuate surface 112 that is recessed inward.

[0029] like Figure 2 As shown, the spherical surface 110 can all be a single, outwardly convex first arcuate surface 111; as Figure 3 As shown and Figure 6 It can also be a separate, inwardly concave second arc-shaped surface 112; such as Figure 1 As shown, it may simultaneously have a first arcuate surface 111 and a second arcuate surface 112.

[0030] By setting the spherical surface 110, the heat storage ball has the following functions: (1) supporting the internal heat storage body, preventing heat storage failure and blockage of heat exchange channels caused by the rupture of the solid heat storage body; (2) increasing the surface area of ​​the spherical structure, improving the heat exchange area, and greatly enhancing the heat exchange capacity of the spherical structure; (3) alleviating the stress concentration caused by the thermal expansion process and improving the service life of the heat storage ball.

[0031] Specifically, the shell 100 is spherical, with a thickness between 1.5mm and 3mm, and includes a first half-shell 120 and a second half-shell 130. The first half-shell 120 and the second half-shell 130 are fixedly connected by welding. Multiple spherical surfaces 110 are provided on both the first half-shell 120 and the second half-shell 130.

[0032] During manufacturing, a first half-shell 120 and a second half-shell 130 with a first arc-shaped surface 111 and / or a second arc-shaped surface 112 are formed by stamping using a stamping die. Then, the heat storage core 200 is installed under the protection of an inert gas, and the first half-shell 120 and the second half-shell 130 are welded together.

[0033] The diameter of the spherical surface 110 is 1 / 10 to 1 / 100 of the diameter of the shell 100. The surface area of ​​the shell 100 is 10 to 100 times that of the spherical surface 110. The presence of the spherical surface 110 significantly increases the elasticity of the heat storage sphere shell 100. This elasticity can greatly alleviate stress concentration during the heating and cooling process of the heat storage sphere, thereby improving its service life.

[0034] When the spherical surface 110 is either the first arc-shaped surface 111 or the second arc-shaped surface 112, the heat dissipation capacity of this type of heat storage ball is more than 10 times that of a conventional spherical heat storage ball. When both the first arc-shaped surface 111 and the second arc-shaped surface 112 exist simultaneously, the heat dissipation capacity of this type of heat storage ball is more than 20 times that of a conventional spherical heat storage ball.

[0035] The unique convex and concave structure of this invention significantly improves the elasticity of the heat storage ball during the heating and cooling process of the heat storage material. The heat storage ball can expand and contract freely. Experiments show that it can be used more than 5,000 times. If it stores heat 300 times a year, its service life can reach more than 15 years.

[0036] In one embodiment, the heat storage core 200 is a granular or powdered heat storage material such as rock or sand. When using such a granular or powdered heat storage material, an aluminum foil layer or a nickel foil layer 210 is wrapped around the outside of the heat storage core 200. Wrapping the granular or powdered heat storage core 200 with the aluminum foil layer 210 or the nickel foil layer facilitates subsequent manufacturing.

[0037] In one embodiment, the heat storage core 200 is a heat storage material such as cement, ceramic material, metal, phase change material, or molten salt.

[0038] Second Embodiment

[0039] like Figure 5As shown, this embodiment differs from the first embodiment in that: a limiting groove 121 is formed on the inner wall of the first half-shell 120 near the end close to the second half-shell 130; a limiting block 131 is integrally formed on the inner wall of the second half-shell 130 near the end close to the first half-shell 120. When the first half-shell 120 and the second half-shell 130 are engaged, the limiting block 131 is fitted into the limiting groove 121; multiple limiting grooves 121 and limiting blocks 131 are provided at equal angles along the circumferential direction. By using the limiting grooves 121 and limiting blocks 131 formed on the inner side, the first half-shell 120 and the second half-shell 130 can be positioned during welding, facilitating welding. Simultaneously, after welding, the first half-shell 120 and the second half-shell 130 are staggered at the connection point. During thermal expansion, the forces on both sides of the welding point are more balanced, reducing the likelihood of cracking and improving the service life of the heat storage ball.

[0040] During installation, the first half-shell 120 and the second half-shell 130 are fastened together by the limiting groove 121 and the limiting block 131, and then welded to achieve a complete seal. The welding is carried out in a negative pressure glove box to prevent the heat storage ball from expanding and rupturing due to increased air pressure during use.

[0041] Third Embodiment

[0042] This embodiment provides an application scenario for a heat storage ball integrating high-efficiency functions. Details are as follows:

[0043] The heat storage ball in this embodiment is as follows: Figure 3 As shown, it is a concave heat storage sphere, that is, a second arc-shaped surface 112 that is concave inward is formed on the shell 100. Its shell layer is made of 2.5mm thin plate of 12Cr1MoV heat-resistant steel. The diameter of the heat storage sphere is 20mm. First, two concave heat storage sphere shells are prepared by stamping for later use. Then, heat storage sand is wrapped with aluminum foil to form a spherical core with a diameter of 20mm. The two are placed in a negative pressure environment and the heat storage sand and the heat storage sphere shell layer are assembled and welded by argon arc welding. After assembling 10,000 units, they are placed in the heat storage chamber for heat storage and heat release experiments. This experiment is used for waste heat recovery experimental device. The waste heat from the carbon plant calcination is introduced from the bottom of the heat storage chamber by a blower to gradually heat all the heat storage spheres. When the temperature of the heat storage spheres reaches the predetermined 600℃, heating is stopped. During heat release, cold air is introduced from the top of the heat storage chamber by a blower. The air moves from top to bottom and is gradually heated to form hot air. Hot air passes through an evaporator, vaporizing water to form industrial steam for power generation or other applications. Continuous thermal cycling tests show that after 5500 cycles, the thermal storage bulbs show no more than 1% damage.

[0044] Fourth embodiment

[0045] This embodiment provides an application scenario for a heat storage ball integrating high-efficiency functions. Details are as follows:

[0046] The heat storage ball in this embodiment is as follows: Figure 2 As shown, it is a convex heat storage ball. That is, a first arc-shaped surface 111 that protrudes outward is formed on the shell 100.

[0047] The outer shell (100) is made of 2mm thin sheet of 310S heat-resistant stainless steel. The diameter of the heat storage spheres is 30mm. First, two convex heat storage sphere shells are prepared by stamping. Then, pre-sintered 30mm diameter magnesium brick spheres are used as the spherical core. Both are placed in a negative pressure environment and argon arc welded to assemble the heat storage sand and the heat storage sphere shell layers. After assembling 9000 units, they are placed in a heat storage chamber for heat storage and release experiments. This experiment is used for off-peak electricity heating energy storage heating devices. Resistance wires for electric heating are pre-placed in the heat storage chamber. During off-peak electricity hours at night, the heat storage spheres are heated to 800℃ using electric heating. When wind power is available, a blower is used to extract heat from the heat storage spheres through air heat exchange. This heat is then heated to hot water through an air-to-water heat exchanger, and this hot water enters the city or community heating pipeline for residents' use. After 6000 cycles of accelerated testing, no heat storage spheres ruptured. Manual opening of the heat storage spheres revealed damage to the internal magnesium bricks. It is evident that the heat storage ball method significantly improves the service life of magnesia bricks.

[0048] Fifth embodiment

[0049] This embodiment provides an application scenario for a heat storage ball integrating high-efficiency functions. Details are as follows:

[0050] The heat storage ball in this embodiment is as follows: Figure 1 As shown, it is a convex-concave heat storage sphere. That is, a first arc-shaped surface 111 and a second arc-shaped surface 112 are formed on the shell 100.

[0051] The shell 100 is manufactured from 2mm thin sheet of 347H stainless steel, resistant to molten salt corrosion. The diameter of the heat storage spheres is 20mm. First, the convex-concave shell layer of the heat storage spheres is prepared by stamping. Then, a 20mm diameter solar salt heat storage material core is prepared using nickel foil. The two are then assembled and welded to the shell layer using argon arc welding. After assembling 8000 units, they are placed in a heat storage chamber for heat storage and release experiments. This experiment is used as an experimental device for the flexibility modification of thermal power plants. During off-peak electricity periods, the power plant uses extracted steam to heat the heat storage spheres in the heat storage chamber. Heating is stopped once the heat storage spheres reach a certain temperature. During the heat release phase, a blower blows hot air into the heat storage chamber. The hot air passes through an evaporator, vaporizing water to form industrial steam for power generation or other applications. Continuous thermal cycling tests show that the lifespan reaches 7000 cycles without heat storage sphere damage. This system avoids solidifying liquid molten salt, eliminating the need for extensive salt-making equipment and significantly reducing equipment costs.

[0052] As can be seen from the above embodiments, the present invention plays a very effective role and can be applied to most thermal storage scenarios, and has a very effective role in promoting new energy storage.

[0053] This invention provides a multi-scenario integrated high-efficiency heat storage ball, which has multiple spherical surfaces 110 integrally formed on the shell 100. This enables the heat storage ball to have the following functions: (1) supporting the internal heat storage body, preventing heat storage failure and blockage of heat exchange channels caused by the rupture of the solid heat storage body; (2) increasing the surface area of ​​the spherical structure, improving the heat exchange area, and greatly enhancing the heat exchange capacity of the spherical structure; (3) alleviating stress concentration caused by thermal expansion and improving the service life of the heat storage ball.

[0054] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Without conflict, the embodiments and features in the embodiments of this invention can be combined with each other.

[0056] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A heat storage ball with integrated high-efficiency functions for multiple scenarios, characterized in that, It includes a shell (100) and a heat storage core (200), the heat storage core (200) being located inside the shell (100); The housing (100) has a plurality of spherical surfaces (110) integrally formed thereon, the spherical surfaces (110) including a first arcuate surface (111) that protrudes outward and / or a second arcuate surface (112) that is recessed inward.

2. The heat storage ball with integrated high-efficiency functions for multiple scenarios according to claim 1, characterized in that, The shell (100) is spherical and includes a first half-shell (120) and a second half-shell (130), which are welded together. The first half-shell (120) and the second half-shell (130) are each provided with a plurality of spherical surfaces (110).

3. The heat storage ball with integrated high-efficiency functions for multiple scenarios according to claim 1, characterized in that, The diameter of the spherical surface (110) is 1 / 10 to 1 / 100 of the diameter of the shell (100); the surface area of ​​the shell (100) is 10 to 100 times the area of ​​the spherical surface (110).

4. The heat storage ball with integrated high-efficiency functions for multiple scenarios according to claim 1, characterized in that, The heat storage core (200) is made of rock, sand, cement, ceramic material, metal, phase change material or molten salt cement.

5. A multi-scenario integrated high-efficiency heat storage ball according to claim 1, characterized in that, An aluminum foil layer or a nickel foil layer (210) is wrapped around the outside of the heat storage core (200).

6. A multi-scenario integrated high-efficiency heat storage ball according to claim 1, characterized in that, The thickness of the shell (100) is between 1.5mm and 3mm.

7. A multi-scenario integrated high-efficiency heat storage ball according to claim 2, characterized in that, A limiting groove (121) is formed on the inner sidewall of the first half-shell (120) and at the end near the second half-shell (130); a limiting block (131) is integrally formed on the inner sidewall of the second half-shell (130) and at the end near the first half-shell (120). When the first half-shell (120) and the second half-shell (130) are fastened together, the limiting block (131) is fitted into the limiting groove (121). The limiting groove (121) and limiting block (131) are provided at multiple angles along the circumferential direction.

8. A multi-scenario integrated high-efficiency heat storage ball according to claim 7, characterized in that, After the first half-shell (120) and the second half-shell (130) are fastened together, they are sealed by welding.

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