An apparatus for heat storage and cold storage using a solid medium
Patent Information
- Application Number
- CN202522173820.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-14
- Publication Date
- 2026-10-20
- Estimated Expiration
- 2035-10-14
AI Technical Summary
[0005]输出参数不稳定：流体在填充床内的流动路径复杂且不均匀，容易产生沟流或短路现象，即部分流体未经充分换热就流出设备，导致出口流体温度波动，难以精确控制和稳定维持释热与释冷过程中的参数
[0015]与现有固体填充床方案相比，本实用新型的有益效果包括：通过设置周边流体折返通道实现蛇形跨层，减少了局部短路与混合；斜温层更薄且保持时间更长，静置阶段层间扩散受到有效的抑制，可有效管理设备内的斜温层，并稳定输出参数。
Smart Images
Figure CN224872934U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of solid medium heat storage, cold storage and heat exchange technology, specifically relating to a heat storage and cold storage device based on a layered orthogonal straight tube, interlayer overall insulation and perimeter folding channel configuration. Background Technology
[0002] Solid packed beds typically consist of a container and a packing of low-cost solid particles inside. During the heating phase, a high-temperature fluid flows in from one end, passing through the gaps between the particles and transferring heat to the solid particles, which are then stored within them. Simultaneously, a temperature gradient region, or sloping temperature layer, is formed within the bed along the direction of fluid flow. During the heat release phase, a low-temperature fluid flows in the opposite direction through the packed bed, absorbing heat from the heated solid particles, thus achieving a stable high-temperature output.
[0003] However, traditional solid packed bed technology has the following problems in practical applications:
[0004] Temperature gradient management is difficult: During long periods of quiescence or multiple cycles, the point contact heat conduction between solid particles and the natural convection and uneven flow that may occur in the porous medium can lead to an increase in the thickness of the temperature gradient and a smoother temperature gradient.
[0005] Unstable output parameters: The flow path of the fluid in the packed bed is complex and uneven, which can easily lead to channeling or short-circuiting. This means that some fluid flows out of the equipment without sufficient heat exchange, resulting in fluctuations in the outlet fluid temperature. It is difficult to accurately control and maintain the parameters during the heat release and cooling process.
[0006] In summary, how to effectively manage the thermocline and ensure the stability of output parameters is a technical problem that needs to be solved in the field of solid thermal and cold storage technology. Utility Model Content
[0007] Existing solid packed bed technology struggles to effectively manage the hot and cold zones (temperature gradients) within the equipment and stabilize output parameters. Specifically, due to uneven fluid flow within the equipment, mixing and short-circuiting easily occur, resulting in unstable output temperatures.
[0008] To address the aforementioned problems, this invention provides a heat and cold storage device using a solid medium, comprising a heat storage plate, an insulation plate, a straight pipe assembly, and a fluid return channel. The fluid return channel is an annular cavity and / or a collection of pipes disposed around the heat storage plate, and is connected to the ends of each layer of straight pipe assemblies.
[0009] Furthermore, within each layer of the heat storage plate, a first straight pipe group and a second straight pipe group are arranged along the X-axis and Y-axis, respectively. The straight pipes within the first and second straight pipe groups are arranged parallel to each other at equal intervals in their respective directions. Multiple layers of heat storage plates are stacked along the Z-axis, and an insulation plate is arranged between adjacent layers. The insulation plate covers the entire direct heat exchange area between adjacent layers and is not traversed by any pipes. Outside the heat storage plates and the insulation plate, fluid return channels are arranged to achieve serpentine return connections between adjacent layers and within the straight pipe groups of a single layer. When hot and cold flows within the heat storage plates along the X-axis and Y-axis, a temperature gradient layer is formed in the Z-axis direction, representing heat storage and cold release, and cold storage and heat release.
[0010] Optionally, the first straight pipe group and the second straight pipe group can use the same heat exchange fluid, and are connected in series within each layer of the heat storage plate through the fluid return channel. Furthermore, the fluid return channel can also enable cross-layer series connection between the first straight pipe group and the second straight pipe group between different layers of the heat storage plate.
[0011] Optionally, the first straight pipe group and the second straight pipe group can be used for different heat exchange fluids, and their respective cross-layer series connections between the heat storage plates in different layers are achieved through the fluid reversal channel. Furthermore, the first straight pipe group and the second straight pipe group receive different heat exchange fluids, and the heat release and cold release processes occur simultaneously.
[0012] Preferably, the heat storage plate is made of graphite-quartz-aluminum phosphate composite material, and has a thermal conductivity k ≥ 8W·m⁻¹·K⁻¹ in the temperature range of 100K–700K.
[0013] Preferably, a contact interface containing graphite foil is provided between the straight pipe and the heat storage plate. Furthermore, a replaceable orifice plate is provided at the inlet of the first straight pipe group and / or the second straight pipe group to achieve flow balance among the straight pipes within the straight pipe group.
[0014] This utility model provides a working process for a heat storage and cold storage device using a solid medium, comprising a heat storage and cold release stage, a settling stage, and a cold storage and heat release stage. In the heat storage and cold release stage, the heat storage and cold release stage ends after the thermoclinic layer migrates to the first heat storage plate at the hot end. In the settling stage, the insulating plate suppresses interlayer heat conduction between adjacent heat storage plates, protecting the thermoclinic layer's morphology. In the cold storage and heat release stage, the cold storage and heat release stage ends after the thermoclinic layer migrates to the first heat storage plate at the cold end.
[0015] Compared with existing solid packed bed solutions, the advantages of this invention include: by setting up peripheral fluid return channels to achieve serpentine cross-layering, local short circuits and mixing are reduced; the inclined temperature layer is thinner and has a longer holding time, and interlayer diffusion is effectively suppressed during the static stage, which can effectively manage the inclined temperature layer in the equipment and stabilize output parameters. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of a heat and cold storage device that uses a solid medium.
[0017] Figure 2 This is a schematic diagram of the planar structure of a single-layer heat storage plate.
[0018] Figure 3 This is a schematic diagram showing the positional relationship between two adjacent heat storage plates and insulation plates.
[0019] Figure 4 This is a schematic diagram of the flow of the same fluid within a fluid reversal channel.
[0020] Figure 5 This is a schematic diagram of the same fluid flowing within the heat storage plate layer.
[0021] Figure 6 This is a schematic diagram of fluid flow between two adjacent heat storage plates.
[0022] Figure 7 This is a schematic diagram showing the flow of different fluids within the heat storage plate layer.
[0023] Explanation of reference numerals in the attached figures
[0024] 1—Heat storage plate; 2—Insulation plate; 3—Straight pipe group; 4—Fluid return channel; 5—First straight pipe group; 6—Second straight pipe group. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0026] The technical parameters described in this utility model all include the controllable accuracy and fault tolerance range of the technical parameters in specific implementation, and should not be construed as precise limitations on the technical parameters.
[0027] This utility model provides a heat and cold storage device using a solid medium, and a specific embodiment thereof is described in reference. Figure 1-6. Reference Figure 1 The heat and cold storage device using a solid medium includes a heat storage plate (1), an insulation plate (2), a straight pipe assembly (3), and a fluid return channel (4). The heat storage plate (1) is stacked in multiple layers along the vertical direction (Z-axis). Preferably, the heat storage plate (1) is made of graphite-quartz-aluminum phosphate composite material, with a thermal conductivity k ≥ 8 W·m⁻¹·K⁻¹ in the temperature range of 100K–700K.
[0028] Reference Figure 2 The straight pipe group (3) includes the first straight pipe group (5) and the second straight pipe group (6). In each layer of the heat storage plate (1), the first straight pipe group (5) and the second straight pipe group (6) are arranged along the X-axis and Y-axis, respectively. The straight pipes in the first straight pipe group (5) and the second straight pipe group (6) are arranged in parallel at equal intervals in their respective directions and are perpendicularly intersecting in space. Preferably, the first straight pipe group (5) is arranged in parallel at equal intervals along the X-axis direction, and the second straight pipe group (6) is arranged in parallel at equal intervals along the Y-axis direction. The use of mutually orthogonal straight pipe structures not only facilitates processing, manufacturing and assembly, but also makes the heat distribution in the plane of a single layer of the heat storage plate (1) more uniform. When the heat flow and cold flow flow in the heat storage plate (1) along the X-axis and Y-axis directions, a temperature gradient layer of heat storage and cold release and cold storage and heat release is formed in the Z-axis direction. Preferably, the first straight pipe group (5) and the second straight pipe group (6) use the same heat exchange fluid, and are connected in series within each layer of the heat storage plate (1) through the fluid return channel (4). Further, replaceable orifice plates are provided at the inlet of the first straight pipe group (5) and / or the second straight pipe group (6) to achieve flow balance among the straight pipes within the straight pipe group. Preferably, a contact interface containing graphite foil is provided between the first straight pipe group (5), the second straight pipe group (6), and the heat storage plate (1).
[0029] Reference Figure 3 An insulation plate (2) is arranged between two adjacent heat storage plates (1). The insulation plate (2) covers the entire direct heat exchange area between the two adjacent heat storage plates (1) and is not traversed by any pipes. It can block the heat conduction path through the solid material in the Z-axis direction and maintain a clear temperature gradient. Preferably, the insulation plate (2) can be made of a material with extremely low thermal conductivity, such as ceramic fiber board, nanoporous insulation material or vacuum insulation board.
[0030] Reference Figure 4 The fluid return channel (4) is an annular cavity and / or pipeline assembly set around the heat storage plate (1), and is connected to the ends of each straight pipe group (3) in a corresponding manner, so as to realize the serpentine return connection between adjacent heat storage plates (1) and between the first straight pipe group (5) and the second straight pipe group (6) in a single heat storage plate (1).
[0031] refer to Figure 5 Within the single-layer heat storage plate (1), the fluid reversal channel (4) connects the inlet of the first straight pipe group (5) with the outlet of the second straight pipe group (6), so that the fluid flowing in the X direction and the fluid flowing in the Y direction merge.
[0032] refer to Figure 6 In order to achieve continuous flow of fluid between the heat storage plates (1) in each layer without damaging the integrity of the insulation plates (2) between layers, the fluid return channel (4) connects the outlet of the first straight pipe group (5) of the upper layer with the inlet of the second straight pipe group (6) of the lower layer.
[0033] Furthermore, this utility model provides a working process for a heat storage and cold storage device using a solid medium, including a heat storage and cold release stage, a static stage, and a cold storage and heat release stage. In the heat storage and cold release stage, the heat storage and cold release stage ends after the oblique temperature layer migrates to the first heat storage plate (1) at the hot end; in the static stage, the heat insulation plate (2) suppresses interlayer heat conduction between two adjacent heat storage plates (1) to protect the shape of the oblique temperature layer; in the cold storage and heat release stage, the cold storage and heat release stage ends after the oblique temperature layer migrates to the first heat storage plate (1) at the cold end.
[0034] This invention provides a heat and cold storage device using a solid medium. Another specific embodiment is described below. Figure 1-4 and Figure 6-7 . Reference Figure 1 The heat and cold storage device using a solid medium includes a heat storage plate (1), an insulation plate (2), a straight pipe assembly (3), and a fluid return channel (4). The heat storage plate (1) is stacked in multiple layers along the vertical direction (Z-axis). Preferably, the heat storage plate (1) is made of graphite-quartz-aluminum phosphate composite material, with a thermal conductivity k ≥ 8 W·m⁻¹·K⁻¹ in the temperature range of 100K–700K.
[0035] Reference Figure 2The straight pipe group (3) includes the first straight pipe group (5) and the second straight pipe group (6). In each layer of the heat storage plate (1), the first straight pipe group (5) and the second straight pipe group (6) are arranged along the X-axis and Y-axis, respectively. The straight pipes in the first straight pipe group (5) and the second straight pipe group (6) are arranged in parallel at equal intervals in their respective directions and are perpendicularly intersecting in space. Preferably, the first straight pipe group (5) is arranged in parallel at equal intervals along the X-axis direction, and the second straight pipe group (6) is arranged in parallel at equal intervals along the Y-axis direction. The use of mutually orthogonal straight pipe structures not only facilitates processing, manufacturing and assembly, but also makes the heat distribution in the plane of the single-layer heat storage plate (1) more uniform. When the heat flow and cold flow flow in the heat storage plate (1) along the X-axis and Y-axis directions, a temperature gradient layer of heat storage and cold release and cold storage and heat release is formed in the Z-axis direction. Preferably, the first straight pipe group (5) and the second straight pipe group (6) are used for different heat exchange fluids, and are connected in series across different layers of the heat storage plate (1) through the fluid return channel (4). Furthermore, replaceable orifice plates are provided at the inlet of the first straight pipe group (5) and / or the second straight pipe group (6) to achieve flow balance among the straight pipes within the straight pipe group. A contact interface containing graphite foil is provided between the first straight pipe group (5), the second straight pipe group (6), and the heat storage plate (1).
[0036] Reference Figure 3 An insulation plate (2) is arranged between two adjacent heat storage plates (1). The insulation plate (2) covers the entire direct heat exchange area between the two adjacent heat storage plates (1) and is not traversed by any pipes. It can block the heat conduction path through the solid material in the Z-axis direction and maintain a clear temperature gradient. Preferably, the insulation plate (2) can be made of a material with extremely low thermal conductivity, such as ceramic fiber board, nanoporous insulation material or vacuum insulation board.
[0037] Reference Figure 4 The fluid return channel (4) is an annular cavity and / or pipeline assembly set around the heat storage plate (1), and is connected to the ends of each straight pipe group (3) in a corresponding manner, so as to realize the return connection of the first straight pipe group (5) and the second straight pipe group (6) between adjacent heat storage plates (1).
[0038] refer to Figure 6-7 The first straight pipe group (5) and the second straight pipe group (6) are used for different heat exchange fluids, and the fluid return channel (4) enables cross-layer series connection between the heat storage plates (1) in different layers, so that the heat release and cooling processes can be carried out simultaneously.
[0039] Furthermore, this utility model provides a working process for a heat storage and cold storage device using a solid medium, including a heat storage and cold release stage, a static stage, and a cold storage and heat release stage. In the heat storage and cold release stage, the heat storage and cold release stage ends after the oblique temperature layer migrates to the first heat storage plate (1) at the hot end; in the static stage, the heat insulation plate (2) suppresses interlayer heat conduction between two adjacent heat storage plates (1) to protect the shape of the oblique temperature layer; in the cold storage and heat release stage, the cold storage and heat release stage ends after the oblique temperature layer migrates to the first heat storage plate (1) at the cold end.
Claims
1. A device for heat and cold storage using a solid medium, characterized in that, It includes a heat storage plate (1), an insulation plate (2), a straight pipe assembly (3), and a fluid return channel (4); The heat storage plates (1) are stacked along the Z-axis in multiple layers; The first straight pipe group (5) and the second straight pipe group (6) located inside each heat storage plate (1) are arranged in parallel and orthogonal directions along the X-axis and Y-axis, respectively. An integral heat exchange plate (2) is provided between two adjacent heat storage plates (1). The heat exchange plate (2) covers the direct heat exchange area of the two heat storage plates (1) and is not penetrated by any pipes. A fluid return channel (4) is provided outside the heat storage plate (1) and the insulation plate (2). The fluid return channel (4) is connected to the end of each layer of straight pipe group (3), so that each layer of straight pipe group (3) is connected in a serpentine path. The heat exchange fluid flows sequentially through the first straight pipe group (5) and the second straight pipe group (6) in each layer and passes continuously between layers, forming a temperature-sloping layer for heat storage and cold release, and cold storage and heat release in the Z-axis direction.
2. The apparatus as described in claim 1, characterized in that: During the heat storage and cooling phase, the heat storage and cooling phase ends after the inclined temperature layer migrates to the first heat storage plate (1) at the hot end; During the static stage, the insulation plate (2) inhibits the interlayer heat conduction between the two adjacent heat storage plates (1) and protects the morphology of the inclined temperature layer; During the cold storage and heat release phase, the cold storage and heat release phase ends after the oblique temperature layer migrates to the first heat storage plate (1) at the cold end.
3. The apparatus as described in claim 1, characterized in that: The fluid return channel (4) is an annular cavity and / or pipeline assembly set around the heat storage plate (1), and is connected to the ends of each layer of straight pipe group (3) in a corresponding manner.
4. The apparatus as claimed in claim 1, characterized in that: The first straight pipe group (5) and the second straight pipe group (6) are used for the same heat exchange fluid and are connected in series within the same heat storage plate (1) through the fluid return channel (4). They are also connected in series across adjacent heat storage plates (1) through the fluid return channel (4).
5. The apparatus as claimed in claim 1, characterized in that: The first straight pipe group (5) and the second straight pipe group (6) are respectively introduced with different heat exchange fluids, and are connected in series across different layers of heat storage plates (1) through the fluid return channel (4), so that heat release and cooling can be carried out simultaneously.
6. The apparatus as claimed in claim 1, characterized in that: Replaceable orifice plates are installed at the inlet of the first straight pipe group (5) and / or the second straight pipe group (6) to achieve flow balance among the straight pipes in the straight pipe group (3).
7. The apparatus as claimed in claim 1, characterized in that: A contact interface containing graphite foil is provided between the straight pipe group (3) and the heat storage plate (1).
8. The apparatus as claimed in claim 1, characterized in that: The heat storage plate (1) is made of graphite-quartz-aluminate phosphate composite material, and has a thermal conductivity k ≥ 8W·m⁻¹·K⁻¹ in the temperature range of 100K–700K.
9. The apparatus as claimed in claim 1, characterized in that: The straight pipes in the first straight pipe group (5) and the second straight pipe group (6) are arranged in parallel at equal intervals in their respective directions.