A high efficiency packed bed energy storage device

Abstract

The utility model discloses a kind of high-efficiency packed bed type energy storage devices, including heat storage container, bubble generator and gas source, heat storage container is equipped with inner chamber, inner chamber is equipped with fence partition, fence partition is divided into first chamber and second chamber, first chamber is located above second chamber and is communicated with second chamber, a plurality of heat storage elements are equipped in first chamber, heat storage container is equipped with heat flow inlet and heat flow outlet in length direction two sides respectively, heat flow inlet and heat flow outlet are all communicated with first chamber, heat flow outlet is located above heat flow inlet;Bubble generator is installed in second chamber and is communicated with gas source by gas guide pipe, bubble generator is equipped with bubble hole to the side of first chamber. By setting bubble generator, disturb heat flow, to generate complex vortex and circulation, make the heat flow temperature of entire first chamber highly homogenization, improve the utilization of heat storage element.

Description

Technical Field

[0001] This utility model relates to the field of energy storage device technology, and in particular to a high-efficiency filled bed energy storage device. Background Technology

[0002] Phase change energy storage technology refers to the absorption and release of energy using phase change energy storage materials, which helps improve energy utilization efficiency and reduce pollutant and carbon dioxide emissions. The core of a packed bed phase change energy storage device designed and manufactured based on phase change energy storage technology lies in encapsulating phase change energy storage materials within thermal storage units. Multiple thermal storage units are then filled into a thermal storage tank, which is connected to a thermal system. Gaps exist between different thermal storage units, allowing the heat transfer fluid of the thermal system to flow through these gaps and exchange heat with the phase change energy storage materials within the units, thus achieving the absorption and release of thermal energy. This technology has advantages such as simple structure, low cost, and large heat transfer area. However, existing packed bed phase change energy storage devices are prone to a "thermal short-circuit" effect. Specifically, the random pore distribution within the packed bed leads to varying flow channel widths, causing the heat transfer fluid to preferentially pass through low-resistance paths. This results in uneven local temperatures, leading to insufficient heat exchange in localized areas of the bed, with some areas not participating in heat exchange at all. A large amount of the PCM (Phase Change Material) fails to complete the phase change, resulting in the actual stored energy of the device being far lower than the design value, severely impacting the efficiency of the energy storage device. Utility Model Content

[0003] The purpose of this invention is to provide a high-efficiency filled bed energy storage device that can actively disturb the heat flow and improve the utilization rate of the heat storage element.

[0004] To achieve this objective, the present invention adopts the following technical solution: a high-efficiency filled bed energy storage device, comprising a heat storage container, a bubble generator, and a gas source. The heat storage container has an inner cavity, which is divided into a first chamber and a second chamber by a grid partition plate. The first chamber is located above and communicates with the second chamber. The first chamber contains multiple heat storage elements. The heat storage container has a heat flow inlet and a heat flow outlet on both sides along its length. Both the heat flow inlet and the heat flow outlet communicate with the first chamber, and the heat flow outlet is located above the heat flow inlet. The bubble generator is installed in the second chamber and communicates with the gas source through a gas guide pipe. The bubble generator has bubble holes on the side facing the first chamber.

[0005] Preferably, the air duct is equipped with a filter.

[0006] Preferably, the air duct is provided with a one-way valve, which is located between the filter and the bubble generator.

[0007] Preferably, the air duct is equipped with a proportional flow valve, which is located between the filter and the air source.

[0008] Preferably, the high-efficiency filled bed energy storage device includes a controller and multiple temperature sensors, all of which are located in the first chamber. The gas source and the proportional flow valve are both electrically connected to the controller, and the multiple temperature sensors are all communicatively connected to the controller.

[0009] Preferably, the bubble generator includes a diffuser plate that matches the cross-sectional shape of the first chamber, and the bubble holes are distributed on the side of the diffuser plate facing the first chamber.

[0010] Preferably, the bubble generator includes multiple tubes, which are spaced apart along the length or width of the heat storage container, and the bubble holes are distributed on the top of the tubes.

[0011] Preferably, there are multiple first chambers arranged along the length of the heat storage container, and the second chamber, the bubble generator and the first chamber are arranged in a one-to-one correspondence.

[0012] Preferably, the bottom of the heat inlet is flush with the top surface of the fence partition in the vertical direction.

[0013] The beneficial effects of this utility model are as follows: By setting up a bubble generator, when the high-efficiency filled bed energy storage device is working, the heat flow enters the first chamber through the heat flow inlet, and the gas source starts simultaneously. Bubbles are introduced into the first chamber through the bubble generator. When the bubble group rises, it disturbs the heat flow, thereby generating complex eddies and circulations, making the heat flow temperature in the entire first chamber highly uniform. This reduces the temperature difference between the heat flow and the heat storage element during the heat exchange process, greatly improves the convective heat transfer coefficient between the heat flow and the heat storage element, and significantly improves the utilization rate of the heat storage element. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a high-efficiency filled bed energy storage device according to an embodiment of this utility model.

[0015] In the diagram: 100, thermal storage container; 110, fence partition; 120, first chamber; 121, heat inlet; 122, heat outlet; 130, second chamber; 140, thermal storage element; 200, bubble generator; 210, gas source; 220, filter; 230, one-way valve; 240, proportional flow valve; 250, air guide pipe. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0017] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0019] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0020] Reference Figure 1As shown, a high-efficiency filled bed energy storage device according to an embodiment of this application includes a heat storage container 100, a bubble generator 200, and a gas source 210. The heat storage container 100 is rectangular and has an inner cavity. The inner cavity is provided with a horizontal grid partition plate 110, which divides the inner cavity into a first chamber 120 and a second chamber 130. The first chamber 120 is located above and communicates with the second chamber 130. The first chamber 120 is provided with a plurality of heat storage elements 140, which are made by encapsulating phase change energy storage materials in spherical, square, or cylindrical sealed containers. The heat storage container 100 has a heat inlet 121 and a heat outlet 122 on both sides along its length. Both the heat inlet 121 and the heat outlet 122 communicate with the first chamber 120, and the heat outlet 122 is located above the heat inlet 121. The heat storage container 100 is connected to the thermal management system through a heat inlet 121 and a heat outlet 122, so that the heat flow passes sequentially through the heat inlet 121, the inner cavity, and the heat outlet 122. In this embodiment, the heat flow is the fluid refrigerant. A bubble generator 200 and a gas source 210 are included. The bubble generator 200 is installed in the second chamber 130 and is connected to the gas source 210 through a gas guide pipe 250. The bubble generator 200 has bubble holes on the side facing the first chamber 120. The projection of the first chamber 120 in the horizontal plane is located within the projection of the bubble cluster generated by the bubble holes in the horizontal plane.

[0021] Understandably, by setting up the bubble generator 200, when the high-efficiency filled bed energy storage device is working, the heat flow enters the first chamber 120 through the heat flow inlet 121, and the gas source 210 is started simultaneously. Bubbles are introduced into the first chamber 120 through the bubble generator 200. When the bubble group rises, it disturbs the heat flow, thereby generating complex eddies and circulations among multiple heat storage elements 140. This drives the heat flow through high-resistance paths that would not normally flow through, eliminating heat exchange dead zones and making the heat flow temperature highly uniform throughout the first chamber 120. This reduces the temperature difference between the heat flow and the heat storage elements 140 during the heat exchange process, greatly improves the convective heat transfer coefficient between the heat flow and the heat storage elements 140, and significantly improves the utilization rate of the heat storage elements 140. As a result, the actual heat exchange efficiency of the energy storage device approaches or reaches the preset theoretical heat exchange efficiency.

[0022] Furthermore, in the vertical direction, the bottom of the heat inlet 121 is flush with the top surface of the fence partition plate 110.

[0023] It is understandable that, under the premise that the heat flow outlet 122 is located above the heat flow inlet 121 and the bubble group flows from bottom to top, the bottom of the heat flow inlet 121 is flush with the top surface of the fence partition plate 110, so that the heat flow can contact and exchange heat with the heat storage element 140 at the bottom after entering the first chamber 120, thereby improving the utilization rate of the heat storage element 140 at the bottom of the first chamber 120.

[0024] The gas duct 250 is equipped with a filter 220. In this embodiment, the filter 220 is a gas filter filled with filter materials such as non-woven fabric, glass fiber, nylon mesh, and synthetic fiber felt. The filter 220 is integrated into the pipeline through a structure such as a sealing flange.

[0025] By setting up filter 220, the gas source 210 can be purified into the bubble generator 200, preventing impurities from settling in the inner cavity, which could lead to blockage of the energy storage device, increased thermal flow resistance, or thermal contamination that could affect the operation of the thermal system.

[0026] Furthermore, a one-way valve 230 is provided on the air duct 250, which is located between the filter 220 and the bubble generator 200.

[0027] By setting a one-way valve 230 between the filter 220 and the bubble generator 200, heat flow can be prevented from flowing back into the filter 220 or even the air source 210 through the bubble holes of the bubble generator 200, thereby improving the working stability of the bubble generator 200.

[0028] Furthermore, a proportional flow valve 240 is provided on the air duct 250, which is located between the filter 220 and the air source 210.

[0029] By setting the proportional flow valve 240, the user can precisely control the gas flow rate output by the gas source 210, so that the bubble density of the bubble generator 200 corresponds to the heat flow rate. For example, when the heat flow rate is small, the proportional flow valve 240 opens larger, allowing the bubble generator 200 to generate a denser bubble cluster, rapidly agitating the heat flow, increasing the Reynolds number of the heat flow, prolonging the contact time between the large flow of heat flow and the heat storage unit, and enhancing the energy storage effect of the energy storage system; when the heat flow rate is large, the Reynolds number of the heat flow itself is high, and the proportional flow valve 240 opens smaller to reduce the system pressure drop and maintain system economy.

[0030] Optionally, the high-efficiency filled bed energy storage device includes a controller and multiple temperature sensors. All temperature sensors are located in the first chamber 120. The gas source 210 and the proportional flow valve 240 are electrically connected to the controller, and all temperature sensors are communicatively connected to the controller. Optionally, the multiple temperature sensors can be arranged at intervals along the vertical direction or at intervals along the length of the thermal storage container 100.

[0031] By setting up a controller and multiple sensors, the controller can receive the sensing signals from multiple sensors, thereby determining the temperature distribution in the first chamber 120, and then controlling the proportional flow valve 240 to increase or decrease its opening, thus realizing the automatic control of the proportional flow valve 240 and effectively improving the automation level of the thermal storage device.

[0032] In some embodiments, the bubble generator 200 includes a diffuser plate that matches the cross-sectional shape of the first chamber 120, i.e., the diffuser plate is rectangular with the same cross-sectional shape and size as the first chamber 120, and bubble holes are distributed on the side of the diffuser plate facing the first chamber 120.

[0033] By incorporating a diffuser plate, the structure of the bubble generator 200 can be simplified, making it easier for users to arrange and use, and reducing the arrangement cost of the bubble generator 200. Optionally, in some embodiments, the diffuser plate can be fixed to the second chamber 130 by means of a bracket, flange, or other structure. In other embodiments, the second chamber 130 is provided with a pull-out frame structure, and the diffuser plate is detachably connected to the frame structure, improving the ease of installation and removal of the bubble generator 200.

[0034] In other embodiments, the bubble generator 200 includes a plurality of tubes spaced apart along the length or width of the heat storage container 100, with bubble holes distributed on the top of the tubes.

[0035] By setting multiple tubes with bubble holes, on the one hand, when some bubble holes become clogged, the user can simply replace the corresponding tube without having to repair or replace the entire bubble generator 200, thus reducing the later maintenance costs of the bubble generator 200; on the other hand, the user can arrange an appropriate number of tubes according to the size of the first chamber 120, without having to customize the size of the tubes according to the size of the first chamber 120, thus reducing the production and layout costs of the bubble generator 200.

[0036] Optionally, multiple first chambers 120 are provided, and adjacent first chambers 120 are separated by vertical partitions. Multiple first chambers 120 are arranged along the length of the heat storage container 100. The second chamber 130, the bubble generator 200 and the first chamber 120 are arranged in a one-to-one correspondence. Each first chamber 120 is provided with multiple temperature sensors.

[0037] By setting multiple first chambers 120, with each first chamber 120 corresponding to a bubble generator 200, gradient management of the temperature field in the inner cavity can be implemented. Each bubble generator 200 disturbs the heat flow in the corresponding first chamber 120 to generate turbulence, thereby forming a temperature field in each first chamber 120. During the flow, the heat flow first exchanges heat with the heat storage elements 140 in different temperature fields in sequence, and then exchanges heat with each other between different temperature fields, thereby making the temperature in the entire interior approach uniform and further improving the heat exchange efficiency of the heat storage elements 140. On the other hand, the two adjacent partitions and the partitions and the inner wall of the heat storage container 100 can cooperate with each other to limit the heat storage elements 140 in each first chamber 120, thereby improving the installation stability of the heat storage elements 140.

[0038] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A high-efficiency filled bed energy storage device, characterized in that, include: A heat storage container (100) has an inner cavity, and the inner cavity is provided with a grid partition plate (110). The grid partition plate (110) divides the inner cavity into a first chamber (120) and a second chamber (130). The first chamber (120) is located above the second chamber (130) and communicates with the second chamber (130). The first chamber (120) is provided with a plurality of heat storage elements (140). The heat storage container (100) has a heat flow inlet (121) and a heat flow outlet (122) on both sides in the length direction. The heat flow inlet (121) and the heat flow outlet (122) are both communicated with the first chamber (120). The heat flow outlet (122) is located above the heat flow inlet (121). A bubble generator (200) and a gas source (210) are provided. The bubble generator (200) is installed in the second chamber (130) and is connected to the gas source (210) through a gas guide pipe (250). The bubble generator (200) has a bubble hole on the side facing the first chamber (120).

2. The high-efficiency filled bed energy storage device according to claim 1, characterized in that, The air duct (250) is equipped with a filter (220).

3. The high-efficiency filled bed energy storage device according to claim 2, characterized in that, The air guide pipe (250) is equipped with a one-way valve (230), which is located between the filter (220) and the bubble generator (200).

4. The high-efficiency filled bed energy storage device according to claim 2, characterized in that, The air duct (250) is equipped with a proportional flow valve (240), which is located between the filter (220) and the air source (210).

5. The high-efficiency filled bed energy storage device according to claim 4, characterized in that, The high-efficiency filled bed energy storage device includes a controller and multiple temperature sensors. The multiple temperature sensors are all located in the first chamber (120). The gas source (210) and the proportional flow valve (240) are both electrically connected to the controller. The multiple temperature sensors are all communicatively connected to the controller.

6. The high-efficiency filled bed energy storage device according to any one of claims 1-5, characterized in that, The bubble generator (200) includes a diffuser plate that matches the cross-sectional shape of the first chamber (120), and the bubble holes are distributed on the side of the diffuser plate facing the first chamber (120).

7. The high-efficiency filled bed energy storage device according to any one of claims 1-5, characterized in that, The bubble generator (200) includes a plurality of tubes, which are spaced apart along the length or width of the heat storage container (100), and the bubble holes are distributed on the top of the tubes.

8. The high-efficiency filled bed energy storage device according to any one of claims 1-5, characterized in that, The first chamber (120) is provided in multiple ways, and the multiple first chambers (120) are arranged along the length direction of the heat storage container (100). The second chamber (130), the bubble generator (200) and the first chamber (120) are arranged in a one-to-one correspondence.

9. The high-efficiency filled bed energy storage device according to any one of claims 1-5, characterized in that, In the vertical direction, the bottom of the heat inlet (121) is flush with the top surface of the fence partition (110).

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