Integrated ground heat exchanger based on ground heat storage system

Abstract

The utility model discloses an integrated buried pipe heat exchange device based on buried energy storage system relates to buried energy storage heat exchange technical field, include: the inner tube is injected heat exchange fluid and is set up in the vertical buried hole that is dug in advance around or below energy storage system inside, as deep heat exchange circuit and is connected to the preset ground source heat pump system, is used for summer heat dissipation and winter auxiliary heat extraction, the outer tube is injected heat exchange fluid and is laid when buried hole backfill to the underground preset depth inside, and is set up around the outside of inner tube, as shallow waste heat recovery loop, and is connected with the battery liquid cooling system of energy storage system, is used for absorbing the waste heat of energy storage system generation. The present application has the effect of high -efficient recovery waste heat of energy storage process generation.

Description

Technical Field

[0001] This application relates to the field of underground energy storage and heat exchange technology, and in particular to an integrated underground pipe heat exchange device based on an underground energy storage system. Background Technology

[0002] The underground energy storage system consists of two parts: above ground and underground. It adopts a modular design. The underground part is the underground battery unit, which achieves temperature stability, physical protection and intensive land use through the underground environment. The above ground part is the DIEM cabinet (DC network manager). The two parts are electrically connected to form a complete medium and large-scale energy storage system, which together completes the functions of energy storage and release.

[0003] When an energy storage system is charging and discharging at high power, the continuously generated waste heat is very likely to accumulate around the battery compartment, forming a "hot zone". To solve the heat dissipation problem, the industry generally adopts an active liquid cooling solution, which integrates a liquid cooling plate inside the battery pack to carry away the heat and discharge it into the atmosphere or soil. Although the heat can be dissipated, there is a lack of effective recovery and utilization of this waste heat, resulting in energy waste. Therefore, this application proposes a new technical solution. Utility Model Content

[0004] In order to efficiently recover the waste heat generated during the energy storage process, this application provides an integrated underground pipe heat exchange device based on an underground energy storage system.

[0005] This application provides an integrated buried pipe heat exchange device based on a buried energy storage system, which adopts the following technical solution: An integrated underground pipe heat exchange device based on an underground energy storage system includes: The inner tube, which is filled with heat exchange fluid and is installed in a vertical buried hole pre-dug around or below the energy storage system, serves as a deep heat exchange loop and is connected to a pre-set ground source heat pump system for heat dissipation in summer and auxiliary heat extraction in winter. The outer pipe, which is filled with heat exchange fluid and laid when the buried hole is backfilled to a predetermined depth underground, is set around the outside of the inner pipe as a shallow waste heat recovery loop and is connected to the battery liquid cooling system of the energy storage system to absorb the waste heat generated by the energy storage system.

[0006] Optionally, the outer tube is a horizontal spiral coil structure and is arranged around the buried hole.

[0007] Optionally, the inner tube is configured as a U-shaped tube.

[0008] Optionally, it also includes a heat insulation sleeve, which is sleeved around the outer periphery of the inner tube and located inside the outer tube.

[0009] Optionally, the inner tube includes two vertical tubes, a U-shaped bend, and multiple fasteners. The two ends of the bend are fixedly connected to the lower ends of the two vertical tubes, and the multiple fasteners are arranged at intervals along the length of the vertical tubes to fix the relative positions of the two vertical tubes.

[0010] Optionally, the fastener includes a connecting rod, a telescopic rod, and two fixing rings, wherein one fixing ring is fixedly connected to the connecting rod, and the other fixing ring is fixedly connected to the telescopic rod. The telescopic rod is threaded through the connecting rod, and the two fixing rings are respectively fixedly sleeved on the outside of the two vertical pipes. The connecting rod and the telescopic rod fixed at the uppermost end of the vertical pipe are respectively fixedly connected to the opposite ends of the connecting rod and the telescopic rod, and the upper ends of the two lifting lugs extend in the direction of approaching each other.

[0011] Optionally, the fixing ring includes a first retaining ring and a second retaining ring. The ends of the connecting rod and the telescopic rod that are opposite to each other are respectively fixedly connected to an assembly block. One end of the first retaining ring is rotatably connected to the assembly block, and one end of the second retaining ring is rotatably connected to the assembly block. The first retaining ring and the second retaining ring surround the outside of the vertical pipe. The ends of the first retaining ring and the second retaining ring that are opposite to the assembly block are fixedly connected to a fixing block. Both fixing blocks have a slot opened in the transverse direction, and a retaining block slides through the slot.

[0012] Optionally, one end of the card block is located in the card slot, and the other end extends out of the card slot and a spring is fixedly embedded on the side of the protruding end facing the side wall of the underground hole. One end of the spring extends out of the surface of the card block and is fixedly connected to a buffer block. The side of the buffer block facing the side wall of the underground hole is arranged in an arc shape.

[0013] Optionally, a counterweight is fixedly connected to the bottom bend of the pipe head.

[0014] In summary, this application has the following beneficial technical effects: it completes all processes of drilling, shallow coil laying, deep pipe installation, and backfilling in one go, while solving the needs of shallow waste heat recovery and deep heat exchange, significantly shortening the construction cycle, and saving land area and engineering costs of repeated excavation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0016] Figure 2 This is a structural schematic diagram of the fastener according to an embodiment of this application.

[0017] Figure 3 This is a schematic diagram of the structure of the fixing ring according to an embodiment of this application.

[0018] Explanation of reference numerals in the attached drawings: 1. Inner pipe; 2. Outer pipe; 3. Insulation sleeve; 11. Vertical pipe; 12. Bend; 4. Fixing component; 13. Counterweight; 41. Connecting rod; 42. Telescopic rod; 43. Fixing ring; 44. Lifting lug; 5. Assembly block; 431. Clamping ring one; 432. Clamping ring two; 433. Fixing block; 434. Clamping groove; 435. Clamping block; 436. Spring; 437. Buffer block. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0020] This application discloses an integrated underground pipe heat exchange device based on an underground energy storage system.

[0021] Reference Figure 1 The integrated buried pipe heat exchange device based on the buried energy storage system includes an inner pipe 1 and an outer pipe 2. The inner pipe 1 is filled with heat exchange fluid and is installed in a vertical buried hole pre-dug around or below the energy storage system. In this embodiment, the depth of a single vertical buried hole is 80-100 meters. The inner pipe 1 is hoisted into the center of the buried hole using a crane. The inner pipe 1 has a U-shaped pipe structure and serves as a deep heat exchange loop, connected to a pre-set ground source heat pump system. The ground source heat pump system is an existing technology and serves as the main heat source for the building. The two upper ends of the U-shaped pipe are connected to the inlet and outlet ends of the ground source heat pump system, respectively, so that the heat exchange fluid enters the evaporator (winter) or condenser (summer) inside the ground source heat pump system. In summer, the heat of the building is dissipated into the ground, and in winter, heat is extracted from the ground to provide cooling or heating for the building.

[0022] Heat exchange fluid is injected into the outer pipe 2 and laid when the buried hole is backfilled to a preset underground depth (such as 2-3 meters). The outer pipe 2 is arranged around the outside of the inner pipe 1. In this embodiment, the outer pipe 2 is a horizontal spiral coil structure and is arranged around the buried hole as a shallow waste heat recovery loop. It is connected to the battery liquid cooling system of the energy storage system. The battery liquid cooling system is a prior art technology that absorbs battery waste heat and transfers the heat to the horizontal spiral coil, and dissipates heat to the surrounding soil to achieve cooling.

[0023] It should be noted that the ground source heat pump system and battery liquid cooling system in the above-mentioned prior art both include a circulation pump to drive the heat exchange fluid to circulate in the pipe.

[0024] With the above setup, in summer, the waste heat generated by the battery is absorbed by the fluid in the shallow horizontal spiral coil, transferring some of the heat to the surrounding soil. Meanwhile, the U-shaped tube is dissipating heat deeper into the ground. Together, they form a heat dissipation channel from shallow to deep, enhancing the system's overall heat dissipation capacity and improving cooling efficiency. In winter, when the temperature of the shallow horizontal spiral coil rises due to the recovery of battery waste heat, this heat directly affects the soil temperature around the buried borehole, providing a preheating environment for the deep heat exchange loop. This preheats the fluid in the U-shaped tube, which then flows through a deeper U-shaped tube to further extract heat from the earth, thus reducing the extraction load of the ground source heat pump system, decreasing operating energy consumption, and improving the heating efficiency ratio. Furthermore, the system completes all processes—drilling, shallow coil laying, deep pipe installation, and backfilling—in one go, simultaneously addressing the needs of shallow waste heat recovery and deep heat exchange. This significantly shortens the construction cycle and saves on land area and the costs of repeated excavation.

[0025] In another embodiment of this application, the horizontal spiral coil and the U-shaped tube mainly exchange heat through the surrounding soil. To prevent the horizontal spiral coil and the U-shaped tube from being too close to each other during installation, which could lead to potential thermal short circuits and thermal interference risks, such as the shallow horizontal spiral coil absorbing battery waste heat directly baking the adjacent deep U-shaped tube, causing a thermal short circuit and affecting the heat dissipation efficiency of the U-shaped tube, this application also provides a heat insulation sleeve 3 (such as a nano-aerogel heat insulation sleeve). The heat insulation sleeve 3 is fitted around the inner tube 1 (U-shaped tube) and is located inside the outer tube 2 (horizontal spiral coil), reducing radial thermal interference between the shallow and deep layers and ensuring that the two heat exchange loops mainly work by exchanging heat with the soil in a more distant area.

[0026] In another embodiment of this application, the inner pipe 1 is a prefabricated high-density polyethylene pipe, which is usually straight when it leaves the factory. Therefore, the inner pipe 1 includes two vertical pipes 11, a U-shaped bend 12, and multiple fasteners 4. The two ends of the bend 12 are fixedly connected to the lower ends of the two vertical pipes 11 respectively. In this embodiment, a heat fusion butt connection is used to ensure the strength and sealing of the connection. The multiple fasteners 4 are arranged at intervals along the length of the vertical pipes 11 to fix the relative position of the two vertical pipes 11, so that they maintain a reasonable distance and prevent the two vertical pipes 11 from sticking together during the lowering process, which would affect the heat exchange effect. Secondly, a counterweight 13 is fixedly connected to the bend at the bottom of the bend 12 to help the pipe sink.

[0027] Reference Figure 2 and Figure 3The fixing component 4 includes a connecting rod 41, a telescopic rod 42, and two fixing rings 43. One fixing ring 43 is connected to the connecting rod 41, and the other fixing ring 43 is connected to the telescopic rod 42. The telescopic rod 42 is threaded through the end of the connecting rod 41. The two fixing rings 43 are respectively fixedly sleeved on the outside of the two vertical pipes 11. Thus, according to the set distance between the two vertical pipes 11, the total length of the telescopic rod 42 and the connecting rod 41 can be adjusted by rotating the telescopic rod 42 to keep the two vertical pipes 11 vertical in the buried hole.

[0028] To facilitate the lowering of the pipe by the crane, the connecting rod 41 and the telescopic rod 42 at the top of the vertical pipe 11 are respectively fixed with lifting lugs 44 at their opposite ends. The upper ends of the two lifting lugs 44 extend towards each other, so that the crane's lifting rope can be connected to the lifting lugs 44. At the same time as the pipe is lowered, water is filled into the U-shaped pipe to help the pipe sink and prevent the pipe from being flattened due to excessive external mud pressure. After the U-shaped pipe is lowered to the bottom of the hole, backfilling is carried out. The backfilling method adopts existing technology, so it will not be described in detail here.

[0029] The method of fixing the retaining ring 43 to the vertical tube 11 is described as follows: The connecting rod 41 and the telescopic rod 42 are respectively connected to the opposite ends of the connecting rod 41 and the telescopic rod 42. The two assembly blocks 5 are respectively connected to the two fixing rings 43. In order to facilitate the adjustment of the extension of the telescopic rod 42, the connecting rod 41 and the assembly block 5 are fixedly connected, while the telescopic rod 42 and the assembly block 5 are rotatably connected by bearings.

[0030] Reference Figure 3 The fixing ring 43 includes an arc-shaped retaining ring 431 and a retaining ring 432. One end of retaining ring 431 is rotatably connected to the assembly block 5, and one end of retaining ring 432 is rotatably connected to the assembly block 5. Retaining ring 431 and retaining ring 432 are respectively wrapped around both sides of the outside of the vertical pipe 11 and are tightly fitted to the vertical pipe 11. In this embodiment, rubber pads are glued to the inner sides of retaining ring 431 and retaining ring 432 to increase the friction between them and the outer wall of the vertical pipe 11. Retaining ring 431 and retaining ring 432 are on the same plane. One end of the ring 432 opposite to the assembly block 5 is fixedly connected to a horizontal fixing block 433. Both fixing blocks 433 have slots 434 extending horizontally through them. A locking block 435 slides through the slots 434. The locking block 435 is arranged in a horizontally placed U-shaped structure, with one end of the locking block 435 located in the slot 434 and the other end extending out of the slot 434 and horizontally extending towards the fixing block 433. By inserting the locking block 435 into the slots 434 of the two fixing blocks 433, the fixing ring 43 is fixed to the vertical pipe 11.

[0031] To prevent the inner pipe 1 from colliding with the side wall of the buried hole and scratching the pipe during the lowering process, a through hole is provided at one end of the locking block 435 that extends out of the locking groove 434 and faces the side wall of the buried hole. A spring 436 is fixedly embedded in the through hole. One end of the spring 436 is fixedly connected to the through hole, and the other end of the spring 436 extends out of the through hole and is exposed on the surface of the locking block 435 and is fixedly connected to a buffer block 437. The buffer block 437 is arc-shaped on the side facing the side wall of the buried hole. Thus, during the lowering process, if the inner pipe 1 approaches the side wall of the buried hole, the presence of the buffer block 437 will cause it to contact the buffer block 437 first, preventing the inner pipe 1 from making direct contact with the side wall of the buried hole and thus protecting the pipe and improving the heat conduction effect between the overall pipe and the surrounding soil.

[0032] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An integrated buried pipe heat exchange device based on a buried energy storage system, characterized in that, include: The inner tube (1) is filled with heat exchange fluid and is installed in a vertical buried hole pre-dug around or below the energy storage system. It serves as a deep heat exchange loop and is connected to a pre-set ground source heat pump system for summer heat dissipation and winter auxiliary heat extraction. The outer pipe (2) is filled with heat exchange fluid and laid when the buried hole is backfilled to a preset depth underground. It is set around the outside of the inner pipe (1) as a shallow waste heat recovery loop and is connected to the battery liquid cooling system of the energy storage system to absorb the waste heat generated by the energy storage system.

2. The integrated buried pipe heat exchanger based on a buried energy storage system according to claim 1, characterized in that: The outer tube (2) is a horizontal spiral coil structure and is arranged around the buried hole.

3. The integrated buried pipe heat exchanger based on a buried energy storage system according to claim 1, characterized in that: The inner tube (1) is a U-shaped tube structure.

4. The integrated buried pipe heat exchanger based on a buried energy storage system according to claim 1, 2, or 3, characterized in that: It also includes a heat insulation sleeve (3), which is sleeved around the inner tube (1) and located inside the outer tube (2).

5. The integrated buried pipe heat exchanger based on a buried energy storage system according to claim 3, characterized in that: The inner tube (1) includes two vertical tubes (11), a U-shaped bend (12) and multiple fasteners (4). The two ends of the bend (12) are fixedly connected to the lower ends of the two vertical tubes (11) respectively. The multiple fasteners (4) are arranged at intervals along the length of the vertical tubes (11) to fix the relative positions of the two vertical tubes (11).

6. The integrated buried pipe heat exchanger based on a buried energy storage system according to claim 5, characterized in that: The fixing component (4) includes a connecting rod (41), a telescopic rod (42), and two fixing rings (43). One fixing ring (43) is connected to the connecting rod (41), and the other fixing ring (43) is connected to the telescopic rod (42). The telescopic rod (42) is threaded through the connecting rod (41). The two fixing rings (43) are respectively fixedly sleeved on the outside of the two vertical pipes (11). The connecting rod (41) and the telescopic rod (42) fixed at the uppermost end of the vertical pipe (11) are respectively fixedly connected to the opposite ends of the connecting rod (41) and the telescopic rod (42), and the upper ends of the two lifting lugs (44) extend towards each other.

7. The integrated buried pipe heat exchanger based on a buried energy storage system according to claim 6, characterized in that: The fixing ring (43) includes a first retaining ring (431) and a second retaining ring (432). The connecting rod (41) and the telescopic rod (42) are respectively provided with assembly blocks (5) at their opposite ends. One end of the first retaining ring (431) is rotatably connected to the assembly block (5), and one end of the second retaining ring (432) is rotatably connected to the assembly block (5). The first retaining ring (431) and the second retaining ring (432) surround the outside of the vertical pipe (11). The ends of the first retaining ring (431) and the second retaining ring (432) opposite to the assembly block (5) are fixedly connected to a fixing block (433). Both fixing blocks (433) are provided with a slot (434) in the transverse direction. A locking block (435) slides through the slot (434).

8. The integrated buried pipe heat exchanger based on a buried energy storage system according to claim 7, characterized in that: One end of the card block (435) is located in the card slot (434), and the other end extends out of the card slot (434) with a spring (436) fixedly embedded on the side of the extended end facing the side wall of the underground hole. One end of the spring (436) extends out of the surface of the card block (435) and is fixedly connected to a buffer block (437). The buffer block (437) is arc-shaped on the side of the side wall of the underground hole.

9. The integrated buried pipe heat exchanger based on a buried energy storage system according to claim 5, characterized in that: A counterweight (13) is fixedly connected to the bottom bend of the elbow (12).

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