A serpentine tube heat exchanger for compressed air energy storage

Abstract

The utility model relates to the field of compressed air energy storage, concretely relates to a serpentine pipe heat exchanger for compressed air energy storage, including tubular casing, upper head and lower head, square fairlead is arranged in tubular casing, and its inside is arranged with multiple groups of heat exchange components arranged along the axial direction interval. Each group of heat exchange components contains multiple layers of heat exchange tube bundle, and realizes the even distribution and collection of fluid through the inlet coal joint box and the outlet coal joint box. Multiple groups of heat exchange components adopt modular layered layout, and are communicated through the communicating pipe between each group, and the balanced distribution of medium flow is ensured. The air inlet is provided with a gas distributor, so that the high-pressure air is uniformly dispersed and then enters the square fairlead. The design significantly reduces the air flow resistance through the full cross-flow heat exchange mode, and the joint box structure and modular layout simplify the manufacturing process, improve the maintainability of the equipment, and effectively solve the problems of large flow resistance, uneven heat exchange and difficult maintenance of the traditional heat exchanger.

Description

Technical Field

[0001] This utility model relates to the field of compressed air energy storage, specifically to a serpentine tube heat exchanger for compressed air energy storage. Background Technology

[0002] Compressed air energy storage, as a large-scale energy storage technology, has significant application value in areas such as power system peak shaving and renewable energy consumption. In compressed air energy storage systems, the heat exchanger is the core equipment for achieving efficient energy conversion, and its performance directly affects the system's energy storage efficiency and operational stability. Conventional serpentine tube heat exchangers have low space utilization, and while finned heat exchange tubes can enhance heat transfer, multi-layer stacking can easily lead to a sharp increase in flow resistance. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a serpentine tube heat exchanger for compressed air energy storage.

[0004] The technical solution of this utility model is as follows: This utility model provides a serpentine tube heat exchanger for compressed air energy storage, including a tubular shell, an upper end cap, and a lower end cap. The upper and lower ends of the tubular shell are sealed by the upper and lower end caps. A square guide tube is provided inside the tubular shell, and multiple sets of heat exchange components are provided inside the square guide tube. The multiple sets of heat exchange components are arranged at intervals along the axial direction of the tubular shell. An air inlet is provided on the upper end cap, and an air outlet is provided on the lower end cap.

[0005] Furthermore, the heat exchange assembly includes a multi-layer heat exchange tube bundle, a coal inlet header, and a coal outlet header. The multi-layer heat exchange tube bundle is arranged at intervals along the axial direction of the tubular shell. The heat exchange tube bundle includes several serpentine tubes located on the same horizontal plane. The serpentine tubes are arranged at intervals. The coal inlet end of each serpentine tube is connected to the coal inlet header, and the coal outlet end is connected to the coal outlet header.

[0006] Furthermore, the coal inlet header in the lowest heat exchange assembly is connected to the water inlet; the coal outlet header in the uppermost heat exchange assembly is connected to the water outlet.

[0007] Furthermore, the coal outlet header in the heat exchange assembly is connected to the coal inlet header in the adjacent heat exchange assembly above it via a connecting pipe; the coal inlet header in the heat exchange assembly is connected to the coal outlet header in the adjacent heat exchange assembly below it via a connecting pipe.

[0008] Furthermore, the coal inlet header and coal outlet header connected by the connecting pipe have their orthogonal projections in the axial direction coincide; high-pressure water enters the heat exchange component inside the square guide tube from the water inlet, and flows out from the water outlet after heat exchange; the flow of high-pressure water in the multi-layer heat exchange component is S-shaped in the axial direction.

[0009] Furthermore, the coal inlet header and coal outlet header in the heat exchange assembly are located at both ends of the same side wall of the square guide tube or arranged diagonally.

[0010] Furthermore, a gas distributor is provided below the air inlet, and the gas distributor has a perforated plate structure.

[0011] Furthermore, the tubular shell is connected to the square guide tube. The upper and lower ends of the area enclosed between the tubular shell and the square guide tube are provided with matching connecting plates. There are 8 connecting plates, which are used for the fixed connection between the square guide tube and the tubular shell and to form a directional channel for airflow.

[0012] Furthermore, the serpentine tube in the heat exchange assembly is provided with several fins.

[0013] The beneficial effects achieved by this utility model are as follows: This invention adopts a fully cross-flow heat exchange structure, with the airflow direction perpendicular to the heat exchange tube, which significantly reduces airflow resistance. At the same time, the multi-pass heat exchange design achieves efficient heat exchange between hot and cold fluids, reducing the heat exchange temperature difference.

[0014] This invention simplifies the manufacturing process by replacing the traditional tube sheet design with a header, and also realizes a modular, layered layout of the heat exchange tube bundle. The coal inlet header and coal outlet header realize the distribution and collection of fluid, ensuring that the fluid flow is balanced in each heat exchange tube and avoiding local flow dead zones.

[0015] This invention's heat exchange components for adjacent layers dynamically balance the interlayer medium flow through connecting pipes, eliminating localized overheating or undercooling and ensuring uniform heat exchange. This design also facilitates segmented maintenance, significantly improving equipment maintainability.

[0016] The outer tubular shell of this invention has an embedded square guide tube that matches the outer dimensions of the heat exchange components, forming a directional channel for airflow, increasing the air velocity in the shell side, reducing leakage rate, and thus improving the heat transfer coefficient.

[0017] This utility model has a gas distributor installed below the air inlet, which disperses the high-pressure air into multiple fine streams through a perforated plate, so that the air forms a stable and uniform velocity field when it enters the square guide tube. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a utility model Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the structure of the square guide tube, heat exchange component, and tubular shell of this utility model.

[0019] In the picture, 100. Tubular shell; 101. Upper head; 102. Lower head; 200. Square guide tube; 300. Heat exchanger assembly; 301. Coal inlet header; 302. Coal outlet header; 303. Heat exchanger tube bundle; 304. Serpentine tube; 401. Inlet; 402. Outlet; 501. Air Inlet; 502. Air Outlet; 600. Gas distributor; 700. Connecting pipe; 800, connecting plate. Detailed Implementation

[0020] To facilitate understanding of this utility model by those skilled in the art, the specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0021] Please refer to Figures 1-3 This utility model provides a serpentine tube 304 heat exchanger for compressed air energy storage, comprising a tubular shell 100, an upper end cap 101, and a lower end cap 102. The upper and lower ends of the tubular shell 100 are sealed by the upper end cap 101 and the lower end cap 102. An air inlet 501 is provided on the upper end cap 101, and an air outlet 502 is provided on the lower end cap 102. A gas distributor 600 is provided below the air inlet 501. The gas distributor 600 has a perforated plate structure. A square guide tube 200 is provided inside the tubular shell 100, and the tubular shell 100 is connected to the outside. Eight connecting plates 800 are provided at the upper and lower ends of the area enclosed between the square guide tube 200 and the tubular shell 100. These connecting plates are used for the fixed connection between the square guide tube 200 and the tubular shell 100. Furthermore, the connecting plates 800 prevent air from entering or allow only a small amount of air to enter the area enclosed between the square guide tube 200 and the tubular shell 100. The connecting plates 800 are welded to the square guide tube 200 and the tubular shell 100. Compressed air enters the shell side of the square guide tube 200 from the air inlet 501 through the gas distributor 600. The gas distributor 600 disperses the high-pressure air into multiple fine streams, creating a stable and uniform velocity field as the air enters the square guide tube 200. After heat exchange in the shell side of the square guide tube 200, the compressed air flows out from the air outlet 502.

[0022] The square guide tube 200 has multiple sets of heat exchange components 300 arranged axially. Each set of heat exchange components 300 includes a multi-layer heat exchange tube bundle 303, a coal inlet header 301, and a coal outlet header 302. The multi-layer heat exchange tube bundle 303 is arranged axially, and each layer of heat exchange tube bundle 303 includes several serpentine tubes 304 located on the same horizontal plane. The serpentine tubes 304 are arranged at intervals and have several fins. The arrangement of the heat exchange components 300 not only achieves efficient heat exchange of hot and cold fluids and reduces the heat exchange temperature difference through multi-pass heat exchange design, but also simplifies the manufacturing process by replacing the traditional tube sheet design with headers, and realizes the modular layered layout of the heat exchange tube bundle 303.

[0023] Each serpentine tube 304 has its coal inlet end connected to a coal inlet header 301, and its coal outlet end connected to a coal outlet header 302. The coal inlet header 301 and coal outlet header 302 in each heat exchange assembly 300 are located at both ends or diagonally opposite each other on the same side wall of the square guide tube 200. The outer circumferential shape of the multi-layer heat exchange assembly 300 matches the inner wall shape of the square guide tube 200 to achieve the effect of the square guide tube 200 wrapping the heat exchange assembly 300. Cable ties can be used to fix the relative position of the heat exchange assembly 300 and the square guide tube 200. A directional channel for airflow is formed inside the shell side of the square guide tube 200, which increases the shell side airflow velocity and improves the heat transfer coefficient.

[0024] The coal inlet manifold 301 in the lowest heat exchange component 300 of the square guide tube 200 is connected to the water inlet 401, and the coal outlet manifold 302 in the uppermost heat exchange component 300 is connected to the water outlet 402. The coal outlet manifold 302 in the heat exchange component 300 is connected to the coal inlet manifold 301 in the adjacent heat exchange component 300 above it through a connecting pipe 700, and the coal inlet manifold 301 in the heat exchange component 300 is connected to the coal outlet manifold 302 in the adjacent heat exchange component 300 below it through a connecting pipe 700. The adjacent coal inlet header 301 and coal outlet header 302 have their orthogonal projections in the axial direction coincide. High-pressure water can enter the square guide tube 200 from the water inlet 401, flow through the headers and heat exchange tube bundles 303 in the multi-layer heat exchange assembly 300, and flow out from the water outlet 402 after heat exchange. The flow of high-pressure water in the multi-layer heat exchange assembly 300 in the square guide tube 200 is S-shaped in the axial direction. The interlayer medium flow rate of each heat exchange assembly 300 is dynamically balanced through the connecting pipe 700 to eliminate local overheating or undercooling and ensure heat exchange uniformity. This design also facilitates segmented maintenance and greatly improves equipment maintainability.

[0025] Work process: Energy storage: High-temperature compressed air flows into the shell side of the square guide tube 200 through the air inlet 501 and exchanges heat with the heat exchange medium that enters the heat exchange component 300 through the water inlet 401. The heat exchange medium is heated by the compressed air, and the compressed air flows out from the air outlet 502; the heated heat exchange medium flows out from the water outlet 402.

[0026] Energy release: Low-temperature compressed air flows into the shell side of the square guide tube 200 through the air inlet 501 and exchanges heat with the heat exchange medium that enters the heat exchange component 300 through the water inlet 401. The heat exchange medium is cooled by the compressed air, and the compressed air flows out from the air outlet 502; the cooled heat exchange medium flows out from the water outlet 402.

[0027] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A serpentine tube (304) heat exchanger for compressed air energy storage, comprising a tubular shell (100), an upper end cap (101), and a lower end cap (102), wherein the upper and lower ends of the tubular shell (100) are sealed by the upper end cap (101) and the lower end cap (102), characterized in that: The tubular shell (100) is provided with a square guide tube (200), and the square guide tube (200) is provided with multiple sets of heat exchange components (300). The multiple sets of heat exchange components (300) are arranged at intervals along the axial direction of the tubular shell (100). The upper end cap (101) is provided with an air inlet (501), and the lower end cap (102) is provided with an air outlet (502).

2. The serpentine tube (304) heat exchanger for compressed air energy storage according to claim 1, characterized in that: The heat exchange assembly (300) includes a multi-layer heat exchange tube bundle (303), a coal inlet header (301), and a coal outlet header (302). The multi-layer heat exchange tube bundle (303) is arranged at intervals along the axial direction of the tubular shell (100). The heat exchange tube bundle (303) includes a number of serpentine tubes (304) located on the same horizontal plane. The serpentine tubes (304) are arranged at intervals. The coal inlet end of each serpentine tube (304) is connected to the coal inlet header (301), and the coal outlet end is connected to the coal outlet header (302).

3. A serpentine tube (304) heat exchanger for compressed air energy storage according to claim 2, characterized in that: The coal inlet manifold (301) in the lowest heat exchange assembly (300) is connected to the water inlet (401); the coal outlet manifold (302) in the uppermost heat exchange assembly (300) is connected to the water outlet (402).

4. A serpentine tube (304) heat exchanger for compressed air energy storage according to claim 3, characterized in that: The coal outlet manifold (302) in the heat exchange assembly (300) is connected to the coal inlet manifold (301) in the adjacent heat exchange assembly (300) above it via a connecting pipe (700); the coal inlet manifold (301) in the heat exchange assembly (300) is connected to the coal outlet manifold (302) in the adjacent heat exchange assembly (300) below it via a connecting pipe (700).

5. A serpentine tube (304) heat exchanger for compressed air energy storage according to claim 4, characterized in that: The coal inlet header (301) and coal outlet header (302) connected by the connecting pipe (700) have their orthogonal projections in the axial direction coincide; high-pressure water enters the heat exchange component (300) inside the square guide tube (200) from the water inlet (401), and flows out from the water outlet (402) after heat exchange; the flow of high-pressure water in the multi-layer heat exchange component (300) is S-shaped along the axial direction of the tubular shell (100).

6. A serpentine tube (304) heat exchanger for compressed air energy storage according to claim 2, characterized in that: The coal inlet header (301) and coal outlet header (302) in the heat exchange assembly (300) are located at both ends or diagonally opposite each other on the same side wall of the square guide tube (200).

7. A serpentine tube (304) heat exchanger for compressed air energy storage according to claim 1, characterized in that: A gas distributor (600) is provided below the air inlet (501), and the gas distributor (600) is a perforated plate structure.

8. A serpentine tube (304) heat exchanger for compressed air energy storage according to claim 1, characterized in that: The tubular shell (100) is externally connected to the square guide tube (200). The upper and lower ends of the area enclosed between the tubular shell (100) and the square guide tube (200) are provided with matching connecting plates (800). There are 8 connecting plates (800) for fixing the square guide tube (200) and the tubular shell (100). With the setting of the connecting plates (800), air will not enter or only a small amount will enter the area enclosed between the square guide tube (200) and the tubular shell (100).

9. A serpentine tube (304) heat exchanger for compressed air energy storage according to claim 1, characterized in that: The heat exchange assembly (300) has a number of fins on its serpentine tube (304).

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