A heat exchange tube assembly for a thermal storage device

Abstract

The application relates to the field of heat storage equipment, in particular to a heat exchange pipe assembly for heat storage equipment, which comprises a heat exchange pipe bundle, a pipe plate and a pipe cover, the heat exchange pipe bundle is inserted and installed on the pipe plate, the pipe cover is detachably connected with the pipe plate, a medium inflow cavity and a medium outflow cavity are separated between the pipe cover and the pipe plate, a part of ports of the heat exchange pipe bundle is communicated with the medium inflow cavity, another part of ports is communicated with the medium outflow cavity, a filter screen is arranged in the medium inflow cavity, and the filter screen is detachably connected with the pipe cover. The flow-through cavity is divided into independent medium inflow cavity and medium outflow cavity through the separation plate in the pipe cover, directional flow of heat exchange medium is ensured, and flow mixing is avoided; meanwhile, a guide plate is additionally arranged in the medium inflow cavity, the circular arc part of the guide plate can reduce the flow resistance of the medium, the inclined part guides the medium to diffuse to the pipe plate direction, the guide hole further realizes uniform distribution of the medium, the medium can fully cover all the pipe opening sections of the U-shaped pipe body, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of thermal storage equipment, and in particular to a heat exchange tube assembly for thermal storage equipment. Background Technology

[0002] With the rapid development of new energy power generation (such as solar thermal and wind power), industrial waste heat recovery, and building heating, thermal storage equipment, as a core device for energy storage and supply-demand balance, directly affects the overall system's energy efficiency through its heat exchange efficiency and operational stability. Heat exchanger tube assemblies are key components for achieving the heat storage-heat release cycle in thermal storage equipment.

[0003] The problem with existing heat exchanger tube assemblies used in thermal storage equipment is that most heat exchanger tube assemblies do not have reasonable partitioning and flow guiding structures in the medium flow chamber. After the external heat exchange medium enters the chamber, it is easy to cause local accumulation, which leads to some heat exchanger tube bundles not being able to fully contact the medium, and the medium flow resistance is large, making it difficult to improve the overall heat exchange efficiency.

[0004] Furthermore, the external heat exchange medium often contains impurities (such as pipe rust debris and dust). Existing components lack a filtration structure, and impurities can easily enter the heat exchange tube bundle, causing pipe blockage or scaling on the tube wall, further reducing heat exchange efficiency. Utility Model Content

[0005] In order to reduce the flow resistance when the medium enters the heat exchange tube assembly and improve the heat exchange efficiency, this application provides a heat exchange tube assembly for a thermal storage device.

[0006] The heat exchange tube assembly for thermal storage equipment provided in this application adopts the following technical solution:

[0007] A heat exchange tube assembly for a thermal storage device is disclosed. The heat exchange tube assembly extends into the thermal storage device and its end is connected to the side wall of the thermal storage device. The heat exchange tube assembly includes a heat exchange tube bundle, a tube sheet, and a tube cap. The heat exchange tube bundle is inserted into the tube sheet, and the tube cap is detachably connected to the tube sheet. A medium inflow chamber and a medium outflow chamber are separated between the tube cap and the tube sheet. A portion of the heat exchange tube bundle is connected to the medium inflow chamber, and another portion of the tube bundle is connected to the medium outflow chamber. A filter screen is provided in the medium inflow chamber, and the filter screen is detachably connected to the tube cap.

[0008] Optionally, the tube sheet has a plurality of tube sheet perforations, which are symmetrically distributed along the centerline of the tube sheet. The heat exchange tube bundle includes multiple U-shaped tubes, and the two ends of each U-shaped tube are respectively inserted into two tube sheet perforations symmetrically distributed along the centerline of the tube sheet.

[0009] Optionally, several tie rods are fixed on the side of the tube sheet away from the tube cover. The tie rods are evenly distributed around the outer periphery of the heat exchange tube bundle and extend along the length of the heat exchange tube bundle. A support plate is provided on the tie rod. The support plate has support plate through holes corresponding to the heat exchange tube bundle. Straight tube sections of the heat exchange tube bundle pass through the support plate through holes.

[0010] Optionally, a partition plate is provided on the side of the tube cover facing the tube sheet. The partition plate extends in a direction perpendicular to the plane of the tube sheet. The medium inflow chamber and the medium outflow chamber are respectively formed on both sides of the partition plate. One side of the filter screen is detachably connected to the tube cover, and the other side is detachably connected to the partition plate.

[0011] Optionally, the pipe cover is further provided with a medium inlet and a medium outlet that connect the medium inflow chamber and the medium outflow chamber, respectively. A guide plate is installed on the side of the partition plate facing the medium inlet. The guide plate includes a vertical part and an inclined part. The vertical part is parallel to the partition plate and is distributed at intervals. The two are connected by fasteners. One end of the inclined part extends into the vertical part, and the other end extends into the inside of the pipe cover and is inclined towards the pipe plate.

[0012] Optionally, the partition plate further includes an arc portion, which is disposed between the vertical portion and the inclined portion to smoothly connect the vertical portion and the inclined portion. A guide hole is provided on the inclined portion, and the axis of the guide hole extends vertically.

[0013] Optionally, a mounting base communicating with the interior is formed on one side of the thermal storage device. Interconnected holes are respectively opened on the outer periphery of the mounting base, the pipe cover and the tube sheet. A sleeve is embedded in the hole and a bolt is threaded into the sleeve.

[0014] Optionally, the tube sheet has pre-reserved sealing grooves on both sides facing the tube cover and the mounting base, and a sealing gasket is provided in the sealing groove.

[0015] In summary, this application includes at least one of the following beneficial technical effects:

[0016] 1. The heat exchange tube assembly divides the flow chamber into an independent medium inflow chamber and a medium outflow chamber through a partition plate inside the tube cover, ensuring directional flow of the heat exchange medium and preventing cross-flow. At the same time, a guide plate is added to the medium inflow chamber. The arc part of the guide plate can reduce the medium flow resistance, and the inclined part guides the medium to diffuse towards the tube sheet. The guide holes further realize the uniform distribution of the medium, so that the medium can fully cover all the tube openings of the U-shaped tube body and improve the heat exchange efficiency.

[0017] 2. By installing a detachable filter screen in the medium inflow chamber, impurities in the heat exchange medium can be effectively filtered, preventing impurities from entering the tube bundle and causing blockage or scaling, thus ensuring unobstructed heat exchange channels. Attached Figure Description

[0018] Figure 1 This is a frontal cross-sectional structural diagram of an embodiment of this application.

[0019] Figure 2 This is a side view cross-sectional structural diagram of an embodiment of this application.

[0020] Figure 3 This is a top cross-sectional structural diagram of an embodiment of this application.

[0021] Figure 4 yes Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0022] Figure 5 yes Figure 3 Enlarged schematic diagram of the structure at point B.

[0023] Reference numerals: 1. Thermal storage equipment; 2. Heat exchanger tube assembly; 21. Heat exchanger tube bundle; 211. U-shaped tube body; 22. Tube sheet; 23. Tube cover; 231. Medium inlet; 232. Medium outlet; 24. Medium inflow chamber; 25. Medium outflow chamber; 26. Filter screen; 27. Tie rod; 28. Support plate; 29. ​​Divider plate; 30. Guide plate; 301. Vertical part; 302. Arc part; 303. Inclined part; 304. Guide hole; 3. Mounting base; 4. Sleeve; 5. Bolt; 6. Sealing gasket. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0025] This application discloses a heat exchange tube assembly for a thermal storage device, used to exchange heat with the thermal storage device 1. The thermal storage device 1 is a cylindrical or square sealed container (used to store high-temperature media). The heat exchange tube assembly 2 serves as the core structure for heat exchange, with its main body extending into the interior of the thermal storage device 1 and its end fixedly connected to the side wall of the thermal storage device 1, thereby realizing the heat transfer between the internal medium and the external heat exchange medium of the thermal storage device 1.

[0026] Reference Figure 1 The core function of the heat exchange tube assembly 2 is achieved by the coordinated action of three components: heat exchange tube bundle 21, tube sheet 22, and tube cover 23. The tube sheet 22 serves as the connection base between the heat exchange tube assembly 2 and the heat storage device 1. It is a circular metal plate (the size of which matches the opening of the side wall of the heat storage device 1) used to fix subsequent components and isolate the internal and external media of the heat storage device 1. The heat exchange tube bundle 21, as the core carrier of heat exchange, needs to be installed on the tube sheet 22. Its main body extends into the interior of the heat storage device 1 and exchanges heat with the internal media of the heat storage device 1 through the tube wall. The tube cover 23 is a box-shaped metal structure with one open end. The open end is detachably connected to the tube sheet 22 (such as by bolts) and is used to cover the outside of the tube sheet 22 to form a flow chamber for the heat exchange medium.

[0027] Based on the fixing function of the tube sheet 22, a number of tube sheet perforations are opened on the tube sheet 22. The diameter of the perforations matches the outer diameter of the tube opening of the heat exchange tube bundle 21. All perforations are symmetrically distributed along the radial centerline of the tube sheet 22 to ensure uniform flow of the subsequent heat exchange medium.

[0028] The heat exchange tube bundle 21 adapted to the perforation consists of multiple U-shaped tubes 211 (made of high-temperature resistant stainless steel, suitable for the high-temperature environment inside the heat storage equipment 1): the two pipe ends of each U-shaped tube 211 (i.e. the straight pipe ends of the U-shaped structure) are respectively inserted into two perforations symmetrically along the center line on the tube sheet 22. The pipe ends are sealed and fixed to the inner wall of the perforation by expansion and welding to prevent leakage between the medium inside the heat storage equipment 1 and the external heat exchange medium.

[0029] Since the main body of the heat exchange tube bundle 21 extends into the heat storage device 1, it is prone to shaking due to the flow of the medium or temperature changes inside the heat storage device 1. To improve the stability of the heat exchange tube bundle 21, a stabilizing structure is set up: several tie rods 27 are welded and fixed on the side of the tube sheet 22 away from the tube cover 23 (i.e., the side facing the inside of the heat storage device 1). The tie rods 27 are evenly distributed along the outer periphery of the heat exchange tube bundle 21 (e.g., spaced at 60° intervals along the circumference of the tube sheet 22), and the extension direction is consistent with the length direction of the heat exchange tube bundle 21 (the straight section direction of the U-shaped tube body 211), serving as a support foundation.

[0030] Reference Figure 1 and Figure 3 Two to three support plates 28 are installed on the tie rod 27 (the specific number is adapted to the length of the heat exchange tube bundle 21), and support plate through holes corresponding to the heat exchange tube bundle 21 are opened on the support plates 28 (the hole diameter is slightly larger than the outer diameter of the straight pipe section of the U-shaped tube body 211), so that the straight pipe section of the U-shaped tube body 211 is inserted into the through holes.

[0031] To achieve directional flow of the heat exchange medium, based on the connection structure between the tube cover 23 and the tube sheet 22, a partition plate 29 is welded to the inner wall of the tube cover 23 facing the tube sheet 22. The partition plate 29 extends in a direction perpendicular to the plane of the tube sheet 22 (i.e., the depth direction of the tube cover 23), and its length is consistent with the inner length of the tube cover 23, dividing the chamber between the tube cover 23 and the tube sheet 22 into an independent medium inflow chamber 24 and a medium outflow chamber 25.

[0032] In the heat exchange tube bundle 21, the U-shaped tube body 211 located on one side of the centerline of the tube sheet 22 is connected to the medium inflow chamber 24, and the tube body on the other side is connected to the medium outflow chamber 25, so that the heat exchange medium enters the tube bundle from the medium inflow chamber 24 and is discharged from the medium outflow chamber 25 after heat exchange.

[0033] Reference Figure 3 and Figure 4A filter screen 26 (made of metal woven mesh, with the mesh size selected according to the particle size of the impurities in the medium) is added inside the medium inflow chamber 24. One side of the filter screen 26 is detachably connected to the inner wall of the pipe cover 23 by screws, and the other side is detachably connected to the side wall of the partition plate 29 by screws, which facilitates later maintenance.

[0034] Medium inlet 231 and medium outlet 232 are welded to the outer wall of the tube cover 23 respectively. Medium inlet 231 is connected to medium inflow chamber 24 and is used to input the medium to be heat exchanged; medium outlet 232 is connected to medium outflow chamber 25 and is used to discharge the medium after heat exchange.

[0035] Reference Figure 4 To avoid uneven distribution of the medium within the medium inflow cavity 24, a guide plate 30 is added based on the partition plate 29 (installed on the side of the partition plate 29 facing the medium inlet). The guide plate 30 is an integrally formed structure, including a vertical part 301, an arc part 302, and an inclined part 303. The vertical part 301 serves as the fixed base for the guide plate 30, is parallel to the partition plate 29 and spaced at a certain distance, and is fixed to the partition plate 29 by fasteners. The arc part 302 is used to reduce the resistance to medium flow and is connected to the outside of the vertical part 301 to achieve a smooth transition in the direction of medium flow. The end of the arc part 302 away from the vertical part 301 is connected to the inclined part 303. The inclined part 303 extends towards the inner wall of the tube cover 23 and is inclined towards the tube plate 22 (inclination angle 30°-45°), guiding the medium to flow towards the tube plate 22.

[0036] To further optimize the medium distribution, several guide holes 304 are opened on the inclined part 303. The axis of the guide holes extends vertically (perpendicular to the plane of the tube sheet 22) to ensure that the medium enters the pipe opening section of each U-shaped tube body 211 evenly.

[0037] Reference Figure 5 To achieve a stable connection between the heat exchange tube assembly 2 and the thermal storage device 1, based on the connection requirements between the thermal storage device 1 and the tube sheet 22, a mounting base 3 is welded to the side wall of the thermal storage device 1 at the position corresponding to the heat exchange tube assembly 2. The mounting base 3 has an annular boss structure and serves as a support carrier for the tube sheet 22. Several interconnected holes are evenly distributed along the circumferential edges of the mounting base 3, the tube cover 23, and the tube sheet 22, serving as fixing channels. To enhance the thread strength of the holes, a sleeve 4 is interference-fitted into each hole, and the inner wall of the sleeve 4 has internal threads. A bolt 5 is passed through the sleeve 4 and threaded into the internal threads. Tightening the bolt 5 secures the mounting base 3, the tube sheet 22, and the tube cover 23, achieving a stable connection between the heat exchange tube assembly 2 and the thermal storage device 1.

[0038] On both sides of the tube sheet 22 (the side facing the tube cover 23 and the side facing the mounting base 3), there are pre-reserved annular sealing grooves. The cross-section of the annular sealing groove is rectangular. A sealing gasket 6 (made of fluororubber or graphite composite gasket, with a size that matches the sealing groove) is placed in the sealing groove. The sealing gasket 6 is compressed by the tightening force of the bolt 5 to fill the gap between the connecting surfaces, thereby achieving a seal between the tube sheet 22 and the tube cover 23, and between the tube sheet 22 and the mounting base 3, to prevent media leakage.

[0039] 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. A heat exchange tube assembly for a thermal storage device, the heat exchange tube assembly extending into the thermal storage device and having its end connected to the side wall of the thermal storage device, characterized in that: The heat exchange tube assembly includes a heat exchange tube bundle, a tube sheet, and a tube cap. The heat exchange tube bundle is inserted into the tube sheet, and the tube cap is detachably connected to the tube sheet. A medium inflow chamber and a medium outflow chamber are separated between the tube cap and the tube sheet. A portion of the heat exchange tube bundle is connected to the medium inflow chamber, and another portion of the tube bundle is connected to the medium outflow chamber. A filter screen is provided in the medium inflow chamber, and the filter screen is detachably connected to the tube cap.

2. A heat exchange tube assembly for a thermal storage device according to claim 1, characterized in that: The tube sheet has a plurality of tube sheet perforations, which are symmetrically distributed along the centerline of the tube sheet. The heat exchange tube bundle includes multiple U-shaped tubes, and the two ends of each U-shaped tube are respectively inserted into two tube sheet perforations symmetrically distributed along the centerline of the tube sheet.

3. A heat exchange tube assembly for a thermal storage device according to claim 1, characterized in that: Several tie rods are fixed on the side of the tube sheet away from the tube cover. The tie rods are evenly distributed around the outer periphery of the heat exchange tube bundle and extend along the length of the heat exchange tube bundle. A support plate is provided on the tie rod. The support plate has a support plate through hole corresponding to the heat exchange tube bundle. The straight tube section of the heat exchange tube bundle passes through the support plate through hole.

4. A heat exchange tube assembly for a thermal storage device according to claim 1, characterized in that: A partition plate is provided on the side of the tube cover facing the tube plate. The partition plate extends in a direction perpendicular to the plane of the tube plate. The medium inflow chamber and the medium outflow chamber are respectively formed on both sides of the partition plate. One side of the filter screen is detachably connected to the tube cover, and the other side is detachably connected to the partition plate.

5. A heat exchange tube assembly for a thermal storage device according to claim 4, characterized in that: The tube cover is also formed with a medium inlet and a medium outlet that connect the medium inflow chamber and the medium outflow chamber, respectively. A guide plate is installed on the side of the partition plate facing the medium inlet. The guide plate includes a vertical part and an inclined part. The vertical part is parallel to the partition plate and is distributed at intervals. The two are connected by fasteners. One end of the inclined part extends into the vertical part, and the other end extends into the inside of the tube cover and is inclined towards the tube plate.

6. A heat exchange tube assembly for a thermal storage device according to claim 5, characterized in that: The partition plate also includes an arc portion, which is disposed between the vertical portion and the inclined portion, smoothly connecting the vertical portion and the inclined portion. A guide hole is provided on the inclined portion, and the axis of the guide hole extends vertically.

7. A heat exchange tube assembly for a thermal storage device according to claim 1, characterized in that: The thermal storage device has a mounting base on one side that communicates with its interior. The mounting base, the pipe cover, and the tube sheet are respectively provided with interconnected holes. A sleeve is embedded in the hole and a bolt is threaded into the sleeve.

8. A heat exchange tube assembly for a thermal storage device according to claim 7, characterized in that: The tube sheet has pre-drilled sealing grooves on both sides facing the tube cover and the mounting base, and a sealing gasket is provided in the sealing groove.

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