A detachable molten salt heat exchange mechanism and a phase change heat exchange device

Abstract

The application relates to a detachable molten salt heat exchange mechanism and a phase change heat exchange device, and relates to the technical field of phase change heat storage, which comprises an outer shell, a mounting shell and an upper head, the upper head is detachably arranged at a mounting port of the mounting shell, a phase change heat exchange pipe is partially inserted into the mounting shell through the mounting port, the opening of the phase change heat exchange pipe is towards the upper head, the phase change heat exchange pipe is internally filled with molten salt and is used for absorbing heat energy, the diameter of the opening end of the phase change heat exchange pipe is larger than the diameter of the part inserted into the mounting shell and is larger than the inner diameter of the mounting shell, and the mounting shell and the upper head are matched to clamp the opening end of the phase change heat exchange pipe. Since the opening end of the phase change heat exchange pipe is clamped on the upper end of the mounting shell and the upper head is pressed on the side of the opening end of the phase change heat exchange pipe away from the mounting shell, the action of being matched and clamped is realized, when the phase change heat exchange pipe is detached, only the upper head needs to be detached, and the phase change heat exchange pipe is integrally lifted and taken out, so that the structure is simple, and the problem that the existing technology is difficult to quickly detach is solved.

Description

Technical Field

[0001] This utility model relates to the field of phase change thermal energy storage technology, specifically to a detachable molten salt heat exchange mechanism and a phase change thermal energy device. Background Technology

[0002] Thermal energy is the most widely used form of energy, but the time and quantity of thermal energy users and suppliers often differ. Against this backdrop, energy storage technology has emerged. Thermal energy storage mainly includes sensible heat storage and phase change storage. Sensible heat storage, based on the temperature, mass, and specific heat capacity of materials, has advantages such as simple structure and low cost, but its energy density is relatively low. Phase change thermal storage, due to its compact device size and high energy density, has shown strong appeal and is considered one of the most promising energy storage technologies at present. It is currently widely used in industrial waste heat recovery, grid peak shaving, and building energy conservation.

[0003] In the prior art, such as the molten salt thermal storage device with patent number CN107421121A, there is a shell, an inlet pipe, an outlet pipe, and multiple thermal storage and heat exchange units. The shell contains multiple thermal storage and heat exchange units, each including a heating unit, a thermal storage pipe, and a water flow channel. The heating unit and the thermal storage pipe are in contact with the water flow channel, which has an inlet and an outlet. The inlet and outlet pipes pass through the shell and are connected to the inlet and outlet of the water flow channel, respectively. This invention uses molten salt as the thermal storage medium, which has the advantages of high heat storage density, large phase change heat, and good thermal conductivity. The heating device does not directly contact the thermal storage medium, making it safe and reliable.

[0004] However, the existing molten salt thermal storage devices are difficult to disassemble and replace, and the heat exchange units are difficult to remove quickly from the shell, resulting in a problem of slow disassembly. Utility Model Content

[0005] This application provides a detachable molten salt heat exchange mechanism and a phase change heat exchange device, which can solve the problem that the existing molten salt heat storage device is difficult to disassemble and replace the heat storage and heat exchange unit, and is difficult to quickly detach from the shell, thus having a problem with rapid disassembly.

[0006] In a first aspect, embodiments of this application provide a detachable molten salt heat exchange mechanism, comprising: The housing includes a mounting shell and an upper end cap, the upper end cap being detachably disposed at the mounting opening of the mounting shell; A phase change heat pipe is provided, part of which passes through the mounting port and extends into the mounting shell. The opening of the phase change heat pipe faces the upper end cap and is filled with molten salt for absorbing heat energy. The diameter of the opening end of the phase change heat pipe is larger than the diameter of the part extending into the mounting shell and larger than the inner diameter of the mounting shell. The mounting shell and the upper end cap cooperate to hold the opening end of the phase change heat pipe.

[0007] In one embodiment, the phase change heat pipe fitting includes a first fixed tube sheet and a plurality of heat exchange tubes. The open ends of the plurality of heat exchange tubes all pass through the first fixed tube sheet and are connected to the first fixed tube sheet. The other end of the heat exchange tube extends into the mounting shell. The heat exchange tube is filled with molten salt. The diameter of the first fixed tube sheet is larger than the inner diameter of the mounting shell. The mounting shell and the upper end cap cooperate to hold the first fixed tube sheet.

[0008] In one embodiment, the mounting shell includes a mounting tube shell and a lower end cap, the lower end of the heat exchange tube passes through the mounting tube shell and extends into the lower end cap, and both ends of the mounting tube shell are detachably connected to the upper end cap and the lower end cap, respectively.

[0009] In one embodiment, a plug is provided at one end of the heat exchange tube facing the lower end cap. The plug is detachably connected to the heat exchange tube. When it is necessary to replace the molten salt filling inside, the plug is removed to release the molten salt filling inside.

[0010] In one embodiment, the end of the mounting tube shell near the upper end cap is provided with a steam inlet, and the end of the lower end cap away from the mounting tube shell is provided with a steam condensate outlet. When heat exchange is performed, steam enters from the steam inlet, and after heat exchange through the heat exchange tube, it forms steam condensate, which is then discharged through the steam condensate outlet.

[0011] In one embodiment, the phase change heat pipe further includes a second fixed tube sheet, the diameter of which is smaller than the inner diameter of the mounting shell. The second fixed tube sheet is located inside the mounting shell, and one end of the heat exchange tube extends into the mounting shell, passes through the second fixed tube sheet, and is connected to the second fixed tube sheet.

[0012] In one embodiment, heat exchange fins are provided on the outer side of the heat exchange tube wall.

[0013] In one embodiment, the plurality of heat exchange tubes are arranged in a bundle.

[0014] In one embodiment, the upper end cap is provided with a molten salt inlet at the end away from the mounting shell.

[0015] Secondly, embodiments of this application also provide a phase change heat exchange device, which includes the aforementioned detachable molten salt heat exchange mechanism.

[0016] The beneficial effects of the technical solutions provided in this application include: In designing this detachable molten salt heat exchange mechanism, the upper end cap is detachably mounted at the mounting port of the mounting shell. The phase change heat exchange tube portion passes through the mounting port and extends into the mounting shell, with the opening of the phase change heat exchange tube facing the upper end cap and filled with molten salt for absorbing heat energy. The diameter of the opening end of the phase change heat exchange tube is larger than the diameter of the portion extending into the mounting shell and also larger than the inner diameter of the mounting shell. The mounting shell and the upper end cap cooperate to hold the opening end of the phase change heat exchange tube. Since the opening end of the phase change heat exchange tube is held at the upper end of the mounting shell, and the upper end cap presses against the side of the opening end of the phase change heat exchange tube away from the mounting shell, a cooperating holding action is achieved. When disassembling the phase change heat exchange tube, only the upper end cap needs to be removed, and the entire phase change heat exchange tube can be lifted out. The structure is simple and solves the problem that in existing molten salt thermal storage devices, disassembling and replacing the thermal storage and heat exchange unit is cumbersome and difficult to quickly detach from the shell, resulting in difficulty in rapid disassembly. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an embodiment of a detachable molten salt heat exchange mechanism according to the present invention.

[0019] In the diagram: 1. Outer shell; 11. Mounting shell; 111. Mounting tube shell; 112. Lower end cap; 12. Upper end cap; 2. Phase change heat exchange tube; 21. First fixed tube sheet; 22. Heat exchange tube; 221. Plug; 222. Heat exchange fins; 23. Second fixed tube sheet; 3. Steam inlet; 4. Steam condensate outlet; 5. Molten salt inlet. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0021] This application provides a detachable molten salt heat exchange mechanism and a phase change heat exchange device, which can solve the problem that in the prior art, the existing molten salt heat storage device is difficult to disassemble and replace the heat storage and heat exchange unit, and it is difficult to quickly detach it from the shell, resulting in difficulty in quick disassembly.

[0022] like Figure 1 As shown, in one aspect, this application provides a detachable molten salt heat exchange mechanism, which includes: The outer casing 1 includes a mounting shell 11 and an upper end cap 12, the upper end cap 12 being detachably disposed at the mounting opening of the mounting shell 11; The phase change heat pipe 2 has a portion that passes through the mounting port and extends into the mounting shell 11. The opening of the phase change heat pipe 2 faces the upper end cap 12 and is filled with molten salt for absorbing heat energy. The diameter of the opening end of the phase change heat pipe 2 is larger than the diameter of the portion extending into the mounting shell 11 and larger than the inner diameter of the mounting shell 11. The mounting shell 11 and the upper end cap 12 cooperate to hold the opening end of the phase change heat pipe 2.

[0023] In designing this detachable molten salt heat exchange mechanism, the upper end cap 12 is detachably mounted at the mounting port of the mounting shell 11. The phase change heat exchange tube 2 partially passes through the mounting port and extends into the mounting shell 11. The opening of the phase change heat exchange tube 2 faces the upper end cap 12 and is filled with molten salt for absorbing heat energy. The diameter of the opening end of the phase change heat exchange tube 2 is larger than the diameter of the portion extending into the mounting shell 11 and also larger than the inner diameter of the mounting shell 11. The mounting shell 11 and the upper end cap 12 cooperate to hold the opening end of the phase change heat exchange tube 2. Because the opening end of the phase change heat exchange tube 2 is held at the upper end of the mounting shell 11, and the upper end cap 12 presses against the side of the opening end of the phase change heat exchange tube 2 away from the mounting shell 11, a cooperating holding action is achieved. When disassembling the phase change heat exchange tube 2, only the upper end cap 12 needs to be removed, and the entire phase change heat exchange tube 2 can be lifted out. The structure is simple and solves the problem that in existing molten salt heat storage devices, disassembling and replacing the heat storage and heat exchange unit is cumbersome and difficult to quickly detach from the shell, resulting in difficulty in rapid disassembly.

[0024] like Figure 1 As shown, in some optional embodiments, the phase change heat exchange tube 2 includes a first fixed tube sheet 21 and a plurality of heat exchange tubes 22. The open ends of the plurality of heat exchange tubes 22 all pass through the first fixed tube sheet 21 and are connected to the first fixed tube sheet 21. The other end of the heat exchange tubes 22 extends into the mounting shell 11. The interior of the heat exchange tubes 22 is filled with molten salt. The diameter of the first fixed tube sheet 21 is larger than the inner diameter of the mounting shell 11. The mounting shell 11 and the upper end cap 12 cooperate to hold the first fixed tube sheet 21.

[0025] In this embodiment, the structure of the phase change heat pipe 2 is specifically described. The phase change heat pipe 2 includes a first fixed tube sheet 21 and a plurality of heat exchange tubes 22. The open ends of the plurality of heat exchange tubes 22 all pass through the first fixed tube sheet 21 and are connected to the first fixed tube sheet 21. The other end of the heat exchange tube 22 extends into the mounting shell 11. The heat exchange tube 22 is filled with molten salt. The diameter of the first fixed tube sheet 21 is larger than the inner diameter of the mounting shell 11. The mounting shell 11 and the upper end cap 12 cooperate to hold the first fixed tube sheet 21. The plurality of heat exchange tubes 22 ensure the uniformity and efficiency of heat exchange.

[0026] like Figure 1 As shown, in some optional embodiments, the mounting shell 11 includes a mounting tube shell 111 and a lower end cap 112. The lower end of the heat exchange tube 22 passes through the mounting tube shell 111 and extends into the lower end cap 112. The two ends of the mounting tube shell 111 are detachably connected to the upper end cap 12 and the lower end cap 112, respectively.

[0027] In this embodiment, the structure of the mounting shell 11 is specifically described. The mounting shell 11 includes a mounting tube shell 111 and a lower end cap 112. The lower end of the heat exchange tube 22 passes through the mounting tube shell 111 and extends into the lower end cap 112. The two ends of the mounting tube shell 111 are detachably connected to the upper end cap 12 and the lower end cap 112, respectively. When molten salt leakage occurs inside the mounting shell 11, the lower end cap 112 can be removed to observe whether the lower end of the heat exchange tube 22 is damaged.

[0028] like Figure 1 As shown, in some optional embodiments, a plug 221 is provided at one end of the heat exchange tube 22 facing the lower end cap 112. The plug 221 is detachably connected to the heat exchange tube 22. When it is necessary to replace the molten salt filled inside, the plug 221 is removed to release the molten salt filled inside.

[0029] In this embodiment, a plug 221 is provided at one end of the heat exchange tube 22 facing the lower end cap 112. The plug 221 is detachably connected to the heat exchange tube 22. When it is necessary to replace the molten salt filled inside, the lower end cap 112 is removed first, and then the plug 221 is removed. The molten salt filled inside can be released directly without having to remove the entire heat exchange tube 22, which facilitates the process of replacing the molten salt.

[0030] like Figure 1 As shown, in some optional embodiments, the end of the mounting shell 111 near the upper end cap 12 is provided with a steam inlet 3, and the end of the lower end cap 112 away from the mounting shell 111 is provided with a steam condensate outlet 4. When heat exchange is performed, steam enters from the steam inlet 3, and after heat exchange through the heat exchange tube 22, it forms steam condensate, which is then discharged through the steam condensate outlet 4.

[0031] In this embodiment, the end of the mounting shell 111 near the upper end cap 12 is provided with a steam inlet 3, and the end of the lower end cap 112 away from the mounting shell 111 is provided with a steam condensate outlet 4. When heat exchange is performed, steam enters from the steam inlet 3, and after heat exchange through the heat exchange tube 22, it forms steam condensate, which is discharged through the steam condensate outlet 4, which facilitates heat exchange of steam and phase change heat storage.

[0032] like Figure 1As shown, in some optional embodiments, the phase change heat exchange tube 2 further includes a second fixed tube sheet 23. The diameter of the second fixed tube sheet 23 is smaller than the inner diameter of the mounting shell 11. The second fixed tube sheet 23 is located inside the mounting shell 11. One end of the heat exchange tube 22 extends into the mounting shell 11, passes through the second fixed tube sheet 23, and is connected to the second fixed tube sheet 23.

[0033] In this embodiment, the phase change heat pipe fitting 2 also includes a second fixed tube sheet 23. The diameter of the second fixed tube sheet 23 is smaller than the inner diameter of the mounting shell 11. The second fixed tube sheet 23 is located inside the mounting shell 11. One end of the heat exchange tube 22 extends into the mounting shell 11, passes through the second fixed tube sheet 23, and is connected to the second fixed tube sheet 23 to ensure the overall stability of the phase change heat pipe fitting 2.

[0034] In this example, the gap between the second fixed tube sheet 23 and the mounting shell 11 must allow steam condensate to pass through.

[0035] like Figure 1 As shown, in some optional embodiments, heat exchange fins 222 are provided on the outer side of the heat exchange tube 22.

[0036] In this embodiment, heat exchange fins 222 are provided on the outer side of the heat exchange tube 22 to increase the contact area with the material to be heat exchanged and improve the heat exchange efficiency.

[0037] like Figure 1 As shown, in some optional embodiments, the multiple heat exchange tubes 22 are arranged in a bundle.

[0038] In this embodiment, the multiple heat exchange tubes 22 are distributed in a bundle, resulting in better uniformity of distribution.

[0039] like Figure 1 As shown, in some optional embodiments, the upper end cap 12 is provided with a molten salt inlet 5 at the end away from the mounting shell 11.

[0040] In this embodiment, the upper end cap 12 is provided with a molten salt inlet 5 at the end away from the mounting shell 11, so that the upper end cap 12 does not need to be opened when filling molten salt, making the filling process more convenient.

[0041] like Figure 1 As shown, on the other hand, this application also provides a phase change heat exchange device, which includes the above-described detachable molten salt heat exchange mechanism.

[0042] In designing this detachable molten salt heat exchange mechanism, the upper end cap 12 is detachably mounted at the mounting port of the mounting shell 11. The phase change heat exchange tube 2 partially passes through the mounting port and extends into the mounting shell 11. The opening of the phase change heat exchange tube 2 faces the upper end cap 12 and is filled with molten salt for absorbing heat energy. The diameter of the opening end of the phase change heat exchange tube 2 is larger than the diameter of the portion extending into the mounting shell 11 and also larger than the inner diameter of the mounting shell 11. The mounting shell 11 and the upper end cap 12 cooperate to hold the opening end of the phase change heat exchange tube 2. Because the opening end of the phase change heat exchange tube 2 is held at the upper end of the mounting shell 11, and the upper end cap 12 presses against the side of the opening end of the phase change heat exchange tube 2 away from the mounting shell 11, a cooperating holding action is achieved. When disassembling the phase change heat exchange tube 2, only the upper end cap 12 needs to be removed, and the entire phase change heat exchange tube 2 can be lifted out. The structure is simple and solves the problem that in existing molten salt heat storage devices, disassembling and replacing the heat storage and heat exchange unit is cumbersome and difficult to quickly detach from the shell, resulting in difficulty in rapid disassembly.

[0043] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0044] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A detachable molten salt heat exchange mechanism, characterized in that, include: The outer casing (1) includes a mounting shell (11) and an upper end cap (12), the upper end cap (12) being detachably disposed at the mounting opening of the mounting shell (11); A phase change heat pipe (2) partially passes through the mounting port and extends into the mounting shell (11). The opening of the phase change heat pipe (2) faces the upper end cap (12) and is filled with molten salt for absorbing heat energy. The diameter of the opening end of the phase change heat pipe (2) is larger than the diameter of the portion extending into the mounting shell (11) and larger than the inner diameter of the mounting shell (11). The mounting shell (11) and the upper end cap (12) cooperate to hold the opening end of the phase change heat pipe (2).

2. The detachable molten salt heat exchange mechanism as described in claim 1, characterized in that, The phase change heat pipe fitting (2) includes a first fixed tube sheet (21) and a plurality of heat exchange tubes (22). The open ends of the plurality of heat exchange tubes (22) all pass through the first fixed tube sheet (21) and are connected to the first fixed tube sheet (21). The other end of the heat exchange tube (22) extends into the mounting shell (11). The heat exchange tube (22) is filled with molten salt. The diameter of the first fixed tube sheet (21) is larger than the inner diameter of the mounting shell (11). The mounting shell (11) and the upper end cap (12) cooperate to hold the first fixed tube sheet (21).

3. The detachable molten salt heat exchange mechanism as described in claim 2, characterized in that, The mounting shell (11) includes a mounting tube shell (111) and a lower end cap (112). The lower end of the heat exchange tube (22) passes through the mounting tube shell (111) and extends into the lower end cap (112). The two ends of the mounting tube shell (111) are detachably connected to the upper end cap (12) and the lower end cap (112), respectively.

4. A detachable molten salt heat exchange mechanism as described in claim 3, characterized in that, The heat exchange tube (22) is provided with a plug (221) at one end facing the lower end cap (112). The plug (221) is detachably connected to the heat exchange tube (22). When it is necessary to replace the molten salt filled inside, the plug (221) is removed and the molten salt filled inside is released.

5. A detachable molten salt heat exchange mechanism as described in claim 3, characterized in that, The mounting shell (111) has a steam inlet (3) at one end near the upper end cap (12), and the lower end cap (112) has a steam condensate outlet (4) at one end away from the mounting shell (111). When heat exchange is performed, steam enters from the steam inlet (3), and after heat exchange through the heat exchange tube (22), it forms steam condensate and is discharged through the steam condensate outlet (4).

6. A detachable molten salt heat exchange mechanism as described in claim 2, characterized in that, The phase change heat pipe fitting (2) further includes a second fixed tube sheet (23), the diameter of which is smaller than the inner diameter of the mounting shell (11). The second fixed tube sheet (23) is located inside the mounting shell (11). One end of the heat exchange tube (22) extends into the mounting shell (11), passes through the second fixed tube sheet (23), and is connected to the second fixed tube sheet (23).

7. A detachable molten salt heat exchange mechanism as described in claim 2, characterized in that, The heat exchange tube (22) is provided with heat exchange fins (222) on the outer side of its tube wall.

8. A detachable molten salt heat exchange mechanism as described in claim 2, characterized in that, The heat exchange tubes (22) are arranged in a bundle.

9. A detachable molten salt heat exchange mechanism as described in claim 1, characterized in that, The upper end cap (12) is provided with a molten salt inlet (5) at the end away from the mounting shell (11).

10. A phase change heat exchange device, characterized in that, Includes a detachable molten salt heat exchange mechanism as described in any one of claims 1-9.

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