Salt-salt heat exchanger
By designing the salt and salt heat exchanger of detachable shells and curved heat exchanges, the difficulty of replacement and thermal expansion of the collector heat exchanger is solved, and more efficient heat exchanges and convenient maintenance are achieved.
Patent Information
- Application Number
- CN202420228807.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-30
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-01-30
AI Technical Summary
The existing header type salt and salt heat exchanger is not convenient to replace the heat exchange tube, and there are problems with thermal expansion and thermal stress, which affects the heat exchange efficiency.
Design a salt and salt heat exchanger that includes removable cases and heat exchanges components. The heat exchange components include curved heat exchanges and folding boards, and the upper and lower lids are removed with the shell to facilitate maintenance for maintenance. Essence
The convenient replacement of the heat exchange pipe and the overcoming thermal expansion stress improve the heat exchange efficiency and avoid the difficulty of leakage and fault maintenance.
Smart Images
Figure CN222418731U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of heat exchangers, and in particular relates to a salt-salt heat exchanger. Background Art
[0002] Existing salt-salt heat exchangers mainly adopt shell and tube heat exchangers and header heat exchangers.
[0003] When the heat exchange medium is molten salt, due to the high temperature of molten salt, thermal expansion and thermal stress are large. Although the ordinary U-shaped shell and tube heat exchanger can partially meet the thermal displacement of the tube sheet and the heat exchange tube, the connection between the tube sheet and the heat exchange tube is prone to leakage. Although the header heat exchanger eliminates the tube sheet, the thermal displacement of the heat exchange tube can also be overcome. However, its irregular shell structure makes it almost without baffles in the shell, and the shell fluid is prone to form dead zones and short circuits, thus affecting the heat exchange efficiency; vertical heat exchange tubes are also not conducive to heat transfer; and the heat exchange tubes of general header heat exchangers cannot be disassembled, but due to the special characteristics of molten salt, it is very easy to cause blockage and bursting of the heat exchange tubes. The ability to replace the heat exchange tubes more conveniently is also an urgent consideration for salt-salt heat exchangers. Utility Model Content
[0004] The utility model aims to provide a salt-salt heat exchanger to solve the technical problem that the existing header type heat exchanger is inconvenient to replace the heat exchange tubes.
[0005] The present application provides a salt-salt heat exchanger, comprising: a shell, wherein a detachable upper cover and a lower cover are respectively provided at the upper and lower ends of the shell, wherein a low-temperature molten salt outlet and a low-temperature molten salt inlet are respectively provided on the upper cover and the lower cover; a heat exchange component is arranged in the shell, and the upper end and the lower end of the heat exchange component are respectively connected to a high-temperature molten salt outlet pipe and a high-temperature molten salt inlet pipe on the shell.
[0006] In one embodiment of the present application, the upper cover is connected to the upper end of the shell through an upper flange assembly, and the lower cover is connected to the lower end of the shell through a lower flange assembly.
[0007] In one embodiment of the present application, the heat exchange assembly includes: an upper collecting ring, which is hollow inside and connected to the high-temperature molten salt outlet pipe through a molten salt outlet flange; a lower collecting ring, which is hollow inside and connected to the high-temperature molten salt inlet pipe through a molten salt inlet flange; and a heat exchange tube group, which includes a plurality of curved heat exchange tubes, and the upper and lower ends of the heat exchange tubes are respectively connected to the upper collecting ring and the lower collecting ring.
[0008] In one embodiment of the present application, the heat exchange tube is bent in a spiral shape.
[0009] In one embodiment of the present application, the heat exchange assembly further includes a plurality of baffles installed on the heat exchange tube group.
[0010] In one embodiment of the present application, heat exchange tubes are arranged in a circumferential array on the upper collecting ring and the lower collecting ring, and the baffle is arranged on the inner side of the heat exchange tube group.
[0011] In one embodiment of the present application, when the heat exchange tubes provided on the upper collecting ring and the lower collecting ring are multiple layers in radial direction, the baffle is arranged on the inner side of the heat exchange tube group and in the interlayer gaps of the heat exchange tubes.
[0012] The beneficial effects of the utility model are as follows: the salt-to-salt heat exchanger of the utility model eliminates the tube sheet, thus avoiding the defect of easy leakage at the connection between the tube sheet and the heat exchange tube; in addition, the upper cover, the lower cover and the shell are detachably connected, and the heat exchange component is detachably connected to the high-temperature molten salt outlet pipe and the high-temperature molten salt inlet pipe on the shell. When a heat exchange tube in the heat exchange component fails, the corresponding connection can be disassembled, and then the heat exchange component can be lifted out of the shell as a whole, which is convenient for inspection and maintenance.
[0013] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures particularly pointed out in the description and the drawings.
[0014] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0016] Figure 1 is a schematic diagram of a salt-salt heat exchanger of a preferred embodiment of the utility model;
[0017] Figure 2 This is a schematic diagram of the connection between the upper collector ring and the high-temperature molten salt outlet pipe in a preferred embodiment of the utility model;
[0018] Figure 3a It is a schematic diagram of a heat exchange component of a preferred embodiment of the utility model;
[0019] Figure 3b It is a distribution diagram of a preferred embodiment of the utility model when the connection points between the heat exchange tube and the upper collector ring are single-layer;
[0020] Figure 4It is a distribution diagram of the connection points between the heat exchange tube and the upper collecting ring in a preferred embodiment of the utility model when there are multiple layers;
[0021] In the figure:
[0022] Shell 1, upper cover 11, low-temperature molten salt outlet 111, upper flange assembly 112, lower cover 12, low-temperature molten salt inlet 121, lower flange assembly 122, high-temperature molten salt outlet pipe 13, high-temperature molten salt inlet pipe 14, heat exchange assembly 2, upper collecting ring 21, molten salt outlet flange 211, lower collecting ring 22, molten salt inlet flange 221, heat exchange tube group 23, heat exchange tube 231, baffle 24. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0024] The present application provides a salt-salt heat exchanger, which is described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.
[0025] See also Figure 1 In one embodiment, the salt-salt heat exchanger includes: a shell 1, wherein a detachable upper cover 11 and a lower cover 12 are respectively provided at the upper and lower ends thereof, and a low-temperature molten salt outlet 111 and a low-temperature molten salt inlet 121 are respectively provided on the upper cover 11 and the lower cover 12; a heat exchange component 2 is arranged in the shell 1, and the upper end and the lower end of the heat exchange component 2 are detachably connected to a high-temperature molten salt outlet pipe 13 and a high-temperature molten salt inlet pipe 14 on the shell 1.
[0026] In this embodiment, the salt-salt heat exchanger eliminates the tube sheet, avoiding the defect of easy leakage at the connection between the tube sheet and the heat exchange tube; in addition, the upper cover 11 and the lower cover 12 are detachably connected to the shell 1, and the heat exchange component 2 is detachably connected to the high-temperature molten salt outlet pipe 13 and the high-temperature molten salt inlet pipe 14 on the shell 1. When the heat exchange tube in the heat exchange component 2 fails, the corresponding connection can be disassembled, and then the heat exchange component 2 can be lifted out of the shell 1 as a whole, which is convenient for inspection and maintenance.
[0027] Specifically, the upper cover 11 may be connected to the upper end of the shell 1 via an upper flange assembly 112 , and the lower cover 12 may be connected to the lower end of the shell 1 via a lower flange assembly 122 .
[0028] As a preferred embodiment of the heat exchange component 2, see Figure 1 and Figure 2 The heat exchange component 2 includes: an upper collecting ring 21, which is hollow inside and connected to the high-temperature molten salt outlet pipe 13 through a molten salt outlet flange 211; a lower collecting ring 22, which is hollow inside and connected to the high-temperature molten salt inlet pipe 14 through a molten salt inlet flange 221; and a heat exchange tube group 23, which includes a plurality of curved heat exchange tubes 231, and the upper end and the lower end of the heat exchange tube 231 are respectively connected to the upper collecting ring 21 and the lower collecting ring 22.
[0029] In this embodiment, low-temperature molten salt can enter the shell 1 from the low-temperature molten salt inlet 121, and be discharged from the low-temperature molten salt outlet 111 after being filled; high-temperature molten salt can enter the lower collecting ring 22 from the high-temperature molten salt inlet pipe 14, and then enter each heat exchange tube 231 to exchange heat with the low-temperature molten salt in the shell 1, and then enter the upper collecting ring 21 and be discharged from the high-temperature molten salt outlet pipe 13.
[0030] In this embodiment, the curved heat exchange tube 231 is used to overcome the thermal stress caused by the different thermal expansion between the traditional heat exchange tube and the shell; and the curved heat exchange tube 231 extends the flow path of the high-temperature molten salt in the shell 1, which is beneficial to the heat transfer of the fluid in the heat exchange tube.
[0031] Preferably, the heat exchange tube 231 may be bent in a spiral shape; the high-temperature molten salt outlet pipe 13 and the high-temperature molten salt inlet pipe 14 may be prefabricated on the shell 1 .
[0032] In this embodiment, see Figure 1 In order to disturb the low-temperature molten salt and improve the heat exchange efficiency, the heat exchange component 2 also includes a plurality of baffles 24, which are installed and fixed on the heat exchange tube group 23 and can be disassembled and assembled together with the heat exchange component.
[0033] In one embodiment, see Figure 3a , Figure 3b As shown, the upper collector ring 21 and the lower collector ring 22 are provided with heat exchange tubes 231 in a circumferential array, and the heat exchange tubes 231 are spirally shaped; when a large number of heat exchange tubes 231 are arranged along the radial direction of the upper collector ring 21 and the lower collector ring 22, when the outer side of the cylinder formed by the heat exchange tubes 231 is close to the inner wall of the shell 1, most of the low-temperature molten salt flows from the inner side of the cylinder and the gap between the heat exchange tubes 231, therefore, the baffle 24 can be arranged on the inner side of the spiral, that is, the inner side of the heat exchange tube group 23; optionally, as Figure 3b As shown, in the radial direction along the upper collecting ring 21 and the lower collecting ring 22, the heat exchange tube 231 can be a single layer.
[0034] In another embodiment, if Figure 4As shown, when multiple layers of heat exchange tubes 231 are arranged radially along the upper collecting ring 21 and the lower collecting ring 22, the low-temperature molten salt can flow upward from the inner side of the cylinder and the interlayer gaps of the heat exchange tubes 231, and a baffle 24 can be arranged on the inner side of the heat exchange tube group 23 and in the gaps between the heat exchange tubes 231.
[0035] Optionally, the baffle 24 may be connected to the heat exchange tube 231 via a tie rod.
[0036] In summary, the salt-salt heat exchanger of the utility model eliminates the tube sheet, thus avoiding the defect of easy leakage at the connection between the tube sheet and the heat exchange tube; adopts spiral heat exchange tubes to overcome the thermal stress caused by the different thermal expansion of traditional heat exchange tubes and shells; and the spiral tubes are beneficial to the heat transfer of the fluid in the heat exchange tubes; in addition, the upper cover and the lower cover are detachably connected to the shell, and the heat exchange component is detachably connected to the high-temperature molten salt outlet pipe and the high-temperature molten salt inlet pipe on the shell. When the heat exchange tube in the heat exchange component fails, the corresponding connection can be disassembled, and then the heat exchange component and the baffle can be lifted out of the shell as a whole, which is convenient for inspection and maintenance.
[0037] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to technical personnel in this field, and their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods.
[0038] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0040] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A salt-to-salt heat exchanger, characterized in that: include: A shell (1), wherein upper and lower ends thereof are respectively provided with a detachable upper cover (11) and a lower cover (12), and the upper cover (11) and the lower cover (12) are respectively provided with a low-temperature molten salt outlet (111) and a low-temperature molten salt inlet (121); The heat exchange component (2) is arranged in the shell (1), and the upper end and the lower end of the heat exchange component (2) are respectively detachably connected to the high-temperature molten salt outlet pipe (13) and the high-temperature molten salt inlet pipe (14) on the shell (1).
2. The salt-to-salt heat exchanger according to claim 1, characterized in that: The upper cover (11) is connected to the upper end of the shell (1) via an upper flange assembly (112), and the lower cover (12) is connected to the lower end of the shell (1) via a lower flange assembly (122).
3. The salt-to-salt heat exchanger according to claim 1, characterized in that: The heat exchange component (2) comprises: The upper collecting ring (21) is hollow inside and connected to the high-temperature molten salt outlet pipe (13) via a molten salt outlet flange (211); The lower collecting ring (22) is hollow inside and is connected to the high-temperature molten salt inlet pipe (14) through the molten salt inlet flange (221); The heat exchange tube group (23) comprises a plurality of curved heat exchange tubes (231), wherein the upper end and the lower end of the heat exchange tube (231) are respectively connected to the upper collecting ring (21) and the lower collecting ring (22).
4. The salt-to-salt heat exchanger according to claim 3, characterized in that: The heat exchange tube (231) is bent in a spiral shape.
5. The salt-to-salt heat exchanger according to claim 4, characterized in that: The heat exchange assembly (2) also includes a plurality of baffles (24) installed on the heat exchange tube group (23).
6. The salt-to-salt heat exchanger according to claim 5, characterized in that: Heat exchange tubes (231) are arranged in a circular array on the upper collecting ring (21) and the lower collecting ring (22), and the baffle (24) is arranged on the inner side of the heat exchange tube group (23).
7. The salt-to-salt heat exchanger according to claim 5, characterized in that: When the heat exchange tubes (231) provided on the upper collecting ring (21) and the lower collecting ring (22) are multiple layers in the radial direction, the baffle plates (24) are arranged on the inner side of the heat exchange tube group (23) and in the interlayer gaps of the heat exchange tubes (231).