Heat exchanger with groove type exhaust structure

Abstract

The utility model relates to the technical field of petrochemical equipment, in particular to a heat exchanger with a groove type exhaust structure, which comprises an upper box body, an upper tube plate, a shell pass barrel, a plurality of heat exchange tubes, a lower tube plate and a lower box body, and a shell pass space is defined by the upper tube plate, the lower tube plate and the shell pass barrel; an upper tube pass space is defined by the upper box body and the upper tube plate, and a lower tube pass space is defined by the lower box body and the lower tube plate. The bottom face of the upper pipe plate and / or the bottom face of the lower pipe plate are / is concaved to form a plurality of exhaust grooves distributed at intervals, all the exhaust grooves are transversely arranged in a long-strip-shaped penetrating mode, and the two ends of each exhaust groove communicate with exhaust connecting pipes. In the using process, bubbles located at the top of the shell pass space are accumulated towards the exhaust groove in time and discharged. Similarly, bubbles at the top of the lower tube pass space can be accumulated in the exhaust groove in time and discharged. Compared with the prior art, the bottom surface area of the corresponding tube plate covered by bubbles is reduced, the bubbles are more gathered, exhaust is more timely, overheating of the bottom of the upper tube plate / the bottom of the lower tube plate is more efficiently avoided, and therefore the service life of the heat exchanger is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical equipment, and particularly relates to a heat exchanger with a grooved exhaust structure. Background Art

[0002] A heat exchanger is an indispensable device for realizing heat exchange and transfer in the chemical production process. The shell-and-tube heat exchanger is the most widely used heat exchange device in industrial applications, and the vertical tube-sheet heat exchanger is very widely used in industrial production.

[0003] The heat exchanger includes an upper tube box, an upper tube sheet, a shell, a plurality of heat exchange tubes, a lower tube sheet and a lower tube box. The upper tube sheet and the lower tube sheet are respectively fixed at both ends of the shell to enclose a shell-side space; the upper tube box is fixed to the upper tube sheet and the two jointly enclose an upper tube-side space, and the lower tube box is fixed to the lower tube sheet and the two jointly enclose a lower tube-side space; both ends of the plurality of heat exchange tubes are respectively fixed to the upper tube sheet and the lower tube sheet, and are respectively communicated with the upper tube-side space and the lower tube-side space. When in use, the high-temperature fluid flows from the lower tube box through the heat exchange tubes to the upper tube box. A cooling medium is contained in the shell-side space, and the cooling medium continuously enters from the inlet and exits from the outlet. The cooling medium contains gas inclusions, which will cause the gas inclusions to continuously accumulate in the shell-side space and accumulate on the bottom surface of the upper tube sheet. Among them, the gas inclusions will adhere to the bottom surface of the upper tube sheet and then slowly gather into large bubbles. If these bubbles are not discharged, it will affect the heat exchange between the bottom surface of the upper tube sheet and the cooling medium, reduce the heat dissipation effect, especially at the connection between the bottom of the upper tube sheet and the heat exchange tubes, causing local overheating. Over time, the overheated position is prone to corrosion, shortening the service life of the heat exchanger.

[0004] The Chinese patent document with the application number CN202021042096.5 discloses a heat exchanger for preventing gas-phase thermal resistance in the shell side. The bottom surface of the upper tube sheet is in an arc-shaped arched convex shape, or a conical convex shape, or an inclined plane shape. An exhaust hole is opened inside the upper tube sheet. One end of the exhaust hole communicates with the high position of the bottom surface of the upper tube sheet, and the other end of the exhaust hole communicates with the outside of the upper tube sheet and is connected with an exhaust pipe. When needed, the exhaust pipe is opened, and the bubbles adhering to the bottom surface of the upper tube sheet climb from the low position to the high position along the bottom surface of the upper tube sheet by their own buoyancy and finally are discharged from the exhaust pipe, avoiding excessive bubble medium covering the bottom surface of the upper tube sheet, thereby avoiding local overheating damage to the bottom surface of the upper tube sheet, and thus being able to extend the service life of the heat exchanger.

[0005] The above exhaust structure realizes exhaust by relying on the inclined surface of the upper tube sheet and the exhaust holes opened on the side of the tube sheet, and optimizes the exhaust in the shell side of the shell-and-tube heat exchanger to a certain extent. In actual application, the bubbles climb along the inclined surface. If there are more bubbles generated due to intense heat exchange, the continuous bubbles queue up and climb, and there is still a layer of bubble medium left at the bottom of the upper tube sheet. Summary of the Invention

[0006] In view of the above technical problems existing in the prior art, the present utility model provides a heat exchanger with a grooved exhaust structure.

[0007] To achieve the above object, the present utility model provides the following technical solutions:

[0008] Provide a heat exchanger with a grooved exhaust structure, including an upper box body, an upper tube sheet, a shell-side cylinder, a plurality of heat exchange tubes, a lower tube sheet and a lower box body. The upper tube sheet and the lower tube sheet are respectively fixed at both ends of the shell-side cylinder to enclose a shell-side space. The shell-side cylinder is provided with a shell-side medium inlet pipe and a shell-side medium outlet pipe communicating with the shell-side space. The upper box body is fixed to the upper tube sheet to enclose an upper tube-side space, and the lower box body is fixed to the lower tube sheet to form a lower tube-side space. A plurality of heat exchange tubes are arranged in the shell-side space, and both ends thereof respectively penetrate through the upper tube sheet to communicate with the upper tube-side space and penetrate through the lower tube sheet to communicate with the lower tube-side space. The feature is that: a plurality of exhaust grooves are recessed on the bottom surface of the upper tube sheet and / or the lower tube sheet and are distributed at intervals, and each exhaust groove is arranged horizontally in a long strip shape and penetrates through, and both ends of the exhaust groove are communicated with an exhaust connection pipe.

[0009] Preferably, the tube holes arranged for the heat exchange tubes to penetrate through on the upper tube sheet / the tube holes arranged for the heat exchange tubes to penetrate through on the lower tube sheet are staggered with the exhaust grooves.

[0010] Preferably, the cross-sectional shape of the exhaust groove is arc-shaped or polygonal.

[0011] Preferably, the depth of the exhaust groove is constant along the length direction.

[0012] Preferably, the depth of the exhaust groove changes along the length direction, and the depth of the exhaust groove decreases towards the direction close to the exhaust connection pipe.

[0013] Preferably, the exhaust connection pipe is welded and fixed to the outside of the upper tube sheet / the lower tube sheet.

[0014] Preferably, a plurality of exhaust connection pipes are independently connected to different exhaust grooves.

[0015] Preferably, the exhaust connection pipe is arc-shaped and wraps around the outside of the upper tube sheet / the lower tube sheet, so as to connect the ends of a plurality of exhaust grooves, and the exhaust connection pipe is provided with an exhaust port.

[0016] Preferably, the exhaust groove is an integrally cast structure or a turning and milling formed structure.

[0017] Preferably, an expansion joint is provided on the side wall of the shell-side cylinder.

[0018] The beneficial effects of the present utility model:

[0019] A heat exchanger with a grooved exhaust structure according to the present utility model. When an exhaust groove is provided on the upper tube sheet, during the use process, the bubbles located at the top of the shell-side space timely accumulate in the exhaust groove and are discharged from the corresponding exhaust connection pipe; when an exhaust groove is provided on the lower tube sheet, similarly, during the use process, the bubbles at the top of the lower tube-side space can timely accumulate in the exhaust groove and are discharged from the corresponding exhaust connection pipe. Compared with the prior art, the bottom area of the corresponding tube sheet covered by the bubbles is reduced, the bubbles are more concentrated, the exhaust is more timely, and overheating at the bottom of the upper tube sheet / the bottom of the lower tube sheet is more effectively avoided, thereby prolonging the service life of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a heat exchanger with a grooved exhaust structure in the embodiment.

[0021] Figure 2 It is a perspective view of the upper tube sheet in the embodiment, and the structure of the lower tube sheet is the same as it.

[0022] Reference numerals:

[0023] Upper box body 1, upper tube sheet 2, shell-side cylinder 3, heat exchange tubes 4, lower tube sheet 5, lower box body 6, shell-side space 7, shell-side medium inlet pipe 8, shell-side medium outlet pipe 9, upper tube-side space 10, lower tube-side space 11, expansion joint 12, exhaust connection pipe 13, exhaust groove 25. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0025] A heat exchanger with a grooved exhaust structure in this embodiment, as Figure 1 and Figure 2 shown, includes an upper box body 1, an upper tube sheet 2, a shell-side cylinder 3, a plurality of heat exchange tubes 4, a lower tube sheet 5 and a lower box body 6. The upper tube sheet 2 and the lower tube sheet 5 are respectively fixed at both ends of the shell-side cylinder 3 to enclose a shell-side space 7. The shell-side cylinder 3 is provided with a shell-side medium inlet pipe 8 and a shell-side medium outlet pipe 9 communicating with the shell-side space 7; the upper box body 1 is fixed to the upper tube sheet 2 to enclose an upper tube-side space 10, and the lower box body 6 is fixed to the lower tube sheet 5 to form a lower tube-side space 11; a plurality of heat exchange tubes 4 are arranged in the shell-side space 7, and both ends thereof respectively penetrate through the upper tube sheet 2 to communicate with the upper tube-side space 10 and penetrate through the lower tube sheet 5 to communicate with the lower tube-side space 11; the feature is that: a plurality of exhaust grooves 25 are concavely formed at the bottom surfaces of the upper tube sheet 2 and the lower tube sheet 5 and are distributed at intervals, and each exhaust groove 25 is in a strip shape and horizontally penetrates through to the edge of the upper tube sheet 2 / the lower tube sheet 5, and both ends of the exhaust groove 25 are communicated with the exhaust connection pipe 13.

[0026] During the use process, the bubbles located at the top of the shell-side space 7 accumulate in the exhaust groove 25 in a timely manner and are discharged from the corresponding exhaust connection pipe 13; similarly, the bubbles at the top of the lower tube-side space 11 can accumulate in the exhaust groove 25 in a timely manner and are discharged from the corresponding exhaust connection pipe 13. Compared with the prior art, the bottom area of the corresponding tube sheet covered by the bubbles is reduced, the bubbles are more concentrated, the exhaust is more timely, and overheating at the bottom of the upper tube sheet 2 / the bottom of the lower tube sheet 5 is more effectively avoided, thereby prolonging the service life of the heat exchanger.

[0027] It can be understood that in this embodiment, exhaust grooves 25 are respectively formed on the upper tube sheet 2 and the lower tube sheet 5. In practice, according to needs, the exhaust groove 25 can be provided only on one of them.

[0028] In this embodiment, the arranged tube holes for the heat exchange tubes 4 to pass through on the upper tube sheet 2 are staggered with the exhaust groove 25, and the arranged tube holes for the heat exchange tubes 4 to pass through on the lower tube sheet 5 are staggered with the exhaust groove 25. That is, a row of tube holes, an exhaust groove 25, and a row of tube holes are circulated and staggered in this way. The tube holes are not shown in the figure.

[0029] In practice, the cross-sectional shape of the exhaust groove 25 is arc-shaped or polygonal, and a semi-circular arc shape is shown in the figure.

[0030] In this embodiment, the depth of the exhaust groove 25 is constant along the length direction. In practice, it can be changed to that the depth of the exhaust groove 25 changes along the length direction, and the depth decreases towards the direction close to the exhaust connection pipe 13, that is, it gradually becomes shallower from the middle to the periphery.

[0031] In this embodiment, the exhaust connection pipe 13 is welded and fixed to the outside of the upper tube sheet 2 / the lower tube sheet 5. Multiple exhaust connection pipes 13 are independently connected to different exhaust grooves 25.

[0032] In practice, it can be changed to that the exhaust connection pipe 13 is arc-shaped, such as an open semi-circular ring shape, which wraps the outside of the upper tube sheet 2 / the lower tube sheet 5, so as to connect the ends of multiple exhaust grooves 25, and the exhaust connection pipe 13 is provided with an exhaust port.

[0033] In practice, the exhaust groove 25 is an integrally cast structure or a turning and milling formed structure.

[0034] In this embodiment, an expansion joint 12 is provided on the side wall of the shell-side cylinder 3.

[0035] In the description of the present invention, obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings here usually can be arranged and designed in various different configurations.

[0036] Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention claimed, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inside", "upper", "lower", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is usually placed during use. It is 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 should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. It may be a mechanical connection or an electrical connection. It may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A heat exchanger with a slotted exhaust structure, comprising an upper box (1), an upper tube sheet (2), a shell-side cylinder (3), a plurality of heat exchange tubes (4), a lower tube sheet (5) and a lower box (6), wherein the upper tube sheet (2) and the lower tube sheet (5) are respectively fixed to the two ends of the shell-side cylinder (3) to enclose a shell-side space (7), and the shell-side cylinder (3) is provided with a shell-side medium inflow tube (8) and a shell-side medium outflow tube (9) connected to the shell-side space (7); the upper box (1) and the upper tube sheet (2) are fixed to enclose an upper tube-side space (10), and the lower box (6) and the lower tube sheet (5) are fixed to form a lower tube-side space (11); the plurality of heat exchange tubes (4) are arranged in the shell-side space (7), and the two ends of the heat exchange tubes are respectively penetrated through the upper tube sheet (2) to connect to the upper tube-side space (10), and penetrated through the lower tube sheet (5) to connect to the lower tube-side space (11); the characteristics are: The bottom surface of the upper tube plate (2) and / or the lower tube plate (5) is concave to form a plurality of exhaust grooves (25) distributed at intervals, and each exhaust groove (25) is arranged in a long strip and penetrates horizontally, and both ends of the exhaust groove (25) are connected to an exhaust pipe (13).

2. A heat exchanger with a slotted exhaust structure according to claim 1, characterized in that: The arranged tube holes for the heat exchange tubes (4) to pass through the upper tube plate (2) and the arranged tube holes for the heat exchange tubes (4) to pass through the lower tube plate (5) are arranged alternately with the exhaust grooves (25).

3. The heat exchanger with a slotted exhaust structure according to claim 1, characterized in that: The cross-sectional shape of the exhaust groove (25) is arc-shaped or polygonal.

4. The heat exchanger with a slotted exhaust structure according to claim 1, characterized in that: The depth of the exhaust groove (25) is constant along the length direction.

5. The heat exchanger with a slotted exhaust structure according to claim 1, characterized in that: The groove depth of the exhaust groove (25) varies along the length direction, and the groove depth decreases toward the exhaust pipe (13).

6. The heat exchanger with a slotted exhaust structure according to claim 1, characterized in that: The exhaust pipe (13) is welded and fixed to the outer side of the upper tube plate (2) / lower tube plate (5).

7. The heat exchanger with a slotted exhaust structure according to claim 1, characterized in that: A plurality of exhaust pipes (13) are independently connected to different exhaust slots (25).

8. The heat exchanger with a slotted exhaust structure according to claim 1, characterized in that: The exhaust pipe (13) is in an arc shape and is wrapped around the outer side of the upper tube plate (2) / lower tube plate (5), thereby connecting the ends of a plurality of exhaust grooves (25). The exhaust pipe (13) is provided with an exhaust port.

9. The heat exchanger with a slotted exhaust structure according to claim 1, characterized in that: The exhaust groove (25) is an integrally cast structure or a milling structure.

10. The heat exchanger with a slotted exhaust structure according to claim 1, characterized in that: An expansion joint (12) is provided on the side wall of the shell-side cylinder (3).

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