Expansion joint structure and quenching heat exchanger
By designing an expansion joint structure including a cylinder, corrugated pipe and limiting assembly, the problems of heat exchanger bends and buckling of the baffle plate caused by expansion joints in the quench heat exchanger are solved, and a smaller radial displacement and a more stable heat exchange process are achieved.
Patent Information
- Application Number
- CN202422122299.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-30
AI Technical Summary
In the high temperature environment, the expansion joints of the quench heat exchanger cause excessive radial displacement of the shell, causing the heat exchanger to bend and deformation and the problem of the baffle plate and the inner wall of the shell.
An expansion joint structure is designed, including a first cylinder, a second cylinder, a corrugated tube and a limiting assembly. The corrugated pipe is connected to the first cylinder through a mounting hole, and the limiting assembly is arranged in the radial direction of the corrugated pipe to prevent excessive expansion of the corrugated pipe.
It effectively limits the radial expansion of the bellows, reduces the radial displacement of the shell, and reduces the chance of bending deformation of the heat exchange tube and the baffle plate being stuck.
Smart Images
Figure CN223036989U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of expansion joints, in particular to an expansion joint structure and a quench heat exchanger. Background Art
[0002] A quench heat exchanger refers to a key device with very strong processability in an ethylene cracking unit. The quench heat exchanger mainly undertakes two tasks: one is to quickly cool the high-temperature cracking gas at about 800 °C to below the secondary reaction temperature to reduce olefin loss; the other is to recover as much high-level heat energy of the cracking gas as possible to generate high-pressure steam at about 12 MPa.
[0003] When the quench heat exchanger works, its shell will expand, which is likely to cause the heat exchange tubes arranged in the shell to bend and deform. However, if an expansion joint is installed on the shell, problems such as bending and deformation of the heat exchange tubes will also occur, and even problems such as the baffle being stuck to the inner wall of the shell will occur. Specifically, if the expansion joint is installed on the shell of the quench heat exchanger, in a high-temperature environment, the radial expansion amounts at different positions in the circumferential direction of the expansion joint are different. When the radial expansion amount at a certain position of the expansion joint is too large, the expansion joint drives the shell to have a large radial displacement. Since the baffle is fixed to the inner wall of the shell and the heat exchange tubes pass through the baffle, the baffle moves radially with the shell, which is likely to cause the heat exchange tubes to bend and deform. In addition, if the shell moves in the direction of the gap between the inner wall of the shell and the baffle, when the radial movement amount of the shell is too large, the problem of the baffle being stuck to the inner wall of the shell will occur.
[0004] Therefore, there is an urgent need to propose an expansion joint structure and a quench heat exchanger to solve the above technical problems. Summary of the Utility Model
[0005] The first object of the utility model is to provide an expansion joint structure, which has the effect of restricting the excessive radial expansion amount of the bellows.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] The expansion joint structure includes:
[0008] A first cylinder and a second cylinder, the first cylinder is sleeved outside the second cylinder, the inner wall of the first cylinder is hermetically connected to the outer wall of the second cylinder, both ends of the first cylinder are used to be connected to the shell of the quench heat exchanger, an installation hole is provided on the first cylinder, the installation hole extends along the circumferential direction of the first cylinder to form a closed-loop structure, and the second cylinder plugs the installation hole inside the first cylinder;
[0009] A bellows, the bellows is sleeved outside the second cylinder and located at the installation hole, both ends of the bellows are respectively connected to the opposite side edges of the installation hole, and the inner wall of the bellows is spaced from the outer wall of the second cylinder;
[0010] The limiting component is connected to the outer wall of the first cylinder body, and along the radial direction of the corrugated pipe, the limiting component is arranged at an interval from the outer wall of the corrugated pipe.
[0011] Optionally, a first thinning area is provided on the inner wall of the first cylinder body. The first thinning area extends along the circumferential direction of the first cylinder body to form a closed-loop structure. The number of the first thinning areas is two. The two first thinning areas are respectively located on both sides of the mounting hole along the axial direction of the first cylinder body. Both ends of the second cylinder body are hermetically connected to a corresponding first thinning area.
[0012] Optionally, a first heat-insulating seal is filled between the first thinning area and the outer wall of the second cylinder body.
[0013] Optionally, a second thinning area is provided on the inner wall of the first cylinder body. The second thinning area extends along the circumferential direction of the first cylinder body to form a closed-loop structure. The number of the second thinning areas is two. The two second thinning areas are respectively located at the two side edges of the mounting hole along the axial direction of the first cylinder body. Both ends of the corrugated pipe are respectively connected to a corresponding second thinning area.
[0014] Optionally, a second heat-insulating seal is filled between the second thinning area and the outer wall of the second cylinder body.
[0015] Optionally, the limiting component includes a connecting piece and a limiting rod. The connecting piece is connected to the outer wall of the first cylinder body, and the limiting rod is connected to the connecting piece. Along the radial direction of the corrugated pipe, the limiting rod is arranged at an interval from the outer wall of the corrugated pipe.
[0016] Optionally, the number of the connecting pieces is two. The two connecting pieces are respectively located on both sides of the mounting hole along the axial direction of the first cylinder body. Both ends of the limiting rod are respectively connected to a corresponding connecting piece.
[0017] Optionally, the number of the limiting components is multiple, and the multiple limiting components are evenly distributed along the circumferential direction of the corrugated pipe.
[0018] The second object of the present utility model is to provide a quench heat exchanger, in which the probability of bending deformation of the heat exchange tubes of the quench heat exchanger is small, and the probability of jamming between the inner wall of the shell of the quench heat exchanger and the baffle is small.
[0019] To achieve this purpose, the present utility model adopts the following technical solutions:
[0020] The quench heat exchanger includes a shell and the above-mentioned expansion joint structure. The first cylinder body is coaxial with the shell, and both ends of the first cylinder body are connected to the shell.
[0021] Optionally, the second cylinder body is coaxial with the shell. The distance between the inner wall of the second cylinder body and the axis of the second cylinder body is a, and the distance between the inner wall of the shell and the axis of the shell is b, and a≥b.
[0022] The beneficial effects of the present utility model:
[0023] For the expansion joint structure provided by the present utility model, when the corrugated pipe expands in a direction away from its axis, the distance between the outer wall of the corrugated pipe and the limiting component decreases until the outer wall of the corrugated pipe abuts against the limiting component, and the limiting component limits the corrugated pipe, preventing the corrugated pipe from expanding too much in the direction away from its axis; when the corrugated pipe moves in a direction close to its axis, the distance between the inner wall of the corrugated pipe and the outer wall of the second cylinder decreases until the inner wall of the corrugated pipe abuts against the outer wall of the second cylinder, and the second cylinder limits the corrugated pipe, preventing the corrugated pipe from expanding too much in the direction close to its axis. It can be seen that this expansion joint structure has the effect of restricting the excessive radial expansion amount of the corrugated pipe. Description of the Drawings
[0024] Figure 1 is a schematic structural diagram of a quench heat exchanger provided by an embodiment of the present utility model;
[0025] Figure 2 is a partially enlarged structural schematic diagram of the expansion joint structure provided by an embodiment of the present utility model;
[0026] Figure 3 is Figure 2 a partially enlarged view at A in
[0027] In the figure:
[0028] 10. Shell; 21. First baffle; 22. Second baffle; 23. First gap; 24. Second gap; 30. Heat exchange tube; 40. Expansion joint structure;
[0029] 100. First cylinder; 110. Installation hole; 120. First thinning area; 130. Second thinning area; 200. Second cylinder; 300. Corrugated pipe; 400. Limiting component; 410. Connecting piece; 420. Limiting rod; 500. First heat insulation and sealing part. Detailed Embodiments
[0030] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only parts related to the present utility model are shown in the drawings, rather than all the structures.
[0031] In the description of the present utility model, unless otherwise clearly specified and defined, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; 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 components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0032] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.
[0033] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.
[0034] This embodiment provides an expansion joint structure, and this expansion joint structure has the effect of restricting the excessive radial expansion amount of the bellows.
[0035] Specifically, as Figure 1 and Figure 2As shown, the expansion joint structure 40 includes a first cylinder 100, a second cylinder 200, a bellows 300 and a stop assembly 400, wherein the first cylinder 100 is sleeved on the outside of the second cylinder 200, the inner wall of the first cylinder 100 is sealed and connected to the outer wall of the second cylinder 200, both ends of the first cylinder 100 are used to connect with the shell 10 of the quench heat exchanger, and the first cylinder 100 is provided with a mounting hole 110, which extends along the circumference of the first cylinder 100 to form a closed loop structure. The second cylinder 200 blocks the mounting hole 110 on the inner side of the first cylinder 100, the bellows 300 is sleeved on the outer side of the second cylinder 200 and is located at the mounting hole 110, the two ends of the bellows 300 are respectively connected to the two side edges opposite to the mounting hole 110, the inner wall of the bellows 300 is spaced apart from the outer wall of the second cylinder 200, the limiting assembly 400 is connected to the outer wall of the first cylinder 100, and along the radial direction of the bellows 300, the limiting assembly 400 is spaced apart from the outer wall of the bellows 300.
[0036] Based on the above design, when the bellows 300 expands in a direction away from its axis, the distance between the outer wall of the bellows 300 and the limit assembly 400 decreases until the outer wall of the bellows 300 abuts against the limit assembly 400. The limit assembly 400 limits the bellows 300 to prevent the bellows 300 from expanding too much in a direction away from its axis; when the bellows 300 moves in a direction close to its axis, the distance between the inner wall of the bellows 300 and the outer wall of the second cylinder 200 decreases until the inner wall of the bellows 300 abuts against the outer wall of the second cylinder 200. The second cylinder 200 limits the bellows 300 to prevent the bellows 300 from expanding too much in a direction close to its axis. It can be seen that the expansion joint structure 40 has the effect of limiting the excessive radial expansion of the bellows 300.
[0037] In this embodiment, the bellows 300 is made of high-nickel stainless steel material so that the bellows 300 has good high temperature resistance and corrosion resistance. In addition, the bellows 300 uses a multi-layer structure of the bellows 300, which not only ensures that the bellows 300 has a certain thickness, but also increases its softness, thereby extending the service life of the bellows 300.
[0038] Alternatively, if Figures 1 to 3 As shown, the inner wall of the first cylinder 100 is provided with a first thinning zone 120, and the first thinning zone 120 extends along the circumference of the first cylinder 100 to form a closed loop structure. There are two first thinning zones 120, and the two first thinning zones 120 are respectively located on both sides of the mounting hole 110 along the axial direction of the first cylinder 100. The two ends of the second cylinder 200 are respectively sealed and connected to a corresponding first thinning zone 120. The design of the first thinning zone 120 can minimize the inner wall of the second cylinder 200 from protruding from the inner wall of the shell 10 to ensure the normal operation of the quench heat exchanger.
[0039] Further, as Figures 1 to 3 shown, a first heat-insulating seal 500 is filled between the first thinning area 120 and the outer wall of the second cylinder 200. On the one hand, it prevents the working medium flowing in the housing 10 from entering the installation hole 110. On the other hand, it can also block heat and prevent the bellows 300 from being damaged by high temperature.
[0040] Furthermore, the distance between the first thinning area 120 and the outer wall of the second cylinder 200 is less than or equal to 1.5 mm. For example, the gap can be 1.5 mm, 1.2 mm, or 0.8 mm, etc., to ensure good heat-insulating and sealing performance of the filling between the first thinning area 120 and the outer wall of the second cylinder 200.
[0041] Optionally, as Figures 1 to 3 shown, a second thinning area 130 is provided on the inner wall of the first cylinder 100. The second thinning area 130 extends along the circumferential direction of the first cylinder 100 to form a closed-loop structure. The number of the second thinning areas 130 is two. The two second thinning areas 130 are respectively located at the two side edges of the installation hole 110 along the axial direction of the first cylinder 100. The two ends of the bellows 300 are respectively connected to a corresponding second thinning area 130. Compared with the connection of the bellows 300 to the outer wall of the first cylinder 100, the technical solution provided in this embodiment connects the bellows 300 to the inner wall of the first cylinder 100, improving the overall structural consistency of the expansion joint structure 40. Moreover, the design of the second thinning area 130 provides an installation space for the bellows 300, avoiding the problem that the bellows 300 is clamped between the inner wall of the first cylinder 100 and the outer wall of the second cylinder 200 and is squeezed and deformed.
[0042] Further, a second heat-insulating seal (not shown in the figure) is filled between the second thinning area 130 and the outer wall of the second cylinder 200, further achieving the effect of heat-insulating and sealing.
[0043] In this embodiment, both the first heat-insulating seal 500 and the second heat-insulating seal are ceramic fiber papers. Of course, in other embodiments, the first heat-insulating seal 500 and the second heat-insulating seal can also be other elements with heat-insulating and sealing properties, such as asbestos rubber sheet gaskets or PTFE gaskets, etc., which will not be listed one by one here.
[0044] Optionally, as Figures 1 to 3As shown, the limiting component 400 includes a connecting piece 410 and a limiting rod 420. The connecting piece 410 is connected to the outer wall of the first cylinder 100, and the limiting rod 420 is connected to the connecting piece 410. Along the radial direction of the corrugated pipe 300, the limiting rod 420 is arranged at an interval from the outer wall of the corrugated pipe 300. When the corrugated pipe 300 expands in the direction away from its axis, the distance between the outer wall of the corrugated pipe 300 and the limiting rod 420 decreases until the outer wall of the corrugated pipe 300 abuts against the limiting rod 420, and the limiting rod 420 limits the corrugated pipe 300.
[0045] Furthermore, as Figures 1 to 3 shown, the number of the connecting pieces 410 is two. The two connecting pieces 410 are respectively located on both sides of the mounting hole 110 along the axis direction of the first cylinder 100. The two ends of the limiting rod 420 are respectively connected to a corresponding connecting piece 410, preventing the problem of skewing when the connecting piece 410 abuts against the outer wall of the corrugated pipe 300, and having the effect of improving the reliability and stability of the connection piece 410 in limiting the corrugated pipe 300.
[0046] In this embodiment, the limiting rod 420 is a bolt. The nut at the first end of the bolt cooperates with the first nut to fix the first end of the screw rod on a connecting piece 410, and the second end of the screw rod is in threaded cooperation with two second nuts to fix the second end of the screw rod on the other connecting piece 410. This structural design is simple and is beneficial to simplifying the disassembly and assembly process of the limiting rod 420 and the connecting piece 410. Of course, in other implementation schemes, the limiting rod 420 can also be a smooth rod, and its two ends can also be connected to the connecting piece 410 by welding or clamping and other means.
[0047] Optionally, the number of the limiting components 400 is multiple. Exemplarily, the number of the limiting components 400 can be two, three, six or seven, etc. The multiple limiting components 400 are evenly distributed along the circumferential direction of the corrugated pipe 300 to improve the uniformity of the limiting effect of the limiting components 400 on the corrugated pipe 300.
[0048] In another implementation scheme, the limiting component includes a connecting piece and a limiting plate. The connecting piece is connected to the outer wall of the first cylinder, the limiting plate is arranged at an interval from the outer wall of the corrugated pipe and the limiting plate is connected to the connecting piece. The limiting plate extends along the circumferential direction of the corrugated pipe and is connected end to end.
[0049] This embodiment also provides a quench heat exchanger. The probability of bending deformation of the heat exchange tubes of this quench heat exchanger is relatively small, and the probability of the inner wall of the shell of this quench heat exchanger being stuck by the baffle is relatively small.
[0050] Specifically, as Figure 1As shown in the figure, the quench heat exchanger includes a housing 10, a first baffle 21, a second baffle 22, heat exchange tubes 30, and the above-mentioned expansion joint structure 40. The number of the first baffle 21 and the second baffle 22 is multiple. The multiple first baffles 21 and the multiple second baffles 22 are distributed along the axial direction of the housing 10, and the multiple first baffles 21 and the multiple second baffles 22 are both connected to the inner wall of the housing 10. A first gap 23 is left between the first baffle 21 and the inner wall of the housing 10, and a second gap 24 is left between the second baffle 22 and the inner wall of the housing 10. In the radial direction of the housing 10, the first gap 23 and the second gap 24 are respectively located on opposite sides of the housing 10. The heat exchange tubes 30 pass through the multiple first baffles 21 and the multiple second baffles 22. The first cylinder 100 is coaxial with the housing 10, and both ends of the first cylinder 100 are connected to the housing 10.
[0051] The quench heat exchanger adopts the above-mentioned expansion joint structure 40. The limiting component 400 can prevent the bellows 300 from expanding too much in its radial direction, and thus can avoid the problem that the housing 10, the first baffle 21 and the second baffle 22 have too large radial displacement amounts along the radial direction of the bellows 300, reducing the probability of the problem that the heat exchange tubes 30 are bent and deformed. Moreover, when the bellows 300 moves in the direction close to its axis, the second cylinder 200 can limit the bellows 300, preventing the problem that the side of the first baffle 21 facing the first gap 23 is stuck with the inner wall of the housing 10 and / or the problem that the side of the second baffle 22 facing the second gap 24 is stuck with the inner wall of the housing 10 due to the bellows 300 moving too much in the direction close to its axis.
[0052] Furthermore, the second cylinder 200 is coaxial with the housing 10. The distance between the inner wall of the second cylinder 200 and the axis of the second cylinder 200 is a, and the distance between the inner wall of the housing 10 and the axis of the housing 10 is b, and a≥b, to prevent the side of the first baffle 21 facing the first gap 23 from being stuck with the inner wall of the second cylinder 200 and / or the side of the second baffle 22 facing the second gap 24 from being stuck with the inner wall of the second cylinder 200, thus avoiding the problem that the baffle and the heat exchange tubes 30 cannot expand freely.
[0053] In this embodiment, the quench heat exchanger is a heat exchanger for gaseous media. The working pressures of its housing 10 and heat exchange tubes 30 are not high, generally below 1.0 MPa.
[0054] In this embodiment, an exhaust port is provided at the bottom of the shell 10 of the quench heat exchanger, and an air inlet is provided at the top of the shell 10. The gas flowing in the shell 10 enters the shell 10 from the top of the shell 10 and exchanges heat with the gas in the heat exchange tube 30, and then is discharged from the bottom of the shell 10. The bottom of the heat exchange tube 30 is the inlet, and the top of the heat exchange tube 30 is the outlet. The gas flowing in the heat exchange tube 30 enters the heat exchange tube 30 from the bottom of the heat exchange tube 30 and exchanges heat with the gas in the shell 10, and then is discharged from the top of the heat exchange tube 30.
[0055] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. Expansion joint structure, characterized in that: include: A first cylinder (100) and a second cylinder (200), wherein the first cylinder (100) is sleeved on the outside of the second cylinder (200), the inner wall of the first cylinder (100) is sealedly connected to the outer wall of the second cylinder (200), both ends of the first cylinder (100) are used to be connected to the shell (10) of the quench heat exchanger, the first cylinder (100) is provided with a mounting hole (110), the mounting hole (110) extends along the circumference of the first cylinder (100) to form a closed loop structure, and the second cylinder (200) blocks the mounting hole (110) on the inner side of the first cylinder (100); a bellows (300), the bellows (300) being sleeved on the outside of the second cylinder (200) and located at the mounting hole (110), the two ends of the bellows (300) being respectively connected to the two opposite edges of the mounting hole (110), and the inner wall of the bellows (300) being spaced apart from the outer wall of the second cylinder (200); A limiting assembly (400), wherein the limiting assembly (400) is connected to the outer wall of the first cylinder (100), and along the radial direction of the corrugated tube (300), the limiting assembly (400) and the outer wall of the corrugated tube (300) are spaced apart.
2. The expansion joint structure according to claim 1, characterized in that: The inner wall of the first cylinder (100) is provided with a first thinning area (120), and the first thinning area (120) extends along the circumference of the first cylinder (100) to form a closed loop structure. The number of the first thinning areas (120) is two, and the two first thinning areas (120) are respectively located on both sides of the mounting hole (110) along the axial direction of the first cylinder (100), and the two ends of the second cylinder (200) are respectively sealed and connected to a corresponding one of the first thinning areas (120).
3. The expansion joint structure according to claim 2, characterized in that: A first heat insulating seal (500) is filled between the first thinned area (120) and the outer wall of the second cylinder (200).
4. The expansion joint structure according to any one of claims 1 to 3, characterized in that: The inner wall of the first cylinder (100) is provided with a second thinning area (130), and the second thinning area (130) extends along the circumference of the first cylinder (100) to form a closed loop structure. The number of the second thinning areas (130) is two, and the two second thinning areas (130) are respectively located at the two side edges of the mounting hole (110) along the axial direction of the first cylinder (100), and the two ends of the bellows (300) are respectively connected to a corresponding one of the second thinning areas (130).
5. The expansion joint structure according to claim 4, characterized in that: A second heat-insulating sealant is filled between the second thinned area (130) and the outer wall of the second cylinder (200).
6. The expansion joint structure according to any one of claims 1 to 3, characterized in that: The limiting assembly (400) comprises a connecting piece (410) and a limiting rod (420), wherein the connecting piece (410) is connected to the outer wall of the first cylinder (100), and the limiting rod (420) is connected to the connecting piece (410), and along the radial direction of the bellows (300), the limiting rod (420) is spaced apart from the outer wall of the bellows (300).
7. The expansion joint structure according to claim 6, characterized in that: There are two connecting members (410), and the two connecting members (410) are respectively located on both sides of the mounting hole (110) along the axial direction of the first cylinder (100), and the two ends of the limiting rod (420) are respectively connected to a corresponding one of the connecting members (410).
8. The expansion joint structure according to any one of claims 1 to 3, characterized in that: There are a plurality of the limiting components (400), and the plurality of limiting components (400) are evenly distributed along the circumference of the corrugated tube (300).
9. Rapid cooling heat exchanger, characterized in that: It comprises a shell (10) and an expansion joint structure (40) according to any one of claims 1 to 8, wherein the first cylinder (100) is coaxial with the shell (10), and both ends of the first cylinder (100) are connected to the shell (10).
10. The quench heat exchanger according to claim 9, characterized in that: The second cylinder (200) is coaxial with the shell (10), the distance between the inner wall of the second cylinder (200) and the axis of the second cylinder (200) is a, the distance between the inner wall of the shell (10) and the axis of the shell (10) is b, and a≥b.