CN115574649A - Double-tube-plate heat exchanger and machining and forming method thereof - Google Patents
Double-tube-plate heat exchanger and machining and forming method thereof Download PDFInfo
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- CN115574649A CN115574649A CN202211479590.1A CN202211479590A CN115574649A CN 115574649 A CN115574649 A CN 115574649A CN 202211479590 A CN202211479590 A CN 202211479590A CN 115574649 A CN115574649 A CN 115574649A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/04—Arrangements for sealing elements into header boxes or end plates
- F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
- F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
- F28F9/262—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators
- F28F9/268—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators by permanent joints, e.g. by welding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Details Of Heat-Exchange And Heat-Transfer (AREA)
Abstract
The invention discloses a double-tube-plate heat exchanger and a processing and forming method thereof, and relates to the technical field of heat exchangers. The double-tube-plate heat exchanger comprises an inner tube plate and an outer tube plate, wherein the inner tube plate is positioned on the inner side of the outer tube plate, a first mounting hole is formed in the inner tube plate, and a first heat exchange tube is welded in the first mounting hole; and a second mounting hole is formed in the outer tube plate, a second heat exchange tube is arranged in the second mounting hole, and the inner end face of the second heat exchange tube is connected with the outer end face of the first heat exchange tube. The processing and forming method comprises the following steps: welding the first heat exchange tube with the inner tube plate; assembling an outer tube sheet, determining the relative position between the inner and outer tube sheets; penetrating a second heat exchange tube into the outer tube plate; butt welding the first heat exchange tube and the second heat exchange tube; and fixedly connecting the second heat exchange tube with the outer tube plate. The connection strength and the sealing performance between the heat exchange tube and the inner tube plate can be obviously improved, and the service life of the double-tube-plate heat exchanger is prolonged.
Description
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a double-tube plate heat exchanger and a processing and forming method thereof.
Background
With the development of science and technology, the heat exchanger is used as special equipment for medium heat exchange and is widely applied to industries such as petroleum, chemical engineering, pharmacy, nuclear power and the like. The structure of the existing double-tube plate heat exchanger comprises: the heat exchange tube comprises a shell pass tube body, tube boxes are arranged at two ends of the shell pass tube body respectively, two tube plates, namely double tube plates, are arranged between the shell pass tube body at each end and a corresponding tube box respectively, an outer tube plate and an inner tube plate are arranged on the double tube plates at each end from outside to inside respectively, a plurality of tube holes are formed in the inner tube plate and the outer tube plate at each end, the tube holes in the inner tube plate and the outer tube plate at each end correspond to each other one by one, a circular isolation cavity tube body is welded between the inner tube plate and the outer tube plate at each end, an isolation cavity is formed between the inner tube plate and the outer tube plate at each end and the circular isolation cavity body, a heat exchange tube is arranged in the shell pass tube body, two ends of the heat exchange tube extend out of the tube holes in the outer tube plate from the tube holes in the inner tube plate at the corresponding ends respectively, the heat exchange tube is in expansion sealing connection with the tube holes in the inner tube plate, and the heat exchange tube is welded and fixed with the tube holes in expansion sealing connection with the outer tube plate.
In summary, the conventional double-tube plate heat exchanger adopts a whole heat exchange tube connected with an inner tube plate and an outer tube plate, the heat exchange tube and the inner tube plate are sealed by expansion, that is, the heat exchange tube is placed in the tube hole, and the heat exchange tube is expanded by a tube expander to make the heat exchange tube tightly attached to the inner tube plate, so as to achieve the purpose of sealing. The heat exchange tube and the inner tube plate are high in sealing manufacturing difficulty, and the sealing effect is reduced and leakage is generated due to the fact that the adhesion force is reduced due to the fact that expansion and contraction are generated due to temperature difference, displacement is generated due to external force or long-term working fatigue and the like in use.
Disclosure of Invention
The invention aims to: in order to solve the existing problems, the double-tube-plate heat exchanger and the processing and forming method thereof are provided, so that the connection strength and the sealing performance between the heat exchange tube and the inner tube plate can be obviously improved, and the service life of the double-tube-plate heat exchanger can be prolonged.
The technical scheme adopted by the invention is as follows:
a double-tube-plate heat exchanger comprises an inner tube plate and an outer tube plate, wherein the inner tube plate is positioned on the inner side of the outer tube plate, a first mounting hole is formed in the inner tube plate, and a first heat exchange tube is welded in the first mounting hole; and a second mounting hole is formed in the outer tube plate, a second heat exchange tube is arranged in the second mounting hole, and the inner end face of the second heat exchange tube is connected with the outer end face of the first heat exchange tube.
Optionally, the distance between the outer end face of the first heat exchange tube and the outer end face of the inner tube plate is 4 to 15mm.
Optionally, the outer end face of the first heat exchange tube and the inner end face of the second heat exchange tube have the same size and are coaxial.
Optionally, the first heat exchange tube and the second heat exchange tube are connected into a whole through welding.
Optionally, the second heat exchange tube is fixedly connected with the outer tube plate.
A machining and forming method of a double-tube plate heat exchanger comprises the following steps:
the method comprises the following steps: welding the first heat exchange tube with the inner tube plate;
step two: assembling the outer tube sheet, determining the relative position between the inner tube sheet and the outer tube sheet;
step three: penetrating a second heat exchange tube into the outer tube plate;
step four: butt welding the first heat exchange tube and the second heat exchange tube;
step five: and fixedly connecting the second heat exchange tube with the outer tube plate.
Optionally, in the first step, the first heat exchange tube and the inner tube plate are welded in a manner of bonding expansion of strength welding or strength welding bonding or sealing welding bonding strength expansion or strength welding bonding strength expansion.
Optionally, in the first step, the first heat exchange tube is welded to the outer end face of the inner tube plate, and the distance between the outer end face of the first heat exchange tube and the outer end face of the inner tube plate is 4 to 15mm.
Optionally, in the fourth step, the first heat exchange tube and the second heat exchange tube are welded by inner hole welding.
Alternatively, in the fourth step: after each row of first heat exchange tubes and the second heat exchange tubes at corresponding positions are subjected to butt welding, the inner hole welding quality is detected through nondestructive testing and/or leakage testing, and then the next row of first heat exchange tubes and the second heat exchange tubes are welded.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the double-tube-plate heat exchanger disclosed by the invention, the first heat exchange tube is welded with the inner tube plate, so that the problem of sealing between the heat exchange tube and the inner tube plate in the prior art can be solved. The heat exchange tube is suitable for the conditions of high shell-side pressure, large tube-shell-side temperature difference, high or extreme damage of shell-side media, noble substances of the shell-side media, large shell-side fluid fluctuation, obvious vibration of the heat exchange tube, no leakage of the shell-side media and the like.
2. According to the processing and forming method of the double-tube-plate heat exchanger, operation is carried out according to the steps provided by the method, and the sealing performance of the heat exchange tube and the inner tube plate can be guaranteed; the heat exchange tubes are operated in sections, so that the manufacturing difficulty can be reduced, and the operation is convenient; and the butt joint precision of the first heat exchange tube and the second heat exchange tube can be ensured, and the problem of leakage caused by insufficient sealing performance of the heat exchange tubes due to sectional arrangement is avoided.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of a double tube sheet heat exchanger.
Fig. 2 is a flow chart of a method for forming a double tube plate heat exchanger.
The labels in the figure are: 1-an inner tube plate, 2-an outer tube plate, 3-a first heat exchange tube and 4-a second heat exchange tube.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
A double-tube plate heat exchanger, as shown in fig. 1, includes an inner tube plate 1 and an outer tube plate 2, where the inner tube plate 1 is located at the inner side of the outer tube plate 2, a first mounting hole is formed in the inner tube plate 1, and a first heat exchange tube 3 is arranged in the first mounting hole; and a second mounting hole is formed in the outer tube plate 2, a second heat exchange tube 4 is arranged in the second mounting hole, and the inner end face of the second heat exchange tube 4 is connected with the outer end face of the first heat exchange tube 3.
Specifically, in the traditional double tube sheet, because have longer distance between interior tube sheet 1 and the outer tube sheet 2, the outer terminal surface of heat exchange tube is far away apart from interior tube sheet 1's outer terminal surface, can't directly weld heat exchange tube and interior tube sheet 1, often adopt the expanded joint to seal, not only sealed degree of difficulty is high, life receives the influence of temperature, pressure etc. great, under long-term use, the heat exchange tube vibration still can lead to interior tube sheet 1 and the junction of heat exchange tube to appear becoming flexible, thereby influence sealed effect, lead to the shell side medium to leak even.
The invention provides a double-tube plate heat exchanger, which is characterized in that a heat exchange tube is divided into a first heat exchange tube 3 and a second heat exchange tube 4 which are respectively connected with an inner tube plate 1 and an outer tube plate 2, so that the problem that the heat exchange tube is too long and cannot be welded with the inner tube plate 1 can be solved. And the end faces of the first heat exchange tube 3 and the second heat exchange tube 4 are connected so as to be able to be used as a whole heat exchange tube.
Due to the adoption of the scheme, the first heat exchange tube 3 is connected with the inner tube plate 1 in a welding mode, compared with an expansion connection mode adopted by a traditional double tube plate, the connection strength and the sealing performance between the heat exchange tube and the inner tube plate 1 can be obviously improved, and the problem that a shell pass medium is easy to leak when the shell pass medium is used for a long time is solved.
In another specific embodiment, the distance between the outer end face of the first heat exchange tube 3 and the outer end face of the inner tube plate 1 is 4 to 15mm. In combination with the above description, in order to enable the first heat exchange tube 3 to be welded to the inner tube plate 1, the length of the first heat exchange tube 3 extending out of the inner tube plate 1 should be controlled, and the extending length of 4 to 15mm enables the first heat exchange tube to be welded, that is, the heat exchange tube is disconnected at a position 4 to 15mm away from the outer end surface of the inner tube plate 1, and the heat exchange tube is connected after being welded to the inner tube plate 1.
As another specific embodiment, the outer end surface of the first heat exchange tube 3 and the inner end surface of the second heat exchange tube 4 are the same in size and are coaxial. The integrity of the first heat exchange tube 3 and the second heat exchange tube 4 can be increased and the impact on the joint due to inconsistent pressure can be prevented, thereby increasing the reliability of the connection.
As another specific embodiment, the first heat exchange tube 3 and the second heat exchange tube 4 are connected into a whole by welding. The first heat exchange tube 3 and the second heat exchange tube 4 can be integrated into a single structure by welding, sealing performance can be increased, and structural rigidity at the junction can be increased.
As another specific embodiment, the second heat exchange tube 4 is fixedly connected to the outer tube plate 2. The position of the outer tube plate 2 can be fixed, and the second heat exchange tube 4 can be fixed, and further, the second heat exchange tube can be fixedly connected by adopting the conventional mode, such as welding and expansion joint.
A method for processing and forming a double-tube plate heat exchanger is shown in figure 2 and comprises the following steps:
the method comprises the following steps: welding the first heat exchange tube 3 and the inner tube plate 1;
step two: assembling the outer tube sheet 2, determining the relative position between the inner tube sheet 1 and the outer tube sheet 2;
step three: penetrating a second heat exchange tube 4 into the outer tube plate 2;
step four: the first heat exchange tube 3 and the second heat exchange tube 4 are butt-welded;
step five: the second heat exchange tube 4 is fixedly connected with the outer tube plate 2.
Specifically, first, the first heat exchange tube 3 is welded to the inner tube plate 1, so that positioning can be provided for subsequent steps, and if the outer tube plate 2 is assembled first and then the first heat exchange tube 3 and the inner tube plate 1 are welded, the outer tube plate 2 blocks the welding position, so that welding cannot be performed. Due to the adoption of the scheme, the first heat exchange tube 3 is welded with the inner tube plate 1, and compared with an expansion joint mode adopted by a traditional double-tube plate, the expansion joint device can obviously improve the connection strength and the sealing performance between the heat exchange tube and the inner tube plate 1, and further solve the problem that a shell pass medium is easy to leak after long-term use.
Further, the outer tube plate 2 is determined to be assembled, wherein the specific mode for assembling the outer tube plate 2 needs to be selected according to the overall structure of the double-tube-plate heat exchanger, the assembling mode is a conventional mode, the assembling mode is used for determining the relative position between the inner tube plate 1 and the outer tube plate 2, and a foundation can be provided for fixing the second heat exchange tube 4 after the position is determined, so that the second heat exchange tube 4 and the first heat exchange tube 3 can be conveniently welded.
Further, a second heat exchange tube 4 is penetrated through the outer tube sheet 2. Based on the consideration of the pipe threading degree of difficulty, when first heat exchange tube 3 and second heat exchange tube 4 weld, can lead to warping because of the welding, if weld the back at first heat exchange tube 3 and second heat exchange tube 4, penetrate outer tube plate 2 with the heat exchange tube is whole, the heat exchange tube is because of warping and can't aim at the tube hole easily, consequently, should be before the butt joint of heat exchange tube with second heat exchange tube 4 penetrates outer tube plate 2.
Further, the first heat exchange tube 3 and the second heat exchange tube 4 are butt-welded. This step enables the first heat exchange tube 3 to be connected to the second heat exchange tube 4 for use as a unitary heat exchange tube. Specifically, based on the welding requirement, the first heat exchange tube 3 and the second heat exchange tube 4 should be welded, and then the second heat exchange tube 4 and the outer tube plate 2 are connected, otherwise, an error is easily generated in the butt joint position of the first heat exchange tube 3 and the second heat exchange tube 4, which results in that the welding requirement cannot be met.
In the specific implementation, the first heat exchange tubes 3 and the second heat exchange tubes 4 are welded in a penetrating manner according to the sequence of each row, that is, after the first heat exchange tubes 3 of each row penetrate the outer tube plate 2, the first heat exchange tubes 3 of the next row are welded in a butt joint manner with the second heat exchange tubes 4 of the corresponding positions, and then the first heat exchange tubes 3 of the next row penetrate the outer tube plate 2 and are welded in a butt joint manner with the second heat exchange tubes 4 of the next row of corresponding positions. Otherwise, the first heat exchange tube 3 which is not welded may block the first heat exchange tube 3 which is being welded, resulting in failure of welding.
Finally, the second heat exchange tube 4 is fixedly connected with the outer tube plate 2. The position of the outer tube plate 2 can be fixed, and the second heat exchange tube 4 can be fixed, and further, the second heat exchange tube can be fixedly connected by adopting the conventional method, such as welding and expansion joint.
Through the steps, the heat exchange tube is divided into the first heat exchange tube 3 and the second heat exchange tube 4, and then butt joint is carried out, so that the problem that the conventional heat exchange tube is too long and cannot be welded with the inner tube plate 1 is solved, and the connection strength and the sealing performance between the heat exchange tube and the inner tube plate 1 can be ensured; the butt joint precision of the first heat exchange tube 3 and the second heat exchange tube 4 can be ensured, and the problem of leakage caused by insufficient sealing performance of the heat exchange tubes due to sectional arrangement is avoided; and the difficulty of installation and operation among the first heat exchange tube 3, the inner tube plate 1, the second heat exchange tube 4 and the outer tube plate 2 is ensured.
In another specific embodiment, in the step one, the first heat exchange tube 3 and the inner tube plate 1 are welded by a strength welding or strength welding bonding expansion or seal welding bonding strength expansion or strength welding bonding strength expansion. The strength of the connection between the first heat exchange tubes 3 and the inner tube sheet 1 can be improved. Specifically, the above-mentioned scheme is only preferred, and other welding methods capable of improving the welding strength can be adopted in specific implementation.
As another specific embodiment, in the first step, the first heat exchange tube 3 is welded to the outer end surface of the inner tube plate 1, and the distance between the outer end surface of the first heat exchange tube 3 and the outer end surface of the inner tube plate 1 is 4 to 15mm. In order to weld the first heat exchange tube 3 to the inner tube plate 1, the length of the first heat exchange tube 3 extending out of the inner tube plate 1 should be controlled, and the extending length of 4 to 15mm enables welding.
In the fourth step, the first heat exchange tube 3 and the second heat exchange tube 4 are welded by inner hole welding. The inner hole welding finger leads an inner hole welding machine to penetrate into a welding seam from the inside of the tube for butt joint, and when the first heat exchange tube 3 and the second heat exchange tube 4 are welded, because the tube diameter of the heat exchange tubes is small, and the distance between the heat exchange tubes is short, the heat exchange tubes cannot be welded from the outside, so the inner hole welding is needed in the method.
As another specific embodiment, in the fourth step: after each row of the first heat exchange tubes 3 and the second heat exchange tubes 4 at the corresponding positions are subjected to butt welding, the inner hole welding quality is detected through nondestructive detection and/or leakage detection, and then the next row of the first heat exchange tubes 3 and the second heat exchange tubes 4 are welded. The welding quality of the heat exchange tubes can be detected, and the problem that leakage is caused to occur due to insufficient welding precision between the first heat exchange tube 3 and the second heat exchange tube 4 is solved. As described above, in order to prevent the first heat exchange tubes 3 from being blocked therebetween, which results in the failure of the inspection, the inspection should be performed after each row of the heat exchange tubes is welded.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the double-tube-plate heat exchanger disclosed by the invention, the first heat exchange tube 3 is welded with the inner tube plate 1, so that the problem of sealing between the heat exchange tube and the inner tube plate 1 in the prior art can be solved. The shell-side heat exchanger is suitable for the conditions of higher shell-side pressure, larger shell-side temperature difference, high or extremely harmful shell-side medium, noble substances in the shell-side medium, larger shell-side fluid fluctuation, more obvious vibration of a heat exchange tube, no leakage of the shell-side medium and the like.
2. According to the processing and forming method of the double-tube-plate heat exchanger, operation is carried out according to the steps provided by the method, and the sealing performance of the heat exchange tube and the inner tube plate 1 can be guaranteed; the heat exchange tubes are operated in sections, so that the manufacturing difficulty can be reduced, and the operation is convenient; and the butt joint precision of the first heat exchange tube 3 and the second heat exchange tube 4 can be ensured, and the problem of leakage caused by insufficient sealing performance of the heat exchange tubes due to sectional arrangement is avoided.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (10)
1. A double tube sheet heat exchanger which is characterized in that: the heat exchanger comprises an inner pipe plate (1) and an outer pipe plate (2), wherein the inner pipe plate (1) is positioned on the inner side of the outer pipe plate (2), a first mounting hole is formed in the inner pipe plate (1), and a first heat exchange pipe (3) is welded in the first mounting hole; and a second mounting hole is formed in the outer pipe plate (2), a second heat exchange pipe (4) is arranged in the second mounting hole, and the inner end face of the second heat exchange pipe (4) is connected with the outer end face of the first heat exchange pipe (3).
2. The double tube sheet heat exchanger of claim 1, wherein: the distance between the outer end face of the first heat exchange tube (3) and the outer end face of the inner tube plate (1) is 4 to 15mm.
3. The double tube sheet heat exchanger of claim 1, wherein: the outer end face of the first heat exchange tube (3) and the inner end face of the second heat exchange tube (4) are the same in size and are coaxial.
4. The double tube sheet heat exchanger of claim 1, wherein: the first heat exchange tube (3) and the second heat exchange tube (4) are connected into a whole through welding.
5. The double tube sheet heat exchanger of claim 1, wherein: the second heat exchange tube (4) is fixedly connected with the outer tube plate (2).
6. A processing and forming method of a double-tube plate heat exchanger is characterized in that: the method comprises the following steps:
the method comprises the following steps: welding the first heat exchange tube (3) and the inner tube plate (1);
step two: assembling an outer tube sheet (2) and determining the relative position between the inner tube sheet (1) and the outer tube sheet (2);
step three: penetrating a second heat exchange tube (4) into the outer tube plate (2);
step four: the first heat exchange tube (3) and the second heat exchange tube (4) are butt-welded;
step five: and fixedly connecting the second heat exchange tube (4) with the outer tube plate (2).
7. The method for forming a double tube sheet heat exchanger according to claim 6, wherein: in the first step, the first heat exchange tube (3) and the inner tube plate (1) are welded in a mode of bonding expansion of strength welding or strength welding bonding or sealing welding bonding strength expansion or strength welding bonding strength expansion.
8. The method for forming a double tube sheet heat exchanger according to claim 6, wherein: in the first step, the first heat exchange tube (3) is welded with the outer end face of the inner tube plate (1), and the distance between the outer end face of the first heat exchange tube (3) and the outer end face of the inner tube plate (1) is 4-15mm.
9. The method for forming a double tube sheet heat exchanger according to claim 6, wherein: in the fourth step, the first heat exchange tube (3) and the second heat exchange tube (4) are welded through inner hole welding.
10. The method for forming a double tube sheet heat exchanger as claimed in claim 9, wherein: in the fourth step: after each row of first heat exchange tubes (3) and the second heat exchange tubes (4) at the corresponding positions are in butt welding, the inner hole welding quality is detected through nondestructive testing and/or leakage testing, and then the next row of first heat exchange tubes (3) and the second heat exchange tubes (4) are welded.
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| CN202211479590.1A CN115574649B (en) | 2022-11-24 | 2022-11-24 | Double-tube-plate heat exchanger and machining and forming method thereof |
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