Exhaust and drainage structure of plate-fin heat exchanger
By fixing the discharge pipe inside the first seal of the plate-fin heat exchanger, the problem of inability to effectively exhaust and drain after the water pressure test is solved, and safe and stable exhaust and drainage and energy consumption are achieved.
Patent Information
- Application Number
- CN202421630096.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-10
AI Technical Summary
The existing plate-fin heat exchanger cannot effectively exhaust and drain water after the hydraulic pressure test, which poses safety risks and high energy consumption.
A plate-fin heat exchanger exhaust drainage structure is designed. By fixing the discharge pipe inside the first sealing head, one port of the discharge pipe is limited to the top or bottom end of the inner part of the first sealing head, and the other port is in communication with the outside world, and is used to exhaust gas or water inside the heat exchanger.
It realizes safe and stable exhaust and drainage, avoids the risk of not being able to completely empty after water pressure test, reduces energy consumption, and improves operation safety and control accuracy.
Smart Images
Figure CN222912499U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat exchangers, and particularly relates to an exhaust and drainage structure of a plate-fin heat exchanger. Background Technique
[0002] The main body material of a large plate-fin heat exchanger is generally aluminum alloy, which is mostly applicable to low-temperature fields and usually has multiple channels. After manufacturing is completed, each channel needs to be subjected to a pressure test separately, and a hydrostatic test or a pneumatic test is adopted according to the level of the strength test pressure value. When the test pressure value is relatively high, a hydrostatic test is generally taken to verify its pressure-bearing capacity and sealing performance, and the water needs to be drained completely after the test.
[0003] When the number of fluid streams of the plate-fin heat exchanger is large or in order to reduce the local resistance of the guide vane, the inlet and outlet of a certain channel of the plate-fin heat exchanger are usually arranged in the middle of both ends of the core body.
[0004] In the factory, it is often placed horizontally. When injecting water into this channel, due to gas pressure buildup in the space of the core body and the head body above the water injection port (usually an equipment nozzle), the water cannot completely fill the space, and there is a gas phase space with a volume of nearly half. The hydrostatic test pressure is as high as 13.0 MPa or higher. If it fails suddenly, the safety risk is relatively high, and it also does not conform to the provisions of Article 10.7.4 of JB / T4734-2002 "Aluminum Welded Containers": "Air in the container should be completely exhausted during the hydrostatic test".
[0005] The plate-fin heat exchanger is mostly used in low-temperature working conditions. For the plate-fin heat exchangers supporting natural gas liquefaction devices, air separation devices and other fields, it is generally required that the water dew point in the channel is lower than -70 °C. After the hydrostatic test, the water in the channel needs to be drained completely and dried with air. When the inlet and outlet of the channel are arranged in the middle of the core body end, the free water in the volume below the water injection port (i.e., the equipment nozzle) of this channel cannot be completely discharged, and a large amount of hot air is often used for blowing and evaporation, resulting in high energy consumption.
[0006] In response to the above problems of exhaust and drainage, there are generally two methods commonly used in the industry:
[0007] The first method: When the length of the core body of the plate-fin heat exchanger is relatively short, generally less than 4 m, with the help of the workshop crane, the heat exchanger is lifted from the horizontal state to the vertical state and fixed with a steel structure support, and then the hydrostatic test is carried out. According to this method, there is a nozzle at the highest point for installing a pressure gauge and exhausting air during the hydrostatic test, and another nozzle at the lowest point for water injection and draining water after the hydrostatic test.
[0008] Although the problems of exhaust and drainage are solved, there are also the following disadvantages:
[0009] 1. The structural dimensions such as the width and thickness of each plate-fin heat exchanger are different, and it takes a certain amount of labor and material costs to manufacture the steel structure support;
[0010] 2. Manufacturing and storage require a large amount of workshop space;
[0011] 3. When the heat exchanger is rotated between the horizontal state and the vertical state, safety risks such as hoist failure are increased.
[0012] The second method: When the length of the plate-fin heat exchanger core is greater than 4 - 6 meters, due to height restrictions, the workshop cannot change the direction. In the horizontal state, a through-hole is drilled at the highest point of the head body to connect the screw, and after the test, this hole is welded and sealed. This solves the problems of exhaust during the hydrostatic test and drainage after the test, but there are also the following disadvantages:
[0013] 1. This hole is welded after the pressure test, and the welded and sealed part has not undergone a strength test, which does not meet the requirements of the national mandatory inspection and supervision specifications;
[0014] 2. The hole diameter is small, and it is impossible to ensure full penetration during welding and sealing;
[0015] 3. After welding and sealing the through-hole, there are obvious traces, which affect the appearance. Utility Model Content
[0016] The purpose of the present utility model is to provide a plate-fin heat exchanger exhaust and drainage structure to solve the above technical problems.
[0017] The embodiment of the present utility model is realized through the following technical solutions: A plate-fin heat exchanger exhaust and drainage structure, the heat exchanger includes a core body, and a first head and a second head respectively connected to the middle of both ends of the core body. An outlet is provided in the middle of the first head, and an inlet is provided in the middle of the second head. A discharge pipe is fixed inside the first head, one end of the discharge pipe is limited to the top or bottom inside the first head, and the other end is communicated with the outside.
[0018] Further, there is a gap between the discharge pipe and the inner wall of the first head for eliminating water tension.
[0019] Further, the port of the discharge pipe placed at the top or bottom inside the first head is an inclined port, and the inclined port faces the inner wall of the first head.
[0020] Further, the outlet is provided with a test end cover, a connection hole communicated with the discharge pipe is opened on the test end cover, and a switch member for controlling the opening and closing of the connection hole is welded on the end cover.
[0021] Preferably, a pressure gauge for detecting the internal pressure of the heat exchanger is further provided on the test end cover.
[0022] Further, the inner diameter of the discharge pipe is 5 mm - 20 mm.
[0023] The utility model has at least the following advantages and beneficial effects: By fixing a discharge pipe with one port limited to the top or bottom inside the first head and the other port communicating with the outside, the gas or water inside the heat exchanger can be completely discharged, which is safe and stable and has a good discharge effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for use in the embodiments will be briefly introduced below for easy understanding. The following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.
[0025] Figure 1 FIG. 1 is a schematic structural diagram of an exhaust and drainage structure of a plate-fin heat exchanger provided in Embodiment 1 of the present utility model;
[0026] Figure 2 FIG. 2 is a schematic structural diagram of an exhaust and drainage structure of a plate-fin heat exchanger provided in Embodiment 2 of the present utility model;
[0027] Reference numerals: 1 - heat exchanger, 10 - core body, 11 - first head, 12 - second head, 13 - outlet, 14 - inlet, 2 - discharge pipe, 3 - gap, 4 - test end cover, 40 - connection hole, 41 - switch member, 5 - pressure gauge. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the drawings here can be arranged and designed in various different configurations.
[0029] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.
[0030] Embodiment 1
[0031] As Figure 1As shown, in this embodiment, a plate-fin heat exchanger exhaust and drainage structure is mainly disclosed, which is particularly suitable for a channel in which a heat exchanger head pipe is arranged in the middle of the two ends of the core body. The heat exchanger 1 includes a core body 10 and a first head 11 and a second head 12 respectively brazed in the middle of the two ends of the core body 10. An outlet 13 is arranged in the middle of the first head 11, and an inlet 14 is arranged in the middle of the second head 12. A discharge pipe 2 is fixed in the first head 11. Specifically, the inner diameter of the discharge pipe 2 can be 5mm to 20mm. One end of the discharge pipe 2 is limited to the top of the first head 11, that is, the highest point of the core body 10, and the other end is connected to the outside. During the water pressure test, the water hole enters the heat exchanger 1 from the inlet 14. As the water level rises, the gas in the upper space is continuously discharged from the discharge pipe 2. When water is continuously discharged from the discharge pipe 2, it means that the inside of the heat exchanger 1 is full of water and the gas has been exhausted. In this case, the discharge pipe 2 acts as an exhaust pipe.
[0032] Furthermore, in a specific implementation, there is a gap 3 between the above-mentioned discharge pipe 2 and the inner wall of the first head 11 provided in the embodiment of the utility model for eliminating water tension. It should be noted that due to the tension of water, if the gap 3 is small, during the water pressure test, that is, when water is introduced into the heat exchanger 1, air pockets will be generated between the inner wall of the first head 11 and the discharge pipe 2, and it is not easy to fill the water completely. Therefore, by ensuring that the gap 3 is large to eliminate the water tension, the discharge effect is improved.
[0033] Furthermore, in a specific implementation, the port of the discharge pipe 2 provided in the embodiment of the utility model disposed at the top of the first head 11 is an oblique opening, and the oblique opening faces the inner wall of the first head 11, which can help better guide the gas to be exhausted.
[0034] Furthermore, in the specific implementation, the outlet 13 provided in the embodiment of the utility model is provided with a test end cover 4, on which a connection hole 40 communicating with the discharge pipe 2 is opened, and a switch 41 for controlling the opening and closing of the connection hole 40 is welded on the end cover, thereby controlling the opening and closing of the discharge pipe 2. It should be noted that the switch 41 can be realized by using a screw plug and a screw plug sleeve structure in the prior art. In addition, a pressure gauge 5 for detecting the internal pressure of the heat exchanger 1 is also provided on the test end cover 4, which can monitor the pressure inside the heat exchanger 1 in real time, thereby improving the safety of operation and the accuracy of control.
[0035] Embodiment 2
[0036] like Figure 2As shown, in this embodiment, the main structure is exactly the same as that of the first embodiment. The difference is that one port of the discharge pipe 2 is limited to the inner bottom end of the first head 11. After the hydrostatic test is completed, the water inside the heat exchanger 1 needs to be drained completely. At this time, turn the heat exchanger 1 over so that one port of the discharge pipe 2 is placed at the inner bottom end of the first head 11. Then the discharge pipe 2 can act as a drain pipe. Pass gas into the inlet 14. Under the action of air pressure, the water is discharged from the discharge pipe 2. When there is no obvious liquid water flowing out of the discharge pipe 2, it indicates that the free water inside the channel of the heat exchanger 1 is basically drained. Then cut off the test end cover 4 and perform the next drying operation. This drying operation avoids the process of heating and evaporating a large amount of free water in the channel of the heat exchanger 1, improves the drying rate, and reduces the energy consumption of the heated air.
[0037] Correspondingly, the gap 3 between the first head 11 and the discharge pipe 2 should not be too small to avoid water retention caused by the action of water tension. The port of the discharge pipe 2 placed at the inner bottom end of the first head 11 is an inclined port, which can better drain the water.
[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A plate-fin heat exchanger (1) exhaust and drainage structure, the heat exchanger (1) comprising a core (10) and a first head (11) and a second head (12) respectively connected to the middle of two ends of the core (10), the first head (11) being provided with an outlet (13) in the middle, and the second head (12) being provided with an inlet (14) in the middle, characterized in that: A discharge pipe (2) is fixed inside the first sealing head (11), one end of the discharge pipe (2) is located at the top or bottom end inside the first sealing head (11), and the other end is connected to the outside.
2. The exhaust and drainage structure of a plate-fin heat exchanger (1) according to claim 1, characterized in that: There is a gap (3) between the discharge pipe (2) and the inner wall of the first sealing head (11) for eliminating water tension.
3. The exhaust and drainage structure of a plate-fin heat exchanger (1) according to claim 1, characterized in that: The port of the discharge pipe (2) located at the top or bottom end inside the first end cap (11) is an oblique opening, and the oblique opening faces the inner wall of the first end cap (11).
4. The exhaust and drainage structure of a plate-fin heat exchanger (1) according to claim 1, characterized in that: The outlet (13) is provided with a test end cover (4), the test end cover (4) is provided with a connection hole (40) connected to the discharge pipe (2), and a switch member (41) for controlling the opening and closing of the connection hole (40) is welded on the end cover.
5. The exhaust and drainage structure of a plate-fin heat exchanger (1) according to claim 4, characterized in that: The test end cover (4) is also provided with a pressure gauge (5) for detecting the internal pressure of the heat exchanger (1).
6. The exhaust and drainage structure of a plate-fin heat exchanger (1) according to claim 1, characterized in that: The inner diameter of the discharge pipe (2) is 5 mm to 20 mm.