Gas-liquid tubular heat exchanger
By setting expansion joints in the gas-liquid tube heat exchanger and setting the elbow on the outside of the shell, the problem of leakage and maintenance of the heat exchanger's welds is solved, and the weld sealing and equipment reliability are improved.
Patent Information
- Application Number
- CN202420384923.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-02-28
AI Technical Summary
During the overtemperature and overpressure operation of gas-liquid tube heat exchangers, leakage is prone to occur at the weld position, resulting in liquid and gas contact, affecting product quality, and it is difficult to find leakage points in the cover wrapping, which is difficult to repair.
A gas-liquid tube-type heat exchanger is designed, and expansion joints are set to absorb the thermal expansion displacement of the heat exchange tube, avoid cracking of the weld, and the elbow is set outside the shell for easy observation and maintenance.
By setting up expansion joints, weld sealing is ensured, leakage problems are avoided, and the reliability of equipment and product quality are improved due to the simple structure and easy maintenance.
Smart Images
Figure CN222578283U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of heat exchangers, and in particular relates to a gas-liquid tube type heat exchanger. Background Art
[0002] Gas-liquid tube heat exchangers are widely used in industrial production, such as superheaters and economizers of industrial boiler equipment; air heaters in drying and drying systems; air preheaters in waste incineration power generation; heat exchangers in steelmaking, steel rolling and galvanized sheet production processes are all examples of gas-liquid tube heat exchangers. In the production process of the petrochemical industry, the occasions for the application of heat exchangers are countless.
[0003] It can be seen that the importance of gas-liquid tubular heat exchangers in industry. The commonly used tubular heat exchangers on the market have elbows and header pipes wrapped on the inside of the cover. During the use of the equipment, leakage often occurs at the welds between the heat pipes and the elbows. The reason is that on the one hand, the heat exchanger is operating at over-temperature and over-pressure, and on the other hand, there are defects in the welding quality. Not only does it cause the liquid in the tube to contact the gas in the shell, the composition of the gas changes, which directly or indirectly affects the quality of the product and causes significant losses to the owner, but the cover wraps the elbow, making it difficult to find the leakage point, which brings huge obstacles to equipment maintenance. Utility Model Content
[0004] The purpose of the utility model is to provide a gas-liquid tube heat exchanger to solve the problems raised in the above background technology.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a gas-liquid tube heat exchanger, comprising a shell, a smoke inlet is provided on the upper side of the shell, a smoke outlet is provided on the lower side of the shell, a plurality of groups of heat exchange tubes are arranged in sequence along the smoke flow direction in the shell, an expansion joint is provided on one side of the shell, adjacent heat exchange tubes are connected by elbows, the elbows are respectively provided on the outside of the shell, and the outermost ends of the heat exchange tubes are respectively connected to two headers.
[0006] Preferably, a front tube sheet and a rear tube sheet are provided on the shell, the rear tube sheet is connected to an expansion joint, and the heat exchange tubes pass through the front tube sheet and the rear tube sheet.
[0007] Preferably, the heat exchange tube is a finned heat exchange tube.
[0008] Preferably, the elbow is a U-shaped elbow.
[0009] Preferably, the two headers are connected to the liquid inlet and the liquid outlet respectively.
[0010] Preferably, C-shaped steel is provided on the shell.
[0011] Preferably, the expansion joint is a U-shaped expansion bellows.
[0012] The technical effects and advantages of the utility model are as follows: the gas-liquid tube heat exchanger has a simple structure, is easy to observe, and is convenient to maintain. It has strong applicability in gas-liquid tube heat exchangers, and an expansion joint is provided to avoid weld cracking caused by displacement caused by thermal expansion of the heat exchange tube, thereby ensuring the sealing of the weld and the product quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of the utility model;
[0014] Figure 2 It is a side view structural schematic diagram of the utility model;
[0015] Figure 3 It is a schematic diagram of the top structure of the utility model.
[0016] In the figure: 1. front tube sheet; 2. flue gas inlet; 3. flue gas outlet; 4. rear tube sheet; 5. expansion joint; 6. heat exchange tube; 7. elbow; 8. header; 9. C-shaped steel. DETAILED DESCRIPTION
[0017] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0018] The utility model provides Figure 1-3 A gas-liquid tube heat exchanger shown in the figure includes a shell, and a C-shaped steel 9 is welded on the edge of the shell to increase the strength of the shell. The shell is a channel that runs through from top to bottom. A flue gas inlet 2 is provided on the upper side of the shell, and a flue gas outlet 3 is provided on the lower side of the shell. The left side of the shell is a front tube sheet 1, and the right side of the shell is connected to the rear tube sheet 4 through an expansion joint 5. The heat exchange tube 6 passes through the front tube sheet 1 and the rear tube sheet 4 and is welded, and spans the shell. A plurality of groups of heat exchange tubes 6 are arranged in sequence along the flue gas flow direction in the shell. The heat exchange tubes 6 are finned heat exchange tubes. Adjacent heat exchange tubes 6 are connected by elbows 7. The elbows 7 are U-shaped elbows. No cover plate is provided on the outside of the elbows 7 for easy observation and maintenance. The elbows 7 are respectively arranged on the outside of the shell. The outermost ends of the heat exchange tubes 6 are respectively connected to two headers 8, and the two headers 8 are respectively connected to the liquid inlet and the liquid outlet. The liquid enters from the liquid inlet and is discharged from the liquid outlet through the heat exchange tubes 6, and exchanges heat with the flue gas entering from the flue gas inlet 2 in the shell.
[0019] During the use of the gas-liquid tube heat exchanger, when the heat exchange tube 6 is heated, there is thermal expansion, and the expansion joint 5 on the rear tube plate 4 absorbs the displacement caused by the thermal expansion to prevent the weld of the heat exchange tube 6 from being cracked after being heated.
[0020] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A gas-liquid tube heat exchanger, comprising a shell, characterized in that: The upper side of the shell is provided with a smoke inlet (2), the lower side of the shell is provided with a smoke outlet (3), a plurality of groups of heat exchange tubes (6) are arranged in sequence at intervals along the direction of smoke flow in the shell, an expansion joint (5) is arranged on one side of the shell, adjacent heat exchange tubes (6) are connected via elbows (7), the elbows (7) are respectively arranged on the outside of the shell, and the outermost ends of the heat exchange tubes (6) are respectively connected to two headers (8).
2. The gas-liquid tube heat exchanger according to claim 1, characterized in that: A front tube sheet (1) and a rear tube sheet (4) are arranged on the shell, the rear tube sheet (4) is connected to an expansion joint (5), and the heat exchange tube (6) passes through the front tube sheet (1) and the rear tube sheet (4).
3. The gas-liquid tube heat exchanger according to claim 1, characterized in that: The heat exchange tube (6) is a finned heat exchange tube.
4. The gas-liquid tube heat exchanger according to claim 1, characterized in that: The elbow (7) is a U-shaped elbow.
5. The gas-liquid tube heat exchanger according to claim 1, characterized in that: The two headers (8) are connected to the liquid inlet and the liquid outlet respectively.
6. The gas-liquid tube heat exchanger according to claim 1, characterized in that: The shell is provided with C-shaped steel (9).
7. The gas-liquid tube heat exchanger according to claim 1, characterized in that: The expansion joint (5) is a U-shaped expansion bellows.