Catalyst retaining structure
By using a matching structure between the wire mesh compression cone and the opening pin in the catalyst holding structure, replacing the entire wire mesh and grid pressure plate, the problem of easy leakage of the catalyst is solved, and the effect of structural simplification and cost reduction is achieved.
Patent Information
- Application Number
- CN202421833089.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-31
AI Technical Summary
In the existing catalyst retaining structure, the catalyst is prone to leak through the gap between the upper wire mesh and the upper tube plate sealing surface and the gap between the lower wire mesh and the lower tube plate sealing surface, and the structure is complex and the production cost is high.
The structure in which the wire mesh compression cone cooperates with the opening pin is adopted, instead of the entire layer of wire mesh and the grid pressure plate, the first wire mesh compression cone and the second wire mesh compression cone are used to ensure that the catalyst is firmly maintained in the heat exchange pipe section.
The catalyst retaining structure is simplified, the manufacturing cost is reduced, and the catalyst leakage is effectively prevented, solving the problem of easy leakage of catalysts in the prior art.
Smart Images
Figure CN222912490U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of heat exchangers, in particular to a catalyst holding structure.
Background Art
[0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. Heat exchangers play an important role in many industrial productions such as chemical industry, petroleum, power, food and others. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators, reboilers, etc. A shell-and-tube heat exchanger mainly consists of a shell, a tube bundle, a tube sheet and a head, etc. The shell is mostly circular, and parallel tube bundles or spiral tubes are installed inside. Both ends of the tube bundle are fixed on the tube sheet. For the two fluids exchanging heat in the shell-and-tube heat exchanger, one flows inside the tubes, and its path is called the tube pass; the other flows outside the tubes, and its path is called the shell pass. The wall surface of the tube bundle is the heat transfer surface.
[0003] Please refer to Figures 1 to 3 As shown, it discloses a catalyst holding structure in the prior art, including an upper tube sheet 1`, a lower tube sheet 2` and a plurality of heat exchange tubes 3`. The free end above the heat exchange tube 3` is welded in the heat exchange tube hole of the upper tube sheet 1`, and the free end below the heat exchange tube 3` is welded in the heat exchange tube hole of the lower tube sheet 2`. A layer of upper wire mesh 4` is laid above the upper tube sheet 1`, an upper grid pressing plate 5` is arranged above the upper wire mesh 4`, and the upper grid pressing plate 5` is connected to the upper tube sheet 1` through a plurality of first fixing members 6`. A layer of lower wire mesh 7` is laid below the lower tube sheet 2`, a lower grid pressing plate 8` is arranged below the lower wire mesh 7`, and the lower grid pressing plate 8` is connected to the lower tube sheet 2` through a plurality of second fixing members 9`. A catalyst 10` is arranged inside the heat exchange tube 3`. The defects of this kind of catalyst holding structure are as follows: 1. In the actual production process, we found that the gaps between the upper wire mesh 4` and the sealing surface of the upper tube sheet 1` and between the lower wire mesh 7` and the sealing surface of the lower tube sheet 2` are difficult to control. Therefore, during use, the catalyst 10` in the heat exchange tube 3` often leaks from the gaps between the upper wire mesh 4` and the sealing surface of the upper tube sheet 1` and between the lower wire mesh 7` and the sealing surface of the lower tube sheet 2`; 2. This kind of structure is relatively complex and the production cost is relatively high.
[0004] Therefore, it is necessary to provide a catalyst holding structure to solve the above technical problems.
Content of the Utility Model
[0005] To solve the above problems, the purpose of the utility model is to provide a catalyst holding structure with a simple structure and convenient installation.
[0006] To achieve the above object, the technical solution adopted by the present utility model is as follows: A catalyst holding structure, comprising: an upper tube sheet, a lower tube sheet and a plurality of heat exchange tubes. The free end above the heat exchange tube is welded in the heat exchange tube hole of the upper tube sheet, and the free end below the heat exchange tube is welded in the heat exchange tube hole of the lower tube sheet. The upper end face of the heat exchange tube protrudes 15 - 20 mm above the upper surface of the upper tube sheet, and a first limiting member is provided on this part of the heat exchange tube section protruding above the upper surface of the upper tube sheet. The lower end face of the heat exchange tube protrudes 15 - 20 mm below the lower surface of the lower tube sheet, and a second limiting member is provided on this part of the heat exchange tube section protruding below the lower surface of the lower tube sheet. The heat exchange tube is filled with a catalyst, and a first wire mesh compression cone is provided between the catalyst and the first limiting member, and a second wire mesh compression cone is provided between the catalyst and the second limiting member.
[0007] Preferably, a catalyst holding structure in the present utility model is further provided as: The first wire mesh compression cone is compressed from stainless steel wires.
[0008] Preferably, a catalyst holding structure in the present utility model is further provided as: The second wire mesh compression cone is compressed from stainless steel wires.
[0009] Preferably, a catalyst holding structure in the present utility model is further provided as: The first limiting member is a split pin, and the split pin is radially inserted into the heat exchange tube.
[0010] Preferably, a catalyst holding structure in the present utility model is further provided as: The second limiting member is a split pin, and the split pin is radially inserted into the heat exchange tube.
[0011] Preferably, a catalyst holding structure in the present utility model is further provided as: The first wire mesh compression cone is arranged in a conical shape, and the first wire mesh compression cone is arranged with a wider upper part and a narrower lower part.
[0012] Preferably, a catalyst holding structure in the present utility model is further provided as: The second wire mesh compression cone is arranged in a conical shape, and the second wire mesh compression cone is arranged with a narrower upper part and a wider lower part.
[0013] Preferably, a catalyst holding structure in the present utility model is further provided as: The first wire mesh compression cone is arranged in a hollow shape.
[0014] Preferably, a catalyst holding structure in the present utility model is further provided as: The second wire mesh compression cone is arranged in a hollow shape.
[0015] Compared with the prior art, the utility model has the following beneficial effects: In the catalyst holding structure of the utility model, compared with the prior art, we removed the entire layer of wire mesh and the grid pressing plate, and instead adopted a structure in which the wire mesh compression cone is matched with the split pin to replace it. After the above structural improvement, not only the entire catalyst holding structure is greatly simplified, the manufacturing cost is reduced, but also the catalyst is firmly held in the heat exchange tube section between the first wire mesh compression cone and the second wire mesh compression cone, thus solving the technical problem of easy leakage of the catalyst existing in the prior art.
Description of the Drawings
[0016] Figure 1 FIG. is a schematic structural diagram of a catalyst holding structure in the prior art.
[0017] Figure 2 is Figure 1 a partial enlarged view of part A in
[0018] Figure 3 is Figure 1 a partial enlarged view of part B in
[0019] Figure 4 FIG. is a schematic structural diagram of a catalyst holding structure in the utility model.
[0020] Figure 5 is Figure 4 a partial enlarged view of part C in
[0021] Figure 6 is Figure 4 a partial enlarged view of part D in
[0022] Figures 1 to 3 In FIG.: 1`, upper tube sheet; 2`, lower tube sheet; 3`, heat exchange tube; 4`, upper wire mesh; 5`, upper grid pressing plate; 6`, first fixing member; 7`, lower wire mesh; 8`, lower grid pressing plate; 9`, second fixing member; 10`, catalyst.
[0023] Figures 4 to 6 In FIG.: 1, upper tube sheet; 10, heat exchange tube holes of the upper tube sheet; 11, upper surface; 2, lower tube sheet; 20, heat exchange tube holes of the lower tube sheet; 21, lower surface; 3, heat exchange tube; 30, upper end face; 31, lower end face; 4, first limiting member; 5, second limiting member; 6, catalyst; 7, first wire mesh compression cone; 8, second wire mesh compression cone.
Detailed Embodiment
[0024] The following further describes in detail a catalyst holding structure according to the utility model through specific embodiments.
[0025] Refer Figures 4 to 6As shown in the figure, a catalyst holding structure includes: an upper tube sheet 1, a lower tube sheet 2, and a plurality of heat exchange tubes 3. The free upper ends of the heat exchange tubes 3 are welded into the heat exchange tube holes 10 of the upper tube sheet 1, and the free lower ends of the heat exchange tubes 3 are welded into the heat exchange tube holes 20 of the lower tube sheet 2. The length that the upper end surface 30 of the heat exchange tube 3 protrudes from the upper surface 11 of the upper tube sheet 1 is 15 - 20 mm. A first limiting member 4 is provided on this part of the heat exchange tube section protruding from the upper surface of the upper tube sheet 1. In this embodiment, the first limiting member 4 is a split pin, and the split pin is radially inserted through the heat exchange tube 3. The length that the lower end surface 31 of the heat exchange tube 3 protrudes from the lower surface 21 of the lower tube sheet 2 is 15 - 20 mm. A second limiting member 5 is provided on this part of the heat exchange tube section protruding from the lower surface 21 of the lower tube sheet 2. In this embodiment, the second limiting member 5 is a split pin, and the split pin is radially inserted through the heat exchange tube 3. A catalyst 6 is filled in the heat exchange tube 3. A first wire mesh compression cone 7 is provided between the catalyst 6 and the first limiting member 4, and a second wire mesh compression cone 8 is provided between the catalyst 6 and the second limiting member 5. The reason why the protruding length of the present utility model is designed to be 15 - 20 mm is that this protruding length should not only meet the installation of the split pin but also not affect the welding of the free end of the heat exchange tube and the tube sheet. If the design is too long, although the installation of the split pin can be satisfied, it is not conducive to the welding of the free end of the heat exchange tube and the tube sheet. If the design is too short, the installation of the split pin cannot be satisfied. Therefore, the length of 15 - 20 mm can just meet the above two requirements at the same time. In this embodiment, both the first wire mesh compression cone 7 and the second wire mesh compression cone 8 are compressed from stainless steel wires, so they have good corrosion resistance. The first wire mesh compression cone 7 is arranged in a conical shape and is wider at the top and narrower at the bottom, so that the first wire mesh compression cone 7 can be more easily installed into the free upper end of the heat exchange tube 3. The second wire mesh compression cone 8 is arranged in a conical shape and is narrower at the top and wider at the bottom, so that the second wire mesh compression cone 8 can be more easily installed into the free lower end of the heat exchange tube 3. In this embodiment, the first wire mesh compression cone 7 and the second wire mesh compression cone 8 are arranged in a hollow shape.
[0026] The working principle of the catalyst holding structure in the present utility model is as follows: Since both the first wire mesh compression cone 7 and the second wire mesh compression cone 8 are hollow structures, while the first wire mesh compression cone 7 and the second wire mesh compression cone 8 block the catalyst 6, the heat exchange medium in the heat exchange tube 3 can still smoothly pass through the first wire mesh compression cone 7 and the second wire mesh compression cone 8 for heat exchange.
[0027] In summary, in the catalyst holding structure of the present utility model, compared with the prior art, the entire layer of wire mesh and the grid pressing plate are removed, and instead, a structure in which the wire mesh compression cone is combined with the split pin is used to replace them. After the above structural improvement, not only is the entire catalyst holding structure greatly simplified, reducing the manufacturing cost, but also the catalyst is firmly held in the heat exchange tube section between the first wire mesh compression cone and the second wire mesh compression cone, thus solving the technical problem of easy leakage of the catalyst existing in the prior art.
[0028] The above embodiments are only illustrative of the principles and effects of the present utility model and some applied embodiments, rather than limiting the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.
Claims
1. A catalyst holding structure, comprising: An upper tube sheet, a lower tube sheet and a plurality of heat exchange tubes, the upper free end of the heat exchange tube is welded in the heat exchange tube hole of the upper tube sheet, and the lower free end of the heat exchange tube is welded in the heat exchange tube hole of the lower tube sheet, characterized in that: the upper end surface of the heat exchange tube protrudes 15 to 20 mm from the upper surface of the upper tube sheet, and the part of the heat exchange tube section protruding from the upper surface of the upper tube sheet is provided with a first limiter, the lower end surface of the heat exchange tube protrudes 15 to 20 mm from the lower surface of the lower tube sheet, and the part of the heat exchange tube section protruding from the lower surface of the lower tube sheet is provided with a second limiter, the heat exchange tube is filled with a catalyst, a first wire mesh compression cone is provided between the catalyst and the first limiter, and a second wire mesh compression cone is provided between the catalyst and the second limiter.
2. A catalyst holding structure as claimed in claim 1, characterized in that: The first wire mesh compression cone is formed by compressing stainless steel wire.
3. A catalyst holding structure as claimed in claim 1, characterized in that: The second wire mesh compression cone is formed by compressing stainless steel wire.
4. A catalyst holding structure as claimed in claim 1, characterized in that: The first limiting member is a split pin, and the split pin is radially penetrated in the heat exchange tube.
5. A catalyst holding structure as claimed in claim 1, characterized in that: The second position-limiting member is a split pin, and the split pin is radially inserted into the heat exchange tube.
6. A catalyst holding structure as claimed in claim 1, characterized in that: The first wire mesh compression cone is arranged in a cone shape, and the first wire mesh compression cone is arranged to be wide at the top and narrow at the bottom.
7. A catalyst holding structure as claimed in claim 1, characterized in that: The second wire mesh compression cone is configured to be conical, and the second wire mesh compression cone is configured to be narrow at the top and wide at the bottom.
8. A catalyst holding structure as claimed in claim 1, characterized in that: The first wire mesh compression cone is arranged in a hollow shape.
9. A catalyst holding structure as claimed in claim 1, characterized in that: The second wire mesh compression cone is arranged in a hollow shape.