A reforming catalyst pipe connection structure and a reforming catalyst pipe

Abstract

The utility model provides a kind of reform catalyst pipeline connection structure and reform catalyst pipeline, it is related to reform catalyst pipeline connection technical field, comprising: concave pipe, convex pipe and sleeve, one end of concave pipe is used to connect with reform catalyst pipeline, the inner periphery of the other end of concave pipe is provided with recessed part, one end of convex pipe is used to connect with reform catalyst pipeline, the inner periphery of the other end of convex pipe is provided with protruding part, protruding part is inserted with recessed part, sleeve is sleeved in the outside of concave pipe and convex pipe, and the both ends of sleeve are connected with concave pipe and convex pipe respectively;The problem of high cost of part of reform catalyst sleeve connector, poor quality of part of reform catalyst sleeve connector in prior art is solved.

Description

Technical Field

[0001] This utility model belongs to the field of reforming catalyst pipeline connection technology, and more specifically, relates to a reforming catalyst pipeline connection structure and a reforming catalyst pipeline. Background Technology

[0002] Catalytic reforming units are crucial secondary processing units in oil refining and petrochemical production. They not only produce clean, high-octane gasoline components but also generate chemical feedstocks such as benzene, toluene, and xylene, and provide inexpensive hydrogen resources. my country's reforming capacity has been increasing year by year, playing an increasingly important role in the petrochemical industry. Continuous reforming catalyst lifting utilizes pneumatic conveying technology, leveraging the high-speed flow of hydrogen (or nitrogen) in the riser to transport the solid catalyst. This creates a gas-solid two-phase flow within the riser, resulting in a complex fluid flow pattern. During normal operation, this causes erosion and abrasion on the inner wall of the riser. This not only leads to costly catalyst loss, affecting the unit's economics, but can also cause severe wear on the catalyst pipeline, resulting in riser perforation and compromising the unit's safety.

[0003] Due to the unique characteristics of reforming catalyst risers, a high degree of smoothness of the inner wall is required during construction to minimize erosion by the gas-solid fluid. Welds at pipeline connections must be rigorously ground smooth, and strict inspections of pipeline joints are necessary during construction to maximize construction standards and reduce erosion and wear caused by rough interfaces. However, traditional imported catalyst sleeve connectors are extremely expensive and require very high manufacturing precision, making domestic production difficult. Furthermore, the sleeve connectors from the French Institute of Petroleum and New Energy (IFP) have gaps between the sleeve and the main pipe, making on-site welding difficult and prone to misalignment, resulting in protrusions on the inner surface of the pipeline and increased catalyst wear. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of the existing technology by providing a reforming catalyst pipeline connection structure and a reforming catalyst pipeline, thereby solving the problems of high cost and poor quality of some reforming catalyst sleeve connectors in the existing technology.

[0005] To achieve the above objectives, this utility model provides a reforming catalyst pipeline connection structure, comprising: The device comprises a concave tube, a convex tube, and a sleeve. One end of the concave tube is used to connect to a reforming catalyst pipeline, and the other end of the concave tube has a recessed portion on its inner circumference. One end of the convex tube is used to connect to a reforming catalyst pipeline, and the other end of the convex tube has a protruding portion on its inner circumference. The protruding portion is inserted into the recessed portion. The sleeve is fitted over the outside of the concave tube and the convex tube, and both ends of the sleeve are connected to the concave tube and the convex tube, respectively.

[0006] Optionally, both the recessed portion and the protruding portion are annular structures.

[0007] Optionally, the length of the protrusion is greater than the length of the recess.

[0008] Optionally, one end of the concave tube and one end of the convex tube are respectively welded to a section of reforming catalyst pipeline.

[0009] Optionally, one end of the concave tube and one end of the convex tube are respectively provided with a welding bevel structure.

[0010] Optionally, the material and wall thickness of the concave tube and the convex tube are the same as those of the reforming catalyst pipeline.

[0011] Optionally, the two ends of the sleeve are welded to the concave tube and the convex tube respectively, and the height of the weld leg is equal to the wall thickness of the sleeve.

[0012] Optionally, the connection between the concave tube and the convex tube is located in the middle of the sleeve.

[0013] Optionally, the reforming catalyst connecting structure is made of low-alloy heat-resistant steel.

[0014] The present invention also provides a reforming catalyst pipeline, including the reforming catalyst pipeline connection structure described above.

[0015] This utility model provides a reforming catalyst pipeline connection structure and a reforming catalyst pipeline. Its advantages are as follows: The reforming catalyst pipeline connection structure connects to the reforming catalyst pipeline to be connected via concave and convex tubes. For the connection points, grinding is easy because the concave and convex tubes can be ground before connection. The insertion and mating of the concave part of the concave tube and the convex part of the convex tube facilitates coaxial docking, reducing docking difficulty and improving docking accuracy. The concave and convex tubes are connected by sleeves fitted on their outer sides. Since this connection point is exposed, grinding is also easy. The overall structure of this reforming catalyst pipeline connection structure is simple, low-cost, and ensures connection quality, facilitating construction and grinding.

[0016] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0018] Figure 1 A three-dimensional exploded view of a reforming catalyst pipeline connection structure according to an embodiment of the present invention is shown.

[0019] Figure 2 An exploded cross-sectional view of a reforming catalyst pipeline connection structure according to an embodiment of the present invention is shown.

[0020] Figure 3 A schematic diagram of the overall structure of a reforming catalyst pipeline according to an embodiment of the present invention is shown.

[0021] Figure 4 A partial structural schematic diagram of a reforming catalyst pipeline according to an embodiment of the present invention is shown.

[0022] Figure 5 A partial structural schematic diagram of a reforming catalyst pipeline according to an embodiment of the present invention is shown.

[0023] Figure 6 A schematic diagram of the assembly structure of a reforming catalyst pipeline according to an embodiment of the present invention is shown.

[0024] Explanation of reference numerals in the attached figures: 1. Concave tube; 2. Convex tube; 3. Sleeve; 4. Reforming catalyst pipeline; 5. Recessed part; 6. Raised part; 7. Welded bevel structure. Detailed Implementation

[0025] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0026] like Figure 1 As shown, this utility model provides a reforming catalyst pipeline connection structure, including: The concave tube 1, the convex tube 2, and the sleeve 3 are provided. One end of the concave tube 1 is used to connect to the reforming catalyst pipeline 4, and the other end of the concave tube 1 is provided with a recessed part 5 on its inner circumference. One end of the convex tube 2 is used to connect to the reforming catalyst pipeline 4, and the other end of the convex tube 2 is provided with a protruding part 6 on its inner circumference. The protruding part 6 is inserted into the recessed part 5. The sleeve 3 is sleeved on the outside of the concave tube 1 and the convex tube 2, and both ends of the sleeve 3 are connected to the concave tube 1 and the convex tube 2 respectively.

[0027] Specifically, to address the issues of high cost and poor quality of some reforming catalyst sleeve 3 connectors in existing technologies, the reforming catalyst pipeline 4 connection structure provided by this utility model connects to the reforming catalyst pipeline 4 to be connected via a concave tube 1 and a convex tube 2. For this connection point, grinding is less difficult because the concave tube 1 and convex tube 2 can be performed before connection. The concave part 5 of the concave tube 1 and the protruding part 6 of the convex tube 2 can be easily inserted to achieve coaxial connection, reducing connection difficulty and improving connection accuracy. The concave tube 1 and convex tube 2 are connected by a sleeve 3 fitted on their outer sides. Since this connection point is exposed, grinding is also less difficult. This reforming catalyst pipeline 4 connection structure is simple in overall structure, low in cost, and ensures connection quality, facilitating construction and grinding.

[0028] In this embodiment, both the recessed portion 5 and the protruding portion 6 are annular structures.

[0029] Specifically, such as Figure 2 As shown, the annular protrusion 6 can be inserted into the annular groove to achieve the connection between the concave tube 1 and the convex tube 2.

[0030] In this embodiment, the length of the protrusion 6 is greater than the length of the recess 5.

[0031] Specifically, the protrusion is slightly longer than the recess, which can improve the error tolerance of on-site installation and ensure a tight connection of the inner wall of the pipe.

[0032] In this embodiment, the length of the protrusion 6 is 5 mm, and the length of the recess 5 is 4.5 mm.

[0033] In this embodiment, one end of the concave tube 1 and one end of the convex tube 2 are respectively welded to a section of reforming catalyst pipeline 4.

[0034] Specifically, after the concave tube 1 and the convex tube 2 are welded to a section of reforming catalyst pipeline 4, the weld can be ground by extending into the concave part 5 of the concave tube 1 or the convex part 6 of the convex tube 2. The grinding is convenient.

[0035] In this embodiment, a welding bevel structure 7 is provided at one end of the concave tube 1 and one end of the convex tube 2.

[0036] Specifically, the welding bevel structure 7 is located on the outer ring, which can form a V-shaped bevel butt joint when welding with the reforming catalyst pipeline 4, so as to facilitate welding.

[0037] In this embodiment, the materials and wall thicknesses of the concave tube 1 and the convex tube 2 are the same as those of the reforming catalyst pipeline 4.

[0038] Specifically, using the same material and wall thickness facilitates welding and ensures welding quality.

[0039] In this embodiment, the lengths of the concave tube 1 and the convex tube 2 are related to the diameter of the reforming catalyst pipeline 4, which facilitates grinding of the welded parts by going deep into the concave tube 1 or the convex tube 2.

[0040] In this embodiment, the dimensions of the reforming catalyst pipeline 4 connection structure of a certain wall thickness type are shown in Table 1 below.

[0041] Table 1

[0042] In another embodiment, the dimensions of the reforming catalyst pipe 4 connection structure of another wall thickness type are shown in Table 2 below.

[0043] Table 2

[0044] In this embodiment, the two ends of the sleeve 3 are welded to the concave tube 1 and the convex tube 2 respectively, and the height of the weld leg is equal to the wall thickness of the sleeve 3.

[0045] Specifically, the welds between the concave tube 1, the convex tube 2 and the reforming catalyst pipeline 4, and the welds between the sleeve 3 and the concave tube 1 and the convex tube 2 are all heat-treated welds, that is, the welds are heat-treated after welding.

[0046] In this embodiment, the connection between the concave tube 1 and the convex tube 2 is located in the middle of the sleeve 3.

[0047] Specifically, during the welding of sleeve 3, the center of sleeve 3 is placed at the joint between concave tube 1 and convex tube 2.

[0048] In this embodiment, the reforming catalyst connecting structure is made of low-alloy heat-resistant steel.

[0049] Specifically, the reforming catalyst pipeline 4, sleeve 3, concave pipe 1, and convex pipe 2 are made of ASTM A335 P11 material, which is suitable for reforming catalyst pipeline 4 with a pipe diameter of DN50~150, a design temperature of less than or equal to 565℃, and a design pressure of less than or equal to 0.81MPa.

[0050] like Figure 3 As shown, the present invention also provides a reforming catalyst pipeline 4, including the above-described reforming catalyst pipeline 4 connection structure.

[0051] Specifically, the reforming catalyst pipelines 4 of different sections are connected by the aforementioned reforming catalyst pipeline 4 connection structure, which is simple to operate, low in cost, and can ensure connection quality, and facilitates construction and grinding.

[0052] In summary, when welding the reforming catalyst pipeline 4 provided by this invention, the concave tube 1 and the convex tube 2 are first welded to a section of the reforming catalyst pipeline 4 respectively, forming a structure as shown in the figure. Figure 4 and Figure 5 The partial structure shown requires that before welding the concave tube 1 and convex tube 2 to each section of the reforming catalyst pipeline 4, all dust, grease, or other contaminants be removed. After welding, heat treatment is performed, and the weld seam on the inner side of the tube must be ground smooth and flat, without any burrs. Then, the sleeve 3 is fitted onto the outside of the concave tube 1 or convex tube 2, forming a structure as shown. Figure 6 The assembly structure shown is then assembled by connecting the concave tube 1 and the convex tube 2. After that, the sleeve 3 is moved so that its center is placed at the joint of the concave tube 1 and the convex tube 2. The two ends of the sleeve 3 are then welded to the outer walls of the concave tube 1 and the convex tube 2. The weld height C is equal to the wall thickness of the sleeve 3. The weld seam needs to be heat-treated after welding.

[0053] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A reforming catalyst pipeline connection structure, characterized in that, include: The device comprises a concave tube, a convex tube, and a sleeve. One end of the concave tube is used to connect to a reforming catalyst pipeline, and the other end of the concave tube has a recessed portion on its inner circumference. One end of the convex tube is used to connect to a reforming catalyst pipeline, and the other end of the convex tube has a protruding portion on its inner circumference. The protruding portion is inserted into the recessed portion. The sleeve is fitted over the outside of the concave tube and the convex tube, and both ends of the sleeve are connected to the concave tube and the convex tube, respectively.

2. The reforming catalyst pipeline connection structure according to claim 1, characterized in that, Both the recessed portion and the protruding portion are annular structures.

3. The reforming catalyst pipeline connection structure according to claim 1, characterized in that, The length of the protrusion is greater than the length of the recess.

4. The reforming catalyst pipeline connection structure according to claim 1, characterized in that, One end of the concave tube and one end of the convex tube are respectively welded to a section of reforming catalyst pipeline.

5. The reforming catalyst pipeline connection structure according to claim 4, characterized in that, One end of the concave tube and one end of the convex tube are respectively provided with a welding bevel structure.

6. The reforming catalyst pipeline connection structure according to claim 1, characterized in that, The concave tube and the convex tube are made of the same material and have the same wall thickness as the reforming catalyst pipeline.

7. The reforming catalyst pipeline connection structure according to claim 1, characterized in that, The two ends of the sleeve are welded to the concave tube and the convex tube respectively, and the height of the weld leg is equal to the wall thickness of the sleeve.

8. The reforming catalyst pipeline connection structure according to claim 1, characterized in that, The connection between the concave tube and the convex tube is located in the middle of the sleeve.

9. The reforming catalyst pipeline connection structure according to claim 1, characterized in that, The reforming catalyst connecting structure is made of low-alloy heat-resistant steel.

10. A reforming catalyst conduit, characterized in that, Includes the reforming catalyst pipeline connection structure as described in any one of claims 1-9.

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