Screening and blocking device for catalyst running of central cylinder of reforming reactor

Abstract

The utility model discloses a screening and blocking device for a catalyst running from a central cylinder of a reforming reactor, which relates to the technical field of reforming reactors and is characterized in that a protective cover which covers the upper part of a balance hole and is used for screening and blocking the reforming catalyst is detachably mounted at the upper part of the balance hole; the inner diameter of the cylinder is larger than the aperture of the balance hole, the upper end and the lower end of the cylinder are of an open structure, the cylinder is arranged on the upper portion of the balance hole and is coaxial with the balance hole, an expanding step is arranged on the inner wall of the upper side of the cylinder, and a sieve plate used for blocking the reforming catalyst is horizontally clamped on the expanding step; under the condition that the normal action of the balance hole in the top of the reactor center cylinder is kept unchanged, a reforming catalyst can be effectively prevented from abnormally entering the reactor center cylinder, the long-period operation of a reforming device is ensured, the phenomenon that the reactor is forced to be shut down and overhauled for a long time due to pressure drop rise is avoided, and the enterprise benefit is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of reforming reactors, in particular to a screening and blocking device for catalyst running in a central tube of a reforming reactor. Background Art

[0002] The catalytic reforming reaction in the reforming reactor is mainly carried out under the conditions of 0.3-0.6MPa, 480-540℃ and the action of the catalyst, through dehydrogenation, isomerization and cracking reactions, to convert the raw naphtha (C6-C 11 The process of rearranging the hydrocarbon molecules of the raw materials (components) to convert the cycloalkanes and alkanes into aromatics or isoalkanes, and producing some hydrogen as a by-product. For the common continuous reforming units in China, most of them are composed of multiple reforming reactors used in series. During the catalytic reforming reaction, the reforming catalyst moves slowly downward between the fan-shaped cylinder (outer sleeve) and the center cylinder (inner sleeve) by gravity, and is finally transported to the catalyst regeneration system to restore its activity and then returns to the reforming reactor, forming a catalyst closed circulation system.

[0003] During the production process, during the fluid circulation process through the upper balance holes of the reforming reactors in multiple continuous reforming units, reforming catalysts are often mixed into the fluids. These fluids containing the reforming catalysts enter the central cylinder of the next reforming reactor, and are carried by high-speed reaction materials into the intermediate heating furnace of the reforming reactor, where they are broken into pieces and then enter the fan-shaped cylinder of the next reforming reactor, causing the fan-shaped cylinder of the next reforming reactor to be blocked, resulting in an increase in the pressure drop of the next reactor, which is forced to shut down for a long time for maintenance, and the company's efficiency is greatly reduced.

[0004] In order to prevent the reforming catalyst from escaping, the existing method is to weld a hood on the balancing hole on the top of the reactor center tube. The hood can ensure the passage of airflow, but the reforming catalyst cannot pass through. However, the sieve holes of the hood are easily clogged during long-term use, resulting in the inability to discharge the fluid, affecting the fluid circulation of the reforming reactor. In addition, the hood is welded and fixed and cannot be disassembled, resulting in very time-consuming and labor-intensive cleaning of the sieve holes, which is very inconvenient. Utility Model Content

[0005] In order to overcome the shortcomings in the background technology, the utility model discloses a screening and blocking device for catalyst running in the central tube of a reforming reactor. The utility model can effectively prevent the reforming catalyst from abnormally entering the central tube of the reactor while maintaining the normal function of the balance hole at the top of the central tube of the reactor, thereby ensuring the long-term operation of the reforming device, avoiding the reactor pressure drop from being increased and being forced to shut down for long-term maintenance, and increasing the benefits of the enterprise.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A protective device capable of preventing catalyst from escaping from a central cylinder of a reforming reactor comprises a reforming reactor and a balancing hole arranged at an upper portion of the reforming reactor, a protective cover covering the upper portion of the balancing hole and used for screening and blocking the reforming catalyst being detachably mounted on the upper portion of the balancing hole, the protective cover comprising a cylinder body with an inner diameter larger than the aperture of the balancing hole and an open structure at both upper and lower ends, the cylinder body being arranged at an upper portion of the balancing hole and being coaxially arranged with the balancing hole, a diameter expansion step being arranged on an inner wall on an upper side of the cylinder body, a sieve plate for blocking the reforming catalyst being horizontally clamped on the diameter expansion step, an upper cover covering the open upper end of the cylinder body being detachably mounted on the upper portion of the cylinder body, a surface of the upper cover being provided with a plurality of upper through holes for fluid circulation.

[0008] Furthermore, a limiting rib which surrounds the balancing hole and has a U-shaped structure is provided on the outside of the balancing hole, an outer extension edge which matches the inner diameter of the limiting rib is provided on the lower edge of the outer wall of the cylinder, and an inner folding edge which is pressed and limited with the outer extension edge is provided on the upper edge of the limiting rib.

[0009] Furthermore, a plurality of mounting holes are evenly distributed on the upper surface of the inner folded edge, and a plurality of limiting holes corresponding to the plurality of mounting holes are provided on the upper surface of the outer extended edge. Fastening bolts are installed through the inner threads of the corresponding mounting holes and the limiting holes.

[0010] Furthermore, a plurality of side through holes for fluid circulation are evenly distributed on the side wall of the cylinder below the sieve plate, and an annular screen is provided on the lower surface of the sieve plate to prevent the reforming catalyst from escaping from the side through holes.

[0011] Furthermore, the annular screen is interference fit with the inner wall of the cylinder.

[0012] Furthermore, an annular pressing plate for pressing and limiting the sieve plate is provided on the lower surface of the upper cover.

[0013] Furthermore, an outer wall of the upper end of the cylinder is provided with an external thread, and an inner wall of the upper cover is provided with an internal thread matching the external thread.

[0014] Compared with the prior art, the utility model has the following beneficial effects: by setting a protective cover, the catalyst in the fluid running out of the balance hole can be screened and filtered, effectively preventing the catalyst from running out into the next reforming reactor and causing the fan-shaped cylinder to be blocked;

[0015] By setting the clamping screen plate, the staff can disassemble and replace the screen plate, which provides great convenience for daily cleaning and replacement;

[0016] The detachable upper cover and through hole not only provide convenience for the staff to replace and clean the sieve plate, but also protect the sieve plate to prevent external foreign objects from directly damaging or covering the sieve plate, affecting the subsequent catalyst isolation and fluid circulation;

[0017] By setting the side through holes and the annular screen, not only the fluid circulation effect of the protective cover can be effectively improved, but also the catalyst can be prevented from running out;

[0018] By providing a detachable cylinder, it is convenient for the staff to disassemble and clean the cylinder;

[0019] The utility model can not only screen and filter the fluid running out of the balance hole, effectively preventing the catalyst from running out and causing blockage in the reforming reactor in the subsequent next process, but also greatly facilitates the daily disassembly, cleaning and maintenance of the staff; the utility model has a simple structure and is easy to install and use. While keeping the balance hole on the top of the central tube of the reactor functioning normally, it can effectively prevent the reforming catalyst from abnormally entering the central tube of the reactor, thereby ensuring the long-term operation of the reforming device, avoiding the reactor pressure drop from being increased and being forced to shut down for a long time for maintenance, and increasing the benefits of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the balancing hole structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the protective cover structure of the utility model;

[0023] Figure 4 It is a schematic diagram of the cylinder structure of the utility model;

[0024] Figure 5 This is a schematic diagram of the screen structure of the utility model;

[0025] Figure 6 It is a schematic diagram of the upper cover structure of the utility model.

[0026] In the figure: 1. reforming reactor; 2. balancing hole; 3. protective cover; 4. inner folding edge; 5. mounting hole; 6. limiting retaining edge; 7. upper cover; 8. upper through hole; 9. sieve plate; 10. cylinder; 11. outer extension edge; 12. external thread; 13. diameter expansion step; 14. side through hole; 15. limiting hole; 16. annular screen; 17. internal thread; 18. annular pressure plate. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present invention and are for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction.

[0028] Please refer to the instruction manual Figure 1-6 , the utility model provides a technical solution:

[0029] Embodiment 1, a screening and blocking device for catalyst running in the central cylinder of a reforming reactor, comprises a reforming reactor 1, and a balancing hole 2 arranged on the upper part of the reforming reactor 1, a protective cover 3 covering the upper part of the balancing hole 2 and used for screening and blocking the catalyst is arranged on the upper part of the balancing hole 2, the protective cover 3 comprises a cylinder 10 with an inner diameter larger than the aperture of the balancing hole 2 and an open structure at both upper and lower ends, the cylinder 10 is arranged on the upper part of the balancing hole 2 and is coaxially arranged with the balancing hole 2, an annular expansion step 13 is arranged on the upper inner wall of the cylinder 10, a sieve plate 9 for blocking the reforming catalyst is horizontally clamped on the expansion step 13, the fluid discharged from the reforming reactor through the balancing hole 2 is filtered by the sieve plate 9, so that the reforming catalyst in the fluid is screened and blocked, which can effectively prevent the reforming catalyst from running out, and in order to prevent external foreign matter from damaging or clogging the sieve plate 9, an upper cover 7 covering the open upper end of the cylinder 10 is arranged on the upper part of the cylinder 10, and a plurality of upper through holes 8 for fluid circulation are arranged on the surface of the upper cover 7.

[0030] Embodiment 2: After the reforming reactor is used for a long time, the reforming catalyst separated and blocked by the sieve plate 9 will adhere to the sieve plate 9, thereby causing the sieve holes on the sieve plate 9 to be blocked, affecting the subsequent circulation of the fluid. In order to facilitate the staff to clean the sieve plate 9, the outer wall of the upper end of the cylinder 10 is provided with an external thread 12, and the inner wall of the upper cover 7 is provided with an internal thread 17 adapted to the external thread 12. The upper cover 7 threadedly connected to the cylinder 10 can be easily and conveniently removed, so that the sieve plate 9 in the cylinder 10 can be taken out for cleaning;

[0031] In order to ensure that the sieve plate 9 can be firmly and stably placed on the expansion step 13 and provide strong support for the subsequent screening partition of the reforming catalyst, the lower surface of the upper cover 7 is provided with an annular pressure plate 18 for pressing and limiting the sieve plate 9. The inner diameter of the annular pressure plate 18 is adapted to the inner diameter of the expansion step 13 of the annular structure, and the plate thickness of the annular pressure plate 18 should be adapted to the width of the expansion step 13.

[0032] Embodiment 3: After the reforming reactor is used for a long time, a large amount of reforming catalyst or other particles separated by the sieve plate 9 will adhere to the inner wall of the cylinder 10. In order to facilitate the cleaning of the inner wall of the cylinder 10, a limiting rib 6 is provided on the outer side of the balancing hole 2 and surrounds the balancing hole 2, and has a U-shaped structure. The lower edge of the outer wall of the cylinder 10 is provided with an extension edge 11 that is compatible with the inner diameter of the limiting rib 6. The upper edge of the limiting rib 6 is provided with an inner folding edge 4 that is pressed and limited with the extension edge 11. In order to ensure that the cylinder 10 is installed firmly and stably, a plurality of mounting holes 5 are evenly distributed on the upper surface of the inner folding edge 4. A plurality of limiting holes 15 corresponding to the plurality of mounting holes 5 are provided on the upper surface of the extension edge 11. The corresponding mounting holes 5 and the inner threads of the limiting holes 15 are provided with fastening bolts.

[0033] Embodiment 4. During the fluid discharge circulation process of the reforming reactor, since the reforming catalyst in the fluid needs to be screened and blocked, the aperture of the sieve holes on the sieve plate 9 must be smaller than the diameter of the reforming catalyst particles. In addition, the reforming catalyst accumulated at the bottom of the sieve plate 9 will inevitably affect the circulation discharge of other fluids. In order to ensure the normal circulation discharge of the fluid, a number of side through holes 14 for fluid circulation are evenly distributed on the side wall of the cylinder 10 at the lower part of the sieve plate 9. The lower surface of the sieve plate 9 is provided with an annular screen 16 to prevent the catalyst from escaping from the side through holes 14. The annular screen 16 is interference fit with the inner wall of the cylinder 10.

[0034] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the above-mentioned embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the content of the claims involved.

Claims

1. A screen partition device for catalyst running in the central cylinder of a reforming reactor, comprising a reforming reactor (1) and a balancing hole (2) arranged on the upper part of the reforming reactor (1), characterized in that: A protective cover (3) covering the upper part of the balancing hole (2) and used for screening and blocking the reforming catalyst is detachably mounted on the upper part of the balancing hole (2). The protective cover (3) comprises a cylinder (10) having an inner diameter greater than the diameter of the balancing hole (2) and having open structures at both ends. The cylinder (10) is arranged on the upper part of the balancing hole (2) and is coaxially arranged with the balancing hole (2). An expansion step (13) is provided on the inner wall of the upper side of the cylinder (10). A sieve plate (9) for blocking the reforming catalyst is horizontally clamped on the expansion step (13). An upper cover (7) covering the open upper end of the cylinder (10) is detachably mounted on the upper part of the cylinder (10). A plurality of upper through holes (8) for fluid circulation are provided on the surface of the upper cover (7).

2. A screen and baffle device for catalyst running in the central tube of a reforming reactor according to claim 1, characterized in that: A limiting rib (6) which surrounds the balancing hole (2) and has a U-shaped structure is provided on the outside of the balancing hole (2); an outer extension rib (11) which matches the inner diameter of the limiting rib (6) is provided on the lower edge of the outer wall of the cylinder (10); and an inner folding rib (4) which is pressed and limited with the outer extension rib (11) is provided on the upper edge of the limiting rib (6).

3. A screen and baffle device for catalyst running in the central tube of a reforming reactor according to claim 2, characterized in that: The upper surface of the inner folded edge (4) is evenly distributed with a plurality of mounting holes (5), and the upper surface of the outer extended edge (11) is provided with a plurality of limiting holes (15) corresponding to the plurality of mounting holes (5) one by one, and the corresponding mounting holes (5) and the limiting holes (15) are internally threaded with fastening bolts.

4. A screen and baffle device for catalyst running in the central tube of a reforming reactor according to claim 1, characterized in that: A plurality of side through holes (14) for fluid circulation are evenly distributed on the side wall of the cylinder (10) below the sieve plate (9), and an annular screen (16) is provided on the lower surface of the sieve plate (9) to prevent the reforming catalyst from escaping from the side through holes (14).

5. A screen and baffle device for catalyst running in the central tube of a reforming reactor according to claim 4, characterized in that: The annular screen (16) is interference fit with the inner wall of the cylinder (10).

6. A screen and baffle device for catalyst running in the central tube of a reforming reactor according to claim 1, characterized in that: The lower surface of the upper cover (7) is provided with an annular pressing plate (18) for pressing and limiting the position of the sieve plate (9).

7. A screen and baffle device for catalyst running in the central tube of a reforming reactor according to claim 6, characterized in that: An outer wall at the upper end of the cylinder (10) is provided with an external thread (12), and an inner wall of the upper cover (7) is provided with an internal thread (17) matching the external thread (12).

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