Tandem pipe reactor with integrated pipe connecting seat

Abstract

The utility model relates to the technical field of petrochemical equipment, in particular to a serial pipe reactor with an integrated pipe connecting seat, which comprises a plurality of straight sleeves, a plurality of bent sleeves, a pipe connecting seat, a connecting hole integrally formed through the pipe connecting seat, a first pipe connecting inner ring, a second pipe connecting inner ring, inner pipes communicated between the straight sleeves and inner elbows of the bent sleeves. And the straight jacket flow channel between the straight sleeves and the bent jacket flow channel of the bent sleeve are communicated through the jacket communicating hole of the pipe connecting seat. The jacket connecting structure is simplified, an existing jacket communicating pipe is omitted, existing inner pipe sealing pair components including a sealing face, a sealing gasket and a fastener are omitted, the structure is simple, the manufacturing cost is reduced, and maintenance is easy. The straight jacket runner and the bent jacket runner are directly communicated through the jacket communicating hole of the connecting pipe seat, so that the situation that the existing external connecting pipe has too many turning corners is avoided, the pressure loss of a fluid medium in the jacket is reduced, the balance of fluid flowing through the jacket is guaranteed, and the energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical equipment, and particularly relates to a string tube reactor with an integrated nozzle seat, which is applicable to large-scale polymerization string tube reactors and prepolymerization reactors. Background Art

[0002] Polypropylene and polyethylene are the varieties with the largest production and consumption in general synthetic resins. There are three production technologies for them, namely slurry polymerization, gas phase polymerization and solution polymerization. The slurry method technology is the main method, which can be divided into two types according to the reactor form, namely stirred tank type and string tube reactor.

[0003] The traditional string tube reactor mainly consists of several straight sleeve pipes, outer elbows, inner elbows, mounting supports and connecting beams, etc., depending on the production capacity. Among them, every two straight pipe cylinders and two elbows form a cycle. Since heat is generated during the polymerization reaction, the reaction heat is taken away by the cooling water in the jacket. A corrugated expansion joint, a mounting support and a beam support seat are arranged on the outer pipe of the straight sleeve pipe. The inner elbow is connected to both ends of the inner pipe of the straight sleeve pipe through a flange to connect the straight sleeve pipes into a whole process. An outer elbow is sleeved outside the inner elbow, so as to form an annular bent jacket flow channel between the two. The jacket of the straight sleeve pipe and the bent jacket flow channel are connected into a whole process through a jacket connecting pipe on the side. The connecting beam is connected to the beam support seat through bolts to form a three-dimensional framework of the straight sleeve pipes. The string tube reactor is supported by multiple bases, that is, each straight sleeve pipe has its own mounting support. Many factors such as the errors of the length, axis position, orientation, elevation, spacing, etc. of the straight sleeve pipes, as well as the parallelism of the straight sleeve pipes, the perpendicularity of the flanges, and the manufacturing errors of the elbows will simultaneously affect the installation and sealing performance of the string tubes. The installation of the string tube reactor can be divided into two types: vertical type and inclined vertical type. The latter occupies a slightly larger area, and its overall structure is more stable than the former.

[0004] For example, such as Figure 1As shown in the figure, a vertically installed tube-string reactor mainly consists of six straight sleeves (R1, R2,......R6), five 180° large elbows (A1, A2, A3, and two bottom elbows), and one 90° elbow connected in sequence to form a circular whole. Through five outer elbows connected to the outer tube at the inner elbows, it is located on a relatively high platform foundation. An axial flow pump is provided at the inner elbow at the bottom of the tube string. The reaction material enters the tube-string reactor from the reaction material inlet 1A, is stirred and circulated in the tube under the drive of the axial flow pump, reacts under the action of the catalyst to form polypropylene in slurry form, and is discharged from the reaction material outlet 1B into the granulation system; the cooling medium enters from the cooling medium inlet of the jacket flow channel and flows out from the cooling medium outlet of the jacket flow channel. Six mounting supports are located at the lower parts of the respective straight sleeves R1, R2, R3, R4, R5, and R6. There are five jacket connecting pipes connecting the jackets to each other. The cooling water in the jacket takes away the heat released by the reaction in the inner tube through the partition wall to maintain the normal operation of the reaction process. In order to coordinate the difference in thermal expansion displacement caused by different temperatures between the inner tube and the outer tube, expansion joints are attached to the jacket; expansion joints, support beam seats, and supports are also attached to the jacket. Adjacent jackets are connected by steel sections to form several space platforms.

[0005] As disclosed in a Chinese patent document with the publication number CN220159984U developed by the applicant before, a tube-string reactor with an integrated sealing structure includes multiple straight sleeves, outer elbows, and inner elbows. Each straight sleeve includes an inner tube and an outer tube, and the inner tube is inserted through the outer tube. The inner elbows are connected in series with the inner tube in sequence to form a medium flow channel for conveying and reacting the reaction material; an annular straight jacket flow channel is formed between the inner tube and the outer tube, and the outer elbows are sleeved outside the inner elbows to form an annular bent jacket flow channel. Sealing structures are respectively provided at the ends of the straight jacket flow channel and the bent jacket flow channel. The straight jacket flow channel and the bent jacket flow channel are connected in series to form a cooling flow channel for conveying the cooling medium; the sealing structure includes a connecting pipe body. One end of the connecting pipe body is welded and fixed to the end of the inner tube / inner elbow, and an outer sealing ring is integrally formed on the outside of this end. The outer sealing ring is welded and fixed to the end of the outer tube / outer elbow. An annular blind groove structure is formed between the root of the outer sealing ring and the connecting pipe body. The blind groove structure seals the port of the straight jacket flow channel / bent jacket flow channel, and a flange structure is integrally extended on the outside of the other end of the connecting pipe body.

[0006] There are further improvements:

[0007] With the shortage of petroleum resources, in order to meet the huge demand and development of the market for special polyolefin materials, new and more stringent requirements have been put forward for the structure, production capacity, and quality of the loop reactor equipment. Chemical enterprises hope to reduce costs and improve the market competitiveness of prices through the scale effect of high production capacity. The overall structure of the tube-string reactor is getting taller and larger in shape and size.

[0008] The first problem is that the traditional jacket connection structure requires drilling holes at the ends of the jacket, fabricating and welding a flange-equipped nozzle as the jacket communication pipe, and then connecting it through a special elbow. This structure is complex, costly, and difficult to maintain. The jacket communication pipe can refer to the jacket communication pipe disclosed in the Chinese patent document with the publication number CN116651377A.

[0009] The second problem is that the external connection structure has many turning corners, resulting in a large pressure loss of the fluid medium inside the jacket, high operating costs of the reactor, and being unfavorable for market competition.

[0010] To quickly adapt to the current market environment with a large demand for high-capacity and large-structure series pipe reactors in new construction and expansion projects in petrochemical industry, and to meet the requirements of capacity increase, energy expansion, and upgrade of traditional series pipe reactors, as well as the demand for high capacity with a polypropylene production capacity of over 600,000 tons per year, developing a new structure of high-capacity series pipe reactors has profound and significant industrial and economic significance. Utility Model Content

[0011] In view of the above technical problems existing in the prior art, the present utility model provides a series pipe reactor with an integrated nozzle seat.

[0012] To achieve the above object, the present utility model provides the following technical solutions:

[0013] Provide a series pipe reactor with an integrated nozzle seat, including multiple straight sleeves and multiple bent sleeves. Each straight sleeve includes an inner pipe and an outer pipe, and the inner pipe is inserted through the outer pipe to form an annular straight jacket flow channel; each bent sleeve includes an outer elbow and an inner elbow, and the outer elbow is sleeved outside the inner elbow to form an annular bent jacket flow channel; its characteristics are:

[0014] The series pipe reactor further includes an integrated nozzle seat, which is provided with a connection hole and a jacket communication hole penetrating through it, and the jacket communication hole is arranged beside the connection hole;

[0015] The nozzle seat is located between the straight sleeve and the bent sleeve. The inner pipe of the straight sleeve and the inner elbow of the bent sleeve are connected through the connection hole, and the straight jacket flow channel of the straight sleeve and the bent jacket flow channel of the bent sleeve are connected through the jacket communication hole; and / or the nozzle seat is located between two straight sleeves, the inner pipes of the two straight sleeves are connected through the connection hole, and the straight jacket flow channels of the two straight sleeves are connected through the jacket communication hole.

[0016] As a further optional solution, first and second nozzle inner rings are integrally extended at the ports corresponding to the connection hole on both sides of the nozzle seat, and the inner walls of the first and second nozzle inner rings are flush with the inner wall of the connection hole.

[0017] As a further optional solution, a first pipe outer ring and a second pipe outer ring are integrally extended from the ports corresponding to the connecting holes on both sides of the pipe seat. The first pipe outer ring is coaxially arranged outside the first pipe inner ring, and the second pipe outer ring is coaxially arranged outside the second pipe inner ring.

[0018] As a further optional scheme, a recessed portion is provided at a position corresponding to the first connecting pipe inner ring and the first connecting pipe outer ring of the connecting pipe seat, and the port of the jacket connecting hole is connected to the recessed portion; and / or a recessed portion is provided at a position corresponding to the second connecting pipe inner ring and the second connecting pipe outer ring of the connecting pipe seat, and the port of the jacket connecting hole is connected to the recessed portion.

[0019] As a further optional solution, each straight sleeve corresponds to an independent connecting socket, and each connecting socket has a connecting hole.

[0020] As a further optional solution, a plurality of straight sleeves share the same connecting socket, and the connecting socket is provided with a plurality of connecting holes, and the connecting holes correspond one-to-one to the straight sleeves and the bent sleeves.

[0021] As a further optional solution, each straight jacket flow channel and curved jacket flow channel corresponds to a plurality of the jacket communicating holes, and the plurality of the jacket communicating holes are evenly distributed around the circumference of the connecting hole.

[0022] As a further optional solution, the radial cross-section of the jacket communicating hole is circular, elliptical, elongated or polygonal.

[0023] As a further optional solution, the jacket communicating hole is a straight hole parallel to the connecting hole, or is an inclined hole.

[0024] As a further optional solution, the connecting pipe seat is an integrally cast or milled structure.

[0025] Beneficial effects of the utility model:

[0026] Compared with the prior art, the utility model discloses a series pipe reactor with an integrated pipe socket. The inner pipe of the straight sleeve and the inner elbow of the curved sleeve are connected through the connecting hole integrally formed by the pipe socket, and the straight jacket flow channel of the straight sleeve and the curved jacket flow channel of the curved sleeve are connected through the jacket connecting hole of the pipe socket. Compared with the prior art:

[0027] (1) The jacket connection structure is simplified, the jacket connecting pipe in the prior art is saved, and the existing inner tube sealing sub-components including the sealing surface, the sealing gasket, and the fasteners are saved. The structure is simple, the manufacturing cost is reduced, and the maintenance is easy.

[0028] (2) The straight jacket flow channel and the curved jacket flow channel are directly connected through the jacket connecting hole of the pipe seat, avoiding the situation where the existing external pipe has too many turns, reducing the pressure loss of the fluid medium in the jacket, ensuring the balance of the fluid flowing through the jacket, and thus reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 FIG. 1 is a schematic structural view of a string tube reactor in the prior art (the jacket connecting pipe is not shown).

[0030] Figure 2 FIG. 2 is a schematic structural view of Embodiment 1 of a string tube reactor with an integrated nozzle seat according to the present invention.

[0031] Figure 3 FIG. 3 is a schematic structural view of Embodiment 2 of a string tube reactor with an integrated nozzle seat according to the present invention, showing that two straight sleeve pipes and two bent sleeve pipes are connected through the nozzle seat.

[0032] REFERENCE NUMERALS

[0033] Straight sleeve pipe 1, inner pipe 11, outer pipe 12, straight jacket flow channel 13;

[0034] Bent sleeve pipe 2, outer elbow 21, inner elbow 22, bent jacket flow channel 23;

[0035] Nozzle seat 3, connection hole 31, first nozzle inner ring 32, second nozzle inner ring 33, first nozzle outer ring 34, second nozzle outer ring 35, recessed portion 36, jacket connection hole 311. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0037] A string tube reactor with an integrated nozzle seat in this embodiment can be understood in combination with the prior art as shown in FIGS. 1 to 3, and mainly includes a plurality of straight sleeve pipes 1 and a plurality of bent sleeve pipes 2. Each straight sleeve pipe 1 includes an inner pipe 11 and an outer pipe 12, and the inner pipe 11 is coaxially disposed in the outer pipe 12 to form an annular straight jacket flow channel 13. Each bent sleeve pipe 2 includes an outer elbow 21 and an inner elbow 22, and the outer elbow 21 is coaxially sleeved outside the inner elbow 22 to form an annular bent jacket flow channel 23. The above is the basic structure of the existing string tube reactor, and this embodiment also has these bases. As an improvement: Figure 1 as shown in Figure 2 The string tube reactor further includes a nozzle seat 3 with an integrated structure made of metal material for connecting between the straight sleeve pipe 1 and the bent sleeve pipe 2, or for connecting between two straight sleeve pipes 1.

[0038] Figure 2 ​Taking the connection between the upper end of the straight sleeve 1 and the end of the bent sleeve 2 as an example, the connection seat 3 is provided with a connection hole 31 running through it. At the ports of the connection hole 31 on both sides of the connection seat 3, a first connection inner ring 32 and a second connection inner ring 33 extend integrally. The inner walls of the first connection inner ring 32 and the second connection inner ring 33 are flush with the inner wall of the connection hole 31. The inner elbow 22 is welded flush to the side wall of the first connection inner ring 32, and the inner pipe 11 is welded flush to the side wall of the second connection inner ring 33. In this way, the inner pipe 11 and the inner elbow 22 are connected through the connection hole 31, and further, the inner pipes 11 of different straight sleeves 1 are connected in series through the inner elbow 22 to form a medium flow path for the transportation and reaction of reaction materials.

[0039] In this embodiment, at the ports of the connection hole 31 on both sides of the connection seat 3, a first connection outer ring 34 and a second connection outer ring 35 also extend integrally. The first connection outer ring 34 is coaxially arranged outside the first connection inner ring 32 and welded to the outer elbow 21, and the second connection outer ring 35 is coaxially arranged outside the second connection inner ring 33 and welded to the inner pipe 11. The connection seat 3 is also provided with a jacket connection hole 311 running through it. The jacket connection hole 311 is arranged in parallel with the connection hole 31. The two ports of the jacket connection hole 311 are respectively connected to the straight jacket flow path 13 and the bent jacket flow path 23. In this way, the straight jacket flow path 13 and the bent jacket flow path 23 are connected through the jacket connection hole 311, and further, the straight jacket flow paths 13 of different straight sleeves 1 are connected in series through the bent jacket flow path 23 to form a cooling flow path for transporting the cooling medium.

[0040] The ends of the first connection inner ring 32 and the second connection inner ring 33 are respectively higher than the first connection outer ring 34 and the second connection outer ring 35. In this case, the height difference between the inner ring and the outer ring provides a certain structural space, which is convenient for the group welding of the first connection inner ring 32 and the inner pipe / inner elbow, or the second connection inner ring 32 and the inner pipe / inner elbow, the heat treatment of the weld, the non-destructive testing of the weld, the repair, and the pressure test for sealing after the inner pipes are connected in series.

[0041] After the weld is detected and tested to be qualified, the first connection outer ring 34 and the outer pipe / outer elbow, or the second connection outer ring 35 and the outer pipe / outer elbow are then welded together in groups.

[0042] In this embodiment, the connection seat 3 is an integral structure, and the connection hole 31, the first connection inner ring 32, the second connection inner ring 33, the first connection outer ring 34, the second connection outer ring 35, and the jacket connection hole 311 are integrally cast or machined by turning and milling on the connection seat 3.

[0043] In this embodiment, each straight sleeve 1 corresponds to an independent connection seat 3, and each connection seat 3 is provided with a connection hole 31. The connection seat 3 is generally cylindrical. The outer wall of the connection seat 3 is provided with a concave part, which is convenient for positioning and welding the pipe body.

[0044] Another embodiment is as follows Figure 3As shown, several straight sleeves 1 or all straight sleeves 1 share the same connection seat 3. The connection seat 3 is provided with a plurality of connection holes 31, and the connection holes 31 correspond to the straight sleeves 1 and the bent sleeves 2 one by one. In this way, the connection seat 3 also serves as the support for multiple straight sleeves 1, and no additional support needs to be provided.

[0045] In practice, there is one jacket communication hole 311 between each straight jacket flow channel 13 and the bent jacket flow channel 23, or each straight jacket flow channel 13 and the bent jacket flow channel 23 correspond to a plurality of the jacket communication holes 311, and the plurality of jacket communication holes 311 are evenly distributed around the circumferential side of the connection hole 31. Optionally, the radial cross-section of the jacket communication hole 311 is circular, elliptical, strip-shaped or polygonal.

[0046] In the above embodiments, a recess 36 is provided at the position between the corresponding first connection inner ring 32 and the first connection outer ring 34 of the connection seat 3, and the port of the jacket communication hole 311 is connected to the recess 36; and / or a recess 36 is provided at the position between the corresponding second connection inner ring 33 and the second connection outer ring 35 of the connection seat 3, and the port of the jacket communication hole 311 is connected to the recess 36. This facilitates the impurities at the bottom of the straight jacket flow channel 13 and the bent jacket flow channel 23 to flow away through the jacket communication hole 311, avoiding deposition.

[0047] In this embodiment, the jacket communication hole 311 is a straight hole parallel to the connection hole 31. In practice, it can be changed to or be a straight hole or a spiral hole inclined with respect to the axis of the connection hole 31.

[0048] In the description of the present invention, it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. The components of the embodiments of the present invention usually described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0049] Therefore, the above detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention claimed, but only represents the selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0050] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "set", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

Claims

1. A series of pipe reactors with an integrated pipe socket, comprising a plurality of straight sleeves and a plurality of curved sleeves, each straight sleeve comprising an inner tube and an outer tube, the inner tube being inserted into the outer tube to form an annular straight jacket flow channel; each curved sleeve comprising an outer elbow and an inner elbow, the outer elbow being sleeved outside the inner elbow to form an annular curved jacket flow channel; wherein: The series pipe reactor also includes a connecting pipe seat of an integrated structure, the connecting pipe seat is penetrated by a connecting hole and a jacket communicating hole, and the jacket communicating hole is arranged beside the connecting hole; The connecting pipe seat is located between the straight sleeve and the bent sleeve, the inner tube of the straight sleeve and the inner elbow of the bent sleeve are connected via the connecting hole, and the straight jacket flow channel of the straight sleeve and the bent jacket flow channel of the bent sleeve are connected via the jacket connecting hole; and / or the connecting pipe seat is located between two straight sleeves, the inner tubes of the two straight sleeves are connected via the connecting hole, and the straight jacket flow channels of the two straight sleeves are connected via the jacket connecting hole.

2. The series pipe reactor with an integrated pipe socket according to claim 1, characterized in that: A first pipe inner ring and a second pipe inner ring are integrally extended from the ports of the connecting hole corresponding to the two sides of the pipe seat, and the inner walls of the first pipe inner ring and the second pipe inner ring are flush with the inner wall of the connecting hole.

3. A series of pipe reactors with an integrated pipe connection socket according to claim 2, characterized in that A first pipe outer ring and a second pipe outer ring are integrally extended from the ports corresponding to the connecting holes on both sides of the pipe seat. The first pipe outer ring is coaxially arranged outside the first pipe inner ring, and the second pipe outer ring is coaxially arranged outside the second pipe inner ring.

4. The series pipe reactor with an integrated pipe connection socket according to claim 3, characterized in that: A recessed portion is provided between the first connecting pipe inner ring and the first connecting pipe outer ring of the connecting pipe seat, and the port of the jacket communicating hole is connected to the recessed portion and / or a recessed portion is provided between the second connecting pipe inner ring and the second connecting pipe outer ring of the connecting pipe seat, and the port of the jacket communicating hole is connected to the recessed portion.

5. The series pipe reactor with an integrated pipe socket according to claim 1, characterized in that Each straight sleeve corresponds to an independent connecting socket, and each connecting socket has a connecting hole.

6. The series pipe reactor with an integrated pipe socket according to claim 1, characterized in that A plurality of straight sleeves share the same connecting socket, and the connecting socket is provided with a plurality of connecting holes, and the connecting holes correspond to the straight sleeves and the bent sleeves one by one.

7. The series pipe reactor with an integrated pipe socket according to claim 1, characterized in that: Each straight jacket flow channel and curved jacket flow channel corresponds to a plurality of the jacket communicating holes, and the plurality of the jacket communicating holes are evenly distributed around the peripheral side of the connecting hole.

8. The series pipe reactor with an integrated pipe socket according to claim 1, characterized in that: The radial cross section of the jacket communicating hole is circular, elliptical, long strip or polygonal.

9. The series pipe reactor with an integrated pipe socket according to claim 1, characterized in that: The jacket communicating hole is a straight hole parallel to the connecting hole, or an inclined hole.

10. The series pipe reactor with an integrated pipe socket according to claim 1, characterized in that: The connecting pipe seat is an integral casting or milling structure.

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