Tandem pipe reactor with jacket sealing ring discharge outlet

Abstract

The utility model relates to the technical field of petrochemical equipment, in particular to a serial pipe reactor with a jacket sealing ring discharge port, which comprises a plurality of straight sleeves and a plurality of bent pipes, each straight sleeve comprises an inner pipe and an outer pipe, and the inner pipe is arranged in the outer pipe in a penetrating manner to form an annular straight jacket runner; annular sealing plates are arranged at the two ends of the straight clamping sleeve flow channel, discharging hole channels are formed in the annular sealing plates, inner end openings of the discharging hole channels are communicated with the straight clamping sleeve flow channel, outer end openings of the discharging hole channels extend to the transverse outer end faces of the annular sealing plates, hole blocking plugs are detachably arranged at outer end openings of the annular sealing plates, and therefore the discharging hole channels are in a normally-closed state. Compared with the prior art, on one hand, the normally-closed discharge hole channel is arranged, so that deposited dirt in the jacket can be conveniently cleaned and discharged; and on the other hand, the hole blocking plug for blocking the discharge hole channel is located on the transverse outer end face of the annular sealing plate, the structure is simple and compact, manual operation is easy, assembly, disassembly and maintenance are convenient, and the maintenance cost 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 a jacket seal ring discharge port, which is applicable to large-scale polymerization string tube reactors and prepolymerization reactors. Background Technique

[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 sleeves, outer elbows, inner elbows, installation supports and connecting beams, etc. according to the production capacity. Among them, every two straight tube 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, an installation support and a support beam seat are arranged on the outer tube of the straight sleeve. The inner elbow is connected to both ends of the inner tube of the straight sleeve through a flange to connect the straight sleeves 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 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 support beam seat through bolts to combine the straight sleeves into a three-dimensional framework. The string tube reactor is supported by multiple bases, that is, each straight sleeve has its own installation support. Many factors such as the errors of the length, axis position, orientation, elevation, spacing, etc. of the straight sleeve, as well as the parallelism of the straight sleeve, the perpendicularity of the flange, and the manufacturing errors of the elbow will simultaneously affect the installation and sealing performance of the string tube. 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 pipe string reactor is mainly formed by sequentially connecting six straight sleeves (R1, R2,......R6), five 180° large elbows (A1, A2, A3, and two elbows at the bottom), and one 90° elbow to form a circular whole. It is located on a relatively high platform foundation through five outer elbows connected to the outer pipe at the inner elbows. An axial flow pump is installed at the inner elbow at the bottom of the pipe string. The reaction material enters the pipe string reactor from the reaction material inlet 1A, is stirred and circulated in the pipe driven by the axial flow pump, and reacts under the action of a catalyst to form polypropylene in a slurry state, which is discharged from the reaction material outlet 1B and enters 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 pipe 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 pipe and the outer pipe, 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 profiles to form several space platforms.

[0005] There are areas for further improvement:

[0006] The structural form of the jacket sewage and exhaust ports is not standardized. The opening forms for sewage discharge at the bottom and exhaust at the top of the jacket include a plug with an annular seal plate, a jacket connecting pipe tightly attached to the seal plate surface, a small connecting pipe with an annular seal plate, and a thick connecting pipe with an annular seal plate, etc., each having its own advantages and disadvantages.

[0007] The tapered pipe thread (1) of the plug seal requires precise machining, (2) the plug hole is easily deformed by the welding heat of the surrounding rib plates, affecting assembly; (3) the threaded gap after assembly is also easily corroded. If the jacket liquid leaks and drips onto the main flange studs and nuts, it is easy to damage the main fasteners; (4) the operation space for the narrow-gap rib plates and the tightening wrench needs to be coordinated during design; (5) when the reactor is installed and the jacket is in an upright state, the plug seal is at the bottom of the seal ring. Compared with other seals such as the main flange, the plug is a secondary consideration object and requires looking up or bending down to approach, making it inconvenient to operate the wrench.

[0008] The small pipe led out by the group welding of the elbows requires welding, non-destructive testing, and also needs to be strengthened by rib plates. The radial opening connecting pipe on the jacket has a simple structure and appropriate strength and requires single-sided full penetration welding. Relatively speaking, the thick connecting pipe with an annular seal plate has a relatively high structural strength and is easy to achieve double-sided full penetration welding. However, these connecting pipes are easily damaged by accidental collisions.

[0009] In summary, in order to quickly adapt to the current market environment with a large demand for high-capacity and large-structure series tube reactors in petrochemical new construction and expansion, to meet the requirements of capacity increase, energy expansion, and upgrading of traditional series tube reactors, as well as the demand for high-capacity polypropylene production capacity of over 600,000 tons per year, developing a high-capacity series tube reactor with a new structure is of profound and significant industrial and economic significance. Summary of the Invention

[0010] In view of the above technical problems existing in the prior art, the utility model provides a series tube reactor with a jacket seal ring discharge port.

[0011] To achieve the above object, the utility model provides the following technical solutions:

[0012] Provide a series tube reactor with a jacket seal ring discharge port, including a plurality of straight tubes and a plurality of bent tubes. Each straight tube includes an inner tube and an outer tube, and the inner tube passes through the outer tube to form an annular straight jacket flow channel; the inner tubes of the plurality of straight tubes are connected in series via the bent tubes to form a medium flow channel for conveying reaction materials and carrying out reactions, and the straight jacket flow channels of the plurality of straight tubes are connected in series to form a cooling flow channel for conveying cooling medium. Sealing structures are provided at both ends of the straight jacket flow channel to seal both ends of the straight jacket flow channel; its characteristics are:

[0013] The sealing structure is an annular sealing plate. Both ends of the annular sealing plate are respectively fixed to the outer wall of the inner tube and the end of the outer tube. An exhaust hole channel is opened inside the annular sealing plate. The inner port of the exhaust hole channel communicates with the straight jacket flow channel, and the outer port of the exhaust hole channel extends to the transverse outer end face of the annular sealing plate. A plug is detachably arranged at the outer port of the annular sealing plate, so that the exhaust hole channel is in a normally closed state.

[0014] As a further optional, the series tube reactor further includes a plurality of jacket connecting pipes;

[0015] The straight jacket flow channels of the plurality of straight tubes are connected in series in the following way: the bent tube is a single-layer tube, and both ends of the jacket connecting pipe are connected to the side walls of the outer tubes of different straight tubes and communicate with the corresponding straight jacket flow channels, so that the straight jacket flow channels of adjacent two straight tubes are directly connected through the jacket connecting pipe;

[0016] Or, each bent tube is a double-layer tube including 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; the inner tubes of different straight tubes are connected in series via the inner elbow to form the medium flow channel; sealing structures are respectively provided at both ends of the bent jacket flow channel to seal both ends of the bent jacket flow channel. This sealing structure is also an annular sealing plate, and the corresponding exhaust hole channel and the plug are provided; one end of the jacket connecting pipe is connected to the side wall of the outer tube of the straight tube and communicates with the straight jacket flow channel, and the other end of the jacket connecting pipe is connected to the side wall of the outer elbow of the bent tube and communicates with the bent jacket flow channel, so that the straight jacket flow channels of adjacent two straight tubes are connected via the jacket connecting pipe and the bent jacket flow channel.

[0017] As a further option, the plug is a screw plug, and an internal thread for mating with the screw plug is provided at the outer port of the discharge channel.

[0018] As a further option, the screw plug is a round stud or a conical stud.

[0019] As a further option, the discharge channel is a corner through hole, which includes a longitudinal hole section and a transverse hole section that are sequentially connected, and the plug is horizontally inserted into the transverse hole section.

[0020] As a further option, the discharge channel is a straight through hole, and the straight through hole is arranged obliquely with respect to the axis of the straight sleeve, and the plug is correspondingly inserted obliquely into the straight through hole.

[0021] As a further option, the annular sealing plate is fixedly welded between the inner pipe and the outer pipe.

[0022] As a further option, a nozzle is resistance welded to the outer port of the discharge channel.

[0023] As a further option, the inner port of the discharge channel is circular, elliptical or polygonal.

[0024] As a further option, the number of discharge channels is multiple, and the multiple discharge channels are arranged circumferentially around the annular sealing plate.

[0025] Advantages of the present utility model:

[0026] A series pipe reactor with a jacketed seal ring discharge port according to the present utility model, compared with the prior art, on the one hand, is provided with a normally closed discharge channel, which is convenient for cleaning and discharging the deposited dirt in the jacket; on the other hand, the plug for blocking the discharge channel is located on the outer end face of the transverse direction of the annular sealing plate, with a simple and compact structure, easy for workers to operate, convenient for installation, disassembly and maintenance, and reducing the maintenance cost. Description of the drawings

[0027] Figure 1 It is a schematic structural diagram of a series pipe reactor in the prior art.

[0028] Figure 2 It is a schematic structural diagram of the jacketed seal ring discharge port of the series pipe reactor in the embodiment.

[0029] Figure 3 It is a schematic structural diagram of the jacketed seal ring discharge port of the series pipe reactor in another embodiment.

[0030] Figure 4 For Figure 3 Schematic diagram of further adding a nozzle. Specific embodiments

[0031] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0032] The string tube reactor of this embodiment includes multiple straight sleeve tubes and multiple bent tubes. The reaction material enters the string tube reactor from the reaction material inlet and discharges from the reaction material outlet. Each straight sleeve tube includes an inner tube and an outer tube, and the inner tube is inserted through the outer tube to form an annular straight jacket flow channel. The inner tubes of multiple straight sleeve tubes are connected in series via bent tubes to form a medium flow channel for conveying and reacting the reaction material, while the straight jacket flow channels of multiple straight sleeve tubes are connected in series to form a cooling flow channel for conveying the cooling medium.

[0033] The string tube reactor further includes multiple jacket connecting tubes; the straight jacket flow channels of multiple straight sleeve tubes are connected in series as follows: the bent tube is a single-layer tube, and both ends of the jacket connecting tube are connected to the side walls of the outer tubes of different straight sleeve tubes and communicate with the corresponding straight jacket flow channels, so that the straight jacket flow channels of two adjacent straight sleeve tubes are directly connected through the jacket connecting tube. This series connection structure is a traditional series connection method. Later, the inventor also designed the bent tube as a double-layer jacket structure, that is, each bent tube is a double-layer tube including 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; the inner tubes of different straight sleeve tubes are connected in series via the inner elbow to form the medium flow channel; sealing structures are respectively provided at both ends of the straight jacket flow channel and the bent jacket flow channel to seal the two ends of the straight jacket flow channel and the two ends of the bent jacket flow channel; one end of the jacket connecting tube is connected to the side wall of the outer tube of the straight sleeve tube and communicates with the straight jacket flow channel, and the other end of the jacket connecting tube is connected to the side wall of the outer elbow of the bent tube and communicates with the bent jacket flow channel, so that the straight jacket flow channels of two adjacent straight sleeve tubes are connected via the jacket connecting tube and the bent jacket flow channel. For the structures of the bent sleeve tube and the jacket connecting tube disclosed in Chinese patent documents with publication numbers CN219984696U, CN219984695U, and CN219984692U, no further elaboration will be made here.

[0034] The above is the basic structure of the existing string tube reactor. The string tube reactor of this embodiment also has these basics. As an improvement, for the sealing structures at both ends of the straight jacket flow channel and the bent jacket flow channel, taking the sealing structure of the straight sleeve tube as an example, as Figure 2 shown, the sealing structure is an annular sealing plate 1, and the annular sealing plate 1 is fixedly welded between the inner tube 2 and the outer tube 3. Both ends of the annular sealing plate 1 are respectively fixed to the outer wall of the inner tube 2 and the end of the outer tube 3. An exhaust hole channel 4 is opened inside the annular sealing plate 1. The inner port of the exhaust hole channel 4 communicates with the straight jacket flow channel 5, and the outer port of the exhaust hole channel 4 extends to the transverse outer end face of the annular sealing plate 1. A plug 6 is detachably arranged at the outer port of the annular sealing plate 1, so that the exhaust hole channel 4 is in a normally closed state.

[0035] Similarly, the annular sealing plate, the discharge channel, and the plug can be applied to the sealing structures at both ends of the elbow in the same matching manner.

[0036] In this embodiment, the plug 6 is a screw plug, and the outer port of the discharge channel 4 is provided with an internal thread for mating with the screw plug. The screw plug is a round stud or a conical stud.

[0037] One embodiment of the discharge channel 4 is as Figure 2 shown. The discharge channel 4 is a corner through hole, which includes a longitudinal hole section and a transverse hole section that are sequentially connected. The plug is horizontally inserted into the transverse hole section.

[0038] Another embodiment of the discharge channel 4 is as Figure 3 shown. The discharge channel 4 is a straight through hole, and the straight through hole is arranged obliquely with respect to the axis of the straight sleeve. The plug 6 is correspondingly inserted obliquely into the straight through hole.

[0039] As a Figure 3 further improvement, as Figure 4 shown, a nozzle 7 is resistance welded to the outer port of the discharge channel 4 for facilitating the connection of pipes.

[0040] In practice, the inner port of the discharge channel 4 is circular, elliptical, or polygonal.

[0041] In this embodiment, the number of the discharge channels 4 is multiple, and the multiple discharge channels are arranged circumferentially around the annular sealing plate.

[0042] 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 the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] 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 merely 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 fall within the scope of protection of the present invention.

[0044] In the description of the present invention, 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 invention product is usually placed during use. It is only for the convenience of describing the present invention 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 cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "arranged", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. It may be a mechanical connection or an electrical connection. It may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. 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 a jacket sealing ring discharge port, comprising a plurality of straight sleeves and a plurality of bent pipes, each straight sleeve comprising an inner pipe and an outer pipe, the inner pipe being inserted into the outer pipe to form an annular straight jacket flow channel; the inner pipes of the plurality of straight sleeves are connected in series via the bent pipes to form a medium flow channel for transporting and reacting reaction materials, and the straight jacket flow channels of the plurality of straight sleeves are connected in series to form a cooling flow channel for transporting cooling medium, and sealing structures are provided at both ends of the straight jacket flow channel to seal the two ends of the straight jacket flow channel; the characteristics are: The sealing structure is an annular sealing plate, the two ends of which are respectively fixed to the outer wall of the inner tube and the end of the outer tube. A discharge channel is opened inside the annular sealing plate, the inner port of the discharge channel is connected to the straight jacket flow channel, and the outer port of the discharge channel extends to the lateral outer end surface of the annular sealing plate. The outer port of the annular sealing plate is detachably provided with a plug, so that the discharge channel is in a normally closed state.

2. A series of pipe reactors with a jacket sealing ring discharge port according to claim 1, characterized in that: The series pipe reactor also includes a plurality of jacketed connecting pipes; The straight jacket flow passages of multiple straight sleeves are connected in series as follows: the elbow is a single-layer pipe, and the two ends of the jacket connecting pipe are connected to the outer pipe side walls of different straight sleeves and connected to the corresponding straight jacket flow passages, so that the straight jacket flow passages of two adjacent straight sleeves are directly connected through the jacket connecting pipe; Alternatively, each curved pipe is a double-layer pipe including an outer elbow and an inner elbow, the outer elbow is sleeved on the outer side of the inner elbow to form an annular curved jacket flow channel; the inner pipes of different straight sleeves are connected in series via the inner elbow to form the medium flow channel; the two ends of the curved jacket flow channel are respectively provided with sealing structures to seal the two ends of the curved jacket flow channel, and the sealing structure is also an annular sealing plate, correspondingly provided with the discharge channel and the plugging plug; one end of the jacket connecting pipe is connected to the outer pipe side wall of the straight sleeve and connected to the straight jacket flow channel, and the other end of the jacket connecting pipe is connected to the outer elbow side wall of the curved pipe and connected to the curved jacket flow channel, so that the straight jacket flow channels of two adjacent straight sleeves are connected via the jacket connecting pipe and the curved jacket flow channel.

3. A series of pipe reactors with a jacket seal ring discharge port according to claim 1, characterized in that The hole plug is a screw plug, and the outer port of the discharge channel is provided with an internal thread matching the screw plug.

4. A series of pipe reactors with a jacket seal ring discharge port according to claim 3, characterized in that The screw plug is a round stud or a tapered stud.

5. A series of pipe reactors with jacket sealing ring discharge ports according to claim 1, characterized in that: The discharge channel is a corner through hole, which includes a longitudinal hole section and a transverse hole section which are connected in sequence, and the hole plug is horizontally penetrated in the transverse hole section.

6. A series of pipe reactors with jacket sealing ring discharge ports according to claim 1, characterized in that: The discharge channel is a straight through hole, which is arranged obliquely relative to the axial direction of the straight sleeve, and the hole plug is correspondingly obliquely penetrated in the straight through hole.

7. A series of pipe reactors with jacketed sealing ring discharge ports according to claim 1, characterized in that: The annular sealing plate is welded and fixed to the inner tube and the outer tube.

8. A series of pipe reactors with jacket sealing ring discharge ports according to claim 1, characterized in that: The outer port of the discharge channel is resisted with a nozzle.

9. A series of pipe reactors with jacket sealing ring discharge ports according to claim 1, characterized in that The inner port of the discharge channel is circular, elliptical or polygonal.

10. A series of pipe reactors with jacket sealing ring discharge ports according to claim 1, characterized in that: There are multiple discharge channels, and the multiple discharge channels are arranged circumferentially around the annular sealing plate.

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