Jacket spiral flow guide serial pipe reactor

Abstract

The utility model relates to the technical field of petrochemical equipment, in particular to a serial pipe reactor with a spiral guide jacket, 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; the inner pipes of the multiple straight sleeves are connected in series through the bent pipes to form a medium flow channel for conveying and reacting reaction materials, the straight jacket flow channels of the multiple straight sleeves are connected in series to form a cooling flow channel for conveying cooling media, spiral flow deflectors are arranged in the straight jacket flow channels, the inner sides of the flow deflectors are fixed to the outer walls of the inner pipes, or the outer sides of the flow deflectors are fixed to the inner walls of the outer pipes. A plurality of notches are formed in the inner side and / or the outer side of the flow deflector in the spiral direction. The flow deflectors enable a medium in the jacket to spirally flow, the medium passing through the notches axially flows, the outer wall of the inner pipe and / or the inner wall of the outer pipe are / is scoured, and when fluids in different directions meet, turbulent flow is formed, laminar deposition is avoided, and the heat exchange and reaction effects are improved.

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 jacketed spiral flow guide. 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 the stirred tank type and the string tube reactor.

[0003] The traditional string tube reactor mainly consists of several straight sleeve pipes, outer elbows, inner elbows, installation 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, an installation support and a support beam 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 support beam seat through bolts to combine the straight sleeve pipes into a three-dimensional framework. The string tube reactor is supported by multiple bases, that is, each straight sleeve pipe has its own installation support. Many factors such as the errors of the length, axis position, orientation, elevation, spacing, etc. of the straight sleeve pipe, as well as the parallelism of the straight sleeve pipe, the perpendicularity of the flange, and the manufacturing errors of the elbows 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 tube-in-tube reactor mainly consists of six straight sleeves (the first straight sleeve R1, the second straight sleeve R2, the third straight sleeve R3, the fourth straight sleeve R4, the fifth straight sleeve R5, and the sixth straight sleeve R6), five 180° large elbows (the first elbow A1, the second elbow A2, the third elbow A3, and two elbows at the bottom), and a 90° elbow connected in sequence to form a circular whole. It is located on a relatively high platform foundation through five outer elbows connected to the outer tube at the inner elbows. An axial flow pump is provided at the inner elbow at the bottom of the tube-in-tube. The reaction material enters the tube-in-tube reactor from the reaction material inlet 1A, is stirred and circulated in the tube under the drive of the axial flow pump, and reacts to form slurry polypropylene under the action of the catalyst, 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, and adjacent jackets are connected by steel profiles to form several space platforms.

[0005] There are areas for further improvement:

[0006] The medium particles flowing in the jacket are likely to accumulate on the outer wall of the inner tube or the inner wall of the outer tube, and dirt is likely to deposit after long-term use, affecting the fluidity of the medium in the jacket. Summary of the Invention

[0007] In view of all or part of the above technical problems existing in the prior art, the present utility model provides a tube-in-tube reactor with a spiral guide in the jacket.

[0008] To achieve the above object, the present utility model provides the following technical solutions:

[0009] Provide a tube-in-tube reactor with a spiral guide in the jacket, including a plurality of straight sleeves and a plurality of bent pipes. Each straight sleeve 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 sleeves are connected in series via the bent pipes to form a medium flow channel for transporting and reacting the reaction material, and the straight jacket flow channels of the plurality of straight sleeves are connected in series to form a cooling flow channel for transporting the cooling medium. The feature is that: spiral guide vanes are arranged in the straight jacket flow channel, the inner side of the guide vane is fixed to the outer wall of the inner tube or the outer side of the guide vane is fixed to the inner wall of the outer tube, and a plurality of notches are arranged at intervals along the spiral direction on the inner side and / or the outer side of the guide vane.

[0010] As a further optional solution, the guide vanes are arranged with equal pitch or variable pitch.

[0011] As a further alternative, a plurality of the notches are evenly spaced or unevenly spaced along the spiral direction.

[0012] As a further alternative, the shape of the notch is one or a combination of two of U-shaped and polygonal.

[0013] As a further alternative, a part of the side of the flow guide piece is punched or cut to form the notch.

[0014] As a further alternative, a pressing notch is formed on the side of the flow guide piece as the notch, and an opening is provided on one side or both sides of the pressing notch.

[0015] As a further alternative, the whole flow guide piece is covered with the notches at intervals, or only partial segments of the flow guide piece are distributed with the notches at intervals.

[0016] As a further alternative, the notches on the inner and outer sides of the flow guide piece are arranged staggeredly in the width direction.

[0017] As a further alternative, the inner side of the flow guide piece is welded and fixed to the outer wall of the inner tube, or: the outer side of the flow guide piece is welded and fixed to the inner wall of the outer tube.

[0018] As a further alternative, the series of tube reactors further includes a plurality of jacket connecting pipes; sealing structures are provided at both ends of the straight jacket flow channel to seal both ends of the straight jacket flow channel;

[0019] The straight jacket flow channels of a plurality of straight sleeve pipes are connected in series in the following way: the bent pipe is a single-layer pipe, and both ends of the jacket connecting pipe are connected to the outer pipe side walls of different straight sleeve pipes and communicate with the corresponding straight jacket flow channels, so that the straight jacket flow channels of adjacent two straight sleeve pipes are directly communicated through the jacket connecting pipe;

[0020] Or, each bent pipe is a double-layer pipe 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 pipes of different straight sleeve pipes are connected in series through the inner elbows 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; one end of the jacket connecting pipe is connected to the outer pipe side wall of the straight sleeve pipe and communicates with the straight jacket flow channel, and the other end of the jacket connecting pipe is connected to the outer elbow side wall of the bent pipe and communicates with the bent jacket flow channel, so that the straight jacket flow channels of adjacent two straight sleeve pipes are communicated through the jacket connecting pipe and the bent jacket flow channel.

[0021] As a further alternative, the flow guide piece is also provided in the bent jacket flow channel.

[0022] The beneficial effects of the present utility model:

[0023] A string tube reactor with a jacket spiral flow guide of the present utility model is applicable not only to the production of polyethylene and polypropylene in petrochemical industry, but also to other production processes in petrochemical industry. Compared with the prior art, it has the following advantages: a spiral flow guide plate is arranged in the jacket, and a plurality of notches are arranged on the inner side and / or the outer side of the flow guide plate along the spiral direction. The flow guide plate makes the medium in the jacket flow spirally, while the medium passing through the notches flows axially, which plays a scouring role on the outer wall of the inner tube and / or the inner wall of the outer tube. The meeting of fluids in different directions helps to form turbulence, avoid laminar deposition, and improve the heat transfer and reaction effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 FIG. is a schematic structural view of a string rod reactor of the prior art.

[0025] Figure 2 FIG. is a schematic view of a straight sleeve of a string tube reactor with a jacket spiral flow guide in an embodiment, in which the outer tube is shown in cross-section.

[0026] Figure 3 is Figure 2 an enlarged view of the circled position.

[0027] Figure 4 FIG. is a schematic structural view of the flow guide plate in an embodiment.

[0028] Figure 5 FIG. is a schematic view of a notch in another form of the flow guide plate, in which both sides of the pressed notch are closed, and the flow guide plate body is briefly shown.

[0029] Figure 6 is Figure 5 a schematic view of further opening on the left side of the pressed notch.

[0030] Figure 7 is Figure 5 a schematic view of further opening on the right side of the pressed notch.

[0031] Figure 8 is Figure 5 a schematic view of further opening on both the left and right sides of the pressed notch.

[0032] REFERENCE MARKS:

[0033] Inner tube 1, outer tube 2, straight jacket flow channel 3, flow guide plate 4, notch 41. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Hereinafter, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Without conflict, the following embodiments and the features in the embodiments may be combined with each other.

[0035] A string tube reactor with a jacket spiral flow guide in this embodiment, such asFigures 1 to 4 As shown, it includes six straight sleeves and multiple bent pipes. The reaction material enters the series pipe reactor at the reaction material inlet 1A and discharges at the reaction material outlet 1B. Each straight sleeve includes an inner pipe 1 and an outer pipe 2, and the inner pipe 1 is inserted through the outer pipe 2 to form an annular straight jacket flow channel 3. The inner pipes 1 of multiple straight sleeves are connected in series via bent pipes to form a medium flow channel for conveying and reacting the reaction material, while the straight jacket flow channels 3 of multiple straight sleeves are connected in series to form a cooling flow channel for conveying the cooling medium.

[0036] This series pipe reactor also includes multiple jacket connecting pipes; the straight jacket flow channels 3 of multiple straight sleeves are connected in series in the following way: the bent pipe is a single-layer pipe, and both ends of the jacket connecting pipe are connected to the side wall of the outer pipe 2 of different straight sleeves and communicate with the corresponding straight jacket flow channels 3, so that the straight jacket flow channels 3 of adjacent two straight sleeves are directly connected through the jacket connecting pipe. This series structure is a traditional series method. Later, the inventor also designed the bent pipe as a double-layer jacket structure, that is, each bent pipe is a double-layer pipe 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 pipes 1 of different straight sleeves 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 3 and the bent jacket flow channel to seal the two ports at both ends of the straight jacket flow channel 3 and the two ports at both ends of the bent jacket flow channel; one end of the jacket connecting pipe is connected to the side wall of the outer pipe 2 of the straight sleeve and communicates with the straight jacket flow channel 3, and the other end of the jacket connecting pipe is connected to the side wall of the outer elbow of the bent pipe and communicates with the bent jacket flow channel, so that the straight jacket flow channels 3 of adjacent two straight sleeves are connected via the jacket connecting pipe and the bent jacket flow channel. For the structure of the bent sleeve and the jacket connecting pipe disclosed in Chinese patent documents with publication numbers CN219984696U, CN219984695U, and CN219984692U, reference can be made here without further elaboration.

[0037] The above is the basic structure of the existing series pipe reactor, and the series pipe reactor of this embodiment also has these bases. As an improvement:

[0038] A spiral guide vane 4 is arranged in the straight jacket flow channel 3, and the inner side of the guide vane 4 is fixed to the outer wall of the inner pipe 1 or the outer side of the guide vane 4 is fixed to the inner wall of the outer pipe 2. During manufacturing, first, the guide vane 4 is helically welded and fixed to the outer wall of the inner pipe 1, and then the inner pipe 1 is inserted into the outer pipe 2, and the outer side of the guide vane 4 is in clearance fit with the inner wall of the outer pipe 2. Or first, the guide vane 4 is helically welded and fixed to the inner wall of the outer pipe 2, and then the inner pipe 1 is inserted into the inner side of the guide vane 4, and the inner side of the guide vane 4 is in clearance fit with the outer wall of the inner pipe 1. Multiple notches 41 are arranged on the inner side and the outer side of the guide vane 4 along the spiral direction. Of course, in practice, only multiple notches 41 can be selected to be arranged on the inner side or only on the outer side according to process requirements. The guide vane 4 with multiple notches 41 can also be arranged in the bent jacket flow channel according to needs.

[0039] In this embodiment, the guide vane 4 is arranged with a variable pitch, that is, along the spiral direction, the pitch of a local segment is larger, while that of a local segment is smaller. Of course, it can be changed to an equal pitch arrangement according to actual needs.

[0040] In this embodiment, the plurality of notches 41 are evenly spaced along the spiral direction, that is, the distance between two adjacent notches 41 is the same. Of course, the notches 41 can be unevenly spaced, and the notches 41 can be more densely arranged or have a larger opening at locations where deposition is likely to occur.

[0041] In this embodiment, the shape of the notch 41 is a U-shape or a polygon, or a combination of the two.

[0042] In this embodiment, the notch 41 is formed by stamping or cutting the guide plate 4, that is, removing the side of the guide plate 4, such as Figures 2 - 4 The gap can also be formed as follows: Figures 5 to 8 As shown, the side of the guide plate forms a pressed notch as the notch, and the pressed notches closed on both sides are as shown in FIG. Figure 5 As shown, after the pressed notch is stamped, it deviates from the outer wall of the inner tube or the inner wall of the outer tube, thereby forming a gap through which the medium can flow, such as Figure 6 and Figure 7 As shown, an opening is provided on one side of the pressed notch, or as shown Figure 8 The pressed notch shown has openings on both sides to increase the flow area.

[0043] In practice, the notch 41 is formed in the long metal strip, and then the whole strip is wound into a spiral shape.

[0044] In this embodiment, the guide plate 4 is entirely distributed with the notches 41 , or the guide plate 4 is only partially distributed with the notches 41 .

[0045] In this embodiment, the notches 41 on the inner and outer sides of the guide plate 4 are staggered in the width direction to ensure the depth of the guide plate 4. The depth of the notch 41 is less than half of the width of the guide plate 4.

[0046] In this embodiment, the inner side of the guide plate 4 is welded and fixed to the outer wall of the inner tube 1 , and the outer side of the guide plate 4 is welded and fixed to the inner wall of the outer tube 2 .

[0047] In the description of the present invention, it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0048] 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 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.

[0049] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inside", "above", "below", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive 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 should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "set", "connected", "coupled" 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 invention can be understood according to specific circumstances.

Claims

1. A jacket spiral flow-guiding series pipe reactor, comprising a plurality of straight sleeves and a plurality of curved 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 curved pipes to form a medium flow channel for transporting reaction materials and reacting, 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, wherein: A spiral guide vane is arranged in the straight jacket flow channel, the inner side of the guide vane is fixed to the outer wall of the inner tube or the outer side of the guide vane is fixed to the inner wall of the outer tube, and a plurality of notches are arranged at intervals on the inner side and / or the outer side of the guide vane along the spiral direction.

2. A jacketed spiral flow-guiding series pipe reactor according to claim 1, characterized in that: Guide vane equal pitch setting, or variable pitch setting.

3. A jacketed spiral flow-guiding series pipe reactor according to claim 1, characterized in that: The plurality of notches are evenly spaced or unevenly spaced along the spiral direction.

4. A jacketed spiral flow-guiding series pipe reactor according to claim 1, characterized in that: The shape of the notch is one of a U-shape and a polygon or a combination of both; and / or: the notches on the inner and outer sides of the guide plate are staggered in the width direction.

5. The jacketed spiral flow-guiding series pipe reactor according to claim 1, characterized in that: The notch is formed by partially punching or cutting a side portion of the guide plate.

6. A jacketed spiral flow-guiding series pipe reactor according to claim 1, characterized in that: A pressing notch is formed on the side of the guide plate as the notch, and an opening is arranged on one side or both sides of the pressing notch.

7. The jacketed spiral flow-guiding series pipe reactor according to claim 1, characterized in that: The notches are distributed throughout the entire guide plate, or the notches are distributed only in local sections of the guide plate.

8. The jacketed spiral flow-guiding series pipe reactor according to claim 1, characterized in that: The inner side of the guide plate is welded and fixed to the outer wall of the inner tube, or the outer side of the guide plate is welded and fixed to the inner wall of the outer tube.

9. The jacketed spiral flow-guiding series pipe reactor according to claim 1, characterized in that: The series pipe reactor also includes a plurality of jacket connecting pipes; sealing structures are provided at both ends of the straight jacket flow channel, thereby sealing the two ends of the straight jacket flow channel; 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; 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.

10. A jacketed spiral flow-guiding series pipe reactor according to claim 9, characterized in that: The guide vane is also arranged in the curved jacket flow channel.

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