CN114345286A - Series pipe reactor with closed type waveform expansion joint - Google Patents

Abstract

The invention relates to the technical field of petrochemical equipment, in particular to a tandem reactor with a closed type waveform expansion joint, which comprises a straight sleeve, a jacket communicating pipe and an elbow, wherein the straight sleeve comprises an inner pipe and an outer pipe, the inner pipe penetrates through the outer pipe, the elbow and the inner pipe are sequentially connected in series to form a medium flow channel for conveying and reacting reaction materials, the jacket communicating pipe is positioned at the elbow and connected with the outer pipe, and the jacket flow channel formed between the inner pipe and the outer pipe is connected in series to form a cooling flow channel for conveying a cooling medium. The outer pipe of the straight sleeve is welded with an expansion joint, the expansion joint is a closed type wave-shaped expansion joint which is formed by bending a metal pipe and is welded at the head and the tail, the structure is compact, the stability is strong, the effects of absorbing uniform displacement caused by expansion and contraction and lifting non-uniform displacement caused by bending are achieved, the overall efficiency of the equipment is optimized, and the service life of the equipment is prolonged. The wave form of the pipe expansion joint is made of metal pipes, so that the problem of thinning existing in the traditional method of manufacturing the wave form expansion joint by adopting steel plates is solved.

Description

Series pipe reactor with closed type waveform expansion joint

Technical Field

The invention relates to the technical field of petrochemical equipment, in particular to a series-pipe reactor with a closed type waveform expansion joint.

Background

Polypropylene and polyethylene are the largest varieties of general synthetic resins in productivity and consumption, and their production techniques are 3, namely, slurry polymerization, gas phase polymerization and solution polymerization. The slurry process technology is a main method, and can be divided into two types, namely a stirred tank type and a series reactor according to the form of the reactor, wherein the series reactor is also called a loop reactor.

The traditional series reactor mainly comprises a plurality of straight sleeves, a jacket communicating pipe, an elbow, a mounting support, a connecting beam and the like according to the capacity, wherein each straight sleeve comprises an inner pipe and an outer pipe, and every two straight pipe cylinders and two bent pipes form a cycle. The heat can be generated by polymerization reaction, so that reaction heat is taken away by cold water shortage in the jacket, the outer pipe of the straight sleeve is provided with the waveform expansion joint, the mounting support and the supporting beam seat, the elbow is not provided with the sleeve pipe, the elbow is connected with the two ends of the inner pipe of the straight sleeve through the flanges to connect the straight sleeve into a flow whole, the jacket communicating pipe of the jacket connects the jacket of the straight sleeve into a flow whole, the connecting beam is connected with the supporting beam seat through the bolt, and the straight sleeve is combined into a three-dimensional frame. The series-wound reactor is a multi-foundation support, namely each straight sleeve is provided with an installation support, errors of the length, the axis position, the direction, the elevation, the distance and the like of the straight sleeve, and a plurality of factors such as the parallelism of the straight sleeve, the verticality of a flange, the manufacturing error of a bent pipe and the like can simultaneously influence the installation sealing performance of the ring pipe.

For a three-dimensional space structure of the whole series-tube reactor, a schematic diagram of which is shown in fig. 1, the vertically-installed series-tube reactor mainly comprises six straight sleeves (R1-R6), five large elbows (A1, A2, A3, B1 and B2) and a 90-degree elbow which are sequentially connected to form a circulating whole, and is located on a higher platform base through five jacket communicating tubes C1, C2, C3, C4 and C5 which are located at the elbows and connected with an outer tube, an axial-flow pump is arranged at the elbow at the bottom of the loop, a reactant enters the series-tube reactor from a reactant material inlet 1A, is stirred and circulated in the tube under the driving of the axial-flow pump, reacts under the action of a catalyst to form slurry polypropylene, and is discharged from a reactant material outlet 1B to enter a granulating system; the cooling medium enters from a cooling medium inlet 2A of the jacket flow passage, flows out from a cooling medium outlet 2F of the jacket flow passage, and the six mounting supports D1, D2, D3, D4, D5 and D6 are positioned below the straight sleeves R1, R2, R3, R4, R5 and R6. Five jacket communicating pipes are arranged between the jackets and connected with each other, and cooling water in the jackets takes away heat released by reaction in the inner pipe through the dividing wall to maintain normal operation of the reaction process.

Problems with the basic structure:

along with the shortage of petroleum resources, in order to adapt to the huge demand and development of the market on the special material for ethylene, new and more rigorous requirements are provided for the structure, the capacity and the quality of the tandem reactor equipment, chemical enterprises expect to reduce the cost and improve the market competitiveness of the price through the large-scale effect of high capacity, the capacity of the first domestication of a single tandem reactor in 1996 is 7 ten thousand tons/year, in 2009, the capacity of the polypropylene circulating reactor of the first solution polymerization method in China reaches 45 ten thousand tons/year, the traditional slurry polymerization method series reactor is challenged, at present, a great amount of series reactors with high-yield and large-structure are required in the expansion, and the capacity increasing, the energy expanding and the upgrading of the traditional series reactor are required, so that the capacity of the series reactor is urgently required to be gradually improved from 30 ten thousand tons/year to more than 45 ten thousand tons/year, 50 ten thousand tons/year and 60 ten thousand tons/year.

With the further expansion of the production capacity scale, the above-mentioned series-wound reactor in the prior art, because the straight casing adopts an integrated slender vertical structure, when the length of the straight casing exceeds 60 meters and even reaches 70 meters, the following disadvantages will occur: (1) the difference of expansion with heat and contraction with cold displacement between the inner pipe and the outer pipe of the tandem reactor is increased, the number of the wave shapes of the expansion joints on the jacket is increased to more than 6, the design and manufacture and the quality guarantee of the multi-wave expansion joints become new problems, and the integral manufacturing precision is lower and lower; (2) when the steel plate is used as a raw material to manufacture the waveform, the plate has large size, and the plate is difficult to flow along the stretching forming direction in the expansion forming process, so that the more serious problem of forming and thinning at the crest exists, and the local manufacturing precision is lower and lower; (3) in order to deal with the reduction, the thickness of the blank steel plate must be increased, but the increase of the thickness can improve the rigidity of the waveform, reduce the flexibility of the waveform and weaken the function and the service life of the expansion joint, which is a contradiction difficult to reconcile.

To sum up, in order to rapidly adapt to the newly-built market environment of the current petrochemical industry, the expansion joint with a new structure is developed to meet the requirement of a series-wound reactor with high performance, and the expansion joint has profound and important significance in industry and economy.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a series pipe reactor with a closed type waveform expansion joint.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a tandem reactor with closed wave form expansion joint, including many straight-tube shells, press from both sides cover communicating pipe, elbow and erection support, straight-tube shell is including inner tube and outer tube, the inner tube is worn to establish in the outer tube, elbow and inner tube series connection in proper order supply the reaction material to carry and the medium runner of reaction, press from both sides the cover communicating pipe and be located elbow department and be connected with the outer tube, establish ties into the cooling runner of carrying cooling medium with the cover runner that forms between inner tube and the outer tube, erection support sets up in the outside of outer tube and makes straight-tube shell divide into pipeline section and lower pipeline section, straight-tube shell's outer tube assembly welding has the expansion joint, a serial communication port, the expansion joint forms the closed wave form expansion joint of the ring shell form of end to end assembly welding for the tubular metal resonator bending.

Specifically, the closed type waveform expansion joint is a single-wave expansion joint formed by a single ring shell or a multi-wave expansion joint formed by stitch welding of more than two ring shells, the rigidity of the multi-wave expansion joint is low, the quality is more ensured, and the closed type waveform expansion joint has the characteristics of good effect of absorbing the displacement caused by expansion with heat and contraction with cold and excellent overall structure function.

Specifically, the closed-type wave-shaped expansion joint is obliquely arranged relative to the outer pipe; or the closed type waveform expansion joint is arranged opposite to the outer pipe, the length of the butt welding seal is increased by the inclined butt expansion joint, so that the strength of the welding joint between the waveforms and the outer pipe is improved, the length of the welding seam of any cross section of the straight sleeve is only a small part, the waveform metal pipe occupies a large part and bears most of axial stress, the axial stress of the welding seam is reduced, and the service life of the reactor is prolonged.

Specifically, the closed type waveform expansion joint is a fully closed ring pipe.

Specifically, the ring pipe is provided with a pipe orifice, and the side of the straight sleeve pipe is provided with a pressure regulating mechanism for injecting media into the ring pipe so as to regulate the pressure in the ring pipe.

Specifically, the closed type waveform expansion joint is a semi-closed ring pipe with an opening on the inner side, and the opening is a hole or a gap.

Specifically, all outer pipes in the plurality of straight sleeves are provided with the closed type waveform expansion joints; or only part of the outer pipe in the plurality of straight sleeves is provided with the closed type wave-shaped expansion joint.

Specifically, the upper pipe section and the lower pipe section of the same straight sleeve are respectively provided with the closed type waveform expansion joint; or only one of the upper pipe section and the lower pipe section of the same straight sleeve is provided with the closed type wave-shaped expansion joint.

Specifically, the metal pipe is of a single-layer structure or a structure with more than two layers.

Specifically, the metal pipe is of a multi-layer same-material structure or a multi-layer different-material structure, and the different-material structure comprises an anti-corrosion inner layer and an elastic outer layer.

The invention has the beneficial effects that:

compared with the prior art, the tandem reactor with the closed type waveform expansion joint has the advantages that the closed type waveform expansion joint is compact in structure and strong in stability, has the effects of absorbing uniform displacement caused by thermal expansion and cold contraction and lifting non-uniform displacement caused by bending, optimizes the overall efficiency of equipment and prolongs the service life of the equipment. The waveform of the pipe expansion joint is manufactured by adopting a metal pipe as a raw material, the structure is compact, the waveform forming precision is high, the thinning problem existing in the conventional method for manufacturing the waveform expansion joint by adopting a steel plate as the raw material is avoided, and the thickness of a blank steel plate is not required to be increased for coping with the thinning.

Drawings

FIG. 1 is a schematic diagram of a prior art series reactor configuration.

FIG. 2 is a schematic structural diagram of a first embodiment of a series reactor of the present invention having a closed waveform expansion joint.

FIG. 3 is a schematic structural diagram of a second embodiment of a series reactor of the present invention having a closed waveform expansion joint.

FIG. 4 is a schematic structural diagram of a third embodiment of a series reactor of the present invention having a closed waveform expansion joint.

FIG. 5 is a schematic structural diagram of a fourth embodiment of a series reactor of the present invention having a closed waveform expansion joint.

FIG. 6 is a schematic structural diagram of a fifth embodiment of a series reactor with closed waveform expansion joints according to the present invention.

FIG. 7 is a schematic structural diagram of a sixth embodiment of a series reactor of the present invention having closed waveform expansion joints.

FIG. 8 is a schematic structural diagram of a seventh embodiment of a series reactor with closed waveform expansion joints of the present invention.

FIG. 9 is a schematic structural diagram of an eighth embodiment of a series reactor with closed waveform expansion joints of the present invention.

FIG. 10 is a schematic structural diagram of a ninth embodiment of a series reactor of the present invention having closed waveform expansion joints.

Reference numerals:

in fig. 1, included are:

r1, R2, R3, R4, R5, R6-straight cannula;

a1, A2, A3, B1, B2, B3-elbows;

c1, C2, C3, C4 and C5-jacket communicating pipe;

d1, D2, D3, D4, D5, D6-mounting bracket;

2A-cooling medium inlet of jacket flow channel; 2F-cooling medium outflow of jacket flow channel;

1A-inlet for reaction mass; 1B-outflow of the reaction mixture.

Fig. 2 to 10 include:

101-outer tube, 102-inner tube,

11-an upper pipe section, 12-a lower pipe section,

211-oblique butt joint multi-wave expansion joint,

212-oblique butt joint double wave expansion joint,

214-oblique butt-joint totally-enclosed wave-shaped expansion joint,

215-oblique butt joint semi-closed wave-shaped expansion joint,

216-oblique butt-joint inner-opening wave-shaped expansion joint,

217-full-closed wave-shaped expansion joint,

218-positive butt-joint semi-closed wave-shaped expansion joint,

219-opposite connecting inner opening wave-shaped expansion joint,

22-intermittent multi-wave expansion joint,

23-intermittent single wave expansion joint,

30-mounting support,

50-circumferential weld,

L-shaped corrugated inner opening gap of expansion joint,

O-the inner hole of the expansion joint wave shape.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments and the accompanying drawings.

The specific embodiment of the tandem reactor with closed waveform expansion joints of the present invention, as shown in fig. 2-10, comprises a plurality of straight sleeves, jacket communicating pipes, elbows and mounting supports 30, wherein each straight sleeve comprises an inner pipe 102 and an outer pipe 101, the inner pipe 102 is inserted into the outer pipe 101, the elbows and the inner pipe 102 are sequentially connected in series to form a medium flow channel for conveying and reacting reaction materials, the jacket communicating pipes are positioned at the elbows and connected with the outer pipe 101, the jacket flow channels formed between the inner pipe 102 and the outer pipe 101 are connected in series to form a cooling flow channel for conveying a cooling medium, the mounting supports 30 are arranged at the outer side of the outer pipe to divide the straight sleeves into an upper pipe section 11 and a lower pipe section 12, and the expansion joints are welded on the outer pipe 101 of the straight sleeves. The improvement of the invention is that: the expansion joint is a closed wave-shaped expansion joint which is formed by bending a metal pipe to form a ring shell shape and is welded at the head and the tail, and the assembly welding between two adjacent wave expansion joints of the multi-wave expansion joint and between the multi-wave expansion joint and the outer pipe 101 is realized through a circumferential weld 50.

The closed type wave-shaped expansion joint can be manufactured by adopting a steel pipe as a raw material, the forming precision of the steel pipe is high, the wall thickness can be very thin, a section of the steel pipe is rolled, formed and then is assembled and welded end to form a closed annular shell, each annular shell is used as a wave of the expansion joint, and a plurality of annular shells are assembled and welded together to form the multi-wave expansion joint. The expansion joint has the advantages of low axial rigidity, high axial flexibility, high radial rigidity, low radial flexibility, excellent overall performance, better quality guarantee, good effect of absorbing expansion caused by heat and contraction caused by cold, and excellent overall structure function.

Specifically, the closed type wave expansion joint is a single wave expansion joint formed by a single ring shell, or a multi-wave expansion joint formed by stitch welding of more than two ring shells. The closed type wave-shaped expansion joint is obliquely arranged relative to the outer pipe; or the closed wave-shaped expansion joint is arranged opposite to the outer pipe. Such as diagonally butted multi-wave expansion joint 211 and diagonally butted double wave expansion joint 212 shown in fig. 2.

Specifically, the closed type wave-shaped expansion joint is a fully closed loop pipe, such as an oblique butt joint fully closed wave-shaped expansion joint 214 shown in fig. 5, an oblique butt joint internally opened hole wave-shaped expansion joint 216 shown in fig. 7, and a direct butt joint fully closed wave-shaped expansion joint 217 shown in fig. 8. In practice, the pipe orifice can be arranged on the circular pipe, and the pressure regulating mechanism for injecting media into the circular pipe is arranged beside the straight sleeve pipe so as to regulate the pressure in the circular pipe and the rigidity of the expansion joint.

In another embodiment, the closed type wave-shaped expansion joint is a semi-closed ring pipe with an opening on the inner side, the opening is an opening or a slotted gap, the opening gap or a small opening on the wave-shaped inner side of the expansion joint can enable the wave-shaped inner cavity to be communicated with the space in the jacket, and the pressure of the medium is balanced. Such as the diagonally butted semi-closed wave-shaped expansion joint 215 shown in fig. 6, the diagonally butted internally perforated wave-shaped expansion joint 216 shown in fig. 7, the facing butted semi-closed wave-shaped expansion joint 218 shown in fig. 9, and the facing butted internally perforated wave-shaped expansion joint 219 shown in fig. 10. These openings are expansion joint wave shaped inner opening slits L or expansion joint wave shaped inner opening holes O.

Specifically, the upper pipe section and the lower pipe section of the same straight casing shown in fig. 2 are respectively provided with the closed type waveform expansion joint; or both the upper and lower tubular sections of the same straight casing as shown in figure 3, are provided with the closed wave-shaped expansion joints. Specifically, all outer pipes in the plurality of straight sleeves are provided with the closed type waveform expansion joints; or only part of the outer pipe in the plurality of straight sleeves is provided with the closed type wave-shaped expansion joint. Or the straight casing shown in fig. 4 may contain an inventive closed wave expansion joint or a conventional expansion joint. For example, fig. 3 and 4 show that the upper pipe section 11 is provided with an oblique butt joint multiple wave expansion joint 211, and the lower pipe section 12 is provided with a conventional intermittent multiple wave expansion joint 22 and an intermittent single wave expansion joint 23.

Specifically, the metal pipe is of a single-layer structure or a structure with more than two layers, the metal pipe with the structure with more than two layers is of a multi-layer same-material structure or a multi-layer dissimilar-material structure, and the dissimilar-material structure comprises an anti-corrosion inner layer and an elastic outer layer.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. The utility model provides a tandem reactor with closed wave form expansion joint, including many straight-tube shells, press from both sides cover communicating pipe, elbow and erection support, straight-tube shell is including inner tube and outer tube, the inner tube is worn to establish in the outer tube, elbow and inner tube series connection in proper order supply the reaction material to carry and the medium runner of reaction, it is located elbow department and outer union coupling to press from both sides the cover communicating pipe, establish ties into the cooling runner that carries cooling medium with the cover runner that forms between inner tube and the outer tube, erection support sets up and makes straight-tube shell divide into upper segment and lower pipe section in the outside of outer tube, straight-tube shell's outer tube assembly welding has the expansion joint, a serial communication port, the expansion joint is the metal pipe bending forms the closed wave form expansion joint of the ring shell form of end to end assembly welding.

2. The series reactor of claim 1, wherein the closed-type waveform expansion joint comprises: the closed type wave expansion joint is a single wave expansion joint formed by a single ring shell or a multi-wave expansion joint formed by stitch welding of more than two ring shells.

3. The series reactor of claim 1, wherein the closed-type waveform expansion joint comprises: the closed type wave-shaped expansion joint is obliquely arranged relative to the outer pipe; or the closed wave-shaped expansion joint is arranged opposite to the outer pipe.

4. The series reactor of claim 1, wherein the closed-type waveform expansion joint comprises: the closed type wave-shaped expansion joint is a fully closed ring pipe.

5. The series reactor of claim 4 having a closed waveform expansion joint, wherein: the ring pipe is equipped with the mouth of pipe, and straight sheathed tube side is equipped with the pressure regulating mechanism of pouring into the medium into the ring pipe to the intraductal pressure of adjustable ring.

6. The series reactor of claim 1, wherein the closed-type waveform expansion joint comprises: the closed type waveform expansion joint is a semi-closed ring pipe with an opening on the inner side, and the opening is a hole or a gap.

7. The series reactor of claim 1, wherein the closed-type waveform expansion joint comprises: all outer pipes in the plurality of straight sleeves are provided with the closed type waveform expansion joints; or only part of the outer pipe in the plurality of straight sleeves is provided with the closed type wave-shaped expansion joint.

8. The series reactor of claim 1, wherein the closed-type waveform expansion joint comprises: the upper pipe section and the lower pipe section of the same straight sleeve are respectively provided with the closed type waveform expansion joint; or only one of the upper pipe section and the lower pipe section of the same straight sleeve is provided with the closed type wave-shaped expansion joint.

9. The series reactor of claim 1, wherein the closed-type waveform expansion joint comprises: the metal pipe is of a single-layer structure or a structure with more than two layers.

10. The series reactor of claim 1, wherein the closed-type waveform expansion joint comprises: the metal pipe is of a multi-layer same material structure or a multi-layer dissimilar material structure, and the dissimilar material structure comprises an anti-corrosion inner layer and an elastic outer layer.

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