CN212017744U - Loop reactor with heightening support - Google Patents

Abstract

The utility model discloses a loop reactor with increase support, including many straight sleeves, many jacket communicating pipes, a plurality of elbows, a plurality of supporting ring seats and axial-flow pump, every straight sleeve includes inner tube and outer tube, and outer pipe box is outside the inner tube, and a plurality of elbows are established ties a plurality of inner tubes and axial-flow pump in proper order and are linked together to form the intercommunication runner that is used for carrying reaction material, and the axial-flow pump is located the elbow that the lower extreme of straight sleeve is connected; the jacket communicating pipe is positioned at the elbow and connected with the outer pipe, so that the space between the inner pipe and the outer pipe is connected in series to form another communicating flow channel for conveying a cooling medium; in practice, suppliers who supply parts such as straight sleeves and elbows can reserve the position of assembling the axial flow pump in advance according to the location of the assembly jig, and at the assembly site, the assembly personnel can quickly and timely carry out centering connection on the axial flow pump and the elbows according to the relative position of the base and the supporting blocks of the assembly jig, play a supporting role in supporting the axial flow pump and are more convenient to install.

Description

Loop reactor with heightening support

Technical Field

The utility model relates to a special machinery of petrochemical equips technical field, concretely relates to loop reactor with increase support.

Background

Polypropylene and polyethylene are the largest varieties of general synthetic resins in yield and consumption, and there are three production techniques: slurry polymerization, gas phase polymerization, and solution polymerization. The slurry process technology is a main process and can be classified into a stirred tank type and a loop reactor according to the form of the reactor.

As shown in figure 1, the loop reactor comprises a plurality of straight sleeves, jacket communicating pipes (C1-C5), elbows, supporting ring seats, connecting beams and the like, wherein every two straight tube cylinders and two bent tubes form a cycle. The axial-flow pump is mainly formed by sequentially connecting six straight sleeve type cylinders (R1, R2, R6), five large elbows of 180 degrees (A1, A2, A3, B1 and B2) and a 90-degree elbow B3 to form a circulating whole, wherein a main body is located on a higher platform foundation, and an axial-flow pump is located on a ground foundation. An axial flow pump is arranged at the elbow at the bottom of the loop, reaction materials enter the loop reactor from the position 1A, are stirred and circulated in the loop reactor under the driving of the axial flow pump, react to form pulpous polypropylene under the action of a catalyst, and are discharged from the position 1B to enter a granulation system; 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.

The polymerization reaction can generate heat, so the reaction heat is taken away by cold water shortage in the jacket, the outer pipe of the straight sleeve is provided with a waveform expansion joint, a supporting ring seat (D1-D6) and a supporting beam seat, the elbow is not provided with a sleeve, the elbow is connected with the two ends of the inner pipe of the straight sleeve through flanges to enable the straight sleeve to be connected into a whole flow, the jacket communicating pipe enables the jacket of the straight sleeve to be connected into a whole flow, the connecting beam is connected with the supporting beam seat through bolts, and the straight sleeve is combined into a three-dimensional frame. The loop reactor is a multi-foundation support, namely each straight sleeve is provided with a supporting ring seat, 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 loop pipe.

Olefin is a flammable and explosive medium, and the sealing performance of the loop reactor is the key of the long-term stability and long-term load operation of the device. The axial flow pump is supplied by a single manufacturer, and other parts except the axial flow pump are supplied by another manufacturer, so that when parts such as a straight sleeve, an elbow and the like are manufactured, an assembly position for assembling the axial flow pump needs to be reserved in advance, and the traditional design and manufacturing technical requirements of the domestic and domestic loop reactors are met. The straight sleeve and the support ring seat thereof are firstly assembled and welded in the stage of manufacturing the loop reactor. In the vertical installation stage of the loop reactor, each straight sleeve is supported on a reinforced concrete framework of the high-altitude platform by a support ring seat which is pre-assembled and welded, and then the positioning size of the ground foundation axial-flow pump is measured and adjusted. Due to the lack of supporting positioning of the axial flow pump, the following problems may exist in practice:

the structure is difficult to be installed in a closed manner, and in order to meet the huge demand and development of the market for the special material for the ethylene, the capacity scale of the loop reactor equipment is gradually improved from 7 ten thousand tons/year capacity in the nineties to 40 ten thousand tons/year capacity, and the development is oriented to more than 50 ten thousand tons/year. In a large-scale annular pipe reactor, the space elevation difference between a straight sleeve installation reference surface and an axial flow pump installation reference surface is enlarged, a straight section, an elbow and an auxiliary series of detection port pipelines of a main body are densely installed in a front limited space and a rear limited space of the axial flow pump, the matching precision requirement among all parts is high, the large-scale axial flow pump is difficult to finely adjust, the traditional interface structure does not have the assembling elasticity among all parts, and the rigorous assembling precision between the outlet of the axial flow pump and the inlet of the reactor cannot be guaranteed. Therefore, the closed installation of the loop reactor equipment only needs to leave a section of connecting elbow and the loose-joint flange thereof for assembly welding on the site, and the elbow port, the axial flow pump outlet and the reactor inlet are connected in a centering way by cutting and polishing.

According to relevant regulations, assembly welding between the elbow and the straight casing belongs to the supply category of equipment suppliers, the equipment suppliers need to send out construction teams to the field for assembly welding in the assembly stage, heat treatment and pressure resistance test are carried out on welding seams, and the market supervision departments in the sites of the suppliers need to send out personnel to the sites for supervision, inspection and acceptance of the whole process, sign certification documents, and form complete sets of record data together with the original product manufacturing process files in the manufacturing workshops of the equipment suppliers, so that the difficulty and the cost of the equipment suppliers are increased, and the contradiction is more prominent in remote overseas projects.

To sum up, in order to rapidly adapt to the market environment with a great demand for high-yield large-structure loop reactors in the current petrochemical new construction and extension, meet the capacity increasing, energy expanding and upgrading of the traditional loop reactor and the demand for high-yield of polypropylene with the capacity of more than 40 ten thousand tons/year, the development of the new-structure high-yield loop reactor and the integral supply and installation technology thereof has profound and important significance in industry and economy.

SUMMERY OF THE UTILITY MODEL

There is above-mentioned technical problem to prior art, the utility model provides a loop reactor with increase support convenient to axial-flow pump installation.

In order to achieve the above object, the utility model provides a following technical scheme:

the annular tube reactor with the height-adjustable support comprises a plurality of straight sleeves, a plurality of jacket communicating tubes, a plurality of elbows, a plurality of supporting ring seats and an axial flow pump, wherein each straight sleeve comprises an inner tube and an outer tube, the outer tube is sleeved outside the inner tube, the plurality of elbows are used for sequentially connecting the plurality of inner tubes and the axial flow pump in series, so that a communicating flow passage for conveying reaction materials is formed, and the axial flow pump is positioned at the elbow connected with the lower end of the straight sleeve; the jacket communicating pipe is positioned at the elbow and connected with the outer pipe, so that the space between the inner pipe and the outer pipe is connected in series to form another communicating flow channel for conveying a cooling medium; the plurality of supporting ring seats are respectively fixed on the outer sides of the plurality of outer pipes; the bottom of loop reactor is equipped with the assembly jig, and the assembly jig includes base, pillar and supporting shoe, and the base is used for holding axial-flow pump, and the pillar stands on the base, and the supporting shoe is fixed in the upper end of pillar in order to support corresponding a ring seat, and then makes the relative position of axial-flow pump and ring seat fix a position.

Preferably, the number of the pillars is more than two, and the supporting block at the upper end of each pillar supports different supporting ring seats.

Preferably, a reinforcing member is arranged between two adjacent pillars.

Preferably, the base is provided with a lifting lug.

Preferably, the assembly frame is of a cast steel structure or an assembly welding structure.

Preferably, a first concrete platform for installing the support ring seat is arranged on the outer side of the straight sleeve, a second concrete platform is arranged below the straight sleeve, and the base is installed on the second concrete platform.

Preferably, the number of the assembling brackets is two, and one assembling bracket is selected to position the relative positions of the axial flow pump and the support ring seat.

Preferably, the base is provided with an adjusting piece, and the adjusting piece is connected with the base to adjust the top surface of the base to be horizontal.

Preferably, the base is provided with an elastic pad which is pressed against the elbow or the axial flow pump upwards.

Preferably, the base is provided with stud holes, and the axial flow pump is provided with mounting holes aligned with the stud holes.

The utility model has the advantages that:

compared with the prior art, the utility model discloses a loop reactor with increase support is owing to set up the assembly jig and fixes a position the relative position of axial-flow pump with the supporting ring seat, consequently the supplier of parts such as the straight sleeve pipe of supply and return bend in the reality can be according to the location of assembly jig, reserve the position of assembly axial-flow pump in advance, and at the equipment scene, the assembly personnel can be according to the relative position of the base of assembly jig and supporting shoe, can carry out the centering to axial-flow pump and return bend in time fast and be connected, and play the supporting role to the axial-flow pump, more easy to assemble.

Drawings

FIG. 1 is a schematic diagram of the structure of a prior art loop reactor.

FIG. 2 is a schematic view showing the structural relationship between the jig and the loop reactor in the example.

Fig. 3 is a schematic structural view of one of the mounting brackets in the embodiment.

Fig. 4 is a schematic structural view of another jig in the embodiment.

FIG. 5 is a schematic view of the structure of the supporting block in the embodiment.

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-a stand for a supporting ring;

2A is a cooling medium inlet of the jacket flow passage, 2F is a cooling medium outlet of the jacket flow passage;

1A-reaction material inflow port, 1B-reaction material outflow port.

Fig. 2 to 5 include:

r1, R2, R3, R4, R5, R6-straight sleeve, R11-straight sleeve outlet extension section,

A1, A2, A3, B1, B2, B3-elbow,

d1, d2, d3, d4, d5, d 6-supporting ring seat,

a is a reactor feed inlet, b is a reactor discharge outlet,

g-axial flow pump,

w 1-axial flow pump and connecting elbow of reactor outlet,

w 2-connecting elbow of axial flow pump and reactor return port,

E1-lower concrete platform, E2-upper concrete platform.

T-assembly frame, T1-base, T2-adjusting piece, T3-pillar, T4-supporting block, T5-reinforcing piece, T6-lifting lug, T7-supporting block.

T41 skeleton, T42 reinforcing beam, T43 stud hole.

Detailed Description

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

Example 1

One of the embodiments of the loop reactor with height-adjustable support of the present invention, as shown in fig. 2 and 3, comprises a plurality of straight casing pipes (R1, R2, R3, R4, R5, R6), a plurality of jacketed communicating pipes, a plurality of elbows (a1, a2, A3, B1, B2, B3), a plurality of supporting ring holders (d1, d2, d3, d4, d5, d6) and an axial flow pump g, wherein each straight casing pipe comprises an inner pipe and an outer pipe, the outer pipe is jacketed outside the inner pipe, the plurality of elbows sequentially communicate the plurality of inner pipes and the axial flow pump g in series, thereby forming a communicating flow channel for conveying the reaction material, and the axial flow pump g is located between the elbows W1 and W2 connected to the lower ends of the straight casing pipes R1 and the straight casing pipe R6. The jacket communicating pipe is positioned at the elbow and connected with the outer pipe, so that the space between the inner pipe and the outer pipe is connected in series to form another communicating flow passage for conveying a cooling medium, wherein a is a reaction material inflow port, and b is a reaction material outflow port. The plurality of supporting ring seats are respectively fixed on the outer sides of the plurality of outer pipes. The above technical features are the same as the structure of the loop reactor in the prior art, and as an improvement, the bottom of the loop reactor in this embodiment is provided with an assembly frame T as a height-adjusting support, as shown in fig. 2, the assembly frame T includes a base T1, a support post T3 and a support block T4, the base T1 is used for supporting the axial flow pump g, the support post T3 stands on the base T1, and the support block T4 is fixed at the upper end of the support post T3 to support the corresponding support loop seat d1, so as to position the relative position of the axial flow pump g and the support loop seat d 1. The support block T4 is structured as shown in fig. 5, and includes a circular framework T41, a reinforcement beam T42, and a plurality of stud holes T43, wherein the reinforcement beam T42 is arranged in the framework T41 in a crossing manner, and the plurality of stud holes T43 are circumferentially distributed around the center of the framework T41.

In practice, a supplier who supplies components such as the straight casing and the elbow (except for the axial flow pump, which is delivered to an installation site by a separate supplier) can reserve a position for assembling the axial flow pump g in advance according to the positioning of the jig T, and the relative position between the reserved position and the branch ring seat d1 of the straight casing R1 is determined. On the assembly site, an assembly worker can quickly and timely perform centering connection on the axial flow pump g and the bent pipes w1 and w2 according to the relative position of the base T1 of the assembly frame T and the supporting block T4, the axial flow pump g is supported, and installation is facilitated.

The actual manufacturing process includes: firstly, according to the engineering technical requirements, shape and position deviations of an outlet flange and an inlet flange of an axial flow pump g and an elbow flange for connecting the two flanges are clearly marked in the detailed construction drawing design of the loop reactor, and shape and position deviations of bolt holes on the flanges are also clearly marked; secondly, two sets of mounting brackets T are designed according to the shape and position deviations, the base T1 and the supporting block T4 are respectively provided with a stud hole, the supporting ring seat d1 is provided with a mounting hole aligned with the stud hole T43 of the supporting block T4, and the axial flow pump g is provided with a mounting hole aligned with the stud hole on the base T1. All stud hole surface veneers are matched with drills for processing so as to ensure the azimuth precision of the stud holes; thirdly, the supporting block T4 is reinforced before drilling to ensure that the structure is firm and is not deformed any more after the residual stress is eliminated; fourthly, two sets of assembling frames T are provided, wherein one set of assembling frames T is used for assembling other workpieces except the axial flow pump g of the loop reactor at a supplier for manufacturing the straight sleeve and simulating and reserving the positioning position of the axial flow pump g; and the other set of assembly frame is delivered to a civil engineering and installation unit on the site of the device construction site, and is used for positioning and installing the axial flow pump g.

A first concrete platform E2 for mounting each support ring seat is arranged on the outer side of the straight sleeve, a second concrete platform E1 is arranged below the straight sleeve, and a base T1 is mounted on the second concrete platform E1. During assembly, a screw column hole of a base T1 of the assembly frame T is inserted into an anchor bolt before pouring of the second concrete platform E1 in advance to be combined with a nut for pre-locking, a screw column hole of a support ring seat of the straight sleeve is aligned with a screw column hole T43 of the support block T4 and inserted into an anchor bolt before pouring of the first concrete platform E2 to be combined with a nut for pre-locking, a mounting hole of the support block T4 is inserted, then concrete is poured to form the second concrete platform E1, and the base T1 is fixed on the second concrete platform E1. And then operating and positioning the axial flow pump g, installing the foundation studs of the base T1 through secondary pouring, pouring the first concrete platform E2, and fixing each support ring seat on the first concrete platform E2 through bolts and pouring concrete. It can be seen that the base T1 and support blocks T4 are secured by potting to a concrete platform which is not removable and which is later integrated with the reactor, and the post T3 may be cut off or concrete poured into the post T3 as a permanent structure to support the reactor, depending on the application. In practice, a protrusion or a groove for pre-positioning the axial flow pump g when initially placing the axial flow pump g may be provided on the top of the base T1.

The loop reactor is accurately installed by means of an assembly jig T previously buried in reinforced concrete E1. The support ring seat d1 on the straight sleeve R1 in fig. 2 is mounted on the support block T4 in the mounting bracket block T. The axial flow pump g is mounted on a mount T1 in the mounting bracket T. In the initial installation stage, elbows W1 and W2 with flanges are firstly installed, and the gap between the flange at the end part of the elbows and the flange matched with the axial-flow pump g is preliminarily judged; finely adjusting the outlet direction of the axial flow pump g according to the clearance, and reserving the axial displacement required when an outlet flange of the axial flow pump g is fastened with an elbow flange; the elbow W1 was then fastened to the flange at the lower end of the inner pipe of the straight casing R1, and the flange of the elbow W2 was fastened to the flange at the lower end of the inner pipe of the straight casing R6. According to the field condition, an elastic cushion is additionally arranged below the axial flow pump g and is propped against the elbows W1, W2 or the axial flow pump g upwards when necessary, so that the vibration caused by the axial flow pump g in the operation process is relieved.

In this embodiment, base T1 is provided with lug T6 to guarantee to lift by crane the process atress balanced, avoid the steel construction to warp.

In this embodiment, the base T1 is provided with a regulating piece T2, the regulating piece T2 is connected with the base T1 to regulate the top surface of the base T1 to the horizontal, and further ensure the positioning accuracy of the axial flow pump g, and the regulating piece T2 may be configured in various ways such as a pad plate.

In this embodiment, the assembly frame T is a cast steel structure or an assembly welding structure, and the steel structure of the assembly frame T is subjected to a heat treatment or other processes to relieve residual stress so as to prevent gradual deformation caused by gradual release of stress.

Example 2

The second embodiment of the loop reactor with the height-adjustable support of the present invention is that the main technical solution of the present embodiment is the same as that of embodiment 1, and the unexplained features in the present embodiment adopt the explanation of embodiment 1, which is not repeated herein. This example differs from example 1 in that: as shown in fig. 4, the number of the support columns T3 is two, the support block T4 at the upper end of each support column T3 supports a different support ring seat, the higher support block T7 directly positions the support ring seat d1 of the feeding straight casing R1, and the lower support block T4 indirectly positions the support ring seat d6 of the straight casing R6 through the straight casing outlet lengthened section R11. A reinforcing member T5 is provided between two adjacent struts T3. Of course, in practice, the number of the struts T3 may be changed to another number, such as the struts T3 corresponding to the straight sleeves.

It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. A loop reactor with a height-adjustable support comprises a plurality of straight sleeves, a plurality of jacket communicating pipes, a plurality of elbows, a plurality of support ring seats and an axial flow pump, wherein each straight sleeve comprises an inner pipe and an outer pipe, the outer pipe is sleeved outside the inner pipe, the plurality of elbows are used for sequentially connecting the inner pipes and the axial flow pump in series, so that a communicating flow passage for conveying reaction materials is formed, and the axial flow pump is positioned at the elbow connected with the lower end of the straight sleeve; the jacket communicating pipe is positioned at the elbow and connected with the outer pipe, so that the space between the inner pipe and the outer pipe is connected in series to form another communicating flow channel for conveying a cooling medium; the plurality of supporting ring seats are respectively fixed on the outer sides of the plurality of outer pipes; the method is characterized in that: the bottom of the loop reactor is provided with an assembly jig, the assembly jig comprises a base, a support column and a support block, the base is used for supporting the axial-flow pump, the support column is erected on the base, the support block is fixed at the upper end part of the support column so as to support a corresponding loop base, and then the relative position of the axial-flow pump and the loop base is positioned.

2. A loop reactor with height-adjustable supports according to claim 1, characterized in that: the number of the support columns is more than two, and the support block at the upper end part of each support column supports different support ring seats.

3. A loop reactor with height-adjustable supports according to claim 2, characterized in that: and a reinforcing piece is arranged between every two adjacent pillars.

4. A loop reactor with height-adjustable supports according to claim 1, characterized in that: the base is provided with the lug.

5. A loop reactor with height-adjustable supports according to claim 1, characterized in that: the assembly frame is integrally of a cast steel structure or an assembly welding structure.

6. A loop reactor with height-adjustable supports according to claim 1, characterized in that: the outer side of the straight sleeve is provided with a first concrete platform for installing the supporting ring seat, the lower side of the straight sleeve is provided with a second concrete platform, and the base is installed on the second concrete platform.

7. A loop reactor with height-adjustable supports according to claim 1, characterized in that: the number of the assembling frames is two, and one assembling frame is selected to position the relative positions of the axial flow pump and the support ring seat.

8. A loop reactor with height-adjustable supports according to claim 1, characterized in that: the base is provided with the regulating part, and the regulating part is connected with the base to the top surface to the level of adjusting the base.

9. A loop reactor with height-adjustable supports according to claim 1, characterized in that: the base is provided with an elastic pad which is propped against the elbow or the axial flow pump upwards.

10. A loop reactor with height-adjustable supports according to claim 1, characterized in that: the base is provided with stud holes, and the axial-flow pump is provided with the mounting hole of stud hole alignment.

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