CN115121185B

CN115121185B - UOP propane dehydrogenation device reactor and overhauling method thereof

Info

Publication number: CN115121185B
Application number: CN202210870031.7A
Authority: CN
Inventors: 丁龙; 占德庆; 纪擘
Original assignee: China National Chemical Engineering Third Construction Co Ltd
Current assignee: China National Chemical Engineering Third Construction Co Ltd
Priority date: 2022-07-22
Filing date: 2022-07-22
Publication date: 2023-09-15
Anticipated expiration: 2042-07-22
Also published as: CN115121185A

Abstract

The application belongs to the technical field of dehydrogenation device reactors, and particularly relates to a UOP propane dehydrogenation device reactor and an overhaul method thereof. According to the application, through the integral design of the inner net, the outer net and the lower cover plate, the integral hanging is convenient, the workers can be prevented from being lowered into the narrow reactor to detach the bolts, and the personnel injury is avoided.

Description

UOP propane dehydrogenation device reactor and overhauling method thereof

Technical Field

The application belongs to the technical field of dehydrogenation device reactors, and particularly relates to a UOP propane dehydrogenation device reactor and an overhaul method thereof.

Background

Dehydrogenation of organic compounds in the presence of a catalyst or dehydrogenation agent at elevated temperature is a form of oxidation reaction, and a propane dehydrogenation reactor is a production facility for the dehydrogenation of propane.

The propane dehydrogenation reactor is large in volume and heavy in mass, and comprises a reduction section, a catalytic section and a feeding bent pipe, wherein the catalytic section comprises an inner net, an outer net and a conical distributor, and the catalytic section is required to be hoisted in the installation and overhaul processes. The problem that the inner net and the outer net are easily shifted in the process of overhauling and hoisting is solved, the hoisting safety is greatly reduced, the inner net and the outer net are respectively dismantled when the inner net is dismantled, a person carrying tray is needed to be taken when the inner net is dismantled, the inner net is placed in the bottom of the reactor, and the connecting bolts of the inner net and the outer net are dismantled; when the outer net is dismantled, the equipment shell layer and the outer net interlayer need to be accessed; however, when the inner and outer nets are arranged in the reactor, the movable space is very narrow, workers are inconvenient to operate, the air at the bottom of the reactor cannot circulate due to the existence of the inner and outer nets, and the gas which is unfavorable for the human body still remains at the bottom of the reactor, so that the workers enter the reactor, and a certain danger is caused. Therefore, a UOP propane dehydrogenation device reactor and an overhaul method thereof are provided.

Disclosure of Invention

In order to solve the problems, a primary object of the present application is to provide a UOP propane dehydrogenation unit reactor and a maintenance method thereof.

The above object is achieved by the following preparation process:

a UOP propane dehydrogenation unit reactor comprising:

the reduction cylinder, the catalytic cylinder and the feeding bent pipe are connected through the sealing flange, the feeding bent pipe is positioned at the lower end of the catalytic cylinder, the catalytic cylinder is internally positioned at the same axis and is sequentially provided with a conical distributor, an inner net and an outer net from inside to outside, the upper ends of the conical distributor, the inner net and the outer net are connected with an upper cover plate through bolt gaskets,

the lower extreme of intranet and outer net is all through connecting bolt and lower apron connection, movable mounting has the expansion joint structure between the lower extreme of lower apron and the inner wall of catalytic cylinder bottom, be equipped with the toper changeover portion between the feed inlet of intranet and feeding return bend.

As a further improvement of the technical scheme, the two ends of the upper cover plate between the inner net and the outer net are respectively provided with an upper catalyst conveying pipe in a penetrating way, and the lower ends of the two sides of the lower cover plate between the inner net and the outer net are respectively provided with a lower catalyst conveying pipe.

As a further improvement of the technical scheme, the lower end of the catalytic cylinder is provided with a limit sleeve sleeved on the lower catalyst conveying pipe.

As a further improvement of the technical scheme, a central purging pipe extending to the inner bottom of the conical distributor is arranged at the axis of the upper cover plate positioned at the upper end of the conical distributor, and the central purging pipe positioned above the upper cover plate extends to the outside of the reduction cylinder through a right-angle pipe.

As a further improvement of the technical scheme, the lower cover plate is annular, the bottom end of the lower cover plate is flush with the bottom ends of the inner net and the outer net, and connecting bolts between the inner net and the outer net and the lower cover plate are respectively positioned on one sides of the inner net and the outer net.

As the further improvement of above-mentioned technical scheme, expansion joint structure includes lower extreme body coupling and has outer crown plate and the interior crown plate of difference in height, be equipped with outer expansion portion on the outer crown plate vertical direction, be equipped with interior expansion portion on the interior crown plate vertical direction, be equipped with the go-between the upper end flush department and the outer crown plate of interior crown plate, the top inboard of interior crown plate is with toper changeover portion assorted inclined plane, and is equipped with on the outer crown plate outer wall to be used for the gliding spout of go-between, the upper end of outer crown plate and interior crown plate bottom body coupling department is equipped with the screw rod that extends to the go-between top, and the screw rod head is equipped with the bolt.

As a further improvement of the technical scheme, the upper end of the outer ring plate is provided with a clamping groove, the bottom end of the lower cover plate is connected with the clamping groove through a sealing clamping ring, and the sealing clamping ring is made of a thermal expansion and contraction material.

As a further improvement of the technical scheme, an evenly distributed anti-deformation rod is arranged in the vertical direction between the inner net and the outer net, one end of the anti-deformation rod is fixed on the outer net, the other end of the anti-deformation rod is connected with a wedge block with an inclined surface at the upper end through an elastic telescopic rod and a connecting rod, and a wedge groove matched with the wedge block is formed in the outer wall of the inner net.

The overhaul method of the UOP propane dehydrogenation device reactor comprises the following steps:

(1) And (3) injecting neutralizing liquid into the reactor for neutralization, discharging the neutralizing liquid for cooling, and removing structures, pipelines, electric heaters and instrument parts, wherein the structures, the pipelines, the electric heaters and the instrument parts prevent the lifting of the internal parts, on the upper part of the reactor.

(2) Lifting and removing the reduction cylinder, removing an upper cover plate connected with the conical distributor, the inner net and the outer net, paving color stripe cloth on a steel grid of the conical distributor, preventing a dismantling tool and screws from falling into the distributor, and then lifting and removing the conical distributor;

(3) Removing the connection relation between the feeding bent pipe and the catalytic cylinder, protecting the connecting flange by black rubber, and simultaneously operating by using 3 chain blocks to vertically and slowly drop the bent pipe to a proper position;

(4) Marking on lifting lugs of the inner net and the outer net and the cylinder, integrally lifting the inner net, the outer net and the lower cover plate, and removing the inner net, the outer net and the lower cover plate on one hand and sending workers to the bottom of the cylinder to overhaul the expansion joint structure on the other hand;

(5) After cleaning and overhauling the components of the reactor, the components are sequentially reinstalled according to the dismantling sequence.

The application has the beneficial effects that:

(1) Through the holistic design of intranet, outer net and lower apron, be convenient for wholly hang out, can avoid the workman to drop narrow and small inside dismantlement bolt of reactor, avoid personnel to be injured.

(2) Through the design of intranet, outer net, anti-deformation pole isotructure, can prevent intranet, outer net distortion moreover after hanging out, after relieving the connecting bolt of intranet, can make the intranet separate from outer net owing to the dead weight slowly.

(3) Through the expansion joint structure, when in use, on one hand, the transverse displacement and the axial displacement of the inner net and the outer net are compensated, and on the other hand, the stability is improved in order to prevent deformation or damage caused by thermal extension or temperature stress when the conical transition section is heated; and after the inner net, the outer net and the lower cover plate are integrally dismantled, the expansion joint can be prevented from bouncing up due to the design of the screw rod, the outer ring plate and the inner ring plate, so that the problem that the outer net cannot be assembled again is avoided.

Drawings

FIG. 1 is a schematic diagram of the internal structure of a UOP propane dehydrogenation unit reactor of the present application;

FIG. 2 is a schematic diagram of the bottom structure of the UOP propane dehydrogenation unit reactor of the present application;

FIG. 3 is a schematic illustration of the connection of the inner and outer net of the UOP propane dehydrogenation unit reactor of the present application.

The diagram is: 1. a catalytic cartridge; 2. a reduction cylinder; 3. a conical distributor; 4. an intranet; 5. an outer net; 61. an upper catalyst transfer tube; 62. a lower catalyst transfer tube; 7. a feed elbow; 8. an expansion joint structure; 81. an outer ring plate; 82. an inner ring plate; 83. an outer expansion portion; 84. an inner expansion section; 85. a screw; 86. a chute; 9. a central purge tube; 10. a lower cover plate; 11. a sealing clasp; 12. a connecting bolt; 13. an anti-deformation rod; 14. wedge blocks; 15. wedge grooves; 16. a connecting rod; 17. an elastic telescopic rod; 18. a conical transition section.

Detailed Description

The present application will be described in further detail with reference to the accompanying drawings, wherein it is to be understood that the following detailed description is for the purpose of further illustrating the application only and is not to be construed as limiting the scope of the application, as various insubstantial modifications and adaptations of the application to those skilled in the art can be made in light of the foregoing disclosure.

As shown in fig. 1 to 3, the UOP propane dehydrogenation unit reactor of the present embodiment includes:

the catalytic tube 1 is characterized in that the reducing tube 2 and the catalytic tube 1 which are connected end to end through the sealing flange and the feeding bent tube 7 which is positioned at the lower end of the catalytic tube 1 are provided with small expansion joints around the feeding bent tube 7, the catalytic tube 1 is positioned on the same axis and is sequentially provided with the conical distributor 3, the inner net 4 and the outer net 5 from inside to outside, the conical distributor 3, the inner net 4 and the upper end of the outer net 5 are connected with an upper cover plate through bolt gaskets, the lower ends of the inner net 4 and the outer net 5 are connected with a lower cover plate 10 through connecting bolts 12, the lower cover plate 10 is annular, the bottom ends of the inner net 4 and the outer net 5 are flush with the bottom ends of the inner net 4, the connecting bolts 12 between the inner net 4 and the outer net 5 and the lower cover plate 10 are respectively positioned on one side of the inner net 4 and the outer net 5, after the inner net, the outer net and the lower cover plate are integrally hung out, the connecting bolts 12 are conveniently dismantled by workers, an expansion joint structure 8 is movably arranged between the lower end of the lower cover plate 10 and the inner wall of the bottom end of the catalytic tube 1, and a feeding port of the inner tube 7 is provided with a conical transition section 18.

The upper cover plate two ends that are located between intranet 4 and outer net 5 all run through and are equipped with upper portion catalyst conveyer pipe 61, and the lower cover plate 10 both sides lower extreme that is located between intranet 4 and outer net 5 all is equipped with lower catalyst conveyer pipe 62, and wherein, lower catalyst conveyer pipe 62 also can pass lower cover plate 10 and outer net 5 bottom fixed connection, is equipped with around the feeding return bend 7 of catalytic cylinder 1 lower extreme and cup joints the spacing sleeve of lower catalyst conveyer pipe 62, and lower catalyst conveyer pipe 62 is equipped with little expansion joint with spacing sheathed tube external connection department, and after intranet, outer net and lower cover plate wholly hung out, lower catalyst conveyer pipe 62 was hung out simultaneously.

The central purging pipe 9 extending to the inner bottom of the conical distributor 3 is arranged at the axis of the upper cover plate positioned at the upper end of the conical distributor 3, the central purging pipe 9 positioned above the upper cover plate extends to the outside of the reduction cylinder 2 through a right-angle pipe, and the central purging pipe 9 and the right-angle pipe are connected through a flange.

The expansion joint structure 8 comprises an outer ring plate 81 and an inner ring plate 82 which are integrally connected at the lower end and have a height difference, an outer expansion part 83 is arranged on the vertical direction of the outer ring plate 81, the inner side of the top end of the inner ring plate 82 is provided with an inclined plane matched with the conical transition section 18, the outer ring plate 81 and the outer expansion part 83 compensate the transverse and axial displacement of an inner net and an outer net, an inner expansion part 84 is arranged on the vertical direction of the inner ring plate 82, the inclined plane at the top end of the inner ring plate 82 and the inner expansion part 84 are matched to prevent deformation or damage caused by thermal elongation or temperature stress when the conical transition section 18 is heated, the stability is improved, a connecting ring is arranged between the upper end flush position of the inner ring plate 82 and the outer ring plate 81, a sliding chute 86 for connecting ring sliding is arranged on the outer wall of the outer ring plate 81, a screw rod 85 extending to the upper side of the connecting ring is arranged at the upper end of the integral joint of the bottom end of the outer ring plate 81 and the inner ring plate 82, the head of the screw rod 85 is provided with bolts, the conical transition sections 18 with different specifications are convenient to adapt to the inner ring plate 82 when the inner ring plate 82 is installed, and the elastic tension of the expansion joint can be prevented from being lost after the inner ring is removed by the fixed connection of the screw rod 85 and the connecting ring.

The upper end of outer annular plate 81 is equipped with the draw-in groove, and the bottom of lower apron 10 is connected with the draw-in groove through sealing snap ring 11, and the connected mode is simple easily demolishd, and sealing snap ring 11 adopts expend with heat and contract with cold material to make, increases the leakproofness of reaction.

The vertical direction between intranet 4 and outer net 5 is equipped with evenly distributed's shape pole 13 of preapring for an unfavorable turn of events, shape pole 13 one end is fixed on outer net 5, the other end is connected with wedge 14 that the upper end was equipped with the inclined plane through elastic telescopic rod 17 and connecting rod 16, the intranet 4 outer wall is equipped with wedge 14 assorted wedge groove 15, can prevent intranet 4, outer net 5 distortion, and after lifting out, remove the connecting bolt 12 of intranet 4 after can making intranet 4 slowly separate from outer net 5 owing to the dead weight, specifically, after removing connecting bolt 12 of intranet 4, intranet 4 falls owing to the dead weight, but can receive the blocking of wedge 14 again owing to wedge 14 has the inclined plane, at the time of falling, nevertheless can receive the blocking, at the time of returning, hoist into outer net 5 from last intranet 4 earlier, after to the groove, because of the dead weight, intranet 4 is direct corresponds with outer net 5.

The overhauling method of the propane dehydrogenation device reactor of the embodiment comprises the following steps:

(2) Lifting and removing the reduction cylinder 2, removing an upper cover plate connected with the conical distributor 3, the inner net 4 and the outer net 5, paving color stripe cloth on a steel grid of the conical distributor 3, preventing a dismantling tool and screws from falling into the distributor, and then lifting and removing the conical distributor 3;

(3) Removing the connection relation between the feeding bent pipe 7 and the catalytic cylinder 1, protecting the connection flange by black rubber, and simultaneously operating by using 3 chain blocks to vertically and slowly drop the bent pipe to a proper position;

(4) Marking on lifting lugs and cylinders of the inner net 4 and the outer net 5, then integrally lifting the inner net 4, the outer net 5 and the lower cover plate 10, dismantling the inner net 4, the outer net 5 and the lower cover plate 10 after lifting, removing connecting bolts 12 between the inner net 4, the outer net 5 and the lower cover plate 10, removing the lower cover plate 10, and allowing the inner net 4 to fall due to self weight, but being blocked by the wedge block 14, and allowing the wedge block 14 to have an inclined plane, and the elastic telescopic rod 17 to stretch, wherein during falling, the inner net 4 is blocked but does not prevent falling, so that the falling speed can be slowed down, and allowing workers to fall to the bottom of the cylinder body after removing the inner net and the outer net to overhaul the expansion joint structure 8;

(5) After cleaning and overhauling the components of the reactor, sequentially carrying out reinstallation according to the dismantling sequence, wherein when the inner and outer nets are reinstalled, the inner net 4 is firstly hoisted into the outer net 5 from the top, and after the groove is well formed, the inner net 4 directly corresponds to the outer net 5 due to the dead weight.

The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that modifications can be made without departing from the spirit of the application, which are within the scope of the application.

Claims

1. A UOP propane dehydrogenation unit reactor comprising:

the catalytic device comprises a reduction cylinder (2), a catalytic cylinder (1) and a feeding bent pipe (7) which are connected through a sealing flange, wherein the feeding bent pipe (7) is positioned at the lower end of the catalytic cylinder (1), the catalytic cylinder (1) is positioned in the same axis, a conical distributor (3), an inner net (4) and an outer net (5) are sequentially arranged from inside to outside, and the upper ends of the conical distributor (3), the inner net (4) and the outer net (5) are connected with an upper cover plate through bolt gaskets;

the lower ends of the inner net (4) and the outer net (5) are connected with a lower cover plate (10) through connecting bolts (12), an expansion joint structure (8) is movably arranged between the lower end of the lower cover plate (10) and the inner wall of the bottom end of the catalytic cylinder (1), and a conical transition section (18) is arranged between the inner net (4) and a feed inlet of the feed elbow (7);

the expansion joint structure (8) comprises an outer ring plate (81) and an inner ring plate (82) which are integrally connected with each other at the lower end and have a height difference, an outer expansion part (83) is arranged on the outer ring plate (81) in the vertical direction, an inner expansion part (84) is arranged on the inner ring plate (82) in the vertical direction, the inner side of the top end of the inner ring plate (82) is an inclined surface matched with the conical transition section (18), a connecting ring is arranged between the upper end flush position of the inner ring plate (82) and the outer ring plate (81), a sliding chute (86) for sliding the connecting ring is arranged on the outer wall of the outer ring plate (81), a screw rod (85) extending to the upper part of the connecting ring is arranged at the upper end of the integral joint of the bottom end of the outer ring plate (81) and the inner ring plate (82), and a bolt is arranged at the head of the screw rod (85);

the upper end of the outer ring plate (81) is provided with a clamping groove, the bottom end of the lower cover plate (10) is connected with the clamping groove through a sealing clamping ring (11), and the sealing clamping ring (11) is made of a thermal expansion and contraction material;

the anti-deformation device is characterized in that anti-deformation rods (13) which are uniformly distributed are arranged between the inner net (4) and the outer net (5) in the vertical direction, one end of each anti-deformation rod (13) is fixed on the outer net (5), the other end of each anti-deformation rod is connected with a wedge block (14) with an inclined surface at the upper end through an elastic telescopic rod (17) and a connecting rod (16), and wedge grooves (15) matched with the wedge blocks (14) are formed in the outer wall of the inner net (4); after the inner net (4), the outer net (5) and the lower cover plate (10) are integrally lifted out, connecting bolts (12) between the inner net (4) and the outer net (5) and the lower cover plate (10) are removed, the inner net (4), the outer net (5) and the lower cover plate (10) are removed, the lower cover plate (10) is removed, the inner net (4) falls down due to self weight and can be blocked by the wedge block (14), and the wedge block (14) has an inclined plane, and the elastic telescopic rod (17) acts in a telescopic manner, so that the falling speed of the inner net (4) is slowed down when the inner net falls down.

2. The UOP propane dehydrogenation device reactor according to claim 1 wherein the upper cover plate between the inner net (4) and the outer net (5) is provided with upper catalyst delivery pipes (61) at both ends thereof, and the lower cover plate (10) between the inner net (4) and the outer net (5) is provided with lower catalyst delivery pipes (62) at both lower ends thereof.

3. UOP propane dehydrogenation unit reactor according to claim 2 characterized in that the lower end of the catalytic cartridge (1) is provided with a limit sleeve sleeved on the lower catalyst delivery tube (62).

4. UOP propane dehydrogenation unit reactor according to claim 1 characterized in that the upper cover plate axis at the upper end of the conical distributor (3) is provided with a central purge tube (9) extending to the inner bottom of the conical distributor (3), said central purge tube (9) above the upper cover plate extending outside the reduction cylinder (2) through a right angle tube.

5. UOP propane dehydrogenation unit reactor according to claim 1 characterized in that the lower cover plate (10) is ring-shaped and the bottom end is flush with the inner net (4) and the outer net (5) bottom end, the connecting bolts (12) between the inner net (4) and the outer net (5) and the lower cover plate (10) are located at one side of the inner net (4) and the outer net (5) respectively.

6. A method of servicing a UOP propane dehydrogenation unit reactor as set forth in any one of claims 1-5 comprising the steps of:

(1) The neutralizing liquid is injected into the reactor for neutralization, and then discharged for cooling, and the structure, the pipeline, the electric heater and the instrument parts which are arranged at the upper part of the reactor and prevent the hoisting of the internal parts are removed;

(2) Removing the connection relation between the reduction cylinder (2) and the catalytic cylinder (1), lifting the reduction cylinder (2) out, removing an upper cover plate connected with the conical distributor (3), the inner net (4) and the outer net (5), paving color stripe cloth on a steel grid of the conical distributor (3), preventing a dismantling tool and screws from falling into the distributor, and lifting the conical distributor (3) out;

(3) Removing the connection relation between the feeding bent pipe (7) and the catalytic cylinder (1), protecting the connecting flange by black rubber, and then enabling the bent pipe to vertically and slowly fall to a proper position by utilizing 3 chain blocks to simultaneously operate;

(4) Marking the lifting lugs of the inner net (4) and the outer net (5) and the catalytic cylinder body, then integrally lifting the inner net (4), the outer net (5) and the lower cover plate (10), and after lifting, dismantling the inner net (4), the outer net (5) and the lower cover plate (10) on one hand, and sending workers to lower the catalytic cylinder body to overhaul the expansion joint structure (8);