CN115121185A

CN115121185A - UOP propane dehydrogenation device reactor and maintenance method thereof

Info

Publication number: CN115121185A
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: 2022-09-30
Anticipated expiration: 2042-07-22
Also published as: CN115121185B

Abstract

The invention belongs to the technical field of dehydrogenation device reactors, and particularly relates to a UOP propane dehydrogenation device reactor and an overhauling method thereof. According to the invention, through the integral design of the inner net, the outer net and the lower cover plate, the integral lifting is convenient, workers can be prevented from lowering into the narrow reactor to remove bolts, and the personnel are prevented from being injured.

Description

UOP propane dehydrogenation device reactor and maintenance method thereof

Technical Field

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

Background

Dehydrogenation of organic compounds at high temperatures and in the presence of catalysts or dehydrogenating agents is a form of oxidation, and propane dehydrogenation reactors are production facilities for propane dehydrogenation.

Most propane dehydrogenation reactors are large in size and heavy in mass, and comprise a reduction section, a catalysis section and a feeding bent pipe, wherein the catalysis section comprises an inner net, an outer net and a conical distributor, and the propane dehydrogenation reactors are hoisted in the installation and maintenance process. The problem of displacement of the inner net and the outer net is very easy to occur in the process of overhauling and hoisting, the hoisting safety is greatly reduced, when the inner net and the outer net are disassembled and overhauled, the inner net is required to take a manned tray when being disassembled, the inner net is required to be placed to the bottom in the reactor, and the connecting bolts of the inner net and the outer net are disassembled; when the outer net is dismantled, the outer net needs to enter an equipment shell layer and an outer net interlayer; but when the inside intranet and extranet that exists of reactor, the activity space is very narrow and small, and the workman is not convenient for operate, and the existence of intranet and extranet can lead to reactor bottom air not to circulate, and the reactor bottom still remains the gas that is unfavorable for the human body moreover, and the workman gets into inside the reactor, has certain danger. Therefore, a UOP propane dehydrogenation unit reactor and a maintenance method thereof are provided.

Disclosure of Invention

In order to solve the above problems, a primary object of the present invention is to provide a UOP propane dehydrogenation unit reactor and a method of repairing the same.

The above object is achieved by the following preparation process:

a UOP propane dehydrogenation unit reactor comprising:

a reduction cylinder and a catalysis cylinder which are connected through a sealing flange, and a feeding bent pipe which is positioned at the lower end of the catalysis cylinder, wherein the interior of the catalysis cylinder is positioned on 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 all connected with an upper cover plate through bolt gaskets,

the lower extreme of intranet and outer net all passes through connecting bolt and lower cover connection, movable mounting has the expansion joint structure between the lower extreme of lower cover plate and the catalysis section of thick bamboo bottom inner wall, 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, two ends of an upper cover plate positioned 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 two sides of a lower cover plate positioned 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 limiting sleeve which is 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 an 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 between the lower cover plate and the outer net are respectively positioned on one sides of the inner net and one side of the outer net.

As a further improvement of the above technical scheme, the expansion joint structure comprises an outer ring plate and an inner ring plate which are integrally connected at the lower ends and have a height difference, an outer expansion part is arranged in the vertical direction of the outer ring plate, an inner expansion part is arranged in the vertical direction of the inner ring plate, a connecting ring is arranged between the upper end leveling part of the inner ring plate and the outer ring plate, the inner side of the top end of the inner ring plate is an inclined plane matched with the conical transition section, a sliding groove for sliding the connecting ring is formed in the outer wall of the outer ring plate, a screw rod extending to the upper side of the connecting ring is arranged at the upper end of the integral connection position of the bottom ends of the outer ring plate and the inner ring plate, and a bolt is arranged at the head of the screw rod.

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 material with thermal expansion and cold contraction.

As the further improvement of the technical scheme, the vertical direction is equipped with evenly distributed's the deformation pole of preapring for an unfavorable turn of events between intranet and the outer net, preapring for an unfavorable turn of events shape pole one end is fixed on the outer net, and the other end is connected with the voussoir that the upper end was equipped with the inclined plane through elastic telescopic rod and connecting rod, the intranet outer wall be equipped with voussoir assorted wedge groove.

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

(1) and (4) injecting neutralizing liquid into the reactor, neutralizing, then discharging the neutralizing liquid, cooling, and dismantling the structure, the pipeline, the electric heater and the instrument components, which obstruct the hoisting of the internal components, on the upper part of the reactor.

(2) Lifting and moving out the reduction cylinder, removing an upper cover plate connected with the conical distributor, the inner net and the outer net, laying color strip cloth on a steel grating of the conical distributor to prevent a removing tool and screws from falling into the distributor, and then lifting and moving out the conical distributor;

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

(4) marks are made on the lifting lugs of the inner net and the outer net and the barrel, then the inner net, the outer net and the lower cover plate are integrally lifted out, after the lifting out, the inner net, the outer net and the lower cover plate are removed, and a worker is placed at the bottom of the barrel to overhaul the expansion joint structure;

(5) after cleaning and overhauling the components of the reactor, sequentially reloading the components according to the dismantling sequence.

The invention has the beneficial effects that:

(1) through intranet, outer net and the holistic design of apron down, the whole of being convenient for is hung out, can avoid the workman to transfer narrow and small reactor inside and demolish the bolt, avoids personnel injured.

(2) Through the design of intranet, outer net, prevent deformation pole isotructure, can prevent that intranet, outer net distortion from, hang out the back moreover, remove the connecting bolt of intranet after, can make the intranet because the separation of outer net is slowly followed to the dead weight.

(3) By the arranged expansion joint structure, when in use, the transverse and axial displacements of the inner net and the outer net are compensated, and the stability is improved in order to prevent deformation or damage caused by thermal elongation or temperature stress when the temperature of the conical transition section is raised; and after the inner net, the outer net and the lower cover plate are integrally removed, the expansion joint can be prevented from bouncing due to the design of the screw, the outer ring plate and the inner ring plate, and the problem that the outer net cannot be installed back is avoided.

Drawings

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

FIG. 2 is a schematic bottom view of a reactor of a UOP propane dehydrogenation unit of the present invention;

FIG. 3 is a schematic representation of the internal and external grid connections of a reactor of a UOP propane dehydrogenation unit of the present invention.

The figure is as follows: 1. a catalytic cartridge; 2. a reduction cylinder; 3. a conical distributor; 4. an inner net; 5. an outer net; 61. an upper catalyst transfer pipe; 62. a lower catalyst transfer pipe; 7. feeding a bent pipe; 8. an expansion joint structure; 81. an outer ring plate; 82. an inner ring plate; 83. an outer expansion portion; 84. an inner expansion part; 85. a screw; 86. a chute; 9. a central purge tube; 10. a lower cover plate; 11. sealing the snap ring; 12. a connecting bolt; 13. an anti-deformation rod; 14. a wedge block; 15. a wedge groove; 16. a connecting rod; 17. an elastic telescopic rod; 18. a tapered transition section.

Detailed Description

The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.

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

the device comprises a reduction cylinder 2, a catalysis cylinder 1 and a feeding bent pipe 7, wherein the reduction cylinder 2 and the catalysis cylinder 1 are connected with each other end to end through sealing flanges, the feeding bent pipe 7 is positioned at the lower end of the catalysis cylinder 1, small expansion joints are arranged around the feeding bent pipe 7, the catalysis cylinder 1 is positioned in the same axis and is sequentially provided with a conical distributor 3, an inner net 4 and an outer net 5 from inside to outside, 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, the lower cover plate 10 is annular, the bottom ends of the lower cover plate are flush with the bottom ends of the inner net 4 and the outer net 5, the connecting bolts 12 between the inner net 4 and the outer net 5 and the lower cover plate 10 are respectively positioned at 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 lifted out, workers can conveniently remove the 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 catalysis cylinder 1, a conical transition section 18 is arranged between the inner net 4 and the feeding hole of the feeding bent pipe 7.

Be located the upper cover plate both ends between intranet 4 and the outer net 5 and all run through and be equipped with upper portion catalyst conveyer pipe 61, the lower apron 10 both sides lower extreme that is located between intranet 4 and the outer net 5 all is equipped with lower part catalyst conveyer pipe 62, wherein, lower part catalyst conveyer pipe 62 also can pass apron 10 and the 5 bottom fixed connection of outer net down, be equipped with the stop collar who cup joints at lower part catalyst conveyer pipe 62 around the 1 lower extreme feeding return bend 7 of catalysis section of thick bamboo, lower part catalyst conveyer pipe 62 is equipped with little expansion joint with stop collar's external connection department, at the intranet, the whole back of hanging out of outer net and lower apron, lower part catalyst conveyer pipe 62 is hung out simultaneously.

The axis of the upper cover plate positioned at the upper end of the conical distributor 3 is provided with a central purging pipe 9 extending to the bottom in 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 flanges.

The expansion joint structure 8 comprises an outer ring plate 81 and an inner ring plate 82 which are integrally connected at the lower ends and have a height difference, an outer expansion part 83 is arranged on the outer ring plate 81 in the vertical direction, the inner side of the top end of the inner ring plate 82 is 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 the inner net and the outer net, an inner expansion part 84 is arranged on the inner ring plate 82 in the vertical direction, the inclined plane at the top end of the inner ring plate 82 and the inner expansion part 84 are matched to prevent the conical transition section 18 from being deformed or damaged due to thermal extension or temperature stress when the temperature rises, the stability is improved, a connecting ring is arranged between the upper end leveling position of the inner ring plate 82 and the outer ring plate 81, a sliding groove 86 for the connecting ring to slide is arranged on the outer wall of the outer ring plate 81, a screw rod 85 extending above the connecting ring is arranged at the upper end of the integral connection position of the bottom ends of the outer ring plate 81 and the inner ring plate 82, a bolt is arranged at the head of the screw rod 85, during installation, the adaptation degree of the conical transition sections 18 with different specifications and the inner ring plate 82 is facilitated, and the expansion joint can be prevented from losing gravity and bouncing after the inner net and the outer net are disassembled through the fixed connection of the screw rod 85 and the connecting ring, and the expansion joint can be prevented from being pulled by the expansion joint.

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

The anti-deformation rods 13 are uniformly distributed in the vertical direction between the inner net 4 and the outer net 5, one end of each anti-deformation rod 13 is fixed on the outer net 5, the other end of each anti-deformation rod 13 is connected with a wedge block 14 with an inclined plane at the upper end through an elastic telescopic rod 17 and a connecting rod 16, the outer wall of the inner net 4 is provided with a wedge groove 15 matched with the wedge block 14, so that the inner net 4 and the outer net 5 can be prevented from being distorted and deformed, and after being lifted out, the inner net 4 can be slowly separated from the outer net 5 by its own weight after the connecting bolts 12 of the inner net 4 are released, and, in particular, when the connecting bolts 12 of the inner net 4 are released, the inner net 4 falls down by its own weight, but is simultaneously stopped by the wedges 14, and since the wedges 14 have inclined surfaces, when the inner net 4 is lifted from above into the outer net 5, the inner net 4 directly corresponds to the outer net 5 due to its own weight after the groove is aligned.

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

(1) and (4) injecting neutralizing liquid into the reactor, neutralizing, then discharging the neutralizing liquid, cooling, and dismantling the structure, the pipeline, the electric heater and the instrument components which obstruct the hoisting of the internal components on the upper part of the reactor.

(2) Lifting and moving out the reduction cylinder 2, removing an upper cover plate connected with the conical distributor 3, the inner net 4 and the outer net 5, laying color stripe cloth on a steel grating of the conical distributor 3 to prevent a removing tool and screws from falling into the distributor, and then lifting and moving out the conical distributor 3;

(3) the connection relation between the feeding bent pipe 7 and the catalytic cylinder 1 is removed, the black rubber is used for protecting the connecting flange, and then 3 chain blocks are used for simultaneous operation to vertically and slowly drop the elbow to a proper position;

(4) marks are made on the lifting lugs and the barrel body of the inner net 4 and the outer net 5, then the inner net 4, the outer net 5 and the lower cover plate 10 are integrally lifted out, after the lifting out, on one hand, the inner net 4, the outer net 5 and the lower cover plate 10 are disassembled, the connecting bolts 12 between the inner net 4 and the outer net 5 and the lower cover plate 10 are removed, after the lower cover plate 10 is moved out, the inner net 4 falls due to dead weight and can be blocked by the wedge blocks 14, and on the other hand, the wedge blocks 14 have inclined planes and the telescopic action of the elastic telescopic rods 17, when the inner net 4 falls, although being blocked, the inner net 4 can not block the falling, the falling speed can be reduced, and on the other hand, a worker is sent down to the bottom of the barrel body after the inner net and the outer net are removed to overhaul the expansion joint structure 8;

(5) after cleaning and overhauling the components of the reactor, sequentially reloading the components according to the dismounting sequence, wherein when reloading the inner net and the outer net, the inner net 4 is firstly hoisted into the outer net 5 from the top, and after the groove is aligned, the inner net 4 directly corresponds to the outer net 5 due to self weight.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims

1. A UOP propane dehydrogenation unit reactor comprising:

the device comprises a reduction cylinder (2), a catalytic cylinder (1) and a feeding bent pipe (7) positioned at the lower end of the catalytic cylinder (1), wherein the reduction cylinder (2) and the catalytic cylinder (1) are connected through a sealing flange, a conical distributor (3), an inner net (4) and an outer net (5) are positioned in the catalytic cylinder (1) and are sequentially arranged from inside to outside on the same axis, 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 extreme of intranet (4) and outer net (5) all is connected with apron (10) down through connecting bolt (12), movable mounting has expansion joint structure (8) between the lower extreme of apron (10) and catalytic cartridge (1) bottom inner wall down, be equipped with toper changeover portion (18) between the feed inlet of intranet (4) and feeding return bend (7).

2. A UOP propane dehydrogenation unit reactor according to claim 1, wherein the upper cover plate between the inner mesh (4) and the outer mesh (5) has upper catalyst transport tubes (61) extending through both ends thereof, and the lower cover plate (10) between the inner mesh (4) and the outer mesh (5) has lower catalyst transport tubes (62) extending through both ends thereof.

3. A UOP propane dehydrogenation unit reactor according to claim 2, wherein the lower end of the catalytic cylinder (1) is provided with a limiting sleeve which is sleeved on the lower catalyst conveying pipe (62).

4. A UOP propane dehydrogenation unit reactor according to claim 1, wherein a central purge pipe (9) extending to the bottom inside the conical distributor (3) is provided at the axis of the upper cover plate at the upper end of the conical distributor (3), and the central purge pipe (9) above the upper cover plate extends to the outside of the reduction drum (2) through a right-angled pipe.

5. A UOP propane dehydrogenation unit reactor according to claim 1, wherein the lower cover plate (10) is annular and has a bottom end flush with the bottom ends of the inner and outer nets (4, 5), the connecting bolts (12) between the inner and outer nets (4, 5) and the lower cover plate (10) being located at one side of the inner and outer nets (4, 5), respectively.

6. A UOP propane dehydrogenation unit reactor according to claim 1, wherein the expansion joint structure (8) comprises an outer ring plate (81) and an inner ring plate (82) having their lower ends integrally connected and having a height difference, the outer ring plate (81) is provided with an outer expansion portion (83) in the vertical direction, the inner ring plate (82) is provided with an inner expansion portion (84) in the vertical direction, the inner side of the top end of the inner ring plate (82) is a slope matching with the tapered transition section (18), a connection ring is provided between the upper end flush position of the inner ring plate (82) and the outer ring plate (81), and the outer wall of the outer ring plate (81) is provided with a sliding groove (86) for the connection ring to slide, the upper end of the integral connection position of the bottom ends of the outer ring plate (81) and the inner ring plate (82) is provided with a screw (85) extending above the connection ring, and the head of the screw (85) is provided with a bolt.

7. A UOP propane dehydrogenation reactor according to claim 6, wherein the upper end of the outer annular plate (81) is provided with a clamping groove, and 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 material capable of expanding with heat and contracting with cold.

8. A UOP propane dehydrogenation unit reactor according to claim 1, wherein the vertical direction between the inner net (4) and the outer net (5) is provided with uniformly distributed anti-deformation rods (13), one end of each anti-deformation rod (13) is fixed on the outer net (5), the other end of each anti-deformation rod (13) is connected with a wedge block (14) with an inclined plane at the upper end through an elastic telescopic rod (17) and a connecting rod (16), and the outer wall of the inner net (4) is provided with a wedge groove (15) matched with the wedge block (14).

9. A method of servicing a UOP propane dehydrogenation unit reactor according to any one of claims 1-8, comprising the steps of:

(2) The connection relation between the reduction cylinder (2) and the catalytic cylinder (1) is removed, the reduction cylinder (2) is hoisted and moved out, an upper cover plate connected with the conical distributor (3), the inner net (4) and the outer net (5) is removed, colored strip cloth is laid on a steel grating of the conical distributor (3) to prevent a dismantling tool and screws from falling into the distributor, and then the conical distributor (3) is hoisted and moved out;

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

(4) marks are made on lifting lugs of the inner net (4) and the outer net (5) and the barrel body, then the inner net (4), the outer net (5) and the lower cover plate (10) are integrally lifted out, after the lifting out, on one hand, the inner net (4), the outer net (5) and the lower cover plate (10) are dismantled, and on the other hand, a worker is sent down to the bottom of the barrel body to overhaul the expansion joint structure (8);