CN221287819U - Ethylene recovery system - Google Patents
Ethylene recovery systemInfo
- Publication number
- CN221287819U CN221287819U CN202323247915.6U CN202323247915U CN221287819U CN 221287819 U CN221287819 U CN 221287819U CN 202323247915 U CN202323247915 U CN 202323247915U CN 221287819 U CN221287819 U CN 221287819U
- Authority
- CN
- China
- Prior art keywords
- ethylene
- pipeline
- gate valve
- ethylene recovery
- pipe section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 title claims abstract description 126
- 239000005977 Ethylene Substances 0.000 title claims abstract description 126
- 238000011084 recovery Methods 0.000 title claims abstract description 58
- 230000001105 regulatory effect Effects 0.000 claims abstract description 23
- 238000005336 cracking Methods 0.000 claims abstract description 10
- 238000005804 alkylation reaction Methods 0.000 claims abstract description 8
- 239000011229 interlayer Substances 0.000 claims description 12
- 238000002955 isolation Methods 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 abstract description 18
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 14
- 230000008929 regeneration Effects 0.000 abstract description 8
- 238000011069 regeneration method Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000006872 improvement Effects 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 38
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 6
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 5
- 238000006467 substitution reaction Methods 0.000 description 5
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 230000029936 alkylation Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Abstract
The utility model relates to the technical field of styrene production devices, in particular to an ethylene recovery system, which comprises an ethylene feeding pipeline, an ethylene processor connected with the ethylene feeding pipeline, and an alkylation reaction feeding pipeline connected with the ethylene processor, wherein the ethylene feeding pipeline is connected to a low-pressure flame pipeline through a gas replacement pipeline, the gas replacement pipeline is provided with a flow regulating valve, the downstream pipeline of the flow regulating valve on the gas replacement pipeline is connected with an ethylene recovery pipeline, and the ethylene recovery pipeline is connected to an ethylene cracking device; an overhead off-gas discharge line of the light ends column is connected to the ethylene recovery line. The ethylene recovery flow is increased through technical improvement, the ethylene discharged in the regeneration process of the ethylene processor and the tail gas discharged by the light component removal tower are recovered to the ethylene cracking device, and the ethylene waste is reduced.
Description
Technical Field
The utility model relates to the technical field of styrene production devices, in particular to an ethylene recovery system.
Background
Styrene is an important organic chemical raw material and is widely used in the aspects of synthetic plastics, rubber, synthetic fibers and the like. The production device of the styrene mainly comprises an alkylation reactor and a light component removing tower, wherein the alkylation reactor is used for carrying out catalytic reaction on the benzene and the ethylene to generate the styrene, and the light component removing tower is used for separating reaction products to obtain pure styrene. An ethylene processor is arranged at the upstream of an alkylation reactor in a styrene production device, and is used for processing ethylene gas and supplying raw materials to the reactor, and the ethylene processor needs to be periodically activated and regenerated in the production process.
In the process of activating and regenerating an ethylene processor, the internal ethylene gas needs to be discharged to a low-pressure torch, after the regeneration is finished, the ethylene is required to be filled to replace low-pressure nitrogen in the processor, the low-pressure nitrogen can take away heat released by adsorption of ethylene and an adsorbent in the filling process, and the mixed gas of the ethylene and the low-pressure nitrogen is discharged to a torch system in the process. The entire activation regeneration process takes 48 hours, which consumes a large amount of ethylene. Meanwhile, in normal production of the light component removing tower, about 50kg/h of tail gas at the top of the tower is discharged to a steam superheating furnace for combustion, and the main components of the tail gas are ethylene and ethane gas, so that the waste of the ethylene is also caused in the process.
Disclosure of utility model
In view of the defects of the prior art, the utility model provides an ethylene recovery system, which is characterized in that an ethylene recovery flow is increased by technical improvement, and the ethylene discharged in the regeneration process of an ethylene processor and the tail gas discharged from a light component removal tower are recovered to an ethylene cracking device, so that the waste of ethylene is reduced.
In order to achieve the above object, the present utility model provides an ethylene recovery system, comprising an ethylene feed line, an ethylene processor connected to the ethylene feed line, an alkylation reaction feed line connected to the ethylene processor, the ethylene feed line connected to a low pressure torch line through a gas replacement line, the gas replacement line being provided with a flow regulating valve, an ethylene recovery line connected to a line downstream of the flow regulating valve on the gas replacement line, the ethylene recovery line being connected to an ethylene cracker; an overhead off-gas discharge line of the light ends column is connected to the ethylene recovery line.
Further, a first gate valve, a second gate valve and a third gate valve are sequentially arranged on the ethylene recovery pipeline, and a joint from the top tail gas discharge pipeline to the ethylene recovery pipeline is arranged between the first gate valve and the second gate valve.
Further, a tee joint is arranged between the first gate valve and the second gate valve, and the tee joint is connected with the overhead tail gas discharge pipeline.
Further, a blind plate is arranged on the pipeline between the second gate valve and the third gate valve.
Further, the blind plate comprises an 8-shaped blind plate.
Further, a fifth gate valve is arranged on the gas exchange pipeline upstream of the flow regulating valve.
Further, a sixth gate valve is arranged on the gas replacement pipeline at the downstream of the flow regulating valve, a tee joint is arranged between the flow regulating valve and the sixth gate valve, and the tee joint is connected with the ethylene recovery pipeline.
Further, the gas replacement pipeline comprises a first pipe section provided with the flow regulating valve and a second pipe section connected to a low-pressure flame pipeline, and an isolation blind plate is arranged between the first pipe section and the second pipe section; the isolation blind plate comprises an interlayer body and a connecting pipe section, wherein the interlayer body is provided with a hollow cavity, and the connecting pipe section is provided with a hollow pipeline communicated with the hollow cavity; one side of the interlayer body is sealed and connected with the second pipe section; the other side of the interlayer body is provided with a through hole communicated with the hollow cavity and is connected with the first pipe section; the connecting pipe section is connected with the ethylene recovery pipeline.
Further, a bypass jumper is provided on the gas displacement line, the bypass jumper being connected between the upstream of the fifth gate valve and the downstream of the ethylene recovery line.
Further, the bypass jumper is provided with a seventh gate valve.
The utility model has the beneficial effects that: the device is characterized in that a gas replacement pipeline is arranged, a flow regulating valve is arranged, a pipeline at the downstream of the flow regulating valve on the gas replacement pipeline is connected to an ethylene recovery pipeline, the ethylene recovery pipeline is connected to an ethylene cracking device, the ethylene recovery flow is increased through technical improvement, the tail gas discharged by an ethylene and light component removal tower and discharged by an ethylene processor regeneration process is recovered to the ethylene cracking device, and ethylene and ethane raw materials are recovered again.
Drawings
FIG. 1 is a process flow diagram of an ethylene recovery system in accordance with one embodiment of the present utility model;
FIG. 2 is a process flow diagram of an ethylene recovery system in accordance with another embodiment of the present utility model;
FIG. 3 is a schematic view of a structure of a blind plate according to an embodiment of the present utility model;
FIG. 4 is a front view of a separation blind in an embodiment of the present utility model;
FIG. 5 is a rear view of a separation blind in an embodiment of the present utility model;
In the figure:
100. An ethylene feed line is provided with a feed stream,
200. An ethylene processor, wherein the ethylene processor comprises a first reactor,
300. An alkylation reaction feed line is provided with a catalyst,
400. A gas displacement line 410, a flow regulating valve 420, a fifth gate valve 430, a sixth gate valve 440, a first pipe section 450, a second pipe section 460, a separation blind, 461, a sandwich body, 4611, a hollow chamber, 4612, a through hole, 462, a connection pipe section 4621, a hollow pipe, 470, a bypass jumper, 471, a seventh gate valve,
500. A low-pressure torch line is provided,
600. Ethylene recovery line 610, first gate valve 620, second gate valve 630, third gate valve 640, blind plate,
700. An overhead off-gas discharge line.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.
The ethylene processor 200 of the styrene device in the prior art needs to be regenerated on time according to the process design, and the pressure release process during regeneration is as follows: the ethylene feeding pressure is 4.2MPa, the ethylene density is 40kg/m, the whole pressure relief process takes 4-5 hours, the ethylene amount discharged to a torch system in the stage is 1.5 tons, and the ethylene amount discharged to the torch system in the fourth stage is always 6.5 tons. Co-venting ethylene per regeneration: 1.5 tons +6.5 tons = 8 tons, the ethylene processor is regenerated once per month. In addition, the main components in the tail gas removed by the light component removing tower of the styrene device are ethylene and ethane, the flow is about 50kg/h, and the two processes cause great waste.
Referring to fig. 1, there is shown an ethylene recovery system in an embodiment of the present utility model comprising an ethylene feed line 100, an ethylene processor 200 connected to the ethylene feed line 100, an alkylation reaction feed line 300 connected to the ethylene processor 200, the ethylene feed line 100 being connected to a low pressure torch line 500 via a gas substitution line 400, the gas substitution line 400 being provided with a flow regulating valve 410, an ethylene recovery line 600 being connected to the gas substitution line 400 downstream of the flow regulating valve 410, the ethylene recovery line 600 being connected to an ethylene cracker; an overhead off-gas line 700 of the light ends column is connected to the ethylene recovery line 600.
The gas displacement pipeline 400 of the ethylene recovery system is provided with a flow regulating valve 410, the downstream pipeline of the flow regulating valve 410 on the gas displacement pipeline 400 is connected with an ethylene recovery pipeline 600, the ethylene recovery pipeline 600 is connected to an ethylene cracking device, the ethylene discharged in the regeneration process of the ethylene processor 200 and the tail gas discharged from the light component removal tower are recovered to the ethylene cracking device through the technical improvement of increasing the ethylene recovery flow, the ethylene and ethane raw materials are recovered again, the separated ethane enters a cracking furnace, the ethylene product is produced by dehydrogenation under high-temperature cracking, and the byproduct hydrogen is recovered to a hydrogen pipe network.
In one embodiment, the ethylene recovery line 600 is sequentially provided with a first gate valve 610, a second gate valve 620 and a third gate valve 630, and the joint of the overhead off-gas discharge line 700 to the ethylene recovery line 600 is disposed between the first gate valve 610 and the second gate valve 620.
Referring to fig. 1, in one embodiment, a tee is provided between the first gate valve 610 and the second gate valve 620, the tee being connected to an overhead off-gas discharge line 700.
In one embodiment, the conduit between the second gate valve 620 and the third gate valve 630 is provided with a blind plate 640. Preferably, the blind plate 640 comprises an 8-letter blind plate. It should be noted that the 8-shaped blind plate can be used for overhauling or purging the pipeline, and is convenient for overhauling.
In one embodiment, a fifth gate valve 420 is provided on the gas substitution line 400 upstream of the flow regulating valve 410.
In one embodiment, a sixth gate valve 430 is disposed on the gas displacement line 400 downstream of the flow regulator valve 410, and a tee is disposed between the flow regulator valve 410 and the sixth gate valve 430 and connected to the ethylene recovery line 600.
Referring to fig. 2-4, in another embodiment, the gas substitution line 400 includes a first tube segment 440 provided with a flow regulating valve 410 and a second tube segment 450 connected to a low pressure torch line 500, with an isolation blind plate 460 provided between the first tube segment 440 and the second tube segment 450; the isolation blind plate 460 comprises an interlayer body 461 and a connecting pipe section 462, wherein the interlayer body 461 is provided with a hollow cavity 4611, and the connecting pipe section 462 is provided with a hollow pipeline 4621 communicated with the hollow cavity 4611; the interlayer body 461 is sealed at one side and connected with the second pipe section 450; the other side of the interlayer body 461 is provided with a through hole 4612 communicated with the hollow cavity 4611 and is connected with the first pipe section 440; the connecting pipe section 462 is connected to the ethylene recovery line 600.
It should be noted that the isolation blind plate 460 includes a sandwich body 461 and a connecting pipe 462, and the through hole 4612, the hollow chamber 4611 and the hollow pipe 4621 form a pipe passage on one side of the flow control valve 410, and isolate the second pipe 450 to block the passage of ethylene gas into the low-pressure torch line 500.
In one embodiment, a bypass jumper 470 is provided on the gas displacement line 400, the bypass jumper 470 being connected between the upstream of the fifth gate valve 420 and the downstream of the ethylene recovery line 600. Further, the bypass jumper 470 is provided with a seventh gate valve 471, on the basis of the present embodiment. In this manner, when the downstream ethylene recovery line 600 fails, the seventh gate valve 471 on the bypass jumper 470 may be opened, transitioning to the flow of ethylene gas into the low pressure torch line 500. After the maintenance of the ethylene recovery line 600 is completed, the seventh gate valve 471 is closed.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature. It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Claims (10)
1. An ethylene recovery system comprising an ethylene feed line, an ethylene processor coupled to the ethylene feed line, an alkylation reaction feed line coupled to the ethylene processor, characterized in that:
The ethylene feeding pipeline is connected to the low-pressure flame pipeline through a gas replacement pipeline, the gas replacement pipeline is provided with a flow regulating valve, an ethylene recovery pipeline is connected to a pipeline at the downstream of the flow regulating valve on the gas replacement pipeline, and the ethylene recovery pipeline is connected to an ethylene cracking device;
an overhead off-gas discharge line of the light ends column is connected to the ethylene recovery line.
2. An ethylene recovery system as claimed in claim 1, wherein: the ethylene recovery pipeline is sequentially provided with a first gate valve, a second gate valve and a third gate valve, and a joint between the overhead tail gas discharge pipeline and the ethylene recovery pipeline is arranged between the first gate valve and the second gate valve.
3. An ethylene recovery system as claimed in claim 2, wherein: and a tee joint is arranged between the first gate valve and the second gate valve, and the tee joint is connected with the tail gas discharge pipeline at the top of the tower.
4. An ethylene recovery system as claimed in claim 2, wherein: and a blind plate is arranged on the pipeline between the second gate valve and the third gate valve.
5. An ethylene recovery system as claimed in claim 4, wherein: the blind plate comprises an 8-shaped blind plate.
6. An ethylene recovery system as claimed in claim 1, wherein: and a fifth gate valve is arranged on the gas replacement pipeline at the upstream of the flow regulating valve.
7. An ethylene recovery system as claimed in claim 6, wherein: and a third gate valve is arranged on the gas replacement pipeline and at the downstream of the flow regulating valve, a tee joint is arranged between the flow regulating valve and the third gate valve, and the tee joint is connected with the ethylene recovery pipeline.
8. An ethylene recovery system as claimed in claim 6, wherein: the gas replacement pipeline comprises a first pipe section provided with the flow regulating valve and a second pipe section connected to a low-pressure flame pipeline, and an isolation blind plate is arranged between the first pipe section and the second pipe section; the isolation blind plate comprises an interlayer body and a connecting pipe section, wherein the interlayer body is provided with a hollow cavity, and the connecting pipe section is provided with a hollow pipeline communicated with the hollow cavity; one side of the interlayer body is sealed and connected with the second pipe section; the other side of the interlayer body is provided with a through hole communicated with the hollow cavity and is connected with the first pipe section; the connecting pipe section is connected with the ethylene recovery pipeline.
9. An ethylene recovery system according to claim 7 or 8, characterized in that: the gas replacement pipeline is provided with a bypass overline, and the bypass overline is connected between the upstream of the fifth gate valve and the downstream of the ethylene recovery pipeline.
10. An ethylene recovery system as claimed in claim 9, wherein: and a seventh gate valve is arranged on the bypass overline.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221287819U true CN221287819U (en) | 2024-07-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant |