CN112717470A - Adsorption tower top head anti-pollution system - Google Patents
Adsorption tower top head anti-pollution system Download PDFInfo
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- CN112717470A CN112717470A CN202011574206.7A CN202011574206A CN112717470A CN 112717470 A CN112717470 A CN 112717470A CN 202011574206 A CN202011574206 A CN 202011574206A CN 112717470 A CN112717470 A CN 112717470A
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- pipeline
- adsorption tower
- top head
- nitrogen pipeline
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
- B01D15/42—Selective adsorption, e.g. chromatography characterised by the development mode, e.g. by displacement or by elution
- B01D15/424—Elution mode
- B01D15/426—Specific type of solvent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
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- Separation Of Gases By Adsorption (AREA)
Abstract
The invention relates to the technical field of petrochemical industry, in particular to an adsorption tower top head anti-pollution system which comprises a high-pressure nitrogen pipeline, wherein the high-pressure nitrogen pipeline is connected to a top head of an adsorption tower through an upstream nitrogen pipeline and a downstream nitrogen pipeline respectively, a desorbent supplementing pipeline is connected to the high-pressure nitrogen pipeline, and the high-pressure nitrogen pipeline is connected to a raffinate tower. The top head of the adsorption tower is externally connected with a desorbent, so that the pressure of the top head is controlled and improved, the desorbent of the top head flows into the adsorption tower without reversely crossing the interior of the top head, and the phenomenon that the adsorption tower top head is polluted to cause PX to be unqualified is avoided.
Description
Technical Field
The invention relates to the technical field of petrochemical industry, in particular to an adsorption tower top head anti-pollution system.
Background
Aromatic hydrocarbons generally refer to hydrocarbons having a benzene ring or aromatic ring structure in the molecule, and are one of closed-chain hydrocarbons having a benzene ring basic structure. The aromatic hydrocarbon comprises a benzene derivative "para-xylene", which is one of the xylene isomers, the remaining isomers including ortho-xylene and meta-xylene.
The production process of the aromatic hydrocarbon generally needs to be subjected to the steps of fractionation, isomerization, adsorption, extraction, disproportionation and the like, wherein when an adsorption tower top head of an adsorption unit in an aromatic hydrocarbon factory leaks, the adsorption tower top head is polluted, the adsorption tower top head is connected to the top of an adsorption tower through a U-shaped pipe, if the adsorption tower top head is polluted, the PX is unqualified possibly, shutdown and maintenance are needed, and the loss is huge.
Disclosure of Invention
In view of the defects of the prior art, the invention provides an anti-pollution system for an adsorption tower top head, which is externally connected with a desorbent, controls and improves the pressure of the top head, ensures that the desorbent of the top head flows into an adsorption tower without reversely crossing the interior of the top head, and thus avoids the phenomenon that the adsorption tower top head is polluted to cause PX to be unqualified.
In order to achieve the purpose, the anti-pollution system for the adsorption tower top head comprises a high-pressure nitrogen pipeline, wherein the high-pressure nitrogen pipeline is connected to the top head of the adsorption tower through an upstream nitrogen pipeline and a downstream nitrogen pipeline respectively, a desorbent supplementing pipeline is connected to the high-pressure nitrogen pipeline, and the high-pressure nitrogen pipeline is connected to a raffinate tower.
Furthermore, a first valve is arranged on the upstream nitrogen pipeline, and a second valve is arranged on the downstream nitrogen pipeline.
Furthermore, a third valve, a first check valve and a fourth valve are sequentially arranged on the high-pressure nitrogen pipeline, a fifth valve is arranged on the desorbent supplementing pipeline, and the desorbent supplementing pipeline is connected to a pipeline between the first check valve and the fourth valve.
Further, the upstream nitrogen pipeline and the downstream nitrogen pipeline are connected to a pipeline between the first check valve and the fourth valve.
Furthermore, a desorbent feeding pipeline of the adsorption tower is connected to the adsorption tower, and a first flow regulating valve group is arranged on the desorbent feeding pipeline of the adsorption tower.
Furthermore, an adsorbent discharge pipeline of the adsorption tower is connected to the adsorption tower, and a second regulating valve group is arranged on the adsorbent discharge pipeline of the adsorption tower.
Furthermore, a pressure measuring device is arranged on a desorption agent discharge pipe line of the adsorption tower close to the adsorption tower.
On the other hand, the invention provides a control method of an adsorption tower top head anti-pollution system, under the condition of not stopping working, a pipeline entering a top head of an adsorption tower is cut off, the internal pressure of the pipeline is discharged, a high-pressure nitrogen pipeline is cut off to a raffinate tower pipeline, a desorbent is respectively supplemented with the high-pressure desorbent from an upstream nitrogen pipeline and a downstream nitrogen pipeline through a desorbent supplementing pipeline, and the top head pressure of the adsorption tower is improved.
The invention has the beneficial effects that: according to the invention, the top head exhaust pipeline is modified, the desorption agent is externally connected, the pressure of the top head is controlled and increased, the desorption agent of the top head is ensured to flow into the adsorption tower and not to reversely cross the adsorption tower into the top head, and thus the phenomenon that the adsorption tower top head is polluted to cause PX to be unqualified is avoided.
Drawings
FIG. 1 is a process flow diagram of the present invention;
in the figure: 1. the device comprises a high-pressure nitrogen pipeline, a 1.1, a third valve, a 1.2, a first check valve, a 1.3, a fourth valve, a 2 upstream nitrogen pipeline, a 2.1, a first valve, a 3 downstream nitrogen pipeline, a 3.1, a second valve, a 4, a top head of an adsorption tower, a 5 desorbent supplement pipeline, a 5.1, a fifth valve, a 6, a raffinate tower, a 7, a desorbent feed pipeline of the adsorption tower, a 7.1, a first flow regulating valve group, a 8, a desorbent discharge pipeline of the adsorption tower, a 8.1, a second regulating valve group, a 8.2, a pressure measuring device, a 9 and a circulating pump incoming pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An adsorption tower top head anti-pollution system comprises a high-pressure nitrogen pipeline 1, wherein the high-pressure nitrogen pipeline 1 is connected to a top head 4 of an adsorption tower through an upstream nitrogen pipeline 2 and a downstream nitrogen pipeline 3 respectively, a desorbent supplementing pipeline 5 is connected to the high-pressure nitrogen pipeline 1, and the high-pressure nitrogen pipeline 1 is connected to a raffinate tower 6.
Further, a first valve 2.1 is arranged on the upstream nitrogen pipeline 2, and a second valve 3.1 is arranged on the downstream nitrogen pipeline 3.
Further, a third valve 1.1, a first check valve 1.2 and a fourth valve 1.3 are sequentially arranged on the high-pressure nitrogen pipeline 1, a fifth valve 5.1 is arranged on the desorbent supplementing pipeline 5, and the desorbent supplementing pipeline 5 is connected to a pipeline between the first check valve 1.2 and the fourth valve 1.3.
Further, the upstream nitrogen line 2 and the downstream nitrogen line 3 are connected to the line between the first check valve 1.2 and the fourth valve 1.
Furthermore, an adsorption tower desorbent feeding pipeline 7 is connected to the adsorption tower, and a first flow regulating valve group 7.1 is arranged on the adsorption tower desorbent feeding pipeline 7.
Further, an adsorption tower desorbent discharge pipeline 8 is connected to the adsorption tower, and a second regulating valve group 8.1 is arranged on the adsorption tower desorbent discharge pipeline 8.
Further, a pressure measuring device 8.2 is arranged on a desorption agent discharge pipeline 8 of the adsorption tower at a position close to the adsorption tower.
Further, a circulation pump feed line 9 is connected to the bed of the adsorption column.
On the other hand, the invention provides a control method of an adsorption tower top head anti-pollution system, under the state of not stopping working, a pipeline entering a top head of an adsorption tower is cut off, the internal pressure of the pipeline is discharged, a pipeline from a high-pressure nitrogen pipeline 1 to a raffinate tower 6 is cut off, a desorbent is respectively supplemented with a high-pressure desorbent from an upstream nitrogen pipeline 2 and a downstream nitrogen pipeline 3 through a desorbent supplementing pipeline 5, and the pressure of the top head 4 of the adsorption tower is improved.
Specifically, the system modification method of the present embodiment is,
step 1: on the premise of not stopping working, the first valve 2.1, the second valve 3.1, the third valve 1.1 and the fourth valve 1.3 are closed, pressure in the pipeline is discharged, then the pressure is discharged to a torch, desorbent is added to supplement the pipeline 5 to the desorbent, and the fifth valve 5.1 is added.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. Adsorption tower top head anti-pollution system, its characterized in that: the device comprises a high-pressure nitrogen pipeline, wherein the high-pressure nitrogen pipeline is connected to a top head of an adsorption tower through an upstream nitrogen pipeline and a downstream nitrogen pipeline respectively, a desorbent supplementing pipeline is connected to the high-pressure nitrogen pipeline, and the high-pressure nitrogen pipeline is connected to a raffinate tower.
2. The adsorption tower top head anti-pollution system according to claim 1, characterized in that: and a first valve is arranged on the upstream nitrogen pipeline, and a second valve is arranged on the downstream nitrogen pipeline.
3. The adsorption tower top head anti-pollution system according to claim 1, characterized in that: and a third valve, a first check valve and a fourth valve are sequentially arranged on the high-pressure nitrogen pipeline, a fifth valve is arranged on the desorbent supplementing pipeline, and the desorbent supplementing pipeline is connected to a pipeline between the first check valve and the fourth valve.
4. The adsorption tower top head anti-pollution system according to claim 3, characterized in that: and the upstream nitrogen pipeline and the downstream nitrogen pipeline are connected to a pipeline between the first check valve and the fourth valve.
5. The adsorption tower top head anti-pollution system according to claim 1, characterized in that: the absorption tower desorbent feed pipeline is connected to the absorption tower, and a first flow regulating valve group is arranged on the absorption tower desorbent feed pipeline.
6. The adsorption tower top head anti-pollution system according to claim 1, characterized in that: and a desorption agent discharge pipeline of the adsorption tower is connected to the adsorption tower, and a second regulating valve group is arranged on the desorption agent discharge pipeline of the adsorption tower.
7. The adsorption tower top head anti-pollution system according to claim 6, wherein: and a pressure measuring device is arranged at a position close to the adsorption tower on the desorption agent discharge pipe line of the adsorption tower.
8. The control method of the anti-pollution system of the adsorption tower top head is characterized in that: cutting off a pipeline entering a top head of the adsorption tower under a non-stop state, discharging the internal pressure of the pipeline, cutting off a high-pressure nitrogen pipeline to a raffinate tower pipeline, and respectively supplementing a high-pressure desorbent from an upstream nitrogen pipeline and a downstream nitrogen pipeline through a desorbent supplementing pipeline and a high-pressure nitrogen pipeline to improve the top head pressure of the adsorption tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011574206.7A CN112717470B (en) | 2020-12-28 | 2020-12-28 | Anti-pollution system for head of adsorption tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011574206.7A CN112717470B (en) | 2020-12-28 | 2020-12-28 | Anti-pollution system for head of adsorption tower |
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| CN112717470A true CN112717470A (en) | 2021-04-30 |
| CN112717470B CN112717470B (en) | 2023-10-13 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1780802A (en) * | 2003-05-01 | 2006-05-31 | Bp北美公司 | Method of obtaining para-xylene |
| CN106278781A (en) * | 2015-06-04 | 2017-01-04 | 中国石油化工股份有限公司 | A kind of light paraffins isomerization method |
| CN107930343A (en) * | 2017-12-30 | 2018-04-20 | 大连福佳·大化石油化工有限公司 | Adsorption tower backwashing system and method |
| CN110804461A (en) * | 2019-12-18 | 2020-02-18 | 大连福佳·大化石油化工有限公司 | Bed leakage-proof system of adsorption tower |
-
2020
- 2020-12-28 CN CN202011574206.7A patent/CN112717470B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1780802A (en) * | 2003-05-01 | 2006-05-31 | Bp北美公司 | Method of obtaining para-xylene |
| CN106278781A (en) * | 2015-06-04 | 2017-01-04 | 中国石油化工股份有限公司 | A kind of light paraffins isomerization method |
| CN107930343A (en) * | 2017-12-30 | 2018-04-20 | 大连福佳·大化石油化工有限公司 | Adsorption tower backwashing system and method |
| CN110804461A (en) * | 2019-12-18 | 2020-02-18 | 大连福佳·大化石油化工有限公司 | Bed leakage-proof system of adsorption tower |
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| CN112717470B (en) | 2023-10-13 |
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