CN112717470B - Anti-pollution system for head of adsorption tower - Google Patents
Anti-pollution system for head of adsorption tower Download PDFInfo
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- CN112717470B CN112717470B CN202011574206.7A CN202011574206A CN112717470B CN 112717470 B CN112717470 B CN 112717470B CN 202011574206 A CN202011574206 A CN 202011574206A CN 112717470 B CN112717470 B CN 112717470B
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- pipeline
- adsorption tower
- desorbent
- nitrogen pipeline
- valve
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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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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention relates to the technical field of petrochemical industry, in particular to an anti-pollution system for an end socket of an adsorption tower, which comprises a high-pressure nitrogen pipeline, wherein the high-pressure nitrogen pipeline is connected to the end socket 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. The top sealing head of the adsorption tower is externally connected with the desorbent, so that the pressure of the top sealing head is controlled to be increased, the desorbent of the sealing head is ensured to flow into the adsorption tower, and the sealing head is not reversely connected in series, thereby avoiding the phenomenon that the sealing head of the top of the adsorption tower is polluted and PX is unqualified.
Description
Technical Field
The invention relates to the technical field of petrochemical industry, in particular to an anti-pollution system for an end enclosure of an adsorption tower top.
Background
Aromatic hydrocarbons, generally referred to as hydrocarbons having a benzene ring or aromatic ring structure in the molecule, are one of closed-chain hydrocarbons having a benzene ring basic structure. The aromatic hydrocarbon comprises a benzene derivative of 'paraxylene', wherein the paraxylene is one of xylene isomers, and the rest isomers comprise o-xylene and m-xylene.
In the production process of aromatic hydrocarbon, steps such as fractionation, isomerization, adsorption, extraction, disproportionation and the like are generally needed, wherein when an adsorption tower top head of an adsorption unit of an aromatic hydrocarbon factory leaks, the adsorption tower top head is polluted, the adsorption tower top head is connected to the top of the adsorption tower through a U-shaped pipe, if the adsorption tower top head is polluted, PX is possibly unqualified, shutdown maintenance is needed, and huge loss is caused.
Disclosure of Invention
In view of the defects of the prior art, the invention provides an anti-pollution system for an end enclosure of an adsorption tower, which is externally connected with a desorbing agent, controls and improves the pressure of the top end enclosure, ensures that the end enclosure desorbing agent flows into the adsorption tower and does not flow into the end enclosure in a reverse series manner, thereby avoiding the phenomenon that the end enclosure of the adsorption tower is polluted and the PX is unqualified.
In order to achieve the above purpose, the technical scheme provided by the invention is that the anti-pollution system for the head of the adsorption tower comprises a high-pressure nitrogen pipeline, wherein the high-pressure nitrogen pipeline is connected to the 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.
Further, a first valve is arranged on the upstream nitrogen pipeline, and a second valve is arranged on the downstream nitrogen pipeline.
Further, 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 with a pipeline between the first check valve and the fourth valve.
Further, the upstream nitrogen line and the downstream nitrogen line are both connected to the line between the first check valve and the fourth valve.
Further, an adsorption tower desorbent feeding pipeline is connected to the adsorption tower, and a first flow regulating valve group is arranged on the adsorption tower desorbent feeding pipeline.
Further, the desorbent discharging pipeline of the adsorption tower is connected to the adsorption tower, and a second regulating valve group is arranged on the desorbent discharging pipeline of the adsorption tower.
Further, a pressure measuring device is arranged at a position, close to the adsorption tower, on the desorbent discharging pipeline of the adsorption tower.
On the other hand, the invention provides a control method of an anti-pollution system of an end enclosure of an adsorption tower, which is characterized in that under the condition of no shutdown, a pipeline entering an end enclosure of the adsorption tower is cut off, the internal pressure of the pipeline is relieved, a high-pressure nitrogen pipeline is cut off to a raffinate tower pipeline, a desorbent is respectively fed into the high-pressure desorbent from an upstream nitrogen pipeline and a downstream nitrogen pipeline through a desorbent feeding pipeline by the high-pressure nitrogen pipeline, and the end enclosure pressure of the adsorption tower is improved.
The invention has the beneficial effects that: according to the invention, through the transformation of the top end enclosure exhaust pipeline, the pressure of the top end enclosure is controlled and improved by externally connecting the desorbing agent, the end enclosure desorbing agent is ensured to flow into the adsorption tower, and the end enclosure is not reversely connected into the end enclosure, so that the phenomenon that the end enclosure of the adsorption tower top is polluted and PX is unqualified is avoided.
Drawings
FIG. 1 is a process flow diagram of the present invention;
in the figure: 1. high-pressure nitrogen pipelines, 1.1, third valves, 1.2, first check valves, 1.3, fourth valves, 2, upstream nitrogen pipelines, 2.1, first valves, 3, downstream nitrogen pipelines, 3.1, second valves, 4, top heads of adsorption towers, 5, desorbent supplementing pipelines, 5.1, fifth valves, 6, raffinate towers, 7, desorbent feeding pipelines of the adsorption towers, 7.1, first flow regulating valve groups, 8, desorbent discharging pipelines of the adsorption towers, 8.1, second regulating valve groups, 8.2, pressure measuring devices, 9 and circulating pump feeding pipelines.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The anti-pollution system of the head of the adsorption tower comprises a high-pressure nitrogen pipeline 1, wherein the high-pressure nitrogen pipeline 1 is connected to a top head 4 of the 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 into 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 lines between the first check valve 1.2 and the fourth valve 1.
Further, 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 at a position, close to the adsorption tower, on the desorbent discharge pipeline 8 of the adsorption tower.
Further, a circulation pump feed line 9 is connected to the bed layer of the adsorption tower.
On the other hand, the invention provides a control method of an anti-pollution system of an end enclosure of an adsorption tower, which cuts off a pipeline entering an end enclosure of the adsorption tower under a non-shutdown state, discharges the internal pressure of the pipeline, cuts off the pipelines from a high-pressure nitrogen pipeline 1 to a raffinate tower 6, and fills a high-pressure desorbent from an upstream nitrogen pipeline 2 and a downstream nitrogen pipeline 3 respectively through the high-pressure nitrogen pipeline 1 by a desorbent filling pipeline 5 so as to improve the pressure of the end enclosure 4 of the adsorption tower.
Specifically, the system modification method of the present embodiment is that,
step 1: on the premise of no shutdown, the first valve 2.1, the second valve 3.1, the third valve 1.1 and the fourth valve 1.3 are closed, the pressure in the pipeline is released, the pipeline is released to a torch, the desorbent is added to supplement the pipeline 5 to the desorbent, and the fifth valve 5.1 is added.
It is noted that relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like 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 understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. Adsorption tower top head anti-pollution system, its characterized in that: the high-pressure nitrogen pipeline is connected to a 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 the raffinate tower; 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 with a pipeline between the first check valve and the fourth valve; the upstream nitrogen pipeline and the downstream nitrogen pipeline are connected to the pipeline between the first check valve and the fourth valve.
2. The adsorption column top head pollution prevention system according to claim 1, wherein: the upstream nitrogen pipeline is provided with a first valve, and the downstream nitrogen pipeline is provided with a second valve.
3. The adsorption column top head pollution prevention system according to claim 1, wherein: the 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.
4. The adsorption column top head pollution prevention system according to claim 1, wherein: the desorbent discharge pipeline of the adsorption tower is connected to the adsorption tower, and a second regulating valve group is arranged on the desorbent discharge pipeline of the adsorption tower.
5. The adsorption column top head contamination prevention system of claim 4, wherein: and a pressure measuring device is arranged at a position, close to the adsorption tower, on the desorbent discharging pipeline of the adsorption tower.
6. The control method of the anti-pollution system of the head of the adsorption tower is characterized by comprising the following steps: under the non-shutdown state, cutting off a pipeline entering the top sealing head of the adsorption tower, discharging the internal pressure of the pipeline, adding a desorbent supplementing pipeline to the high-pressure nitrogen pipeline, cutting off the high-pressure nitrogen pipeline to the raffinate tower pipeline, supplementing the desorbent to the top sealing head of the adsorption tower from the upstream nitrogen pipeline and the downstream nitrogen pipeline respectively through the high-pressure nitrogen pipeline by the desorbent supplementing pipeline, and improving the top sealing 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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| Publication Number | Publication Date |
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| CN112717470A CN112717470A (en) | 2021-04-30 |
| CN112717470B true 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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| CN112717470A (en) | 2021-04-30 |
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