CN114432887A - Amine liquid regeneration circulation system - Google Patents
Amine liquid regeneration circulation system Download PDFInfo
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- CN114432887A CN114432887A CN202111634519.1A CN202111634519A CN114432887A CN 114432887 A CN114432887 A CN 114432887A CN 202111634519 A CN202111634519 A CN 202111634519A CN 114432887 A CN114432887 A CN 114432887A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
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Abstract
The invention provides an amine liquid regeneration circulation system, which comprises: a regeneration module and a flow auxiliary line pipe; the liquid inlet end of the auxiliary flow line pipe is connected with the barren liquor outlet of the regeneration module, and the liquid outlet end of the auxiliary flow line pipe is connected with the rich liquor inlet of the regeneration module, so that the regeneration module and the auxiliary flow line pipe form a closed circulation line. The amine liquid regeneration circulation system can realize internal self circulation during the shutdown of the coking device and the hydrogenation device and the normal operation of the tail gas absorption tower of the sulfur production system, thoroughly replace lean solution and rich solution pipelines and ensure the realization of the comprehensive maintenance of a gasoline processing system; the invention avoids the condition of maintenance time reduction caused by the prolonging of start-up, shutdown, construction and purging time, and solves the technical problem of energy consumption increase caused by steam purging and replacement.
Description
Technical Field
The invention belongs to the technical field of oil refining chemical production equipment, and particularly relates to an amine liquid regeneration circulation system.
Background
In the prior art, an amine liquid regeneration circulation system is responsible for maintaining the circulation of amine liquid of a coking device, a hydrogenation device, a gas holder device, a gasoline hydrogenation device and an absorption tower. Due to the particularity of the process, the amine liquid in the absorption tower needs to be normally circulated all the time to ensure that the sulfur dioxide can reach the emission standard. However, during coke burning shutdown and maintenance, the coker and hydrogenator need to stop the amine liquor circulation, and the shutdown results in the failure of the amine liquor circulation volume in the absorber to maintain minimum load production.
When the amine liquid regeneration circulating system, the coking device and the hydrogenation device are synchronously stopped and overhauled, the amine liquid circulation of the gas holder device, the gasoline hydrogenation device and the absorption tower is maintained to be normally produced by the circulation of the secondary amine liquid regeneration system. And the secondary amine liquid is conveyed to the absorption tower for circulation through a barren liquor delivery line in a circulating manner, and the barren liquor delivery flow is occupied, so that an amine liquor regeneration system cannot normally carry out amine liquor thermal circulation. And the rich solution contains a large amount of hydrogen sulfide, and a large amount of hydrogen sulfide is accumulated in the lean solution tank and the amine solution regeneration system in the shutdown liquid withdrawal and purging process, so that the amine solution regeneration system needs to be replaced by a large amount of nitrogen before shutdown purging, and the hydrogen sulfide discharged during purging is prevented from polluting the surrounding environment. The replacement time is prolonged due to the higher hydrogen sulfide content, so that the downtime is prolonged, and the consumption of steam and nitrogen is increased compared with the conventional overhaul. Occupy lean solution and rich liquid line simultaneously and can cause two pipelines can't sweep the replacement, lead to the maintenance period can not carry out thorough maintenance, have the maintenance blind area, have certain threat to the long period operation of system.
Disclosure of Invention
In order to solve the technical problem, the invention provides an amine liquid regeneration circulation system. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
The invention adopts the following technical scheme:
in some alternative embodiments, there is provided an amine liquid regeneration circulation system comprising: a regeneration module and a flow auxiliary line pipe; the liquid inlet end of the auxiliary line pipe of the flow path is connected with the barren liquor outlet of the regeneration module, and the liquid outlet end of the auxiliary line pipe of the flow path is connected with the rich liquor inlet of the regeneration module, so that the regeneration module and the auxiliary line pipe of the flow path form a closed circulation pipeline.
Further, the amine liquid regeneration circulation system further comprises: and the rich liquid filter is connected with a rich liquid inlet of the regeneration module and is used for conveying the filtered rich liquid to the regeneration module.
Further, the amine liquid regeneration circulation system further comprises: and the lean solution tank is connected with a lean solution outlet of the regeneration module, and the regeneration module converts rich solution into lean solution and then conveys the lean solution to the lean solution tank or the flow secondary pipeline.
Further, the regeneration module includes: the system comprises a flash tank, a regeneration tower, a rich liquid pump and a lean liquid pump; and the rich liquid pump pumps the rich liquid discharged by the flash tank to the regeneration tower, and the barren liquid pump pumps the barren liquid converted by the regeneration tower to the barren liquid tank or the flow path secondary line.
Further, the regeneration module further comprises:
the first heat exchanger is used for realizing heat exchange between the rich liquid discharged by the flash tank and the lean liquid discharged by the regeneration tower;
and the second heat exchanger is used for realizing heat exchange between the lean solution discharged by the first heat exchanger and the rich solution discharged by the rich solution filter.
Further, the regeneration module further comprises: the lean solution discharged by the second heat exchanger sequentially passes through the air cooler and the water cooler to be cooled, and the cooled lean solution is conveyed to the lean solution tank or in the flow secondary pipeline
Further, the amine liquid regeneration circulation system further comprises: an external pump, an absorption tower and a reflux pump; the outward-feeding pump pumps the lean solution in the lean solution tank to a gasoline processing system and the absorption tower, and the return pump pumps the rich solution discharged from the absorption tower to the rich solution filter.
Furthermore, a liquid inlet valve and a liquid outlet valve are arranged on the flow auxiliary line pipe.
The invention has the following beneficial effects: the amine liquid regeneration circulation system can realize internal self-circulation during the shutdown of the coking device and the hydrogenation device and the normal operation of the tail gas absorption tower of the sulfur production system, thoroughly replace lean solution and rich solution pipelines and ensure the realization of the comprehensive overhaul of a gasoline processing system; the invention avoids the condition of maintenance time reduction caused by the prolonging of start-up, shutdown, construction and purging time, and solves the technical problem of energy consumption increase caused by steam purging and replacement.
Drawings
FIG. 1 is a schematic diagram of an amine liquid regeneration cycle system according to the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others.
In some illustrative embodiments, as shown in fig. 1, the present disclosure provides an amine liquid regeneration circulation system comprising: the system comprises a regeneration module 1, a process auxiliary line pipe 2, a rich liquid filter 3, a lean liquid tank 5, an outward pump 6, an absorption tower 7 and a reflux pump 8.
The rich liquid filter 3 is used to filter the rich liquid, is connected to a rich liquid inlet of the regeneration module 1, and delivers the filtered rich liquid to the regeneration module 1. The rich liquid delivered to the rich liquid filter 3 comprises two parts, one part of the rich liquid comes from a gasoline processing system, and the other part comes from an absorption tower 7, wherein the gasoline processing system comprises: coking unit, hydrogenation unit, gas holder device, gasoline hydrogenation unit.
The regeneration module 1 and the auxiliary flow line pipe 2 are arranged on the amine liquid flow path in parallel, namely, the liquid inlet end 201 of the auxiliary flow line pipe 2 is connected with the lean liquid outlet of the regeneration module 1, and the liquid outlet end 202 of the auxiliary flow line pipe 2 is connected with the rich liquid inlet of the regeneration module 1, so that the regeneration module 1 and the auxiliary flow line pipe 2 form a closed circulation line, the regeneration module 1 realizes self circulation, and further the flow of communicating the lean liquid and the rich liquid is realized.
The lean solution tank 5 is connected with a lean solution outlet of the regeneration module 1, the regeneration module 1 is used for converting the rich solution into the lean solution, and the lean solution is conveyed into the lean solution tank 5 or the flow auxiliary line pipe 2 after the rich solution is converted into the lean solution by the regeneration module 1.
The regeneration module 1 includes: the system comprises a flash drum 101, a regeneration tower 102, a rich liquid pump 103, a lean liquid pump 104, a first heat exchanger 105, a second heat exchanger 106, an air cooler 107 and a water cooler 108.
The rich liquid with high pressure and high temperature is decompressed to lower the boiling point and enters the flash tank 101, at this time, the temperature of the rich liquid is higher than the boiling point under the pressure, the rich liquid is boiled and vaporized in the flash tank 101 rapidly, and two-phase separation is carried out, and the flash tank 101 is used for providing space for rapid vaporization and vapor-liquid separation of the rich liquid. The regeneration tower 102 is used for converting the rich solution into a lean solution, i.e. removing sulfur dioxide from the rich solution, and the desulfurization belongs to the prior art, and is not described in detail herein.
The rich liquid pump 103 pumps the rich liquid discharged from the flash tank 101 to the regeneration tower 102, and the lean liquid pump 104 pumps the lean liquid switched out from the regeneration tower 102 to the lean liquid tank 5 or the process bypass 2.
A first heat exchanger 105 for exchanging heat between the rich liquid discharged from the flash drum 101 and the lean liquid discharged from the regeneration tower 102. Specifically, the first heat exchanger 105 is disposed on a pipeline connecting the flash tank 101 and the regeneration tower 102 and a pipeline connecting the regeneration tower 102 and the lean liquid tank 5, and the rich liquid discharged from the flash tank 101 and the lean liquid discharged from the regeneration tower 102 exchange heat in the first heat exchanger 105.
And a second heat exchanger 106 for exchanging heat between the lean solution discharged from the first heat exchanger 105 and the rich solution discharged from the rich filter 3. Specifically, the second heat exchanger 106 is disposed on a pipeline connecting the first heat exchanger 105 and the lean solution tank 5 and a pipeline connecting the flash tank 101 and the rich solution filter 3, and the rich solution discharged from the rich solution filter 3 and the lean solution discharged from the first heat exchanger 105 perform heat exchange in the second heat exchanger 106.
The design of the first heat exchanger 105 and the second heat exchanger 106 can ensure that the rich solution meets the conditions of flashing and regeneration.
The water cooler 108 is arranged on the output side of the air cooler 107, the lean solution discharged by the second heat exchanger 106 is sequentially cooled by the air cooler 107 and the water cooler 108, and the cooled lean solution is conveyed into the lean solution tank 5 or the process secondary line 2. The design of the water cooler 108 and the air cooler 107 can realize the rapid cooling of the lean solution, so that the lean solution can be conveniently used in the subsequent process.
According to the invention, the auxiliary flow line pipe 2 is arranged between the rich liquid filter 3 and the second heat exchanger 106, the auxiliary flow line pipe 2 spans across the flash tank 101, the water cooler 108 and the air cooler 107, and the water cooler 108 is connected with the lean liquid tank 5, so that the flow of communicating the lean liquid and the rich liquid is realized.
The self-circulation is established, and the rich solution in the amine solution regeneration system is completely replaced by the qualified lean solution through internal flow heating. After the amine liquid is replaced by the qualified barren solution, the content of the hydrogen sulfide in the amine liquid regeneration system is reduced, so that the steam purging time is shortened, and the steam purging time can be shortened by 8 hours according to the measurement result of the on-site hydrogen sulfide alarm instrument. The steam consumption of the amine liquid regeneration system is about 5 tons/hour, so that the invention can save 40 tons of steam by one-time purging.
After the lean solution and the rich solution secondary line are added, the amine solution of the absorption tower circulates under the working condition of non-stop use, the amine solution regeneration system can realize the self-circulation of the internal amine solution, ensure that the amine solution in the amine solution system is completely replaced by the qualified lean solution, reduce the hydrogen sulfide content of the system, improve the shutdown safety factor of the device, ensure the safety of personnel and avoid the phenomenon of polluting the surrounding environment. The invention shortens the time of nitrogen replacement for 4 hours at least.
The lean liquid in the lean liquid tank 5 is pumped into the gasoline processing system and the absorption tower 7 by the outward-feeding pump 6, and the rich liquid discharged from the absorption tower 7 is pumped into the rich liquid filter 3 by the return pump 8.
The process secondary pipe 2 is provided with a liquid inlet valve 203 and a liquid outlet valve 204.
When the valve is normally started, the liquid inlet valve 203 and the liquid outlet valve 204 are closed, the flow auxiliary line pipe 2 is closed and isolated by a blind plate, and the quality of barren liquor is prevented from being influenced by leakage in the valve. When the system enters a shutdown state, before the system is completely isolated from an upstream desulphurization device to establish internal circulation, the blind plate is removed, then the liquid inlet valve 203 and the liquid outlet valve 204 are opened to ensure that lean solution and rich solution pipelines are communicated to realize internal self-circulation, and amine liquid in the system is completely replaced into qualified lean solution by steam heating to enter the lean solution tank 5 for storage.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
Claims (8)
1. An amine liquid regeneration cycle system, comprising: a regeneration module and a flow auxiliary line pipe; the liquid inlet end of the auxiliary line pipe of the flow path is connected with the barren liquor outlet of the regeneration module, and the liquid outlet end of the auxiliary line pipe of the flow path is connected with the rich liquor inlet of the regeneration module, so that the regeneration module and the auxiliary line pipe of the flow path form a closed circulation pipeline.
2. The amine liquid regeneration circulation system of claim 1, further comprising: and the rich liquid filter is connected with a rich liquid inlet of the regeneration module and is used for conveying the filtered rich liquid to the regeneration module.
3. The amine liquid regeneration circulation system according to claim 2, further comprising: and the lean solution tank is connected with a lean solution outlet of the regeneration module, and the regeneration module converts rich solution into lean solution and then conveys the lean solution to the lean solution tank or the flow secondary pipeline.
4. The amine liquid regeneration circulation system of claim 3, wherein the regeneration module comprises: the system comprises a flash tank, a regeneration tower, a rich liquid pump and a lean liquid pump; and the rich liquid pump pumps the rich liquid discharged by the flash tank to the regeneration tower, and the barren liquid pump pumps the barren liquid converted by the regeneration tower to the barren liquid tank or the flow path secondary line.
5. The amine liquid regeneration circulation system of claim 4, wherein the regeneration module further comprises:
the first heat exchanger is used for realizing heat exchange between the rich liquid discharged by the flash tank and the lean liquid discharged by the regeneration tower;
and the second heat exchanger is used for realizing heat exchange between the lean solution discharged by the first heat exchanger and the rich solution discharged by the rich solution filter.
6. The amine liquid regeneration circulation system of claim 5, wherein the regeneration module further comprises: the lean solution discharged by the second heat exchanger sequentially passes through the air cooler and the water cooler to be cooled, and the cooled lean solution is conveyed to the lean solution tank or the flow secondary line pipe.
7. An amine liquid regeneration circulation system according to claim 6, further comprising: an external pump, an absorption tower and a reflux pump; the outward-feeding pump pumps the lean solution in the lean solution tank to a gasoline processing system and the absorption tower, and the return pump pumps the rich solution discharged from the absorption tower to the rich solution filter.
8. The amine liquid regeneration cycle system of claim 7, wherein the process bypass pipe is provided with an inlet valve and an outlet valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111634519.1A CN114432887A (en) | 2021-12-29 | 2021-12-29 | Amine liquid regeneration circulation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111634519.1A CN114432887A (en) | 2021-12-29 | 2021-12-29 | Amine liquid regeneration circulation system |
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| CN114432887A true CN114432887A (en) | 2022-05-06 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070284240A1 (en) * | 2006-06-09 | 2007-12-13 | Roy Wade Rhodes | System and method for diagnosing and troubleshooting amine regeneration system |
| CN104226096A (en) * | 2014-09-25 | 2014-12-24 | 长沙华时捷环保科技发展有限公司 | Multi-flow-path circulating desulfurization system and multi-flow-path circulating desulfurization method |
| CN204672142U (en) * | 2015-04-27 | 2015-09-30 | 长岭炼化岳阳工程设计有限公司 | A kind of centralized energy-saving amine liquid regenerating unit |
| CN206924623U (en) * | 2017-05-24 | 2018-01-26 | 山东金诚重油化工技术研究院 | A kind of desulfurization regeneration tower circulates heat riser |
| CN210831944U (en) * | 2020-05-20 | 2020-06-23 | 山东东方华龙工贸集团有限公司 | Solvent regeneration waste heat recycling system |
| CN211837274U (en) * | 2020-01-19 | 2020-11-03 | 伍强 | Natural gas purification and desulfurization system |
-
2021
- 2021-12-29 CN CN202111634519.1A patent/CN114432887A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070284240A1 (en) * | 2006-06-09 | 2007-12-13 | Roy Wade Rhodes | System and method for diagnosing and troubleshooting amine regeneration system |
| CN104226096A (en) * | 2014-09-25 | 2014-12-24 | 长沙华时捷环保科技发展有限公司 | Multi-flow-path circulating desulfurization system and multi-flow-path circulating desulfurization method |
| CN204672142U (en) * | 2015-04-27 | 2015-09-30 | 长岭炼化岳阳工程设计有限公司 | A kind of centralized energy-saving amine liquid regenerating unit |
| CN206924623U (en) * | 2017-05-24 | 2018-01-26 | 山东金诚重油化工技术研究院 | A kind of desulfurization regeneration tower circulates heat riser |
| CN211837274U (en) * | 2020-01-19 | 2020-11-03 | 伍强 | Natural gas purification and desulfurization system |
| CN210831944U (en) * | 2020-05-20 | 2020-06-23 | 山东东方华龙工贸集团有限公司 | Solvent regeneration waste heat recycling system |
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