CN220554637U - Oilfield associated gas carbon capture system - Google Patents
Oilfield associated gas carbon capture system Download PDFInfo
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- CN220554637U CN220554637U CN202420239889.8U CN202420239889U CN220554637U CN 220554637 U CN220554637 U CN 220554637U CN 202420239889 U CN202420239889 U CN 202420239889U CN 220554637 U CN220554637 U CN 220554637U
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- Prior art keywords
- gas
- associated gas
- tower
- heat exchanger
- absorbent
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 20
- 230000002745 absorbent Effects 0.000 claims abstract description 59
- 239000002250 absorbent Substances 0.000 claims abstract description 59
- 239000007788 liquid Substances 0.000 claims abstract description 47
- 238000010521 absorption reaction Methods 0.000 claims abstract description 42
- 230000008929 regeneration Effects 0.000 claims abstract description 36
- 238000011069 regeneration method Methods 0.000 claims abstract description 36
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 27
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 27
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 27
- 238000011084 recovery Methods 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims description 20
- 238000009833 condensation Methods 0.000 claims description 12
- 230000005494 condensation Effects 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 101
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 46
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 23
- 239000001569 carbon dioxide Substances 0.000 abstract description 23
- 238000000034 method Methods 0.000 abstract description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 16
- 239000000126 substance Substances 0.000 abstract description 11
- 239000003345 natural gas Substances 0.000 abstract description 8
- 239000003921 oil Substances 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The utility model relates to the technical field of carbon dioxide trapping, in particular to an oilfield associated gas carbon trapping system. Including light hydrocarbon recovery unit, light hydrocarbon recovery unit connects associated gas absorption tower air inlet, and associated gas absorption tower top is equipped with the pipeline of giving vent to anger, and associated gas absorption tower bottom is through first delivery pump, connects the inlet of absorbent regeneration tower through lean-rich liquid heat exchanger, and absorbent storage tank is connected through second delivery pump, lean-rich liquid heat exchanger, lean-rich liquid cooling heat exchanger to absorbent regeneration tower bottom, the shower head on associated gas absorption tower upper portion is connected through the third delivery pump to the absorbent storage tank, still includes the dry gas utilization system. The light hydrocarbon component is recovered through the light hydrocarbon recovery system, and then enters the carbon capture system to remove carbon dioxide, so that the removed dry gas reaches the natural gas product index. By using a small part of dry gas as a heat source of a gas steam boiler system of the carbon dioxide capturing device, the problem that a chemical absorption method of an oilfield associated gas treatment station in a remote area cannot be used is effectively solved.
Description
Technical Field
The utility model relates to the technical field of carbon dioxide trapping, in particular to an oilfield associated gas carbon trapping system.
Background
Oil field associated gas is used as a gas product in the crude oil exploitation process, and the dry gas is used as a natural gas product for external transportation after condensing and recovering light hydrocarbon components in the traditional oil exploitation process. In recent years, due to popularization and application of the carbon dioxide oil displacement technology, the content of carbon dioxide gas components in oilfield associated gas is greatly increased compared with that in the traditional oil extraction process. According to domestic petroleum exploitation process data, about 20% of carbon dioxide escapes from the stratum in the carbon dioxide oil displacement process, and the carbon dioxide gas returns to the ground along with crude oil.
Because the oilfield associated gas contains a higher concentration of carbon dioxide components, the carbon dioxide components cannot be condensed when passing through the condensation recovery device, so that the dry gas contains the higher concentration of carbon dioxide components, but the dry gas cannot be used as an index of natural gas products.
The method for removing carbon dioxide from the oilfield associated gas is more, and comprises a membrane separation method, a pressure swing adsorption method, a chemical absorption method and the like, wherein the chemical absorption method has the characteristics of strong adaptability and wide application range. At present, most of oilfield associated gas treatment stations are scattered in remote areas, and due to the lack of public engineering supporting facilities of an industrial park, low-pressure steam is required to be used as a heat source in the regeneration process of a chemical absorption method, so that the application of the chemical absorption method in part of oilfield associated gas treatment stations is limited to a certain extent.
Disclosure of Invention
The utility model provides an oilfield associated gas carbon capture system, which aims to solve the problem that a chemical absorption method cannot be used when an oilfield associated gas treatment station is located in a remote area.
In order to solve the problems, the technical scheme of the utility model is as follows:
the utility model discloses an oilfield associated gas carbon capture system, which comprises a light hydrocarbon recovery device, wherein the light hydrocarbon recovery device is connected with an air inlet of an associated gas absorption tower, an air outlet pipeline is arranged at the top of the associated gas absorption tower, the bottom of the associated gas absorption tower is connected with a liquid inlet of an absorbent regeneration tower through a first conveying pump and a lean-rich liquid heat exchanger, the bottom of the absorbent regeneration tower is connected with an absorbent storage tank through a second conveying pump, the lean-rich liquid heat exchanger and a lean-liquid cooling heat exchanger, and the absorbent storage tank is connected with a spray header at the upper part of the associated gas absorption tower through a third conveying pump.
The light hydrocarbon component is recovered through the light hydrocarbon recovery system, and then enters the carbon capture system to remove carbon dioxide, so that the removed dry gas reaches the natural gas product index.
The dry gas utilization system comprises a branch pipeline arranged on an outlet pipeline at the top of the associated gas absorption tower, and the branch pipeline is connected with the gas steam boiler system.
By using a small part of dry gas as a heat source of a gas steam boiler system of the carbon dioxide capturing device, the problem that a chemical absorption method of an oilfield associated gas treatment station in a remote area cannot be used is effectively solved.
The inlet of the gas steam boiler system is connected with a softening water pipe, the outlet of the gas steam boiler system is connected with a tower bottom reboiler, and a pipeline arranged at the tower bottom of the absorbent regeneration tower is connected with the lower part of the absorbent regeneration tower through the tower bottom reboiler.
And a pipeline is arranged at the top of the absorbent regeneration tower and is connected with the upper part of the absorbent regeneration tower through a gas-liquid separation device.
The gas-liquid separation device comprises a tower top condensation heat exchanger, the tower top condensation heat exchanger is connected with the top of the gas-liquid separation tank, and the bottom of the gas-liquid separation tank is connected with a fourth conveying pump.
The tower top condensation heat exchanger is connected with the tower top of the absorbent regeneration tower, and the fourth conveying pump is connected with the upper part of the absorbent regeneration tower.
Working principle: the method comprises the steps that oilfield associated gas in an oil extraction plant firstly enters a light hydrocarbon recovery device through pipeline transportation, the oilfield associated gas in the light hydrocarbon recovery device is subjected to compression and condensation to separate and recover light hydrocarbon components in the oilfield associated gas, the associated gas after light hydrocarbon recovery enters the lower part of an associated gas absorption tower through a pipeline, the associated gas is in countercurrent full contact with lean liquid absorbent from the upper part in a packing layer in the associated gas absorption tower, carbon dioxide in the associated gas is absorbed, dry gas after decarburization is discharged through an air outlet pipeline at the top of the associated gas absorption tower, most of the dry gas enters a natural gas transportation pipe network through the pipeline, and the rest of the dry gas is transported to a gas steam boiler system through a branch pipeline on the air outlet pipeline to be used as fuel.
Lean liquid absorbent from the third delivery pump is sprayed on the upper part of the associated gas absorption tower, and fresh chemical absorbent is continuously replenished. The rich liquid at the bottom of the associated gas absorption tower enters a lean-rich liquid heat exchanger through a first delivery pump, exchanges heat with the lean liquid from a second delivery pump, then enters an absorbent regeneration tower, and the cooled lean liquid enters a lean liquid cooling heat exchanger to exchange heat with industrial circulating cooling water to be cooled to 42 ℃. And the lean solution cooled by the lean solution cooling heat exchanger enters an absorbent storage tank, and then the lean solution absorbent enters the upper part of the associated gas absorption tower through a third conveying pump.
The gas phase at the top of the absorbent regeneration tower is subjected to heat exchange with industrial circulating cooling water through a tower top condensation heat exchanger and then enters a gas-liquid separation tank, the liquid phase of the gas-liquid separation tank returns to the upper part of the absorbent regeneration tower through a fourth conveying pump, and the gas phase of the gas-liquid separation tank is discharged into the atmosphere or enters a carbon dioxide recovery device for use.
The bottom of the absorbent regeneration tower is provided with a tower bottom reboiler, and low-pressure steam is used as energy supply. The low pressure steam is from a gas steam boiler system.
The beneficial effects of the utility model are as follows:
(1) According to the oilfield associated gas carbon capture system provided by the utility model, the light hydrocarbon component is recovered through the light hydrocarbon recovery system, and then the light hydrocarbon component enters the carbon capture system to remove carbon dioxide, so that the removed dry gas reaches the natural gas product index.
(2) The utility model effectively solves the problem that the chemical absorption method of the oilfield associated gas treatment station in the remote area cannot be used by using a small part of dry gas as a heat source of the gas-steam boiler system of the carbon dioxide capturing device.
(3) The utility model sets the absorbent storage tank for temporarily storing the absorbent, prevents the waste of the absorbent after the equipment stops running, and conveniently regulates and controls the flow to adapt to the process when the absorbent is transported to the associated gas absorption tower from the absorbent storage tank.
Drawings
In the drawings:
FIG. 1 is a schematic diagram of a carbon capture system for oilfield associated gas;
in the figure: 1. a light hydrocarbon recovery device; 2. an associated gas absorption tower; 3. a first transfer pump; 4. a lean rich liquid heat exchanger; 5. an absorbent regeneration tower; 6. a second transfer pump; 7. a lean solution cooling heat exchanger; 8. an absorbent storage tank; 9. a third transfer pump; 10. a bottom reboiler; 11. a gas steam boiler system; 12. a condensing heat exchanger at the top of the tower; 13. a gas-liquid separation tank; 14. and a fourth transfer pump.
Detailed Description
The utility model will be described in more detail with reference to examples.
As shown in fig. 1, the oilfield associated gas carbon capture system comprises a light hydrocarbon recovery device 1, the light hydrocarbon recovery device 1 is connected with an air inlet of an associated gas absorption tower 2, an air outlet pipeline is arranged at the top of the associated gas absorption tower 2, the bottom of the associated gas absorption tower 2 is connected with a liquid inlet of an absorbent regeneration tower 5 through a first conveying pump 3 and a lean-rich liquid heat exchanger 4, the bottom of the absorbent regeneration tower 5 is connected with an absorbent storage tank 8 through a second conveying pump 6, the lean-rich liquid heat exchanger 4 and a lean-liquid cooling heat exchanger 7, and the absorbent storage tank 8 is connected with a spray header at the upper part of the associated gas absorption tower 2 through a third conveying pump 9, and the oilfield associated gas carbon capture system further comprises a dry gas utilization system.
The light hydrocarbon component is recovered through the light hydrocarbon recovery system, and then enters the carbon capture system to remove carbon dioxide, so that the removed dry gas reaches the natural gas product index.
The dry gas utilization system comprises a branch pipeline which is arranged on an outlet pipeline at the top of the associated gas absorption tower 2 and is connected with the gas steam boiler system 11.
By using a small part of dry gas as a heat source of the gas steam boiler system 11 of the carbon dioxide capturing device, the situation that the chemical absorption method of the oilfield associated gas treatment station in a remote area cannot be used is effectively solved.
The inlet of the gas steam boiler system 11 is connected with a softening water pipe, the outlet is connected with a tower bottom reboiler 10, and a tower bottom opening pipeline of the absorbent regeneration tower 5 is connected with the lower part of the absorbent regeneration tower 5 through the tower bottom reboiler 10.
The top of the absorbent regeneration tower 5 is provided with a pipeline which is connected with the upper part of the absorbent regeneration tower 5 through a gas-liquid separation device.
The gas-liquid separation device comprises a tower top condensation heat exchanger 12, wherein the tower top condensation heat exchanger 12 is connected with the top of a gas-liquid separation tank 13, and the bottom of the gas-liquid separation tank 13 is connected with a fourth conveying pump 14.
The tower top condensation heat exchanger 12 is connected with the tower top of the absorbent regeneration tower 5, and the fourth conveying pump 14 is connected with the upper part of the absorbent regeneration tower 5.
Working principle: the oilfield associated gas of the oil extraction factory firstly enters the light hydrocarbon recovery device 1 through pipeline transportation, the oilfield associated gas in the light hydrocarbon recovery device 1 is compressed and condensed to separate and recycle the light hydrocarbon component in the oilfield associated gas, the associated gas after light hydrocarbon recovery enters the lower part of the associated gas absorption tower 2 through a pipeline, the associated gas is fully contacted with lean liquid absorbent from the upper part in countercurrent of a packing layer in the associated gas absorption tower 2, carbon dioxide in the associated gas is absorbed, the decarbonized dry gas is discharged through an air outlet pipeline at the top of the associated gas absorption tower 2, most of the dry gas enters a natural gas transportation pipe network through the pipeline, and the rest of the dry gas is transported to the gas steam boiler system 11 through a branch pipeline on the air outlet pipeline to be used as fuel.
Lean absorbent from the third transfer pump 9 is sprayed on the upper part of the associated gas absorption tower 2, and fresh chemical absorbent is continuously replenished. The rich liquid at the bottom of the associated gas absorption tower 2 enters a lean-rich liquid heat exchanger 4 through a first delivery pump 3, exchanges heat with the lean liquid from a second delivery pump 6, then enters an absorbent regeneration tower 5, and the cooled lean liquid enters a lean liquid cooling heat exchanger 7 to exchange heat with industrial circulating cooling water to be cooled to 42 ℃. The lean solution cooled by the lean solution cooling heat exchanger 7 enters the absorbent storage tank 8, and then the lean solution absorbent enters the upper part of the associated gas absorption tower 2 through the third delivery pump 9.
The gas phase at the top of the absorbent regeneration tower 5 is partially condensed with industrial circulating cooling water through a tower top condensation heat exchanger 12 and then enters a gas-liquid separation tank 13, the liquid phase of the gas-liquid separation tank 13 returns to the upper part of the absorbent regeneration tower 5 through a fourth conveying pump 14, and the gas phase of the gas-liquid separation tank 13 is discharged into the atmosphere or enters a carbon dioxide recovery device for use.
The bottom of the absorbent regeneration tower 5 is provided with a tower bottom reboiler 10, and low-pressure steam is used as energy supply. The low pressure steam is from the gas steam boiler system 11.
Claims (6)
1. The utility model provides an oilfield associated gas carbon entrapment system, its characterized in that, includes light hydrocarbon recovery unit (1), associated gas absorption tower (2) air inlet is connected to light hydrocarbon recovery unit (1), associated gas absorption tower (2) top is equipped with the pipeline of giving vent to anger, and absorbent regeneration tower (5) inlet is connected through first delivery pump (3), lean-rich liquid heat exchanger (4) in associated gas absorption tower (2) bottom, and absorbent storage tank (8) are connected through second delivery pump (6), lean-rich liquid heat exchanger (4), lean-lean liquid cooling heat exchanger (7) in absorbent regeneration tower (5) bottom, absorbent storage tank (8) are connected the shower head on associated gas absorption tower (2) upper portion through third delivery pump (9), still include dry gas utilization system.
2. The oilfield associated gas carbon capture system according to claim 1, wherein the dry gas utilization system comprises a branch pipeline arranged on an outlet pipeline at the top of the associated gas absorption tower (2), and the branch pipeline is connected with the gas steam boiler system (11).
3. The oilfield associated gas carbon capture system according to claim 2, wherein the inlet of the gas steam boiler system (11) is connected with a softening water pipe, the outlet is connected with a tower bottom reboiler (10), and the tower bottom opening pipeline of the absorbent regeneration tower (5) is connected back to the lower part of the absorbent regeneration tower (5) through the tower bottom reboiler (10).
4. The oilfield associated gas carbon capture system according to claim 1, wherein a pipeline is arranged at the top of the absorbent regeneration tower (5) and is connected back to the upper part of the absorbent regeneration tower (5) through a gas-liquid separation device.
5. The oilfield associated gas carbon capture system according to claim 4, wherein the gas-liquid separation device comprises a tower top condensation heat exchanger (12), the tower top condensation heat exchanger (12) is connected with the top of a gas-liquid separation tank (13), and the bottom of the gas-liquid separation tank (13) is connected with a fourth delivery pump (14).
6. The oilfield associated gas carbon capture system of claim 5, wherein the overhead condensing heat exchanger (12) is connected to an overhead of the absorbent regeneration tower (5), and the fourth transfer pump (14) is connected to an upper portion of the absorbent regeneration tower (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420239889.8U CN220554637U (en) | 2024-02-01 | 2024-02-01 | Oilfield associated gas carbon capture system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420239889.8U CN220554637U (en) | 2024-02-01 | 2024-02-01 | Oilfield associated gas carbon capture system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220554637U true CN220554637U (en) | 2024-03-05 |
Family
ID=90051573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420239889.8U Active CN220554637U (en) | 2024-02-01 | 2024-02-01 | Oilfield associated gas carbon capture system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220554637U (en) |
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2024
- 2024-02-01 CN CN202420239889.8U patent/CN220554637U/en active Active
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