CN219050843U - Carbon dioxide separation device and carbon dioxide trapping system - Google Patents
Carbon dioxide separation device and carbon dioxide trapping system Download PDFInfo
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- CN219050843U CN219050843U CN202223345904.7U CN202223345904U CN219050843U CN 219050843 U CN219050843 U CN 219050843U CN 202223345904 U CN202223345904 U CN 202223345904U CN 219050843 U CN219050843 U CN 219050843U
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- carbon dioxide
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- reboiler
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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Abstract
The utility model relates to a carbon dioxide separation device and a carbon dioxide capturing system, comprising: the regeneration tower, the middle part position is provided with lift cap and collector plate, and space about lift cap and the collector plate forms into operation space and lower operation space, is provided with second in operation space and the lower operation space respectively and sprays mechanism and first spraying mechanism, sprays organic amine rich solution in the lower operation space to heat through first reboiler, spray the lean solution that goes up by lower operation space extraction in the operation space, and heat through the second reboiler. The discharged carbon dioxide and water vapor are compressed and then supply heat to the second reboiler, so that the heat of the exhaust gas is effectively utilized. And the upper working space and the lower working space can form secondary heating of the organic amine, so that carbon dioxide in the organic amine is fully removed.
Description
Technical Field
The utility model belongs to the field of environmental protection, relates to a flue gas carbon dioxide trapping technology, and in particular relates to a carbon dioxide separation device and a carbon dioxide trapping system with the same.
Background
Carbon sequestration technology (CCS, carbon Capture and Storage) is becoming an important means of achieving substantial carbon abatement in the industry. The CCS process is shown in FIG. 1 and mainly comprises CO 2 Absorption of CO 2 Separation of desorbed and CO 2 Compression liquefaction, storage and sealing.
The main principle of CCS is to spray a certain amount of organic amine solution into CO 2 The absorbing tower, the absorbed rich solution containing carbon and organic amine enters the regenerating tower after heat exchange, and then the reboiler heats the rich solution by steam to make the rich solution in the regenerating tower to make CO with high concentration 2 Desorbing out and desorbing out CO 2 Along with the water vapor, the mixture passes through a gas-liquid separator to obtain high-purity CO 2 And after compression and liquefaction, sealing or utilizing the mixture.
The main problem with current CCS is that the energy consumption is too high, with most of the energy consumption being used for the aforementioned CO 2 Is a desorption and separation process of the catalyst. In the traditional process, the solution in the regeneration tower is reheated by only one reboiler, the same temperature (such as 110 ℃) is maintained, and the temperature required to be heated is different along with the difference of the carbon content of the organic amine, so that the process cannot adjust the steam amount according to specific requirements, and a great amount of waste of steam consumption is caused; on the other hand, a great amount of relatively low-temperature water vapor accompanies CO after the solution passes through the regeneration tower 2 The water vapor is discharged together, and is required to be cooled and separated and then compressed, so that the energy of the water vapor cannot be utilized, and a large amount of energy is wasted.
Thus, how CO is further enhanced by process innovations 2 The desorption efficiency and the improvement of the energy utilization rate are an important research direction for solving the problem of CCS energy consumption.
The problem of high energy consumption is usually solved by supplying other substances to be heated by using the high temperature of the exhaust gas or supplying the reboiler by using other heat sources. For example, in the chinese patent document "CN112933894a," carbon dioxide capture is coupled with low-pressure condensed water, "and the low-pressure condensed water is heated by the high temperature of the exhaust gas, so that the heat energy is effectively utilized. For example, the waste heat of the cement kiln is utilized to supply the reboiler in the Chinese patent document CN103372365A, so that separate steam is not required to be provided for the reboiler, and the use of the steam is saved. As in chinese patent document "CN105585015a", geothermal energy is supplied to the reboiler, and steam required for supplying the reboiler is also saved.
The chinese patent document "CN204952598U" uses the discharged hot gas to compress and then supply the compressed gas to the reboiler, and uses the high temperature of the compressed gas to heat the reboiler, which is a new idea, but there is still a disadvantage that two reboilers have a difference in heat supply capability due to different powers, so that they cannot cooperate well.
Disclosure of Invention
The utility model aims to provide a carbon dioxide separation device and a carbon dioxide capturing system, which solve the problem of how to save energy consumption.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a carbon dioxide separation device, which comprises:
the device comprises a regeneration tower, wherein an air lifting cap and a liquid collecting plate are arranged in the middle position in the regeneration tower, the upper space and the lower space of the air lifting cap and the liquid collecting plate are formed into an upper operation space and a lower operation space, a first spraying mechanism for spraying organic amine rich liquid is arranged at the top of the lower operation space, a second spraying mechanism for spraying organic amine lean liquid is arranged at the top of the upper operation space, and the second spraying mechanism is connected to the bottom of the regeneration tower through a lean liquid conveying pipeline;
the first reboiler is provided with a tube side and a shell side which can exchange heat, two ends of the shell side are respectively connected with a liquid collecting area at the bottom of the lower operation space and a space above the liquid collecting area, and the tube side is used for supplying steam from outside so as to heat liquid in the liquid collecting area of the lower operation space and release the heated liquid into the lower operation space;
the second reboiler is also provided with a tube side and a shell side which can exchange heat, and two ends of the shell side are respectively connected with a liquid collecting area at the bottom of the operation space and a space above the liquid collecting area;
and the compressor is connected between the discharge port at the top of the regeneration tower and the heat source supply port of the second reboiler, and is used for compressing the exhaust gas and supplying the compressed high-concentration carbon dioxide to a tube side in the second reboiler.
Preferably, a shell side outlet section for circulating lean liquid in the second reboiler is also connected with an organic amine lean liquid discharge bypass.
Preferably, a baffle mechanism is arranged below the first spraying mechanism and/or the second spraying mechanism, and the baffle mechanism comprises baffle plates which are distributed in a staggered way so as to lead sprayed liquid to flow downwards in a baffling way.
Preferably, the lean liquid conveying pipeline is also connected with an organic amine rich liquid supply pipeline through a heat exchanger so as to exchange heat.
There is also provided a carbon dioxide capture system comprising:
the aforementioned carbon dioxide separation device;
the absorption tower, the absorption tower top is provided with absorption liquid spraying mechanism, the absorption tower bottom with the first spraying mechanism in the regeneration tower is connected in order to supply with organic amine pregnant solution.
Preferably, the bottom of the absorption tower is also communicated with an air outlet of the booster fan.
Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:
according to the carbon dioxide separation device and the carbon dioxide capture system, the upper working space and the lower working space are arranged in the regeneration tower to form the two-stage working space, and the second reboiler of the upper working space utilizes the compressed exhaust gas to supply heat, so that the heat of the exhaust gas is effectively utilized, and the energy is saved. On the other hand, the organic amine rich liquid can be heated in the regeneration tower in a double way, namely, after being heated in the lower working space, the flowing lean liquid is transferred to the upper working space through the lean liquid conveying pipeline and is heated by the second reboiler in the upper working space, so that double heating is formed, and the carbon dioxide is more fully removed.
The regeneration tower is internally provided with two stages of operation spaces, the second reboiler is only arranged in the upper operation space, and the heat required by heating lean liquid in the operation space is less.
Drawings
Some specific embodiments of the utility model will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
FIG. 1 is a schematic diagram of a prior art carbon dioxide capture system;
FIG. 2 is a schematic view of the structure of a preferred embodiment of the carbon dioxide separation apparatus of the present utility model;
FIG. 3 is a schematic diagram of the structure of a preferred embodiment of the carbon dioxide capture system of the present utility model;
wherein reference numerals are as follows:
1. an absorption tower;
2. a regeneration tower; 21. an air lifting cap; 22. an upper working space; 23. a lower working space; 24. a liquid collecting plate;
3. a first spray mechanism;
4. a second spraying mechanism;
5. a lean liquid conveying pipeline;
6. a first reboiler;
7. a second reboiler;
8. a compressor;
9. an organic amine lean liquid discharge bypass;
10. a baffle mechanism; 101. a baffle plate;
11. a heat exchanger;
12. an organic amine rich liquid supply line;
13. an absorption liquid spraying mechanism;
14. a booster fan;
15. a reboiler;
16. desulfurizing flue gas;
17. a high-concentration carbon dioxide discharge pipe;
18. a steam inlet;
19. a steam outlet.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, in the prior art, the flue gas is introduced into an absorption tower 1 through a booster fan 14, an absorption liquid spraying mechanism 13 sprays an alcohol amine solution into the absorption tower 1, and carbon dioxide in the flue gas is fully contacted with the alcohol amine solution and absorbed by the alcohol amine solution in the rising process. The alcohol amine solution absorbs carbon dioxide to form an organic amine rich solution, the organic amine rich solution flows to the bottom of the absorption tower 1, the organic amine rich solution is conveyed to the regeneration tower 2 through an organic amine rich solution supply pipeline 12, and the reboiler 15 absorbs the organic amine rich solution with a liquid collecting area at the bottom of the regeneration tower 2 and heats the organic amine rich solution by utilizing steam. The carbon dioxide removed after heating rises to the top of the regeneration tower 2 and is discharged, cooled, compressed and liquefied and then stored.
The carbon dioxide separation apparatus of this example is shown in fig. 2, as opposed to the right half of fig. 1. The main difference from the structure of fig. 1 is that two stages of working spaces, namely an upper working space 22 and a lower working space 23, are provided in the regeneration tower 2, and two reboilers, namely a first reboiler 6 and a second reboiler 7, are provided.
The middle part inside the regeneration tower 2 is provided with an air lifting cap 21 and a liquid collecting plate 24. The lift cap 21 and the header plate 24 divide the internal space of the regeneration tower 2 into an upper working space 22 and a lower working space 23.
The organic amine rich liquid supply pipeline 12 is communicated with the first spraying mechanism 3 in the lower working space 23, the first spraying mechanism 3 transversely extends to the top of the lower working space 23, and the first spraying mechanism 3 sprays the organic amine rich liquid into the lower working space 23. The organic amine rich liquid is sprayed to form a drop shape or a mist shape, and the contact area with rising hot gas is larger, thereby being beneficial to the removal of carbon dioxide.
The baffle mechanism 10 is arranged below the first spraying mechanism 3, the baffle mechanism 10 comprises baffle plates 101 which are distributed in a staggered way, and the baffle plates 101 form an S-shaped channel, so that the organic amine rich liquid flows downwards in a baffling way, the flowing path of the organic amine rich liquid is prolonged, the contact time of the organic amine rich liquid and the upward flowing hot gas is prolonged, the organic amine rich liquid is fully heated, and carbon dioxide in the organic amine rich liquid is fully removed.
A first reboiler 6 is provided corresponding to the lower working space 23. The first reboiler 6 has a tube side and a shell side capable of exchanging heat, wherein both ends of the shell side are connected to a liquid collecting zone at the bottom of the lower working space 23 and a space above the liquid collecting zone, respectively. The organic amine rich liquid flows to a liquid collecting area at the bottom of the lower working space 23, the organic amine rich liquid is extracted to a shell side of the liquid collecting area by the first reboiler 6, steam is introduced into the tube side of the first reboiler 6 through a steam inlet 18, the steam heats the organic amine rich liquid, cooled steam and condensed water flow out from a steam outlet 19, and the heated organic amine rich liquid is released into the lower working space 23. The shell side and tube side of the first reboiler 6 may also be interchanged, for example, steam may be introduced into the shell side and an organic amine solution may be introduced into the tube side. The second reboiler 7 is the same as described below.
The bottom of the lower working space 23 is also communicated with the second spraying mechanism 4 in the upper working space 22 through the lean liquid conveying pipeline 5. The lean solution (organic amine after removing part of carbon dioxide) in the liquid collecting area at the bottom of the lower working space 23 is conveyed into the second spraying mechanism 4 by the conveying pump in the lean solution conveying pipeline 5, and is sprayed into the upper working space 22 by the second spraying mechanism 4. A baffle mechanism 10 is also arranged below the second spraying mechanism 4, the baffle mechanism 10 comprises baffle plates 101 which are distributed in a staggered way, and the baffle plates 101 also form an S-shaped channel so as to prolong the flow path of sprayed lean liquid.
As shown in fig. 2, the collector plate 24 extends obliquely upward from the periphery of the inner wall of the regeneration tower 2 to below the periphery of the lift cap 21, like a truncated cone. The cap 21 resembles a conical surface with its periphery covering over the header plate 24 and extending outwardly a small distance and its top end converging upwardly into a tip. A passage for hot gas to rise is formed between the lift cap 21 and the header plate 24, and the organic amine lean liquid falling above flows to a liquid collecting region formed between the header plate 24 and the inner wall of the regeneration tower 2 under the guide of the lift cap 21.
A second reboiler 7 is provided corresponding to the upper working space 22. The second reboiler 7 has a tube side and a shell side, and both ends of the shell side are respectively connected to a liquid collecting region between the liquid collecting plate 24 and the inner wall of the regeneration tower 2 and a space above the liquid collecting region. The second reboiler 7 extracts lean liquid from the liquid collecting region and heats the lean liquid, the heated liquid returns to the upper working space 22, and the removed carbon dioxide rises in the upper working space 22.
The carbon dioxide-containing hot gas in the lower working space 23 and the upper working space 22 are both discharged into the compressor 8, the compressor 8 is a screw compressor, and the hot gas is heated in the compressor 8 in a pressurizing way and then flows back to the tube side of the second reboiler 7, so that the organic amine lean liquid in the shell side of the second reboiler 7 is heated. The heat of the discharged gas is utilized for the second reboiler 7, which is beneficial to saving energy.
As shown in fig. 2, an organic amine lean solution discharge bypass 9 is also connected to the shell side outlet section of the second reboiler 7 for circulating lean solution, thereby discharging a part of the organic amine lean solution. The high-concentration carbon dioxide in the tube side of the second reboiler 7 is discharged and collected through a high-concentration carbon dioxide discharge tube 17.
The lean liquid delivery pipe 5 is also connected to the organic amine rich liquid supply pipe 12 through a heat exchanger 11 so as to perform heat exchange, and the lean liquid heated in the lean liquid delivery pipe 5 is used to heat the cold rich liquid in the organic amine rich liquid supply pipe 12.
The carbon dioxide capturing system shown in fig. 3 includes the aforementioned carbon dioxide separation device and absorption tower 1. The bottom of the absorption tower 1 is connected with the first spraying mechanism 3 in the regeneration tower 2 through an organic amine rich liquid supply pipeline 12 to supply the organic amine rich liquid. The bottom of the absorption tower 1 is also connected with an air outlet of a booster fan 14, so that the flue gas is blown into the absorption tower 1.
The carbon dioxide separation device and the carbon dioxide capturing system of the present example are used for CO of 3500kw high-power engine exhaust gas 2 The trapping and sealing are provided with two smaller reboilers, namely a first reboiler 6 and a second reboiler 7, wherein the heat source of the second reboiler 7 is changed from external water vapor into compressed CO generated in the self process 2 And water vapor, the energy consumption is reduced by more than 20%, and meanwhile, a series of cooling and separating processes for the outlet of the regeneration tower 2 are reduced, the compression process flow is optimized, and the compression efficiency is improved.
The above embodiments are only for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the present utility model and to implement the same, but are not intended to limit the scope of the present utility model, and all equivalent changes or modifications made according to the spirit of the present utility model should be included in the scope of the present utility model.
Claims (6)
1. A carbon dioxide separation device, comprising:
the device comprises a regeneration tower (2), wherein an air lifting cap (21) and a liquid collecting plate (24) are arranged in the middle position in the regeneration tower (2), the upper and lower spaces of the air lifting cap (21) and the liquid collecting plate (24) are formed into an upper operation space (22) and a lower operation space (23), a first spraying mechanism (3) for spraying organic amine rich liquid is arranged at the top of the lower operation space (23), a second spraying mechanism (4) for spraying organic amine lean liquid is arranged at the top of the upper operation space (22), and the second spraying mechanism (4) is connected to the bottom of the regeneration tower (2) through a lean liquid conveying pipeline (5);
the first reboiler (6) is provided with a tube side and a shell side which can exchange heat, two ends of the shell side are respectively connected with a liquid collecting area at the bottom of the lower operation space (23) and a space above the liquid collecting area, and the tube side is used for supplying steam from outside so as to heat liquid in the liquid collecting area of the lower operation space (23) and then release the heated liquid into the lower operation space (23);
the second reboiler (7) is also provided with a tube side and a shell side which can exchange heat, and two ends of the shell side are respectively connected with a liquid collecting area at the bottom of the operation space (22) and a space above the liquid collecting area;
and the compressor (8) is connected between the discharge port at the top of the regeneration tower (2) and the heat source supply port of the second reboiler (7) and is used for compressing the discharged gas and supplying the compressed high-concentration carbon dioxide to a tube side in the second reboiler (7).
2. The carbon dioxide separation device according to claim 1, wherein: the shell side outlet section of the second reboiler (7) for circulating lean liquid is also connected with an organic amine lean liquid discharge bypass (9).
3. The carbon dioxide separation device according to claim 1, wherein: the baffle mechanisms (10) are arranged below the first spraying mechanism (3) and/or the second spraying mechanism (4), and the baffle mechanisms (10) comprise baffle plates (101) which are distributed in a staggered manner so as to lead sprayed liquid to flow downwards in a baffling way.
4. The carbon dioxide separation device according to claim 1, wherein: the lean liquid conveying pipeline (5) is also connected with an organic amine rich liquid supply pipeline (12) through a heat exchanger (11) so as to exchange heat.
5. A carbon dioxide capture system, comprising:
the carbon dioxide separation device of any one of claims 1 to 4;
the absorption tower (1), absorption tower (1) top is provided with absorption liquid spraying mechanism (13), absorption tower (1) bottom with first spraying mechanism (3) in regeneration tower (2) are connected in order to supply organic amine pregnant solution.
6. The carbon dioxide capture system of claim 5, wherein: the bottom of the absorption tower (1) is also communicated with an air outlet of a booster fan (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223345904.7U CN219050843U (en) | 2022-12-14 | 2022-12-14 | Carbon dioxide separation device and carbon dioxide trapping system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223345904.7U CN219050843U (en) | 2022-12-14 | 2022-12-14 | Carbon dioxide separation device and carbon dioxide trapping system |
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| Publication Number | Publication Date |
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| CN219050843U true CN219050843U (en) | 2023-05-23 |
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| CN202223345904.7U Active CN219050843U (en) | 2022-12-14 | 2022-12-14 | Carbon dioxide separation device and carbon dioxide trapping system |
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| CN (1) | CN219050843U (en) |
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