Carbon dioxide trapping device

Abstract

The invention provides a carbon dioxide trapping device, which comprises: an absorption tower provided with a first gas inlet, a first gas outlet and a first liquid inlet, the first gas inlet and the first gas outlet are arranged at an interval, and the first liquid inlet is arranged at the upper part of the absorption tower and is used for the entry of an organic amine absorbent; the pickling tower is provided with a second gas inlet, a second gas outlet and a second liquid inlet which are arranged at intervals, and the second gas inlet is communicated with the first gas outlet; the acid storage tank is communicated with the second liquid inlet. According to the technical scheme, the problem that in the related technology, when an organic amine absorbent is used for removing carbon dioxide, the concentration of ammonia gas in exhausted flue gas is high is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide capture, and in particular to a carbon dioxide capture device. Background Art

[0002] In the power industry, especially in coal-fired power plants, carbon dioxide capture technology has received widespread attention and application as a key means to reduce greenhouse gas emissions. Among them, the chemical absorption method based on organic amines is one of the mature and widely used carbon dioxide capture technologies. This method uses organic amines (such as monoethanolamine MEA, diethanolamine DEA, etc.) to absorb carbon dioxide in flue gas, thereby achieving the capture and separation of carbon dioxide. Although the organic amine absorption method shows high efficiency in carbon dioxide capture, there are also some problems that cannot be ignored in the actual operation process, especially related to ammonia escape.

[0003] When the high-temperature flue gas generated during coal-fired power generation passes through the carbon capture system, the carbon dioxide in the flue gas contacts the organic amine absorbent and is absorbed. However, due to the high temperature during the absorption process and the volatility of the organic amine, some of the organic amine will degrade and produce ammonia. Ammonia is a highly volatile gas that can quickly dissolve in water. However, in the carbon capture system, due to the influence of various factors such as air flow velocity, temperature changes and pressure fluctuations, some ammonia that is not absorbed by the liquid will be discharged into the atmosphere along with the flue gas. The escaped ammonia poses a serious threat to the environment and human health. Ammonia is highly irritating and toxic. Long-term exposure to a high concentration of ammonia will cause damage to the respiratory system and eyes of power plant workers. In addition, after ammonia is discharged into the atmosphere, it is easy to react with air pollutants such as sulfur dioxide and nitrogen oxides to form fine particulate matter (PM2.5), aggravating air pollution and causing long-term negative impacts on human health and the ecological environment. Summary of the invention

[0004] The main purpose of the present invention is to provide a carbon dioxide capture device to solve the problem in the related art that when an organic amine absorbent is used to remove carbon dioxide, the ammonia concentration in the exhausted flue gas is relatively high.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a carbon dioxide capture device, comprising: an absorption tower, having a first gas inlet, a first gas outlet and a first liquid inlet, the first gas inlet and the first gas outlet being arranged at intervals, the first liquid inlet being arranged at the upper part of the absorption tower and being used for the entry of an organic amine absorbent; an acid washing tower, the acid washing tower having a second gas inlet, a second gas outlet and a second liquid inlet being arranged at intervals, the second gas inlet being connected to the first gas outlet; and an acid storage tank, the acid storage tank being connected to the second liquid inlet.

[0006] Furthermore, sulfuric acid is stored in the acid storage tank.

[0007] Further, the pH value of sulfuric acid is between 4 and 6.

[0008] Furthermore, the pickling tower includes a first tower body and a first packing section arranged in the first tower body.

[0009] Furthermore, the pickling tower also includes a first demister arranged in the first tower body, and the first demister is arranged above the first packing section.

[0010] Furthermore, the height of the first filling section is between 3 meters and 4 meters.

[0011] Furthermore, the absorption tower includes a second tower body, a second packing section and a third packing section, the second packing section and the third packing section are arranged in the second tower body, the third packing section is arranged below the second packing section, and the carbon dioxide capture device also includes a first heat exchanger, which is connected between the bottom of the second packing section and the top of the third packing section.

[0012] Furthermore, the absorption tower also includes a fourth packing section, a second demister and a nozzle arranged in the second tower body, the second demister is arranged above the fourth packing section, the second packing section is arranged below the fourth packing section, and the nozzle is arranged between the fourth packing section and the second demister.

[0013] Furthermore, the carbon dioxide capture device also includes a desorption tower and a gas-liquid separator. The absorption tower also has a first liquid outlet, which is connected to the desorption tower. The gas-liquid separator has a second liquid outlet, which is connected to the first liquid inlet.

[0014] Furthermore, the carbon dioxide capture device also includes a second heat exchanger, and the second heat exchanger is connected between the first liquid outlet and the desorption tower.

[0015] Applying the technical solution of the present invention, the carbon dioxide capture device includes an absorption tower, a pickling tower and an acid storage tank. The absorption tower has a first gas inlet and a first gas outlet arranged at intervals. The absorption tower also has a first liquid inlet arranged at the upper part of the absorption tower, and the first liquid inlet is used for the entry of an organic amine absorbent. The pickling tower has a second gas inlet, a second gas outlet and a second liquid inlet, and the second gas inlet, the second gas outlet and the second liquid inlet are arranged at intervals, and the second gas inlet is connected to the first gas outlet. The acid storage tank is connected to the second liquid inlet. Through the above-mentioned arrangement, the flue gas can enter the absorption tower from the first gas inlet, flow out of the absorption tower through the second gas outlet, then enter the pickling tower through the second gas inlet, and finally flow out of the pickling tower. When the flue gas is in the absorption tower, the flue gas can react with the organic amine absorbent entering the absorption tower from the first liquid inlet, thereby being able to remove carbon dioxide in the flue gas. When the flue gas flows, it will carry away ammonia generated by the degradation of the organic amine absorbent and flow into the acid washing tower. After the ammonia reacts with water, it reacts with the acid flowing into the acid washing tower, thereby removing the ammonia carried away and reducing the ammonia concentration in the flue gas. Therefore, the technical solution of the present application effectively solves the problem of high ammonia concentration in the exhaust flue gas when using an organic amine absorbent to remove carbon dioxide in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram showing a principle of an embodiment of a carbon dioxide capture device according to the present invention is shown;

[0018] Figure 2 Shows Figure 1 A schematic diagram of the three-dimensional structure of the first packing section of the carbon dioxide capture device;

[0019] Figure 3 Shows Figure 2 A schematic cross-sectional view of a first packing section;

[0020] Figure 4 Shows Figure 2 A schematic cross-sectional view from another perspective of the first filling section.

[0021] The above drawings include the following reference numerals:

[0022] 10. Absorption tower; 11. First gas inlet; 12. First gas outlet; 13. First liquid inlet; 14. Second tower body; 15. Second packing section; 16. Third packing section; 17. Fourth packing section; 18. Second demister; 19. First liquid outlet; 20. Pickling tower; 21. Second gas inlet; 22. Second gas outlet; 23. Second liquid inlet; 24. First tower body; 25. First packing section; 251. First folded plate; 2511. First plate section; 2512. Second plate section; 2513. First Three plate sections; 25131, the first flow hole; 2514, the fourth plate section; 252, the second folding plate; 2521, the fifth plate section; 25211, the second flow hole; 2522, the sixth plate section; 2523, the seventh plate section; 2524, the eighth plate section; 26, the first demister; 30, the acid storage tank; 40, the first heat exchanger; 50, the desorption tower; 60, the gas-liquid separator; 61, the second liquid outlet; 70, the second heat exchanger; 80, the filtering device; 90, the precipitation device; 100, the centrifugal device; 110, the drying device. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0026] like Figure 1 As shown, the carbon dioxide capture device of this embodiment includes: an absorption tower 10, a pickling tower 20 and an acid storage tank 30. The absorption tower 10 has a first gas inlet 11, a first gas outlet 12 and a first liquid inlet 13, the first gas inlet 11 and the first gas outlet 12 are arranged at intervals, and the first liquid inlet 13 is arranged at the upper part of the absorption tower 10 and is used for the entry of the absorbent. The pickling tower 20 has a second gas inlet 21, a second gas outlet 22 and a second liquid inlet 23 arranged at intervals, and the second gas inlet 21 is connected to the first gas outlet 12. The acid storage tank 30 is connected to the second liquid inlet 23.

[0027] Applying the technical solution of this embodiment, the carbon dioxide capture device includes an absorption tower 10, a pickling tower 20 and an acid storage tank 30. The absorption tower 10 has a first gas inlet 11 and a first gas outlet 12 arranged at intervals. The absorption tower 10 also has a first liquid inlet 13 arranged at the upper part of the absorption tower 10, and the first liquid inlet 13 is used for the entry of an organic amine absorbent. The pickling tower 20 has a second gas inlet 21, a second gas outlet 22 and a second liquid inlet 23, and the second gas inlet 21, the second gas outlet 22 and the second liquid inlet 23 are arranged at intervals, and the second gas inlet 21 is connected to the first gas outlet 12. The acid storage tank 30 is connected to the second liquid inlet 23. Through the above-mentioned arrangement, the flue gas can enter the absorption tower 10 from the first gas inlet 11, flow out of the absorption tower 10 through the second gas outlet 22, then enter the pickling tower 20 through the second gas inlet 21, and finally flow out of the pickling tower 20. When the flue gas is in the absorption tower 10, the flue gas can react with the organic amine absorbent entering the absorption tower 10 from the first liquid inlet 13, thereby removing carbon dioxide from the flue gas. When the flue gas flows, it will carry away ammonia generated by the degradation of the organic amine absorbent and flow into the acid washing tower 20. After the ammonia reacts with water, it reacts with the acid flowing into the acid washing tower, thereby removing the ammonia carried away, reducing the ammonia concentration in the flue gas. Therefore, the technical solution of this embodiment effectively solves the problem of high ammonia concentration in the discharged flue gas when using an organic amine absorbent to remove carbon dioxide in the related art.

[0028] It should be noted that the first liquid inlet 13 is disposed at the upper portion of the absorption tower 10 means that the first liquid inlet 13 is disposed at a position above the center plane of the absorption tower 10 .

[0029] like Figure 1 As shown, in this embodiment, sulfuric acid is stored in the acid storage tank 30. Under the action of water and sulfuric acid, ammonia mixed in the flue gas can be removed.

[0030] Sulfuric acid is dilute sulfuric acid.

[0031] like Figure 1 As shown, in this embodiment, the pH value of sulfuric acid is between 4 and 6. Through the above arrangement, ammonia mixed in the flue gas can be effectively removed.

[0032] like Figures 1 to 4 As shown, in this embodiment, the pickling tower 20 includes a first tower body 24 and a first packing section 25 disposed in the first tower body 24. By providing the first packing section 25, sulfuric acid can be more fully contacted with ammonia, thereby ensuring the removal effect of ammonia.

[0033] The first filling section 25 includes a first folding plate 251 and a second folding plate 252 that are spaced apart from each other. The first folding plate 251 is located below the second folding plate 252 .

[0034] The first folding plate 251 includes a first plate segment 2511, a second plate segment 2512, a third plate segment 2513 and a fourth plate segment 2514 connected in sequence, and a plurality of first flow holes 25131 are arranged on the third plate segment 2513. An obtuse angle is formed between the first plate segment and the second plate segment. An obtuse angle is formed between the second plate segment and the third plate segment. An obtuse angle is formed between the third plate segment and the fourth plate segment. The third plate segment is higher than the first plate segment, and the third plate segment and the first plate segment are both arranged in the horizontal direction.

[0035] The second folding plate 252 includes a fifth plate segment 2521, a sixth plate segment 2522, a seventh plate segment 2523 and an eighth plate segment 2524 connected in sequence, and a plurality of second flow holes 25211 are arranged on the fifth plate segment 2521. An obtuse angle is formed between the fifth plate segment and the sixth plate segment. An obtuse angle is formed between the sixth plate segment and the seventh plate segment. An obtuse angle is formed between the seventh plate segment and the eighth plate segment. The seventh plate segment is higher than the fifth plate segment, and the seventh plate segment and the fifth plate segment are both arranged in the horizontal direction.

[0036] The angle between the second plate segment 2512 and the first plate segment 2511 is smaller than the angle between the fifth plate segment 2521 and the sixth plate segment 2522, and the first plate segment 2511 is arranged in parallel with the fifth plate segment 2521. The sixth plate segment 2522 and the eighth plate segment 2524 are arranged symmetrically about the seventh plate segment 2523. The second plate segment 2512 and the fourth plate segment 2514 are arranged symmetrically about the third plate segment 2513.

[0037] The flue gas enters the gap between the third plate segment 2513 and the fourth plate segment 2514 through the first flow hole 25131, and then diffuses to the gap between the second plate segment 2512 and the sixth plate segment 2522 and the gap between the fourth plate segment 2514 and the eighth plate segment 2524. Sulfuric acid enters the gap between the fifth plate segment 2521 and the first plate segment 2511 through the second flow hole 25211, and then the flue gas can react with the sulfuric acid to remove ammonia in the flue gas.

[0038] In the direction from the second folded plate 252 to the first folded plate 251, the aperture of the second flow hole 25211 gradually increases, so that after the sulfuric acid enters the gap between the fifth plate segment 2521 and the first plate segment 2511, the movement rate can be slowed down, which is conducive to full contact with the flue gas.

[0039] In the direction from the first folded plate 251 to the second folded plate 252, the aperture of the first flow hole 25131 gradually increases, which can increase the rate at which the gas enters the gap between the third plate segment 2513 and the fourth plate segment 2514, thereby facilitating rapid diffusion of the gas.

[0040] The flue gas containing a small amount of organic amine and ammonia reacts with sulfuric acid in reverse contact on the surface of the first packing section 25. After entering the liquid phase, the ammonia combines with water to form monohydrated ammonia, which is neutralized by sulfuric acid, resulting in a decrease in its concentration in the liquid phase, which promotes the continued combination of ammonia and water, reduces the concentration of dissolved ammonia in the liquid phase, increases the gas-liquid mass transfer dynamics, and improves the removal efficiency. Sulfuric acid is adiabatically circulated in the pickling tower and is supplemented through the acid storage tank when the concentration is too low.

[0041] like Figure 1 As shown, in this embodiment, the pickling tower 20 further includes a first demister 26 disposed in the first tower body 24, and the first demister 26 is disposed above the first packing section 25. The first demister 26 can effectively remove droplets in the flue gas, prevent liquid from being brought into subsequent equipment, and improve the stability and safety of the system.

[0042] like Figure 1 As shown, in this embodiment, the height of the first filling section 25 is between 3 meters and 4 meters. The above arrangement ensures that ammonia and sulfuric acid have sufficient contact time, thereby improving the removal effect of ammonia.

[0043] like Figure 1 As shown, in this embodiment, the absorption tower 10 includes a second tower body 14, a second packing section 15 and a third packing section 16, the second packing section 15 and the third packing section 16 are arranged in the second tower body 14, and the third packing section 16 is arranged below the second packing section 15. The carbon dioxide capture device also includes a first heat exchanger 40, and the first heat exchanger 40 is connected between the bottom of the second packing section 15 and the top of the third packing section 16. By setting the second packing section 15 and the third packing section 16, the contact area between the flue gas and the organic amine absorbent can be increased to ensure the removal effect of carbon dioxide. By setting the first heat exchanger 40, the temperature of the organic amine absorbent can be effectively reduced, so that the organic amine absorbent after cooling can re-enter the second tower body 14 and remove carbon dioxide, thereby improving the utilization rate of the organic amine absorbent.

[0044] The first heat exchanger 40 is a water-cooled heat exchanger.

[0045] The absorbent after absorbing carbon dioxide on the surface of the second packing section 15 is cooled by the first heat exchanger 40 and then pumped into the third packing section 16 to improve the carbon dioxide removal efficiency. The flue gas after the removal of carbon dioxide will carry some organic amines and ammonia generated by their degradation, which flow upward with the flue gas into the water washing section of the absorption tower 10.

[0046] like Figure 1As shown, in this embodiment, the absorption tower 10 also includes a fourth packing section 17, a second demister 18 and a nozzle arranged in the second tower body 14, the second demister 18 is arranged above the fourth packing section 17, the second packing section 15 is arranged below the fourth packing section 17, and the nozzle is arranged between the fourth packing section 17 and the second demister 18. The flue gas containing organic amines and ammonia contacts water in reverse on the fourth packing section 17, and most of the organic amines and part of the ammonia are absorbed by water. The second demister 18 can remove droplets in the flue gas to prevent liquid from being brought into subsequent equipment, thereby improving the stability and safety of the system. The nozzle can spray out the organic amine absorbent.

[0047] The fourth packing section 17 and the bottom of the second demister 18 are communicated with the third heat exchanger, and the fourth packing section 17 is communicated with the second heat exchanger.

[0048] The flue gas containing organic amine and ammonia contacts water in reverse on the fourth packing section 17, and most of the organic amine and part of the ammonia are absorbed by the water. The solution collected by the second demister 18 after absorption is cooled by the second heat exchanger and reused. After reaching a certain concentration, it is pumped into the absorption tower 10. The treated flue gas flows upward into the acid washing tower 20.

[0049] like Figure 1 As shown, in this embodiment, the carbon dioxide capture device further includes a desorption tower 50 and a gas-liquid separator 60, the absorption tower 10 further has a first liquid outlet 19, the first liquid outlet 19 is connected to the desorption tower 50, and the gas-liquid separator 60 has a second liquid outlet 61, and the second liquid outlet 61 is connected to the first liquid inlet 13. By providing the desorption tower 50, carbon dioxide can be separated from the organic amine absorbent. By providing the gas-liquid separator 60, carbon dioxide can be separated and the purity of the discharged carbon dioxide can be improved.

[0050] like Figure 1 As shown, in this embodiment, the carbon dioxide capture device further includes a second heat exchanger 70, which is connected between the first liquid outlet 19 and the desorption tower 50. By providing the second heat exchanger 70, the heat of the lean liquid can be reduced before entering the absorption tower 10 to react with carbon dioxide.

[0051] The second heat exchanger 70 is a lean-rich liquid heat exchanger.

[0052] The organic amine absorbent that absorbs and enriches carbon dioxide is called rich liquid. After heat exchange with lean liquid in the second heat exchanger 70, it is pumped into the top of the desorption tower 50, and reacts with the hot steam from bottom to top on the surface of the fifth packing section of the desorption tower 50 to desorb carbon dioxide. The desorbed high-purity carbon dioxide is separated by the gas-liquid separator and then collected and stored. The heat required for the desorption process is provided by the reboiler.

[0053] The carbon dioxide capture device also includes an ammonium sulfate fertilizer production line, which is mainly composed of a filtering device 80, a precipitation device 90, a centrifugal device 100 and a drying device 110. The raw material of the production line is the ammonium sulfate waste liquid generated after the dilute sulfuric acid absorbs ammonia in the pickling tower 20. First, the undersaturated ammonium sulfate waste liquid discharged from the pickling tower 20 is filtered out of impurities by the filtering device, and then enters the precipitation device 90 for concentration and precipitation. The ammonium sulfate crystals produced are the main component of the fertilizer. The ammonium sulfate crystals are dehydrated by the centrifugal device 100, and then dried by the drying device 110, and finally packaged as finished products, which can be sold and used.

[0054] Water washing technology is a commonly used ammonia escape control technology. This technology uses water as an absorbent and does not have a packing section. Therefore, the gas-liquid mass transfer resistance is large, and the control effect on ammonia escape is poor. In contrast, the carbon dioxide capture device of the present embodiment uses dilute sulfuric acid with a pH of 4 to 6 as an absorbent, and a polymer (or ceramic) packing section with a height of 3 to 4 meters is added. The gas-liquid mass transfer effect of the system is improved by comprehensive chemical and physical means, and the ammonia concentration in the exhaust flue gas is reduced. The concentration of ammonia hydrates on the surface of the liquid phase is continuously neutralized and reduced by dilute sulfuric acid, the gas-liquid mass transfer power is improved, and the gas-liquid mass transfer process is accelerated by chemical means. At the same time, the additional polymer (or ceramic) packing section can increase the gas-liquid contact area and improve the gas-liquid mass transfer capacity of the system by physical means. In view of the resource value of ammonia, the ammonium sulfate waste liquid generated by the absorption of ammonia by dilute sulfuric acid in the pickling tower is filtered, precipitated, centrifuged and dried, and its resource is converted into ammonium sulfate fertilizer. This process not only greatly reduces the amount of waste liquid to be processed in the system, but also significantly improves the economic benefits.

[0055] The carbon dioxide capture device of this embodiment has the following advantages:

[0056] 1. A two-stage structure of water washing and acid washing is used to control the ammonia escape problem of the carbon capture system.

[0057] 2. Use chemical means to accelerate the gas-liquid mass transfer process through dilute sulfuric acid with a pH value between 4 and 6.

[0058] 3. A packing section with a height of 3 to 4 meters was added to the pickling tower to improve the gas-liquid mass transfer capacity of the system through physical means.

[0059] 4. An additional acid storage tank 30 is provided to improve the economy of pickling treatment.

[0060] 5. The waste liquid generated after pickling is recycled to produce ammonium sulfate fertilizer. There is no waste discharge in the whole process, which is green and environmentally friendly.

[0061] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0062] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0063] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A carbon dioxide capture device, characterized in that: include: An absorption tower (10) having a first gas inlet (11), a first gas outlet (12) and a first liquid inlet (13), wherein the first gas inlet (11) and the first gas outlet (12) are arranged at intervals, and the first liquid inlet (13) is arranged at the upper part of the absorption tower (10) and is used for the entry of an organic amine absorbent; A pickling tower (20), the pickling tower (20) having a second gas inlet (21), a second gas outlet (22) and a second liquid inlet (23) arranged at intervals, the second gas inlet (21) being in communication with the first gas outlet (12); An acid storage tank (30), wherein the acid storage tank (30) is in communication with the second liquid inlet (23).

2. The carbon dioxide capture device according to claim 1, characterized in that: The acid storage tank (30) stores sulfuric acid.

3. The carbon dioxide capture device according to claim 2, characterized in that: The pH value of the sulfuric acid is between 4 and 6.

4. The carbon dioxide capture device according to claim 1, characterized in that: The pickling tower (20) comprises a first tower body (24) and a first packing section (25) arranged in the first tower body (24).

5. The carbon dioxide capture device according to claim 4, characterized in that: The pickling tower (20) further comprises a first demister (26) arranged in the first tower body (24), wherein the first demister (26) is arranged above the first packing section (25).

6. The carbon dioxide capture device according to claim 4, characterized in that: The height of the first filling section (25) is between 3 meters and 4 meters.

7. The carbon dioxide capture device according to any one of claims 1 to 6, characterized in that: The absorption tower (10) comprises a second tower body (14), a second packing section (15) and a third packing section (16); the second packing section (15) and the third packing section (16) are arranged in the second tower body (14); the third packing section (16) is arranged below the second packing section (15); the carbon dioxide capture device further comprises a first heat exchanger (40); the first heat exchanger (40) is connected between the bottom of the second packing section (15) and the top of the third packing section (16).

8. The carbon dioxide capture device according to claim 7, characterized in that The absorption tower (10) further comprises a fourth packing section (17), a second demister (18) and a nozzle arranged in the second tower body (14), wherein the second demister (18) is arranged above the fourth packing section (17), the second packing section (15) is arranged below the fourth packing section (17), and the nozzle is arranged between the fourth packing section (17) and the second demister (18).

9. The carbon dioxide capture device according to any one of claims 1 to 6, characterized in that: The carbon dioxide capture device further comprises a desorption tower (50) and a gas-liquid separator (60), the absorption tower (10) further comprises a first liquid outlet (19), the first liquid outlet (19) is communicated with the desorption tower (50), the gas-liquid separator (60) comprises a second liquid outlet (61), the second liquid outlet (61) is communicated with the first liquid inlet (13).

10. The carbon dioxide capture device according to claim 9, characterized in that The carbon dioxide capture device further comprises a second heat exchanger (70), wherein the second heat exchanger (70) is connected between the first liquid outlet (19) and the desorption tower (50).

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