Carbon dioxide capture device

Abstract

The application provides a carbon dioxide capturing device, which comprises an absorption tower, an acid washing tower and an acid storage tank, wherein the absorption tower is provided with a first gas inlet, a first gas outlet and a first liquid inlet; the acid washing tower is provided with a second gas inlet, a second gas outlet and a second liquid inlet; the second gas inlet is communicated with the first gas outlet; and the acid storage tank is communicated with the second liquid inlet. The technical scheme of the application effectively solves the problem of high ammonia concentration in flue gas discharged when organic amine absorbent is used to remove carbon dioxide.

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 of reducing greenhouse gas emissions. Among these technologies, chemical absorption based on organic amines is a mature and widely used carbon dioxide capture technology. This method utilizes organic amines (such as monoethanolamine MEA and diethanolamine DEA) to absorb carbon dioxide from flue gas, thereby capturing and separating the carbon dioxide. Although the organic amine absorption method demonstrates high efficiency in carbon dioxide capture, it also presents some significant challenges during actual operation, particularly related to ammonia escape.

[0003] When high-temperature flue gas generated during coal-fired power generation passes through a carbon capture system, the carbon dioxide in the flue gas comes into contact with an organic amine absorbent and is absorbed. However, due to the high temperatures during the absorption process and the volatility of the organic amines, some of the organic amines degrade, producing ammonia. Ammonia is a highly volatile gas that dissolves rapidly in water. However, in a carbon capture system, due to factors such as airflow velocity, temperature fluctuations, and pressure fluctuations, some ammonia not absorbed by the liquid is emitted into the atmosphere along with the flue gas. This escaping ammonia poses a serious threat to the environment and human health. Ammonia is highly irritating and toxic. Long-term exposure to high concentrations of ammonia can cause damage to the respiratory system and eyes of power plant workers. Furthermore, once released into the atmosphere, ammonia easily reacts with air pollutants such as sulfur dioxide and nitrogen oxides to form fine particulate matter (PM2.5), exacerbating 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 exhaust 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, 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] Furthermore, 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, and the third packing section is arranged below the second packing section. 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 further includes a second heat exchanger, which 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 to enter the 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 removing the carbon dioxide in the flue gas. As the flue gas flows, it carries away ammonia produced by the degradation of the organic amine absorbent. It then flows into the pickling tower. After the ammonia reacts with water, it reacts with the acid flowing into the pickling tower, removing the carried-over ammonia and reducing the ammonia concentration in the flue gas. Therefore, the technical solution of this application effectively solves the problem of high ammonia concentration in the exhaust flue gas when using organic amine absorbents to remove carbon dioxide, a problem previously encountered in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying 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 Shown Figure 1 A schematic diagram of the three-dimensional structure of the first packing section of the carbon dioxide capture device;

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

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

[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. Three plate sections; 25131, first flow hole; 2514, fourth plate section; 252, second folding plate; 2521, fifth plate section; 25211, second flow hole; 2522, sixth plate section; 2523, seventh plate section; 2524, eighth plate section; 26, first demister; 30, acid storage tank; 40, first heat exchanger; 50, desorption tower; 60, gas-liquid separator; 61, second liquid outlet; 70, second heat exchanger; 80, filtering device; 90, precipitation device; 100, centrifugal device; 110, drying device. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying 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 embodiments described 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 in no way 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 making creative efforts 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, 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 actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods 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 the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an 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 spaced apart. The first liquid inlet 13 is located at the top of the absorption tower 10 and is used to admit absorbent. The pickling tower 20 has a second gas inlet 21, a second gas outlet 22, and a second liquid inlet 23, spaced apart. 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] The carbon dioxide capturing device comprises an absorption tower 10, an acid washing tower 20 and an acid storage tank 30. The absorption tower 10 is provided with a first gas inlet 11 and a first gas outlet 12. The absorption tower 10 is further provided with a first liquid inlet 13 arranged at the upper portion of the absorption tower 10, and the first liquid inlet 13 is used for the entry of the organic amine absorbent. The acid washing tower 20 is provided with 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 communicated with the first gas outlet 12. The acid storage tank 30 is communicated with the second liquid inlet 23. Through the above 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 acid washing tower 20 through the second gas inlet 21, and finally flow out of the acid washing 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, so as to remove the carbon dioxide in the flue gas. When the flue gas flows, the ammonia gas generated by the degradation of the organic amine absorbent is taken away and flows into the acid washing tower 20. After the ammonia gas reacts with water, the ammonia gas reacts with the acid flowing into the acid washing tower, so as to remove the taken-out ammonia gas and reduce the ammonia gas concentration in the flue gas. Therefore, the technical scheme of the embodiment effectively solves the problem of high ammonia gas concentration in the flue gas discharged when the organic amine absorbent is used to remove carbon dioxide in the related art.

[0028] It should be noted that the first liquid inlet 13 is arranged at the upper portion of the absorption tower 10, that is, the first liquid inlet 13 is arranged at a position above the central surface of the absorption tower 10.

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

[0030] The sulfuric acid is dilute sulfuric acid.

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

[0032] As shown in Figures 1 to 4 In the embodiment, the acid washing tower 20 comprises a first tower body 24 and a first packing section 25 arranged in the first tower body 24. By arranging the first packing section 25, the sulfuric acid can be more fully contacted with the ammonia gas, so as to ensure the removal effect of the ammonia gas.

[0033] The first packing section 25 comprises first and second folded plates 251 and 252 arranged at intervals, and the first folded plate 251 is located below the second folded 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, which are connected in sequence. The third plate segment 2513 is provided with a plurality of first flow holes 25131. The first and second plate segments form an obtuse angle. The second and third plate segments also form an obtuse angle. The third and fourth plate segments also form an obtuse angle. The third plate segment is taller than the first plate segment, and the third and first plate segments are both arranged horizontally.

[0035] The second folded plate 252 includes a fifth plate segment 2521, a sixth plate segment 2522, a seventh plate segment 2523, and an eighth plate segment 2524, which are connected in sequence. The fifth plate segment 2521 is provided with a plurality of second flow holes 25211. The fifth and sixth plate segments form an obtuse angle. The sixth and seventh plate segments also form an obtuse angle. The seventh and eighth plate segments also form an obtuse angle. The seventh plate segment is taller than the fifth plate segment, and both the seventh and fifth plate segments are arranged horizontally.

[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. The first plate segment 2511 is arranged parallel to 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] The aperture of the first flow hole 25131 gradually increases from the first folded plate 251 to the second folded plate 252, 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 gas is reversely contacted with sulfuric acid on the surface of the first packing section 25. After the ammonia gas enters the liquid phase and combines with water to form ammonium monohydrate, the ammonium monohydrate is neutralized by the sulfuric acid, which reduces the concentration of the ammonium monohydrate in the liquid phase, promotes the continuous combination of ammonia gas and water, reduces the concentration of dissolved ammonia gas in the liquid phase, increases the gas-liquid mass transfer driving force, and improves the removal efficiency. The sulfuric acid is recycled in the pickling tower and is supplemented by the acid storage tank when the concentration is too low.

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

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

[0043] As shown in the embodiment, 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, and the carbon dioxide capture device further comprises a first heat exchanger 40, which is communicated between the bottom of the second packing section 15 and the top of the third packing section 16. By arranging the second packing section 15 and the third packing section 16, the contact area of the flue gas and the organic amine absorbent can be increased, and the removal effect of the carbon dioxide can be ensured. By arranging the first heat exchanger 40, the temperature of the organic amine absorbent can be effectively reduced, so that the cooled organic amine absorbent can re-enter the second tower body 14 and remove the carbon dioxide, and the utilization rate of the organic amine absorbent is improved. Figure 1 The first heat exchanger 40 is a water-cooled heat exchanger.

[0044] The absorbent after absorbing the 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 removing the carbon dioxide carries part of the organic amine and the ammonia gas generated by the degradation thereof, which flows upward into the water washing section of the absorption tower 10 with the flue gas.

[0045] As shown in the embodiment, the pickling tower 20 further comprises a first demister 26 arranged in the first tower body 24, and the first demister 26 is arranged above the first packing section 25. The arrangement of the first demister 26 can effectively remove the liquid droplets in the flue gas, avoid the liquid from being brought into the subsequent equipment, and improve the stability and safety of the system.

[0046] Figure 1 ​​​As 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 the water. The second demister 18 can remove droplets in the flue gas to prevent liquid from being carried into subsequent equipment, thereby improving the stability and safety of the system. The nozzle can spray out the organic amine absorbent.

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

[0048] The flue gas containing organic amines and ammonia contacts water in countercurrent in the fourth packing section 17. Most of the organic amines and some of the ammonia are absorbed by the water. The absorbed solution and the solution collected by the second demister 18 are 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 and enters 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, which is connected to the desorption tower 50. The gas-liquid separator 60 has a second liquid outlet 61, which is connected to the first liquid inlet 13. The provision of the desorption tower 50 enables the separation of carbon dioxide from the organic amine absorbent. The provision of the gas-liquid separator 60 also enables the separation of carbon dioxide, thereby improving the purity of the discharged carbon dioxide.

[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 has absorbed and enriched carbon dioxide is called the rich liquid. After exchanging heat with the lean liquid in the second heat exchanger 70, it is pumped into the top of the desorption tower 50. There, it reacts with the hot steam flowing upwards on the surface of the fifth packing section of the desorption tower 50, desorbing the carbon dioxide. The desorbed high-purity carbon dioxide is separated in a gas-liquid separator and then collected and stored. The heat required for the desorption process is provided by the reboiler.

[0053] The CO2 capture device also includes an ammonium sulfate fertilizer production line, which primarily consists of a filter 80, a precipitator 90, a centrifuge 100, and a drying unit 110. This production line is fed with ammonium sulfate wastewater, produced after ammonia is absorbed by dilute sulfuric acid in the pickling tower 20. First, the undersaturated ammonium sulfate wastewater discharged from the pickling tower 20 is filtered to remove impurities. It then enters the precipitator 90 for concentration and precipitation, resulting in ammonium sulfate crystals, the primary component of the fertilizer. The ammonium sulfate crystals are then dehydrated in the centrifuge 100 and dried in the drying unit 110. Finally, the finished product is packaged and ready for sale and use.

[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 comparison, the carbon dioxide capture device of the present embodiment uses dilute sulfuric acid with a pH of 4 to 6 as an absorbent, and simultaneously adds a polymer (or ceramic) packing section with a height of 3 to 4 meters. The comprehensive use of chemical and physical means improves the gas-liquid mass transfer effect of the system and reduces the ammonia concentration in the exhaust gas. Dilute sulfuric acid is used to continuously neutralize and reduce the concentration of ammonia hydrates on the liquid surface, improves the gas-liquid mass transfer power, and accelerates the gas-liquid mass transfer process using 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 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 added to improve the economic efficiency of the pickling process.

[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 should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying 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 device or element 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 outline 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 herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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. Unless 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 foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A carbon dioxide capture device, characterized in that: include: An absorption tower (10) has 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), the acid storage tank (30) being in communication with the second liquid inlet (23); The pickling tower (20) comprises a first tower body (24) and a first filling section (25) arranged in the first tower body (24); the first filling section 25 comprises a first folding plate (251) and a second folding plate (252) arranged at intervals; the first folding plate (251) is located below the second folding plate (252); The first folding plate (251) comprises a first plate segment (2511), a second plate segment (2512), a third plate segment (2513) and a fourth plate segment (2514) connected in sequence, the third plate segment (2513) is provided with a plurality of first flow holes (25131), an obtuse angle is formed between the first plate segment (2511) and the second plate segment (2512), an obtuse angle is formed between the second plate segment (2512) and the third plate segment (2513), an obtuse angle is formed between the third plate segment (2513) and the fourth plate segment (2514), the third plate segment (2513) is higher than the first plate segment (2511), and the third plate segment (2513) and the first plate segment (2511) are both arranged in the horizontal direction; The second folding plate (252) comprises a fifth plate segment (2521), a sixth plate segment (2522), a seventh plate segment (2523) and an eighth plate segment (2524) connected in sequence, the fifth plate segment (2521) is provided with a plurality of second flow holes (25211), an obtuse angle is formed between the fifth plate segment (2521) and the sixth plate segment (2522), an obtuse angle is formed between the sixth plate segment (2522) and the seventh plate segment (2523), an obtuse angle is formed between the seventh plate segment (2523) and the eighth plate segment (2524), the seventh plate segment (2523) is higher than the fifth plate segment (2521), and the seventh plate segment (2523) and the fifth plate segment (2521) are both arranged in the horizontal direction; The included angle between the second plate segment (2512) and the first plate segment (2511) is smaller than the included angle between the fifth plate segment (2521) and the sixth plate segment (2522); the first plate segment (2511) and the fifth plate segment (2521) are arranged in parallel; the sixth plate segment (2522) and the eighth plate segment (2524) are arranged symmetrically with respect to the seventh plate segment (2523); and the second plate segment (2512) and the fourth plate segment (2514) are arranged symmetrically with respect to the third plate segment (2513); In the direction from the second folding plate (252) to the first folding plate (251), the aperture of the second flow hole (25211) gradually increases, and in the direction from the first folding plate (251) to the second folding plate (252), the aperture of the first flow hole (25131) gradually increases.

2. The carbon dioxide capture device according to claim 1, characterized in that Sulfuric acid is stored in the acid storage tank (30).

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) 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).

5. The carbon dioxide capture device according to claim 1, characterized in that The height of the first filling section (25) is between 3 meters and 4 meters.

6. The carbon dioxide capture device according to any one of claims 1 to 5, 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).

7. The carbon dioxide capture device according to claim 6, characterized in that The absorption tower (10) further includes a fourth packing section (17), a second demister (18) and a nozzle arranged in the second tower body (14), the second demister (18) being arranged above the fourth packing section (17), the second packing section (15) being arranged below the fourth packing section (17), and the nozzle being arranged between the fourth packing section (17) and the second demister (18).

8. The carbon dioxide capture device according to any one of claims 1 to 5, 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) being in communication with the desorption tower (50); the gas-liquid separator (60) comprises a second liquid outlet (61), the second liquid outlet (61) being in communication with the first liquid inlet (13).

9. The carbon dioxide capture device according to claim 8, 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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