Integrated system for capturing carbon dioxide in flue gas

Abstract

The invention provides a flue gas carbon dioxide capture integrated system, the flue gas carbon dioxide capture integrated system comprises a flue gas purification assembly, a first cooling tower and a second cooling tower, the flue gas purification assembly comprises a flue gas removal unit, an absorption unit, a regeneration unit and a storage unit, flue gas discharged by a power plant boiler sequentially passes through the flue gas removal unit and the absorption unit, the regeneration unit is connected with the absorption unit, the storage unit is connected with the absorption unit, the flue gas removal unit is arranged in a first cooling tower and comprises a desulfurization tower and a denitration tower which are connected, the regeneration unit is arranged in a second cooling tower, and the storage unit is arranged in the second cooling tower. The regeneration unit comprises a regeneration tower, a heating assembly and a cooling assembly, the heating assembly is connected with the regeneration tower, the absorbent in the regeneration tower circulates between the heating assembly and the regeneration tower, the heating assembly is used for heating the absorbent, and the cooling assembly is connected with a regeneration outlet of the regeneration tower. The integrated system for capturing the carbon dioxide in the flue gas is small in occupied area and high in system integration degree.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide capture, and in particular to an integrated system for capturing carbon dioxide from flue gas. Background Art

[0002] The carbon capture process includes: flue gas pretreatment, CO2 capture, CO2 enrichment, CO2 desorption and concentration, absorbent regeneration and circulation, and CO2 transportation and storage. In the related art, the towers required for the carbon capture process include: denitrification tower, desulfurization tower, scrubber, absorption tower, regeneration tower, cooling tower, and related equipment for connecting the tower circulation. However, the carbon capture process in the related art has many towers, resulting in a large footprint for the entire system. The materials between adjacent towers are transported through pipelines, but the pipelines are installed over a long distance, and the cooling capacity of the pipelines is greatly lost during the transportation process, which can easily lead to a reduction in the overall operating efficiency of the system. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least some extent. To this end, an embodiment of the present invention provides an integrated system for capturing flue gas carbon dioxide, which has a small footprint and a high degree of system integration.

[0004] The integrated system for capturing carbon dioxide from flue gas according to the embodiment of the present invention comprises:

[0005] A flue gas purification component, the flue gas purification component comprises a flue gas removal unit, an absorption unit, a regeneration unit and a sealing unit, the flue gas discharged from the power plant boiler passes through the flue gas removal unit and the absorption unit in sequence to remove pollutants in the flue gas, the regeneration unit is connected to the absorption unit, so that the absorbent in the absorption unit after reacting with the flue gas is passed into the regeneration unit for regeneration, and the regenerated absorbent is then passed into the absorption unit, and the sealing unit is connected to the absorption unit to seal part of the gas discharged from the absorption unit;

[0006] a first cooling tower and a second cooling tower, wherein the flue gas removal unit is arranged in the first cooling tower, the flue gas removal unit comprises a desulfurization tower and a denitration tower connected to each other, and the denitration tower is located below the desulfurization tower,

[0007] The regeneration unit is arranged in the second cooling tower, and the regeneration unit includes a regeneration tower, a heating component and a cooling component. The heating component is connected to the regeneration tower, and the absorbent in the regeneration tower circulates between the heating component and the regeneration tower. The heating component is used to heat the absorbent, and the cooling component is connected to the regeneration outlet of the regeneration tower to cool the regeneration gas discharged from the regeneration outlet of the regeneration tower.

[0008] The integrated system for capturing carbon dioxide from flue gas in the embodiment of the present invention arranges the flue gas removal unit and the regeneration unit in the first cooling tower and the second cooling tower, respectively, which not only reduces the floor space and shortens the transmission pipeline, but also reduces the heat dissipation of the pipeline, improves the overall thermal efficiency of the system, and reduces the workload of pipeline insulation and anti-corrosion measures.

[0009] In some embodiments, the first cooling tower includes a first tower body and a first cooling wall, the first cooling wall is annular and is disposed below the first tower body, and the first cooling wall has a first cooling gap to facilitate external air to pass through the first cooling gap.

[0010] The flue gas removal unit further includes a first cooling pipeline, which is connected to the first cooling wall so that external air passes through the first cooling gap and cools the first cooling pipeline.

[0011] In some embodiments, the space inside the second cooling tower is divided into an installation area and a cooling area. The cooling area is annular and is arranged around the installation area. The regeneration unit is arranged in the installation area.

[0012] In some embodiments, in a plane orthogonal to the height direction of the second cooling tower, a ratio of a projected area of ​​the installation area to a projected area of ​​the second cooling tower is greater than or equal to 0.4 and less than or equal to 0.6.

[0013] In some embodiments, the heating assembly includes a plurality of reboilers, and the plurality of reboilers are spaced apart along the circumference of the regeneration tower.

[0014] In some embodiments, the regeneration unit further comprises a connected MVR compressor and a flash tank, wherein the flash tank is connected to a liquid discharge port of the regeneration tower, and the MVR compressor is connected to a liquid inlet of the regeneration tower.

[0015] In some embodiments, a heat exchanger is also included, and the heat exchanger is connected to both the absorption unit and the flash tank to exchange heat between the absorption rich liquid discharged from the absorption unit and the absorption lean liquid discharged from the flash tank, and the absorption rich liquid after heat exchange is passed into the regeneration tower, and the absorption lean liquid after heat exchange is passed into the absorption unit.

[0016] In some embodiments, the cooling unit includes a connected water cooler and a separator, the water cooler is connected to the regeneration outlet of the regeneration tower for cooling the regeneration gas discharged from the regeneration outlet of the regeneration tower, and the separator is connected to the water cooler.

[0017] In some embodiments, a desalted water component is further included, and the desalted water component includes a desalted water tank and a desalted water pump. The inlet of the desalted water pump is connected to the desalted water tank, and the outlet of the desalted water pump is connected to the absorption unit.

[0018] In some embodiments, an expansion water tank is further included, wherein the expansion water tank is connected to the filler layer of the second cooling tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of an integrated system for capturing carbon dioxide from flue gas according to an embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the structure of an integrated system for capturing carbon dioxide from flue gas according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] 1. Flue gas purification component, 11. Flue gas removal unit, 111. First cooling pipeline, 12. Absorption unit, 13. Regeneration unit, 131. Regeneration tower, 132. Heating component, 133. Cooling component, 1331. Water cooler, 1332. Separator, 134. MVR compressor, 135. Flash tank, 15. Heat exchanger, 16. Desalination component, 17. Expansion water tank,

[0023] 21. The first cooling tower,

[0024] 22. Second cooling tower, 221. Installation area, 222. Cooling area. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0026] like Figure 1 and Figure 2 As shown, the integrated system for capturing carbon dioxide from flue gas according to the embodiment of the present invention comprises: a flue gas purification component 1 , a first cooling tower 21 and a second cooling tower 22 .

[0027] The flue gas purification assembly 1 includes a flue gas removal unit 11, an absorption unit 12, a regeneration unit 13 and a sealing unit. The flue gas discharged from the power plant boiler passes through the flue gas removal unit 11 and the absorption unit 12 in sequence to remove pollutants in the flue gas. The regeneration unit 13 is connected to the absorption unit 12 so that the absorbent in the absorption unit 12 that reacts with the flue gas is passed into the regeneration unit 13 for regeneration, and the regenerated absorbent is then passed into the absorption unit 12. The sealing unit is connected to the absorption unit 12 to seal part of the gas discharged from the absorption unit 12. The flue gas removal unit 11 is arranged in the first cooling tower 21. The flue gas removal unit 11 includes a connected desulfurization tower and a denitration tower, and the denitration tower is located below the desulfurization tower. The regeneration unit 13 is arranged in the second cooling tower 22, and the regeneration unit 13 includes a regeneration tower 131, a heating component 132 and a cooling component 133. The heating component 132 is connected to the regeneration tower 131, and the absorbent in the regeneration tower 131 circulates between the heating component 132 and the regeneration tower 131. The heating component 132 is used to heat the absorbent. The cooling component 133 is connected to the regeneration outlet of the regeneration tower 131 to cool the regeneration gas discharged from the regeneration outlet of the regeneration tower 131.

[0028] Specifically, Figure 1 and Figure 2 As shown, the flue gas purification component 1 is used to remove particulate matter, sulfide, nitrogen oxides, etc. in the flue gas so that the flue gas can be directly discharged or sealed. The desulfurization tower and the denitrification tower are arranged in sequence up and down. The denitrification tower has a flue gas inlet and is connected to the exhaust port of the boiler through a pipeline so that the flue gas discharged from the exhaust port can pass into the denitrification tower. The flue gas passes through the denitrification tower and the desulfurization tower in turn so that sulfur dioxide and nitrogen oxides in the flue gas can be removed. The flue gas discharged from the desulfurization tower is passed into the absorption unit 12, and an absorbent is passed into the absorption unit 12 so that the absorbent contacts the flue gas, and further removes the impurities in the corresponding flue gas. Among them, the regeneration agent can be an organic amine solution.

[0029] It can be understood that after the regeneration agent reacts with the flue gas in the regeneration unit 13, a saturated amine solution, i.e., a regeneration agent rich liquid, is produced. The regeneration agent rich liquid is introduced into the regeneration unit 13 for regeneration, so that the amine solution undergoes a desorption reaction in the regeneration tower 131, and the regeneration agent rich liquid is converted into a regeneration agent lean liquid. The regeneration agent lean liquid is introduced into the absorption tower to react with the flue gas again.

[0030] The heating component 132 may be a reboiler, and the amine solution in the regeneration unit 13 can be indirectly heat-exchanged with the heat source in the heating component 132, so that the amine solution is heated, which is beneficial to the desorption reaction of the amine solution. The cooling component 133 may be a water cooler 1331, wherein the circulation pipeline of the water cooler 1331 is connected to the side wall of the second cooling tower 22, so that the outside air passes through the side wall of the second cooling tower 22 to cool the circulation pipeline of the water cooler 1331.

[0031] It should be noted that the first cooling tower 21 and the second cooling tower 22 are both air-cooled towers, that is, outside air can enter the tower body from the bottom of the first cooling tower 21 and the second cooling tower 22, and be discharged from the top of the first cooling tower 21 and the second cold zone tower (i.e., the chimney effect), thereby achieving cooling of the bottom equipment of the first cooling tower 21 and the second cooling tower 22.

[0032] In other words, the integrated system for capturing carbon dioxide from flue gas according to the embodiment of the present invention arranges the flue gas removal unit 11 and the regeneration unit 13 in the first cooling tower 21 and the second cooling tower 22, respectively, which not only reduces the floor space and shortens the transportation pipeline, but also reduces the heat dissipation of the pipeline, improves the overall thermal efficiency of the system, and reduces the workload of pipeline insulation and anti-corrosion measures.

[0033] In some embodiments, the first cooling tower 21 includes a first tower body and a first cooling wall. The first cooling wall is annular and is placed below the first tower body. The first cooling wall has a first cooling gap to facilitate external air to pass through the first cooling gap. The flue gas removal unit 11 also includes a first cooling pipeline 111. The first cooling pipeline 111 is connected to the first cooling wall to facilitate external air to pass through the first cooling gap and cool the first cooling pipeline 111.

[0034] Specifically, Figure 1 and Figure 2 As shown, the first cooling wall includes a plurality of first cooling members, which are annular and arranged in sequence along the circumference of the first tower body. A first cooling gap is defined between two adjacent first cooling members so that outside air can pass through the first cooling gap.

[0035] It is understandable that the first cooling pipeline 111 is connected to at least one of the desulfurization tower or the denitrification tower, and a pump is provided on the first cooling pipeline 111 so that the cooling solution circulates between the desulfurization tower and / or the denitrification tower and the first cooling pipeline 111 .

[0036] It should be noted that the desulfurization tower and the denitration tower need to be operated within a specific temperature range during operation to ensure reaction efficiency and operating energy consumption. The pump on the first cooling pipeline 111 extracts the liquid after the reaction of the desulfurization tower and the denitration tower, uses the outside air to cool the first cooling pipeline 111, and then passes the cooled liquid into the desulfurization tower or the denitration tower to ensure the operating efficiency of the desulfurization tower or the denitration tower.

[0037] In some embodiments, the space inside the second cooling tower 22 is divided into an installation area 221 and a cooling area 222 . The cooling area 222 is annular and arranged around the installation area 221 . The regeneration unit 13 is arranged in the installation area 221 .

[0038] It is understandable that if Figure 1 and Figure 2 As shown, the regeneration tower 131 is placed at the center of the installation area 221. Since the regeneration tower 131 itself has a certain height and width, it is necessary to space the regeneration tower 131 from the side wall of the second cooling tower 22 by a certain distance to avoid the regeneration tower 131 and the second cooling tower 22 being too close to block the air inlet channel at the bottom of the second cooling tower 22.

[0039] Preferably, in a plane orthogonal to the height direction of the second cooling tower 22, the ratio of the projection area of ​​the installation area 221 to the projection area of ​​the second cooling tower 22 is greater than or equal to 0.4 and less than or equal to 0.6. It is understandable that the larger the projection area of ​​the installation area 221, the smaller the gap between the equipment installed in the installation area 221 and the second cooling tower 22, the easier it is to affect the size of the ventilation resistance at the bottom of the second cooling tower 22, and thus the easier it is to hinder the air flow in the second cooling tower 22.

[0040] Optionally, the heating assembly 132 includes a plurality of reboilers, and the plurality of reboilers are arranged at intervals along the circumference of the regeneration tower 131. Specifically, Figure 1 and Figure 2 As shown, the heating assembly 132 is arranged in the installation area 221, and there are two reboilers, which are respectively arranged on both sides of the regeneration unit 13. The reboilers are connected to the regeneration unit 13 through pipelines so that the liquid in the regeneration unit 13 can circulate between the reboilers and the regeneration unit 13.

[0041] In some embodiments, the regeneration unit 13 further includes a connected MVR compressor 134 and a flash tank 135 , the flash tank 135 is connected to the liquid discharge port of the regeneration tower 131 , and the MVR compressor 134 is connected to the liquid inlet of the regeneration tower 131 .

[0042] It is understandable that if Figure 1 and Figure 2 As shown, the liquid discharged from the regeneration tower 131 contains saturated absorbent and incompletely reacted acidic gas. The flash tank 135 is used to separate the vapor and liquid phases in these liquids. In the flash tank 135, the liquid contacts the heat source (usually the steam output from the MVR compressor 134), causing part of the vapor to evaporate rapidly. The evaporated vapor leaves the flash tank 135, while the unevaporated liquid remains in the flash tank 135. Usually, this part of the liquid will be transported to the bottom of the flash tank 135, and then may be sent back to the regeneration tower 131 for further processing.

[0043] The steam discharged from the flash tank 135 is the steam portion of the liquid discharged from the regeneration tower 131. The MVR compressor 134 compresses this portion of steam to increase its pressure and temperature. The compressed steam can be used as a heat source for the regeneration tower 131 because of the increase in thermal enthalpy, and is used to heat the absorbent in the regeneration tower 131. In this way, the MVR compressor 134 realizes the recycling of thermal energy and reduces the consumption of external energy. It should be noted that the steam discharged from the compressor may be directly sent back to the regeneration tower 131, or first pass through the flash tank 135 and then sent back to the regeneration tower 131, depending on the design of the system.

[0044] In some embodiments, the integrated system for capturing carbon dioxide from flue gas of an embodiment of the present invention further includes a heat exchanger 15, which is connected to both the absorption unit 12 and the flash tank 135, so that the absorption rich liquid discharged from the absorption unit 12 and the absorption lean liquid discharged from the flash tank 135 can be heat exchanged, and the absorption rich liquid after heat exchange is passed into the regeneration tower 131, and the absorption lean liquid after heat exchange is passed into the absorption unit 12.

[0045] It is understandable that if Figure 1 and Figure 2 As shown, the liquid at the bottom of the flash tank 135 (i.e., the absorber lean liquid) is passed into the heat exchanger 15, and indirectly heat-exchanged with the absorbent rich liquid passed into the heat exchanger 15 by the absorption unit 12, so that the absorbent rich liquid after heat exchange is passed into the regeneration tower 131, and the absorbent lean liquid after heat exchange is passed into the regeneration unit 13. Among them, the temperature of the absorbent lean liquid discharged from the flash tank 135 is higher than the temperature of the absorbent rich liquid discharged from the absorption unit 12. Therefore, after the absorbent lean liquid and the absorbent rich liquid are heat-exchanged in the heat exchanger 15, the temperature of the absorbent lean liquid is reduced so that it is easy to pass into the absorption unit 12 to react with the flue gas again, thereby realizing the reuse of the absorbent. The temperature of the absorbent rich liquid is increased so that the absorbent rich liquid is regenerated in the regeneration tower 131.

[0046] In some embodiments, the cooling unit includes a connected water cooler 1331 and a separator 1332 , the water cooler 1331 is connected to the regeneration outlet of the regeneration tower 131 for cooling the regeneration gas discharged from the regeneration outlet of the regeneration tower 131 , and the separator 1332 is connected to the water cooler 1331 .

[0047] Specifically, Figure 1 and Figure 2 As shown, the water cooler 1331 includes a second cooling pipeline, and the second cooling tower 22 includes a second tower body and a second cooling wall. The second cooling wall is annular and is placed below the second tower body. The second cooling wall has a second cooling gap to facilitate external air to pass through the second cooling gap.

[0048] It is understandable that the second cooling wall includes a plurality of second cooling members, which are annular and arranged in sequence along the circumference of the second tower body. A second cooling gap is defined between two adjacent second cooling members so that outside air can pass through the second cooling gap. The second cooling pipeline is connected to the second cooling wall, and a pump is provided on the second cold zone pipeline to circulate the cooling solution between the second cooling pipeline and the water cooler 1331.

[0049] It should be noted that the purpose of the water cooler 1331 is to reduce the temperature of the regeneration gas and recover heat. The hot gas discharged from the regeneration tower 131 contacts water through the water cooler 1331, the heat is absorbed by the water, and the gas temperature drops. The cooled gas can be further used to heat the absorbent or used in other processes to achieve heat recovery and recycling. The water cooler 1331 can also remove a portion of water-soluble gases, such as sulfur trioxide, to prevent it from corroding equipment and pipelines. The purpose of the separator 1332 is to separate the gas and liquid in the regeneration gas to ensure the cleanliness and dryness of the gas outlet. In the separator 1332, the gas passes through one or more separation units, such as a packed bed, a cyclone separator 1332, a filter, etc., to separate the gas and liquid droplets. The separated gas can be discharged from the top, and the separated liquid is collected from the bottom and can be sent back to the regeneration tower 131 or further processed. In addition, the separator 1332 is connected to the sealing unit so that the separated gas can be sealed.

[0050] In some embodiments, Figure 1 As shown, the integrated system for capturing carbon dioxide from flue gas in the embodiment of the present invention further includes a desalted water component 15, which includes a desalted water tank and a desalted water pump. The inlet of the desalted water pump is connected to the desalted water tank, and the outlet of the desalted water pump is connected to the absorption unit.

[0051] It is understandable that the absorption unit 12 further includes an absorption tower and a solution purification component, and the solution purification component is connected to the absorption tower to process the saturated absorbent discharged from the absorption tower so that the absorbent can restore its ability to capture carbon dioxide.

[0052] In some embodiments, Figure 1 As shown, the integrated system for capturing carbon dioxide from flue gas in the embodiment of the present invention further includes an expansion water tank 17 , and the expansion water tank 17 is connected to the packing layer of the second cooling tower 22 .

[0053] That is, the expansion water tank 17 is connected to the annular heat exchanger (ie, the packing layer) of the second cooling zone tower 22, and the height of the expansion water tank 17 is consistent with the height of the annular heat exchanger of the second cooling tower 22 to ensure stable water pressure in the annular heat exchanger.

[0054] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0058] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. An integrated system for capturing flue gas carbon dioxide, characterized in that: include: A flue gas purification component, the flue gas purification component comprises a flue gas removal unit, an absorption unit, a regeneration unit and a sealing unit, the flue gas discharged from the power plant boiler passes through the flue gas removal unit and the absorption unit in sequence to remove pollutants in the flue gas, the regeneration unit is connected to the absorption unit, so that the absorbent in the absorption unit after reacting with the flue gas is passed into the regeneration unit for regeneration, and the regenerated absorbent is then passed into the absorption unit, and the sealing unit is connected to the absorption unit to seal part of the gas discharged from the absorption unit; a first cooling tower and a second cooling tower, wherein the flue gas removal unit is arranged in the first cooling tower, the flue gas removal unit comprises a desulfurization tower and a denitration tower connected to each other, and the denitration tower is located below the desulfurization tower, The regeneration unit is arranged in the second cooling tower, and the regeneration unit includes a regeneration tower, a heating component and a cooling component. The heating component is connected to the regeneration tower, and the absorbent in the regeneration tower circulates between the heating component and the regeneration tower. The heating component is used to heat the absorbent, and the cooling component is connected to the regeneration outlet of the regeneration tower to cool the regeneration gas discharged from the regeneration outlet of the regeneration tower.

2. The integrated system for capturing flue gas carbon dioxide according to claim 1, characterized in that: The first cooling tower comprises a first tower body and a first cooling wall, wherein the first cooling wall is annular and is disposed below the first tower body, and the first cooling wall has a first cooling gap so that outside air can pass through the first cooling gap. The flue gas removal unit further includes a first cooling pipeline, which is connected to the first cooling wall so that external air passes through the first cooling gap and cools the first cooling pipeline.

3. The integrated system for capturing flue gas carbon dioxide according to claim 1, characterized in that: The inner space of the second cooling tower is divided into an installation area and a cooling area. The cooling area is annular and arranged around the installation area. The regeneration unit is arranged in the installation area.

4. The integrated system for capturing flue gas carbon dioxide according to claim 3, characterized in that: In a plane orthogonal to the height direction of the second cooling tower, a ratio of a projected area of ​​the installation area to a projected area of ​​the second cooling tower is greater than or equal to 0.4 and less than or equal to 0.

6.

5. The integrated system for capturing flue gas carbon dioxide according to claim 4, characterized in that: The heating assembly includes a plurality of reboilers, and the plurality of reboilers are arranged at intervals along the circumference of the regeneration tower.

6. The integrated system for capturing flue gas carbon dioxide according to claim 5, characterized in that: The regeneration unit further comprises a connected MVR compressor and a flash tank, wherein the flash tank is connected to a liquid discharge port of the regeneration tower, and the MVR compressor is connected to a liquid inlet of the regeneration tower.

7. The integrated system for capturing flue gas carbon dioxide according to claim 6, characterized in that: It also includes a heat exchanger, which is connected to the absorption unit and the flash tank, so that the absorption rich liquid discharged from the absorption unit and the absorption lean liquid discharged from the flash tank can be heat exchanged, and the absorption rich liquid after heat exchange is passed into the regeneration tower, and the absorption lean liquid after heat exchange is passed into the absorption unit.

8. The integrated system for capturing flue gas carbon dioxide according to claim 7, characterized in that: The cooling unit includes a water cooler and a separator connected to each other. The water cooler is connected to the regeneration outlet of the regeneration tower to cool the regeneration gas discharged from the regeneration outlet of the regeneration tower. The separator is connected to the water cooler.

9. The integrated system for capturing flue gas carbon dioxide according to claim 8, characterized in that: It also includes a desalted water component, which includes a desalted water tank and a desalted water pump. The inlet of the desalted water pump is connected to the desalted water tank, and the outlet of the desalted water pump is connected to the absorption unit.

10. The integrated system for capturing flue gas carbon dioxide according to claim 9, characterized in that: It also includes an expansion water tank, which is connected to the filler layer of the second cooling tower.

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