An integrated system for capturing carbon dioxide from flue gas

Abstract

The application provides an integrated system for flue gas carbon dioxide capture, which comprises a flue gas purification assembly, a first cooling tower and a second cooling tower, wherein the flue gas purification assembly comprises a flue gas removal unit, an absorption unit, a regeneration unit and a storage unit; flue gas discharged from a power plant boiler passes through the flue gas removal unit and the absorption unit in sequence; 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 the first cooling tower; the flue gas removal unit comprises a desulfurization tower and a denitration tower which are connected with each other; the regeneration 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 the regeneration outlet of the regeneration tower. The integrated system for flue gas carbon dioxide capture has a small land occupation area and a high system integration degree.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide capture technology, and more specifically, to an integrated system for capturing carbon dioxide from flue gas. Background Technology

[0002] Carbon capture technology includes: flue gas pretreatment, CO2 capture, CO2 enrichment, CO2 desorption and concentration, absorbent regeneration and recycling, and CO2 transportation and storage. Related technologies require towers such as denitrification towers, desulfurization towers, scrubbing towers, absorption towers, regeneration towers, cooling towers, and related equipment connecting the towers for circulation. However, the numerous towers in these technologies result in a large system footprint. Materials between adjacent towers are transported via pipelines, but the long pipeline distances and significant losses of cooling capacity during transport can easily reduce the overall system efficiency. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose an integrated system for capturing carbon dioxide in flue gas, which has a small footprint and a high degree of system integration.

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

[0005] A flue gas purification assembly includes a flue gas removal unit, an absorption unit, a regeneration unit, and a storage unit. Flue gas discharged from a power plant boiler passes sequentially through the flue gas removal unit and the absorption unit to remove pollutants from the flue gas. The regeneration unit is connected to the absorption unit so that the absorbent reacting with the flue gas in the absorption unit is passed into the regeneration unit for regeneration. The regenerated absorbent is then passed back into the absorption unit. The storage unit is connected to the absorption unit to store a portion 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 inside the first cooling tower, and the flue gas removal unit includes a desulfurization tower and a denitrification tower connected together, with the denitrification tower located below the desulfurization tower.

[0007] The regeneration unit is arranged inside the second cooling tower. The regeneration unit includes a regeneration tower, a heating component, and a cooling component. The heating component is connected to the regeneration tower. The absorbent in the regeneration tower circulates between the heating component and the regeneration tower. The heating component is used to heat the absorbent. 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 flue gas carbon dioxide capture system of this invention arranges the flue gas removal unit and the regeneration unit in the first cooling tower and the second cooling tower, respectively. This not only reduces the floor space and shortens the conveying pipeline, but also reduces pipeline heat dissipation, 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 being annular and positioned below the first tower body, and the first cooling wall having a first cooling gap to allow outside air to pass through the first cooling gap.

[0010] The flue gas removal unit also includes a first cooling pipe, which is connected to the first cooling wall so that outside air can pass through the first cooling gap and cool the first cooling pipe.

[0011] In some embodiments, the internal space of the second cooling tower is divided into an installation area and a cooling area, the cooling area being annular and arranged around the installation area, and the regeneration unit being arranged within the installation area.

[0012] In some embodiments, in a plane orthogonal to the height direction of the second cooling tower, the ratio of the projected area of ​​the installation area to the 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 arranged at circumferential intervals along the regeneration tower.

[0014] In some embodiments, the regeneration unit further includes a connected MVR compressor and a flash tank, the flash tank being connected to the drain port of the regeneration tower and the MVR compressor being connected to the inlet port of the regeneration tower.

[0015] In some embodiments, a heat exchanger is further included, which is connected to both the absorption unit and the flash tank, so as to exchange heat between the rich absorbent discharged from the absorption unit and the lean absorbent discharged from the flash tank, and the rich absorbent after heat exchange is fed into the regeneration tower, and the lean absorbent after heat exchange is fed into the absorption unit.

[0016] In some embodiments, the cooling unit includes a water cooler and a separator connected together. 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, and the separator is connected to the water cooler.

[0017] In some embodiments, a demineralized water assembly is further included, the demineralized water assembly including a demineralized water tank and a demineralized water pump, the inlet of the demineralized water pump being connected to the demineralized water tank and the outlet of the demineralized water pump being connected to the absorption unit.

[0018] In some embodiments, an expansion tank is further included, which is connected to the packing layer of the second cooling tower. Attached Figure Description

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

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

[0021] Figure label:

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

[0023] 21. First cooling tower,

[0024] 22. Second cooling tower, 221. Installation area, 222. Cooling area. Detailed Implementation

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

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

[0027] The flue gas purification assembly includes a flue gas removal unit 11, an absorption unit 12, a regeneration unit, and a storage unit. Flue gas discharged from the power plant boiler sequentially passes through the flue gas removal unit 11 and the absorption unit 12 to remove pollutants. The regeneration unit is connected to the absorption unit 12 so that the absorbent reacting with the flue gas in the absorption unit 12 is passed into the regeneration unit for regeneration. The regenerated absorbent is then passed back into the absorption unit 12. The storage unit is connected to the absorption unit 12 to store a portion of the gas discharged from the absorption unit 12. The flue gas removal unit 11 is arranged inside the first cooling tower 21. The flue gas removal unit 11 includes a connected desulfurization tower and a denitrification tower, with the denitrification tower located below the desulfurization tower. The regeneration unit is arranged inside the second cooling tower 22. The regeneration unit 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. 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, such as Figure 1 and Figure 2 As shown, the flue gas purification assembly is used to remove particulate matter, sulfides, nitrogen oxides, etc., from the flue gas, enabling it to be directly discharged or stored. The desulfurization tower and denitrification tower are arranged sequentially, one above the other. The denitrification tower has a flue gas inlet and is connected to the boiler's exhaust outlet via a pipe, allowing the flue gas discharged from the exhaust outlet to enter the denitrification tower. The flue gas passes through the denitrification tower and desulfurization tower sequentially to remove sulfur dioxide and nitrogen oxides. The flue gas discharged from the desulfurization tower enters the absorption unit 12, where an absorbent is introduced, contacting the absorbent with the flue gas to further remove impurities. The regenerator can be an organic amine solution.

[0029] It is understandable that after the regenerant reacts with the flue gas in the regeneration unit, a saturated amine solution, i.e., regenerant rich liquid, will be produced. The regenerant rich liquid is then passed into the regeneration unit for regeneration, causing the amine solution to undergo a desorption reaction in the regeneration tower 131, thereby turning the regenerant rich liquid into regenerant lean liquid. The regenerant lean liquid is then passed into the absorption tower to react with the flue gas again.

[0030] The heating assembly 132 can be a reboiler, allowing the amine solution in the regeneration unit to exchange heat indirectly with the heat source in the heating assembly 132, thereby heating the amine solution and facilitating its desorption reaction. The cooling assembly 133 can be a water cooler 1331, wherein the circulation pipe of the water cooler 1331 is connected to the side wall of the second cooling tower 22, so that outside air cools the circulation pipe of the water cooler 1331 as it passes through the side wall of the second cooling tower 22.

[0031] It should be noted that both the first cooling tower 21 and the second cooling tower 22 are air-cooled towers, meaning that 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 cooling tower (i.e., the chimney effect), thereby achieving cooling of the equipment at the bottom of the first cooling tower 21 and the second cooling tower 22.

[0032] In other words, the integrated flue gas carbon dioxide capture system of the present invention arranges the flue gas removal unit 11 and the regeneration unit in the first cooling tower 21 and the second cooling tower 22, which not only reduces the floor space and shortens the conveying pipeline, but also reduces pipeline heat dissipation, 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 located below the first tower body. The first cooling wall has a first cooling gap to allow outside air to pass through the first cooling gap. The flue gas removal unit 11 also includes a first cooling pipe 111. The first cooling pipe 111 is connected to the first cooling wall so that outside air can pass through the first cooling gap and cool the first cooling pipe 111.

[0034] Specifically, such as Figure 1 and Figure 2 As shown, the first cooling wall includes a plurality of first cooling elements, which are arranged in a ring shape and spaced apart sequentially along the circumference of the first tower body. A first cooling gap is defined between two adjacent first cooling elements to allow outside air to pass through the first cooling gap.

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

[0036] It should be noted that the desulfurization tower and denitrification tower need to operate within a specific temperature range to ensure reaction efficiency and minimize operating energy consumption. The pump on the first cooling pipe 111 extracts the liquid after the reaction in the desulfurization tower and / or denitrification tower, uses outside air to cool the first cooling pipe 111, and then recirculates the cooled liquid into the desulfurization tower and / or denitrification tower to ensure the operating efficiency of the desulfurization tower or denitrification tower.

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

[0038] It is understandable that, such as Figure 1and Figure 2 As shown, the regeneration tower 131 is placed in the center of the installation area 221. Since the regeneration tower 131 has a certain height and width, it is necessary to maintain a certain distance between the regeneration tower 131 and the side wall of the second cooling tower 22 to avoid the regeneration tower 131 and the second cooling tower 22 being too close and blocking the air intake 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 projected area of ​​the installation area 221 to the projected 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 understood that the larger the projected 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, which more easily affects the ventilation resistance at the bottom of the second cooling tower 22, and thus more easily hinders the airflow within the second cooling tower 22.

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

[0041] In some embodiments, the regeneration unit further includes an MVR compressor 134 and a flash tank 135 connected together, the flash tank 135 being connected to the drain port of the regeneration tower 131, and the MVR compressor 134 being connected to the inlet port of the regeneration tower 131.

[0042] It is understandable that, such as Figure 1 and Figure 2 As shown, the liquid discharged from regeneration tower 131 contains saturated absorbent and unreacted acidic gases. The function of flash tank 135 is to separate the vapor and liquid phases from this liquid. In flash tank 135, the liquid comes into contact with a heat source (typically steam output from MVR compressor 134), causing some of the vapor to evaporate rapidly. The evaporated vapor leaves flash tank 135, while the unevaporated liquid remains in flash tank 135. This unevaporated liquid is typically transported to the bottom of flash tank 135 and may then be returned to regeneration tower 131 for further processing.

[0043] The steam discharged from flash tank 135 is the vapor portion of the liquid discharged from regeneration tower 131. MVR compressor 134 compresses this steam, increasing its pressure and temperature. Due to the increased enthalpy, the compressed steam can serve as a heat source for regeneration tower 131, heating the absorbent within it. In this way, MVR compressor 134 achieves the recycling of thermal energy, reducing external energy consumption. It should be noted that the steam discharged from the compressor may be directly returned to regeneration tower 131, or it may first pass through flash tank 135 and then be returned to regeneration tower 131, depending on the system design.

[0044] In some embodiments, the integrated system for capturing carbon dioxide in flue gas according to 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 rich absorbent discharged from the absorption unit 12 and the lean absorbent discharged from the flash tank 135 exchange heat, and the rich absorbent after heat exchange is fed into the regeneration tower 131, and the lean absorbent after heat exchange is fed into the absorption unit 12.

[0045] It is understandable that, such as Figure 1 and Figure 2 As shown, the liquid at the bottom of the flash tank 135 (i.e., the absorber lean liquid) is introduced into the heat exchanger 15 and indirectly exchanges heat with the absorbent rich liquid introduced into the heat exchanger 15 from the absorption unit 12. The heat-exchanged absorbent rich liquid is then introduced into the regeneration tower 131, while the heat-exchanged absorbent lean liquid is introduced into the regeneration unit. 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. Thus, after heat exchange in the heat exchanger 15, the temperature of the absorbent lean liquid decreases, facilitating its re-reaction with the flue gas in the absorption unit 12, achieving the reuse of the absorbent. Conversely, the temperature of the absorbent rich liquid increases, facilitating its regeneration in the regeneration tower 131.

[0046] In some embodiments, the cooling unit includes a water cooler 1331 and a separator 1332 connected together. The water cooler 1331 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. The separator 1332 is connected to the water cooler 1331.

[0047] Specifically, such as Figure 1 and Figure 2 As shown, the water cooler 1331 includes a second cooling pipe, and the second cooling tower 22 includes a second tower body and a second cooling wall. The second cooling wall is annular and located below the second tower body. The second cooling wall has a second cooling gap to allow outside air to pass through the second cooling gap.

[0048] It is understood that the second cooling wall includes multiple second cooling elements arranged in a ring and spaced apart sequentially along the circumference of the second tower body. A second cooling gap is defined between two adjacent second cooling elements to allow outside air to pass through. Second cooling pipes are connected to the second cooling wall, and pumps are installed on the second cooling pipes to circulate the cooling solution between the second cooling pipes 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 comes into contact with water through the water cooler 1331, where the heat is absorbed by the water, and the gas temperature drops. The cooled gas can be further used to heat the absorbent or in other processes, achieving heat energy recovery and recycling. The water cooler 1331 can also remove some water-soluble gases, such as sulfur trioxide, preventing them from corroding equipment and pipelines. The purpose of the separator 1332 is to separate the gas and liquid in the regeneration gas, ensuring 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., separating the gas and liquid droplets. The separated gas can be discharged from the top, while the separated liquid is collected from the bottom and can be sent back to the regeneration tower 131 or subjected to further processing. Furthermore, the separator 1332 is connected to a storage unit to allow the separated gas to be stored.

[0050] In some embodiments, such as Figure 1 As shown, the integrated system for capturing carbon dioxide in flue gas according to an embodiment of the present invention also includes a demineralized water component 16. The demineralized water component 16 includes a demineralized water tank and a demineralized water pump. The inlet of the demineralized water pump is connected to the demineralized water tank, and the outlet of the demineralized water pump is connected to the absorption unit.

[0051] Understandably, the absorption unit 12 also includes an absorption tower and a solution purification component connected to the absorption tower for treating the saturated absorbent discharged from the absorption tower, thereby restoring the absorbent's ability to capture carbon dioxide.

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

[0053] In other words, the expansion tank 17 is connected to the annular heat exchanger (i.e., the packing layer) of the second cooling tower 22, and the height of the expansion tank 17 is consistent with the height of the annular heat exchanger of the second cooling tower 22, so as to ensure stable water pressure in the annular heat exchanger.

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. An integrated system for flue gas carbon dioxide capture, characterized by, The application relates to a flue gas purification assembly, which comprises a flue gas removal unit, an absorption unit, a regeneration unit and a storage unit, flue gas discharged from a power plant boiler passes through the flue gas removal unit and the absorption unit in sequence so as to remove pollutants in the flue gas, the regeneration unit is connected with the absorption unit, the absorbent in the absorption unit after reacting with the flue gas is introduced into the regeneration unit for regeneration, the regenerated absorbent is introduced into the absorption unit again, the storage unit is connected with the absorption unit and is used for storing part of gas discharged from the absorption unit. The flue gas removal unit is arranged in a first cooling tower, the flue gas removal unit comprises a desulfurization tower and a denitration tower which are connected with each other, and the denitration tower is located below the desulfurization tower. The regeneration unit is arranged in a 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 and is used for cooling regenerated gas discharged from the regeneration outlet of the regeneration tower. The first cooling tower comprises a first tower body and a first cooling wall, the first cooling wall is annular and is arranged below the first tower body, the first cooling wall has a first cooling gap so that external air passes through the first cooling gap. The flue gas removal unit further comprises a first cooling pipeline which is connected with the first cooling wall. A pump on the first cooling pipeline pumps out liquid after the desulfurization tower and / or the denitration tower reacts, external air is used to cool and lower the temperature of the first cooling pipeline, and the liquid after being cooled is introduced into the desulfurization tower and / or the denitration tower again, so that external air passes through the first cooling gap and cools the first cooling pipeline. The tower space of the second cooling tower is divided into an installation area and a cooling area, the cooling area is annular, the cooling area is arranged around the installation area, and the regeneration unit is arranged in the installation area.

2. The integrated system for flue gas CO2 capture according to claim 1, characterized in that, In a plane perpendicular to the height direction of the second cooling tower, the ratio of the projection area of the installation area to the projection area of the second cooling tower is greater than or equal to 0.4 and less than or equal to 0.

6.

3. The integrated system for flue gas CO2 capture according to claim 2, characterized in that, The heating assembly comprises a plurality of reboilers which are arranged at intervals along the circumference of the regeneration tower.

4. The integrated system for flue gas CO2 capture according to claim 3, characterized in that, The regeneration unit further comprises an MVR compressor and a flash tank which are connected with each other, the flash tank is connected with a liquid discharge port of the regeneration tower, and the MVR compressor is connected with a liquid inlet port of the regeneration tower.

5. The integrated system for flue gas CO2 capture according to claim 4, characterized in that, The application further comprises a heat exchanger which is connected with 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 are heat-exchanged, the absorption rich liquid after being heat-exchanged is introduced into the regeneration tower, and the absorption lean liquid after being heat-exchanged is introduced into the absorption unit.

6. The integrated system for flue gas CO2 capture according to claim 5, characterized in that, ​ 7. The integrated system for flue gas CO2 capture according to claim 6, characterized in that, The cooling unit comprises a water cooler connected with the regeneration outlet of the regeneration tower for cooling the regenerated gas discharged from the regeneration outlet of the regeneration tower, and a separator connected with the water cooler.

8. The integrated system for flue gas CO2 capture according to claim 7, characterized in that, A desalted water assembly is further included, which comprises a desalted water tank and a desalted water pump, an inlet of the desalted water pump being connected with the desalted water tank, and an outlet of the desalted water pump being connected with the absorption unit.

9. The integrated system for flue gas CO2 capture according to claim 8, characterized in that, An expanded water tank is further included, which is connected with the filler layer of the second cooling tower.

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