Water circulation system for carbon dioxide capture

Abstract

The invention provides a water circulation system for carbon dioxide capture, comprising: a combustion power generation device comprising a combustion structure, a power generation structure, a low-pressure heating structure and a flue gas heat recovery structure; the carbon dioxide trapping device is communicated with the combustion power generation device through a flue gas channel; the water supply device is communicated with the combustion power generation device and the carbon dioxide trapping device; the first heat exchange pipeline is communicated between the carbon dioxide trapping device and the flue gas heat recovery structure; and the second heat exchange pipeline is communicated between the carbon dioxide trapping device and the low-pressure heating structure. According to the technical scheme, the problem that in the related technology, the production cost is increased due to the fact that heating is conducted in the carbon dioxide trapping process through a heating device is effectively solved.

Description

Technical Field

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

[0002] The carbon dioxide capture device consists of a flue gas pretreatment system, a packed absorption tower, a packed regeneration tower, an exhaust gas scrubbing system, a solution boiler, an amine recovery heater, a product gas treatment system (including a condenser, a gas-liquid separator, a compressor) and a system water balance maintenance system.

[0003] The flue gas is sent to the absorption tower by the induced draft fan, where the carbon dioxide is absorbed by the amine solution, and the tail gas is discharged into the atmosphere from the top of the tower. The rich liquid after absorbing carbon dioxide is pumped from the bottom of the tower into the heat exchanger, and sent to the regeneration tower after recovering the heat. The desorbed carbon dioxide gas is sent to the fine treatment system after treatment. After compression, dehumidification, desulfurization, refrigeration and other processes, the final product is obtained.

[0004] In the related art, heat is required in the process of capturing carbon dioxide. A large amount of heat is generated during combustion to generate electricity, but this heat is not converted and used. Therefore, a separate heating device is required for heating in the process of capturing carbon dioxide, which will increase the production cost. Summary of the invention

[0005] The main purpose of the present invention is to provide a water circulation system for capturing carbon dioxide, so as to solve the problem in the related art that heating is performed during the carbon dioxide capture process by a heating device, thereby increasing production costs.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a water circulation system for carbon dioxide capture is provided, comprising: a combustion power generation device, comprising a combustion structure, a power generation structure, a low-pressure heating structure and a flue gas heat recovery structure; a carbon dioxide capture device, the carbon dioxide capture device being connected to the combustion power generation device through a flue gas channel; a water supply device, being connected to both the combustion power generation device and the carbon dioxide capture device; a first heat exchange pipeline, being connected between the carbon dioxide capture device and the flue gas heat recovery structure; and a second heat exchange pipeline, being connected between the carbon dioxide capture device and the low-pressure heating structure.

[0007] Furthermore, the water circulation system for carbon dioxide capture also includes a steam distributor and a first connecting pipe, the combustion power generation device also includes a pressurizing device, the pressurizing device is arranged between the power generation structure and the combustion structure, and the first connecting pipe is connected between the pressurizing device and the steam distributor.

[0008] Furthermore, the water circulation system for carbon dioxide capture also includes a first condensed water pipe, which is connected between the carbon dioxide capture device and the steam distributor.

[0009] Furthermore, the water circulation system for capturing carbon dioxide also includes an auxiliary steam generating structure and a second condensed water pipe, and the second condensed water pipe is connected between the steam distributor and the auxiliary steam generating structure.

[0010] Furthermore, the water circulation system for capturing carbon dioxide also includes a cooling water generating structure, and the cooling water generating structure is arranged on the water supply device.

[0011] Furthermore, the water supply device includes a water supply port, a drain port, a water supply pipe and a drain pipe, the water supply pipe is connected between the water supply port and the carbon dioxide capture device, and the drain pipe is connected between the drain port and the carbon dioxide capture device.

[0012] Furthermore, the water supply device also includes a second connecting pipe, the combustion power generation device also includes a steam condenser, both ends of the second connecting pipe are respectively connected between the water supply port and the drain port, and the steam condenser is arranged on the second connecting pipe.

[0013] Furthermore, the water circulation system for carbon dioxide capture also includes a first steam pipe and a second steam pipe, and the first steam pipe and the second steam pipe are both connected between the steam distributor and the carbon dioxide capture device.

[0014] Furthermore, the water circulation system for capturing carbon dioxide also includes a third steam pipe, which is arranged between the auxiliary steam generating structure and the steam distributor.

[0015] Furthermore, the combustion power generation device also includes a flue gas treatment structure and a flue gas heating structure, and the flue gas treatment structure is arranged between the flue gas heat recovery structure and the flue gas heating structure.

[0016] By applying the technical solution of the present invention, the combustion power generation device includes a combustion structure, a power generation structure, a low-pressure heating structure and a flue gas heat recovery structure. The carbon dioxide capture device is connected to the combustion power generation device through a flue gas channel. The water supply device is connected between the combustion power generation device and the carbon dioxide capture device. The first heat exchange pipeline is connected between the carbon dioxide capture device and the flue gas heat recovery structure, and the second heat exchange pipeline is connected between the carbon dioxide capture device and the low-pressure heating structure. Through the above-mentioned arrangement, the first heat exchange pipeline and the second heat exchange pipeline can absorb the heat generated by the combustion power generation device and transfer the heat to the carbon dioxide capture device for use, which can effectively reduce the waste of energy. Therefore, the technical solution of the present application effectively solves the problem of heating the carbon dioxide capture process by a heating device in the related art, thereby increasing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic flow diagram showing an embodiment of a water circulation system for capturing carbon dioxide according to the present invention;

[0019] Figure 2 Shows Figure 1 Schematic diagram of the specific structure of the water circulation system for carbon dioxide capture.

[0020] The above drawings include the following reference numerals:

[0021] 10. Combustion power generation device; 11. Combustion structure; 12. Power generation structure; 13. Low-pressure heating structure; 14. Flue gas heat recovery structure; 15. Pressurizing device; 16. Steam condenser; 17. Flue gas treatment structure; 18. Flue gas heating structure; 20. Carbon dioxide capture device; 30. Water supply device; 31. Water supply port; 32. Drain port; 33. Water supply pipe; 34. Drain pipe; 35. Second connecting pipe; 40. First heat exchange pipeline; 50. Second heat exchange pipeline; 61. Steam distributor; 62. First connecting pipe; 63. First condensate pipe; 64. Auxiliary steam generation structure; 65. Second condensate pipe; 66. Cooling water generation structure; 71. First steam pipe; 72. Second steam pipe; 73. Third steam pipe. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0025] like Figure 1 and Figure 2 As shown, in this embodiment, the water circulation system for carbon dioxide capture includes: a combustion power generation device 10, a carbon dioxide capture device 20, a water supply device 30, a first heat exchange pipeline 40 and a second heat exchange pipeline 50. The combustion power generation device 10 includes a combustion structure 11, a power generation structure 12, a low-pressure heating structure 13 and a flue gas heat recovery structure 14. The carbon dioxide capture device 20 is connected to the combustion power generation device 10 through a flue gas channel. The water supply device 30 is connected to both the combustion power generation device 10 and the carbon dioxide capture device 20. The first heat exchange pipeline 40 is connected between the carbon dioxide capture device 20 and the flue gas heat recovery structure 14. The second heat exchange pipeline 50 is connected between the carbon dioxide capture device 20 and the low-pressure heating structure 13.

[0026] Applying the technical solution of this embodiment, the combustion power generation device 10 includes a combustion structure 11, a power generation structure 12, a low-pressure heating structure 13 and a flue gas heat recovery structure 14. The carbon dioxide capture device 20 is connected to the combustion power generation device 10 through a flue gas channel. The water supply device 30 is connected between the combustion power generation device 10 and the carbon dioxide capture device 20. The first heat exchange pipeline 40 is connected between the carbon dioxide capture device 20 and the flue gas heat recovery structure 14, and the second heat exchange pipeline 50 is connected between the carbon dioxide capture device 20 and the low-pressure heating structure 13. Through the above-mentioned arrangement, the first heat exchange pipeline 40 and the second heat exchange pipeline 50 can absorb the heat generated by the combustion power generation device 10 and transfer the heat to the carbon dioxide capture device 20 for use, which can effectively reduce the waste of energy. Therefore, the technical solution of this embodiment effectively solves the problem of heating the carbon dioxide capture process by a heating device in the related art, thereby increasing the production cost.

[0027] The above-mentioned design can effectively utilize the waste heat in the combustion power generation process, reduce energy waste, and reduce the cost of carbon dioxide capture. It is suitable for scenarios such as large thermal power plants and industrial boilers, and helps to achieve energy conservation and emission reduction goals.

[0028] In practical applications, this system design can significantly improve energy efficiency and reduce energy consumption by at least 10%. At the same time, due to the effective recovery of waste heat in flue gas, the cost of carbon dioxide capture can be reduced by about 20%, and the implementation effect is obvious. In large thermal power plants and industrial boilers, this system can significantly reduce greenhouse gas emissions and support global carbon reduction goals, especially for facilities located in areas with strict carbon emission regulations.

[0029] like Figure 1 and Figure 2 As shown, in this embodiment, the water circulation system for carbon dioxide capture further includes a steam distributor 61 and a first connecting pipe 62, and the combustion power generation device 10 further includes a pressurizing device 15, which is arranged between the power generation structure 12 and the combustion structure 11, and the first connecting pipe 62 is connected between the pressurizing device 15 and the steam distributor 61. The above-mentioned steam distributor 61 can realize the distribution of steam. And by accurately controlling the distribution of steam, the thermal efficiency of the system can be further improved and the impact on the environment can be reduced. It is particularly suitable for use in occasions requiring high-precision thermal energy management, such as chemical plants and cogeneration systems.

[0030] Specifically, precise control of steam distribution can not only improve thermal efficiency, but also ensure stable operation of the system under various load conditions, avoiding the decline in efficiency and equipment damage caused by excessive or insufficient steam in traditional systems, thereby extending system life and reducing maintenance costs. For chemical plants and cogeneration systems, this ability to finely manage thermal energy makes it an ideal choice, able to meet the needs of continuous production while reducing emissions.

[0031] like Figure 1 and Figure 2 As shown, in this embodiment, the water circulation system for carbon dioxide capture further includes a first condensed water pipe 63, which is connected between the carbon dioxide capture device 20 and the steam distributor 61. The first condensed water pipe 63 has a simple structure, is easy to set up, and can effectively achieve heat exchange. In addition, this configuration enables the system to recycle the condensed water generated during the capture process and reuse it in the power generation or capture process, greatly reducing the consumption of water resources, which is particularly important for areas with scarce water resources.

[0032] Specifically, the recycling and reuse of condensed water not only saves water resources, but also avoids the extra energy consumption caused by water cooling, further improving the overall energy efficiency of the system. It can also effectively alleviate the shortage of water resources, reduce operating costs, and improve the overall resource utilization efficiency.

[0033] like Figure 1 and Figure 2 As shown, in this embodiment, the water circulation system for carbon dioxide capture also includes an auxiliary steam generating structure 64 and a second condensed water pipe 65, and the second condensed water pipe 65 is connected between the steam distributor 61 and the auxiliary steam generating structure 64. The auxiliary steam generating structure 64 can provide auxiliary steam, thereby ensuring the normal and stable operation of the entire system. In addition, the introduction of the auxiliary steam generating structure 64 can provide additional steam when the system load is low, ensuring the continuity and efficiency of carbon dioxide capture, and is suitable for industrial environments with intermittent load changes.

[0034] Specifically, the flexibility of the auxiliary steam generation structure 64 enables it to respond quickly when the load of the main system fluctuates, ensuring the continuity and efficiency of the carbon dioxide capture process. This feature is particularly important for industries with large intermittent production load changes such as steel and petrochemicals. By stabilizing the steam supply, the decline in carbon dioxide capture efficiency caused by load changes can be avoided, the environmental performance of the production process can be ensured, the impact on the environment can be reduced, and a win-win situation of economic and environmental benefits can be achieved.

[0035] like Figure 1 and Figure 2 As shown, in this embodiment, the water circulation system for carbon dioxide capture further includes a cooling water generating structure 66, which is disposed on the water supply device 30. The cooling water generating structure 66 can realize heat exchange of water. The efficient generation and recycling of cooling water helps to maintain the temperature stability of the system, prevent the equipment from overheating, and improve the overall operation safety and reliability, especially in the power generation and capture system operating in a high temperature environment.

[0036] Specifically, the recycling of cooling water is crucial to the stable operation of the system in a high-temperature environment. It can effectively avoid equipment failures caused by overheating and extend the life of the equipment.

[0037] like Figure 1 and Figure 2As shown, in this embodiment, the water supply device 30 includes a water supply port 31, a drain port 32, a water supply pipe 33 and a drain pipe 34. The water supply pipe 33 is connected between the water supply port 31 and the carbon dioxide capture device 20, and the drain pipe 34 is connected between the drain port 32 and the carbon dioxide capture device 20. The above-mentioned setting structure is simple and easy to set. The above-mentioned separation design of water supply and drainage can avoid pollution in the water cycle and ensure water quality. It is suitable for occasions with strict requirements on water quality, such as food processing and pharmaceutical manufacturing industries.

[0038] Specifically, the separation design of water supply and drainage effectively avoids possible pollution in the water cycle and ensures the purity of water quality, which is crucial for industries with strict requirements on water quality, such as food processing and pharmaceutical manufacturing. Pure water can not only meet the requirements of production technology, but also improve the quality and safety of products and reduce uncontrollable factors in the production process.

[0039] like Figure 1 and Figure 2 As shown, in this embodiment, the water supply device 30 further includes a second connecting pipe 35, the combustion power generation device 10 further includes a steam condenser 16, the two ends of the second connecting pipe 35 are respectively connected between the water supply port 31 and the drain port 32, and the steam condenser 16 is arranged on the second connecting pipe 35. The water circulation system for carbon dioxide capture also includes a first steam pipe 71 and a second steam pipe 72, and the first steam pipe 71 and the second steam pipe 72 are both connected between the steam distributor 61 and the carbon dioxide capture device 20. The water circulation system for carbon dioxide capture also includes a third steam pipe 73, and the third steam pipe 73 is arranged between the auxiliary steam generation structure 64 and the steam distributor 61. The combustion power generation device 10 also includes a flue gas treatment structure 17 and a flue gas heating structure 18, and the flue gas treatment structure 17 is arranged between the flue gas heat recovery structure 14 and the flue gas heating structure 18. In addition, the addition of the steam condenser 16 can recover the heat released during steam condensation for preheating water supply, further improving the utilization rate of energy and reducing the overall energy consumption of the system, which is suitable for application in modern power plants that pursue high energy efficiency. The double steam pipe design can provide a stable steam supply to ensure the continuity and efficiency of the CO2 capture process. It is suitable for large-scale industrial applications that require high stability, such as steel mills and cement plants.

[0040] In addition, the efficient heat recovery mechanism of the steam condenser 16 allows the system to fully utilize the heat released during the steam condensation process, which not only preheats the water supply, but also reduces the dependence on additional heating equipment, significantly improves energy utilization efficiency, and reduces overall energy consumption. Modern power plants adopt this design to meet the power supply needs while significantly reducing carbon footprint.

[0041] Specifically, the dual steam pipe design ensures the stability of the system in emergency situations through redundant steam supply paths, reducing production stoppages caused by single route failures. This design is crucial for industrial facilities such as steel mills and cement plants that have extremely high requirements for continuous production. It not only ensures the continuity of the carbon dioxide capture process, but also improves the capture efficiency, which is of great significance for reducing carbon emissions in industrial production and promoting the green transformation of the industry.

[0042] In this embodiment, the water circulation system for carbon dioxide capture further includes a third steam pipe 73, which is disposed between the auxiliary steam generating structure 64 and the steam distributor 61. The existence of the third steam pipe 73 enables the system to quickly start the auxiliary steam generating structure 64 when the main steam supply is insufficient, thereby ensuring the normal operation of the system.

[0043] The introduction of the third steam pipe 73 enhances the rapid response capability of the system. Even in an emergency situation where the main steam supply is interrupted, the auxiliary steam generating structure 64 can be quickly started to maintain the normal operation of the system. This design is particularly suitable for industrial scenarios that require high reliability and rapid recovery capabilities, such as aerospace, emergency rescue facilities, etc., ensuring the uninterrupted execution of critical tasks and improving overall safety and efficiency.

[0044] The combustion power generation device 10 also includes a flue gas treatment structure 17 and a flue gas heating structure 18. The flue gas treatment structure 17 is arranged between the flue gas heat recovery structure 14 and the flue gas heating structure 18. The flue gas treatment structure 17 can remove pollutants in the flue gas, and the flue gas heating structure can increase the flue gas temperature and optimize the subsequent carbon dioxide capture process. It is suitable for areas with strict environmental protection requirements, helps to reduce air pollution and protect the ecological environment.

[0045] The addition of flue gas treatment structure, through advanced purification technology, effectively removes harmful substances in flue gas, such as sulfur dioxide, nitrogen oxides, etc., reduces air pollution, protects the ecological environment, and complies with the increasingly stringent environmental protection regulations around the world. The setting of flue gas heating structure, by increasing the flue gas temperature, not only optimizes the capture efficiency of carbon dioxide, but also promotes the further treatment of other pollutants in the flue gas, achieving multiple environmental protection goals.

[0046] This solution not only improves the thermal efficiency of the combustion power generation device by optimizing the integrated design of the water circulation system and the carbon dioxide capture device, but also effectively reduces the energy consumption in the carbon dioxide capture process, achieving efficient energy utilization and environmentally friendly protection. In practical applications, this system can significantly improve the carbon emission reduction effect in the power production process, which is of great value in addressing global climate change.

[0047] This integrated water cycle and carbon dioxide capture system demonstrates its great potential in energy conservation and emission reduction through innovative thermal energy management and resource recovery strategies. Against the backdrop of global climate change and energy transformation, this system can not only significantly reduce carbon emissions from power generation facilities, but also adapt to a variety of different environments and needs through flexible configuration. For power companies and industrial facilities, the use of this system can significantly reduce operating costs and improve economic benefits, while establishing a good corporate image and laying a solid foundation for building a green, low-carbon future energy system.

[0048] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0049] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0050] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water circulation system for capturing carbon dioxide, characterized in that: include: A combustion power generation device (10) comprising a combustion structure (11), a power generation structure (12), a low-pressure heating structure (13) and a flue gas heat recovery structure (14); a carbon dioxide capture device (20), the carbon dioxide capture device (20) being in communication with the combustion power generation device (10) via a flue gas channel; a water supply device (30) connected to both the combustion power generation device (10) and the carbon dioxide capture device (20); A first heat exchange pipeline (40) connected between the carbon dioxide capture device (20) and the flue gas heat recovery structure (14); The second heat exchange pipeline (50) is connected between the carbon dioxide capture device (20) and the low-pressure heating structure (13).

2. The water circulation system for capturing carbon dioxide according to claim 1, characterized in that: The water circulation system for capturing carbon dioxide further comprises a steam distributor (61) and a first connecting pipe (62); the combustion power generation device (10) further comprises a pressurizing device (15); the pressurizing device (15) is arranged between the power generation structure (12) and the combustion structure (11); and the first connecting pipe (62) is connected between the pressurizing device (15) and the steam distributor (61).

3. The water circulation system for capturing carbon dioxide according to claim 2, characterized in that: The water circulation system for carbon dioxide capture further comprises a first condensed water pipe (63), wherein the first condensed water pipe (63) is connected between the carbon dioxide capture device (20) and the steam distributor (61).

4. The water circulation system for capturing carbon dioxide according to claim 2, characterized in that: The water circulation system for capturing carbon dioxide further comprises an auxiliary steam generating structure (64) and a second condensed water pipe (65), wherein the second condensed water pipe (65) is connected between the steam distributor (61) and the auxiliary steam generating structure (64).

5. The water circulation system for capturing carbon dioxide according to claim 1, characterized in that: The water circulation system for capturing carbon dioxide further comprises a cooling water generating structure (66), and the cooling water generating structure (66) is arranged on the water supply device (30).

6. The water circulation system for capturing carbon dioxide according to claim 1, characterized in that: The water supply device (30) comprises a water supply port (31), a water discharge port (32), a water supply pipe (33) and a water discharge pipe (34); the water supply pipe (33) is connected between the water supply port (31) and the carbon dioxide capture device (20); and the water discharge pipe (34) is connected between the water discharge port (32) and the carbon dioxide capture device (20).

7. The water circulation system for capturing carbon dioxide according to claim 6, characterized in that: The water supply device (30) further includes a second connecting pipe (35), and the combustion power generation device (10) further includes a steam condenser (16). The two ends of the second connecting pipe (35) are respectively connected between the water supply port (31) and the drain port (32), and the steam condenser (16) is arranged on the second connecting pipe (35).

8. The water circulation system for capturing carbon dioxide according to claim 2, characterized in that: The water circulation system for carbon dioxide capture further comprises a first steam pipe (71) and a second steam pipe (72), wherein the first steam pipe (71) and the second steam pipe (72) are both connected between the steam distributor (61) and the carbon dioxide capture device (20).

9. The water circulation system for capturing carbon dioxide according to claim 4, characterized in that: The water circulation system for capturing carbon dioxide further comprises a third steam pipe (73), wherein the third steam pipe (73) is arranged between the auxiliary steam generating structure (64) and the steam distributor (61).

10. The water circulation system for capturing carbon dioxide according to claim 1, characterized in that: The combustion power generation device (10) further comprises a flue gas treatment structure (17) and a flue gas heating structure (18), wherein the flue gas treatment structure (17) is arranged between the flue gas heat recovery structure (14) and the flue gas heating structure (18).

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