Carbon capture power generation system

Abstract

A carbon capture power generation system. The carbon capture power generation system comprises a generator set (10), a carbon capture power generation device (20), and a heat exchange device (30); the heat exchange device (30) comprises a circulating heat exchange pipeline (31) and a heat exchanger (32) provided on the circulating heat exchange pipeline (31); a circulating heat exchange working medium flows through the circulating heat exchange pipeline (31); the heat exchanger (32) is provided with a first heat exchange pipe section and a second heat exchange pipe section which match for heat exchange; the heat exchanger (32) is communicated with a steam extraction opening (12) of a steam cylinder (11) of the generator set (10) by means of the first heat exchange pipe section; the heat exchanger (32) is communicated with the circulating heat exchange pipeline (31) by means of the second heat exchange pipe section; a reboiler (21) of the carbon capture power generation device (20) is provided with a third heat exchange pipe section capable of heating an absorbent; and the reboiler (21) is communicated with the circulating heat exchange pipeline (31) by means of the third heat exchange pipe section. The system can solve the problems in the related art of thermal degradation of an absorbent under heating and increased loss of the absorbent caused by reboiler temperature variations due to variable load operation of a generator set.

Description

Carbon capture power generation system Technical Field

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

[0002] Carbon capture power generation is one of the most critical low-carbon technologies currently available, contributing to the sustainable development of the power industry and possessing broad application prospects. The regeneration process of a carbon capture power generation system requires heating the absorbent to desorb carbon dioxide.

[0003] In the related art, steam extracted from the intermediate and low pressure cylinders of the power generation unit is directly introduced into the reboiler of the carbon capture power generation device to heat the absorbent.

[0004] However, when the generator set operates at variable load, the steam pressure will change, causing the steam condensation temperature to change, resulting in changes in the reboiler temperature. When the reboiler temperature is too high, it is easy to cause thermal degradation of the absorbent due to heat, exacerbating absorbent loss. Summary of the Invention

[0005] The present invention provides a carbon capture power generation system to solve the problem in the related art that the variable load operation of the generator set causes the reboiler temperature to change, which in turn easily causes the absorbent to be thermally degraded and aggravates the absorbent loss.

[0006] The present invention provides a carbon capture power generation system, which includes a generator set, a carbon capture power generation device and a heat exchange device. The heat exchange device includes a circulating heat exchange pipeline and a heat exchanger arranged on the circulating heat exchange pipeline. A circulating heat exchange medium flows in the circulating heat exchange pipeline. The heat exchanger has a first heat exchange pipe section and a second heat exchange pipe section for heat exchange. The heat exchanger is connected to the steam extraction port of the steam cylinder of the generator set through the first heat exchange pipe section, and the heat exchanger is connected to the circulating heat exchange pipeline through the second heat exchange pipe section. The reboiler of the carbon capture power generation device has a third heat exchange pipe section that can heat the absorbent, and the reboiler is connected to the circulating heat exchange pipeline through the third heat exchange pipe section.

[0007] Furthermore, both ends of the first heat exchange pipe section are respectively connected to the steam extraction port of the steam cylinder and the condenser of the generator set.

[0008] Furthermore, the steam cylinder includes a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder, and the heat exchanger is connected to the steam extraction port of the medium-pressure cylinder through a first heat exchange pipe section.

[0009] Furthermore, the heat exchange device also includes a compressor, and the first heat exchange pipe section is connected to the steam extraction port of the steam cylinder of the generator set through a connecting pipe; wherein the connecting pipe includes a main pipe, a first branch pipe and a second branch pipe, the first end of the main pipe is connected to the steam extraction port of the steam cylinder, the first end of the first branch pipe and the first end of the second branch pipe are respectively connected to the second end of the main pipe, the second end of the first branch pipe and the second end of the second branch pipe are respectively connected to the first heat exchange pipe section, the compressor is arranged on the first branch pipe, the first branch pipe is provided with two first connecting valves located on both sides of the compressor, and the second branch pipe is provided with a second connecting valve.

[0010] Furthermore, the heat exchange device also includes a pressure gauge, which is arranged on the main pipe.

[0011] Furthermore, the heat exchange device also includes a steam turbine, and the first heat exchange pipe section is connected to the steam extraction port of the steam cylinder of the generator set through a connecting pipe; wherein the connecting pipe includes a main pipe, a third branch pipe and a fourth branch pipe, the first end of the main pipe is connected to the steam extraction port of the steam cylinder, the first end of the third branch pipe and the first end of the fourth branch pipe are respectively connected to the second end of the main pipe, the second end of the third branch pipe and the second end of the fourth branch pipe are respectively connected to the first heat exchange pipe section, the steam turbine is arranged on the third branch pipe, the third branch pipe is provided with a third connecting valve located upstream of the steam turbine, and the fourth branch pipe is provided with a fourth connecting valve.

[0012] Furthermore, the heat exchange device includes two steam turbines, which are sequentially arranged on the third branch pipe, the connecting pipe also includes a fifth branch pipe, one end of the fifth branch pipe is connected to the fourth branch pipe, and the other end of the fifth branch pipe is connected to the portion of the third branch pipe located between the two steam turbines, a fourth connecting valve is arranged upstream of the fifth branch pipe, a fifth connecting valve is arranged on the fifth branch pipe, and a sixth connecting valve is also arranged on the fourth branch pipe and located downstream of the fifth branch pipe; and / or, the steam cylinder includes a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder, and the first end of the main pipe is connected to the steam extraction port of the high-pressure cylinder.

[0013] Furthermore, the steam cylinder includes a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder, and both ends of the first heat exchange pipe section are respectively connected to the steam extraction port of the high-pressure cylinder and the steam return port of the medium-pressure cylinder.

[0014] Furthermore, the heat exchange device also includes an auxiliary heat exchanger, which has a fourth heat exchange pipe section and a fifth heat exchange pipe section for heat exchange. The two ends of the fourth heat exchange pipe section are respectively connected to the steam extraction port of the medium pressure cylinder and the condenser of the generator set. The auxiliary heat exchanger is connected to the circulating heat exchange pipeline through the fifth heat exchange pipe section.

[0015] Furthermore, the heat exchange device further comprises a circulation pump provided on the circulating heat exchange pipeline; and / or the boiling point of the circulating heat exchange medium is between 120°C and 130°C.

[0016] Using the technical solution of the present invention, a carbon capture power generation system includes a generator set, a carbon capture power generation device, and a heat exchanger. First, in the heat exchanger, steam discharged from the steam extraction port of the generator set's steam cylinder is used to heat a circulating heat exchange medium, causing it to vaporize. Then, in the reboiler, the condensation process of the circulating heat exchange medium is utilized to heat the absorbent. Because the temperature of the circulating heat exchange medium during phase change is constant, the circulating heat exchange medium is kept at its evaporation temperature while heating the absorbent, preventing the absorbent from thermal degradation due to contact with excessively high steam temperatures and thus reducing absorbent loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0018] FIG1 shows a schematic diagram of a carbon capture power generation system according to a first embodiment of the present invention;

[0019] FIG2 shows a schematic diagram of a carbon capture power generation system according to a second embodiment of the present invention;

[0020] FIG3 shows a schematic diagram of a carbon capture power generation system according to a third embodiment of the present invention;

[0021] FIG4 shows a schematic diagram of a carbon capture power generation system according to a fourth embodiment of the present invention.

[0022] The above drawings include the following reference numerals:

[0023] 10. Generator set; 11. Steam cylinder; 111. High-pressure cylinder; 112. Medium-pressure cylinder; 113. Low-pressure cylinder; 12. Steam extraction port; 13. Condenser; 14. Steam return port; 15. Boiler; 16. Generator; 17. Steam extraction heater; 18. Deaerator; 19. Condensate pump;

[0024] 20. Carbon capture power generation device; 21. Reboiler; 22. Absorption tower; 23. Buffer tank; 24. Heat exchange element; 25. Separation tower; 26. Condenser; 27. Compressor;

[0025] 30. Heat exchange device; 31. Circulating heat exchange pipeline; 32. Heat exchanger; 33. Compressor; 34. Connecting pipe; 341. Main pipe; 342. First branch pipe; 3421. First connecting valve; 343. Second branch pipe; 3431. Second connecting valve; 344. Third branch pipe; 3441. Third connecting valve; 345. Fourth branch pipe; 3451. Fourth connecting valve; 3452. Sixth connecting valve; 346. Fifth branch pipe; 3461. Fifth connecting valve; 36. Steam turbine; 37. Auxiliary heat exchanger; 38. Circulating pump. Modes for Carrying Out the Invention

[0026] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] As shown in Figure 1, embodiment 1 of the present invention provides a carbon capture power generation system, which includes a generator set 10, a carbon capture power generation device 20 and a heat exchange device 30. The heat exchange device 30 includes a circulating heat exchange pipeline 31 and a heat exchanger 32 arranged on the circulating heat exchange pipeline 31. A circulating heat exchange medium flows in the circulating heat exchange pipeline 31. The heat exchanger 32 has a first heat exchange pipe section and a second heat exchange pipe section for heat exchange. The heat exchanger 32 is connected to the steam extraction port 12 of the steam cylinder 11 of the generator set 10 through the first heat exchange pipe section, and the heat exchanger 32 is connected to the circulating heat exchange pipeline 31 through the second heat exchange pipe section. The reboiler 21 of the carbon capture power generation device 20 has a third heat exchange pipe section that can heat the absorbent. The reboiler 21 is connected to the circulating heat exchange pipeline 31 through the third heat exchange pipe section.

[0028] The carbon capture power generation system provided in this embodiment first uses steam discharged from the steam extraction port of the generator set's steam cylinder to heat a circulating heat exchange medium in a heat exchanger, vaporizing it. The condensation process of the circulating heat exchange medium is then used in a reboiler to heat the absorbent. Because the circulating heat exchange medium maintains a constant temperature during phase transition, it maintains a constant evaporation temperature during the absorbent heating process, preventing thermal degradation of the absorbent from exposure to excessively high steam temperatures and minimizing absorbent loss.

[0029] Furthermore, the location and grade of steam extraction are no longer limited by the temperature resistance of the absorbent, allowing the carbon capture power generation system to operate normally under a wider range of peak-shaving conditions of the power generation units.

[0030] The carbon capture power generation system provided in this embodiment can also use the circulating heat exchange medium as a buffer to balance the drastic changes in steam parameters caused by rapid fluctuations in the generator set, cut off the impact of unit load changes on the carbon capture power generation system, and ensure the smooth operation of the carbon capture power generation system.

[0031] Furthermore, the circulating heat exchange fluid can serve as a heat storage medium. When the unit load is high, the working fluid vaporization rate in the heat exchanger is high, and the working fluid is not completely liquefied after passing through the reboiler. When the unit load is too low and the heat provided by the steam is insufficient to support the operation of the carbon capture power generation system, the heat stored in the working fluid can still be used to heat the absorbent using the existing gas phase working fluid.

[0032] It should be noted that in related technologies, under rated operating conditions, the steam pressure extracted from the intermediate and low-pressure cylinders is higher than the pressure required for absorbent regeneration. This typically requires the installation of a pressure reducing valve to reduce the steam pressure before it can enter the reboiler for heating, resulting in a significant loss of steam pressure. However, the carbon capture power generation system provided in this embodiment eliminates the need for a pressure reducing valve, thus avoiding any loss of steam pressure.

[0033] In this embodiment, the two ends of the first heat exchange pipe section are respectively connected to the steam extraction port 12 of the steam cylinder 11 and the condenser 13 of the generator set 10. After the steam completes the heat exchange with the second heat exchange pipe section in the first heat exchange pipe section, it can flow back to the condenser 13, avoiding waste and saving energy.

[0034] The steam cylinder 11 includes a high-pressure cylinder 111, an intermediate-pressure cylinder 112, and a low-pressure cylinder 113. The heat exchanger 32 is connected to the steam extraction port 12 of the intermediate-pressure cylinder 112 via a first heat exchange pipe section. The pressure of the steam discharged from the intermediate-pressure cylinder 112 is relatively suitable.

[0035] In this embodiment, the heat exchange device 30 further includes a circulation pump 38 provided on the circulating heat exchange pipeline 31 , which provides power for the circulating heat exchange medium in the circulating heat exchange pipeline 31 so that the circulating heat exchange medium circulates in the circulating heat exchange pipeline 31 .

[0036] The boiling point of the circulating heat exchange medium is between 120°C and 130°C. This allows the boiling point of the circulating heat exchange medium to be close to the reboiler temperature, transferring steam heat to the absorbent at a constant temperature and alleviating absorbent thermal degradation. Specifically, the boiling point of the circulating heat exchange medium can be 120°C, 125°C, 130°C, or any other value between 120°C and 130°C.

[0037] Specifically, the circulating heat exchange working fluid includes ethylene glycol monomethyl ether, octane, butyl acetate, morpholine, chlorobenzene, etc.

[0038] The generator set 10 further includes a boiler 15, a generator 16, an extraction steam heater 17, a deaerator 18, and a condensate pump 19. Since the generator set 10 is conventional, its detailed description is omitted here. The carbon capture power generation device 20 further includes an absorption tower 22, a buffer tank 23, a heat exchanger 24, a separation tower 25, a condenser 26, and a compressor 27. Since the carbon capture power generation device 20 is conventional, its detailed description is omitted here.

[0039] As shown in FIG2 , a second embodiment of the present invention provides a carbon capture power generation system. The difference between the second embodiment and the first embodiment is that in the second embodiment, a compressor is added after steam extraction.

[0040] Specifically, the heat exchange device 30 also includes a compressor 33. The first heat exchange pipe section is connected to the steam extraction port 12 of the steam cylinder 11 of the generator set 10 via a connecting pipe 34. The connecting pipe 34 includes a main pipe 341, a first branch pipe 342, and a second branch pipe 343. The first end of the main pipe 341 is connected to the steam extraction port 12 of the steam cylinder 11. The first end of the first branch pipe 342 and the first end of the second branch pipe 343 are respectively connected to the second end of the main pipe 341. The second end of the first branch pipe 342 and the second end of the second branch pipe 343 are respectively connected to the first heat exchange pipe section. The compressor 33 is disposed on the first branch pipe 342. The first branch pipe 342 is provided with two first connecting valves 3421 located on both sides of the compressor 33. The second branch pipe 343 is provided with a second connecting valve 3431.

[0041] In related technologies, when the unit operates at low load, turbine sliding pressure is severe, resulting in low extraction pressure from the intermediate pressure cylinder (IPC), which results in the pressure entering the reboiler failing to meet absorbent regeneration requirements. However, in the carbon capture power generation system provided in this embodiment, a compressor is added after steam extraction. When the unit (generator set) operates at low load, this increases the steam pressure and condensation temperature, ensuring that the steam in the heat exchanger effectively heats the circulating heat exchange medium, thereby expanding the variable load operating range of the carbon capture power generation system.

[0042] The heat exchange device 30 further includes a pressure gauge, which is provided on the main pipe 341 , so as to facilitate observation of the pressure in the main pipe 341 and determine when to allow the steam to flow through the compressor.

[0043] Specifically, when the pressure is lower than the pressure required for heat exchange (about 0.3 MPa.G), the opening and closing of the valve body is controlled to allow the steam to pass through the compressor to increase the steam pressure.

[0044] As shown in FIG3 , the third embodiment of the present invention provides a carbon capture power generation system. The difference between the third embodiment and the first embodiment is that in the third embodiment, a steam turbine is added after steam extraction to supplement power generation.

[0045] Specifically, the heat exchange device 30 also includes a steam turbine 36. The first heat exchange pipe section is connected to the steam extraction port 12 of the steam cylinder 11 of the generator set 10 via a connecting pipe 34. The connecting pipe 34 includes a main pipe 341, a third branch pipe 344, and a fourth branch pipe 345. The first end of the main pipe 341 is connected to the steam extraction port 12 of the steam cylinder 11. The first end of the third branch pipe 344 and the first end of the fourth branch pipe 345 are respectively connected to the second end of the main pipe 341. The second end of the third branch pipe 344 and the second end of the fourth branch pipe 345 are respectively connected to the first heat exchange pipe section. The steam turbine 36 is disposed on the third branch pipe 344. The third branch pipe 344 is provided with a third connecting valve 3441 located upstream of the steam turbine 36. The fourth branch pipe 345 is provided with a fourth connecting valve 3451.

[0046] With this structure, steam extraction is followed by a steam turbine for additional power generation. When the unit load is high, high-pressure steam flows through the turbine to generate electricity. This reduces steam pressure drop and power generation losses while also regulating the steam's condensation temperature, ensuring effective heating of the working fluid (circulating heat exchange medium) in the heat exchanger. When the unit load decreases, the extracted steam enters the heat exchanger directly. Compared to conventional steam extraction from the intermediate and low-pressure cylinders, this allows for higher steam extraction pressure at low unit loads, broadening the operating range of the carbon capture power generation system.

[0047] In this embodiment, the heat exchange device 30 includes two steam turbines 36, which are sequentially mounted on the third branch pipe 344. The connecting pipe 34 also includes a fifth branch pipe 346. One end of the fifth branch pipe 346 is connected to the fourth branch pipe 345, and the other end of the fifth branch pipe 346 is connected to the portion of the third branch pipe 344 located between the two steam turbines 36. A fourth connecting valve 3451 is located upstream of the fifth branch pipe 346. A fifth connecting valve 3461 is provided on the fifth branch pipe 346. A sixth connecting valve 3452 is also provided on the fourth branch pipe 345, located downstream of the fifth branch pipe 346. The steam cylinder 11 includes a high-pressure cylinder 111, an intermediate-pressure cylinder 112, and a low-pressure cylinder 113. The first end of the main pipe 341 is connected to the steam extraction port 12 of the high-pressure cylinder 111.

[0048] Specifically, steam extraction is followed by the addition of a steam turbine to supplement power generation. When the unit load is high, high-pressure steam passes through the turbine to generate electricity. This reduces steam pressure drop and power generation losses while also regulating the steam's condensation temperature, ensuring that the steam effectively heats the working fluid (circulating heat exchange medium) in the heat exchanger. When the unit load decreases, the steam pressure drops. At this point, valves are opened and closed to control the flow of steam through a steam turbine, increasing the pressure upon entry into the heat exchanger and the condensation temperature. When the unit load decreases further, the extracted steam enters the heat exchanger directly. Compared to conventional steam extraction from the intermediate and low-pressure cylinders, this allows for increased steam extraction pressure at low unit loads, broadening the operating range of the carbon capture system.

[0049] Specifically, when the unit operates at rated conditions, third connecting valve 3441 is opened, and fourth connecting valve 3451, fifth connecting valve 3461, and sixth connecting valve 3452 are closed. Steam flows through the two steam turbines to generate electricity, gradually reducing the steam pressure until the condensation temperature meets the requirements of the heat exchanger. After being heated in the heat exchanger, the working fluid returns to the appropriate location in the generator set (typically the condenser).

[0050] When the unit load decreases, the fourth connecting valve 3451 and the fifth connecting valve 3461 are opened, and the third connecting valve 3441 and the sixth connecting valve 3452 are closed. The steam generates electricity through one of the steam turbines, appropriately increasing the pressure of the steam entering the heat exchanger and the steam condensation temperature.

[0051] When the unit operates at low load, the fourth connecting valve 3451 and the sixth connecting valve 3452 are opened, and the third connecting valve 3441 and the fifth connecting valve 3461 are closed, and the steam directly enters the heat exchanger to maximize the steam pressure and condensation temperature.

[0052] As shown in FIG4 , a fourth embodiment of the present invention provides a carbon capture power generation system. The difference between the fourth embodiment and the first embodiment is that the fourth embodiment utilizes superheated high-pressure steam for heating.

[0053] In this embodiment, the steam cylinder 11 includes a high-pressure cylinder 111, an intermediate-pressure cylinder 112 and a low-pressure cylinder 113, and both ends of the first heat exchange pipe section are respectively connected to the steam extraction port 12 of the high-pressure cylinder 111 and the steam return port 14 of the intermediate-pressure cylinder 112.

[0054] Conventional carbon capture power generation systems typically utilize the latent heat of steam to heat the absorbent. The steam condenses into water in the reboiler and then enters the condenser directly, preventing further power generation and resulting in significant power generation losses. In this embodiment, steam is extracted from the high-pressure cylinder 111 and directly enters the heat exchanger, where its superheat heats the working fluid. The uncondensed steam then enters the intermediate-pressure cylinder 112, continuing power generation and reducing power generation losses. Furthermore, all steam from the high-pressure cylinder 111 is extracted for heat exchange before returning to the intermediate-pressure cylinder 112. This eliminates mixing of steam within the intermediate-pressure cylinder 112, maintaining consistent internal temperature and pressure parameters.

[0055] In this embodiment, the heat exchange device 30 further includes an auxiliary heat exchanger 37, which includes a fourth heat exchange segment and a fifth heat exchange segment for heat exchange coordination. The ends of the fourth heat exchange segment are connected to the steam extraction port 12 of the intermediate pressure cylinder 112 and the condenser 13 of the generator set 10, respectively. The auxiliary heat exchanger 37 is connected to the circulating heat exchange pipeline 31 via the fifth heat exchange segment. With this structure, the remaining heat demand is provided by the intermediate pressure cylinder 112 and returned to the condenser 13 after heating.

[0056] It should be noted that embodiments one to four can also be used in combination, which is not limited here, for example, a compressor and a steam turbine can be provided at the same time.

[0057] The carbon capture power generation system provided by the embodiment has the following beneficial effects:

[0058] (1) Add a closed working medium cycle between the steam and the absorbent, and use the extracted steam to heat the circulating heat exchange working medium, changing it from liquid to gas. Then use the circulating heat exchange working medium to heat the absorbent. Since the working medium is a closed cycle, the pressure does not change with the changes in the unit working conditions, so the boiling point is relatively fixed, and the temperature of the circulating heat exchange working medium during the condensation process can remain stable;

[0059] (2) Add a compressor after steam extraction to pressurize the steam under low load to ensure that the steam can continuously provide heat to the carbon capture power generation system. Under the peak load regulation of thermal power generation, the operating range of the carbon capture power generation system is expanded;

[0060] (3) Under rated operating conditions, high-pressure steam generates electricity through the steam turbine, which, while reducing the pressure, can compensate for the power generation losses caused by steam extraction. By adding a two-stage steam turbine, it is ensured that steam can continuously provide heat to the carbon capture power generation system under variable load conditions. Extracting steam from the high-pressure cylinder can expand the operating range of the carbon capture power generation system.

[0061] (4) The superheat of high-pressure steam is used to supply heat to the carbon capture power generation system. After the temperature reaches near saturation, it returns to the medium-pressure cylinder to reduce the power generation loss of the unit.

[0062] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0063] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0064] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0065] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0066] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0067] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A carbon capture power generation system, characterized in that: The carbon capture power generation system comprises a generator set (10), a carbon capture power generation device (20) and a heat exchange device (30). The heat exchange device (30) comprises a circulating heat exchange pipeline (31) and a heat exchanger (32) arranged on the circulating heat exchange pipeline (31). A circulating heat exchange medium flows in the circulating heat exchange pipeline (31). The heat exchanger (32) comprises a first heat exchange pipe section and a second heat exchange pipe section for heat exchange coordination. The heat exchanger (32) is connected to the steam extraction port (12) of the steam cylinder (11) of the generator set (10) through the first heat exchange pipe section. The heat exchanger (32) is connected to the circulating heat exchange pipeline (31) through the second heat exchange pipe section. The reboiler (21) of the carbon capture power generation device (20) has a third heat exchange pipe section capable of heating an absorbent. The reboiler (21) is connected to the circulating heat exchange pipeline (31) through the third heat exchange pipe section.

2. The carbon capture power generation system according to claim 1, characterized in that: Both ends of the first heat exchange pipe section are respectively connected to the steam extraction port (12) of the steam cylinder (11) and the condenser (13) of the generator set (10).

3. The carbon capture power generation system according to claim 1, characterized in that: The steam cylinder (11) comprises a high-pressure cylinder (111), a medium-pressure cylinder (112), and a low-pressure cylinder (113); the heat exchanger (32) is connected to the steam extraction port (12) of the medium-pressure cylinder (112) via the first heat exchange pipe section.

4. The carbon capture power generation system according to claim 1, characterized in that: The heat exchange device (30) further includes a compressor (33); the first heat exchange pipe section is connected to the steam extraction port (12) of the steam cylinder (11) of the generator set (10) via a connecting pipe (34); The connecting pipe (34) includes a main pipe (341), a first branch pipe (342), and a second branch pipe (343); the first end of the main pipe (341) is connected to the steam extraction port (12) of the steam cylinder (11); the first end of the first branch pipe (342) and the first end of the second branch pipe (343) are respectively connected to the second end of the main pipe (341); the second end of the first branch pipe (342) and the second end of the second branch pipe (343) are respectively connected to the first heat exchange pipe section; the compressor (33) is arranged on the first branch pipe (342); the first branch pipe (342) is provided with two first connecting valves (3421) located on both sides of the compressor (33); and the second branch pipe (343) is provided with a second connecting valve (3431).

5. The carbon capture power generation system according to claim 4, characterized in that: The heat exchange device (30) further includes a pressure gauge, which is arranged on the main pipe (341).

6. The carbon capture power generation system according to claim 1, characterized in that: The heat exchange device (30) further includes a steam turbine (36), and the first heat exchange pipe section is connected to the steam extraction port (12) of the steam cylinder (11) of the generator set (10) through a connecting pipe (34); The connecting pipe (34) includes a main pipe (341), a third branch pipe (344), and a fourth branch pipe (345); the first end of the main pipe (341) is connected to the steam extraction port (12) of the steam cylinder (11); the first end of the third branch pipe (344) and the first end of the fourth branch pipe (345) are respectively connected to the second end of the main pipe (341); the second end of the third branch pipe (344) and the second end of the fourth branch pipe (345) are respectively connected to the first heat exchange pipe section; the steam turbine (36) is arranged on the third branch pipe (344); the third connecting valve (3441) located upstream of the steam turbine (36) is arranged on the third branch pipe (344); and the fourth connecting valve (3451) is arranged on the fourth branch pipe (345).

7. The carbon capture power generation system according to claim 6, characterized in that: The heat exchange device (30) includes two steam turbines (36), the two steam turbines (36) are sequentially arranged on the third branch pipe (344), the connecting pipe (34) further includes a fifth branch pipe (346), one end of the fifth branch pipe (346) is connected to the fourth branch pipe (345), the other end of the fifth branch pipe (346) is connected to a portion of the third branch pipe (344) located between the two steam turbines (36), the fourth connecting valve (3451) is arranged upstream of the fifth branch pipe (346), the fifth branch pipe (346) is provided with a fifth connecting valve (3461), and the fourth branch pipe (345) is further provided with a sixth connecting valve (3452) located downstream of the fifth branch pipe (346); and / or, The steam cylinder (11) comprises a high-pressure cylinder (111), a medium-pressure cylinder (112), and a low-pressure cylinder (113); the first end of the main pipe (341) is connected to the steam extraction port (12) of the high-pressure cylinder (111).

8. The carbon capture power generation system according to claim 1, characterized in that: The steam cylinder (11) comprises a high-pressure cylinder (111), a medium-pressure cylinder (112), and a low-pressure cylinder (113); both ends of the first heat exchange pipe section are respectively connected to the steam extraction port (12) of the high-pressure cylinder (111) and the steam return port (14) of the medium-pressure cylinder (112).

9. The carbon capture power generation system according to claim 8, characterized in that: The heat exchange device (30) further includes an auxiliary heat exchanger (37), the auxiliary heat exchanger (37) having a fourth heat exchange pipe section and a fifth heat exchange pipe section for heat exchange coordination, the two ends of the fourth heat exchange pipe section being respectively connected to the steam extraction port (12) of the intermediate pressure cylinder (112) and the condenser (13) of the generator set (10), and the auxiliary heat exchanger (37) being connected to the circulating heat exchange pipeline (31) via the fifth heat exchange pipe section.

10. The carbon capture power generation system according to any one of claims 1 to 9, characterized in that: The heat exchange device (30) further includes a circulation pump (38) provided on the circulating heat exchange pipeline (31); and / or, The boiling point of the circulating heat exchange medium is between 120°C and 130°C.

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