Supercritical carbon dioxide power generation device

Abstract

The invention provides a supercritical carbon dioxide power generation device, which belongs to the field of power generation devices, and comprises a compressor unit, a combustion chamber, a turbine, an ejector, a regenerator, a first cooler, a booster pump, a first circulation loop, a first pipeline and a second circulation loop, one end of the first pipeline and the other end of the first circulation loop are both connected with an air outlet of the combustion chamber, the other end of the first pipeline is connected with the turbine, the ejector, the first cooler, the booster pump and the regenerator are sequentially connected to the first circulation loop in series, and one end of the second circulation loop is connected with an air outlet of the turbine. The other end of the second circulation loop is connected with the ejector, a regenerator is connected to the second circulation loop in series, and the compressor unit is used for providing oxygen and methane for the combustion chamber. The problem that in the prior art, energy consumption is large is solved. The technical effects of high energy utilization efficiency and low energy consumption are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of power generation devices, in particular to a supercritical carbon dioxide power generation device. Background Art

[0002] Zero-carbon power generation technology is crucial to the development of the future energy industry. The Allam cycle uses supercritical CO2 as a working fluid and drives the turbine to generate electricity through the combustion of gas fuel and oxygen. It is considered to be one of the most promising pure oxygen combustion power generation technologies. It has the characteristics of no nitrogen oxide emissions (the complete combustion products are water and carbon dioxide), complete carbon capture, and higher cycle efficiency (estimated to be between 51% and 64%). It is regarded as an important direction for future clean energy conversion. In the Allam cycle, the pressure of carbon dioxide at the turbine outlet is low. In order to achieve complete carbon capture, it is necessary to pressurize and recool the carbon dioxide after dehydration, which can reduce the space required for storage and the power consumption of the booster pump. However, the Allam cycle currently mainly uses a compressor to compress and boost the carbon dioxide after dehydration, which consumes a lot of energy, affects the energy efficiency of the system, increases the system cost and the complexity of control, and has low reliability for long-term operation. Summary of the invention

[0003] The present invention provides a supercritical carbon dioxide power generation device, which is used to solve the defects of the supercritical carbon dioxide power generation device in the prior art that the energy consumption is large and affects the energy efficiency of the system, and to reduce the energy consumption and energy conversion loss, thereby improving the energy utilization efficiency of the system.

[0004] The invention provides a supercritical carbon dioxide power generation device, comprising a compressor unit, a combustion chamber, a turbine, an ejector, a regenerator, a first cooler, a booster pump, a first circulation loop, a first pipeline and a second circulation loop, one end of the first circulation loop and the compressor unit are both connected to an air inlet of the combustion chamber, one end of the first pipeline and the other end of the first circulation loop are both connected to an air outlet of the combustion chamber, the other end of the first pipeline is connected to the turbine, the ejector, the first cooler, the booster pump and the regenerator are sequentially connected in series on the first circulation loop, one end of the second circulation loop is connected to the air outlet of the turbine, the other end of the second circulation loop is connected to the ejector, the second circulation loop is connected in series with the regenerator, and the compressor unit is used for providing oxygen and methane to the combustion chamber.

[0005] According to the supercritical carbon dioxide power generation device of the present invention, an ejector is used to directly recover expansion work for injection and pressure boosting, replacing the power consumption of the compressor for compression and pressure boosting, thereby reducing the energy consumption and energy conversion loss in the carbon dioxide pressure boosting process and improving the energy utilization efficiency of the system.

[0006] In addition, the expansion work of the high-temperature and high-pressure carbon dioxide at the outlet of the combustion chamber is directly recovered through the ejector, the low-temperature and low-pressure carbon dioxide is ejected, and the pressure of the low-temperature and low-pressure carbon dioxide is increased, thereby reducing the energy conversion loss in the process of converting mechanical energy into electrical energy and then into mechanical energy caused by the pressure increase of the carbon dioxide compressor, improving the overall energy efficiency, reducing the complexity of the system, and improving the reliability and long-term stable operation of the device.

[0007] In addition, the supercritical carbon dioxide power generation device according to the present invention may also have the following additional technical features: In some embodiments of the present invention, a second cooler is further included, wherein the second cooler is connected in series on the second circulation loop and is located between the regenerator and the ejector.

[0008] By adopting the above embodiment, the high-temperature gas passing through the turbine outlet of the turbine enters the regenerator for heat exchange, and the high-temperature carbon dioxide after the first heat exchange and cooling enters the second cooler for cooling, and then is sucked through the ejector to form the low-temperature low-pressure carbon dioxide cooled by the second cooler flowing out of the low-pressure side of the regenerator, and the working fluid and the ejection fluid are mixed and injected and pressurized in the ejector. The injected and increased carbon dioxide is cooled into a liquid state through the first cooler and water is separated. The mixed carbon dioxide gas can be recycled as a circulating working fluid, thereby realizing the recycling of carbon dioxide.

[0009] In some embodiments of the present invention, the first circulation loop includes a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline and a sixth pipeline, the second pipeline is installed between the combustion chamber and the injector, the third pipeline is installed between the injector and the first cooler, the fourth pipeline is installed between the first cooler and the boost pump, the fifth pipeline is installed between the regenerator and the boost pump, and the sixth pipeline is installed between the regenerator and the air intake of the combustion chamber.

[0010] By adopting the above-mentioned embodiment, the arrangement of the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline and the sixth pipeline realizes reliable connection between the combustion chamber and the injector, between the injector and the first cooler, between the first cooler and the boost pump, between the regenerator and the boost pump, and between the regenerator and the air intake of the combustion chamber.

[0011] In some embodiments of the present invention, the second circulation loop includes a seventh pipeline and an eighth pipeline, the seventh pipeline is installed between the gas outlet of the turbine and the regenerator, and the eighth pipeline is installed between the regenerator and the ejector.

[0012] In some embodiments of the present invention, the compressor unit includes an oxygen compressor and a methane compressor, and both the oxygen compressor and the methane compressor are connected to the air inlet of the combustion chamber through pipelines.

[0013] By adopting the above embodiment, the oxygen compressor and the methane compressor provide sufficient methane fuel and oxygen for the combustion chamber to ensure the reliability of the device. In some embodiments of the present invention, the ejector is provided with a working fluid inlet, an ejection fluid inlet and a mixed fluid outlet, the end of the second pipeline facing away from the combustion chamber is connected to the working fluid inlet, the end of the eighth pipeline facing away from the regenerator is connected to the ejection fluid inlet, and the end of the third pipeline facing away from the first cooler is connected to the mixed fluid outlet.

[0014] In some embodiments of the present invention, the ejector includes a nozzle, an intake chamber, a mixing chamber and a diffusion chamber, one end of the mixing chamber is connected to the intake chamber, the other end of the mixing chamber is connected to the diffusion chamber, the end of the intake chamber away from the mixing chamber is connected to the nozzle, a working fluid inlet is provided on the nozzle, an ejection fluid inlet is provided on one side of the intake chamber, and a mixed fluid outlet is provided at the end of the diffusion chamber away from the mixing chamber.

[0015] By adopting the above embodiment, since the ejector has a simple structure and no moving parts, the complexity of the device is reduced, and the reliability and long-term stable operation are improved.

[0016] In some embodiments of the present invention, a first liquid outlet is provided on the first cooler.

[0017] In some embodiments of the present invention, a second liquid outlet is provided on the second cooler.

[0018] By adopting the above embodiment, the provision of the first liquid outlet and the second liquid outlet enables rapid and reliable discharge of water.

[0019] In some embodiments of the present invention, a ninth pipeline and a carbon dioxide storage tank are further included. The carbon dioxide storage tank is connected to the first cooler through the ninth pipeline, and the ninth pipeline is connected in parallel with the first circulation pipeline.

[0020] By adopting the above embodiment, the carbon dioxide cooled by the first cooler will be diverted at the outlet of the first cooler. A part of the carbon dioxide is captured and enters the carbon dioxide storage tank, and the other part of the carbon dioxide is used as a circulating working fluid and is pressurized to a high pressure after flowing into the pump. The high-pressure and low-temperature carbon dioxide passes through the regenerator and exchanges heat with the low-pressure and high-temperature carbon dioxide flowing out of the turbine, thereby increasing the temperature of the carbon dioxide entering the combustion chamber, thereby forming a semi-closed cycle integrating combustion power generation and carbon capture, thereby making full use of the carbon dioxide.

[0021] In summary, this application includes the following beneficial technical effects: First, the expansion work of the high-temperature and high-pressure carbon dioxide at the outlet of the combustion chamber is directly recovered through the ejector, the low-temperature and low-pressure carbon dioxide is ejected, and the pressure of the low-temperature and low-pressure carbon dioxide is increased, thereby reducing the energy conversion loss in the process of converting mechanical energy into electrical energy and then into mechanical energy brought about by the pressure increase of the carbon dioxide compressor, improving the overall energy efficiency, reducing the complexity of the system, and improving the reliability and long-term stable operation of the device.

[0022] Second, the device uses an ejector with a simple structure, small size, easy processing, low cost, and easy size adjustment to adapt to systems with different power generation capacities. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 The structural diagram of the first structure of the supercritical carbon dioxide power generation device according to some embodiments of the present invention is schematically shown.

[0024] Figure 2 The schematic diagram of the structure of the ejector of the supercritical carbon dioxide power generation device according to some embodiments of the present invention is schematically shown.

[0025] Figure 3 The pressure-enthalpy diagram schematically shows the working principle of the supercritical carbon dioxide power generation device according to some embodiments of the present invention.

[0026] Figure 4 The structural diagram of the second structure of the supercritical carbon dioxide power generation device according to some embodiments of the present invention is schematically shown.

[0027] Reference numerals: 1. Oxygen compressor, 2. Methane compressor, 3. Combustion chamber, 4. Turbine, 5. Regenerator, 6. First cooler, 3. First liquid outlet, 7. Ejector, 701. Suction chamber, 702. Mixing chamber, 703. Diffuser chamber, 71. Working fluid inlet, 72. Ejector fluid inlet, 73. Mixed fluid outlet, 711. Nozzle, 8. Second cooler, 83. Second liquid outlet, 9. Booster pump, 10. Carbon dioxide storage tank, 11. Generator, 12. First pipeline, 13. Second pipeline, 14. Third pipeline, 15. Fourth pipeline, 16. Fifth pipeline, 17. Sixth pipeline, 18. Seventh pipeline, 19. Eighth pipeline, 20. Ninth pipeline. DETAILED DESCRIPTION

[0028] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0029] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0030] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0031] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is flipped, the element described as "below other elements or features" or "below other elements or features" will then be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be additionally oriented and rotated 90 degrees or in other directions and the spatial relative descriptors used in the text are interpreted accordingly.

[0032] like Figures 1 to 4 As shown, according to an embodiment of the first aspect of the present invention, a supercritical carbon dioxide power generation device is proposed, comprising a compressor unit, a combustion chamber 3, a turbine 4, an ejector 7, a regenerator 5, a first cooler 6, a boost pump 9, a first circulation loop, a first pipeline 12 and a second circulation loop, one end of the first circulation loop and the compressor unit are connected to the air inlet of the combustion chamber 3, one end of the first pipeline 12 and the other end of the first circulation loop are connected to the air outlet of the combustion chamber 3, the other end of the first pipeline 12 is connected to the turbine 4, the ejector 7, the first cooler 6, the boost pump 9 and the regenerator 5 are sequentially connected in series on the first circulation loop, one end of the second circulation loop is connected to the air outlet of the turbine 4, the other end of the second circulation loop is connected to the ejector 7, the second circulation loop is connected in series with the regenerator 5, and the compressor unit is used to provide oxygen and methane to the combustion chamber 3.

[0033] In the above embodiment, it should be noted that the combustion chamber 3, the turbine 4, the ejector 7, the regenerator 5, the first cooler 6 and the boost pump 9 are all existing combustion chambers 3, turbines 4, ejectors 7, regenerators 5, the first cooler 6 and the boost pump 9; the gas outlet of the combustion chamber 3 is connected to the first circulation loop and the first pipeline 12 through a tee; the turbine 4 is provided with a combustion product inlet, a turbine outlet and an electric power output, and the combustion product inlet is connected to the outlet of the combustion chamber through the first pipeline 12.

[0034] The device inputs methane and oxygen into the combustion chamber 3 through a compressor unit. The high-temperature and high-pressure gas generated by the combustion of methane and oxygen in the combustion chamber 3 is split at the outlet of the combustion chamber 3. A part of it flows into the first pipeline 12 and then flows into the turbine 4. The turbine expands the gas and works to drive the generator 11 to generate electricity. At this time, the temperature of the gas at the turbine outlet of the turbine 4 is still very high. The gas at the turbine outlet enters the regenerator 5 through the second circulation loop to be preheated and pressurized to be prepared to enter the combustion chamber 3 again as circulating carbon dioxide. Another part of the high-temperature and high-pressure gas flows into the ejector 7 through the first circulation loop as a working fluid. The gas is reduced in pressure by the ejector 7. The carbon dioxide flows into the booster pump 9 from the gas outlet of the first cooler 6, and after being pressurized by the booster pump 9, it flows into the regenerator 5 from the outlet of the booster pump 9, exchanges heat with the high-temperature carbon dioxide in the regenerator 5, and then enters the carbon dioxide intake port of the combustion chamber 3, thereby increasing the temperature of the carbon dioxide intake port of the combustion chamber 3, forming a semi-closed cycle integrating combustion power generation and carbon capture, reducing the energy consumption and energy conversion loss in the carbon dioxide pressurization process, and improving the energy utilization efficiency of the system.

[0035] The technical effects achieved by the above embodiments are as follows: First, the device uses the ejector 7 to directly recover the expansion work for injection and pressure boosting, replacing the compressor power consumption compression and pressure boosting, reducing the energy consumption and energy conversion loss in the carbon dioxide pressure boosting process, and improving the energy utilization efficiency of the system. Second, the ejector 7 directly recovers the expansion work of the high-temperature and high-pressure carbon dioxide at the outlet of the combustion chamber 3, injects low-temperature and low-pressure carbon dioxide, and increases the pressure of the low-temperature and low-pressure carbon dioxide, reducing the energy conversion loss in the process of converting mechanical energy into electrical energy and then into mechanical energy brought about by the carbon dioxide compressor pressure boosting, improving the overall energy efficiency, reducing the complexity of the system, and improving the reliability and long-term stable operation of the device.

[0036] Optional, such as Figure 1 As shown, a second cooler is also included. The second cooler 8 is connected in series on the second circulation loop and is located between the regenerator 5 and the ejector 7.

[0037] The beneficial effects of the above optional embodiments are as follows: the high-temperature gas passing through the turbine outlet of the turbine 4 enters the regenerator 5 for heat exchange, and the high-temperature carbon dioxide after the first heat exchange and cooling enters the second cooler 8 for cooling and cooling, and then is sucked through the ejector 7 to form the low-temperature and low-pressure carbon dioxide cooled by the second cooler 8 flowing out of the low-pressure side of the regenerator 5, and the working fluid and the ejection fluid are mixed and injected and pressurized in the ejector 7, and the injected and increased carbon dioxide is cooled into a liquid state through the first cooler 6 and water is separated, and the mixed carbon dioxide gas can be recycled as a circulating working fluid, thereby realizing the recycling of carbon dioxide.

[0038] Optional, such as Figure 1 and Figure 4 As shown, the first circulation loop includes a second pipeline 13, a third pipeline 14, a fourth pipeline 15, a fifth pipeline 16 and a sixth pipeline. The second pipeline 13 is installed between the combustion chamber 3 and the injector 7, the third pipeline 14 is installed between the injector 7 and the first cooler 6, the fourth pipeline 15 is installed between the first cooler 6 and the boost pump 9, the fifth pipeline 16 is installed between the regenerator 5 and the boost pump 9, and the sixth pipeline 17 is installed between the regenerator 5 and the air intake of the combustion chamber 3.

[0039] The beneficial effects of the above optional embodiments are as follows: through the arrangement of the second pipeline 13, the third pipeline 14, the fourth pipeline 15, the fifth pipeline 16 and the sixth pipeline 17, reliable connection is achieved between the combustion chamber 3 and the injector 7, between the injector 7 and the first cooler 6, between the first cooler 6 and the boost pump 9, between the regenerator 5 and the boost pump 9, and between the regenerator 5 and the air intake of the combustion chamber 3.

[0040] Optional, such as Figure 1 and Figure 4 As shown, the second circulation loop includes a seventh pipeline 18 and an eighth pipeline. The seventh pipeline 18 is installed between the air outlet of the turbine 4 and the regenerator 5 , and the eighth pipeline 19 is installed between the regenerator 5 and the ejector 7 .

[0041] In the above optional embodiment, it should be noted that the second cooler 8 is connected in series to the eighth pipeline 19 .

[0042] Optional, such as Figure 1 and Figure 4 As shown, the compressor unit includes an oxygen compressor 1 and a methane compressor 2, and both the oxygen compressor 1 and the methane compressor 2 are connected to the air inlet of the combustion chamber 3 through pipelines.

[0043] In the above optional embodiment, it should be noted that the oxygen compressor 1 is used to provide high-temperature and high-pressure oxygen to the combustion chamber 3, and the methane compressor 2 is used to provide high-temperature and high-pressure methane to the combustion chamber 3.

[0044] The beneficial effect of the above optional embodiment is that the oxygen compressor 1 and the methane compressor 2 provide sufficient methane fuel and oxygen for the operation of the combustion chamber 3 to ensure the reliability of the operation of the device.

[0045] Optional, such as Figure 2 As shown, the ejector 7 is provided with a working fluid inlet 71, an ejection fluid inlet 72 and a mixed fluid outlet, the end of the second pipeline 13 facing away from the combustion chamber 3 is connected to the working fluid inlet 71, the end of the eighth pipeline 19 facing away from the regenerator 5 is connected to the ejection fluid inlet 72, and the end of the third pipeline 14 facing away from the first cooler 6 is connected to the mixed fluid outlet 73.

[0046] Optional, such as Figure 2 As shown, the ejector 7 includes a nozzle 711, an intake chamber 701, a mixing chamber 702 and a diffusion chamber 703. One end of the mixing chamber 702 is connected to the intake chamber 701, and the other end of the mixing chamber 702 is connected to the diffusion chamber 703. The end of the intake chamber 701 away from the mixing chamber 702 is connected to the nozzle 7. A working fluid inlet is provided on the nozzle 711, an ejection fluid inlet is provided on one side of the intake chamber 701, and a mixed fluid outlet 73 is provided at the end of the diffusion chamber 703 away from the mixing chamber 702.

[0047] In the above optional embodiment, it should be noted that the nozzle 711, the suction chamber 701, the mixing chamber 702 and the diffusion chamber 703 are integrally formed, and the working principle of the ejector 7 is as follows: the working fluid enters the nozzle 711 through the working fluid inlet 71, and the pressure of the working fluid is reduced and the flow rate is increased after passing through the nozzle 711, and a low-pressure area is formed at the periphery of the outlet of the nozzle 711, that is, between the nozzle 711 and the suction chamber 701, thereby sucking in the low-temperature and low-pressure carbon dioxide cooled by the second cooler 8, and the ejection fluid enters the mixing chamber 702 through the ejection fluid inlet 72. After the working fluid and the ejection fluid are fully mixed in the mixing chamber 702, the mixed gas flow rate is reduced and the pressure is increased after passing through the diffusion chamber 703, and the temperature increases with the pressure, thereby realizing the pressurized mixing of the working fluid and the ejection fluid and entering the first cooler 6 so that the pressurized gaseous carbon dioxide is cooled into liquid and separated and stored in water.

[0048] The beneficial effects of the above optional embodiments are as follows: since the injector 7 has a simple structure and no moving parts, the complexity of the device is reduced, and the reliability and long-term stable operation of the device are improved.

[0049] Optional, such as Figure 1 and Figure 4 As shown, the first cooler 6 is provided with a first liquid outlet 63 , and the second cooler 8 is provided with a second liquid outlet 83 .

[0050] The beneficial effect of the above optional embodiment is that the provision of the first liquid outlet 63 and the second liquid outlet 83 enables rapid and reliable discharge of water.

[0051] Optional, such as Figure 1 and Figure 4 As shown, it also includes a ninth pipeline 20 and a carbon dioxide storage tank 1. The carbon dioxide storage tank 10 is connected to the first cooler 6 via the ninth pipeline 20, and the ninth pipeline 20 is connected in parallel with the first circulation pipeline.

[0052] In the above optional embodiment, it should be noted that the ninth pipeline 20 is connected in parallel with the first circulation pipeline through a tee. Specifically, the ninth pipeline 20 is connected in parallel with the fourth pipeline 15 through a tee.

[0053] The beneficial effects of the above optional embodiment are as follows: the carbon dioxide cooled by the first cooler 8 will be diverted at the outlet of the first cooler 8, a part of the carbon dioxide is captured and enters the carbon dioxide storage tank 10, and the other part of the carbon dioxide is used as a circulating working fluid, flows into the pump 9 and is pressurized to a high pressure, and the high-pressure and low-temperature carbon dioxide passes through the regenerator 5 and exchanges heat with the low-pressure and high-temperature carbon dioxide flowing out of the turbine 4, thereby increasing the temperature of the carbon dioxide entering the combustion chamber 3, thereby forming a semi-closed cycle integrating combustion power generation and carbon capture, thereby making full use of the carbon dioxide.

[0054] The working principle of this device is as follows Figure 3 As shown, the circulating working medium carbon dioxide will be divided at the combustion chamber outlet state point A, most of which enters the turbine 4 for expansion and power generation, that is, process A to B, B to C is the process of low-pressure circulating working medium carbon dioxide being cooled by heat exchange in the regenerator 5, and C to D is the process of low-pressure circulating working medium carbon dioxide being further cooled in the second cooler 8; another small part of the circulating working medium carbon dioxide at the combustion chamber 3 outlet enters the ejector 7 as a working fluid, Figure 3 The dotted line in the figure represents the working process of the circulating working fluid carbon dioxide inside the ejector 7. The high-temperature and high-pressure working fluid state point A sucks the low-temperature and low-pressure ejection fluid state point D into the ejector suction chamber 701. The ejection fluid and the working fluid are mixed in the mixing chamber 702 of the ejector, and then discharged after being pressurized in the diffusion chamber 703. The temperature of state point E is higher than that of state point D. It enters the first cooler 6 and is cooled again to state point F. The process from E to F not only cools the carbon dioxide, but also discharges the water therein. The obtained high-purity liquid carbon dioxide can be directly stored and used. A small part of the carbon dioxide used as the circulating working fluid is pressurized by the pump to state point G, and then preheated to state point H through the regenerator. At this time, the carbon dioxide is mixed with the pressurized oxygen and methane in the combustion chamber and burned to state point A.

[0055] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A supercritical carbon dioxide power generation device, characterized in that: The invention comprises a compressor unit, a combustion chamber (3), a turbine (4), an ejector (7), a regenerator (5), a first cooler (6), a boost pump (9), a first circulation loop, a first pipeline (12) and a second circulation loop, wherein one end of the first circulation loop and the compressor unit are connected to an air inlet of the combustion chamber (3), one end of the first pipeline (12) and the other end of the first circulation loop are connected to an air outlet of the combustion chamber (3), the other end of the first pipeline (12) is connected to the turbine (4), the ejector (7), the first cooler (6), the boost pump (9) and the regenerator (5) are sequentially connected in series to the first circulation loop, one end of the second circulation loop is connected to the air outlet of the turbine (4), the other end of the second circulation loop is connected to the ejector (7), the regenerator (5) is connected in series to the second circulation loop, and the compressor unit is used to supply oxygen and methane to the combustion chamber (3).

2. The supercritical carbon dioxide power generation device according to claim 1, characterized in that: The invention also comprises a second cooler (8), wherein the second cooler (8) is connected in series to the second circulation loop and is located between the regenerator (5) and the ejector (7).

3. The supercritical carbon dioxide power generation device according to claim 2, characterized in that: The first circulation loop comprises a second pipeline (13), a third pipeline (14), a fourth pipeline (15), a fifth pipeline (16) and a sixth pipeline (17), wherein the second pipeline (13) is installed between the combustion chamber (3) and the injector (7), the third pipeline (14) is installed between the injector (7) and the first cooler (6), the fourth pipeline (15) is installed between the first cooler (6) and the boost pump (9), the fifth pipeline (16) is installed between the regenerator (5) and the boost pump (9), and the sixth pipeline (17) is installed between the regenerator (5) and the air inlet of the combustion chamber (3).

4. The supercritical carbon dioxide power generation device according to claim 3, characterized in that: The second circulation loop comprises a seventh pipeline (18) and an eighth pipeline (19), wherein the seventh pipeline (18) is installed between the gas outlet of the turbine (4) and the regenerator (5), and the eighth pipeline (19) is installed between the regenerator (5) and the ejector (7).

5. The supercritical carbon dioxide power generation device according to any one of claims 1 to 4, characterized in that: The compressor unit comprises an oxygen compressor (1) and a methane compressor (2), wherein the oxygen compressor (1) and the methane compressor (2) are both connected to the air inlet of the combustion chamber (3) via a pipeline.

6. The supercritical carbon dioxide power generation device according to claim 5, characterized in that: The ejector (7) is provided with a working fluid inlet (71), an ejection fluid inlet (72) and a mixed fluid outlet (73); an end of the second pipeline (13) facing away from the combustion chamber (3) is connected to the working fluid inlet (71); an end of the eighth pipeline (19) facing away from the regenerator (5) is connected to the ejection fluid inlet (72); and an end of the third pipeline (14) facing away from the first cooler (6) is connected to the mixed fluid outlet (73).

7. The supercritical carbon dioxide power generation device according to claim 6, characterized in that: The ejector (7) comprises a nozzle (711), an intake chamber (701), a mixing chamber (702) and a diffusion chamber (703); one end of the mixing chamber (702) is connected to the intake chamber (701), the other end of the mixing chamber (702) is connected to the diffusion chamber (703); the end of the intake chamber (701) facing away from the mixing chamber (702) is connected to the nozzle (711); the nozzle (711) is provided with the working fluid inlet (71); one side of the intake chamber (701) is provided with the ejection fluid inlet (72); and the diffusion chamber (703) is provided with the mixed fluid outlet (73) at one end facing away from the mixing chamber (702).

8. The supercritical carbon dioxide power generation device according to claim 1, characterized in that: The first cooler (6) is provided with a first liquid outlet (63).

9. The supercritical carbon dioxide power generation device according to claim 2, characterized in that: The second cooler (8) is provided with a second liquid outlet (83).

10. The supercritical carbon dioxide power generation device according to any one of claims 1 to 4, characterized in that: It also comprises a ninth pipeline (20) and a carbon dioxide storage tank (10), wherein the carbon dioxide storage tank (10) is connected to the first cooler (6) via the ninth pipeline (20), and the ninth pipeline (20) is connected in parallel with the first circulation pipeline.

Images