Supercritical carbon dioxide Brayton cycle thermoelectric conversion system

Abstract

The embodiment of the invention relates to the field of devices for converting heat energy or kinetic energy into electric energy, in particular to a supercritical carbon dioxide Brayton cycle thermoelectric conversion system. Supercritical carbon dioxide flows out of the main heat exchanger of the reactor, exchanges heat with the system and flows back to the main heat exchanger. The system comprises a turbine used for receiving gas from a main heat exchanger and converting heat energy into kinetic energy, a generator used for receiving the kinetic energy from the turbine and converting the kinetic energy into electric energy, and a heat regenerator used for receiving gas from the turbine and gas from the turbine. The cooler is used for receiving the gas from the heat regenerator and cooling the gas; the compressor is used for receiving the gas from the cooler and compressing the gas; and the dry gas sealing device is used for providing high-pressure supercritical carbon dioxide for the turbine and the compressor and is arranged to take gas from the system and enable the gas to meet the preset temperature requirement. The system provided by the embodiment of the invention is beneficial to improving the output electric power and improving the thermoelectric conversion efficiency.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of devices for converting thermal energy or kinetic energy into electrical energy, and specifically to a supercritical carbon dioxide Brayton cycle thermoelectric conversion system. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] The supercritical carbon dioxide Brayton cycle thermoelectric conversion system is a power generation system that uses supercritical carbon dioxide as a working fluid to convert the heat of a heat source into mechanical energy and then into electrical energy. The supercritical carbon dioxide Brayton cycle thermoelectric conversion system usually includes a turbine, a generator and a compressor. The supercritical carbon dioxide obtained after compression by the compressor flows to the turbine, and the supercritical carbon dioxide is transported to the generator through the turbine to achieve power generation.

[0004] However, since turbines and compressors are both high-speed rotating mechanical equipment, dynamic seals are required when in use. The commonly used dynamic seals for turbines and compressors are dry gas seals (i.e., high-pressure supercritical carbon dioxide seals). When dry gas seals are used, there are problems such as high system power consumption and low output power. Summary of the invention

[0005] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0006] In view of the above problems, an embodiment of the present application provides a supercritical carbon dioxide Brayton cycle thermoelectric conversion system.

[0007] In a first aspect, an embodiment of the present application provides a supercritical carbon dioxide Brayton cycle thermoelectric conversion system, in which supercritical carbon dioxide flows out of a main heat exchanger of a reactor and flows back to the main heat exchanger after heat exchange in the system.

[0008] The supercritical carbon dioxide Brayton cycle thermoelectric conversion system includes a turbine, a compressor, a generator, a regenerator, a cooler, and a dry gas seal booster. The turbine is configured to receive supercritical carbon dioxide from the main heat exchanger and convert it from thermal energy to kinetic energy; the generator is configured to receive kinetic energy from the turbine and convert it into electrical energy; the regenerator is configured to receive supercritical carbon dioxide from the regenerator after the action of the turbine; the cooler is configured to receive supercritical carbon dioxide from the regenerator and cool it; the compressor is configured to receive cooled supercritical carbon dioxide from the cooler and compress it; and the regenerator is also configured to receive supercritical carbon dioxide from the compressor after compression and heat exchange with supercritical carbon dioxide from the turbine, and the supercritical carbon dioxide after heat exchange flows back to the main heat exchanger of the reactor; wherein the dry gas seal booster is configured to be fluidly connected with the turbine and the compressor and provide high-pressure supercritical carbon dioxide to the turbine and the compressor, and the dry gas seal booster is configured to take gas from the system and make the gas meet the predetermined temperature requirements.

[0009] The supercritical carbon dioxide Brayton cycle thermoelectric conversion system provided in the embodiment of the present application takes gas from the system through a dry gas sealing booster device, and makes the gas meet the predetermined temperature requirement, so that there is no need to heat the gas used for dry gas sealing, thereby avoiding an increase in the system's own electricity consumption, which is beneficial to increasing the system's output electrical power and improving the thermoelectric conversion efficiency.

[0010] In a second aspect, an embodiment of the present application provides a supercritical carbon dioxide Brayton cycle thermoelectric conversion system, in which supercritical carbon dioxide flows out of a main heat exchanger of a reactor and flows back to the main heat exchanger after heat exchange in the system.

[0011] The supercritical carbon dioxide Brayton cycle thermoelectric conversion system includes a Brayton cycle thermoelectric conversion component, a regenerator, a gas cooling and compression component, and a dry gas sealing and boosting device. The Brayton cycle thermoelectric conversion component is configured to utilize supercritical carbon dioxide received from the main heat exchanger and convert it from thermal energy into electrical energy; the regenerator is configured to receive supercritical carbon dioxide from the Brayton cycle thermoelectric conversion component; the gas cooling and compression component is configured to receive gas from the regenerator, cool it and compress it, and the regenerator is also configured to receive supercritical carbon dioxide from the gas cooling and compression component after compression, and make it heat exchange with supercritical carbon dioxide from the Brayton cycle thermoelectric conversion component after action, and the supercritical carbon dioxide after heat exchange flows back to the main heat exchanger of the reactor; the dry gas sealing and boosting device is configured to be able to fluidly communicate with the components that need gas sealing in the Brayton cycle thermoelectric conversion component, and provide high-pressure supercritical carbon dioxide to the components, and the dry gas sealing and boosting device is configured to take gas from the system and make the gas meet the predetermined temperature requirements.

[0012] The supercritical carbon dioxide Brayton cycle thermoelectric conversion system provided in the embodiment of the present application takes gas from the system through a dry gas sealing booster device, and makes the gas meet the predetermined temperature requirement, so that there is no need to heat the gas used for dry gas sealing, thereby avoiding an increase in the system's own electricity consumption, which is beneficial to increasing the output electrical power and improving the thermoelectric conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Other objects and advantages of the present application will become apparent from the following description of the embodiments of the present application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the present application.

[0014] Figure 1 It is a schematic structural diagram of the supercritical carbon dioxide Brayton cycle thermoelectric conversion system provided in an embodiment of the present application after being assembled with the main heater of the reactor.

[0015] Figure 2 yes Figure 1 The structure shown is a schematic diagram after omitting the first regulating valve and the second regulating valve.

[0016] Figure 3 It is a schematic structural diagram of the supercritical carbon dioxide Brayton cycle thermoelectric conversion system provided in an embodiment of the present application after omitting the regenerator and the cooler.

[0017] Description of reference numerals:

[0018] 100. Supercritical carbon dioxide Brayton cycle thermoelectric conversion system;

[0019] 11. turbine; 12. compressor; 13. generator; 14. regenerator; 15. cooler; 16. dry gas seal booster; 1601. first gas intake branch; 161. first regulating valve; 1602. second gas intake branch; 162. second regulating valve; 17. dry gas supplement device; 171. first circuit breaker valve; 172. second circuit breaker valve; 173. supplementary gas source;

[0020] 101. Brayton cycle thermoelectric conversion assembly; 102. Gas cooling compression assembly;

[0021] 210. Main heat exchanger.

[0022] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding. DETAILED DESCRIPTION

[0023] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0024] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0025] Since the temperature of the gas used for dry gas sealing is relatively low, in order to avoid damage to the equipment in the system due to uneven heating and cooling, electric heating devices are usually used to heat the gas used for dry gas sealing. However, heating by electric heating devices will increase the self-power consumption of the system, making the self-power consumption of the system extremely high, which in turn leads to low output power and thermoelectric conversion efficiency.

[0026] In view of the above problems, the embodiments of the present application provide a supercritical carbon dioxide Brayton cycle thermoelectric conversion system. Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of a supercritical carbon dioxide Brayton cycle thermoelectric conversion system provided in an embodiment of the present application and a main heater of a reactor after being assembled. Figure 2 yes Figure 1 The structure shown is a schematic diagram after omitting the first regulating valve and the second regulating valve. Supercritical carbon dioxide flows out of the main heat exchanger 210 of the reactor and flows back to the main heat exchanger 210 after heat exchange in the system.

[0027] The supercritical carbon dioxide Brayton cycle thermoelectric conversion system 100 includes a turbine 11 , a compressor 12 , a generator 13 , a regenerator 14 , a cooler 15 and a dry gas seal booster 16 . The turbine 11 is configured to receive supercritical carbon dioxide from the main heat exchanger 210 and convert it from thermal energy to kinetic energy; the generator 13 is configured to receive kinetic energy from the turbine 11 and convert it into electrical energy; the regenerator 14 is configured to receive supercritical carbon dioxide from the turbine 11 after being acted on; the cooler 15 is configured to receive supercritical carbon dioxide from the regenerator 14 and cool it; the compressor 12 is configured to receive the cooled supercritical carbon dioxide from the cooler 15 and compress it; and the regenerator 14 is further configured to receive supercritical carbon dioxide from the compressor 12 after being compressed, and to exchange heat with supercritical carbon dioxide from the turbine 11 after being acted on, and the supercritical carbon dioxide after the heat exchange flows back to the main heat exchanger 210 of the reactor; wherein the dry gas seal booster 16 is configured to be able to communicate with the turbine 11 and the compressor 12 fluids, and to provide high-pressure supercritical carbon dioxide to the turbine 11 and the compressor 12, and the dry gas seal booster 16 is configured to take gas from the system and make the gas meet the predetermined temperature requirements.

[0028] The supercritical carbon dioxide Brayton cycle thermoelectric conversion system 100 provided in the embodiment of the present application takes gas from the system through a dry gas sealing booster device 16, and makes the gas meet the predetermined temperature requirement, so that there is no need to heat the gas used for dry gas sealing, thereby avoiding an increase in the system's own electricity consumption, which is beneficial to increasing the output electrical power and improving the thermoelectric conversion efficiency.

[0029] In some embodiments, the supercritical carbon dioxide received by the turbine 11 may come from the main heat exchanger 210 of the lead-bismuth stack. In some embodiments, the gas obtained from the system by the dry gas seal booster 16 is supercritical carbon dioxide.

[0030] In some embodiments, the dry gas seal pressurizing device 16 may include a pressurizing component for pressurizing the gas obtained from the system. Since there is a pressure drop on the single side of the regenerator 14, the gas pressure of the gas after flowing through the regenerator 14 decreases, which in turn causes the gas pressure of the gas obtained from the system to decrease, and cannot meet the requirements of dry gas sealing. In such an embodiment, the gas obtained from the system is pressurized by the pressurizing component so that the gas pressure of the gas obtained from the system can meet the requirements of dry gas sealing.

[0031] See also Figure 1 and Figure 2In some embodiments, the dry gas seal booster 16 is provided with a first gas intake branch 1601 between the regenerator 14 and the compressor 12, and the dry gas seal booster 16 is provided with a second gas intake branch 1602 between the regenerator 14 and the main heat exchanger 210; the gas obtained by the first gas intake branch 1601 is mixed with the gas obtained by the second gas intake branch 1602 to obtain a gas that meets the predetermined temperature requirement. Since the temperature of the supercritical carbon dioxide between the regenerator 14 and the main heat exchanger 210 is relatively high, and the temperature of the supercritical carbon dioxide between the regenerator 14 and the compressor 12 is relatively low, in such an embodiment, the gas taken out of the first gas intake branch 1601 and the gas taken out of the second gas intake branch 1602 are mixed, so that the supercritical carbon dioxide with a higher temperature and the supercritical carbon dioxide with a lower temperature can exchange heat, which is conducive to adjusting the temperature of the taken out supercritical carbon dioxide to meet the predetermined temperature requirement.

[0032] In some embodiments, the first gas intake branch 1601 and the second gas intake branch 1602 are respectively configured to be able to adjust the flow of the first gas intake branch 1601 and the flow of the second gas intake branch 1602, so that the mixed gas meets the temperature requirements. In such an embodiment, by adjusting the flow of the first gas intake branch 1601 and the second gas intake branch 1602, the amount of supercritical carbon dioxide with a higher temperature and the amount of supercritical carbon dioxide with a lower temperature taken out can be adjusted, so that the gas after heat exchange can meet the predetermined temperature requirements.

[0033] See also Figure 1 In some embodiments, a first regulating valve 161 is provided in the first gas intake branch 1601, and a second regulating valve 162 is provided in the second gas intake branch 1602. The first regulating valve 161 and the second regulating valve 162 are configured to regulate the flow rate of the gas so that the gas obtained from the first gas intake branch 1601 is mixed with the gas obtained from the second gas intake branch 1602 to obtain a gas that meets the predetermined temperature requirement. In such an embodiment, the flow rates of the first gas intake branch 1601 and the second gas intake branch 1602 can be regulated by adjusting the first regulating valve 161 and the second regulating valve 162, thereby adjusting the amount of supercritical carbon dioxide taken out at different temperatures, so that the gas after heat exchange can meet the predetermined temperature requirement.

[0034] In some embodiments, the first regulating valve 161 and the second regulating valve 162 may be electric regulating valves.

[0035] In some embodiments, the flow rates of the first gas intake branch 1601 and the second gas intake branch are adjusted in the following manner:

[0036] T = (aT1 + bT2);

[0037] a=Q1 / (Q1+Q2);

[0038] b = Q2 / (Q1+Q2);

[0039] T is the temperature of the mixed gas, T1 is the temperature of the gas in the first gas branch 1601, T2 is the temperature of the gas in the second gas branch 1602, Q1 is the flow rate of the gas in the first gas branch 1601, and Q2 is the flow rate of the gas in the second gas branch 1602. In such an embodiment, the flow rate of the gas in the first gas branch 1601 and the flow rate of the gas in the second gas branch 1602 can be adjusted according to the above expression to achieve accurate adjustment of the temperature of the mixed gas.

[0040] In some embodiments, the temperature T1 of the gas in the first gas intake branch 1601 can be measured by a temperature measuring point at the rear end of the compressor 12, and the temperature T2 of the gas in the second gas intake branch 1602 can be measured by a temperature measuring point at the rear end of the regenerator 14.

[0041] In some embodiments, the supercritical carbon dioxide Brayton cycle thermoelectric conversion system 100 may further include a supplementary dry gas device 17, which is configured to provide high-pressure supercritical carbon dioxide to the turbine 11 and the compressor 12 when the dry gas seal booster device 16 fails. In such an embodiment, by providing the supplementary dry gas device 17, it is possible to prevent the dry gas seal of the turbine 11 and the compressor 12 from completely failing due to the failure of the dry gas seal device, which is beneficial to ensuring the sealing of the system, and further beneficial to ensuring the operation of the system and the safety of the system.

[0042] See also Figure 1 and Figure 3 , Figure 3 1 is a schematic diagram of the structure of the supercritical carbon dioxide Brayton cycle thermoelectric conversion system 100 provided in an embodiment of the present application after omitting the regenerator 14 and the cooler 15. In some embodiments, the supplementary dry gas device 17 may include a supplementary gas source 173, a first circuit breaker valve 171, and a second circuit breaker valve 172. The supplementary gas source 173 is configured to be fluidly connected to the turbine 11 and the compressor 12; the first circuit breaker valve 171 is configured to control the supplementary gas source 173 to be fluidly connected or disconnected from the turbine 11 and the compressor 12; the second circuit breaker valve 172 is configured to control the dry gas seal boosting device 16 to be fluidly connected or disconnected from the turbine 11 and the compressor 12. When the first circuit-breaking valve 171 is configured to connect the supplementary air source 173 to the fluid of the turbine 11 and the compressor 12, the second circuit-breaking valve 172 is configured to disconnect the dry gas sealing boosting device 16 from the fluid of the turbine 11 and the compressor 12; when the first circuit-breaking valve 171 is configured to disconnect the supplementary air source 173 from the fluid of the turbine 11 and the compressor 12, the second circuit-breaking valve 172 is configured to connect the dry gas sealing boosting device 16 to the fluid of the turbine 11 and the compressor 12.

[0043] In such an embodiment, the above-mentioned arrangement enables the supplementary gas source 173 to be fluidly connected to the turbine 11 and the compressor 12 when the dry gas seal booster device 16 fails, thereby enabling the supplementary gas source 173 to provide gas to the turbine 11 and the compressor 12 to ensure dry gas sealing.

[0044] In some embodiments, the supplementary gas source 173 includes a gas providing component, a conveying component and a heating component. The gas providing component is used to provide the supercritical carbon dioxide required for dry gas sealing to the turbine 11 and the compressor 12; the heating component is used to heat the supercritical carbon dioxide provided to the turbine 11 and the compressor 12 so that the provided supercritical carbon dioxide meets the predetermined temperature requirements; the conveying component is used to convey the supercritical carbon dioxide that meets the predetermined temperature requirements to the turbine 11 and the compressor 12.

[0045] In some embodiments, the conveying element may be a pump, and the heating element may be an electric heating device.

[0046] The embodiment of the present application also provides a supercritical carbon dioxide Brayton cycle thermoelectric conversion system 100, in which supercritical carbon dioxide flows out from the main heat exchanger 210 of the reactor and flows back to the main heat exchanger 210 after heat exchange in the system.

[0047] The supercritical carbon dioxide Brayton cycle thermoelectric conversion system 100 includes a Brayton cycle thermoelectric conversion component 101 , a regenerator 14 , a gas cooling and compression component 102 , and a dry gas sealing and boosting device 16 . The Brayton cycle thermoelectric conversion component 101 is configured to receive supercritical carbon dioxide from the main heat exchanger 210 and convert it from thermal energy into electrical energy; the regenerator 14 is configured to receive supercritical carbon dioxide from the Brayton cycle thermoelectric conversion component 101; the gas cooling and compression component 102 is configured to receive gas from the regenerator 14, cool it and compress it, and the regenerator 14 is also configured to receive supercritical carbon dioxide from the gas cooling and compression component 102 after compression, and make it heat exchange with the supercritical carbon dioxide from the Brayton cycle thermoelectric conversion component 101 after action, and the supercritical carbon dioxide after the heat exchange flows back to the main heat exchanger 210 of the reactor; the dry gas sealing booster 16 is configured to be able to communicate with the fluid of the components that need gas sealing in the Brayton cycle thermoelectric conversion component 101, and provide high-pressure supercritical carbon dioxide to the components, and the dry gas sealing booster 16 is configured to take gas from the system and make the gas meet the predetermined temperature requirements.

[0048] The supercritical carbon dioxide Brayton cycle thermoelectric conversion system 100 provided in the embodiment of the present application takes gas from the system through a dry gas sealing booster device 16, and makes the gas meet the predetermined temperature requirement, so that there is no need to heat the gas used for dry gas sealing, thereby avoiding an increase in the system's own electricity consumption, which is beneficial to increasing the output electrical power and improving the thermoelectric conversion efficiency.

[0049] In some embodiments, the Brayton cycle thermoelectric conversion assembly 101 may include a turbine 11 and a generator 13. The turbine 11 is configured to receive supercritical carbon dioxide from the main heat exchanger 210 and convert it from thermal energy to kinetic energy; the generator 13 is configured to receive kinetic energy from the turbine 11 and convert it into electrical energy.

[0050] In some embodiments, the gas cooling and compression assembly 102 may include a cooler 15 and a compressor 12. The cooler 15 is configured to receive the supercritical carbon dioxide from the regenerator 14 and cool it; the compressor 12 is configured to receive the cooled supercritical carbon dioxide from the cooler 15 and compress it.

[0051] In some embodiments, the dry gas seal booster 16 is provided with a first gas intake branch 1601 between the regenerator 14 and the gas cooling and compression assembly 102, and the dry gas seal booster 16 is provided with a second gas intake branch 1602 between the regenerator 14 and the main heat exchanger 210; the gas obtained by the first gas intake branch 1601 is mixed with the gas obtained by the second gas intake branch 1602 to obtain a gas that meets the predetermined temperature requirement. Since the temperature of the supercritical carbon dioxide between the regenerator 14 and the main heat exchanger 210 is relatively high, and the temperature of the supercritical carbon dioxide between the regenerator 14 and the gas cooling and compression assembly 102 is relatively low, therefore, in such an embodiment, the gas taken out of the first gas intake branch 1601 and the gas taken out of the second gas intake branch 1602 are mixed, so that the supercritical carbon dioxide with a higher temperature and the supercritical carbon dioxide with a lower temperature can exchange heat, which is conducive to adjusting the temperature of the taken out supercritical carbon dioxide to meet the predetermined temperature requirement.

[0052] In some embodiments, the first gas intake branch 1601 and the second gas intake branch 1602 are respectively configured to be able to adjust the flow of the first gas intake branch 1601 and the flow of the second gas intake branch 1602, so that the mixed gas meets the temperature requirements. In such an embodiment, by adjusting the flow of the first gas intake branch 1601 and the second gas intake branch 1602, the amount of supercritical carbon dioxide with a higher temperature and the amount of supercritical carbon dioxide with a lower temperature taken out can be adjusted, so that the gas after heat exchange can meet the predetermined temperature requirements.

[0053] The supercritical carbon dioxide Brayton cycle thermoelectric conversion system 100 provided in the embodiment of the present application is beneficial to simplify the supporting facilities of the dry gas seal and reduce the footprint of the dry gas seal by setting a dry gas seal booster device 16, which is beneficial to reduce the miniaturization cost of the lead-bismuth stack and improve the economic benefits of thermoelectric conversion.

[0054] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0055] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A supercritical carbon dioxide Brayton cycle thermoelectric conversion system, wherein supercritical carbon dioxide flows out from the main heat exchanger of the reactor, flows back to the main heat exchanger after heat exchange in the system, characterized in that: It includes: Turbines, compressors, generators, regenerators, coolers and dry gas seal boosters, The turbine is configured to receive supercritical carbon dioxide from the main heat exchanger and convert the supercritical carbon dioxide from thermal energy into kinetic energy. The generator is configured to receive kinetic energy from the turbine and convert it into electrical energy. The regenerator is configured to receive supercritical carbon dioxide from the turbine. The cooler is configured to receive the supercritical carbon dioxide from the regenerator and cool it; The compressor is configured to receive the cooled supercritical carbon dioxide from the cooler and compress it; The regenerator is further configured to receive the supercritical carbon dioxide after being compressed by the compressor and perform heat exchange with the supercritical carbon dioxide after being acted on by the turbine, and the supercritical carbon dioxide after the heat exchange flows back to the main heat exchanger of the reactor; The dry gas seal booster device is configured to be fluidly connected to the turbine and the compressor and provide high-pressure supercritical carbon dioxide to the turbine and the compressor. The dry gas seal booster device is configured to take gas from the system and make the gas meet a predetermined temperature requirement.

2. The system according to claim 1, characterized in that The dry gas seal booster device is provided with a first air intake branch between the regenerator and the compressor. The dry gas seal booster device is provided with a second gas intake branch between the regenerator and the main heat exchanger; The gas obtained by the first gas intake branch is mixed with the gas obtained by the second gas intake branch to obtain gas meeting a predetermined temperature requirement.

3. The system according to claim 2, characterized in that The first gas intake branch and the second gas intake branch are respectively configured to be able to adjust the flow rate of the first gas intake branch and the flow rate of the second gas intake branch so that the mixed gas meets the temperature requirement.

4. The system according to claim 3, characterized in that A first regulating valve is provided on the first gas intake branch, and a second regulating valve is provided on the second gas intake branch. The first regulating valve and the second regulating valve are configured to regulate the flow rate of gas so that the gas obtained from the first gas intake branch is mixed with the gas obtained from the second gas intake branch to obtain gas meeting a predetermined temperature requirement.

5. The system according to claim 3, characterized in that The flow rates of the first gas intake branch and the second gas intake branch are adjusted in the following manner: T = (aT1 + bT2); a=Q1 / (Q1+Q2); b = Q2 / (Q1+Q2); T is the temperature of the mixed gas, T1 is the temperature of the gas in the first gas branch, T2 is the temperature of the gas in the second gas branch, Q1 is the flow rate of the gas in the first gas branch, and Q2 is the flow rate of the gas in the second gas branch.

6. The system according to any one of claims 1 to 5, characterized in that: It also includes a dry gas supplement device, which is configured to provide high-pressure supercritical carbon dioxide to the turbine and the compressor when the dry gas seal booster device fails.

7. The system according to claim 6, characterized in that The dry gas supplement device comprises a supplementary gas source, a first circuit breaker valve and a second circuit breaker valve. The supplementary air source is configured to be in fluid communication with the turbine and the compressor. The first cut-off valve is configured to control the fluid connection or disconnection between the supplementary air source and the turbine and the compressor; The second cut-off valve is configured to control the fluid connection or disconnection between the dry gas seal booster device and the turbine and the compressor. When the first shut-off valve is configured to connect the supplementary gas source with the turbine and the compressor fluid, the second shut-off valve is configured to disconnect the dry gas seal booster device from the turbine and the compressor fluid; When the first shut-off valve is configured to disconnect the supplementary gas source from the turbine and the compressor fluid, the second shut-off valve is configured to connect the dry gas seal boosting device to the turbine and the compressor fluid.

8. A supercritical carbon dioxide Brayton cycle thermoelectric conversion system, wherein supercritical carbon dioxide flows out from the main heat exchanger of the reactor, and flows back to the main heat exchanger after heat exchange in the system, characterized in that: It includes: A Brayton cycle thermoelectric conversion component, which is configured to receive supercritical carbon dioxide from the main heat exchanger and convert it from thermal energy into electrical energy; a regenerator configured to receive supercritical carbon dioxide from the Brayton cycle thermoelectric conversion assembly; a gas cooling and compression assembly configured to receive the gas from the regenerator, cool it, and compress it, The regenerator is further configured to receive supercritical carbon dioxide after being compressed by the gas cooling and compression assembly, and to perform heat exchange with supercritical carbon dioxide after being acted upon by the Brayton cycle thermoelectric conversion assembly, and the supercritical carbon dioxide after the heat exchange flows back to the main heat exchanger of the reactor; A dry gas seal booster device, wherein the dry gas seal booster device is configured to be fluidically connected to a component in the Brayton cycle thermoelectric conversion assembly that requires gas sealing, and to provide high-pressure supercritical carbon dioxide to the component. The dry gas seal booster device is configured to take gas from the system and make the gas meet a predetermined temperature requirement.

9. The system according to claim 8, characterized in that The dry gas seal booster device is provided with a first gas intake branch between the regenerator and the gas cooling and compression assembly. The dry gas seal booster device is provided with a second gas intake branch between the regenerator and the main heat exchanger; The gas obtained by the first gas intake branch is mixed with the gas obtained by the second gas intake branch to obtain gas meeting a predetermined temperature requirement.

10. The system according to claim 9, characterized in that The first gas intake branch and the second gas intake branch are respectively configured to be able to adjust the flow rate of the first gas intake branch and the flow rate of the second gas intake branch so that the mixed gas meets the temperature requirement.

Images