A supercritical carbon dioxide power generation method, device, storage medium and system

Abstract

The present invention discloses a supercritical carbon dioxide power generation method, device, storage medium and system. By determining actual conditions such as the power generation working mode and the change of power generation scenarios through the operating parameter set of the integrated power generation and energy storage system, corresponding methods are adaptively adopted for power generation according to the power generation working mode and the change of power generation scenarios. The supercritical carbon dioxide power generation method, device, storage medium and system improve the flexible adaptability of power storage and generation to actual demands; further, a supercritical carbon dioxide power generation method, device, storage medium and system provided by the present invention also stores the pressure energy of high-pressure supercritical carbon dioxide and classifies and stores the excess heat energy of the system, thereby further improving the economy and utilization efficiency of energy storage.

Description

Technical Field

[0001] The present invention relates to the technical field of supercritical carbon dioxide power generation, and particularly to a supercritical carbon dioxide power generation method, device, computer-readable storage medium and system. Background Art

[0002] A supercritical carbon dioxide power generation system is a Brayton power generation cycle system using supercritical carbon dioxide as the heat energy cycle working medium, which has significant advantages such as high thermoelectric conversion efficiency, small volume of power equipment and system, simple and compact structure, and good flexibility. It only requires an external temperature of 500 - 800 degrees Celsius. At the same temperature level, the power generation efficiency of the supercritical carbon dioxide Brayton cycle power generation system is more than 5 percentage points higher than that of the traditional steam Rankine cycle power generation system. As a cutting-edge power generation technology, supercritical carbon dioxide power generation has broad engineering application prospects in the fields of thermal power generation such as traditional thermal power, nuclear power, solar thermal power, and dry hot rock geothermal energy.

[0003] However, the existing technology still has the following defects: when used in various thermal power generation fields, it cannot efficiently and economically store the excess heat energy of the system, the coupling degree of power generation and energy storage is not high, and when the load or the heat quantity of the heat source changes, it cannot flexibly adjust the flow rate of the working medium entering the power generation system, cannot achieve flexible adjustment of the external power output, cannot match the actual power generation needs, and there is a problem of low power generation flexibility.

[0004] Therefore, there is a need for a supercritical carbon dioxide power generation method, device, computer-readable storage medium and system to overcome the above-mentioned defects existing in the prior art. Summary of the Invention

[0005] Embodiments of the present invention provide a supercritical carbon dioxide power generation method, device, computer-readable storage medium and system, so as to improve the flexible adaptability of power generation and storage to actual needs.

[0006] An embodiment of the present invention provides a supercritical carbon dioxide power generation method, and the power generation method includes: obtaining an operation parameter set of a power generation and energy storage integrated system, and determining a power generation working mode and a change situation of a power generation scenario according to the operation parameter set; the power generation working mode includes a working medium power generation mode and an energy storage power generation mode; the change situation of the power generation scenario is a load reduction and a load increase; the power generation and energy storage integrated system includes an energy storage module, a main power generation module, and a heat supply module; when the power generation working mode is the energy storage power generation mode, the main power generation module is driven by the energy storage module to generate power; when the power generation working mode is the working medium power generation mode and the change situation of the power generation scenario is a load reduction, the first working medium flow rate flowing into the main power generation module is reduced according to a preset first working medium flow rate adjustment method, and working medium power generation and energy storage are performed through supercritical carbon dioxide with the first working medium flow rate; when the power generation working mode is the working medium power generation mode and the change situation of the power generation scenario is a load increase, the second working medium flow rate flowing into the energy storage module and the third working medium flow rate flowing into the heat supply module are adjusted according to a preset second working medium flow rate adjustment method, and working medium power generation and energy storage are performed through supercritical carbon dioxide with the second working medium flow rate and the third working medium flow rate.

[0007] As an improvement of the above solution, the power generation method further includes: when the power generation working mode is the working medium power generation mode and the change situation of the power generation scenario is peak power consumption, the main power generation module is operated in a full-load manner to generate power, and the fourth working medium flow rate flowing into the auxiliary power generation module is increased, so as to perform working medium power generation through supercritical carbon dioxide according to the fourth working medium flow rate.

[0008] As an improvement of the above solution, the power generation method further includes: when the power generation working mode is the working medium power generation mode and the change situation of the power generation scenario is excessive heat supply, the fifth working medium flow rate flowing into the energy storage module is increased to perform energy storage.

[0009] As an improvement of the above solution, the power generation method further includes: when the power generation working mode is the working medium power generation mode and the change situation of the power generation scenario is insufficient heat supply, the supercritical carbon dioxide is supplemented and heated by a high-temperature heat storage device in the energy storage module to perform working medium power generation through supercritical carbon dioxide.

[0010] As an improvement of the above solution, the power generation method further includes: when the power generation working mode is the working medium power generation mode and the change situation of the power generation scenario is a heat supply failure, the energy storage module releases energy to perform working medium power generation through supercritical carbon dioxide.

[0011] As an improvement of the above solution, the energy storage module is used for separately storing thermal energy and pressure energy.

[0012] As an improvement of the above solution, the energy storage module is further configured to classify and store the thermal energy according to the temperature of the thermal energy.

[0013] Another embodiment of the present invention correspondingly provides a supercritical carbon dioxide power generation device. The power generation device includes a mode determination unit, an energy storage power generation unit, and a working fluid power generation unit. Among them, the mode determination unit is configured to obtain an operation parameter group of a power generation and energy storage integrated system, and determine a power generation working mode and a change situation of a power generation scenario according to the operation parameter group; the power generation working mode includes a working fluid power generation mode and an energy storage power generation mode; the change situation of the power generation scenario is a decrease in load and an increase in load; the power generation and energy storage integrated system includes an energy storage module, a main power generation module, and a heat supply module; the energy storage power generation unit is configured to drive the main power generation module to generate power through the energy storage module when the power generation working mode is the energy storage power generation mode; the working fluid power generation unit is configured to reduce the first working fluid flow rate flowing into the main power generation module according to a preset first working fluid flow rate adjustment method and perform working fluid power generation and energy storage through supercritical carbon dioxide with the first working fluid flow rate when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is a decrease in load; when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is an increase in load, adjust the second working fluid flow rate flowing into the energy storage module and the third working fluid flow rate flowing into the heat supply module according to a preset second working fluid flow rate adjustment method, and perform working fluid power generation and energy storage through supercritical carbon dioxide with the second working fluid flow rate and the third working fluid flow rate.

[0014] As an improvement of the above solution, the working fluid power generation unit is further configured to: when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is peak power consumption, operate the main power generation module in a full-load manner to generate power, and increase the fourth working fluid flow rate flowing into the auxiliary power generation module, and perform working fluid power generation through supercritical carbon dioxide according to the fourth working fluid flow rate.

[0015] As an improvement of the above solution, the working fluid power generation unit is further configured to: when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is excessive heat supply, increase the fifth working fluid flow rate flowing into the energy storage module to perform energy storage.

[0016] As an improvement of the above solution, the working fluid power generation unit is further configured to: when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is insufficient heat supply, supplement and heat the supercritical carbon dioxide through a high-temperature heat storage device in the energy storage module to perform working fluid power generation through supercritical carbon dioxide.

[0017] As an improvement of the above solution, the working fluid power generation unit is further configured to: when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is a heat supply failure, release energy through the energy storage module, so as to generate power with the working fluid through supercritical carbon dioxide.

[0018] Another embodiment of the present invention provides a computer-readable storage medium, which includes a stored computer program. Wherein, when the computer program runs, it controls the device where the computer-readable storage medium is located to execute the supercritical carbon dioxide power generation method as described above.

[0019] Another embodiment of the present invention provides a supercritical carbon dioxide power generation system, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the supercritical carbon dioxide power generation method as described above.

[0020] Compared with the prior art, the present technical solution has the following beneficial effects:

[0021] The present invention provides a supercritical carbon dioxide power generation method, device, computer-readable storage medium, and system. By determining actual situations such as the power generation working mode and the change situation of the power generation scenario through the operation parameter group of the integrated power generation and energy storage system, corresponding methods are adaptively adopted for power generation according to the power generation working mode and the change situation of the power generation scenario. This method, device, computer-readable storage medium, and system improve the flexible adaptability of energy storage power generation and actual demands.

[0022] Furthermore, the supercritical carbon dioxide power generation method, device, computer-readable storage medium, and system provided by the present invention also store the pressure energy of high-pressure supercritical carbon dioxide and classify and store the excess heat energy of the system, thereby further improving the economy and utilization efficiency of energy storage. Description of the Drawings

[0023] Figure 1 is a schematic flowchart of a supercritical carbon dioxide power generation method provided by an embodiment of the present invention;

[0024] Figure 2 is a schematic structural diagram of a supercritical carbon dioxide power generation device provided by an embodiment of the present invention;

[0025] Figure 3 is an exemplary implementation structure diagram of a supercritical carbon dioxide power generation system provided by an embodiment of the present invention. Detailed Embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Specific Embodiment 1

[0028] An embodiment of the present invention first describes a supercritical carbon dioxide power generation method. Figure 1 It is a schematic flowchart of a supercritical carbon dioxide power generation method provided by an embodiment of the present invention.

[0029] As Figure 1 shown, the supercritical carbon dioxide power generation method includes:

[0030] S1: Obtain an operation parameter group of the power generation and energy storage integrated system, and determine a power generation working mode and a change situation of the power generation scenario according to the operation parameter group.

[0031] In order to adapt to the power generation demand that may change in real time during switching and achieve flexible power generation, an embodiment of the present invention first needs to obtain the operation parameters of the power generation and energy storage integrated system to determine the current power generation working mode (described as "power generation working mode" in this article) and the changing power generation demand (described as "change situation of the power generation scenario" in this article).

[0032] The power generation working mode includes a working medium power generation mode and an energy storage power generation mode; the change situation of the power generation scenario is load reduction, load increase, peak power consumption, excess heat supply, insufficient heat supply, and heat supply failure; the power generation and energy storage integrated system includes an energy storage module, a main power generation module, and a heat supply module. Among them, the energy storage module includes but is not limited to a high-temperature heat storage device, a low-temperature heat storage device, a pressure storage device, and a gas storage device; the main power generation module includes but is not limited to a main Reuters flat and a main road generator; the heat supply module includes but is not limited to a compressor and a heat source unit.

[0033] S21: When the power generation working mode is the energy storage power generation mode, drive the main power generation module to generate power through the energy storage module.

[0034] S22: When the power generation working mode is the working medium power generation mode and the change situation of the power generation scenario is load reduction, reduce the first working medium flow rate flowing into the main power generation module according to a preset first working medium flow rate adjustment method, and use the first working medium flow rate to generate power and store energy through supercritical carbon dioxide.

[0035] When the load needs to be reduced, while keeping the working fluid flow rate through the compressor and the heat source unit unchanged, reduce the main louden output to reduce the load, and effectively store the excess heat and excess electric energy.

[0036] S32: When the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is an increase in load, adjust the second working fluid flow rate flowing into the energy storage module and the third working fluid flow rate flowing into the heat supply module according to a preset second working fluid flow rate adjustment method, and perform working fluid power generation and energy storage through supercritical carbon dioxide with the second working fluid flow rate and the third working fluid flow rate.

[0037] When the load needs to be increased, while keeping the working fluid flow rate through the compressor and the heat source unit unchanged, reduce the working fluid flow rate flowing into the energy storage subsystem and increase the working fluid flow rate flowing into the main louden, thereby increasing the expansion work of the main louden to increase the load.

[0038] When it is at the peak electricity consumption, the working fluid flow rate in the main circuit power generation cycle maintains full-load operation, and gradually increases the working fluid flow rate flowing into the auxiliary louden, thereby increasing the power generation amount of the auxiliary generator to meet the electricity demand at the peak electricity consumption. That is, in one embodiment, the power generation method further includes: when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is peak electricity consumption, operate the main power generation module in a full-load manner to generate electricity, and increase the fourth working fluid flow rate flowing into the auxiliary power generation module, and perform working fluid power generation through supercritical carbon dioxide according to the fourth working fluid flow rate; thus, by setting the auxiliary louden unit to do work during peak electricity consumption, the single-unit installed capacity of the main louden can be reduced, and the investment is reduced.

[0039] When the heat source unit has sufficient and excessive heat, maintain the normal main circuit power generation cycle, and gradually increase the working fluid flow rate flowing into the energy storage subsystem, and store the excessive heat in the energy storage subsystem in the form of heat energy and pressure energy. That is, in one embodiment, the power generation method further includes: when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is excessive heat supply, increase the fifth working fluid flow rate flowing into the energy storage module to perform energy storage.

[0040] When the heat supply of the heat source unit is insufficient, perform supplementary heating through the high-temperature heat storage device to enable the power generation system to work normally. That is, in one embodiment, the power generation method further includes: when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is insufficient heat supply, perform supplementary heating on supercritical carbon dioxide through the high-temperature heat storage device in the energy storage module to perform working fluid power generation through supercritical carbon dioxide. When performing supplementary heating, drive the main power generation module to perform working fluid power generation through supercritical carbon dioxide. When the main power generation module generates insufficient electricity, the auxiliary power generation module is also enabled at the same time.

[0041] When there is no heat supply from the heat source unit or when the compressor fails, the energy storage subsystem is used to release energy to drive the main and auxiliary turbine runners to expand and do work, so that the power generation system can operate normally. That is, in one embodiment, the power generation method further includes: when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is a heat supply failure, the energy storage module releases energy to generate power with the working fluid through supercritical carbon dioxide.

[0042] In order to improve the economy and accommodatability of the storage technology, in one embodiment, the energy storage module is used to separately store thermal energy and pressure energy. Specifically, high-pressure supercritical carbon dioxide is generated by compressing gaseous carbon dioxide, and a pressure storage device is used for pressure storage to store part of the excess thermal energy in the system in the form of pressure energy. In this way, both thermal energy and the pressure energy of compressed carbon dioxide are stored. When the electricity consumption peak occurs or when the heat source unit needs to release energy without heat, the pressure storage device releases pressure, and the high-pressure supercritical carbon dioxide working fluid exchanges heat with the low-temperature heat storage device and the high-temperature heat storage device in sequence to extract the low-temperature thermal energy and high-temperature thermal energy stored in the energy storage system, without consuming additional fuel, and without consuming power or electricity during the energy release stage, and can drive the turbine to do work.

[0043] In one embodiment, the energy storage module is further used to classify and store the thermal energy according to the temperature of the thermal energy; specifically, a high-temperature heat storage device is set to store high-temperature thermal energy, and a low-temperature heat storage device is set to store low-temperature thermal energy, so that the pressurized working fluid in the supercritical carbon dioxide storage tank in the pressure storage device can be stored at a lower temperature, improving the system safety; at the same time, during the energy release process, the low-temperature thermal energy is used to preheat the carbon dioxide working fluid, improving the system waste heat utilization rate.

[0044] The embodiment of the present invention describes a supercritical carbon dioxide power generation method. By determining the actual situations such as the power generation working mode and the change situation of the power generation scenario through the operation parameter group of the integrated power generation and energy storage system, the corresponding power generation method is adaptively adopted according to the power generation working mode and the change situation of the power generation scenario. This supercritical carbon dioxide power generation method improves the flexible adaptability of power generation and storage to actual needs; further, a supercritical carbon dioxide power generation method described in the embodiment of the present invention also stores the pressure energy of high-pressure supercritical carbon dioxide and classifies and stores the excess thermal energy in the system, thereby further improving the economy and utilization efficiency of energy storage. Specific Embodiment Two

[0046] In addition to the above method, the embodiment of the present invention also discloses a supercritical carbon dioxide power generation device. Figure 2 It is a schematic structural diagram of a supercritical carbon dioxide power generation device provided by an embodiment of the present invention.

[0047] As Figure 2 shown, the power generation device includes a mode determination unit 101, an energy storage power generation unit 102, and a working fluid power generation unit 103.

[0048] The mode determination unit 101 is configured to obtain an operation parameter group of the integrated power generation and energy storage system, and determine a power generation working mode and a change situation of the power generation scenario according to the operation parameter group. The power generation working mode includes a working fluid power generation mode and an energy storage power generation mode; the change situation of the power generation scenario is a decrease in load and an increase in load; the integrated power generation and energy storage system includes an energy storage module, a main power generation module, and a heat supply module.

[0049] The energy storage power generation unit 102 is configured to drive the main power generation module to generate power through the energy storage module when the power generation working mode is the energy storage power generation mode.

[0050] The working fluid power generation unit 103 is configured to, when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is a decrease in load, reduce the first working fluid flow rate flowing into the main power generation module according to a preset first working fluid flow rate adjustment method, and perform working fluid power generation and energy storage through supercritical carbon dioxide with the first working fluid flow rate; when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is an increase in load, adjust the second working fluid flow rate flowing into the energy storage module and the third working fluid flow rate flowing into the heat supply module according to a preset second working fluid flow rate adjustment method, and perform working fluid power generation and energy storage through supercritical carbon dioxide with the second working fluid flow rate and the third working fluid flow rate.

[0051] In one embodiment, the working fluid power generation unit 103 is further configured to: when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is peak power consumption, operate the main power generation module in a full-load manner to generate power, and increase the fourth working fluid flow rate flowing into the auxiliary power generation module, so as to perform working fluid power generation through supercritical carbon dioxide according to the fourth working fluid flow rate.

[0052] In one embodiment, the working fluid power generation unit 103 is further configured to: when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is excessive heat supply, increase the fifth working fluid flow rate flowing into the energy storage module to perform energy storage.

[0053] In one embodiment, the working fluid power generation unit 103 is further configured to: when the power generation working mode is the working fluid power generation mode and the change situation of the power generation scenario is insufficient heat supply, supplement and heat supercritical carbon dioxide through a high-temperature heat storage device in the energy storage module to perform working fluid power generation through supercritical carbon dioxide.

[0054] In one embodiment, the working fluid power generation unit 103 is further configured to: when the power generation mode is the working fluid power generation mode and the change condition of the power generation scenario is a heating failure, release energy through the energy storage module to generate power with the working fluid by means of supercritical carbon dioxide.

[0055] Wherein, if the unit integrated in the supercritical carbon dioxide power generation device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above-mentioned embodiment methods of the present invention, it can also be completed by a computer program instructing relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-mentioned method embodiments can be implemented. That is, another embodiment of the present invention provides a computer-readable storage medium, and the computer-readable storage medium includes a stored computer program, wherein when the computer program runs, it controls the device where the computer-readable storage medium is located to execute the supercritical carbon dioxide power generation method as described above.

[0056] Wherein, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0057] It should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the device embodiments provided by the present invention, the connection relationship between units indicates that they have a communication connection, which can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0058] Embodiments of the present invention describe a supercritical carbon dioxide power generation device and a computer-readable storage medium. By determining actual situations such as the power generation working mode and changes in the power generation scenario through the operation parameter set of the power generation and energy storage integrated system, power generation is adaptively carried out in a corresponding manner according to the power generation working mode and changes in the power generation scenario. The supercritical carbon dioxide power generation device and the computer-readable storage medium improve the flexible adaptability of power storage and generation to actual demands; further, the supercritical carbon dioxide power generation device and the computer-readable storage medium described in the embodiments of the present invention also store the pressure energy of high-pressure supercritical carbon dioxide and classify and store the excess heat energy of the system, thereby further improving the economy and utilization efficiency of energy storage. Specific Embodiment Three

[0060] In addition to the above methods and devices, embodiments of the present invention also describe a supercritical carbon dioxide power generation system.

[0061] The power generation system includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it controls each functional component included in the power generation system to implement the supercritical carbon dioxide power generation method as described above.

[0062] To further describe the present invention, reference is made to Figure 3 , and embodiments of the present invention are exemplarily but not restrictively described with a power generation system as an example. In Figure 3 , 1 - compressor; 2 - heat source unit; 3 - main path leveling; 4 - cooler; 5 - auxiliary path leveling; 6 - motor; 7 - main path generator; 8 - auxiliary path generator; 9 - main path leveling regulating valve; 10 - auxiliary path leveling regulating valve; 11 - main circuit valve; 12 - energy storage shunt regulating valve; 13 - high-temperature heat storage device; 14 - low-temperature heat exchanger; 15 - low-temperature heater; 16 - low-temperature heat tank; 17 - low-temperature heat tank outlet valve; 18 - low-temperature heat tank medium pump; 19 - low-temperature cold tank; 20 - low-temperature cold tank outlet valve; 21 - low-temperature cold tank medium pump; 22 - pressure storage inlet valve; 23 - supercritical carbon dioxide storage tank; 24 - pressure storage outlet valve; 25 - gas storage reservoir inlet valve; 26 - gas storage cooler; 27 - gas storage reservoir; 28 - gas storage reservoir outlet valve; 29 - heat supplement circulation bypass; 30 - heat supplement bypass valve; 31 - buffer tank.

[0063] The ambient temperature and pressure flexible gas storage reservoir therein is a super-large-size flexible gas storage reservoir with a very large storage capacity. The single gas storage reservoir volume is generally of the order of 100,000 m 3 and 1,000,000 m 3 levels, and the maximum single volume can reach 10,000,000 m 3As mentioned above, it can greatly increase the storage volume of the energy storage working medium in the atmospheric state, thereby providing a carbon dioxide long-term pressure energy storage system with greater power. It can support the construction of an ultra-large power long-term energy storage system for power plants with a capacity above GW. Therefore, a larger-scale power generation and energy storage coupling system can be built, with higher comprehensive utilization value, suitable for large-scale thermal energy development, especially for large-scale solar thermal resources and dry hot rock geothermal energy development.

[0064] In actual implementation, the power generation system further includes a power generation subsystem and an energy storage subsystem; the power generation subsystem includes a compressor 1, a heat source unit 2, a turbine, a cooler 4 and a generator, and the compressor 1, the heat source unit 2, the turbine and the cooler 4 are connected in sequence to form a circulation loop; the energy storage subsystem includes a high-temperature heat storage device 13, a low-temperature heat storage device, a pressure storage device and a gas storage device. The energy storage subsystem stores both high-temperature thermal energy, low-temperature thermal energy, and the pressure energy of compressed carbon dioxide, enabling the turbine to do work without additional fuel consumption or power consumption during energy release, greatly improving the system economy.

[0065] Specifically, the outlet of the gas storage device is connected to the inlet of the compressor 1, and is connected to the inlet of the pressure storage device through the compressor 1, the heat source unit 2, the high-temperature heat storage device 13, and the low-temperature heat storage device connected in sequence. When the heat source has sufficient heat or the load decreases, excess heat and electrical energy can be stored through high-temperature heat storage, low-temperature heat storage, and compressed gas pressure storage; the outlet of the pressure storage device is connected to the inlet of the gas storage device through the low-temperature heat storage device, the high-temperature heat storage device 13, the turbine, and the cooler 4 connected in sequence. When the heat source has no heat or insufficient heat, or during peak electricity consumption, or when the compressor fails, the turbine can be driven to expand and do work and drive the generator to generate electricity through high-temperature heat release, low-temperature heat release, and pressure release, effectively ensuring the normal operation of the system.

[0066] The system uses supercritical carbon dioxide as the power working fluid, heat transfer working fluid and pressure storage working fluid, and integrally sets up a power generation, heat storage and pressure storage coupling system, so that excess heat and electric energy can be stored while generating electricity. When the heat source unit 2 lacks heat, or there is no heat supply, or the compressor 1 fails, the energy storage subsystem can release energy to ensure the normal operation of the power generation subsystem, enabling the organic combination of power generation and energy storage, and a high coupling degree between the power generation system and the energy storage system. Among them, an energy storage shunt regulating valve 12 is arranged at the inlet of the energy storage subsystem, which can adjust the flow rate of the working fluid entering the energy storage subsystem. Further, through the cooperation of the energy storage shunt regulating valve, the energy storage subsystem and the power generation subsystem, the flow rate of the working fluid entering the main flow path turbine or the auxiliary flow path turbine can be adjusted to achieve power change, realize the operation control of the load change process under different working conditions, match the actual power generation needs to achieve stable power supply, greatly improve the flexibility and economy of the system, and make the system have advantages in aspects such as power generation on demand and power generation flexibility.

[0067] The turbine includes a main flow path turbine 3 and an auxiliary flow path turbine 5. A main flow path turbine regulating valve 9 is arranged at the inlet of the main flow path turbine 3, which is used to adjust the flow rate of the working fluid entering the main flow path turbine 3 so that the main flow path turbine unit can adapt to the load change, and the main flow path turbine 3 is connected to the main flow path generator 7 to further match the actual power generation needs, thereby further improving the flexibility of the system. A bypass is arranged between the inlet and the outlet of the main flow path turbine regulating valve 9 with the auxiliary flow path turbine 5 and the auxiliary flow path generator 8. The auxiliary flow path turbine 5 is connected to the auxiliary flow path generator 8, which is suitable for expanding and doing work during the peak electricity consumption period to increase the power generation of the system. According to the above description, by setting the auxiliary flow path turbine unit to do work during the peak electricity consumption period, the single-unit installed capacity of the main flow path turbine can be reduced, the full-load working time of the main flow path turbine can be extended, with good economy and reduced system investment. An auxiliary flow path turbine regulating valve 10 is arranged at the inlet of the auxiliary flow path turbine 5, which is used to adjust the flow rate of the working fluid entering the auxiliary flow path turbine 5 so that the auxiliary flow path turbine unit can adapt to the load change during the peak electricity consumption period, thereby matching the actual power generation needs during the peak electricity consumption period and further improving the flexibility of the system. The main flow path turbine 3 and the auxiliary flow path turbine 5 are both at least one group, so that the system can be applicable to different load requirements. Each group of the main flow path turbine 3 and each group of the auxiliary flow path turbine 5 include single-stage or multi-stage turbine expanders, and the arrangement methods of each group of the main flow path turbine 3 and each group of the auxiliary flow path turbine 5 are not limited to Figure 3 the arrangement part included in

[0068] The high-temperature heat storage device 13 has a heat storage form of sensible heat, latent heat, or chemical reaction heat, or a combination of several of them. Its heat exchange form is that the heat transfer fluid exchanges heat with the heat storage medium through the heat exchange surface or directly contacts the heat storage material. The heat storage media used include, but are not limited to, molten salt and heat-conducting oil. The heat storage materials used include, but are not limited to, metals and their alloys, rocks, or concrete. According to the above description, by setting up the high-temperature heat storage device to store the excess heat energy in the system, the heat source system can operate at full load, and the daily heat energy output of the heat source unit can be directly increased. Its heat storage technology is also much more mature and cheaper than other large-scale energy storage technologies.

[0069] The low-temperature heat storage device includes a low-temperature heat exchanger 14, a low-temperature heater 15, a low-temperature hot tank 16, and a low-temperature cold tank 19. The low-temperature heat storage media filled in the low-temperature hot tank 16 and the low-temperature cold tank 19 both include water. By setting up the low-temperature heat storage device, during the energy storage process, the low-grade heat energy with a relatively low temperature after high-temperature heat exchange is recovered and stored in the low-temperature hot tank 16. During the energy release process, the low-grade heat energy stored in the low-temperature hot tank 16 preheats the carbon dioxide working fluid through the low-temperature heater 15, and the low-grade heat energy can be converted into high-grade electric energy, improving the waste heat utilization rate of the system.

[0070] The cold-side outlet of the low-temperature heat exchanger 14 is connected to the inlet of the low-temperature hot tank 16; the cold-side inlet of the low-temperature heat exchanger 14 is connected to the outlet of the low-temperature cold tank 19; a low-temperature cold tank outlet valve 20 and a low-temperature cold tank medium pump 21 are arranged on the outlet pipeline of the low-temperature cold tank 19 in the direction of fluid flow.

[0071] The hot-side outlet of the low-temperature heater 15 is connected to the inlet of the low-temperature cold tank 19; the hot-side inlet of the low-temperature heater 15 is connected to the outlet of the low-temperature hot tank 16; a low-temperature hot tank outlet valve 17 and a low-temperature hot tank medium pump 18 are arranged on the outlet pipeline of the low-temperature hot tank 16 in the direction of fluid flow.

[0072] The pressure storage device includes a pressure storage inlet valve 22, a supercritical carbon dioxide storage tank 23, and a pressure storage outlet valve 24 connected in sequence. The pressure storage medium of the supercritical carbon dioxide storage tank 23 is supercritical carbon dioxide, and there is at least one supercritical carbon dioxide storage tank 23. According to the structure described above, by compressing gaseous carbon dioxide to generate high-pressure supercritical carbon dioxide and using the pressure storage device for pressure storage, part of the excess heat energy in the system is stored in the form of pressure energy, which is more economical than other electric energy storage technologies and has a larger energy storage scale.

[0073] The outlet of the heat source unit 2 is divided into two paths, one of which is connected to the inlets of both the main flow path flat 3 and the auxiliary flow path flat 5; the other path is connected to the hot side inlet of the high-temperature heat storage device 13 through the energy storage shunt regulating valve 12. The hot side outlet of the high-temperature heat storage device 13 is connected to the hot side inlet of the low-temperature heat exchanger 14. The hot side outlet of the low-temperature heat exchanger 14 is connected to the inlet of the supercritical carbon dioxide storage tank 23 through the pressure storage inlet valve 22. The outlet of the supercritical carbon dioxide storage tank 23 is connected to the cold side inlet of the low-temperature heater 15 through the pressure storage outlet valve 24. The cold side outlet of the low-temperature heater 15 is connected to the cold side inlet of the high-temperature heat storage device 13. The cold side outlet of the high-temperature heat storage device 13 is connected to the inlets of both the main flow path flat 3 and the auxiliary flow path flat 5. According to the above-described structure and its connections, when energy storage is required, the energy storage subsystem stores both high-temperature heat energy and low-temperature heat energy, as well as the pressure energy of compressed carbon dioxide. When energy release is required, the pressure storage device releases pressure, and the high-pressure supercritical carbon dioxide working medium exchanges heat with the low-temperature heat storage device and the high-temperature heat storage device in sequence, extracting the low-temperature heat energy and high-temperature heat energy stored in the energy storage system, without the need to consume additional fuel, and without consuming power or electricity during the energy release stage, and can drive the turbine to do work.

[0074] The gas storage device includes a gas storage tank inlet valve 25, a gas storage cooler 26, a gas storage tank 27, and a gas storage tank outlet valve 28 that are connected in sequence along the gas flow direction. The gas storage tank 27 is used to store gaseous carbon dioxide in a normal pressure or pressurized state. The gas storage tank 27 includes, but is not limited to, a membrane-type flexible gas storage tank, a steel structure flexible film composite gas holder, and an underground gas storage tank, and is one or several of them. Among them, the gas storage volumes of the membrane-type flexible gas storage tank and the steel structure flexible film composite gas holder can be changed, and are used to store gaseous carbon dioxide at normal temperature and normal pressure. The underground gas storage tank is used to store gaseous carbon dioxide in a pressurized state. The gas storage tank is at least one. Note here that the number and structural form of the gas storage tank are determined by the gas storage volume, local geological conditions, and environmental factors. The destructive force of a flexible gas storage tank in a typhoon-prone area is huge, and using an underground gas storage tank can avoid the damage caused by typhoons. Moreover, the underground gas storage tank is also suitable for storing gaseous carbon dioxide in a pressurized state, recovering the pressure energy of the exhausted gas after the turbine does work, and reducing the energy consumption of the downstream compressor. Among them, the membrane-type flexible gas storage tank is an ultra-large-sized flexible gas storage tank with a very large storage capacity. The volume of a single gas storage tank is generally 100,000 m 3Levels of 10,000 m³ and 1 million m³, with the maximum single - body volume reaching over 10 million m³, can greatly increase the atmospheric - state storage volume of the pressure - storing working medium, thereby providing a carbon dioxide long - term pressure - storing system with greater power. The combined use of multiple single - body gas storage reservoirs can support the construction of an ultra - large - power long - term energy storage system for power stations above the GW level. Therefore, a larger - scale power generation and energy storage coupling system can be built, with higher comprehensive utilization value, suitable for large - scale thermal energy development, especially for large - scale solar thermal resources and dry - hot rock geothermal energy development.

[0075] The gas storage cooler 26 is used to cool the carbon dioxide working medium entering the gas storage reservoir 27 again, so that the pressure and temperature of the gaseous carbon dioxide flowing into it meet the storage requirements of the gas storage reservoir 27; the hot - side inlet of the gas storage cooler 26 is connected to the hot - side outlet of the cooler 4 through the gas storage reservoir inlet valve 25; the outlet of the gas storage reservoir 27 is connected to the inlet of the compressor 1 through the gas storage reservoir outlet valve 28.

[0076] The heat source unit 2 is used to provide heat and exchange heat with the circulating working medium of the power generation subsystem. The heat exchange form is that the circulating working medium exchanges heat with the heat source through the heat exchange surface or directly contacts the heat - containing substances in the heat source, so that the heat source unit 2 can couple different types and grades of heat sources for heat collection, making full use of environmentally friendly and renewable heat energy resources such as solar thermal energy and dry - hot rock.

[0077] A supplementary heat - flow bypass 29 is arranged between the outlet of the heat source unit 2 and the cold - side inlet of the high - temperature heat storage device 13. A supplementary heat - bypass valve 30 is provided on the pipeline of the supplementary heat - flow bypass 29. A main - circuit valve 11 is provided on the main - circuit pipeline between the outlet of the heat source unit 2 and the cold - side outlet of the high - temperature heat storage device 13. According to the above - described structure, the supplementary heat - flow bypass 29 can ensure supplementary heating when the heat of the heat source is insufficient, enhance the reliability of the power generation system, and ensure the normal external power supply of the system.

[0078] The power generation subsystem is a supercritical carbon dioxide Brayton cycle power generation system, and its circulating working medium is carbon dioxide. The supercritical carbon dioxide power cycle has the advantages of high energy density, compact system structure, and high cycle efficiency.

[0079] The compressor 1 is at least one group, and each group of compressors 1 includes a single - stage or multi - stage compressor. Inter - stage cooling is used for multi - stage compression, which can increase the pressure of the carbon dioxide circulating working medium and reduce the power consumption of the compressor; a buffer tank 31 is arranged upstream of the compressor 1, which can protect the compressor unit from surging during startup, shutdown, or emergencies. In addition, when the gas storage device fails or is under maintenance, it can provide a low - pressure pressure - storing medium for the pressure - storing device during energy storage, further ensuring the reliability and safety during the use of the system.

[0080] When using the above system, under normal circumstances, the main circuit valve 11 and the main circuit leveling regulating valve 9 are opened, and the auxiliary circuit leveling regulating valve 10, the energy storage shunt regulating valve 12, the gas storage inlet valve 25, the gas storage outlet valve 28, the pressure storage inlet valve 22, and the pressure storage outlet valve 24 are closed to carry out the main circuit power generation cycle. The energy storage subsystem is in a closed state. The carbon dioxide working fluid in the cycle flows into the compressor 1 and is compressed to a preset pressure. After compression, it flows into the heat source unit 2 for heating, and after heating, it forms a high-temperature and high-pressure supercritical carbon dioxide working fluid. The high-temperature and high-pressure supercritical carbon dioxide working fluid flows into the main circuit leveling 3 to expand and do work, driving the main circuit generator 7 to rotate and generate electricity. After the carbon dioxide working fluid completes the work, the carbon dioxide waste gas flowing out of the main circuit leveling 3 enters the cooler 4 for cooling, and after cooling, it flows into the compressor 1 through the buffer tank 31 to carry out the main circuit power generation cycle again.

[0081] When operating at reduced load, the working fluid flow rate and pressure of the compressor 1 and the heat source unit 2 remain unchanged. The energy storage shunt regulating valve 12 and the pressure storage inlet valve 22 are opened, and the energy storage shunt regulating valve 12 and the pressure storage inlet valve 22 are gradually opened wider, or the valve opening of the main circuit leveling regulating valve 9 is gradually closed smaller at the same time, so that the main circuit carbon dioxide working fluid passing through the main circuit leveling 3 gradually reduces its operation. The excess carbon dioxide working fluid sequentially passes through the energy storage shunt regulating valve 12, the high-temperature heat storage device 13, and the low-temperature heat storage device and flows into the pressure storage device for storage; when the carbon dioxide working fluid flow rate passing through the main circuit leveling 3 drops to the load requirement, the gas storage outlet valve 28 is opened, and the valve openings of the energy storage shunt regulating valve 12, the gas storage outlet valve 28, and the pressure storage inlet valve 22 are continuously and gradually opened wider. The gaseous carbon dioxide working fluid stored in the gas storage 27 gradually increases its flow rate output to ensure that the working fluid flow rate passing through the compressor 1 and the heat source unit 2 remains unchanged after the main circuit circulating working fluid reduces its operation; the gaseous carbon dioxide working fluid flowing out of the gas storage 27 and the carbon dioxide working fluid in the main circuit power generation cycle are merged through a pipeline and then flow into the compressor 1. The carbon dioxide working fluid is compressed to a preset pressure by the compressor 1 and then flows into the heat source unit 2 for heating. After heating, the carbon dioxide working fluid is divided into two paths. One path of the carbon dioxide working fluid has its flow rate reduced and then flows into the main circuit leveling 3 to expand and do work, driving the main circuit generator 7 to generate electricity, thereby reducing the power generation of the main circuit generator 7 and reducing the load. After doing work, the carbon dioxide waste gas enters the compressor 1 through the cooler 4 and the buffer tank 31 for the next main circuit cycle; the other path of the carbon dioxide working fluid sequentially flows through the energy storage shunt regulating valve 12 into the high-temperature heat storage device 13, the low-temperature heat storage device, and the pressure storage device, and stores the excess heat in the high-temperature heat storage device 13 and the low-temperature heat storage device through heat exchange in sequence, and stores the excess electrical energy in the pressure storage device in the form of pressure energy.

[0082] The adjustment target is: under the condition of keeping the working fluid flow rate passing through the compressor 1 and the heat source unit 2 unchanged, reducing the output of the main circuit leveling 3 to reduce the load, and effectively storing the excess heat and excess electrical energy at the same time.

[0083] When operating at an increased load, the working fluid flow rate and pressure of the compressor 1 and the heat source unit 2 remain unchanged. Gradually close the valve openings of the energy storage shunt regulating valve 12 and the pressure storage inlet valve 22, or gradually open the valve opening of the main path leveling regulating valve 9 at the same time. As a result, the carbon dioxide working fluid flow rate flowing into the main path leveling 3 gradually increases. When the carbon dioxide working fluid flow rate flowing into the main path leveling 3 increases to the load requirement, close the valve opening of the gas storage tank outlet valve 28. The carbon dioxide working fluid flow rate flowing out of the gas storage tank 27 decreases to ensure that the working fluid flow rate passing through the compressor 1 and the heat source unit 2 remains unchanged after the main circuit circulating working fluid increases. After the carbon dioxide working fluid flow rate flowing into the main path leveling 3 increases, the expansion work is increased, thereby increasing the power generation of the main path generator 7 and increasing the load.

[0084] The adjustment target is: under the condition of keeping the working fluid flow rate passing through the compressor 1 and the heat source unit 2 unchanged, reduce the working fluid flow rate flowing into the energy storage subsystem, increase the working fluid flow rate flowing into the main path leveling 3, and further increase the expansion work of the main path leveling 3 to increase the load.

[0085] During the peak electricity consumption period, the main circuit power generation cycle operates at full load. Close the gas storage tank outlet valve 28 and the pressure storage inlet valve 22, and open the auxiliary path leveling regulating valve 10, the pressure storage outlet valve 24, and the gas storage tank inlet valve 25. The supercritical carbon dioxide working fluid stored in the pressure storage device flows out of the supercritical carbon dioxide storage tank 23, successively flows into the low-temperature heat storage device and the high-temperature heat storage device 13 to absorb heat and increase the temperature to generate high-temperature and high-pressure supercritical carbon dioxide. The high-temperature and high-pressure supercritical carbon dioxide working fluid after temperature increase flows into the auxiliary path leveling 5 to expand and do work, and drives the auxiliary path generator 8 to generate electricity. After pressure release and work done, the carbon dioxide waste gas output from the auxiliary path leveling 5 is mixed with the carbon dioxide waste gas output from the main path leveling 3 and then enters the cooler 4 for cooling. The cooled carbon dioxide waste gas is divided into two paths. One path of the carbon dioxide waste gas enters the compressor unit for another main circuit power generation cycle, and the other path of the carbon dioxide waste gas flows into the gas storage cooler 26 for further cooling. After further cooling, the carbon dioxide waste gas flows into the gas storage tank 27 for storage.

[0086] The adjustment target is: the working fluid flow rate in the main circuit power generation cycle operates at full load, gradually increase the working fluid flow rate flowing into the auxiliary path leveling 5, and further increase the power generation of the auxiliary path generator 8 to meet the electricity demand during the peak electricity consumption period.

[0087] When the heat source unit 2 has sufficient and excessive heat, the main circuit circulation maintains normal operation. The pressure storage outlet valve 24 and the gas storage inlet valve 25 are closed, and the valve ports of the energy storage shunt regulating valve 12, the gas storage outlet valve 28, and the pressure storage inlet valve 22 are opened and gradually enlarged. The gaseous carbon dioxide flowing out of the gas storage 27 and the carbon dioxide circulation working medium of the main circuit flow into the compressor 1 after being combined through a pipeline, and the rotational speed of the rotating components of the compressor 1 is increased to increase the flow rate of the carbon dioxide working medium in the compressor 1 to ensure that the carbon dioxide circulation flow rate of the main circuit remains unchanged. The carbon dioxide working medium is compressed to a preset pressure by the compressor 1, and after compression, it flows into the heat source unit 2 for heating. After heating, the carbon dioxide working medium is divided into two paths. One path of the carbon dioxide working medium flows into the main circuit turbine 3 to expand and do work, driving the main circuit generator 7 to generate electricity. After doing work, the carbon dioxide working medium flows into the cooler 4 for cooling, and after cooling, the carbon dioxide working medium enters the compressor 1 for the next main circuit power generation cycle. The other path of the carbon dioxide working medium sequentially flows into the high-temperature heat storage device 13, the low-temperature heat storage device, and the pressure storage device through the energy storage shunt regulating valve 12, storing the excess heat in the high-temperature heat storage device 13 and the low-temperature heat storage device respectively, and storing the excess electric energy in the form of pressure energy in the pressure storage device.

[0088] The adjustment target is: to maintain a normal main circuit power generation cycle, gradually increase the flow rate of the working medium flowing into the energy storage subsystem, and store the excess heat in the form of thermal energy and pressure energy in the energy storage subsystem.

[0089] When the heat supply of the heat source unit 2 is insufficient, the main circuit valve 11, the gas storage inlet valve 25, the gas storage outlet valve 28, the pressure storage inlet valve 22, and the pressure storage outlet valve 24 are closed, and the heat supplement bypass valve 30 is opened. The carbon dioxide working medium in the circulation is heated by the heat source unit 2, and after heating, it flows into the high-temperature heat storage device 13 through the heat supplement circulation bypass 29 to further absorb heat and increase the temperature of the working medium, and then flows into the main circuit turbine 3 or / and the auxiliary circuit turbine 5 to expand and do work, respectively driving the main circuit generator 7 or / and the auxiliary circuit generator 8 to generate electricity. After doing work, the exhausted carbon dioxide gas is cooled by the cooler 4 and then enters the compressor 1 for compression. After compression, the carbon dioxide working medium enters the heat source unit 2 for reheating, and after reheating, it undergoes the next cycle.

[0090] The adjustment target is: to supplement heating through the high-temperature heat storage device 13 to enable the power generation system to work normally.

[0091] When there is no heat supply from the heat source unit 2 or when the compressor 1 fails, the compressor 1 stops working, the main circuit valve 11, the gas storage tank outlet valve 28, and the pressure storage inlet valve 22 are closed, the pressure storage outlet valve 24 and the gas storage tank inlet valve 25 are opened, and the high-pressure supercritical carbon dioxide working medium stored in the supercritical carbon dioxide storage tank 23 flows into the low-temperature heat storage device and the high-temperature heat storage device 13 in sequence to absorb heat and generate high-temperature and high-pressure supercritical carbon dioxide. The high-temperature and high-pressure supercritical carbon dioxide working medium after heat absorption flows into the main road flattener 3 or the auxiliary road flattener 5 to expand and do work, and drives the main road generator 7 or the auxiliary road generator 8 to generate electricity respectively. The carbon dioxide exhaust gas flowing out of the main road flattener 3 or the auxiliary road flattener 5 after doing work flows into the cooler 4 for cooling. After cooling, the carbon dioxide exhaust gas flows into the gas storage cooler 26 for further cooling. After further cooling, the carbon dioxide gas flows into the gas storage tank 27 for storage.

[0092] The adjustment target is: through the energy storage subsystem, energy is released to drive the main road flattener 3 or the auxiliary road flattener 5 to expand and do work, so that the power generation system works normally.

[0093] In another use embodiment, during energy storage, the gaseous carbon dioxide stored in the gas storage tank 27 flows into the compressor 1 through the gas storage tank outlet valve 28, is compressed to a preset pressure by the compressor 1 to generate high-pressure supercritical carbon dioxide, and the compressed carbon dioxide working medium flows into the heat source unit 2 for heating. After heating and temperature rise, high-temperature and high-pressure supercritical carbon dioxide is generated. The high-temperature and high-pressure supercritical carbon dioxide flows into the hot side of the high-temperature heat storage device 13 through the energy storage shunt regulating valve 12 for heat exchange. Part of the heat carried by the high-temperature and high-pressure supercritical carbon dioxide is transferred to the high-temperature heat storage device 13 for storage, completing high-temperature heat storage; after completing high-temperature heat storage, the carbon dioxide working medium flows into the low-temperature heat storage device, exchanges heat with the low-temperature heat storage medium in the low-temperature heat exchanger 14. At the same time, the low-temperature heat storage medium is pumped out from the low-temperature cold tank 19 through the low-temperature cold tank outlet valve 20 and the low-temperature cold tank medium pump 21, absorbs heat through the low-temperature heat exchanger 14, and flows into the low-temperature hot tank 16 for storage after heat absorption. Thus, the waste heat carried by the high-temperature and high-pressure supercritical carbon dioxide is transferred to the low-temperature heat storage device for storage, completing low-temperature heat storage; after completing low-temperature heat storage, the carbon dioxide working medium flows into the supercritical carbon dioxide storage tank 23 for storage and pressure storage.

[0094] During energy release, the low-temperature heat storage medium is pumped out of the low-temperature heat storage tank 16 through the low-temperature heat storage tank outlet valve 17 and the low-temperature heat storage tank medium pump 18, releases heat and cools down through the low-temperature heater 15, and then flows into the low-temperature cold storage tank 19 for storage; at the same time, the high-pressure supercritical carbon dioxide stored in the supercritical carbon dioxide storage tank 23 absorbs the heat carried by the low-temperature heat storage medium pumped out of the low-temperature heat storage tank 16 through heat exchange in the low-temperature heater 15, so that the heat stored in the low-temperature heat storage tank 16 is transferred to the supercritical carbon dioxide working medium again; the carbon dioxide working medium after heat exchange and temperature rise flows into the cold side of the high-temperature heat storage device 13 to continue absorbing heat, so that the heat stored in the high-temperature heat storage device 13 is transferred to the supercritical carbon dioxide working medium again; after further heat absorption, the carbon dioxide working medium generates high-temperature and high-pressure supercritical carbon dioxide, and the high-temperature and high-pressure supercritical carbon dioxide working medium flows into the main road turbine 3 or the auxiliary road turbine 5 to expand and do work, and drives the main road generator 7 or the auxiliary road generator 8 to generate electricity respectively; after doing work, the exhausted carbon dioxide output by the main road turbine 3 or the auxiliary road turbine 5 flows into the cooler 4 for cooling, and the cooled exhausted carbon dioxide then flows into the gas storage cooler 26 for secondary cooling, and the gaseous carbon dioxide after secondary cooling flows into the gas storage reservoir 27 for storage.

[0095] The power generation system provided by the embodiment of the present invention has strong multi-link coupling and strong scalability. Among them, the heat source unit can couple heat sources of different grades for heat collection, the heat storage device can also couple heat energy in different ways outside the system for heat storage, and the pressure storage cycle can also couple the waste electricity and surplus electricity generated by any power generation technology outside the system for electricity storage.

[0096] The so-called processor may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The processor is the control center of the device and connects all parts of the device through various interfaces and lines.

[0097] The memory can be used to store the computer programs and / or modules. By running or executing the computer programs and / or modules stored in the memory and invoking the data stored in the memory, the processor realizes various functions of the device. The memory mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created according to the use of the mobile phone (such as audio data, phone book, etc.). In addition, the memory can include high-speed random access memory and can also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a FlashCard, at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0098] The embodiment of the present invention describes a supercritical carbon dioxide power generation system. By determining actual situations such as the power generation working mode and the change of the power generation scenario through the operation parameter group of the power generation and energy storage integrated system, the corresponding method is adaptively adopted for power generation according to the power generation working mode and the change of the power generation scenario. The supercritical carbon dioxide power generation system improves the flexible adaptability of power storage and generation to actual demands; further, a supercritical carbon dioxide power generation system described in the embodiment of the present invention also stores the pressure energy of high-pressure supercritical carbon dioxide and classifies and stores the excess heat energy of the system, thereby further improving the economy and utilization efficiency of energy storage.

[0099] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A supercritical carbon dioxide power generation method, characterized in that The power generation method includes: Obtaining an operation parameter set of the integrated power generation and energy storage system, and determining a power generation working mode and a change situation of the power generation scenario according to the operation parameter set; the power generation working mode includes a working medium power generation mode and an energy storage power generation mode; the change situation of the power generation scenario is a decreasing load and an increasing load; the integrated power generation and energy storage system includes an energy storage module, a main power generation module, and a heat supply module, and the energy storage module is used for separately storing thermal energy and pressure energy; When the power generation working mode is the energy storage power generation mode, driving the main power generation module to generate power through the energy storage module; When the power generation working mode is the working medium power generation mode and the change situation of the power generation scenario is a decreasing load, reducing the flow rate of a first working medium flowing into the main power generation module according to a preset first working medium flow rate adjustment method, and performing working medium power generation and energy storage with supercritical carbon dioxide at the first working medium flow rate; When the power generation working mode is the working medium power generation mode and the change situation of the power generation scenario is an increasing load, adjusting the flow rate of a second working medium flowing into the energy storage module and the flow rate of a third working medium flowing into the heat supply module according to a preset second working medium flow rate adjustment method, and performing working medium power generation and energy storage with supercritical carbon dioxide at the second working medium flow rate and the third working medium flow rate; 2. The supercritical carbon dioxide power generation method according to claim 1, characterized in that The power generation method further includes: When the power generation working mode is the working medium power generation mode and the change situation of the power generation scenario is peak power consumption, operating the main power generation module in a full-load manner to generate power, and increasing the flow rate of a fourth working medium flowing into an auxiliary power generation module, so as to perform working medium power generation with supercritical carbon dioxide according to the fourth working medium flow rate; 3. The supercritical carbon dioxide power generation method according to claim 1, wherein The power generation method further includes: When the power generation working mode is the working medium power generation mode and the change situation of the power generation scenario is excessive heat supply, increasing the flow rate of a fifth working medium flowing into the energy storage module to perform energy storage; 4. The supercritical carbon dioxide power generation method according to claim 1, characterized in that The power generation method further includes: When the power generation working mode is the working medium power generation mode and the change situation of the power generation scenario is insufficient heat supply, supplementing and heating supercritical carbon dioxide through a high-temperature heat storage device in the energy storage module to perform working medium power generation with supercritical carbon dioxide; 5. The supercritical carbon dioxide power generation method according to claim 1, characterized in that, The power generation method further includes: When the power generation working mode is the working medium power generation mode and the change situation of the power generation scenario is a heat supply failure, releasing energy through the energy storage module to perform working medium power generation with supercritical carbon dioxide; 6. The supercritical carbon dioxide power generation method according to any one of claims 1 to 5, characterized in that, The energy storage module is further used for classifying and storing the thermal energy according to the temperature of the thermal energy; 7. A supercritical carbon dioxide power generation device, characterized in that, The power generation device includes a mode determination unit, an energy storage power generation unit, and a working medium power generation unit, wherein, The mode determination unit is used for obtaining an operation parameter set of the integrated power generation and energy storage system, and determining a power generation working mode and a change situation of the power generation scenario according to the operation parameter set; the power generation working mode includes a working medium power generation mode and an energy storage power generation mode; the change situation of the power generation scenario is a decreasing load and an increasing load; the integrated power generation and energy storage system includes an energy storage module, a main power generation module, and a heat supply module, and the energy storage module is used for separately storing thermal energy and pressure energy; The energy storage power generation unit is used to drive the main power generation module to generate power through the energy storage module when the power generation working mode is the energy storage power generation mode; The working medium power generation unit is used to reduce the flow rate of the first working medium flowing into the main power generation module according to a preset first working medium flow rate adjustment method and perform working medium power generation and energy storage through supercritical carbon dioxide with the first working medium flow rate when the power generation working mode is the working medium power generation mode and the change of the power generation scenario is a load reduction; when the power generation working mode is the working medium power generation mode and the change of the power generation scenario is a load increase, adjust the flow rate of the second working medium flowing into the energy storage module and the flow rate of the third working medium flowing into the heat supply module according to a preset second working medium flow rate adjustment method, and perform working medium power generation and energy storage through supercritical carbon dioxide with the second working medium flow rate and the third working medium flow rate; The power generation device further includes a gas storage reservoir, which is used to store gaseous carbon dioxide in a normal pressure or pressurized state. The number and structural form of the gas storage reservoir are determined by the gas storage volume, local geological conditions and environmental factors. The gas storage reservoir includes at least a membrane-type flexible gas storage reservoir, a steel structure flexible film composite gas holder and an underground gas storage reservoir; wherein, the gas storage volumes of the membrane-type flexible gas storage reservoir and the steel structure flexible film composite gas holder can be changed. The membrane-type flexible gas storage reservoir and the steel structure flexible film composite gas holder are used to store gaseous carbon dioxide at normal temperature and normal pressure, and the underground gas storage reservoir is used to store gaseous carbon dioxide in a pressurized state.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored computer program, wherein when the computer program runs, it controls the device where the computer-readable storage medium is located to execute the supercritical carbon dioxide power generation method according to any one of claims 1 to 6.

9. A supercritical carbon dioxide power generation system, characterized in that, The power generation system includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the supercritical carbon dioxide power generation method according to any one of claims 1 to 6.

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