Energy storage power generation system

Abstract

The present invention discloses an energy storage power generation system, which includes: a power grid, a primary energy storage power generation device, an LNG energy storage device, an ORC cycle power generation device, a secondary energy storage power generation device, and a transcritical CO2 cycle power generation device. The primary energy storage power generation device is connected to the power grid and the LNG energy storage device. The primary energy storage power generation device can burn natural gas to generate electricity and can also store the idle electric energy of the power grid. The ORC cycle power generation device is connected to the primary energy storage power generation device and the power grid. The ORC cycle power generation device uses thermal energy to generate electricity. The secondary energy storage power generation device is connected to the ORC cycle power generation device and the power grid. The secondary energy storage power generation device can generate electricity using the stored energy and can also store the idle electric energy of the power grid. The transcritical CO2 cycle power generation device is connected to the secondary energy storage power generation device. The transcritical CO2 cycle power generation device uses thermal energy to generate electricity. Thus, the effect of "peak shaving and valley filling" for the power grid can be achieved, the waste heat generated during the power generation process can be recovered, and the economic benefits of the system can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage and thermal systems, and particularly to an energy storage power generation system. Background Art

[0002] Current electric power production mainly comes from large power plants composed of large generators, and then through the unified national power grid, the centralized and single electric power is transmitted to each power consumption terminal in the form of high-voltage electricity. With the continuous increase in energy demand, the overall scale of the power transmission network is also constantly expanding, so the problems of power supply security and stability become more and more complex.

[0003] Since the power demand of electricity customers changes with time and seasons, there are increasingly serious peak-valley electricity problems in the large power supply network. In order to cope with the peak-valley electricity problems in the power supply network and meet the power demand of users during peak electricity consumption periods, the power system needs to invest a large amount of money every year in the capital construction for expanding the capacity of the power grid, but with little effect. Moreover, during the operation of the thermal system, a large amount of waste heat is generated. The common treatment method is to directly bring this part of heat into the environment by using cooling circulating water, which will cause a large amount of waste of thermal energy. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related technologies.

[0005] Therefore, an embodiment of the present invention provides a stable and energy-saving energy storage power generation system. The output power regulation of this system has the characteristics of fast speed and high precision. Moreover, the heat transfer temperature difference of this system is relatively low, thereby improving the total efficiency of the system.

[0006] The energy storage power generation system of the embodiment of the present invention includes: a power grid, a primary energy storage power generation device, an LNG energy storage device, an ORC cycle power generation device, a secondary energy storage power generation device, and a transcritical CO2 cycle power generation device. The primary energy storage power generation device is connected to the power grid. The LNG energy storage device is connected to the primary energy storage power generation device through a pipeline to supply natural gas to the primary energy storage power generation device. The primary energy storage power generation device can burn natural gas to generate electricity and supply electric energy to the power grid. The primary energy storage power generation device can also store the surplus electric energy of the power grid. The ORC cycle power generation device is connected to the primary energy storage power generation device and the power grid. The ORC cycle power generation device is used to generate electricity by using the heat energy generated by the primary energy storage power generation device and supply electric energy to the power grid. The secondary energy storage power generation device is connected to the ORC cycle power generation device to store energy by using the electric energy generated by the ORC cycle power generation device. The secondary energy storage power generation device is connected to the power grid. The secondary energy storage power generation device can generate electricity by using the stored energy and supply electric energy to the power grid. The secondary energy storage power generation device can also store the surplus electric energy of the power grid. The transcritical CO2 cycle power generation device is connected to the secondary energy storage power generation device. The transcritical CO2 cycle power generation device is used to generate electricity by using the heat energy generated by the secondary energy storage power generation device.

[0007] In the energy storage power generation system of the embodiment of the present invention, during the low electricity consumption period, the surplus electric energy of the power grid is stored through the primary energy storage power generation device and the secondary energy storage power generation device, so as to feedback and output for leveling during the high electricity consumption period, thereby achieving the effect of "peak shaving and valley filling" of the power grid. Moreover, the ORC cycle power generation device is used to recover the low-temperature waste heat generated during the power generation process of the primary energy storage power generation device, and the transcritical CO2 cycle power generation device is used to recover the low-temperature waste heat generated during the power generation process of the secondary energy storage power generation device, avoiding heat energy loss, thereby improving the economic benefits of the entire power supply system.

[0008] Therefore, the energy storage power generation system of the embodiment of the present invention solves the problems of peak-valley electricity and heat energy waste.

[0009] In some embodiments, the LNG energy storage device is connected to the transcritical CO2 cycle power generation device to supply low-temperature natural gas and condense the CO2 cycle working medium in the transcritical CO2 cycle power generation device. The transcritical CO2 cycle power generation device is connected to the ORC cycle power generation device to supply the condensed CO2 cycle working medium and condense the cycle working medium in the ORC cycle power generation device.

[0010] In some embodiments, the primary energy storage power generation device includes a primary compressor unit, a primary storage tank, a burner, a primary turbine, a first main generator, and a second main generator. The primary compressor unit is connected to the primary storage tank and the burner through pipelines. The primary storage tank is connected to the burner through a pipeline. The LNG energy storage device is connected to the burner through a pipeline. The burner is connected to the primary turbine through a pipeline. The primary turbine is connected to the first main generator. The second main generator is connected to the primary compressor unit and the primary turbine through a coupling. The first main generator and the second main generator are respectively connected to the power grid.

[0011] In some embodiments, the primary compressor unit includes a first main compressor, a second main compressor, a third main compressor, a first main intercooler, and a second main intercooler. The rotating shaft of the first main compressor is connected to the rotating shaft of the second main compressor. The exhaust port of the first main compressor is connected to the inlet of the second main compressor through a pipeline and the first main intercooler. The rotating shaft of the second main compressor is connected to the rotating shaft of the third main compressor. The exhaust port of the second main compressor is connected to the inlet of the third main compressor through a pipeline and the second main intercooler. The rotating shaft of the third main compressor is connected to the rotating shaft of the second main generator through a coupling. The third main compressor is connected to the burner and the primary storage tank through pipelines. The primary storage tank is connected to the burner through a pipeline and the second main intercooler. An outlet valve of the primary air compressor is provided on the pipeline between the third main compressor and the primary storage tank. An air valve is provided on the pipeline between the third main compressor and the burner. A primary air flow valve is provided on the pipeline between the primary storage tank and the burner.

[0012] In some embodiments, the ORC cycle power generation device includes an ORC turbine, an ORC condenser, an ORC circulation pump, and an ORC generator. The exhaust port of the ORC turbine is connected to the inlet of the circulating working fluid of the ORC condenser through a pipeline. The transcritical CO2 cycle power generation device is connected to the ORC condenser to condense the circulating working fluid in the ORC condenser. The outlet of the circulating working fluid of the ORC condenser is connected to the inlet of the ORC circulation pump through a pipeline. The outlet of the ORC circulation pump is connected to the inlet of the ORC turbine through a pipeline and the first main intercooler. The ORC turbine is connected to the ORC generator. The ORC generator is connected to the power grid.

[0013] In some embodiments, the secondary energy storage power generation device includes a secondary air compressor unit, a secondary storage tank, a secondary turbine, a first auxiliary generator, and a second auxiliary generator. The ORC generator is connected to the secondary air compressor unit through a coupling. The secondary air compressor unit is connected to the secondary storage tank through a pipeline. The secondary storage tank is connected to the secondary turbine through a pipeline. The secondary turbine is connected to the first auxiliary generator. The second auxiliary generator is connected to the secondary air compressor unit and the secondary turbine through a coupling. The first auxiliary generator and the second auxiliary generator are respectively connected to the power grid.

[0014] In some embodiments, the secondary air compressor unit includes a first auxiliary air compressor, a second auxiliary air compressor, a third auxiliary air compressor, a first auxiliary intercooler, and a second auxiliary intercooler. The rotating shaft of the ORC generator is connected to the rotating shaft of the first auxiliary air compressor through a coupling. The rotating shaft of the first auxiliary air compressor is connected to the rotating shaft of the second auxiliary air compressor. The exhaust port of the first auxiliary air compressor is connected to the intake port of the second auxiliary air compressor through a pipeline and the first auxiliary intercooler. The rotating shaft of the second auxiliary air compressor is connected to the rotating shaft of the third auxiliary air compressor. The exhaust port of the second auxiliary air compressor is connected to the intake port of the third auxiliary air compressor through a pipeline and the second auxiliary intercooler. The rotating shaft of the third auxiliary air compressor is connected to the rotating shaft of the second auxiliary generator through a coupling. The exhaust port of the third auxiliary air compressor is connected to the secondary storage tank through a pipeline. The secondary storage tank is connected to the secondary turbine through a pipeline. A secondary air compressor outlet valve is provided on the pipeline between the third auxiliary air compressor and the secondary storage tank. A secondary air flow valve is provided on the pipeline between the secondary storage tank and the secondary turbine.

[0015] In some embodiments, the transcritical CO₂ cycle power generation device includes a CO₂ turbine, a CO₂ condenser, a CO₂ circulation pump, and a CO₂ generator. The exhaust port of the CO₂ turbine is connected to the circulation working fluid inlet of the CO₂ condenser through a pipeline. The LNG energy storage device is connected to the CO₂ condenser to condense the circulation working fluid in the CO₂ condenser. The circulation working fluid outlet of the CO₂ condenser is connected to the inlet of the CO₂ circulation pump through a pipeline. The outlet of the CO₂ circulation pump is connected to the cold source inlet of the ORC condenser through a pipeline. The cold source outlet of the ORC condenser is connected to the intake port of the CO₂ turbine through a pipeline and the second auxiliary intercooler. The CO₂ turbine is connected to the CO₂ generator.

[0016] In some embodiments, the LNG energy storage device includes an LNG storage tank, a user cold storage, and a forced-draft heater; the LNG storage tank is connected to the user cold storage through a pipeline, the user cold storage is connected to the cold source inlet of the CO2 condenser through a pipeline, the cold source outlet of the CO2 condenser is connected to the air inlet of the forced-draft heater through a pipeline and the first sub-intercooler, and the air outlet of the forced-draft heater is connected to the burner through a pipeline; an LNG outlet valve is provided on the pipeline between the LNG storage tank and the user cold storage, and an LNG regulating valve is provided on the pipeline between the user cold storage and the CO2 condenser.

[0017] In some embodiments, it further includes a steam cycle power generation device, the steam cycle power generation device includes a waste heat boiler, a steam turbine, a steam condenser, a circulating water pump, and a steam generator, the exhaust port of the first-stage turbine is connected to the waste heat boiler through a pipeline, the evaporation drum of the waste heat boiler is connected to the steam inlet of the steam turbine through a pipeline, the steam outlet of the steam turbine is connected to the circulating medium inlet of the steam condenser through a pipeline, the circulating medium outlet of the steam condenser is connected to the inlet of the circulating water pump through a pipeline, the outlet of the circulating water pump is connected to the evaporation drum of the waste heat boiler through a pipeline, the steam turbine is connected to the steam generator, and the steam generator is connected to the power grid. Brief Description of the Drawings

[0018] Figure 1 is a schematic diagram of the energy storage power generation system according to an embodiment of the present invention.

[0019] Figure 2 is a schematic diagram of the primary energy storage power generation device of the energy storage power generation system according to an embodiment of the present invention.

[0020] Figure 3 is a schematic diagram of the ORC cycle power generation device of the energy storage power generation system according to an embodiment of the present invention.

[0021] Figure 4 is a schematic diagram of the secondary energy storage power generation device of the energy storage power generation system according to an embodiment of the present invention.

[0022] Figure 5 is a schematic diagram of the transcritical CO2 cycle power generation device of the energy storage power generation system according to an embodiment of the present invention.

[0023] Figure 6 is a schematic diagram of the LNG energy storage device of the energy storage power generation system according to an embodiment of the present invention.

[0024] Figure 7 is a schematic diagram of the steam cycle power generation device of the energy storage power generation system according to an embodiment of the present invention.

[0025] Reference Signs:

[0026] Power grid 100,

[0027] Primary energy storage power generation device 1, primary air compressor unit 11, first main air compressor 111, second main air compressor 112, third main air compressor 113, first main intercooler 114, second main intercooler 115, primary storage tank 12, burner 13, primary turbine 14, first main generator 15, second main generator 16, first main coupling 161, second main coupling 162, primary air compressor outlet valve 17, air valve 18, primary air flow valve 19,

[0028] LNG energy storage device 2, LNG storage tank 21, user cold storage 22, forced air heater 23, LNG outlet valve 24, LNG regulating valve 25,

[0029] ORC cycle power generation device 3, ORC turbine 31, ORC condenser 32, ORC circulation pump 33, ORC generator 34, ORC coupling 341,

[0030] Secondary energy storage power generation device 4, secondary air compressor unit 41, first auxiliary air compressor 411, second auxiliary air compressor 412, third auxiliary air compressor 413, first auxiliary intercooler 414, second auxiliary intercooler 415, secondary storage tank 42, secondary turbine 43, first auxiliary generator 44, second auxiliary generator 45, first auxiliary coupling 451, second auxiliary coupling 451, secondary air compressor outlet valve 46, secondary air flow valve 47,

[0031] Transcritical CO2 cycle power generation device 5, CO2 turbine 51, CO2 condenser 52, CO2 circulation pump 53, CO2 generator 54,

[0032] Steam cycle power generation device 6, waste heat boiler 61, steam turbine 62, steam condenser 63, circulating water pump 64, steam generator 65. Detailed implementation manners

[0033] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0034] The energy storage power generation system of the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0035] As Figures 1 to 7As shown in the figure, the energy storage power generation system of the embodiment of the present invention includes: a power grid 100, a primary energy storage power generation device 1, an LNG energy storage device 2, an ORC cycle power generation device 3, a secondary energy storage power generation device 4, and a transcritical CO2 cycle power generation device 5. The primary energy storage power generation device 1 is connected to the power grid 100. The LNG energy storage device 2 is connected to the primary energy storage power generation device 1 through a pipeline to supply natural gas to the primary energy storage power generation device 1. The primary energy storage power generation device 1 can burn natural gas to generate electricity and supply the generated electric energy to the power grid 100. The primary energy storage power generation device 1 can also store the surplus electric energy of the power grid 100. The ORC cycle power generation device 3 is connected to the primary energy storage power generation device 1 and the power grid 100. The ORC cycle power generation device 3 is used to generate electricity by using the heat energy generated by the primary energy storage power generation device 1 and supply the generated electric energy to the power grid 100. The secondary energy storage power generation device 4 is connected to the ORC cycle power generation device 3 to store energy by using the electric energy generated by the ORC cycle power generation device 3. The secondary energy storage power generation device 4 is connected to the power grid 100. The secondary energy storage power generation device 4 can generate electricity by using the stored energy and supply the generated electric energy to the power grid 100. The secondary energy storage power generation device 4 can also store the surplus electric energy of the power grid 100. The transcritical CO2 cycle power generation device 5 is connected to the secondary energy storage power generation device 4. The transcritical CO2 cycle power generation device 5 is used to generate electricity by using the heat energy generated by the secondary energy storage power generation device 4.

[0036] Among them, the power grid 100 delivers electric power to each power consumption terminal. During the peak power consumption period, the primary energy storage power generation device 1 generates electricity by burning the natural gas supplied by the LNG energy storage device 2 and delivers the generated electric energy to the power grid 100. The ORC cycle power generation device 3 generates electricity by using the heat energy generated during the power generation process of the primary energy storage power generation device 1 and delivers the generated electric energy to the power grid 100. The secondary energy storage power generation device 4 generates electricity by using the stored energy and delivers the generated electric energy to the power grid 100.

[0037] During the low power consumption period, on the premise of meeting the basic power demand of the power grid 100, the primary energy storage power generation device 1 stores the surplus electric energy of the power grid 100. The ORC cycle power generation device 3 outputs a part of the generated electric energy to the power grid 100 to meet the basic power demand of the power grid 100, and the other part of the electric energy is used for the energy storage operation of the secondary energy storage power generation device 4. Moreover, the surplus electric energy of the power grid 100 is also stored through the secondary energy storage power generation device 4. At this time, the transcritical CO2 cycle power generation device 5 generates electricity by using the heat energy generated during the energy storage process of the secondary energy storage power generation device 4. The electric energy generated by the transcritical CO2 cycle power generation device 5 can be used as plant electricity or supply electric energy to the equipment of this system.

[0038] Optionally, as Figures 1 to 7As shown in the figure, the primary energy storage power generation device 1 is connected to the power grid 100 and the LNG energy storage device 2. During the peak electricity consumption period, the primary energy storage power generation device 1 generates electricity by burning the natural gas transported by the LNG energy storage device 2, and transmits the electric energy generated by the combustion power generation to the power grid 100. The energy stored in the primary energy storage power generation device 1 is also used for combustion power generation. During the low electricity consumption period, the primary energy storage power generation device 1 generates electricity by burning the natural gas transported by the LNG energy storage device 2. On the premise of meeting the basic power demand of the power grid 100, the power grid 100 transmits the surplus electric energy to the primary energy storage power generation device 1 for storage.

[0039] The ORC cycle power generation device 3 is connected to the primary energy storage power generation device 1 and the secondary energy storage power generation device 4. The ORC cycle power generation device 3 is used to generate electricity by using the heat energy generated during the power generation process of the primary energy storage power generation device 1. During the peak electricity consumption period, the ORC cycle power generation device 3 transmits the generated electric energy to the power grid 100. During the low electricity consumption period, the ORC cycle power generation device 3 transmits a part of the electric energy to the power grid 100, and the other part of the electric energy is used for the energy storage operation of the secondary energy storage power generation device 4. It can also be understood that the ORC cycle power generation device 3 transmits the electric energy to the power grid 100 to meet the basic power demand of the power grid 100, and then the power grid 100 transmits the surplus electric energy to the secondary energy storage power generation device 4 for storage.

[0040] The secondary energy storage power generation device 4 is connected to the power grid 100. During the low electricity consumption period, the secondary energy storage power generation device 4 performs energy storage operation to store the surplus electric energy of the power grid 100. During the peak electricity consumption period, the secondary energy storage power generation device 4 does not perform energy storage operation. The secondary energy storage power generation device 4 uses the stored energy to generate electricity and transmits the generated electric energy to the power grid 100.

[0041] The transcritical CO2 cycle power generation device 5 is connected to the secondary energy storage power generation device 4. During the low electricity consumption period, the transcritical CO2 cycle power generation device 5 generates electricity by using the heat energy generated during the energy storage operation of the secondary energy storage power generation device 4. This part of the electric energy is used as plant electricity or provides electric energy for the equipment of this system.

[0042] Therefore, in the energy storage power generation system of the embodiment of the present invention, during the low electricity consumption period, the surplus electric energy of the power grid 100 is stored through the primary energy storage power generation device 1 and the secondary energy storage power generation device 4, so as to feedback and output for leveling during the peak electricity consumption period, thereby achieving the effect of "peak shaving and valley filling" of the power grid 100. Moreover, the ORC cycle power generation device 3 is used to recover the low-temperature waste heat generated during the power generation process of the primary energy storage power generation device 1, and the transcritical CO2 cycle power generation device 5 is used to recover the low-temperature waste heat generated during the power generation process of the secondary energy storage power generation device 4, avoiding heat energy loss, thereby improving the economic benefits of the entire power supply system.

[0043] In some embodiments, such as Figures 1 to 7As shown, the LNG energy storage device 2 is connected to the transcritical CO2 power generation device 5 to transport low-temperature natural gas and condense the CO2 cycle working fluid in the transcritical CO2 power generation device 5. The transcritical CO2 power generation device 5 is connected to the ORC cycle power generation device 3 to transport the condensed CO2 cycle working fluid and condense the cycle working fluid in the ORC cycle power generation device 3.

[0044] It should be understood that natural gas is a clean power generation fuel for power generation devices. During the transportation of natural gas to power generation devices, it is usually cooled and pressurized to become liquid LNG, and then heated and depressurized when needed, which is a common form of natural gas transportation in distributed gas turbine systems. However, if there is no other device to recover the cold energy during the transportation process, the cold energy of LNG will be wasted, which is a huge loss for the entire system.

[0045] Therefore, the LNG energy storage device 2 is connected to the transcritical CO2 power generation device 5. Since the boiling point of CO2 is relatively low, LNG is used as the cold source of the transcritical CO2 power generation device 5 to achieve the transcritical thermodynamic cycle of CO2 in the low-temperature region, thereby recovering the cold energy of LNG.

[0046] Optionally, as Figures 1 to 7 shown, the LNG energy storage device 2 is connected to the transcritical CO2 power generation device 5. During the low electricity consumption period, when the transcritical CO2 power generation device 5 is operating, the LNG energy storage device 2 flows through the transcritical CO2 power generation device 5 during the process of transporting low-temperature natural gas to the primary energy storage power generation device 1, so as to condense the CO2 cycle working fluid in the transcritical CO2 power generation device 5. This not only realizes the transcritical thermodynamic cycle of CO2 in the low-temperature region, but also preliminarily heats the low-temperature natural gas, reduces the heat transfer temperature difference, and improves the total efficiency of the system.

[0047] The transcritical CO2 power generation device 5 is connected to the ORC cycle power generation device 3, so that the CO2 cycle working fluid after heat exchange with low-temperature natural gas is used as the cold source of the ORC cycle power generation device 3 to condense the cycle working fluid in the ORC cycle power generation device 3. Thus, the loss of the system is reduced.

[0048] In some embodiments, such as Figure 1 and Figure 2As shown in the figure, the primary energy storage power generation device 1 includes a primary compressor unit 11, a primary storage tank 12, a burner 13, a primary turbine 14, a first main generator 15, and a second main generator 16. The primary compressor unit 11 is connected to the primary storage tank 12 and the burner 13 through pipelines. The primary storage tank 12 is connected to the burner 13 through a pipeline. The LNG energy storage device 2 is connected to the burner 13 through a pipeline. The burner 13 is connected to the primary turbine 14 through a pipeline. The primary turbine 14 is connected to the first main generator 15. The second main generator 16 is connected to the primary compressor unit 11 and the primary turbine 14 through a coupling. The first main generator 15 and the second main generator 16 are respectively connected to the power grid 100.

[0049] It can be understood that, as Figure 1 and Figure 2 shown, for the convenience of description, the coupling between the second main generator 16 and the primary compressor unit 11 is named the first main coupling 161, and the coupling between the second main generator 16 and the primary turbine 14 is named the second main coupling 162.

[0050] Optionally, as Figure 1 and Figure 2 shown, the primary compressor unit 11, the primary storage tank 12, and the burner 13 are interconnected so that the primary compressor unit 11 can compress the outside air and deliver it to the primary storage tank 12 and the burner 13, and the primary storage tank 12 can deliver the compressed air stored in the primary storage tank 12 to the burner 13. The LNG energy storage device 2 is connected to the burner 13 so that the LNG energy storage device 2 delivers natural gas to the burner 13 for combustion. The burner 13 is connected to the primary turbine 14. The primary turbine 14 is connected to the first main generator 15. The primary turbine 14 is connected to the second main generator 16 through the second main coupling 162 so that the high-temperature and high-pressure flue gas generated after combustion in the burner 13 enters the primary turbine 14 to do work, driving the first main generator 15 and the second main generator 16 to generate electricity. The first main generator 15 and the second main generator 16 are respectively connected to the power grid 100 to deliver the electric energy generated by the two to the power grid 100. The second main generator 16 is connected to the primary compressor unit 11 through the first main coupling 161.

[0051] Furthermore, as Figure 1 and Figure 2As shown in the figure, the first-stage compressor unit 11 includes a first main compressor 111, a second main compressor 112, a third main compressor 113, a first main intercooler 114, and a second main intercooler 115. The rotating shaft of the first main compressor 111 is connected to the rotating shaft of the second main compressor 112. The exhaust port of the first main compressor 111 is connected to the intake port of the second main compressor 112 through a pipeline and the first main intercooler 114. The rotating shaft of the second main compressor 112 is connected to the rotating shaft of the third main compressor 113. The exhaust port of the second main compressor 112 is connected to the intake port of the third main compressor 113 through a pipeline and the second main intercooler 115. The rotating shaft of the third main compressor 113 is connected to the rotating shaft of the second main generator 16 through a coupling. The third main compressor 113 is connected to the burner 13 and the first-stage storage tank 12 through pipelines. The first-stage storage tank 12 is connected to the burner 13 through a pipeline and the second main intercooler 115. An outlet valve 17 of the first-stage air compressor is provided on the pipeline between the third main compressor 113 and the first-stage storage tank 12. An air valve 18 is provided on the pipeline between the third main compressor 113 and the burner 13. A first-stage air flow valve 19 is provided on the pipeline between the first-stage storage tank 12 and the burner 13.

[0052] Among them, as Figure 1 and Figure 2 shown in the figure, the exhaust port of the first main compressor 111 is connected to the intake port of the second main compressor 112 through a pipeline and the first main intercooler 114. In other words, the exhaust port of the first main compressor 111 is connected to the intake port of the first main intercooler 114 through a pipeline, and the exhaust port of the first main intercooler 114 is connected to the intake port of the second main compressor 112 through a pipeline. The exhaust port of the second main compressor 112 is connected to the intake port of the third main compressor 113 through a pipeline and the second main intercooler 115. In other words, the exhaust port of the second main compressor 112 is connected to the intake port of the second main intercooler 115 through a pipeline, and the exhaust port of the second main intercooler 115 is connected to the intake port of the third main compressor 113 through a pipeline. The first-stage storage tank 12 is connected to the burner 13 through a pipeline and the second main intercooler 115. In other words, the outlet of the first-stage storage tank 12 is connected to the heat exchange inlet of the second main intercooler 115 through a pipeline, and the heat exchange outlet of the second main intercooler 115 is connected to the burner 13 through a pipeline.

[0053] Therefore, during peak hours of electricity consumption, the first-stage air compressor outlet valve 17, the air valve 18, and the first-stage air flow valve 19 are all in the open state, and the compressed gas in the first-stage storage tank 12 is heated by the first-stage air flow valve 19 and the second main intercooler 115 and then enters the burner 13. The outside air is compressed in sequence by the first main compressor 111, the second main compressor 112, and the third main compressor 113, and then enters the burner 13 through the air valve 18. The LNG energy storage device 2 transports the natural gas through the cold air into the burner 13, where it is mixed with the compressed air and then burned. At this time, the first main coupling 161 and the second main coupling 162 are both in the closed state, and the high-temperature and high-pressure flue gas generated after combustion enters the first-stage turbine 14 to perform work, driving the first main generator 15 and the second main generator 16 to supply power to the power grid 100.

[0054] During periods of low electricity demand, the primary air flow valve 19 is closed, the primary air compressor outlet valve 17 is open, and the first main coupling 161 is closed. At this point, the second main generator 16, receiving electricity from the power grid 100, begins operation, driving the first, second, and third main compressors 111, 112, and 113, compressing ambient air and storing it in the primary storage tank 12. Furthermore, to maintain the basic power needs of the power grid 100, the air valve 18 remains partially open (i.e., not fully open), providing a basic oxygen supply to the burner 13 and enabling the first main generator 15 to generate electricity and deliver it to the power grid 100.

[0055] In some embodiments, as Figure 1 and Figure 3 As shown, the ORC cycle power generation device 3 includes an ORC turbine 31, an ORC condenser 32, an ORC circulation pump 33, and an ORC generator 34. The exhaust port of the ORC turbine 31 is connected to the circulating working medium inlet of the ORC condenser 32 via a pipeline. The transcritical CO2 cycle power generation device 5 is connected to the ORC condenser 32 to condense the circulating working medium in the ORC condenser 32. The circulating working medium outlet of the ORC condenser 32 is connected to the inlet of the ORC circulation pump 33 via a pipeline. The outlet of the ORC circulation pump 33 is connected to the air inlet of the ORC turbine 31 via a pipeline and the first main intercooler 114. The ORC turbine 31 is connected to the ORC generator 34, and the ORC generator 34 is connected to the power grid 100.

[0056] Among them, such as Figure 1 and Figure 3 As shown, the outlet of the ORC circulation pump 33 is connected to the air inlet of the ORC turbine 31 via a pipeline and the first main intercooler 114. In other words, the outlet of the ORC circulation pump 33 is connected to the heat exchange inlet of the first main intercooler 114 via a pipeline, and the heat exchange outlet of the first main intercooler 114 is connected to the air inlet of the ORC turbine 31 via a pipeline.

[0057] It can be understood that during the multi-stage compression of the air in the primary energy storage power generation device 1, a large amount of mechanical energy is converted into the internal energy of the air, and the air temperature rises. Therefore, the compressed air flowing through the first main intercooler 114 has a relatively high temperature. In order to make full use of this part of thermal energy, an ORC cycle power generation device 3 is coupled in the system. This cycle uses an organic working fluid. After being heated by the first main intercooler 114, the organic working fluid evaporates to generate steam, which enters the ORC turbine 31 to do work, driving the ORC generator 34 to generate electricity, and the generated electricity is transmitted to the power grid 100.

[0058] In some embodiments, such as Figure 1 and Figure 4 shown, the secondary energy storage power generation device 4 includes a secondary compressor unit 41, a secondary storage tank 42, a secondary turbine 43, a first auxiliary generator 44 and a second auxiliary generator 45. The ORC generator 34 is connected to the secondary compressor unit 41 through a coupling. The secondary compressor unit 41 is connected to the secondary storage tank 42 through a pipeline. The secondary storage tank 42 is connected to the secondary turbine 43 through a pipeline. The secondary turbine 43 is connected to the first auxiliary generator 44. The second auxiliary generator 45 is connected to the secondary compressor unit 41 and the secondary turbine 43 through a coupling. The first auxiliary generator 44 and the second auxiliary generator 45 are respectively connected to the power grid 100.

[0059] It can be understood that, as Figures 1 to 4 shown, for the convenience of description, the coupling between the ORC generator 34 and the secondary compressor unit 41 is named the ORC coupling 341, the coupling between the second auxiliary generator 45 and the secondary compressor unit 41 is named the first auxiliary coupling 451, and the coupling between the second auxiliary generator 45 and the secondary turbine 43 is named the second auxiliary coupling 452.

[0060] Optionally, as Figure 1 and Figure 4 shown, the secondary compressor unit 41 is connected to the secondary storage tank 42, so that the secondary compressor unit 41 compresses the outside air and stores it in the secondary storage tank 42. The secondary storage tank 42 is connected to the secondary turbine 43. The secondary turbine 43 is connected to the first auxiliary generator 44. The secondary turbine 43 is connected to the second auxiliary generator 45 through the second auxiliary coupling 452, so that the compressed air enters the secondary turbine 43 to do work, driving the first auxiliary generator 44 and the second auxiliary generator 45 to generate electricity. The first auxiliary generator 44 and the second auxiliary generator 45 are respectively connected to the power grid 100 to transmit the electricity generated by both to the power grid 100. The second auxiliary generator 45 is connected to the secondary compressor unit 41 through the first auxiliary coupling 451.

[0061] Furthermore, as Figure 1 and Figure 4As shown in the figure, the secondary compressor unit 41 includes a first auxiliary compressor 411, a second auxiliary compressor 412, a third auxiliary compressor 413, a first auxiliary intercooler 414 and a second auxiliary intercooler 415. The rotating shaft of the ORC generator 34 is connected to the rotating shaft of the first auxiliary compressor 411 through a coupling. The rotating shaft of the first auxiliary compressor 411 is connected to the rotating shaft of the second auxiliary compressor 412. The exhaust port of the first auxiliary compressor 411 is connected to the intake port of the second auxiliary compressor 412 through a pipeline and the first auxiliary intercooler 414. The rotating shaft of the second auxiliary compressor 412 is connected to the rotating shaft of the third auxiliary compressor 413. The exhaust port of the second auxiliary compressor 412 is connected to the intake port of the third auxiliary compressor 413 through a pipeline and the second auxiliary intercooler 415. The rotating shaft of the third auxiliary compressor 413 is connected to the rotating shaft of the second auxiliary generator 45 through a coupling. The exhaust port of the third auxiliary compressor 413 is connected to the secondary storage tank 42 through a pipeline. The secondary storage tank 42 is connected to the secondary turbine 43 through a pipeline. A secondary air compressor outlet valve 46 is provided on the pipeline between the third auxiliary compressor 413 and the secondary storage tank 42. A secondary air flow valve 47 is provided on the pipeline between the secondary storage tank 42 and the secondary turbine 43.

[0062] Among them, as Figure 1 and Figure 4 shown in the figure, the exhaust port of the first auxiliary compressor 411 is connected to the intake port of the second auxiliary compressor 412 through a pipeline and the first auxiliary intercooler 414. In other words, the exhaust port of the first auxiliary compressor 411 is connected to the intake port of the first auxiliary intercooler 414 through a pipeline, and the exhaust port of the first auxiliary intercooler 414 is connected to the intake port of the second auxiliary compressor 412 through a pipeline. The exhaust port of the second auxiliary compressor 412 is connected to the intake port of the third auxiliary compressor 413 through a pipeline and the second auxiliary intercooler 415. In other words, the exhaust port of the second auxiliary compressor 412 is connected to the intake port of the second auxiliary intercooler 415 through a pipeline, and the exhaust port of the second auxiliary intercooler 415 is connected to the intake port of the third auxiliary compressor 413 through a pipeline.

[0063] Therefore, during the peak and valley periods of electricity consumption, the circulating working fluid of the ORC cycle power generation device 3 absorbs heat and evaporates when passing through the first main intercooler 114, enters the ORC turbine 31 to do work, the turbine does work externally, the ORC coupling 341 closes, and the ORC generator 34 receives electric energy from the power grid 100 and does work on the first auxiliary compressor 411, the second auxiliary compressor 412 and the third auxiliary compressor 413. At the same time, the second auxiliary generator 45 also receives electric energy from the power grid 100, the first auxiliary coupling 451 closes, the second auxiliary coupling 452 disconnects, and the first auxiliary compressor 411, the second auxiliary compressor 412 and the third auxiliary compressor 413 are synchronized to operate to compress and do work on the external air. At this time, the secondary air compressor outlet valve 46 is opened, the secondary air flow valve 47 is closed, the air is compressed step by step by the multi-stage compressor, the compressed air enters the secondary storage tank 42 through the secondary air compressor outlet valve 46, and the secondary turbine 43 stops operating.

[0064] During the peak electricity consumption period, the ORC coupling 341 and the first secondary coupling 451 are disconnected, and the second secondary coupling 452 is closed. The secondary energy storage power generation device 4 does not perform air compression temporarily. In order to be able to deliver more electric work to the power grid 100, at this time, the outlet valve 46 of the secondary air compressor is closed, and the secondary air flow valve 47 is opened. The compressed air in the secondary storage tank 42 enters the secondary turbine 43 to do work, driving the first secondary generator 44 and the second secondary generator 45 to supply power to the power grid 100.

[0065] Therefore, the secondary energy storage power generation device 4 is an open Brayton cycle, which is used to regulate the system output or the power grid 100 fluctuations. The compressed air enters the secondary storage tank 42 after passing through the first secondary intercooler 414 and the second secondary intercooler 415. Through the combined opening and disconnection of the ORC coupling 341, the first secondary coupling 451 and the second secondary coupling 452, the secondary air flow valve 47 controls the flow rate entering the secondary turbine 43, achieving the dynamic consumption and replenishment of the energy of the entire system and the power grid 100, and maintaining the output stability of the entire system.

[0066] In some embodiments, as Figure 1 and Figure 5 shown, the transcritical CO2 cycle power generation device 5 includes a CO2 turbine 51, a CO2 condenser 52, a CO2 circulation pump 53 and a CO2 generator 54. The exhaust port of the CO2 turbine 51 is connected to the circulating working fluid inlet of the CO2 condenser 52 through a pipeline. The LNG energy storage device 2 is connected to the CO2 condenser 52 to condense the circulating working fluid in the CO2 condenser 52. The circulating working fluid outlet of the CO2 condenser 52 is connected to the inlet of the CO2 circulation pump 53 through a pipeline. The outlet of the CO2 circulation pump 53 is connected to the cold source inlet of the ORC condenser 32 through a pipeline. The cold source outlet of the ORC condenser 32 is connected to the inlet of the CO2 turbine 51 through a pipeline and the second secondary intercooler 415. The CO2 turbine 51 is connected to the CO2 generator 54.

[0067] Among them, as Figure 1 and Figure 5 shown, the cold source outlet of the ORC condenser 32 is connected to the inlet of the CO2 turbine 51 through a pipeline and the second secondary intercooler 415. In other words, the cold source outlet of the ORC condenser 32 is connected to the heat exchange inlet of the second secondary intercooler 415 through a pipeline, and the heat exchange outlet of the second secondary intercooler 415 is connected to the inlet of the CO2 turbine 51 through a pipeline.

[0068] It can be understood that since the compressed air flowing in the second auxiliary intercooler 415 has a relatively high temperature, it can be used to supply heat to the low-temperature end. During the low electricity consumption period, when the secondary energy storage power generation device 4 operates in energy storage mode, the transcritical CO2 cycle power generation device 5 is started. After being heated by the second auxiliary intercooler 415, the CO2 working medium enters the CO2 turbine 51 to do work, driving the CO2 generator 54 to generate electricity. The generated electricity can be used as plant electricity or supply electrical energy to the compressed air motor. After the CO2 is discharged from the exhaust port of the CO2 turbine 51, it enters the CO2 condenser 52 to exchange heat with the low-temperature natural gas transported by the LNG energy storage device 2, so as to condense the CO2 into a liquid state, and then enters the ORC condenser 32 through the CO2 circulation pump 53 to exchange heat with the circulating working medium of the ORC cycle power generation device 3, serving as the cold source of the ORC cycle power generation device 3. After being initially heated, it enters the second auxiliary intercooler 415 again to start the next cycle.

[0069] Therefore, in the energy storage power generation system of the embodiment of the present invention, by coupling the transcritical CO2 cycle power generation device 5, the cold energy of cryogenic LNG is used to condense the CO2 cycle, further reducing the heat transfer temperature difference and improving the efficiency of the system.

[0070] In some embodiments, as Figure 1 and Figure 6 shown, the LNG energy storage device 2 includes an LNG storage tank 21, a user cold storage 22, and a forced air heater 23. The LNG storage tank 21 is connected to the user cold storage 22 through a pipeline. The user cold storage 22 is connected to the cold source inlet of the CO2 condenser 52 through a pipeline. The cold source outlet of the CO2 condenser 52 is connected to the inlet of the forced air heater 23 through a pipeline and the first auxiliary intercooler 414. The outlet of the forced air heater 23 is connected to the burner 13 through a pipeline. An LNG outlet valve 24 is provided on the pipeline between the LNG storage tank 21 and the user cold storage 22, and an LNG regulating valve 25 is provided on the pipeline between the user cold storage 22 and the CO2 condenser 52.

[0071] Among them, as Figure 1 and Figure 6 shown, the cold source outlet of the CO2 condenser 52 is connected to the inlet of the forced air heater 23 through a pipeline and the first auxiliary intercooler 414. In other words, the cold source outlet of the CO2 condenser 52 is connected to the heat exchange inlet of the first auxiliary intercooler 414 through a pipeline, and the heat exchange outlet of the first auxiliary intercooler 414 is connected to the inlet of the forced air heater 23 through a pipeline.

[0072] It can be understood that during the peak electricity consumption period, the compressor of the secondary energy storage power generation device 4 is in a shutdown state, there is no high-temperature compressed air heating in the first auxiliary intercooler 414, and the transcritical CO2 cycle power generation device 5 does not operate. The LNG in the LNG storage tank 21 first enters the user cold storage 22, is initially heated and transformed into low-temperature natural gas before flowing out. Since it is not heated when flowing through the CO2 condenser 52 and the second auxiliary intercooler 415 and there is no high-temperature auxiliary heating unit, a forced-air heater 23 is required to raise its temperature to near the ambient temperature, and then it is transported to the burner 13 for mixing and combustion with compressed air.

[0073] During the low electricity consumption period, the LNG in the LNG storage tank 21 first enters the user cold storage 22, is initially heated and transformed into low-temperature natural gas, then sequentially passes through the CO2 condenser 52 and the second auxiliary intercooler 415 for heating, and then is transported to the burner 13. At this time, the forced-air heater 23 stops working.

[0074] Therefore, after flowing out of the LNG storage tank 21, the LNG first enters the user cold storage 22 through the LNG outlet valve 24. The user cold storage 22 is generally an industrial system such as chemical industry, which raises the temperature of the LNG to an appropriate temperature and transforms it into low-temperature natural gas. The low-temperature natural gas enters the CO2 condenser 52 through the LNG regulating valve 25 to condense the exhaust gas of the CO2 turbine 51. At this time, the CO2 temperature increases again, and after being heated for the third time by the first auxiliary intercooler 414, it enters the burner 13 to be mixed with compressed air for combustion. The generated high-temperature flue gas enters the first-stage turbine 14 to do work, thereby realizing the cascade utilization of the cold energy of the LNG and reducing the loss.

[0075] In some embodiments, as Figure 1 and Figure 7 shown, it further includes a steam cycle power generation device 6. The steam cycle power generation device 6 includes a waste heat boiler 61, a steam turbine 62, a steam condenser 63, a circulating water pump 64 and a steam generator 65. The exhaust port of the first-stage turbine 14 is connected to the waste heat boiler 61 through a pipeline. The evaporation drum of the waste heat boiler 61 is connected to the steam inlet of the steam turbine 62 through a pipeline. The steam outlet of the steam turbine 62 is connected to the circulating medium inlet of the steam condenser 63 through a pipeline. The circulating medium outlet of the steam condenser 63 is connected to the inlet of the circulating water pump 64 through a pipeline. The outlet of the circulating water pump 64 is connected to the evaporation drum of the waste heat boiler 61 through a pipeline. The steam turbine 62 is connected to the steam generator 65, and the steam generator 65 is connected to the power grid 100.

[0076] It can be understood that by setting the steam cycle power generation device 6 to utilize the heat energy in the high-temperature flue gas generated by the first-stage energy storage power generation device 1, the energy utilization efficiency is further improved.

[0077] Optionally, asFigure 1 and Figure 7 As shown in Figure 7 , the exhaust port of the first-stage turbine 14 is connected to the waste heat boiler 61 through a pipeline, so that the high-temperature flue gas discharged from the first-stage turbine 14 enters the waste heat boiler 61, heats the circulating water in the evaporation drum of the waste heat boiler 61 and converts it into circulating steam, while the low-temperature flue gas is discharged through the chimney of the waste heat boiler 61.

[0078] The evaporation drum of the waste heat boiler 61 is connected to the steam inlet of the steam turbine 62 through a pipeline. The steam turbine 62 is connected to the steam generator 65, and the steam generator 65 is connected to the power grid 100, so that the superheated steam enters the steam turbine 62, drives the steam generator 65 to do work and generate electricity, and transmits the generated electric energy to the power grid 100.

[0079] The steam outlet of the steam turbine 62 is connected to the circulating medium inlet of the steam condenser 63 through a pipeline, so that the exhausted steam discharged from the steam turbine 62 enters the steam condenser 63 for condensation, and the steam condenser 63 is externally connected to a cooling water source for condensation.

[0080] The circulating medium outlet of the steam condenser 63 is connected to the inlet of the circulating water pump 64 through a pipeline. The outlet of the circulating water pump 64 is connected to the evaporation drum of the waste heat boiler 61 through a pipeline. The condensed water enters the circulating water pump 64 for pressurization and is pumped into the evaporation drum of the waste heat boiler 61 to start the next cycle.

[0081] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0082] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plural" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0083] In the present invention, unless otherwise clearly specified or limited, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection, or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0085] In the present invention, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0086] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. An energy storage power generation system, characterized in that: include: Power grid; a primary energy storage and power generation device, the primary energy storage and power generation device being connected to the power grid; an LNG energy storage device, the LNG energy storage device being connected to the primary energy storage and power generation device via a pipeline to deliver natural gas to the primary energy storage and power generation device, the primary energy storage and power generation device being capable of burning natural gas to generate electricity and delivering electricity to the power grid, and the primary energy storage and power generation device being capable of storing surplus electricity from the power grid; An ORC cycle power generation device, the ORC cycle power generation device is connected to the primary energy storage power generation device and the power grid, the ORC cycle power generation device is used to generate electricity using the heat energy generated by the primary energy storage power generation device and transmit electrical energy to the power grid; a secondary energy storage power generation device, the secondary energy storage power generation device being connected to the ORC cycle power generation device to utilize the electric energy generated by the ORC cycle power generation device for energy storage, the secondary energy storage power generation device being connected to the power grid, the secondary energy storage power generation device being able to utilize the stored energy to generate electricity and transmit electric energy to the power grid, and the secondary energy storage power generation device being able to further store the idle electric energy of the power grid; A transcritical CO2 cycle power generation device, the transcritical CO2 cycle power generation device is connected to the secondary energy storage power generation device, and the transcritical CO2 cycle power generation device is used to generate electricity using the heat energy generated by the secondary energy storage power generation device; The first-stage energy storage power generation device includes a first-stage compressor unit, a first-stage storage tank, a burner, a first-stage turbine, a first main generator, and a second main generator. The first-stage compressor unit is connected to the first-stage storage tank and the burner via a pipeline, the first-stage storage tank is connected to the burner via a pipeline, the LNG energy storage device is connected to the burner via a pipeline, the burner is connected to the first-stage turbine via a pipeline, the first-stage turbine is connected to the first main generator, the second main generator is connected to the first-stage compressor unit and the first-stage turbine via a coupling, and the first main generator and the second main generator are respectively connected to the power grid; The ORC cycle power generation device includes an ORC turbine, an ORC condenser, an ORC circulation pump and an ORC generator; The secondary energy storage power generation device includes a secondary compressor unit, a secondary storage tank, a secondary turbine, a first auxiliary generator and a second auxiliary generator. The ORC generator is connected to the secondary compressor unit via a coupling, the secondary compressor unit is connected to the secondary storage tank via a pipeline, the secondary storage tank is connected to the secondary turbine via a pipeline, the secondary turbine is connected to the first auxiliary generator, the second auxiliary generator is connected to the secondary compressor unit and the secondary turbine via a coupling, and the first auxiliary generator and the second auxiliary generator are respectively connected to the power grid.

2. The energy storage and power generation system according to claim 1, characterized in that: The LNG energy storage device is connected to the transcritical CO2 cycle power generation device to transport low-temperature natural gas and condense the CO2 circulating working fluid in the transcritical CO2 cycle power generation device. The transcritical CO2 cycle power generation device is connected to the ORC cycle power generation device to transport the condensed CO2 circulating working fluid and condense the circulating working fluid in the ORC cycle power generation device.

3. The energy storage and power generation system according to claim 2, characterized in that: The first-stage compressor unit includes a first main compressor, a second main compressor, a third main compressor, a first main intercooler and a second main intercooler; The rotating shaft of the first main compressor is connected to the rotating shaft of the second main compressor, and the exhaust port of the first main compressor is connected to the air inlet of the second main compressor via a pipeline and the first main intercooler; The rotating shaft of the second main compressor is connected to the rotating shaft of the third main compressor, and the exhaust port of the second main compressor is connected to the air inlet of the third main compressor via a pipeline and the second main intercooler; The rotating shaft of the third main compressor is connected to the rotating shaft of the second main generator via a coupling, the third main compressor is connected to the burner and the first-stage storage tank via a pipeline, and the first-stage storage tank is connected to the burner via a pipeline and the second main intercooler; A first-level air compressor outlet valve is provided on the pipeline between the third main compressor and the first-level storage tank, an air valve is provided on the pipeline between the third main compressor and the burner, and a first-level air flow valve is provided on the pipeline between the first-level storage tank and the burner.

4. The energy storage and power generation system according to claim 3, characterized in that: The exhaust port of the ORC turbine is connected to the circulating working medium inlet of the ORC condenser via a pipeline. The transcritical CO2 cycle power generation device is connected to the ORC condenser to condense the circulating working medium in the ORC condenser. The circulating working medium outlet of the ORC condenser is connected to the inlet of the ORC circulating pump via a pipeline. The outlet of the ORC circulating pump is connected to the air inlet of the ORC turbine via a pipeline and the first main intercooler. The ORC turbine is connected to the ORC generator, and the ORC generator is connected to the power grid.

5. The energy storage and power generation system according to claim 4, characterized in that: The two-stage compressor unit includes a first auxiliary compressor, a second auxiliary compressor, a third auxiliary compressor, a first intercooler and a second intercooler; The rotating shaft of the ORC generator is connected to the rotating shaft of the first auxiliary compressor via a coupling, the rotating shaft of the first auxiliary compressor is connected to the rotating shaft of the second auxiliary compressor, and the exhaust port of the first auxiliary compressor is connected to the air inlet of the second auxiliary compressor via a pipeline and the first auxiliary intercooler; The rotating shaft of the second auxiliary compressor is connected to the rotating shaft of the third auxiliary compressor, and the exhaust port of the second auxiliary compressor is connected to the air inlet of the third auxiliary compressor via a pipeline and the second auxiliary intercooler; The rotating shaft of the third auxiliary compressor is connected to the rotating shaft of the second auxiliary generator via a coupling, the exhaust port of the third auxiliary compressor is connected to the secondary storage tank via a pipeline, and the secondary storage tank is connected to the secondary turbine via a pipeline; A secondary air compressor outlet valve is provided on the pipeline between the third auxiliary compressor and the secondary storage tank, and a secondary air flow valve is provided on the pipeline between the secondary storage tank and the secondary turbine.

6. The energy storage and power generation system according to claim 5, characterized in that: The transcritical CO2 cycle power generation device includes a CO2 turbine, a CO2 condenser, a CO2 circulation pump and a CO2 generator. The exhaust port of the CO2 turbine is connected to the circulating working fluid inlet of the CO2 condenser via a pipeline. The LNG energy storage device is connected to the CO2 condenser to condense the circulating working fluid in the CO2 condenser. The circulating working fluid outlet of the CO2 condenser is connected to the inlet of the CO2 circulation pump via a pipeline. The outlet of the CO2 circulation pump is connected to the cold source inlet of the ORC condenser via a pipeline. The cold source outlet of the ORC condenser is connected to the air inlet of the CO2 turbine via a pipeline and the second intercooler. The CO2 turbine is connected to the CO2 generator.

7. The energy storage and power generation system according to claim 6, characterized in that: The LNG energy storage device includes an LNG storage tank, a user cold storage and a blast heater; The LNG storage tank is connected to the user cold storage via a pipeline, the user cold storage is connected to the cold source inlet of the CO2 condenser via a pipeline, the cold source outlet of the CO2 condenser is connected to the air inlet of the blast heater via a pipeline and the first intercooler, and the air outlet of the blast heater is connected to the burner via a pipeline; An LNG outlet valve is provided on the pipeline between the LNG storage tank and the user cold storage, and an LNG regulating valve is provided on the pipeline between the user cold storage and the CO2 condenser.

8. The energy storage and power generation system according to any one of claims 1 to 7, characterized in that: It also includes a steam cycle power generation device, which includes a waste heat boiler, a steam turbine, a steam condenser, a circulating water pump and a steam generator. The exhaust port of the first-stage turbine is connected to the waste heat boiler via a pipeline, the evaporation drum of the waste heat boiler is connected to the steam inlet of the steam turbine via a pipeline, the steam outlet of the steam turbine is connected to the circulating medium inlet of the steam condenser via a pipeline, the circulating medium outlet of the steam condenser is connected to the inlet of the circulating water pump via a pipeline, the outlet of the circulating water pump is connected to the evaporation drum of the waste heat boiler via a pipeline, the steam turbine is connected to the steam generator, and the steam generator is connected to the power grid.

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