Thermoelectric unit and Carnot cell coupling system and operation method

Abstract

The invention relates to the technical field of peak regulation, in particular to a thermoelectric unit and Carnot cell coupling system and an operation method, and the thermoelectric unit and Carnot cell coupling system comprises a steam turbine power generation subsystem and a Carnot cell; the steam turbine power generation subsystem comprises a boiler, a steam turbine set, an air-cooled condenser and a regenerative steam extraction pipeline, the steam turbine set comprises a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder and a generator which are coaxially connected, and an exhaust pipeline of the low-pressure cylinder is communicated with a steam inlet of the condenser; the Carnot battery comprises a heat pump evaporator, a shell side inlet of the heat pump evaporator is connected into an exhaust pipeline of the low-pressure cylinder through a dead steam conveying pipeline, a first valve is arranged on the dead steam conveying pipeline, a shell side outlet of the heat pump evaporator is communicated with a first water inlet of the condensation water tank through a saturated water conveying pipeline, and a second valve is arranged on the saturated water conveying pipeline. The degree of participation of the Carnot battery in unit operation is low, the complexity of a coupling system is reduced, and the safety and reliability of operation are guaranteed; when the coupling system works, waste steam latent heat of the low-pressure cylinder can be recycled, and gradient utilization of energy is achieved.

Description

Technical Field

[0001] The present invention relates to the field of peak load regulation technology, and in particular to a thermal power unit and Carnot battery coupling system and an operation method. Background Art

[0002] In the future, the power system will develop into a new power system dominated by new energy. Renewable energy generation will become the main power source, and traditional thermal power will gradually transform from the main power generation to the regulating power source in the power system. In order to fully absorb the power generation of new energy, the peak-shaving task of thermal power units is becoming increasingly severe, and the power grid is facing huge peak-shaving pressure. Therefore, it is necessary to further tap the peak-shaving potential of thermal power units.

[0003] In order to improve the peak-shaving capacity of thermal power units, that is, to improve the flexibility of the units, flexibility transformation is needed. The essence of the transformation is to reduce the thermal-electric coupling. The current thermal-electric decoupling technologies mainly include high and low bypass steam extraction of steam turbines, zero output of low-pressure cylinders, thermal storage coupling peak-shaving, thermal energy storage (additional thermal storage system, electric boiler thermal storage), high back-pressure circulating water heating, etc. The problems with the above-mentioned thermal-electric decoupling technology are as follows: the thermal economy of high and low bypass steam extraction of the turbine is poor and the cost is high; the zero output of the low-pressure cylinder has an adverse effect on the life of the low-pressure cylinder rotor of the turbine (a key component that is technology-intensive and capital-intensive), and there are safety risks in the operation of the unit; thermal storage coupling peak regulation and thermal energy storage (installing a thermal storage system, electric boiler thermal storage) currently mainly use the unit's steam extraction or power generation to store thermal energy, and then release the heat when needed in the future. In essence, it is the storage of thermal energy across a short time scale, in which the heat generated by the electric boiler is one part of electricity for one part of heat, and its performance is lower than that of the heat pump; the high back pressure circulating water heating method can ensure the heating load requirements and reduce the power generation at the same time, but the thermal economy of the unit becomes poor and the cost is high. At the same time, after the unit completes the thermal-electric decoupling transformation, its heat utilization still has problems of inefficiency and insufficiency, such as the low quality and large amount of steam exhaust energy of the turbine, which accounts for about 60% of the overall loss of coal-fired power plants and has not been effectively utilized.

[0004] The Chinese invention patent with publication number CN116207784A provides a system for coupling coal-fired power generation and Carnot battery energy storage and its operation method, the system includes a coal-fired power generation coupling storage tank system, a Carnot battery energy storage system, and a Carnot battery energy release system; when the power consumption is low, the coal-fired power generation unit maintains the existing load unchanged, and inputs the excess electric energy into the Carnot battery energy storage system through the electric motor, and finally converts the electric energy into the heat energy of the heat storage medium and stores it in different storage tanks; when the power consumption is peak, the boiler heat load remains unchanged, the bypass feed water, the newly added feed water and the condensate are heated by the heat of the storage tank to improve the output of the unit, and at the same time, the Carnot battery energy release system also uses the heat of the storage tank to generate part of the electric energy, and finally the combined system meets the power load demand; the Chinese invention patent with publication number CN118327722A provides a system for coupling coal-fired power generation and Carnot battery energy storage system with exhaust steam as heat. A Carnot battery coal-fired unit with a heat source and an operation method thereof, the system includes a steam turbine power generation system, a heat storage system and a heat release system; according to the change of the mass flow rate of the circulating working fluid in the heat storage system, the exhaust gas is flexibly used for preheating through a steam ejector, and the existing technology can partially or completely recover the waste heat generated by the steam turbine power generation system; in addition, compared with the traditional Carnot battery system that uses methanol as the heat source of the cold source heater, the power generation of the auxiliary steam turbine can be increased, thereby improving the COP of the electric heat conversion system; in the technical solutions provided by the above two existing technologies, since the Carnot battery is deeply involved in the work flow of the unit, it has a strong coupling with the unit and needs to be operated in conjunction, it is not easy to switch to a single-machine operation mode, resulting in a decrease in the safety and reliability of the entire system; in addition, the Carnot battery is connected to a large number of unit equipment, resulting in a complex system structure and high cost.

[0005] Based on this, how to improve the safety and reliability of the thermal power unit and Carnot battery coupling system and reduce the system cost is a technical problem that needs to be solved urgently. Summary of the invention

[0006] The object of the present invention is to provide a thermoelectric generator set and Carnot battery coupling system and an operation method thereof, so as to improve the safety and reliability of the thermoelectric generator set and Carnot battery coupling system and reduce the system cost.

[0007] The present invention is implemented by the following technical solutions: a thermal power unit and Carnot battery coupling system, the coupling system comprising a steam turbine generator subsystem and a Carnot battery;

[0008] Wherein, the steam turbine generating subsystem includes a boiler, a steam turbine unit, an air-cooled condenser and a heat recovery steam extraction pipeline. The steam turbine unit includes a coaxially connected high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder and a first generator. The steam inlet of the high-pressure cylinder is connected to the steam outlet of the boiler, the exhaust pipe of the low-pressure cylinder is connected to the steam inlet of the air-cooled condenser, the drain outlet of the condensate tank of the air-cooled condenser is connected to the water inlet of the heat recovery steam extraction pipeline through a condensate delivery pipeline, a condensate pump is provided on the condensate delivery pipeline, and the drain outlet of the heat recovery steam extraction pipeline is connected to the water inlet of the boiler;

[0009] The Carnot battery includes a heat pump evaporator, a shell side inlet of the heat pump evaporator is connected to the exhaust pipe of the low-pressure cylinder through an exhaust steam delivery pipeline, a first valve is provided on the exhaust steam delivery pipeline, and the low-temperature exhaust steam discharged from the low-pressure cylinder enters the heat pump evaporator through the first valve and is used as a heat source for heat exchange, and the shell side outlet of the heat pump evaporator is connected to the first water inlet of the condensate tank through a saturated water delivery pipeline, and a second valve is provided on the saturated water delivery pipeline.

[0010] According to a preferred embodiment, the exhaust port of the high-pressure cylinder is connected to the reheat steam inlet of the boiler, the reheat steam exhaust port of the boiler is connected to the steam inlet of the intermediate-pressure cylinder, and the exhaust port of the intermediate-pressure cylinder is connected to the steam inlet of the low-pressure cylinder.

[0011] According to a preferred embodiment, the heat recovery extraction steam pipeline includes a first low-pressure heater, a second low-pressure heater, a third low-pressure heater, a deaerator, a first high-pressure heater, a second high-pressure heater and a third high-pressure heater;

[0012] The drain outlet of the condensate tank is connected to the tube-side inlet of the first low-pressure heater through a condensate delivery pipeline, the tube-side outlet of the first low-pressure heater is connected to the tube-side inlet of the second low-pressure heater, the shell-side inlet of the first low-pressure heater is connected to the first steam extraction port of the low-pressure cylinder, the shell-side outlet of the first low-pressure heater is connected to the second water inlet of the condensate tank, the tube-side outlet of the second low-pressure heater is connected to the tube-side inlet of the third low-pressure heater, the shell-side inlet of the second low-pressure heater is connected to the second steam extraction port of the low-pressure cylinder, the shell-side outlet of the second low-pressure heater is connected to the tube-side outlet of the second low-pressure heater through a drain delivery pipeline, a drain delivery pipeline is provided with a drain pump, the tube-side outlet of the third low-pressure heater is connected to the first water inlet of the deaerator, the shell-side inlet of the third low-pressure heater is connected to the first steam extraction port of the medium-pressure cylinder, the shell-side outlet of the third low-pressure heater is connected to the drain cooling section in the second low-pressure heater, and the deaerator The drain outlet is connected to the tube side inlet of the first high-pressure heater through a water supply delivery pipeline, and a water supply pump is provided on the water supply delivery pipeline. The steam inlet of the deaerator is connected to the second steam extraction port of the intermediate pressure cylinder, the tube side outlet of the first high-pressure heater is connected to the tube side inlet of the second high-pressure heater, the shell side inlet of the first high-pressure heater is connected to the third steam extraction port of the intermediate pressure cylinder, the shell side outlet of the first high-pressure heater is connected to the second water inlet of the deaerator, the tube side outlet of the second high-pressure heater is connected to the tube side inlet of the third high-pressure heater, the shell side inlet of the second high-pressure heater is connected to the first steam extraction port of the high-pressure cylinder, the shell side outlet of the second high-pressure heater is connected to the drain cooling section in the first high-pressure heater, the tube side outlet of the third high-pressure heater is connected to the water inlet of the boiler, the shell side inlet of the third high-pressure heater is connected to the second steam extraction port of the high-pressure cylinder, and the shell side outlet of the third high-pressure heater is connected to the drain cooling section in the second high-pressure heater.

[0013] According to a preferred embodiment, the heat recovery steam extraction pipeline further includes a shaft seal heater;

[0014] The drain outlet of the condensate tank is connected to the tube side inlet of the shaft seal heater through a condensate delivery pipe, the tube side outlet of the shaft seal heater is connected to the tube side inlet of the first low-pressure heater, the shell side inlet of the shaft seal heater is connected to the shaft seal steam leakage outlet of the turbine unit, and the shell side outlet of the shaft seal heater is connected to the third water inlet of the condensate tank.

[0015] According to a preferred embodiment, the Carnot battery further comprises a charging compressor, a heat pump condenser, a heat storage hot tank and a heat storage cold tank;

[0016] Among them, the tube side outlet of the heat pump evaporator is connected with the steam inlet of the charging compressor, the steam outlet of the charging compressor is connected with the shell side inlet of the heat pump condenser, the shell side outlet of the heat pump condenser is connected with the tube side inlet of the heat pump evaporator through the first working fluid delivery pipeline, the first working fluid delivery pipeline is provided with a throttle valve, the tube side inlet of the heat pump condenser is connected with the heat storage cold tank outlet through the first medium delivery pipeline, the first medium delivery pipeline is provided with a first medium pump and a third valve, the tube side outlet of the heat pump condenser is connected with the heat storage hot tank inlet through the second medium delivery pipeline, and the second medium delivery pipeline is provided with a fourth valve.

[0017] According to a preferred embodiment, the Carnot battery further comprises a heat pump internal regenerator;

[0018] The tube side outlet of the heat pump evaporator is connected to the steam inlet of the charging compressor via the shell side of the heat pump internal regenerator, the shell side outlet of the heat pump condenser is connected to the tube side inlet of the heat pump evaporator via the tube side of the heat pump internal regenerator, and the throttle valve is arranged between the tube side inlet of the heat pump evaporator and the tube side outlet of the heat pump internal regenerator.

[0019] According to a preferred embodiment, the Carnot battery further comprises an organic Rankine cycle evaporator, an expander, a second generator and an organic Rankine cycle condenser, wherein the expander is coaxially arranged with the second generator;

[0020] Among them, the shell side inlet of the organic Rankine cycle evaporator is connected with the outlet of the heat storage tank through a third medium delivery pipeline, and a fifth valve is provided on the third medium delivery pipeline. The shell side outlet of the organic Rankine cycle evaporator is connected with the inlet of the heat storage tank through a fourth medium delivery pipeline, and a sixth valve and a second medium pump are provided on the fourth medium delivery pipeline. The tube side outlet of the organic Rankine cycle evaporator is connected with the steam inlet of the expander, and the exhaust port of the expander is connected with the tube side inlet of the organic Rankine cycle condenser. The tube side outlet of the organic Rankine cycle condenser is connected with the tube side inlet of the organic Rankine cycle evaporator through a second working fluid delivery pipeline, and a working fluid pump is provided on the second working fluid delivery pipeline.

[0021] The present invention also provides a method for coupling operation of a thermoelectric generator set and a Carnot battery for the thermoelectric generator set and Carnot battery coupling system as described above, comprising:

[0022] When in single-machine operation mode, close the first valve and the second valve, the superheated steam generated by the boiler enters the high-pressure cylinder to do work, and part of the steam enters the second high-pressure heater after leaving the high-pressure cylinder, and the remaining steam enters the boiler for reheating. The reheated steam enters the intermediate-pressure cylinder to do work, and the steam enters the low-pressure cylinder to do work after leaving the intermediate-pressure cylinder. The exhaust steam leaving the low-pressure cylinder all enters the air-cooled condenser to be cooled into condensate, and the condensate in the condensate tank is pumped to the shaft seal heater to absorb heat. The shaft seal leakage steam heats the condensate and then condenses into drain and flows into the condensate tank. After leaving the shaft seal heater, the condensate enters the first low-pressure heater to absorb heat, and the extraction steam heats the condensate and then condenses into drain and flows into the condensate tank. The condensate is heated by the first low-pressure heater and then enters the second low-pressure heater to absorb heat. After the extraction steam heats the condensate, it condenses into drain and is pumped into the second low-pressure heater pipe side outlet and the heated The condensate obtained by the mixture enters the third low-pressure heater to absorb heat. The condensate is condensed into drain after being heated by the extraction steam and flows into the drain cooling section in the second low-pressure heater. After the condensate leaves the third low-pressure heater, it enters the deaerator to absorb heat. The extraction steam is mixed with the condensate for heat exchange. After the condensate leaves the deaerator, it enters the feed water pump to boost the pressure into feed water and enters the first high-pressure heater to absorb heat. After the extraction steam heats the hot condensed feed water, it condenses into drain and flows into the deaerator. After the hot condensed feed water leaves the first high-pressure heater, it enters the second high-pressure heater to absorb heat. After the extraction steam heats the hot condensed feed water, it condenses into drain and flows into the drain cooling section in the first high-pressure heater. After the hot condensed feed water leaves the second high-pressure heater, it enters the third high-pressure heater to absorb heat. After the extraction steam heats the hot condensed feed water, it condenses into drain and flows into the drain cooling section in the second high-pressure heater. After the hot condensed feed water leaves the third high-pressure heater, it enters the boiler;

[0023] When in heating condition, heating steam is drawn out from the steam extraction pipeline between the first steam extraction port of the intermediate pressure cylinder and the shell side inlet of the third low pressure heater.

[0024] According to a preferred embodiment, the operating method further comprises:

[0025] When in deep peak load regulation condition, close the fifth valve, the sixth valve and the second medium pump, open the first valve and the second valve, introduce exhaust steam into the heat pump evaporator, open the first medium pump, the second valve, the fourth valve and the charging compressor, the Carnot battery enters the charging state, the vapor working medium enters the heat pump evaporator to absorb heat, the exhaust steam heats the vapor working medium and condenses into saturated water and flows into the condensate tank, the vapor working medium leaves the heat pump evaporator and enters the heat pump internal regenerator to absorb heat, the liquid working medium heats the vapor working medium and enters the throttle valve to reduce pressure and temperature and flows into the heat pump evaporator The first generator consumes electric energy to drive the charging compressor to compress the vapor working medium leaving the regenerator in the heat pump into high-temperature and high-pressure steam. The heat storage medium in the heat storage cold tank enters the heat pump condenser to absorb heat through the first medium pump. The high-temperature and high-pressure steam heats the heat storage medium and condenses it into liquid working medium and flows into the regenerator in the heat pump. The heat storage medium is heated by the heat pump condenser and enters the heat storage hot tank. After the Carnot battery is charged, the first valve, the second valve, the third valve, the fourth valve, the first medium pump and the charging compressor are closed, and the fifth valve and the sixth valve remain closed.

[0026] According to a preferred embodiment, the operating method further comprises:

[0027] When in the maximum heating condition, the first valve, the second valve, the third valve, the fourth valve, the first medium pump and the charging compressor remain closed, the fifth valve, the sixth valve and the second medium pump are opened, the Carnot battery enters the discharge state, the heat storage medium in the heat storage hot tank is introduced into the organic Rankine cycle evaporator through the second medium pump, the liquid working fluid enters the organic Rankine cycle evaporator to absorb heat, the heat storage medium heats the liquid working fluid and then flows into the heat storage cold tank, the liquid working fluid is heated by the organic Rankine cycle evaporator and the discharged vapor working fluid enters the expander to do work, the expander drives the second generator to produce electricity, the vapor working fluid leaving the expander enters the organic Rankine cycle condenser to condense into liquid working fluid and then flows into the organic Rankine cycle evaporator after being pressurized by the working fluid pump.

[0028] The technical solution of a thermoelectric unit and Carnot battery coupling system and operation method provided by the present invention has at least the following advantages and beneficial effects: (1) The Carnot battery is only connected to the exhaust port of the low-pressure cylinder and the water inlet of the condensate tank, and its participation in the operation of the unit is low. It can be easily switched to the single-unit operation mode of the unit, which relatively reduces the complexity of the coupling system and ensures the safety and reliability of the operation; (2) When the coupling system is working, the exhaust steam latent heat of the low-pressure cylinder can be recovered to achieve the cascade utilization of energy and effectively improve the energy utilization rate; (3) Under the deep peak-shaving condition of the unit, the Carnot battery recovers the exhaust steam latent heat and consumes the unit's power generation to complete the power storage, thereby improving the peak-shaving depth of the unit; under the maximum power supply condition of the unit, the Carnot battery discharges to increase the total power generation power of the unit, thereby improving the peak-shaving capacity of the unit; (4) The Carnot battery adopts a heat pump internal regenerator to improve the heat pump performance, thereby improving the round-trip efficiency of the Carnot battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a thermoelectric generator set and a Carnot battery coupling system provided in Example 1 of the present invention;

[0030] Figure 2 A schematic diagram of the structure of a Carnot battery provided in Example 2 of the present invention;

[0031] Icons: 1- boiler, 2- high pressure cylinder, 3- medium pressure cylinder, 4- low pressure cylinder, 5- first generator, 6- air condenser, 7- condensate pump, 8- shaft seal heater, 9- first low pressure heater, 10- second low pressure heater, 11- drain pump, 12- third low pressure heater, 13- extraction pipe, 14- deaerator, 15- feed pump, 16- first high pressure heater, 17- second high pressure heater, 18- third high pressure heater, 19- first valve, 20- Second valve, 21-heat pump evaporator, 22-heat pump internal regenerator, 23-charging compressor, 24-heat pump condenser, 25-throttle valve, 26-third valve, 27-fourth valve, 28-heat storage cold tank, 29-first medium pump, 30-heat storage hot tank, 31-fifth valve, 32-sixth valve, 33-second medium pump, 34-organic Rankine cycle evaporator, 35-expander, 36-second generator, 37-organic Rankine cycle condenser, 38-working fluid pump. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Example 1

[0034] Figure 1 This is a schematic diagram of the structure of the thermoelectric generator set and Carnot battery coupling system provided by an embodiment of the present invention. Figure 1 As shown, the thermal power unit and Carnot battery coupling system includes a steam turbine generator subsystem and a Carnot battery.

[0035] Among them, the steam turbine generating subsystem includes a boiler 1, a steam turbine unit, an air-cooled condenser 6 and a heat recovery extraction pipeline; the steam turbine unit includes a coaxially connected high-pressure cylinder 2, an intermediate-pressure cylinder 3, a low-pressure cylinder 4 and a first generator 5; the steam inlet of the high-pressure cylinder 2 is connected to the steam outlet of the boiler 1, the exhaust port of the high-pressure cylinder 2 is connected to the reheat steam inlet of the boiler 1, the reheat steam exhaust port of the boiler 1 is connected to the steam inlet of the intermediate-pressure cylinder 3, the exhaust port of the intermediate-pressure cylinder 3 is connected to the steam inlet of the low-pressure cylinder 4, the superheated steam generated by the boiler 1 enters the high-pressure cylinder 2 to do work, the steam after leaving the high-pressure cylinder 2 is reheated by the boiler 1 and enters the intermediate-pressure cylinder 3 and the low-pressure cylinder 4 to do work, the high-pressure cylinder 2, the intermediate-pressure cylinder 3 and the low-pressure cylinder 4 transmit the generated mechanical energy to the first generator 5 to generate electrical energy.

[0036] The exhaust pipe that collects the two exhaust ports of the low-pressure cylinder 4 is connected to the steam inlet of the air-cooled condenser 6. Under the single-machine operation mode of the unit, all the exhaust steam discharged from the low-pressure cylinder 4 enters the air-cooled condenser 6 to condense into condensate, and the condensate flows into the condensate tank of the air-cooled condenser 6 for storage; the drain port of the condensate tank is connected to the water inlet of the heat recovery steam extraction pipeline through a condensate conveying pipeline, and a condensate pump 7 is provided on the condensate conveying pipeline. The drain port of the heat recovery steam extraction pipeline is connected to the water inlet of the boiler 1, and the feed water enters the boiler 1 after leaving the heat recovery steam extraction pipeline, completing a round of thermal cycle.

[0037] Furthermore, the Carnot battery includes a heat pump evaporator 21, and the shell side inlet of the heat pump evaporator 21 is connected to the exhaust pipe of the low-pressure cylinder 4 through the exhaust steam delivery pipeline; the exhaust steam delivery pipeline is provided with a first valve 19, and the low-temperature exhaust steam discharged from the low-pressure cylinder 4 enters the heat pump evaporator 21 through the first valve 19 and is used as a heat exchange heat source. Under deep peak-shaving conditions, part or all of the exhaust steam discharged from the low-pressure cylinder 4 enters the heat pump evaporator 21 to heat the working fluid in the Carnot battery; the shell side outlet of the heat pump evaporator 21 is connected to the first water inlet of the condensate water tank through a saturated water delivery pipeline, and the saturated water delivery pipeline is provided with a second valve 20. After the exhaust steam heats the working fluid, it condenses into saturated water and flows into the condensate water tank. Among them, it should be noted that the Carnot battery is only connected to the exhaust port of the low-pressure cylinder 4 and the water inlet of the condensate tank. By controlling the first valve 19 and the second valve 20, the connection between the thermal power unit and the Carnot battery can be disconnected; the degree of participation of the Carnot battery in the operation of the unit is low, and it can be easily switched to the single-unit operation mode of the unit, which relatively reduces the complexity of the coupling system and ensures the safety and reliability of the operation; in addition, when the coupling system is working, the exhaust steam latent heat of the low-pressure cylinder 4 can be recovered to realize the cascade utilization of energy and effectively improve the energy utilization rate.

[0038] Example 2

[0039] This embodiment is based on the technical solution provided in Example 1, and further describes the structure of the heat recovery steam extraction pipeline:

[0040] In this embodiment, the heat recovery steam extraction pipeline includes a first low-pressure heater 9, a second low-pressure heater 10, a third low-pressure heater 12, a deaerator 14, a first high-pressure heater 16, a second high-pressure heater 17 and a third high-pressure heater 18.

[0041] The drain outlet of the condensate tank is connected to the tube side inlet of the first low-pressure heater 9 through the condensate delivery pipeline; the tube side outlet of the first low-pressure heater 9 is connected to the tube side inlet of the second low-pressure heater 10, and the condensate enters the second low-pressure heater 10 to absorb heat after being heated by the first low-pressure heater 9. The shell side inlet of the first low-pressure heater 9 is connected to the first steam extraction port of the low-pressure cylinder 4, and the shell side outlet of the first low-pressure heater 9 is connected to the second water inlet of the condensate tank. The tube side outlet of the second low-pressure heater 10 is connected to the tube side inlet of the third low-pressure heater 12, the shell side inlet of the second low-pressure heater 10 is connected to the second steam extraction port of the low-pressure cylinder 4, and the shell side outlet of the second low-pressure heater 10 is connected to the tube side outlet of the second low-pressure heater 10 through a drain delivery pipeline, and a drain pump 11 is provided on the drain delivery pipeline. The tube side outlet of the third low-pressure heater 12 is connected to the first water inlet of the deaerator 14, the shell side inlet of the third low-pressure heater 12 is connected to the first steam extraction port of the medium-pressure cylinder 3, and the shell side outlet of the third low-pressure heater 12 is connected to the hydrophobic cooling section in the second low-pressure heater 10.

[0042] The drain outlet of the deaerator 14 is connected to the tube side inlet of the first high-pressure heater 16 through a water supply pipeline. A water supply pump 15 is provided on the water supply pipeline. The steam inlet of the deaerator 14 is connected to the second steam extraction port of the intermediate pressure cylinder 3.

[0043] The tube side outlet of the first high pressure heater 16 is connected to the tube side inlet of the second high pressure heater 17, the shell side inlet of the first high pressure heater 16 is connected to the third steam extraction port of the intermediate pressure cylinder 3, and the shell side outlet of the first high pressure heater 16 is connected to the second water inlet of the deaerator 14. The tube side outlet of the second high pressure heater 17 is connected to the tube side inlet of the third high pressure heater 18, the shell side inlet of the second high pressure heater 17 is connected to the first steam extraction port of the high pressure cylinder 2, and the shell side outlet of the second high pressure heater 17 is connected to the drain cooling section in the first high pressure heater 16. The tube side outlet of the third high pressure heater 18 is connected to the water inlet of the boiler 1, the shell side inlet of the third high pressure heater 18 is connected to the second steam extraction port of the high pressure cylinder 2, and the shell side outlet of the third high pressure heater 18 is connected to the drain cooling section in the second high pressure heater 17.

[0044] Example 3

[0045] This embodiment is based on the technical solution provided in Example 2, and provides a supplementary explanation of the structure of the heat recovery steam extraction pipeline:

[0046] In this embodiment, the heat recovery steam extraction pipeline further includes a shaft seal heater 8 .

[0047] The drain outlet of the condensate tank is connected to the tube side inlet of the shaft seal heater 8 through the condensate delivery pipe, the tube side outlet of the shaft seal heater 8 is connected to the tube side inlet of the first low-pressure heater 9, the shell side inlet of the shaft seal heater 8 is connected to the shaft seal steam leakage outlet of the turbine unit, and the shell side outlet of the shaft seal heater 8 is connected to the third water inlet of the condensate tank.

[0048] Example 4

[0049] This embodiment is based on the technical solution provided in Example 1, and further describes the structure of the Carnot battery:

[0050] In this embodiment, the Carnot battery further includes a charging compressor 23 , a heat pump condenser 24 , a heat storage hot tank 30 , and a heat storage cold tank 28 .

[0051] The tube side outlet of the heat pump evaporator 21 is connected to the steam inlet of the charging compressor 23, the steam outlet of the charging compressor 23 is connected to the shell side inlet of the heat pump condenser 24, the shell side outlet of the heat pump condenser 24 is connected to the tube side inlet of the heat pump evaporator 21 via the first working fluid delivery pipeline, and a throttle valve 25 is provided on the first working fluid delivery pipeline.

[0052] The tube side inlet of the heat pump condenser 24 is connected to the outlet of the heat storage cold tank 28 via a first medium delivery pipeline, on which a first medium pump 29 and a third valve 26 are provided. The tube side outlet of the heat pump condenser 24 is connected to the inlet of the heat storage hot tank 30 via a second medium delivery pipeline, on which a fourth valve 27 is provided.

[0053] Example 5

[0054] This embodiment is based on the technical solution provided in Example 4, and provides a supplementary explanation of the structure of the Carnot battery:

[0055] In this embodiment, the Carnot battery further includes a heat pump internal regenerator 22 .

[0056] The tube side outlet of the heat pump evaporator 21 is connected to the steam inlet of the charging compressor 23 via the shell side of the heat pump internal heat regenerator 22, the shell side outlet of the heat pump condenser 24 is connected to the tube side inlet of the heat pump evaporator 21 via the tube side of the heat pump internal heat regenerator 22, and the throttle valve 25 is arranged between the tube side inlet of the heat pump evaporator 21 and the tube side outlet of the heat pump internal heat regenerator 22.

[0057] It should be noted that the Carnot battery uses a heat pump internal regenerator 22 to improve the heat pump performance, thereby improving the round-trip efficiency of the Carnot battery.

[0058] Example 6

[0059] This embodiment is based on the technical solution provided in Example 5, and provides a supplementary explanation of the structure of the Carnot battery:

[0060] In this embodiment, the Carnot battery further includes an organic Rankine cycle evaporator 34 , an expander 35 , a second generator 36 and an organic Rankine cycle condenser 37 , and the expander 35 and the second generator 36 are coaxially arranged.

[0061] The shell side inlet of the organic Rankine cycle evaporator 34 is connected to the outlet of the heat storage tank 30 via a third medium delivery pipeline, and a fifth valve 31 is provided on the third medium delivery pipeline. The shell side outlet of the organic Rankine cycle evaporator 34 is connected to the inlet of the heat storage tank 28 via a fourth medium delivery pipeline, and a sixth valve 32 and a second medium pump 33 are provided on the fourth medium delivery pipeline.

[0062] The tube side outlet of the organic Rankine cycle evaporator 34 is connected to the steam inlet of the expander 35, the exhaust port of the expander 35 is connected to the tube side inlet of the organic Rankine cycle condenser 37, the tube side outlet of the organic Rankine cycle condenser 37 is connected to the tube side inlet of the organic Rankine cycle evaporator 34 through a second working fluid delivery pipeline, and a working fluid pump 38 is provided on the second working fluid delivery pipeline.

[0063] Example 7

[0064] This embodiment is based on the technical solutions provided in Embodiments 1 to 6, and further describes the coupling operation method of the thermoelectric generator set and the Carnot battery:

[0065] When in single-machine operation mode, close the first valve 19 and the second valve 20, the superheated steam generated by the boiler 1 enters the high-pressure cylinder 2 to perform work, and after leaving the high-pressure cylinder 2, part of the steam enters the second high-pressure heater 17, and the rest of the steam enters the boiler 1 for reheating, and the reheated steam enters the intermediate-pressure cylinder 3 to perform work, and after leaving the intermediate-pressure cylinder 3, the steam enters the low-pressure cylinder 4 to perform work, and all the exhaust steam leaving the low-pressure cylinder 4 enters the air-cooled condenser 6 to be cooled into condensate.

[0066] The condensate in the condensate tank is sent to the shaft seal heater 8 through the condensate pump 7 to absorb heat. The shaft seal leakage steam heats the condensate and then condenses it into drain and flows into the condensate tank. After leaving the shaft seal heater 8, the condensate enters the first low-pressure heater 9 to absorb heat. The extraction steam heats the condensate and then condenses it into drain and flows into the condensate tank. After being heated by the first low-pressure heater 9, the condensate enters the second low-pressure heater 10 to absorb heat. After the extraction steam heats the condensate, it condenses it into drain and is pumped into the pipe side outlet of the second low-pressure heater 10 through the drain pump 11 to mix with the heated condensate. The mixed condensate enters the third low-pressure heater 12 to absorb heat. After the extraction steam heats the condensate, it condenses it into drain and flows into the drain cooling section in the second low-pressure heater 10. After leaving the third low-pressure heater 12, the condensate enters the deaerator 14 to absorb heat, and the extraction steam and condensate are mixed for heat exchange.

[0067] After leaving the deaerator 14, the condensed water enters the feed water pump 15 to be pressurized into feed water and enters the first high-pressure heater 16 to absorb heat. After the extraction steam heats the condensed feed water, it is condensed into drain and flows into the deaerator 14. After leaving the first high-pressure heater 16, the condensed feed water enters the second high-pressure heater 17 to absorb heat. After the extraction steam heats the condensed feed water, it is condensed into drain and flows into the drain cooling section in the first high-pressure heater 16. After leaving the second high-pressure heater 17, the condensed feed water enters the third high-pressure heater 18 to absorb heat. After the extraction steam heats the condensed feed water, it is condensed into drain and flows into the drain cooling section in the second high-pressure heater 17. After leaving the third high-pressure heater 18, the condensed feed water enters the boiler 1.

[0068] When in heating condition, heating steam is drawn out from the steam extraction pipe 13 between the first steam extraction port of the intermediate pressure cylinder 3 and the shell side inlet of the third low pressure heater 12 .

[0069] When in deep peak load regulation condition, close the fifth valve 31, the sixth valve 32 and the second medium pump 33, open the first valve 19 and the second valve 20, introduce the exhaust steam into the heat pump evaporator 21, open the first medium pump 29, the second valve 20, the fourth valve 27 and the charging compressor 23, and the Carnot battery enters the charging state.

[0070] After the Carnot battery enters the charging state, the heat pump refrigerant working medium in the wet saturated vapor state enters the heat pump evaporator 21 to absorb heat, and the exhaust steam heats the vapor working medium and condenses into saturated water and flows into the condensate tank. The saturated vapor or slightly superheated working medium leaves the heat pump evaporator 21 and enters the heat pump internal regenerator 22 to absorb heat. The liquid working medium heats the vapor working medium and enters the throttle valve 25 to reduce pressure and temperature, and obtains a low-pressure and low-temperature wet saturated vapor working medium with a temperature lower than that of the exhaust steam and flows into the heat pump evaporator 21. The first generator 5 consumes electrical energy to drive the charging pressure The compressor 23 compresses the vapor working medium leaving the heat pump regenerator 22 into high-temperature and high-pressure steam. The heat storage medium in the heat storage cold tank 28 enters the heat pump condenser 24 to absorb heat through the first medium pump 29. The high-temperature and high-pressure steam heats the heat storage medium and condenses it into a supercooled liquid working medium and flows into the heat pump regenerator 22. The heat storage medium is heated by the heat pump condenser 24 and enters the heat storage hot tank 30. The supercooled liquid working medium still has a certain energy taste. By setting the heat pump regenerator, part of the heat energy carried by the liquid working medium can be recovered.

[0071] After the Carnot battery is charged, the first valve 19, the second valve 20, the third valve 26, the fourth valve 27, the first medium pump 29 and the charging compressor 23 are closed, and the fifth valve 31 and the sixth valve 32 remain closed.

[0072] It should be noted that under the deep peak-shaving condition of the unit, the Carnot battery recovers the latent heat of exhaust steam and consumes the unit's power generation to complete power storage, thereby increasing the peak-shaving depth of the unit; under the unit's maximum power supply condition, the Carnot battery discharges, increasing the unit's total power generation power, thereby improving the unit's peak-shaving capacity.

[0073] When in the maximum heating condition, the first valve 19, the second valve 20, the third valve 26, the fourth valve 27, the first medium pump 29 and the charging compressor 23 remain closed, the fifth valve 31, the sixth valve 32 and the second medium pump 33 are opened, and the Carnot battery enters the discharge state.

[0074] After the Carnot battery enters the discharge state, the heat storage medium in the heat storage hot tank 30 is introduced into the organic Rankine cycle evaporator 34 through the second medium pump 33, and the liquid working medium enters the organic Rankine cycle evaporator 34 to absorb heat. The heat storage medium heats the liquid working medium and then flows into the heat storage cold tank 28. The vapor working medium discharged after the liquid working medium is heated by the organic Rankine cycle evaporator 34 enters the expander 35 to do work, and the expander 35 drives the second generator 36 to produce electricity. The vapor working medium leaving the expander 35 enters the organic Rankine cycle condenser 37 to condense into liquid working medium and then flows into the organic Rankine cycle evaporator 34 after being pressurized by the working medium pump 38.

[0075] The discharge process ensures that the Carnot battery does not consume any fuel or unit thermal energy, and only relies on its own heat storage to generate electricity. When the unit is operating at maximum heating conditions and the electrical load cannot be increased any further, the amount of electricity connected to the grid is increased, further increasing the maximum power generation load.

[0076] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A thermoelectric generator and Carnot battery coupling system, characterized in that: The coupling system includes a steam turbine generator subsystem and a Carnot battery; The steam turbine generating subsystem comprises a boiler (1), a steam turbine unit, an air-cooled condenser (6) and a heat recovery steam extraction pipeline. The steam turbine unit comprises a high-pressure cylinder (2), a medium-pressure cylinder (3), a low-pressure cylinder (4) and a first generator (5) which are coaxially connected. The steam inlet of the high-pressure cylinder (2) is connected to the steam outlet of the boiler (1). The exhaust pipe of the low-pressure cylinder (4) is connected to the steam inlet of the air-cooled condenser (6). The drain outlet of the condensate tank of the air-cooled condenser (6) is connected to the water inlet of the heat recovery steam extraction pipeline via a condensate delivery pipeline. A condensate pump (7) is provided on the condensate delivery pipeline. The drain outlet of the heat recovery steam extraction pipeline is connected to the water inlet of the boiler (1). The Carnot battery comprises a heat pump evaporator (21), the shell side inlet of the heat pump evaporator (21) is connected to the exhaust pipe of the low-pressure cylinder (4) through an exhaust steam delivery pipeline, the exhaust steam delivery pipeline is provided with a first valve (19), the low-temperature exhaust steam discharged from the low-pressure cylinder (4) enters the heat pump evaporator (21) through the first valve (19) and is used as a heat exchange heat source, the shell side outlet of the heat pump evaporator (21) is connected to the first water inlet of the condensate tank through a saturated water delivery pipeline, and the saturated water delivery pipeline is provided with a second valve (20).

2. The thermoelectric generator and Carnot battery coupling system according to claim 1, characterized in that: The steam exhaust port of the high-pressure cylinder (2) is connected to the steam inlet port of the reheated steam of the boiler (1), the steam exhaust port of the reheated steam of the boiler (1) is connected to the steam inlet port of the medium-pressure cylinder (3), and the steam exhaust port of the medium-pressure cylinder (3) is connected to the steam inlet port of the low-pressure cylinder (4).

3. The thermoelectric generator and Carnot battery coupling system according to claim 2, characterized in that: The heat recovery steam extraction pipeline comprises a first low-pressure heater (9), a second low-pressure heater (10), a third low-pressure heater (12), a deaerator (14), a first high-pressure heater (16), a second high-pressure heater (17) and a third high-pressure heater (18); The drain outlet of the condensate tank is connected to the tube side inlet of the first low-pressure heater (9) through the condensate delivery pipeline, the tube side outlet of the first low-pressure heater (9) is connected to the tube side inlet of the second low-pressure heater (10), the shell side inlet of the first low-pressure heater (9) is connected to the first steam extraction port of the low-pressure cylinder (4), the shell side outlet of the first low-pressure heater (9) is connected to the second water inlet of the condensate tank, the tube side outlet of the second low-pressure heater (10) is connected to the tube side inlet of the third low-pressure heater (12), and the shell side inlet of the second low-pressure heater (10) is connected to the first steam extraction port of the low-pressure cylinder (4). The shell side outlet of the second low-pressure heater (10) is connected to the tube side outlet of the second low-pressure heater (10) through a drain delivery pipeline, and a drain pump (11) is provided on the drain delivery pipeline. The tube side outlet of the third low-pressure heater (12) is connected to the first water inlet of the deaerator (14), the shell side inlet of the third low-pressure heater (12) is connected to the first steam extraction port of the medium-pressure cylinder (3), the shell side outlet of the third low-pressure heater (12) is connected to the drain cooling section in the second low-pressure heater (10), and the drain outlet of the deaerator (14) is connected to the drain cooling section in the second low-pressure heater (10). The water delivery pipeline is connected to the tube side inlet of the first high-pressure heater (16), a water supply pump (15) is provided on the water supply pipeline, the steam inlet of the deaerator (14) is connected to the second steam extraction port of the intermediate pressure cylinder (3), the tube side outlet of the first high-pressure heater (16) is connected to the tube side inlet of the second high-pressure heater (17), the shell side inlet of the first high-pressure heater (16) is connected to the third steam extraction port of the intermediate pressure cylinder (3), the shell side outlet of the first high-pressure heater (16) is connected to the second water inlet of the deaerator (14), and the tube side outlet of the second high-pressure heater (17) is connected to the The tube side inlet of the third high-pressure heater (18) is connected, the shell side inlet of the second high-pressure heater (17) is connected to the first steam extraction port of the high-pressure cylinder (2), the shell side outlet of the second high-pressure heater (17) is connected to the drain cooling section in the first high-pressure heater (16), the tube side outlet of the third high-pressure heater (18) is connected to the water inlet of the boiler (1), the shell side inlet of the third high-pressure heater (18) is connected to the second steam extraction port of the high-pressure cylinder (2), and the shell side outlet of the third high-pressure heater (18) is connected to the drain cooling section in the second high-pressure heater (17).

4. The thermoelectric generator and Carnot battery coupling system according to claim 3, characterized in that: The heat recovery steam extraction pipeline further includes a shaft seal heater (8); The drain outlet of the condensate tank is connected to the tube side inlet of the shaft seal heater (8) via a condensate delivery pipeline, the tube side outlet of the shaft seal heater (8) is connected to the tube side inlet of the first low-pressure heater (9), the shell side inlet of the shaft seal heater (8) is connected to the shaft seal steam leakage outlet of the turbine unit, and the shell side outlet of the shaft seal heater (8) is connected to the third water inlet of the condensate tank.

5. The thermoelectric generator and Carnot battery coupling system according to claim 4, characterized in that: The Carnot battery also includes a charging compressor (23), a heat pump condenser (24), a heat storage hot tank (30) and a heat storage cold tank (28); The tube side outlet of the heat pump evaporator (21) is connected to the steam inlet of the charging compressor (23), the steam outlet of the charging compressor (23) is connected to the shell side inlet of the heat pump condenser (24), the shell side outlet of the heat pump condenser (24) is connected to the tube side inlet of the heat pump evaporator (21) via a first working fluid delivery pipeline, a throttle valve (25) is provided on the first working fluid delivery pipeline, the tube side inlet of the heat pump condenser (24) is connected to the outlet of the heat storage cold tank (28) via a first medium delivery pipeline, a first medium pump (29) and a third valve (26) are provided on the first medium delivery pipeline, the tube side outlet of the heat pump condenser (24) is connected to the inlet of the heat storage hot tank (30) via a second medium delivery pipeline, and a fourth valve (27) is provided on the second medium delivery pipeline.

6. The thermoelectric generator and Carnot battery coupling system according to claim 5, characterized in that: The Carnot battery also includes a heat pump internal regenerator (22); The tube side outlet of the heat pump evaporator (21) is connected to the steam inlet of the charging compressor (23) via the shell side of the heat pump internal heat regenerator (22), and the shell side outlet of the heat pump condenser (24) is connected to the tube side inlet of the heat pump evaporator (21) via the tube side of the heat pump internal heat regenerator (22). The throttle valve (25) is arranged between the tube side inlet of the heat pump evaporator (21) and the tube side outlet of the heat pump internal heat regenerator (22).

7. The thermoelectric generator and Carnot battery coupling system according to claim 6, characterized in that: The Carnot battery further comprises an organic Rankine cycle evaporator (34), an expander (35), a second generator (36) and an organic Rankine cycle condenser (37), wherein the expander (35) and the second generator (36) are coaxially arranged; The shell side inlet of the organic Rankine cycle evaporator (34) is connected to the outlet of the heat storage tank (30) via a third medium delivery pipeline, and a fifth valve (31) is provided on the third medium delivery pipeline. The shell side outlet of the organic Rankine cycle evaporator (34) is connected to the inlet of the heat storage tank (28) via a fourth medium delivery pipeline, and a sixth valve (32) and a second medium pump (33) are provided on the fourth medium delivery pipeline. The tube side outlet of the organic Rankine cycle evaporator (34) is connected to the steam inlet of the expander (35), and the exhaust port of the expander (35) is connected to the tube side inlet of the organic Rankine cycle condenser (37). The tube side outlet of the organic Rankine cycle condenser (37) is connected to the tube side inlet of the organic Rankine cycle evaporator (34) via a second working fluid delivery pipeline, and a working fluid pump (38) is provided on the second working fluid delivery pipeline.

8. The method for operating the thermoelectric generator and Carnot battery coupling system according to claim 7, characterized in that: include: When in single-machine operation mode, the first valve (19) and the second valve (20) are closed, and the superheated steam generated by the boiler (1) enters the high-pressure cylinder (2) to perform work. After the steam leaves the high-pressure cylinder (2), part of it enters the second high-pressure heater (17), and the rest of the steam enters the boiler (1) for reheating. The reheated steam enters the medium-pressure cylinder (3) to perform work. After the steam leaves the medium-pressure cylinder (3), it enters the low-pressure cylinder (4) to perform work. All the exhaust steam leaving the low-pressure cylinder (4) enters the air-cooled condenser (6) to be cooled into condensate, and the exhaust steam in the condensate tank is cooled to condensate. The condensate is sent to the shaft seal heater (8) through the condensate pump (7) to absorb heat. The shaft seal leakage steam heats the condensate and condenses it into drainage water and flows into the condensate tank. After leaving the shaft seal heater (8), the condensate enters the first low-pressure heater (9) to absorb heat. The extraction steam heats the condensate and condenses it into drainage water and flows into the condensate tank. After being heated by the first low-pressure heater (9), the condensate enters the second low-pressure heater (10) to absorb heat. After being heated by the extraction steam, the condensate condenses it into drainage water and is pumped into the pipe side outlet of the second low-pressure heater (10) through the drainage pump (11) to meet the condensate. The heated condensate is mixed, and the mixed condensate enters the third low-pressure heater (12) to absorb heat. The extraction steam heats the condensate and condenses it into drain water and flows into the drain cooling section in the second low-pressure heater (10). After the condensate leaves the third low-pressure heater (12), it enters the deaerator (14) to absorb heat. The extraction steam and the condensate are mixed for heat exchange. After the condensate leaves the deaerator (14), it enters the feed water pump (15) to increase the pressure to feed water and enters the first high-pressure heater (16) to absorb heat. After the extraction steam heats the hot condensed feed water, it condenses it into drain water and flows into the deaerator. The condensed feed water leaves the first high-pressure heater (16) and enters the second high-pressure heater (17) to absorb heat. The condensed feed water is heated by extraction steam and condensed into drain water and flows into the drain cooling section in the first high-pressure heater (16). The condensed feed water leaves the second high-pressure heater (17) and enters the third high-pressure heater (18) to absorb heat. The condensed feed water is heated by extraction steam and condensed into drain water and flows into the drain cooling section in the second high-pressure heater (17). The condensed feed water leaves the third high-pressure heater (18) and enters the boiler (1); When in heating operation, heating steam is drawn out from a steam extraction pipe (13) between the first steam extraction port of the intermediate pressure cylinder (3) and the shell side inlet of the third low pressure heater (12).

9. The method for coupling operation of a thermoelectric generator set and a Carnot battery according to claim 8, characterized in that: Also includes: When in deep peak load regulation, the fifth valve (31), the sixth valve (32) and the second medium pump (33) are closed, the first valve (19) and the second valve (20) are opened, the exhaust steam is introduced into the heat pump evaporator (21), the first medium pump (29), the second valve (20), the fourth valve (27) and the charging compressor (23) are opened, the Carnot battery enters the charging state, the vapor working medium enters the heat pump evaporator (21) to absorb heat, the exhaust steam heats the vapor working medium and condenses into saturated water and flows into the condensate tank, the vapor working medium leaves the heat pump evaporator (21) and enters the heat pump internal regenerator (22) to absorb heat, the liquid working medium heats the vapor working medium and enters the throttle valve (25) to reduce pressure and temperature and flows into the heat pump evaporator (21), the first generator is turned on. The motor (5) consumes electric energy to drive the charging compressor (23) to compress the vaporous working medium leaving the heat pump regenerator (22) into high-temperature and high-pressure steam. The heat storage medium in the heat storage cold tank (28) enters the heat pump condenser (24) to absorb heat through the first medium pump (29). The high-temperature and high-pressure steam heats the heat storage medium and condenses it into a liquid working medium and flows into the heat pump regenerator (22). The heat storage medium enters the heat storage hot tank (30) after being heated by the heat pump condenser (24). After the charging of the Carnot battery is completed, the first valve (19), the second valve (20), the third valve (26), the fourth valve (27), the first medium pump (29) and the charging compressor (23) are closed, and the fifth valve (31) and the sixth valve (32) remain closed.

10. The method for coupling operation of a thermoelectric generator set and a Carnot battery according to claim 9, characterized in that: Also includes: When in the maximum heating condition, the first valve (19), the second valve (20), the third valve (26), the fourth valve (27), the first medium pump (29) and the charging compressor (23) remain closed, the fifth valve (31), the sixth valve (32) and the second medium pump (33) are opened, the Carnot battery enters the discharge state, the heat storage medium in the heat storage tank (30) is introduced into the organic Rankine cycle evaporator (34) through the second medium pump (33), and the liquid working fluid enters the organic Rankine cycle evaporator (34). The organic Rankine cycle evaporator (34) absorbs heat, and the heat storage medium heats the liquid working fluid and then flows into the heat storage cold tank (28). The vapor working fluid discharged after the liquid working fluid is heated by the organic Rankine cycle evaporator (34) enters the expander (35) to perform work, and the expander (35) drives the second generator (36) to produce electrical energy. The vapor working fluid leaving the expander (35) enters the organic Rankine cycle condenser (37) to be condensed into a liquid working fluid and is pressurized by the working fluid pump (38) and then flows into the organic Rankine cycle evaporator (34).

Images