Carnot battery unit low-steam reactive operation system and working method

Abstract

The invention belongs to the technical field of Carnot battery energy storage, and particularly relates to a low-steam reactive operation system of a Carnot battery unit and a working method. Comprising a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder which are sequentially connected, in the working state, blades in the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder rotate highly and release a large amount of heat energy, cooling steam is introduced into a steam inlet of the high-pressure cylinder, a steam inlet of the medium-pressure cylinder and a steam inlet of the low-pressure cylinder at the moment, and cooling is conducted through the cooling steam; and friction blast heat can be taken away, so that stable temperature distribution of a through-flow part is maintained, meanwhile, flutter and water erosion of the blades are avoided, and the economical efficiency and the safety of operation of the Carnot battery unit are guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of Carnot battery energy storage, and particularly relates to a system and working method for low-steam reactive power operation of a Carnot battery unit. Background Technique

[0002] A Carnot battery refers to a large-scale power energy storage system based on heat storage. During the charging stage, electrical energy is converted into heat energy and stored in a certain form; during the discharging stage, the heat energy is converted back into electrical energy for reuse. It is a new emerging electrical energy storage technology that can achieve medium to large-scale electrical energy storage at low cost and without geographical restrictions. The energy storage scale of the system can be as high as 100MW / 1000MWh. It is expected to solve the global problem of renewable electrical energy storage and can provide a more economical and environmentally friendly energy storage solution compared to traditional battery energy storage.

[0003] A Carnot battery system consists of three parts: electrical-to-thermal energy conversion, heat energy storage, and heat-to-electricity generation. It can be used for grid energy storage, storing excess power from variable renewable energy sources and generating electricity when needed. The Carnot battery technology developed based on molten salt energy storage technology is mainly applied to the construction of independent molten salt energy storage power stations and the reuse and transformation of retired units. Replacing the boiler with a Carnot battery comprehensively, that is, on the basis of the existing unit, the boiler and its auxiliary equipment are removed or bypassed as a whole, and a new molten salt heat storage system is built and combined with the existing unit's thermal system to form a Carnot battery molten salt energy storage power station. Transforming a thermal power unit into a Carnot battery molten salt energy storage power station can not only retain most of the equipment and assets of the current thermal power station but also avoid the social problem of a large number of personnel being unemployed in a short time for the country and energy companies. The transformed Carnot battery has the advantages of low cost and large scale, and at the same time solves the problem of the continued reuse of future retired units.

[0004] The operation of the steam turbine is intermittent. It generates electricity when the clearing price is high and only stores heat in the molten salt when the clearing price is low. If the steam turbine stops during energy storage, on the one hand, it cannot cope with the alternating operation and stop conditions within a short period, and on the other hand, when the shutdown time is long, the start-up time is also long, and the start-up requires energy-consuming operations such as warming up and flushing. Most of the stored heat is used for starting up, resulting in low overall system utilization efficiency. Therefore, to improve the energy storage utilization rate, it is necessary to keep the steam turbine in a high-speed rotating state and a hot standby state during the energy storage stage.

[0005] When a steam turbine operates with little steam and reactive power, the steam turbine unit is in a grid-connected state and requires a small amount of grid power to drive the unit to rotate. At this time, the generator operates in motor mode and supplies a large amount of reactive power to the grid to solve the problem of voltage rise caused by the lack of reactive power in the grid during the low-power consumption period. When operating with little steam and reactive power, the steam turbine generator set is incorporated into the power system as a synchronous phase modifier. At this time, the steam turbine maintains an operation speed of 3000 r / min, and the rotor is in a high-speed rotation state. Due to the continuous generation of heat inside the cylinder caused by the blowing friction, the temperature inside the cylinder body will inevitably rise, leading to overheating of the cylinder body and blades, affecting the safe operation of the unit. Summary of the Invention

[0006] The purpose of the present invention is to overcome the problem that the temperature inside the cylinder body and blades of an existing Carnot battery molten salt energy storage power station is too high during operation, affecting the safe operation of the unit, and to provide a system and working method for a Carnot battery unit to operate with little steam and reactive power.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A system for a Carnot battery unit to operate with little steam and reactive power includes a high-pressure cylinder, an intermediate-pressure cylinder, and a low-pressure cylinder. Among them, the high-pressure cylinder, the intermediate-pressure cylinder, and the low-pressure cylinder are connected in sequence, and cooling steam is respectively introduced into the steam inlet of the high-pressure cylinder, the steam inlet of the intermediate-pressure cylinder, and the steam inlet of the low-pressure cylinder.

[0009] The cooling steam comes from one or a combination of external adjacent unit auxiliary steam, the exhaust steam of the high-pressure cylinder (11), and the exhaust steam of the intermediate-pressure cylinder (12).

[0010] It includes a Carnot battery unit, and the Carnot battery unit includes:

[0011] Electric energy to heat energy conversion system: including an electric heater for converting the electric energy of the electric heater into heat energy;

[0012] Heat energy storage system: connected to the electric energy to heat energy conversion system for storing the heat energy converted from electric energy;

[0013] Heat energy power generation system: connected to the heat energy storage system for converting the stored heat energy into steam and introducing it into the high-pressure cylinder, the intermediate-pressure cylinder, and the low-pressure cylinder to drive the generator to generate electricity.

[0014] The electric energy to heat energy conversion system includes a low-temperature molten salt storage tank. The outlet of the low-temperature molten salt storage tank is connected to the inlet of the first molten salt pump. The outlet of the first molten salt pump is connected to the inlet of the electric heater. The outlet of the electric heater is connected to the inlet of the high-temperature molten salt storage tank.

[0015] The electric energy to heat energy conversion system includes a heat pump cycle compressor. The inlet of the heat pump cycle compressor is connected to the low-temperature molten salt storage tank, and the outlet is connected to the high-temperature molten salt storage tank.

[0016] The thermal power generation system includes a second molten salt pump. The inlet of the second molten salt pump is connected to the outlet of the high-temperature molten salt storage tank. The molten salt in the high-temperature molten salt storage tank is divided into two paths after passing through the second molten salt pump for heat exchange, and the heat-exchanged working medium is respectively sent into the high-pressure cylinder and the intermediate-pressure cylinder. The molten salt after heat exchange and cooling returns to the low-temperature molten salt storage tank.

[0017] The outlet of the high-pressure cylinder is connected to the inlet of the intermediate-pressure cylinder, the outlet of the intermediate-pressure cylinder is connected to the inlet of the low-pressure cylinder, the outlet of the low-pressure cylinder is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the condensate pump, the outlet of the condensate pump is connected to the inlet of the low-pressure heater system, the outlet of the low-pressure heater system is connected to the inlet of the deaerator, the outlet of the intermediate-pressure cylinder is connected to the inlet of the deaerator, the outlet of the deaerator is connected to the inlet of the feed water pump, the outlet of the feed water pump is connected to the inlet of the high-pressure heater system, the outlet of the high-pressure heater system is connected to the inlet of the feed water preheater, and the outlet of the feed water preheater is connected to the thermal power generation system for the water heat exchange process;

[0018] It includes a cooling tower, and the cooling tower is connected to the condenser.

[0019] The thermal power generation system includes a molten salt superheater, a molten salt steam generator, and a molten salt preheater connected in sequence. The inlet of the molten salt superheater is connected to the outlet of the second molten salt pump, and the molten salt preheater is connected to the outlet of the feed water preheater.

[0020] A working method of a Carnot battery unit with less steam and reactive power operation system is to introduce cooling steam into the steam inlet of the high-pressure cylinder, the steam inlet of the intermediate-pressure cylinder, and the steam inlet of the low-pressure cylinder respectively to cool the inside of the cylinder.

[0021] The thermal power generation system of the Carnot battery unit conducts two-way heat exchange. One-way thermal power generation system includes a molten salt reheater, a high-pressure cylinder, and an intermediate-pressure cylinder. The molten salt reheater extracts a part of the exhaust steam from the high-pressure cylinder and exchanges heat with part of the molten salt in the molten salt reheater, and directly passes the heat-exchanged exhaust steam into the intermediate-pressure cylinder. The molten salt after heat exchange and cooling returns to the low-temperature molten salt storage tank;

[0022] The other-way thermal power generation system includes a second molten salt pump, a molten salt superheater, a molten salt steam generator, a molten salt preheater, and a feed water preheater connected in sequence. The inlet of the molten salt superheater is connected to the outlet of the second molten salt pump, and the molten salt preheater is connected to the outlet of the feed water preheater. When the molten salt in the second molten salt pump passes through the molten salt superheater, the molten salt steam generator, and the molten salt preheater in sequence, the water in the feed water preheater passes through the molten salt preheater, the molten salt steam generator, and the molten salt superheater in sequence. The water in the feed water preheater exchanges heat with the molten salt and becomes steam and enters the high-pressure cylinder. The molten salt after heat exchange and cooling returns to the low-temperature molten salt storage tank.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention provides a system and working method for the low-steam reactive operation of a Carnot battery unit, including a high-pressure cylinder, an intermediate-pressure cylinder, and a low-pressure cylinder. The high-pressure cylinder, the intermediate-pressure cylinder, and the low-pressure cylinder are connected in sequence. In the working state, the blades inside the high-pressure cylinder, the intermediate-pressure cylinder, and the low-pressure cylinder rotate highly, releasing a large amount of heat energy. At this time, cooling steam is respectively introduced into the steam inlet of the high-pressure cylinder, the steam inlet of the intermediate-pressure cylinder, and the steam inlet of the low-pressure cylinder, which can take away the frictional ventilation heat to maintain a relatively stable temperature distribution of the flow passage part, and at the same time avoid blade flutter and water erosion, ensuring the economy and safety of the operation of the Carnot battery unit.

[0025] Furthermore, a heat pump cycle compressor is provided to directly heat the molten salt in the low-temperature molten salt tank. Only a small amount of electric energy needs to be consumed to generate a large amount of heat energy, so its energy efficiency ratio is very high.

[0026] Furthermore, a cooling tower is connected to the condenser, enabling the cooling water to directly flow from the condenser into the cooling tower for heat dissipation and then flow back to the condenser for circulation. Brief Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the operation of the present invention.

[0028] Figure 2 It is a schematic diagram of the Carnot battery system.

[0029] Figure 3 It is a flow chart of the Carnot battery molten salt energy storage power station system.

[0030] Explanation of the reference numerals in the drawings: 1. Low-temperature molten salt storage tank; 2. First molten salt pump; 3. Electric heater; 4. High-temperature molten salt storage tank; 5. Heat pump cycle compressor; 6. Second molten salt pump; 7. Molten salt reheater; 8. Molten salt superheater; 9. Molten salt steam generator; 10. Molten salt preheater; 11. High-pressure cylinder; 12. Intermediate-pressure cylinder; 13. Low-pressure cylinder; 14. Condenser; 15. Cooling tower; 16. Condensate pump; 17. Low-pressure heater system; 18. Deaerator; 19. Feed water pump; 20. High-pressure heater system; 21. Feed water preheater; 22. Carnot battery unit. Detailed Embodiments

[0031] In order to enable those skilled in the art to better understand the solution of the present invention, 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 only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] The detailed embodiments of the present invention are as follows:

[0033] As Figure 1 shown, a low-steam and reactive power operation system for a Carnot battery unit includes a high-pressure cylinder 11, an intermediate-pressure cylinder 12, and a low-pressure cylinder 13, which are connected in sequence. Since the high-speed rotation of the blades in the working state of the steam turbine will cause heat generation inside the cylinder, which may damage the steam turbine, therefore, in the working process of the steam turbine, cooling steam is respectively introduced into the steam inlet of the high-pressure cylinder 11, the steam inlet of the intermediate-pressure cylinder 12, and the steam inlet of the low-pressure cylinder 13. The exhaust steam of the low-pressure cylinder 13 enters the condenser 14, and a part of the cooling steam of the high-pressure cylinder 11 directly enters the intermediate-pressure cylinder 12, and the exhaust steam of the intermediate-pressure cylinder 12 enters the low bypass. By introducing the cooling steam, the heat continuously generated by the drum wind friction inside the cylinder caused by the high-speed rotation of the rotor is taken away, avoiding overheating of the cylinder body and blades, and ensuring the safe operation of the Carnot unit.

[0034] Preferably, the cooling steam can be the auxiliary steam from the adjacent unit outside, or the exhaust steam of the high-pressure cylinder 11 and the exhaust steam of the intermediate-pressure cylinder 12 of this unit.

[0035] Preferably, a vacuum maintenance system for the high-pressure cylinder 11 and the intermediate-pressure cylinder 12 is added. By maintaining the vacuum degree of the high-pressure cylinder 11 and the intermediate-pressure cylinder 12, the energy loss during the operation of the unit can be reduced, the overall efficiency of the unit can be improved, and the damage to other components of the machine body caused by high-temperature and high-pressure gases can be reduced, thereby extending the service life of the unit equipment.

[0036] The following will be further described in detail with specific embodiments and drawings.

[0037] A low-steam and reactive power operation system for a Carnot battery unit has the following composition structure:

[0038] As Figure 2 shown, the Carnot battery unit is composed of three parts: an electric energy to heat system, a thermal energy storage system, and a thermal energy to power system.

[0039] Electric energy to heat system (P2T, Power to Thermal): Electric energy is converted into thermal energy through various technologies, such as resistance heating, heat pump, Rankine cycle, Brayton cycle, etc.

[0040] Thermal energy storage system (TES, Thermal Energy Storage): Thermal energy storage is divided into three types: sensible heat storage, latent heat storage, and thermochemical storage. The storage materials include hot water, molten salt, packed bed rock, liquid air, etc.

[0041] Thermal energy to power system (T2P, Thermal to Power): The stored thermal energy is converted into electric energy through a thermal cycle (such as a heat engine, steam turbine, gas turbine, etc.).

[0042] As Figure 3As shown in the figure, a low-steam and reactive power operation system for a Carnot battery unit includes a Carnot battery unit 22, which works by replacing the boiler. Among them, the electric-to-thermal energy conversion system includes a low-temperature molten salt storage tank 1, which is sequentially connected to a first molten salt pump 2, an electric heater 3, and a high-temperature molten salt storage tank 4. After converting the electric energy of the electric heater 3 into thermal energy, the thermal energy storage system stores the heated molten salt in the high-temperature molten salt storage tank 4. Subsequently, thermal power generation is carried out. The thermal power generation system is divided into two paths for heat exchange. One path of the thermal power generation system exchanges heat with water in the feedwater preheater 21, including a second molten salt pump 6, which is sequentially connected to a molten salt superheater 8, a molten salt steam generator 9, and a molten salt preheater 10. The other path of the thermal power generation system exchanges heat with the extraction steam of the high-pressure cylinder 11, including a second molten salt pump 6 and a molten salt reheater 7.

[0043] Preferably, the outlet of the low-temperature molten salt storage tank 1 can also be directly connected to the inlet of the high-temperature molten salt storage tank 4 through a heat pump cycle compressor 5. The heat pump system itself has the characteristics of high efficiency and energy saving. By optimizing the system design, improving the efficiency of core components, and improving heat exchangers, etc., the energy consumption of the heat pump system can be further reduced. The heat pump system can also improve energy efficiency through waste heat recovery and utilization. For example, in the industrial field, the heat pump system can recover the waste heat generated in the production process and use it for heating or refrigeration and other needs, so as to achieve the cascaded utilization of energy and energy conservation and emission reduction.

[0044] A low-steam and reactive power operation system for a Carnot battery unit includes a high-pressure cylinder 11, an intermediate-pressure cylinder 12, and a low-pressure cylinder 13 connected in sequence. There is one high-pressure cylinder 11 and one intermediate-pressure cylinder 12 each. The low-pressure cylinder 13 consists of two low-pressure cylinders 13. The outlet of the low-pressure cylinder 13 is connected to a condenser 14, the condenser 14 is connected to a cooling tower 15, the outlet of the condenser 14 is connected to the inlet of a condensate pump 16, the outlet of the condensate pump 16 is connected to the inlet of a low-pressure heater system 17, the outlet of the low-pressure heater system 17 is connected to the inlet of a deaerator 18, the outlet of the deaerator 18 is connected to the inlet of a feed pump 19, and the outlet of the feed pump 19 is connected to the inlet of a high-pressure heater system 20. The outlet of the high-pressure heater system 20 is connected to a feedwater preheater 21.

[0045] Preferably, the outlet of the high-pressure cylinder 11 can also be directly connected to the high-pressure heater system 20, which can make full use of waste heat, reduce the loss of energy during transmission, effectively use the high-temperature and high-pressure steam discharged from the high-pressure cylinder 11 for heating, thereby improving the efficiency of the entire thermal system. The system can flexibly adjust the output of the high-pressure cylinder and the heating amount of the high-pressure heater system according to actual needs to achieve the optimal utilization of energy.

[0046] Preferably, the outlet of the intermediate-pressure cylinder 12 can be directly connected to the deaerator 18. The high-temperature and high-pressure steam at the outlet of the intermediate-pressure cylinder directly enters the deaerator, reducing the energy loss during steam transmission, such as pressure drop and temperature drop, thereby improving the efficiency of the entire thermal system. The high-temperature and high-pressure steam provides sufficient heat for the deaerator, helping to more thoroughly remove dissolved oxygen and other non-condensable gases in the water and improving the quality of the feed water.

[0047] Preferably, the low-pressure heater system includes a number of low-pressure heaters, which are connected in sequence for step-by-step heating and finally enter the deaerator. During the heating process, the steam extracted from the steam turbine is used to increase the temperature of the condensate, thereby improving the cycle thermal efficiency and reducing the cold source loss.

[0048] Preferably, the high-pressure heater system includes a number of high-pressure heaters, which are connected in sequence. By using the steam that has already done part of the work in the steam turbine to heat the feed water, the feed water is preheated to a certain temperature before entering the boiler, thereby reducing the inevitable cold source loss during the operation of the steam turbine and improving the thermal efficiency of the cycle.

[0049] A working method of a steam-saving and reactive-power operation system for a Carnot battery unit is as follows:

[0050] As Figures 2-3 shown, in the working state, the molten salt in the low-temperature molten salt storage tank 1 is pumped into the electric heater 3 by the first molten salt pump 2 for heating, converting the electrical energy of the electric heater 3 into heat energy. Subsequently, the molten salt heated during charging is stored in the high-temperature molten salt storage tank 4, completing the storage of electrical energy.

[0051] Preferably, the electric power can directly drive the heat pump cycle compressor 5 to work, compressing the working medium to a high-temperature and high-pressure state. The high-temperature and high-pressure working medium exchanges heat with the molten salt in the high-temperature molten salt storage tank 4, transferring the heat energy of the working medium to the molten salt, realizing the conversion of electrical energy into heat energy.

[0052] The molten salt in the high-temperature molten salt storage tank 4 is pumped out by the second molten salt pump 6 and divided into two streams for heat exchange:

[0053] A stream enters the molten salt superheater 8, the molten salt steam generator 9, and the molten salt preheater 10 to exchange heat with water in the feed water preheater 21. The molten salt superheater 8 further heats the molten salt in the high-temperature molten salt storage tank 4 to a higher temperature, causing its temperature to rise sharply, with a higher thermal energy density and better heat transfer performance. Subsequently, the superheated molten salt is pumped into the molten salt steam generator 9, where the heat released by the high-temperature molten salt is used to generate steam. After releasing heat, the temperature of the molten salt decreases and it enters the molten salt preheater 10 for preheating. While the molten salt is operating, the water in the feed water preheater 21 enters the molten salt preheater 10 to exchange heat with the molten salt in the molten salt preheater 10. Subsequently, the feed water enters the molten salt steam generator 9 to exchange heat with the high-temperature molten salt in the molten salt steam generator 9, transferring the heat of the molten salt to the feed water. After absorbing heat, the feed water gradually heats up and vaporizes, finally generating steam. The generated steam enters the molten salt superheater 8 for further heating and finally enters the high-pressure cylinder 11 in the form of steam to complete the water heat exchange process. After heat exchange and cooling, the molten salt returns to the low-temperature molten salt storage tank 1 for recycling;

[0054] Another stream enters the molten salt reheater 7 to exchange heat with steam in the high-pressure cylinder 11 and the intermediate-pressure cylinder 12. The molten salt reheater 7 extracts a part of the exhaust steam from the high-pressure cylinder 11 and exchanges heat with the molten salt in the molten salt reheater 7, exchanging the heat of the molten salt with a part of the exhaust steam from the high-pressure cylinder 11. The exhaust steam after heat exchange is directly introduced into the intermediate-pressure cylinder 12 to complete the extraction steam heat exchange process. After heat exchange and cooling, the molten salt returns to the low-temperature molten salt storage tank 1 for recycling;

[0055] Furthermore, another part of the exhaust steam from the high-pressure cylinder 11 enters the intermediate-pressure cylinder 12 to perform work and exhaust steam. The low-pressure cylinder 13 receives a part of the steam from the intermediate-pressure cylinder 12 to expand and do work, and discharges the expanded steam into the condenser 14. The condenser 14 condenses the steam discharged from the low-pressure cylinder 13 into water. The cooling tower 15 can exchange heat with the condenser 14 during this process to further reduce the temperature of the condensed water. The condenser 14 boosts the pressure of the condensed water in the condensate pump 16. The condensed water after pressure boosting is gradually heated through the low-pressure heater system 17 and then enters the deaerator 18 to remove the oxygen in the water to ensure the quality of the feed water. After the feed water enters the deaerator 18, it mixes with the steam from the intermediate-pressure cylinder 12 and forms an atomized state through the nozzle, increasing the contact area between the water and the steam and improving the heat transfer efficiency. Under the action of high temperature and pressure, the oxygen in the water is gradually separated out and discharged through the exhaust pipe. The water after deaeration enters the high-pressure heater system 20 for gradual heating and is finally sent into the feed water preheater 21. The feed water preheater 21 enters the molten salt preheater 10 to perform water heat exchange again, and so on in a cycle.

[0056] Preferably, the exhaust steam in the high-pressure cylinder 11 can also be directly discharged into the high-pressure heater system 20 for subsequent water heat exchange process.

[0057] Finally, it should be noted that the above has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claimed invention.

[0058] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A Carnot battery unit low steam reactive operation system, characterized in that: The invention comprises a high-pressure cylinder (11), a medium-pressure cylinder (12) and a low-pressure cylinder (13), wherein the high-pressure cylinder (11), the medium-pressure cylinder (12) and the low-pressure cylinder (13) are connected in sequence, and cooling steam is respectively introduced into the steam inlet of the high-pressure cylinder (11), the steam inlet of the medium-pressure cylinder (12) and the steam inlet of the low-pressure cylinder (13).

2. According to claim 1, a Carnot battery unit with less steam and reactive power and three cylinders in series operation system is characterized in that: The cooling steam comes from one or more combinations of external auxiliary steam, exhaust steam from the high-pressure cylinder (11) and exhaust steam from the medium-pressure cylinder (12).

3. According to claim 1, a Carnot battery unit low steam reactive operation system is characterized in that: The invention comprises a Carnot battery unit (22), wherein the Carnot battery unit (22) comprises: The electric energy heat conversion system comprises an electric heater (3) and is used to convert the electric energy of the electric heater (3) into heat energy; Thermal energy storage system: connected to the electric energy to heat conversion system, used to store the thermal energy converted from electric energy; Thermal energy power generation system: connected to the thermal energy storage system, used to convert the stored thermal energy into steam and pass it into the high-pressure cylinder (11), the medium-pressure cylinder (12) and the low-pressure cylinder (13) to drive the generator to generate electricity.

4. A Carnot battery unit low steam reactive operation system according to claim 3, characterized in that: The electric energy heat conversion system comprises a low-temperature molten salt storage tank (1), the outlet of the low-temperature molten salt storage tank (1) is connected to the inlet of a first molten salt pump (2), the outlet of the first molten salt pump (2) is connected to the inlet of an electric heater (3), and the outlet of the electric heater (3) is connected to the inlet of a high-temperature molten salt storage tank (4).

5. A Carnot battery unit low steam reactive operation system according to claim 4, characterized in that: The electric energy heat conversion system comprises a heat pump circulation compressor (5), the inlet of the heat pump circulation compressor (5) is connected to a low-temperature molten salt storage tank (1), and the outlet is connected to a high-temperature molten salt storage tank (4).

6. A Carnot battery unit low steam reactive operation system according to claim 4, characterized in that: The thermal power generation system comprises a second molten salt pump (6), the inlet of the second molten salt pump (6) is connected to the outlet of the high-temperature molten salt storage tank (4), the molten salt in the high-temperature molten salt storage tank (4) is divided into two paths for heat exchange after passing through the second molten salt pump (6), the working fluid after heat exchange is respectively sent to the high-pressure cylinder (11) and the medium-pressure cylinder (12), and the molten salt after heat exchange and temperature reduction is returned to the low-temperature molten salt storage tank (1).

7. A Carnot battery unit low steam reactive operation system according to claim 6, characterized in that: The outlet of the high-pressure cylinder (11) is connected to the inlet of the medium-pressure cylinder (12), the outlet of the medium-pressure cylinder (12) is connected to the inlet of the low-pressure cylinder (13), the outlet of the low-pressure cylinder (13) is connected to the inlet of the condenser (14), the outlet of the condenser (14) is connected to the inlet of the condensate pump (16), the outlet of the condensate pump (16) is connected to the inlet of the low-pressure heating system (17), the outlet of the low-pressure heating system (17) is connected to the inlet of the deaerator (18), the outlet of the medium-pressure cylinder (12) is connected to the inlet of the deaerator (18), the outlet of the deaerator (18) is connected to the inlet of the feed water pump (19), the outlet of the feed water pump (19) is connected to the inlet of the high-pressure heating system (20), the outlet of the high-pressure heating system (20) is connected to the inlet of the feed water preheater (21), and the outlet of the feed water preheater (21) is connected to the thermal power generation system to perform a water heat exchange process; It comprises a cooling tower (15), and the cooling tower (15) is connected to the condenser (14).

8. A Carnot battery unit low steam reactive operation system according to claim 7, characterized in that: The thermal power generation system comprises a molten salt superheater (8), a molten salt steam generator (9) and a molten salt preheater (10) which are connected in sequence, wherein the inlet of the molten salt superheater (8) is connected to the outlet of the second molten salt pump (6), and the molten salt preheater (10) is connected to the outlet of the feed water preheater (21).

9. A working method of a Carnot battery unit low steam reactive operation system, characterized in that: Cooling steam is introduced into the steam inlet of the high-pressure cylinder (11), the steam inlet of the medium-pressure cylinder (12) and the steam inlet of the low-pressure cylinder (13) respectively to reduce the temperature inside the cylinders.

10. The working method of a Carnot battery unit low steam reactive operation system according to claim 9, characterized in that: A thermal energy power generation system comprising a low-temperature molten salt storage tank (1) and a Carnot battery unit (22) performs two-way heat exchange, wherein one path of the thermal energy power generation system comprises a molten salt reheater (7), a high-pressure cylinder (11) and a medium-pressure cylinder (12), wherein the molten salt reheater (7) extracts a portion of the exhaust steam of the high-pressure cylinder (11) and performs heat exchange with the molten salt in the molten salt reheater (7), and the exhaust steam after heat exchange is directly passed into the medium-pressure cylinder (12), and the molten salt cooled by heat exchange is returned to the low-temperature molten salt storage tank (1); Another thermal energy power generation system comprises a second molten salt pump (6), a molten salt superheater (8), a molten salt steam generator (9), a molten salt preheater (10) and a feed water preheater (21) which are connected in sequence. The inlet of the molten salt superheater (8) is connected to the outlet of the second molten salt pump (6), and the molten salt preheater (10) is connected to the outlet of the feed water preheater (21). When the molten salt in the second molten salt pump (6) passes through the molten salt superheater (8), the molten salt steam generator (9) and the molten salt preheater (10) in sequence, the water in the feed water preheater (21) passes through the molten salt preheater (10), the molten salt steam generator (9) and the molten salt superheater (8) in sequence. After the water in the feed water preheater (21) exchanges heat with the molten salt, it becomes water vapor and enters the high-pressure cylinder (11). After heat exchange and cooling, the molten salt returns to the low-temperature molten salt storage tank (1).

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