Low-steam reactive three-cylinder series operation system of Carnot battery unit and working method

Abstract

The invention belongs to the technical field of Carnot battery energy storage, and particularly relates to a low-steam reactive three-cylinder series operation system of a Carnot battery unit and a working method of the low-steam reactive three-cylinder series operation system. Comprising a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder which are sequentially connected, in the working state, blades in the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder rotate highly and release a large amount of heat energy, cooling steam is introduced into the high-pressure cylinder at the moment, the cooling steam sequentially flows through the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder, and the cooling steam is cooled. 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 in particular relates to a Carnot battery unit low-steam reactive three-cylinder series operation system and a working method. Background Art

[0002] The Carnot battery refers to a large-scale electric energy storage system based on heat storage. During the charging stage, electrical energy is converted into thermal energy and stored in a certain form; during the discharging stage, thermal energy is converted into electrical energy for reuse. It is an emerging electric energy storage technology that can achieve medium to large-scale electric energy storage at low cost and without geographical restrictions. The system's energy storage scale can be as high as 100MW / 1000MWh. It is expected to solve the renewable energy storage problem facing the world and 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: electricity to heat conversion, thermal energy storage, and thermal energy generation. It can be used as grid energy storage, storing excess electricity from variable renewable energy sources, and generating electricity when needed. Carnot battery technology developed based on molten salt energy storage technology is mainly used to build independent molten salt energy storage power stations and renovate retired units. Carnot batteries are used to completely replace boilers for renovation, that is, on the basis of existing units, the boilers and their ancillary equipment are dismantled or bypassed as a whole, and a new molten salt heat storage system is built, which is combined with the thermal system of the existing units to form a Carnot battery molten salt energy storage power station. Converting thermal power units into Carnot battery molten salt energy storage power stations can not only retain most of the current thermal power station equipment and assets, but also will not cause a large number of people to lose their jobs in a short period of 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 continued reuse of retired units in the future.

[0004] The operation of the steam turbine is intermittent. When the clearing price is high, the steam turbine generates electricity, and when the clearing price is low, it only stores heat in the molten salt. If the steam turbine is shut down during energy storage, on the one hand, it cannot cope with the alternating operation and shutdown conditions in a short period of time. On the other hand, when the shutdown time is long, the startup time will also be long, and the startup requires warm-up, flushing and other energy consumption. Most of the stored heat is used for startup, and the overall utilization efficiency of the system is low. Therefore, in order to improve the utilization rate of energy storage, it is necessary to put the steam turbine in a high-speed rotation state and hot standby state during the energy storage stage.

[0005] The steam turbine is in low steam and reactive operation when the steam turbine unit is in the grid-connected state and needs a small amount of grid power to drive the unit to rotate. At this time, the generator is in motor mode and supplies a large amount of reactive power to the grid to solve the problem of voltage increase caused by the lack of reactive power in the low power consumption of the grid. When the steam turbine is in low steam and reactive operation, the steam turbine generator set is connected to the power system as a synchronous phase regulator. At this time, the steam turbine maintains 3000r / min operation and the rotor is in a high-speed rotation state. The internal heat generated by the blast friction inside the cylinder will inevitably increase the internal temperature of the cylinder, resulting in overheating of the cylinder 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 and the blades of the 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 Carnot battery unit low-steam reactive three-cylinder series operation system and working method.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A Carnot battery unit low-steam reactive three-cylinder series operation system comprises a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder, wherein the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder are connected in sequence, and cooling steam is introduced into the high-pressure cylinder.

[0009] The cooling steam comes from one or more combinations of external auxiliary steam, high-pressure cylinder exhaust steam and medium-pressure cylinder exhaust steam.

[0010] Including Carnot battery unit, Carnot battery unit includes:

[0011] Electric energy to heat system: including an electric heater, used to convert the electric energy of the electric heater into heat energy;

[0012] Thermal energy storage system: connected to the electric energy to heat conversion system, used to store the thermal energy converted from electric energy;

[0013] Thermal 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, medium-pressure cylinder and low-pressure cylinder to drive the generator to generate electricity.

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

[0015] The electric energy heat conversion system comprises a heat pump circulation compressor, the inlet of the heat pump circulation compressor is connected to a low-temperature molten salt storage tank, and the outlet is connected to a 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 for heat exchange after passing through the second molten salt pump, and the working fluid after heat exchange is sent to the high-pressure cylinder and the medium-pressure cylinder respectively, and 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 medium-pressure cylinder, the outlet of the medium-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 heating system, the outlet of the low-pressure heating system is connected to the inlet of the deaerator, the outlet of the medium-pressure cylinder is connected to the inlet of the deaerator, the outlet of the deaerator is connected to the inlet of the feedwater pump, the outlet of the feedwater pump is connected to the inlet of the high-pressure heating system, the outlet of the high-pressure heating system is connected to the inlet of the feedwater preheater, and the outlet of the feedwater preheater is connected to the thermal power generation system to perform a water heat exchange process;

[0018] A cooling tower is included, 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 which are 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 three-cylinder series operation system of a Carnot battery unit with less steam and reactive power, wherein cooling steam is introduced into a high-pressure cylinder, and the condensed steam flows through the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder in sequence to cool the inside of the cylinder;

[0021] The thermal power generation system of the Carnot battery unit performs two-way heat exchange. One-way thermal power generation system includes a molten salt reheater, a high-pressure cylinder and a medium-pressure cylinder. The molten salt reheater extracts part of the exhaust steam from the high-pressure cylinder and exchanges heat with part of the molten salt in the molten salt reheater. The exhaust steam after heat exchange is directly passed into the medium-pressure cylinder, and the molten salt cooled by heat exchange returns to the low-temperature molten salt storage tank.

[0022] Another thermal energy 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 which are 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 to become water vapor and enters the high-pressure cylinder. The molten salt cooled by heat exchange 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 Carnot battery unit low-steam reactive three-cylinder series operation system, comprising a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder, wherein the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder are connected in sequence, and in a working state, the blades inside the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder rotate highly, releasing a large amount of heat energy, at which time cooling steam is introduced into the high-pressure cylinder, and the cooling steam flows through the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder in sequence, and can take away the friction blast heat to maintain a relatively stable temperature distribution of the flow-through part, while avoiding flutter and water erosion of the blades, thereby ensuring the economy and safety of the operation of the Carnot battery unit.

[0025] Furthermore, a heat pump circulation compressor is set to directly heat the molten salt in the low-temperature molten salt tank, which only consumes a small amount of electricity to generate a large amount of heat energy, so its energy efficiency ratio is very high.

[0026] Furthermore, the cooling tower is connected to the condenser, so that cooling water can flow directly 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 This is a schematic diagram of three cylinders running in series.

[0028] Figure 2 Schematic diagram of the Carnot battery system.

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

[0030] Explanation of the reference numerals in the figure: 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 circulation 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. Medium-pressure cylinder; 13. Low-pressure cylinder; 14. Condenser; 15. Cooling tower; 16. Condensate pump; 17. Low-pressure heating system; 18. Deaerator; 19. Feed water pump; 20. High-pressure heating system; 21. Feed water preheater; 22. Carnot battery unit. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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 part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0032] The specific implementation of the present invention is as follows:

[0033] like Figure 1 As shown, a Carnot battery unit low steam reactive three-cylinder series operation system includes a high-pressure cylinder 11, a medium-pressure cylinder 12 and a low-pressure cylinder 13, and the high-pressure cylinder 11, the medium-pressure cylinder 12 and the low-pressure cylinder 13 are connected in sequence. Since the high-speed rotation of the blades of the steam turbine in the working state will cause heat to be generated inside the cylinder, thereby causing damage to the steam turbine, therefore, the present invention introduces cooling steam into the inlet of the high-pressure cylinder 11 during the operation of the steam turbine, and the cooling steam flows through the high-pressure cylinder 11, the medium-pressure cylinder 12 and the low-pressure cylinder 13 in sequence, and the exhaust steam of the low-pressure cylinder 13 enters the condenser 14, and part of the cooling steam of the high-pressure cylinder 11 directly enters the medium-pressure cylinder 12, and the other part of the cooling steam is introduced into the molten salt reheater 7. By introducing cooling steam, the heat continuously generated by the blast friction inside the cylinder caused by the high-speed rotation of the rotor is taken away, the cylinder body and the blades are prevented from overheating, and the safe operation of the Carnot unit is ensured.

[0034] Preferably, the cooling steam may be auxiliary steam from the outside, or exhaust steam from the high-pressure cylinder 11 and the medium-pressure cylinder 12 of the machine, preferably the exhaust steam from the high-pressure cylinder and the medium-pressure cylinder of the machine.

[0035] The following is a further detailed description with reference to specific embodiments and drawings.

[0036] A Carnot battery unit with less steam and reactive power and three cylinders in series operation system, the composition structure of which is as follows:

[0037] like Figure 2 As shown, the Carnot battery unit consists of three parts: an electric energy to heat conversion system, a thermal energy storage system, and a thermal energy power generation system.

[0038] Power to Thermal (P2T) system: Electrical energy is converted into thermal energy through various technologies, such as resistance heating, heat pump, Rankine cycle, Brayton cycle, etc.

[0039] Thermal Energy Storage System (TES): Thermal energy storage is divided into three types: sensible heat storage, latent heat storage and thermochemical storage. Storage materials include hot water, molten salt, packed bed rock, liquid air, etc.

[0040] Thermal power generation system (T2P, Thermal to Power): Stored thermal energy is converted into electrical energy through thermodynamic cycles (such as heat engines, steam turbines, gas turbines, etc.).

[0041] like Figure 3As shown, a Carnot battery unit low-steam reactive three-cylinder series operation system includes a Carnot battery unit 22, and the Carnot battery unit 22 is used to replace the boiler for operation, wherein the electric energy heat conversion system includes a low-temperature molten salt storage tank 1, and the low-temperature molten salt storage tank 1 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; then thermal energy power generation is performed, and the thermal energy power generation system is divided into two paths for heat exchange, one thermal energy power generation system performs water heat exchange with a feed water 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 thermal energy power generation system performs steam extraction heat exchange with part of the high-pressure cylinder 11, including a second molten salt pump 6 and a molten salt reheater 7;

[0042] 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 the heat pump circulation compressor 5, and the heat pump system itself has the characteristics of high efficiency and energy saving. The energy consumption of the heat pump system can be further reduced by optimizing the system design, improving the efficiency of core components, improving the heat exchanger, etc. The heat pump system can also improve energy efficiency by recovering and utilizing waste heat. 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 cooling needs, thereby realizing the cascade utilization of energy and energy conservation and emission reduction.

[0043] A Carnot battery unit with three cylinders in series for low steam and reactive power operation comprises a high pressure cylinder 11, a medium pressure cylinder 12 and a low pressure cylinder 13 connected in sequence, wherein the high pressure cylinder 11 and the medium pressure cylinder 12 are one each, and the low pressure cylinder 13 is composed 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 an inlet of a condensate pump 16, the outlet of the condensate pump 16 is connected to an inlet of a low pressure heating system 17, the outlet of the low pressure heating system 17 is connected to an inlet of a deaerator 18, the outlet of the deaerator 18 is connected to an inlet of a feed water pump 19, the outlet of the feed water pump 19 is connected to an inlet of a high pressure heating system 20, and the outlet of the high pressure heating system 20 is connected to a feed water preheater 21.

[0044] Preferably, the outlet of the high-pressure cylinder 11 can also be directly connected to the high-pressure heating system 20, which can make full use of waste heat, reduce energy loss during transmission, and 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 heating system according to actual needs to achieve optimal utilization of energy.

[0045] Preferably, the outlet of the intermediate pressure cylinder 12 can be directly connected to the deaerator 18, and the high-temperature and high-pressure steam at the outlet of the intermediate pressure cylinder directly enters the deaerator, reducing the energy loss of steam during 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, which helps to more thoroughly remove dissolved oxygen and other non-condensable gases in the water, thereby improving the quality of the feed water.

[0046] Preferably, the low-pressure heating system includes a plurality of low-pressure heaters, which are connected in sequence to perform step-by-step heating and finally enter the deaerator. During the heating process, the steam turbine is used to extract steam to increase the temperature of the condensed water, thereby improving the cycle thermal efficiency and reducing the loss of the cold source.

[0047] Preferably, the high-pressure heating system includes several high-pressure heaters, which are connected in sequence. The feed water is heated by utilizing the steam that has done partial work in the steam turbine, so that the feed water is heated 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.

[0048] A working method of a Carnot battery unit low steam reactive series operation system is as follows:

[0049] like Figures 2-3 As shown, in the working state, the molten salt in the low-temperature molten salt storage tank 1 is sent to the electric heater 3 for heating through the first molten salt pump 2, and the electric energy of the electric heater 3 is converted into thermal energy. Then, the molten salt that has been charged and heated is stored in the high-temperature molten salt storage tank 4, completing the storage of electric energy;

[0050] Preferably, electricity can directly drive the heat pump circulation compressor 5 to work, compressing the working fluid to a high temperature and high pressure state. The high temperature and high pressure working fluid exchanges heat with the molten salt in the high temperature molten salt storage tank 4, transferring the heat of the working fluid to the molten salt, thereby realizing the conversion of electrical energy into thermal energy.

[0051] The molten salt in the high-temperature molten salt storage tank 4 is pumped out by the second molten salt pump 6 and is divided into two streams for heat exchange:

[0052] One stream enters the molten salt superheater 8, the molten salt steam generator 9 and the molten salt preheater 10 to perform a water heat exchange process with 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. The superheated molten salt is then pumped into the molten salt steam generator 9, and the heat released by the high-temperature molten salt is used to generate steam. After the heat is released, the temperature of the molten salt decreases and enters the molten salt preheater 10 for preheating. While the molten salt is working, the feed water preheater The water in the heater 21 enters the molten salt preheater 10, exchanges heat with the molten salt in the molten salt preheater 10, and then the feed water enters the molten salt steam generator 9, exchanges heat with the high-temperature molten salt in the molten salt steam generator 9, and transfers the heat of the molten salt to the water. After absorbing the heat, the feed water gradually heats up and vaporizes, and finally generates 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, completing the water heat exchange process. After heat exchange and cooling, the molten salt returns to the low-temperature molten salt storage tank 1 for recirculation;

[0053] The other stream enters the molten salt reheater 7 to exchange steam with the high-pressure cylinder 11 and the medium-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. The heat of the molten salt is exchanged with part of the exhaust steam from the high-pressure cylinder 11. The exhaust steam after heat exchange is directly passed into the medium-pressure cylinder 12 to complete the steam extraction and heat exchange process. The molten salt cooled by heat exchange returns to the low-temperature molten salt storage tank 1 for recirculation.

[0054] Furthermore, another part of the exhaust steam of the high-pressure cylinder 11 enters the intermediate-pressure cylinder 12, performs work and exhausts steam in the intermediate-pressure cylinder 12, and the low-pressure cylinder 13 receives part of the steam of the intermediate-pressure cylinder 12 to expand and perform work, and discharges the expanded steam into the condenser 14, and 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 in this process to further reduce the temperature of the condensed water, and the condenser 14 increases the pressure of the condensed water in the condensate pump 16, and the pressurized condensed water passes through the low-pressure heating system 17 for step-by-step cooling. After heating, the water enters the deaerator 18 to remove oxygen from the water to ensure the quality of the feed water. After the feed water enters the deaerator 18, it is mixed with the steam from the medium-pressure cylinder 12 and atomized through a nozzle to increase the contact area between water and steam and improve the heat transfer efficiency. Under the action of high temperature and pressure, the oxygen in the water is gradually precipitated and discharged through the exhaust pipe. The deoxygenated water enters the high-pressure heating system 20 for step-by-step heating and is finally sent to the feed water preheater 21. The feed water preheater 21 enters the molten salt preheater 10 for water heat exchange again, and the cycle repeats.

[0055] Preferably, the exhaust steam in the high-pressure cylinder 11 can also be directly discharged into the high-pressure heating system 20 for subsequent water heat exchange process.

[0056] Finally, it should be noted that the above shows and describes the basic principles and main features of the present invention and the 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 the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0057] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of 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 implementation modes 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 changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A Carnot battery unit with three cylinders in series with less steam and reactive power, 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 introduced into the high-pressure cylinder (11).

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 with less steam and reactive power and three cylinders in series 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. According to claim 3, a Carnot battery unit with less steam and reactive power and three cylinders in series operation system is 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 three cylinder series 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 three cylinder series 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 three cylinder series 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 three cylinder series 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 with three-cylinder series operation system with less steam and reactive power, characterized in that: Cooling steam is introduced into the high-pressure cylinder (11), and the condensed steam flows through the high-pressure cylinder (11), the medium-pressure cylinder (12) and the low-pressure cylinder (13) in sequence, thereby cooling the interior of the cylinder.

10. The working method of a Carnot battery unit low-steam reactive three-cylinder series 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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