Thermal power plant electric energy storage deep adjustment peak system

Abstract

The utility model belongs to the technical field of thermal power plant peak regulation, and particularly provides a thermal power plant electric energy storage deep peak regulation system which comprises an electric heat storage boiler (13) provided with a shell, an electric heater, a plurality of solid heat storage pieces, a heat exchange air duct and a heat exchanger. The electric heater is arranged in the solid heat storage piece and is electrically connected with the generator (6); the heat exchange air duct is arranged among the plurality of solid heat storage pieces; the heat release end of the heat exchanger is communicated with the heat exchange air duct, the heat absorption end inlet is communicated with a water supply pipeline (19) of the electric heat storage boiler, and the heat absorption end outlet is communicated with the power station boiler (1) or the main steam turbine. According to the electric energy storage deep adjustment peak system of the thermal power plant, part of electric energy produced by the generator can be stored as heat energy through the electric heat storage boiler (13) in the deep adjustment or spot low ebb period, and steam is prepared through the stored heat energy and provided for the power station boiler (1) or the main steam turbine in the load demand peak period; and the method is suitable for peak regulation and peak operation.

Description

Technical Field

[0001] This application belongs to the technical field of peak shaving in thermal power plants, and particularly relates to a deep peak shaving system for thermal power plant energy storage. Background Technology

[0002] Currently, China's installed coal-fired power capacity is approximately 1.1 billion kilowatts, serving as a supporting and fundamental power source for the country's power system. Under the goal of peak carbon emissions, carbon emission constraints are increasingly tightening, leaving very limited room for the development of coal-fired power capacity. Meanwhile, my country's electricity demand continues to grow at a moderate pace, with annual increases in electricity generation exceeding 300 billion kilowatt-hours and annual increases in electricity load exceeding 50 million kilowatts. Due to the intermittent and volatile nature of new energy sources such as wind and solar power, a stable power supply cannot be achieved. Since 2020, many regions have experienced power shortages during peak consumption periods, resulting in "power rationing" and affecting the normal operation of the economy and society. At the same time, influenced by my country's industrial restructuring and urbanization, the peak-valley difference in electricity consumption has further widened. Traditional thermal power plants' main steam turbine units are primarily used for power generation and for extracting steam from the main turbine for external supply. While the demand for steam from external users is relatively stable, during peak electricity consumption periods, external steam supply is still necessary, and the power plant boilers cannot meet the increased load (peak) demand of the main steam turbine. Utility Model Content

[0003] In existing thermal power plants, steam needs to be supplied to external sources during peak electricity demand periods, but the power plant boilers cannot meet the increased load (peak) demand of the main steam turbine.

[0004] To address the aforementioned technical problems, according to some embodiments, this application provides a deep-shaving peak-shaving system for thermal power plants. The thermal power plant includes a power plant boiler, a main steam turbine, and a generator. The power plant boiler is equipped with a reheater, which heats the exhaust steam from the high-pressure cylinder of the main steam turbine and provides the heated reheated steam to the intermediate-pressure cylinder of the main steam turbine. The system includes:

[0005] An electric thermal storage boiler includes a shell and an electric heater, multiple solid thermal storage components, a heat exchange duct, and a heat exchanger disposed inside the shell.

[0006] The heating element of the electric heater is located inside the solid heat storage component, and the heating element may be a heating tube; the heating element is electrically connected to the generator and can be driven by the generator to generate heat.

[0007] The solid heat storage component is filled with solid heat storage material.

[0008] The heat exchange duct is disposed between the plurality of solid heat storage components and is connected to the heat dissipation end of the heat exchanger;

[0009] The heat exchanger is located on one side of the plurality of solid heat storage members, the heat releasing end of the heat exchanger is communicated with the heat exchange air duct, the heat absorbing end inlet of the heat exchanger is communicated with the water supply pipeline of the electric heat storage boiler, and the heat absorbing end outlet of the heat exchanger is communicated with the power station boiler or the main steam turbine.

[0010] Further, the water supply pipeline of the electric heat storage boiler is communicated with the condensate water pipeline downstream of the main steam turbine.

[0011] The heat absorbing end outlet of the heat exchanger is connected to the cold section and / or the hot section of the reheater.

[0012] The electric heat storage boiler is connected to the output end of the generator or the booster station of the thermal power plant.

[0013] Further, the heat exchanger is a multi-stage heat exchanger; or, the heat exchanger comprises a plurality of sub-heat exchangers.

[0014] Further, the plurality of sub-heat exchangers comprises a first heat exchanger and a second heat exchanger.

[0015] The plurality of solid heat storage members comprises a plurality of first solid heat storage members and a plurality of second solid heat storage members, the plurality of first solid heat storage members is provided with a first heat exchange air duct, and the plurality of second solid heat storage members is provided with a second heat exchange air duct.

[0016] The heat releasing end of the first heat exchanger is communicated with the first heat exchange air duct, the heat absorbing end inlet of the first heat exchanger is communicated with the water supply pipeline of the electric heat storage boiler,

[0017] The heat releasing end of the second heat exchanger is communicated with the second heat exchange air duct, the heat absorbing end inlet of the second heat exchanger is communicated with the heat absorbing end outlet of the first heat exchanger, and the heat absorbing end outlet of the second heat exchanger is communicated with the cold section and / or the hot section of the reheater.

[0018] Further, a steam drum is arranged between the heat absorbing end outlet of the first heat exchanger and the heat absorbing end inlet of the second heat exchanger.

[0019] The steam inlet of the steam drum is communicated with the heat absorbing end outlet of the first heat exchanger, the steam outlet of the steam drum is communicated with the heat absorbing end inlet of the second heat exchanger, the water outlet at the bottom of the steam drum is communicated with the heat absorbing end of the first heat exchanger, and the upper water pipeline of the steam drum is communicated with the condensate water pipeline.

[0020] Further, the heat absorbing end outlet of the second heat exchanger is also communicated with one end of a unit start-up steam pipeline, and the other end of the start-up steam pipeline is communicated with a steam inlet of a thermal power unit start-up.

[0021] The heat absorbing end outlet of the second heat exchanger is also communicated with an industrial steam supply pipeline.

[0022] Further, the condensate water pipeline is arranged between the low-pressure cylinder steam outlet and the water inlet of the power plant boiler, and a condenser, a condensate pump, a low-pressure heater, a deaerator, a main feed water pump and a high-pressure heater are sequentially arranged on the condensate water pipeline;

[0023] The water supply pipeline of the electric heat storage boiler is connected with the condensate water pipeline downstream of the deaerator, and a water supply pump is arranged on the water supply pipeline of the electric heat storage boiler.

[0024] Further, when the electric load demand is low, part of the electric energy of the thermal power unit is used to drive the electric heat storage boiler to convert the electric energy into heat energy for storage;

[0025] When the electric load demand is high, the electric heat storage boiler uses the stored heat energy to prepare steam for the power plant boiler or the main steam turbine.

[0026] Further, when the power plant boiler is restarted after being stopped, the electric heat storage boiler prepares steam as a starting steam source.

[0027] Further, the system further comprises a desalted water pipeline, one end of which is connected with the water supply pipeline of the electric heat storage boiler and the water supply pipeline, and the other end of which is connected with an external water source.

[0028] When the power plant boiler is stopped, the desalted water pipeline supplies water to the electric heat storage boiler and the steam drum.

[0029] The above technical scheme of the utility model has at least the following beneficial technical effects:

[0030] The thermal power plant electric energy storage deep regulation peak system of the application can store part of the electric energy produced by the generator of the thermal power plant as heat energy through the electric heat storage boiler during the deep regulation or spot low valley period, and can use the stored heat energy to heat the water supply to prepare steam for the power plant boiler or the main steam turbine during the high load demand peak period, so that the waste of abandoned electricity of the thermal power plant is reduced and the system is suitable for peak regulation and peak operation. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0032] Figure 1 is a structural schematic view of the thermal power plant electric energy storage deep regulation peak system in an embodiment of the application.

[0033] Among them, Figure 1 The correspondence between the reference signs and the component names in the drawings is as follows:

[0034] 1. boiler; 2. reheater; 3. high pressure cylinder; 4. intermediate pressure cylinder; 5. low pressure cylinder; 6. generator; 7. condenser; 8. condensate pump; 9. low pressure heater; 10. deaerator; 11. main feed water pump; 12. high pressure heater extraction heat; 13. electric heat storage boiler; 14. first heat exchanger; 15. second heat exchanger; 16. steam drum; 17. feed water pump.

[0035] 18. desalted water pipeline; 181. first valve group; 19. feed water pipeline of electric heat storage boiler; 191. second valve group; 20. water supply pipeline; 201. third valve group; 21. reserve steam pipeline; 211. fourth valve group; 22. start-up steam pipeline; 221. fifth valve group; 23. industrial steam supply pipeline; 231. sixth valve group. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the embodiments of the present application, many technical details are presented in order to make the readers better understand the present application. However, the technical solutions claimed by the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the following embodiments is for the convenience of description, and should not constitute any limitation on the specific implementation of the present application. The embodiments can be combined with each other and cited to each other on the premise of not being contradictory.

[0037] An embodiment of the present application provides a thermal power plant electric energy storage deep regulation peak shaving system, wherein the thermal power plant can be a traditional thermal power plant burning coal, gas or biomass to generate electricity. The thermal power plant has a boiler 1, a main steam turbine and a generator 6, and the main steam turbine has a high pressure cylinder 3, an intermediate pressure cylinder 4 and a low pressure cylinder 5. The boiler 1 is provided with a reheater 2, and the reheater 2 is used to heat the steam discharged by the high pressure cylinder 3 of the main steam turbine (reheater 2 cold section input) and provide the reheated steam (reheater 2 hot section output) obtained by heating to the intermediate pressure cylinder 4 of the main steam turbine. The system specifically comprises:

[0038] An electric heat storage boiler 13 has a shell, an electric heater, a plurality of solid heat storage members, a heat exchange air duct and a heat exchanger arranged in the shell.

[0039] The heating part of the electric heater is arranged in the solid heat storage member, and the heating part can be a heating pipe. The heating part is electrically connected to the generator 6, and can generate heat by using the electric energy generated by the generator 6. The solid heat storage member is filled with solid heat storage material, and the solid heat storage material stores heat energy after being heated by the heater.

[0040] The heat exchange air duct is arranged between the plurality of solid heat storage members and is in communication with the heat releasing end of the heat exchanger.

[0041] The heat exchanger is located on one side of multiple solid heat storage components. Its heat dissipation end is connected to the heat exchange duct, its heat absorption end inlet is connected to the water supply pipeline of the electric thermal storage boiler, and its heat absorption end outlet is connected to the power plant boiler 1 or the main steam turbine. The heat exchanger does not directly contact the solid heat storage components or the solid heat storage material inside them, but instead exchanges heat with the hot air from the heat exchange duct to produce steam, thus avoiding contact between electricity and steam.

[0042] This application discloses a thermal power plant energy storage deep-shaving and peak-shaving system. During deep-shaving or spot low-price periods (related to real-time electricity prices), the system uses an electric thermal storage boiler 13 to store a portion of the electrical energy produced by the thermal power plant generator 6 as thermal energy. During peak load periods, the stored thermal energy is used to heat water supply to produce steam and supply it to the power plant boiler 1 or main steam turbine, thereby reducing the waste of electricity curtailed by the thermal power plant or power grid and making it suitable for peak-shaving and peak-shaving operations.

[0043] In one specific embodiment of this application, the water supply pipeline 19 of the electric thermal storage boiler is connected to the condensate pipeline downstream of the main steam turbine, and the condensate after the main steam turbine generates electricity is used as the water supply; a second valve group 191 is provided on the water supply pipeline 19 of the electric thermal storage boiler.

[0044] Preferably, the heat exchanger's absorber outlet is connected to the cold section and / or hot section of the reheater 2; the system can supply the steam generated by the heat exchanger to the cold section or hot section of the reheater 2 according to the temperature and pressure of the steam.

[0045] Preferably, the electric thermal storage boiler 13 is electrically connected to the output terminal of the generator 6 or the booster station of the thermal power plant. The electric thermal storage boiler 13 can also be electrically connected to an external power generation system or an external power grid. The external power generation system can be a wind power, hydropower, photovoltaic power generation system, etc., that is, the electric thermal storage boiler 13 stores the surplus electrical energy of the external power generation system as thermal energy.

[0046] Ideally, the heating element of the electric heater can be a heating tube, which serves as a protective layer and contains a resistance wire inside. The resistance wire is covered with a ceramic coating, which provides electrical insulation. The heating tube can be made of a nickel-based alloy (Inconel 600); the resistance wire can be made of a nickel-chromium alloy (such as Cr20Ni80) or an iron-chromium-aluminum alloy. The solid heat storage material can be magnesium bricks, etc.

[0047] In one embodiment, the heat exchanger is a multi-stage heat exchanger; or, the heat exchanger includes multiple sub-heat exchangers to perform gradient heat exchange.

[0048] In one embodiment, such as Figure 1 As shown, the heat exchanger includes multiple sub-heat exchangers, including a first heat exchanger 14 and a second heat exchanger 15.

[0049] The plurality of solid heat storage members comprises a plurality of first solid heat storage members and a plurality of second solid heat storage members, and the plurality of first solid heat storage members are provided with a first heat exchange air duct, and the plurality of second solid heat storage members are provided with a second heat exchange air duct.

[0050] It should be noted that, optionally, the materials of the first solid heat storage members and the second solid heat storage members are the same, and the upper limit of temperature and the upper limit of stored heat are also the same. When discharging heat, the flow of hot air in the first heat exchange air duct and the second heat exchange air duct can be controlled to be different, or the heat exchange area of the heat releasing end (or the heat absorbing end) of the first heat exchanger and the second heat exchanger is different, so that the first solid heat storage members release more heat and the temperature drops more, and the heat is used to heat water to steam in the first heat exchanger; the second solid heat storage members release less heat and the temperature drops less, and the heat is used to superheat the steam in the second heat exchanger. Optionally, the first solid heat storage members and the second solid heat storage members can also be divided according to the different solid heat storage materials filled inside, and the upper limit of heat storage per unit volume of different solid heat storage materials is different.

[0051] The first heat exchange air duct forms a loop between the plurality of first solid heat storage members, and the second heat exchange air duct also does so; for example, the plurality of first solid heat storage members form a square frame, and a first solid heat storage member is also placed in the middle of the square frame, and the first heat exchange air duct is accommodated between the first solid heat storage member in the middle and the first solid heat storage members around. Moreover, fans are arranged at the first heat exchange air duct and the second heat exchange air duct to improve the heat exchange rate with the heat absorbing end of the heat exchanger; wherein the main body part of the motor of the fan is located outside the electric heat storage boiler 13, and then drives the impeller arranged in the heat exchange air duct through the output shaft.

[0052] Specifically, the heat releasing end of the first heat exchanger 14 is in communication with the first heat exchange air duct, and the heat absorbing end inlet of the first heat exchanger 14 is in communication with the water supply pipeline 19 of the electric heat storage boiler. The heat releasing end of the second heat exchanger 15 is in communication with the second heat exchange air duct, the heat absorbing end inlet of the second heat exchanger 15 is in communication with the heat absorbing end outlet of the first heat exchanger 14, and the heat absorbing end outlet of the second heat exchanger 15 is in communication with the cold section and / or the hot section of the reheater 2 through the reserve steam pipeline 21, and the fourth valve group 211 is arranged on the reserve steam pipeline 21. The heat absorbing end of the first heat exchanger 14 and the second heat exchanger 15 absorbs gradient heat from the plurality of solid heat storage members and gradient heats the water supply to produce steam.

[0053] Preferably, a steam drum 16 is arranged between the heat absorbing end outlet of the first heat exchanger 14 and the heat absorbing end inlet of the second heat exchanger 15.

[0054] The existing steam drum 16 can be selected, and the main function is to separate the steam and water produced by the first heat exchanger 14, and convert it into high-quality saturated steam; in addition, it also has the functions of purification and decontamination. The connection relationship of the steam drum 16 with the first heat exchanger 14 and the second heat exchanger 15 is that the steam inlet of the steam drum 16 is communicated with the heat absorption end outlet of the first heat exchanger 14, the steam outlet of the steam drum 16 is communicated with the heat absorption end inlet of the second heat exchanger 15, and the water outlet at the bottom of the steam drum 16 is communicated with the heat absorption end of the first heat exchanger 14. Since the water discharged from the steam drum 16 is water obtained by steam-water separation, the temperature is relatively high, and it is not suitable to directly mix with the water supply of the water supply pipeline 19 of the electric heat storage boiler, therefore, the water outlet at the bottom of the steam drum 16 can be communicated to the middle section of the heat absorption end of the first heat exchanger 14. In addition, the upper water pipeline 20 of the steam drum 16 is communicated with the condensate water pipeline, and the upper water pipeline 20 provides water for the cooling wall arranged inside the steam drum 16, and the third valve group 201 is arranged on the upper water pipeline 20.

[0055] Preferably, the heat absorption end outlet of the second heat exchanger 15 is also communicated with one end of the starting steam pipeline 22 of the thermal power unit, and the other end of the starting steam pipeline 22 is communicated with the starting steam inlet of the thermal power unit; it should be noted that most of the existing thermal power units rely on the starting boiler to provide starting steam, and the heat absorption end outlet in the present application is communicated with one or more of these starting steam inlets, which can replace the original starting boiler. When the power station boiler 1 is restarted after being stopped, the steam prepared by the electric heat storage boiler 13 is used as the starting steam source of the thermal power plant unit. The fifth valve group 221 is arranged on the starting steam pipeline 22.

[0056] The heat absorption end outlet of the second heat exchanger 15 is also communicated with the industrial steam supply pipeline 23, and the sixth valve group 231 is arranged on the industrial steam supply pipeline 23. When the electric load of the thermal power plant is low, the system can store the heat energy of the electric heat storage boiler 13; when the electric load of the thermal power plant is high, the electric heat storage boiler 13 prepares steam to provide for external steam users or heat users, reduces the pressure of the main steam turbine for external steam supply, increases the proportion of steam used for power generation of the main steam turbine, and enables it to operate at peak.

[0057] Preferably, the condensate water pipeline is arranged between the low-pressure cylinder 5 steam outlet and the water inlet of the power station boiler 1, and the condenser 7, the condensate pump 8, the low-pressure heater 9, the deaerator 10, the main feed water pump 11 and the high-pressure heater 12 are sequentially arranged on the condensate water pipeline.

[0058] The water supply pipeline 19 of the electric heat storage boiler is connected with the condensate water pipeline downstream of the deaerator 10, and the water supply pump 17 is arranged on the water supply pipeline 19 of the electric heat storage boiler. The frequency control of the water supply pump 17 is used to adjust the steam production of the heat exchanger, so as to adjust the load and speed of the main steam turbine unit.

[0059] In the technical solution of the present application, the operation load of the steam turbine unit of the traditional thermal power plant is preferably stable, although the power can be adjusted, it still cannot adapt to the frequent changes of the daytime and nighttime electricity load. When the electricity load demand is low, the system of the present application utilizes part of the electricity of the thermal power unit to drive the electric heat storage boiler 13, converts the electricity into heat energy and stores it in the solid heat storage member, thereby avoiding the waste of electricity; when the electricity load demand is high, the electric heat storage boiler 13 utilizes the stored heat energy to prepare steam and provides it to the power plant boiler 1 or the main steam turbine, so that the main steam turbine and the generator can operate at the peak.

[0060] Preferably, the system further comprises a desalted water pipeline 18, which is provided with a first valve group 181. One end of the desalted water pipeline 18 is connected with the water supply pipeline 19 of the electric heat storage boiler and the upper water pipeline 20, and the other end is connected with an external water source, and the other end is connected with a desalted external water source. When the power plant boiler 1 is disabled, the main steam turbine also stops working and no longer generates condensate water, therefore, the desalted water pipeline 18 is used to supply water to the electric heat storage boiler 13 and the steam drum 16, the steam prepared by the electric heat storage boiler 13 is used as the starting steam source of the power plant boiler 1, or is provided to the industrial steam supply pipeline 23. In addition, when the power plant boiler 1 is running, the temperature of the outlet of the deaerator 10 exceeds 100℃, and cannot be directly applied to the cold start of the electric heat storage boiler 13 and the steam drum 16, therefore, the desalted water pipeline 18 is also used to provide desalted water for the electric heat storage boiler 13 and the steam drum 16 and related pipelines during the cold start.

[0061] In the description of the present application, the terms "one embodiment", "some embodiments", "specific embodiments" and the like are intended to mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0062] It should be understood that the above specific embodiments of the present application are only used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation of the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. In addition, the claims of the present application are intended to cover all changes and modifications falling within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A thermal power plant electric energy storage deep regulation peak shaving system, a thermal power unit of a thermal power plant has a power plant boiler (1), a main steam turbine and a generator (6), a reheater (2) is arranged in the power plant boiler (1), the reheater (2) is used for heating steam discharged by a high pressure cylinder (3) of the main steam turbine, and reheated steam obtained by heating is provided to a medium pressure cylinder (4) of the main steam turbine, characterized in that, The utility model relates to an electric heat storage boiler (13) comprising: a shell, an electric heater, a plurality of solid heat storage elements, a heat exchange air duct and a heat exchanger arranged inside the shell; a heating part of the electric heater is arranged in the solid heat storage elements and is electrically connected with the generator (6); the solid heat storage elements are filled with solid heat storage materials; the heat exchange air duct is arranged between the solid heat storage elements; the heat exchanger is arranged on one side of the solid heat storage elements, the heat releasing end of the heat exchanger is communicated with the heat exchange air duct, the inlet of the heat absorbing end of the heat exchanger is communicated with the water supply pipeline (19) of the electric heat storage boiler, and the outlet of the heat absorbing end of the heat exchanger is communicated with the power station boiler (1) or the main steam turbine.

2. The thermal power plant electrical energy storage deep peak shaving system of claim 1, wherein, the water supply pipeline (19) of the electric heat storage boiler is communicated with the condensate water pipeline downstream of the main steam turbine; the outlet of the heat absorbing end of the heat exchanger is connected with the cold section and / or the hot section of the reheater (2); the electric heat storage boiler (13) is electrically connected with the output end of the generator (6) or the booster station of the thermal power plant.

3. The thermal power plant electrical energy storage deep peak shaving system of claim 2, wherein, the heat exchanger is a multi-stage heat exchanger; or the heat exchanger comprises a plurality of sub-heat exchangers.

4. The thermal power plant electrical energy storage deep peak shaving system of claim 3, wherein, the plurality of sub-heat exchangers comprises a first heat exchanger (14) and a second heat exchanger (15); the plurality of solid heat storage elements comprises a plurality of first solid heat storage elements and a plurality of second solid heat storage elements, a first heat exchange air duct is arranged between the plurality of first solid heat storage elements, and a second heat exchange air duct is arranged between the plurality of second solid heat storage elements; the heat releasing end of the first heat exchanger (14) is communicated with the first heat exchange air duct, and the inlet of the heat absorbing end of the first heat exchanger (14) is communicated with the water supply pipeline (19) of the electric heat storage boiler; the heat releasing end of the second heat exchanger (15) is communicated with the second heat exchange air duct, the inlet of the heat absorbing end of the second heat exchanger (15) is communicated with the outlet of the heat absorbing end of the first heat exchanger (14), and the outlet of the heat absorbing end of the second heat exchanger (15) is communicated with the cold section and / or the hot section of the reheater (2).

5. The thermal power plant electrical energy storage deep peak shaving system of claim 4, wherein, a steam drum (16) is arranged between the outlet of the heat absorbing end of the first heat exchanger (14) and the inlet of the heat absorbing end of the second heat exchanger (15); the steam inlet of the steam drum (16) is communicated with the outlet of the heat absorbing end of the first heat exchanger (14), the steam outlet of the steam drum (16) is communicated with the inlet of the heat absorbing end of the second heat exchanger (15), the water outlet at the bottom of the steam drum (16) is communicated with the heat absorbing end of the first heat exchanger (14), and the upper water pipeline (20) of the steam drum (16) is communicated with the condensate water pipeline.

6. The thermal power plant electrical energy storage deep peak clipping system of claim 4, wherein, the outlet of the heat absorbing end of the second heat exchanger (15) is further communicated with one end of a unit start steam pipeline (22), and the other end of the unit start steam pipeline (22) is communicated with a thermal power unit start steam inlet; or the outlet of the heat absorbing end of the second heat exchanger (15) is further communicated with an industrial steam supply pipeline (23).

7. The thermal power plant electrical energy storage deep peak clipping system of claim 2, wherein, the condensate water pipeline is arranged between the outlet of the low-pressure cylinder (5) and the water supply inlet of the power station boiler (1), and the condenser (7), the condensate pump (8), the low-pressure heater (9), the deaerator (10), the main feed water pump (11) and the high-pressure heater (12) are sequentially arranged on the condensate water pipeline. The water supply pipeline (19) of the electric heat accumulator boiler is connected with the condensate water pipeline downstream of the deaerator (10), and a water supply pump (17) is arranged on the water supply pipeline (19) of the electric heat accumulator boiler.

8. The thermal power plant electrical energy storage deep peak clipping system of claim 5, wherein, The system further comprises a desalted water pipeline, one end of which is connected with the water supply pipeline (19) of the electric heat accumulator boiler and the water supply pipeline (20), and the other end of which is connected with an external water source.

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