Nuclear wind and light coupling heat storage and steam supply system
Through the nuclear-wind-solar coupled heat storage and steam supply system, the wind energy and solar energy near the nuclear power plant are utilized to convert the abandoned wind and solar energy into thermal energy. Combined with high-pressure hot water storage tanks and electric heat storage boilers, the problems of peak regulation and wind and solar resource consumption of nuclear power plants are solved, and the economy and safety of nuclear power plants are improved.
Patent Information
- Application Number
- CN202510937859.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-08
- Publication Date
- 2025-09-23
AI Technical Summary
When nuclear power plants operate at peak load and load reduction, wind and solar resources cannot be fully absorbed, and the phenomenon of wind and solar power abandonment is serious, affecting the economy and safety of nuclear power plants. In addition, the problem of nuclear energy supplying steam and energy to the surrounding areas of the plant has not been effectively solved.
A nuclear-wind-solar coupled heat storage and steam supply system was designed. Through the combination of high-pressure hot water storage tanks and electric heat storage boilers, the wind and solar energy near the nuclear power plant were utilized to convert the abandoned wind and solar energy into thermal energy. Combined with nuclear energy steam supply, a regional microgrid was constructed to achieve local consumption of wind and solar resources and peak load management of nuclear power units.
It effectively solved the problems of peak regulation of nuclear power plants and consumption of wind and solar resources, reduced peak regulation losses, improved the economic benefits and operational safety of nuclear power plants, avoided nuclear power fluctuations, and reduced the production of radioactive waste.
Smart Images
Figure CN120684707A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of nuclear power technology, and in particular relates to a nuclear-wind-solar coupled heat storage and steam supply system. Background Art
[0002] With the rapid development of renewable energy sources such as wind and solar power, the pressure on nuclear power peak regulation will further increase. To this end, research on nuclear energy heat storage technology has been conducted. By storing and releasing heat, the range of thermal load variations in nuclear power heating units can be expanded, resolving the problem of static and dynamic thermal decoupling. This addresses the peak regulation of nuclear power units, reduces the number of power changes to ensure the safe operation of fuel assemblies, utilizes peak load regulation to reduce peak regulation losses, absorbs fluctuations in nuclear power, electrical power, and thermal load, and prevents steam supply interruptions, thereby improving the economic efficiency of nuclear power units.
[0003] On the other hand, there is available wind and solar energy in and around nuclear power plants, but the intermittent nature of these sources negatively impacts their integration into the grid, leading to curtailment. Furthermore, within the goal of building a new power system, the issue of nuclear energy providing low-carbon, environmentally friendly industrial steam for areas surrounding nuclear power plants has yet to be effectively addressed.
[0004] The existence of the above problems, the peak-shaving and load-reducing operation of nuclear power plants, the inability to fully absorb wind and solar resources, and the problem of nuclear energy supplying steam and energy to the surrounding areas of the plant have affected the overall interests of the nuclear power plants. Summary of the Invention
[0005] To overcome the problems existing in the related art, a nuclear-wind-solar coupled heat storage steam supply system is provided. In the system, steam discharged from the high-pressure cylinder of the nuclear power plant steam turbine sequentially heats a secondary preheater and a primary preheater, and condensed water is returned to the nuclear power plant condenser. Feed water provided by the water supply device is sequentially heated by the primary preheater and the secondary preheater. The primary preheater supplies low-temperature hot water to the high-pressure hot water storage tank, the secondary preheater supplies high-pressure hot water to the electric thermal storage boiler, and the secondary preheater also supplies high-pressure hot water to the high-pressure hot water storage tank. The working pressure of the high-pressure hot water storage tank is 1.2 to 1.6 MPa, and the heat storage temperature is 50 to 175°C; the pressure of the steam discharged from the high-pressure cylinder of the nuclear power plant steam turbine is less than 1 MPa; the temperature of the low-temperature hot water supplied by the primary preheater to the high-pressure hot water storage tank is less than or equal to 50°C; the temperature of the high-pressure hot water supplied by the secondary preheater to the electric thermal storage boiler is less than or equal to 175°C and the pressure is less than or equal to 1.3 MPa; the working pressure of the high-pressure hot water storage tank is 1.2 to 1.6 MPa, and the heat storage temperature is 50 to 175°C;
[0006] When the high-pressure water storage tank is in the heat release state, it supplies high-pressure hot water to the electric thermal storage boiler through a pump and receives low-temperature hot water from the primary preheater; when the high-pressure water storage tank is in the heat storage state, it receives high-pressure hot water from the secondary preheater and supplies low-temperature hot water to the secondary preheater through a pump;
[0007] The energy storage bus receives the electric energy output from any one or more of the nuclear power plant generator sets, wind turbine generator sets and photovoltaic generator sets when the output power is limited, and transmits it to the electric thermal storage boiler;
[0008] The electric thermal storage boiler receives electricity from the energy storage bus, converts the electricity into thermal energy for storage, and receives high-pressure hot water from the secondary preheater and the high-pressure hot water storage tank. It heats the high-pressure hot water with the stored thermal energy to generate industrial steam for users.
[0009] In one possible implementation, the electricity from the nuclear power plant generator set is transmitted to the nuclear power plant main connection, and is then stepped down by the wind-solar transformer and transmitted to the energy storage bus. The electricity from the wind turbine generator set is transmitted to the energy storage bus through the wind power bus and wind power transformer. The electricity from the photovoltaic generator set is transmitted to the energy storage bus through the photovoltaic bus and photovoltaic transformer.
[0010] The electricity from wind turbines and photovoltaic generators is also transmitted to the nuclear power plant's outgoing bus through the energy storage bus and wind-solar transformers to supply power to the grid.
[0011] In one possible implementation, when the nuclear power unit is operating at peak load, the steam consumption of the high-pressure cylinder exhaust steam of the secondary preheater is increased, and the heat of the high-pressure cylinder exhaust steam of the secondary preheater is converted into high-temperature hot water heat, which is stored in a high-pressure hot water storage tank; when the nuclear power unit further reduces the load, the power generated by the nuclear power plant generator set is transmitted to the energy storage bus through the wind and solar transformer, and the electrical energy is converted into thermal energy for storage in the electric thermal storage boiler.
[0012] In one possible implementation, when the nuclear power unit is operating at peak load, the exhaust steam consumption of the high-pressure cylinder of the secondary preheater is reduced, and the high-temperature hot water stored in the high-pressure water storage tank is transported to the electric thermal storage boiler to meet the load increase rate of the nuclear power unit. At the same time, the electrochemical energy storage device releases part of the electric energy and sends it to the nuclear power plant outgoing bus through the wind and solar transformer to meet the grid response requirements.
[0013] In a possible implementation, an electrochemical energy storage device is provided on the energy storage bus.
[0014] In one possible implementation, when the output power of a nuclear power plant is limited and the output power of wind turbines and photovoltaic generators is limited, excess electricity is converted into thermal energy for storage in an electric thermal storage boiler. The thermal energy stored in the electric thermal storage boiler is used to heat high-temperature hot water to generate industrial steam for supply to users.
[0015] In a possible implementation, the heating steam of the secondary preheater is steam extracted from a steam turbine of a nuclear power plant.
[0016] In a possible implementation, the high-pressure hot water output by the secondary preheater is directly supplied to users.
[0017] In one possible implementation, the high-pressure hot water storage tank is composed of multiple storage tanks connected in parallel; the electric thermal storage boiler is composed of multiple boilers connected in parallel, some of which operate in a charging condition and some of which operate in a discharging condition.
[0018] In one possible implementation, the heat of the high-pressure cylinder exhaust steam is converted into high-temperature water through a charging heat exchanger and stored in a high-pressure water storage tank, and the heat of the high-temperature water in the high-pressure water storage tank is transferred to the water supply of the electric thermal storage boiler through a dissipating heat exchanger;
[0019] The high-pressure hot water storage tank charging process includes: using the high-pressure cylinder exhaust steam to heat the charging heat exchanger, and the generated high-temperature water is transported to the high-pressure hot water storage tank for storage through a valve, while the low-temperature hot water in the high-pressure hot water storage tank is discharged by a pump;
[0020] The heat release process of the high-pressure hot water storage tank includes: the water supply device supplies water to the heat release heat exchanger, the high-temperature hot water in the high-pressure hot water storage tank is discharged by the pump, the heat release heat exchanger is heated, the low-temperature water after heat exchange is transported to the high-pressure hot water storage tank for storage through the valve, and the high-temperature water after heat exchange is supplied to the electric thermal storage boiler.
[0021] The beneficial effects of the present disclosure are:
[0022] 1. Utilize wind energy in areas such as sea and mountainous areas near nuclear power plants, convert abandoned wind energy into thermal energy and jointly supply steam to nuclear power plants;
[0023] 2. Utilize solar energy in sea and mountainous areas near nuclear power plants, convert abandoned solar energy into thermal energy and jointly supply steam to nuclear power plants;
[0024] 3. Using high-pressure hot water storage tanks to store heat for peak load regulation, it bears part of the peak load regulation of nuclear power units, thus reducing the peak load regulation losses of nuclear power units;
[0025] 4. By coupling nuclear energy with wind and solar power to supply steam, a regional microgrid was constructed, effectively solving the problem of nuclear power consumption and the competition between wind and solar power for grid access, and solving the problem of local consumption of nuclear power and wind and solar power.
[0026] 5. The two-stage heat storage system of high-pressure hot water storage tanks and electric thermal storage boilers reduces the cost of nuclear power heat storage peak load regulation, utilizes the peak load regulation to supply industrial steam, and improves the overall economic benefits of the nuclear power plant;
[0027] 6. When a nuclear power plant operates at peak load, the heat and electricity of the steam turbine generator set are stored in a high-pressure hot water storage tank and an electric heat storage boiler, respectively. This avoids nuclear power fluctuations caused by load reduction operation, improves the operating safety of the nuclear power unit, and reduces the production of radioactive waste. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 This is a schematic diagram of a nuclear-wind-solar coupled heat storage and steam supply system shown in an embodiment of the present disclosure.
[0029] Figure 2 It is a schematic diagram of another nuclear-wind-solar coupled heat storage and steam supply system shown in an embodiment of the present disclosure.
[0030] In the picture:
[0031] 1: Steam turbine; 2: Secondary preheater; 3: Primary preheater; 4: Condenser; 5: Feedwater device;
[0032] 6: High-pressure hot water storage tank; 7: Electric thermal storage boiler; 8: Electrochemical energy storage device; 9: Wind turbine generator set;
[0033] 10: Photovoltaic generator set; 20: Nuclear power plant steam turbine generator; 21: Nuclear power plant main transformer;
[0034] 22: Wind-solar transformer; 23: Wind power transformer; 24: Photovoltaic transformer; 25: Nuclear power plant outgoing busbar;
[0035] 26: Wind power busbar; 27: Photovoltaic busbar; 28: Energy storage busbar; 30: Pump;
[0036] 40: Industrial steam users; 50: Charging heat exchanger; 51: Discharging heat exchanger. DETAILED DESCRIPTION
[0037] The present disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0038] Unless otherwise defined, the technical and scientific terms used in this disclosure have the same meanings as those generally understood by those skilled in the art to which this disclosure belongs; the terms used in this disclosure are only for the purpose of describing specific embodiments and are not intended to limit this disclosure; the term "including" and any variations thereof in this disclosure are intended to cover non-exclusive inclusions. Obviously, the embodiments described in this disclosure are only some of the embodiments of this disclosure, not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those of ordinary skill in the art without making any creative work are within the scope of protection of this disclosure.
[0039] References to "embodiments" in this disclosure mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0040] Figure 1 is a schematic diagram of a nuclear-wind-solar coupled heat storage and steam supply system shown in an embodiment of the present disclosure. Figure 1 As shown, in the system, the high-pressure cylinder exhaust steam of the steam turbine 1 heats the secondary preheater 2 and the primary preheater 3 in sequence, the heated steam condensate output by the primary preheater 3 is returned to the condenser 4 of the nuclear power plant, the feed water supplied by the water supply device 5 is heated by the primary preheater 3 to form low-temperature hot water, and the low-pressure hot water output by the primary preheater 3 is heated by the secondary preheater 2 to form high-pressure hot water; the secondary preheater 2 supplies high-pressure hot water to the electric thermal storage boiler 7, and the heat energy stored in the electric thermal storage boiler 7 heats the input high-pressure hot water to convert it into industrial steam, which is supplied to the industrial steam user 40; the secondary preheater 2 can supply high-pressure hot water to the high-pressure hot water storage tank 6, and the primary preheater 3 can supply low-temperature hot water to the high-pressure hot water storage tank 6. The pressure of the steam is less than 1MPa; the temperature of the low-temperature hot water supplied by the first-level preheater to the high-pressure water storage tank is less than or equal to 50°C; the temperature of the high-pressure hot water supplied by the second-level preheater to the electric heat storage boiler is less than or equal to 175°C, and the pressure is less than or equal to 1.3MPa; the working pressure of the high-pressure water storage tank is 1.2 to 1.6MPa, and the heat storage temperature is 50 to 175°C; the high-pressure water storage tank 6 supplies low-temperature hot water to the first-level preheater 3 through the pump 30; the high-pressure water storage tank 6 can also supply high-temperature hot water to the electric heat storage boiler 7 through the pump 30; when the high-pressure water storage tank 6 is in the heat release working condition, low-temperature hot water is replenished to the high-pressure water storage tank 6 from the first-level preheater 3, and the high-pressure water storage tank 6 supplies high-temperature hot water to the electric heat storage boiler 7 through the pump 30.
[0041] The electricity generated by the nuclear power plant's steam turbine generator 20 is transmitted via the plant's main transformer 21 to the plant's outgoing bus 25. The plant's outgoing bus 25 then transmits the reduced-load electricity from the plant to the energy storage bus 28 via the wind-solar transformer 22. The electricity generated by the wind turbine generator 9 is transmitted via the wind power bus 26 and wind power transformer 23 to the energy storage bus 28. The electricity generated by the photovoltaic generator 10 is transmitted via the photovoltaic bus 27 and photovoltaic transformer 24 to the energy storage bus 28. The electricity generated by the wind turbine generator 9 and the photovoltaic generator 10 is transmitted via the energy storage bus 28 and wind-solar transformer 22 to the plant's outgoing bus 25, where it is then transmitted to the power grid. The surplus electricity from nuclear power, wind power, and photovoltaic power is transmitted via the energy storage bus 28 to the electric thermal storage boiler 7, where it is converted into heat and stored within the electric thermal storage boiler 7. In one possible implementation, an electrochemical energy storage device 8 is provided on the energy storage bus 28 to smooth out power load fluctuations.
[0042] like Figure 1 As shown, the normal steam supply process of the system includes: the high-pressure cylinder exhaust steam of the nuclear power plant turbine 1 heats the secondary preheater 2 and the primary preheater 3 in sequence, and the heated steam condenses water and returns to the nuclear power plant condenser 4; the water supply device 5 supplies water to the secondary preheater 2 after passing through the primary preheater 3; the secondary preheater 2 supplies high-pressure hot water to the electric thermal storage boiler 7; the heat energy stored in the electric thermal storage boiler 7 heats the high-pressure hot water and converts it into industrial steam, which is supplied to the industrial steam user 40.
[0043] In one possible implementation, the heating steam from secondary preheater 2 is extracted steam from the nuclear power plant's steam turbine. The condensate from the heating steam output from secondary preheater 3 is returned to the nuclear power plant's condensate system. The high-pressure hot water from secondary preheater 2 is directly supplied to user 40.
[0044] like Figure 1 As shown, the system's heat storage process includes: When the nuclear power units are operating for peak load reduction, the high-pressure exhaust steam consumption of the secondary preheater 2 is increased, converting the heat from the exhaust steam into high-temperature hot water, which is stored in the high-pressure hot water storage tank 6. This reduces the load of the nuclear power plant's steam turbines while maintaining nuclear power output. When the nuclear power units are further reduced in load, the power generated by the nuclear power plant's generators is transmitted to the energy storage bus 28 via the wind-solar transformer 22, where the electrical energy is converted into thermal energy for storage in the electric thermal storage boiler 7. When the high-pressure hot water storage tank 6 is operating in the charging state, valves 13 and 17 are closed, valves 12, 14, and 15 are opened, and pump 30 is activated to transfer the low-temperature hot water in the high-pressure hot water storage tank 6 to the secondary preheater 2. Simultaneously, the high-temperature hot water at the outlet of the secondary preheater 2 enters the high-pressure hot water storage tank 6 through valve 15. When the electric thermal storage boiler 7 is operating in the charging state, load fluctuations are smoothed by the electrochemical energy storage device 8.
[0045] In one possible implementation, the high-pressure hot water storage tank 6 is composed of multiple high-pressure hot water storage tanks connected in parallel. The electric thermal storage boiler 7 is composed of multiple electric thermal storage boilers connected in parallel. Some of the boilers operate in a charging state, while others operate in a discharging state.
[0046] like Figure 1 As shown, the system's heat release process includes: During peak load regulation, the high-pressure cylinder exhaust steam consumption of the secondary preheater 2 is reduced, and the high-temperature hot water stored in the high-pressure hot water storage tank 6 is delivered to the electric thermal storage boiler 7 to meet the nuclear power unit's load ramp-up rate. Simultaneously, the electrochemical energy storage device 8 releases some electrical energy, which is then transmitted via the wind-solar transformer 22 to the nuclear power plant's outgoing bus 25 to meet grid response requirements. When the high-pressure hot water storage tank 6 is operating in the heat release state, valves 15 and 14 are closed, valves 13, 17, and 18 are opened, and pump 31 is activated to deliver the high-temperature hot water in the high-pressure hot water storage tank 6 to the electric thermal storage boiler 7. Simultaneously, the low-temperature hot water at the outlet of the primary preheater 3 enters the high-pressure hot water storage tank 6 through valve 13.
[0047] like Figure 1 As shown in the figure, the system's nuclear, wind, and solar power generation process includes:
[0048] The electricity generated by the nuclear power plant's steam turbine generator 20 is transmitted via the plant's main transformer 21 to the plant's outgoing bus 25. The electricity generated by the wind turbine generator 9 is transmitted via the wind bus 26 and wind transformer 23 to the energy storage bus 28. The electricity generated by the photovoltaic generator 10 is transmitted via the photovoltaic bus 27 and photovoltaic transformer 24 to the energy storage bus 28. The electricity generated by the wind turbine generator 9 and the photovoltaic generator 10 is transmitted via the energy storage bus 28 and wind-solar transformer 22 to the nuclear power plant's outgoing bus 25, where it is then transmitted to the power grid. An electrochemical energy storage device 8 is installed downstream of the energy storage bus 28 to smooth load fluctuations. When the nuclear power plant's output power is limited, and the output power of the wind turbine generator 9 and the photovoltaic generator 10 is limited, the excess electricity is converted into thermal energy and stored in the electric thermal storage boiler 7. The thermal energy stored in the electric thermal storage boiler 7 is used to heat high-temperature hot water to generate industrial steam for users.
[0049] Figure 2 is a schematic diagram of another nuclear-wind-solar coupled thermal storage and steam supply system shown in an embodiment of the present disclosure, such as Figure 2 As shown, the high-pressure hot water heat storage part serves as a heat storage and intermediate heat exchange circuit. The heat of the high-pressure cylinder exhaust steam is converted into high-temperature water through the heat charging heat exchanger 50 and stored in the high-pressure hot water storage tank 6. The heat of the high-temperature water in the high-pressure hot water storage tank is transferred to the water supply of the electric thermal storage boiler 7 through the heat releasing heat exchanger 51.
[0050] like Figure 2As shown, the high-pressure hot water storage tank charging process includes: using high-pressure cylinder exhaust steam to heat the charging heat exchanger 50, and the generated high-temperature water is transported to the high-pressure hot water storage tank 6 for storage through a valve, and at the same time, the low-temperature hot water in the high-pressure hot water storage tank 6 is discharged by the pump 30.
[0051] The heat release process of the high-pressure hot water storage tank includes: the water supply device 5 supplies water to the heat release heat exchanger 51, the high-temperature hot water in the high-pressure hot water storage tank 6 is discharged through the pump 31, the heat release heat exchanger 51 is heated, and the low-temperature water after heat exchange is transported to the high-pressure hot water storage tank 6 for storage through the valve 19. The high-temperature water after heat exchange is supplied to the electric heat storage boiler 7.
[0052] While various embodiments of the present disclosure have been described above, the above descriptions are illustrative, non-exhaustive, and not intended to be limiting of the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to existing technologies, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. A nuclear-wind-solar coupled heat storage and steam supply system, characterized in that: In the system, steam discharged from the high-pressure cylinder of the nuclear power plant's steam turbine sequentially heats the secondary preheater and the primary preheater, and condensed water is returned to the nuclear power plant's condenser. The feed water provided by the feedwater device is sequentially heated by the primary preheater and the secondary preheater. The primary preheater supplies low-temperature hot water to the high-pressure water storage tank, and the secondary preheater supplies high-pressure hot water to the electric heat storage boiler. The secondary preheater also supplies high-pressure hot water to the high-pressure water storage tank. When the high-pressure water storage tank is in the heat release state, it supplies high-pressure hot water to the electric thermal storage boiler through a pump and receives low-temperature hot water from the primary preheater; when the high-pressure water storage tank is in the heat storage state, it receives high-pressure hot water from the secondary preheater and supplies low-temperature hot water to the secondary preheater through a pump; The energy storage bus receives the electric energy output from any one or more of the nuclear power plant generator sets, wind turbine generator sets and photovoltaic generator sets when the output power is limited, and transmits it to the electric thermal storage boiler; The electric thermal storage boiler receives electricity from the energy storage bus, converts the electricity into thermal energy for storage, and receives high-pressure hot water from the secondary preheater and the high-pressure hot water storage tank. It heats the high-pressure hot water with the stored thermal energy to generate industrial steam for users.
2. The system according to claim 1, wherein: The electric energy of the nuclear power plant generator set is transmitted to the main connection of the nuclear power plant, and is then stepped down by the wind-solar transformer and transmitted to the energy storage bus. The electric energy of the wind turbine generator set is transmitted to the energy storage bus through the wind power bus and wind power transformer. The electric energy of the photovoltaic generator set is transmitted to the energy storage bus through the photovoltaic bus and photovoltaic transformer. The electricity from wind turbines and photovoltaic generators is also transmitted to the nuclear power plant's outgoing bus through the energy storage bus and wind-solar transformers to supply power to the grid.
3. The system according to claim 1, wherein: When the nuclear power unit is operating at peak load, the steam consumption of the high-pressure cylinder exhaust steam of the secondary preheater is increased, and the heat of the high-pressure cylinder exhaust steam of the secondary preheater is converted into high-temperature hot water heat, which is stored in the high-pressure hot water storage tank; when the nuclear power unit further reduces the load, the power generated by the nuclear power plant generator set is transmitted to the energy storage bus through the wind and solar transformer, and the electrical energy is converted into thermal energy for storage in the electric thermal storage boiler.
4. The system according to claim 1, wherein: When the nuclear power unit is operating at peak load, the exhaust steam consumption of the high-pressure cylinder of the secondary preheater is reduced, and the high-temperature hot water stored in the high-pressure water storage tank is transported to the electric thermal storage boiler to meet the load increase rate of the nuclear power unit. At the same time, the electrochemical energy storage device releases part of the electric energy and sends it to the nuclear power plant outgoing bus through the wind and solar transformer to meet the grid response requirements.
5. The system according to claim 1, wherein: An electrochemical energy storage device is arranged on the energy storage busbar.
6. The system according to claim 1, wherein: When the output power of nuclear power plants is limited, and the output power of wind turbines and photovoltaic generators is limited, the excess electricity will be converted into thermal energy storage in the electric thermal storage boiler. The thermal energy stored in the electric thermal storage boiler will be used to heat high-temperature hot water to generate industrial steam for users.
7. The system according to claim 1, wherein: The heating steam of the secondary preheater is the extraction steam of the nuclear power plant turbine.
8. The system according to claim 1, wherein: The high-pressure hot water output by the secondary preheater is directly supplied to users.
9. The system according to claim 1, wherein: The high-pressure hot water storage tank is composed of multiple storage tanks connected in parallel; the electric thermal storage boiler is composed of multiple boilers connected in parallel, some of which work in the charging condition and some work in the releasing condition.
10. The system according to claim 1, wherein: The heat of the high-pressure cylinder exhaust steam is converted into high-temperature water through the heat charging heat exchanger and stored in the high-pressure water storage tank. The heat of the high-temperature water in the high-pressure water storage tank is transferred to the water supply of the electric heat storage boiler through the heat dissipation heat exchanger. The high-pressure hot water storage tank charging process includes: using the high-pressure cylinder exhaust steam to heat the charging heat exchanger, and the generated high-temperature water is transported to the high-pressure hot water storage tank for storage through a valve, while the low-temperature hot water in the high-pressure hot water storage tank is discharged by a pump; The heat release process of the high-pressure hot water storage tank includes: the water supply device supplies water to the heat release heat exchanger, the high-temperature hot water in the high-pressure hot water storage tank is discharged by the pump, the heat release heat exchanger is heated, the low-temperature water after heat exchange is transported to the high-pressure hot water storage tank for storage through the valve, and the high-temperature water after heat exchange is supplied to the electric thermal storage boiler.