Device for improving peak regulation capacity of nuclear power unit by nuclear power three-loop seawater

Abstract

The utility model discloses a device of nuclear power three loop seawater promotes nuclear power unit peak shaving capacity, it includes seawater screening low temperature distillation system, variable load system, generator export power taking system and control system. This device of nuclear power three loop seawater promotes nuclear power unit peak shaving capacity through setting up seawater screening low temperature distillation system, variable load system, generator export power taking system and control system, has realized the effective consumption of the redundant electric energy during nuclear power unit peak shaving, avoided the nuclear fuel waste caused by unit load reduction, simultaneously utilizes the cogeneration fresh water of nuclear power three loop's waste heat, improved energy utilization efficiency. Control system can realize the coordinated work of each system, promoted the peak shaving capacity and overall operation economy of nuclear power unit, ensured that peak shaving response speed promotion, broke the existing nuclear power peak shaving mode limit.

Description

Technical Field

[0001] This utility model relates to the field of steam extraction improvement of nuclear power unit turbine generator and seawater resource utilization technology, and in particular to a device for enhancing the peak-shaving capacity of nuclear power units by using seawater in the three-loop system. Background Technology

[0002] The depth of nuclear power unit participation in peak shaving, the duration of low-power operation, and the adjustment response time are all constrained by the commissioning mode. The root causes are mainly due to factors such as the selection of reactor thermal power control methods, core axial power tilt control, and primary loop boron concentration adjustment. Furthermore, compared to the 1%–5% / minute adjustment rate of thermal power units at 50%–100% rated power peak shaving response, the following problems currently exist in nuclear power unit peak shaving: 1. The unit's power increase and decrease time is relatively long. A 50% load change generally takes 3 hours, which is significantly longer than the peak shaving time of thermal power units.

[0003] 2. The operating time of nuclear power units at low power is limited; generally, the unit must increase its power after 6 hours.

[0004] 3. The electricity lost during peak shaving in nuclear power units is currently generally achieved through unit load reduction (generators not generating electricity). This restricts the release of the thermal energy contained in nuclear fuel within the prescribed fuel cycle, resulting in insufficient use of nuclear fuel, increasing the risk of nuclear power waste, and consequently driving up the operating costs of nuclear power plants.

[0005] 4. Currently, there is little comprehensive utilization of waste heat from the third loop of nuclear power plants both domestically and internationally, resulting in a large amount of heat generated by the reactors being directly discharged into the sea. This not only wastes heat energy, but also has a certain impact on the marine ecosystem.

[0006] 5. The state has clear requirements regarding ocean warming caused by waste heat discharge into the sea. If excessive waste heat is discharged into the sea when adding new units or building new nuclear power bases at the same site, it will cause the area of ​​the sea surface with a 4-degree warming zone to exceed the requirements, which will inevitably restrict the approval of nuclear power units. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a device for enhancing the peak-shaving capacity of a nuclear power unit by using seawater in the three-loop system.

[0008] The technical solution adopted by this utility model to solve its technical problem is: to construct a device for enhancing the peak-shaving capacity of a nuclear power unit by using seawater in a three-loop nuclear power system, which includes a seawater screening and low-temperature distillation system, a variable load system, a generator outlet power intake system, a steam turbine generator steam intake system, and a control system. The seawater screening and low-temperature distillation system is installed on the nuclear power plant's third loop and is used to recover waste heat from the nuclear power plant's third loop and produce fresh water. The variable load system is installed on the nuclear power plant's third loop and is used to absorb excess electrical energy during peak shaving of the nuclear power units. The generator outlet power intake system is installed on the line between the power plant generator outlet of the nuclear power unit and the step-up station. It is used to export excess peak-shaving power and supply the power to the seawater screening and low-temperature distillation system and the variable load system. One end of the steam turbine generator steam intake system is connected to the low-temperature waste steam and extraction steam conveying section of the nuclear power plant's secondary loop. The control system is communicatively connected to the seawater screening and low-temperature distillation system, the variable load system, the generator outlet power intake system, and the steam turbine generator steam intake system.

[0009] In some embodiments, the seawater screening and low-temperature distillation system includes a seawater screening unit, a low-temperature distillation unit, and a freshwater storage unit. The seawater screening unit is used to filter impurities in seawater, and its input end is connected to the seawater transmission pipeline of the nuclear power plant's third loop. The input end of the low-temperature distillation unit is connected to the output end of the seawater screening unit, and the waste heat of the nuclear power plant's third loop is used to distill the screened seawater. The input end of the freshwater storage unit is connected to the freshwater output end of the low-temperature distillation unit, and is used to store the co-produced freshwater.

[0010] In some embodiments, the freshwater storage unit is equipped with a water level monitoring device and a water quality testing device. The water level monitoring device is used to monitor the amount of freshwater stored in real time, and the water quality testing device is used to test the water quality of the freshwater.

[0011] In some embodiments, the variable load system includes at least one of an energy storage module and an on-site power conversion module; The energy storage module includes at least one of a thermal energy storage unit, an electrochemical energy storage unit, and a physical energy storage unit. The on-site power conversion module includes at least one of a thermal seawater desalination unit and an electrolytic hydrogen production unit.

[0012] In some embodiments, the variable load system includes at least one of the electrolytic hydrogen production units, and each of the electrolytic hydrogen production units includes an electrolyzer, a DC power supply, a gas-liquid separator, a chiller, and a water supply device. The input terminal of the DC power supply is connected to the generator output power system, or connected to the external power grid through a rectifier, and the output terminal of the DC power supply is connected to the electrolytic cell. The input end of the gas-liquid separation device is connected to the outlet of the electrolytic cell, and is used to separate the gas and liquid generated by electrolysis. The chiller is used to provide cooling for the electrolytic cell; The water supply device is used to provide water to the electrolytic hydrogen production unit.

[0013] In some embodiments, the electrolytic cell is one of an alkaline electrolytic cell, a proton exchange membrane electrolytic cell, an anion exchange membrane electrolytic cell, and a solid oxide electrolytic cell.

[0014] In some embodiments, the electrolytic cell includes a bipolar plate, a cathode electrode, a diaphragm, an anode electrode, a gasket, and a fastening screw; the bipolar plate, cathode electrode, diaphragm, anode electrode, and gasket are stacked and fixed by the fastening screw to form an electrolytic chamber; The electrolytic cell is provided with an electrolyte inlet and an electrolytic gas outlet. The electrolyte enters the electrolysis chamber through the electrolyte inlet, and the gas generated by electrolysis is discharged from the electrolytic gas outlet.

[0015] In some embodiments, the electrolytic hydrogen production unit further includes a purification device and a buffer device; The input end of the purification device is connected to the gas outlet of the gas-liquid separator for purifying the generated hydrogen. The buffer device is located at the output end of the purification device and is used to store the purified hydrogen.

[0016] In some embodiments, the buffer device is provided with a pressure monitoring device and a safety valve; The pressure monitoring device is used to monitor the pressure inside the buffer device in real time. The safety valve is used to automatically release pressure when the pressure exceeds a preset value.

[0017] The implementation of this utility model has the following beneficial effects: This device for enhancing the peak-shaving capacity of nuclear power units using seawater in the third loop of a nuclear power plant, through the establishment of a seawater screening and low-temperature distillation system, a variable load system, a generator outlet power intake system, and a control system, achieves effective utilization of excess electrical energy during the peak-shaving period of the nuclear power unit, avoiding nuclear fuel waste caused by unit load reduction. Simultaneously, it utilizes the waste heat from the third loop of the nuclear power plant to co-produce freshwater, improving energy utilization efficiency. The control system enables coordinated operation of various systems, enhancing the peak-shaving capacity and overall operational economy of the nuclear power unit, ensuring improved peak-shaving response speed, and breaking through the limitations of existing nuclear power peak-shaving modes. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings: Figure 1This is a schematic diagram of the overall structure of the device for enhancing the peak-shaving capacity of a nuclear power unit using seawater in a three-loop nuclear power system, as described in some embodiments of this utility model. Figure 2 This is a schematic diagram of the structure of the seawater screening and low-temperature distillation system in some embodiments of this utility model; Figure 3 This is a schematic diagram of the structure of the electrolytic hydrogen production unit in some embodiments of this utility model; Figure 4 This is a schematic diagram of the structure of the electrolytic cell in some embodiments of this utility model. Detailed Implementation

[0019] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0020] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0021] Please see Figures 1 to 4 This embodiment is a device for enhancing the peak-shaving capacity of a nuclear power unit by using seawater in a three-loop nuclear power system. It includes a seawater screening and low-temperature distillation system 1, a variable load system 2, a generator outlet power take-off system 3, a steam turbine generator steam take-off system 4, and a control system. The seawater screening and low-temperature distillation system 1 is installed on the nuclear power plant's third loop to recover waste heat from the nuclear power plant's third loop and produce fresh water. Variable load system 2 is installed on the nuclear power plant's third loop to absorb excess electrical energy during peak shaving periods of the nuclear power units; The generator outlet power intake system 3 is installed on the line between the power plant generator outlet of the nuclear power unit and the step-up station. It is used to export excess peak-shaving power and supply the power to the seawater screening low-temperature distillation system 1 and the variable load system 2. One end of the steam turbine generator steam extraction system 4 is connected to the low-temperature waste steam and extraction steam transmission section of the nuclear power plant's secondary loop; The control system is communicatively connected to the seawater screening and cryogenic distillation system 1, the variable load system 2, the generator outlet power take-off system 3, and the steam turbine generator steam take-off system 4. It can receive the operating data of each system in real time and issue control commands to realize the coordinated work of each system.

[0022] The generator outlet power intake system 3 is installed on the line between the nuclear power unit's generator outlet and the substation, a location that allows for convenient access to the electricity generated by the generator. During peak shaving periods of the nuclear power unit, when excess electricity occurs, this system extracts this electricity from the generator outlet and then supplies it stably to the seawater screening cryogenic distillation system 1 and the variable load system 2 via transmission lines, providing sufficient power support for the normal operation of these two systems. The generator outlet power intake system 3 can utilize existing or newly added transformers on the line between the generator outlet and the substation to extract excess peak-shaving electricity. One end of the turbine generator steam intake system 4 is connected to the cryogenic waste steam and extraction steam conveying section of the nuclear power unit's secondary loop. Specifically, the steam turbine generator steam extraction system is connected to the main steam inlet of the nuclear power turbine generator set, the extraction port between the turbine moving and stationary blades, or the exhaust steam side after the turbine has done work. It is used to consume the steam energy required for peak power generation in nuclear power in advance, provide low-cost heat energy for the seawater screening low-temperature distillation system 1, reduce its dependence on external sources, and improve the energy utilization efficiency during peak power generation, so that the heat energy generated during nuclear power operation can be more fully utilized.

[0023] The control system can collect real-time operating data, such as temperature, pressure, flow rate, and power consumption, from the seawater screening cryogenic distillation system 1, the variable load system 2, the generator outlet power intake system 3, and the turbine generator steam intake system 4 via sensors. This data is transmitted to the control system's processor via communication lines. When excess peak-shaving power is detected in the nuclear power unit, the control system automatically calculates and adjusts the transmission power of the generator outlet power intake system 3 and the steam extraction rate of the turbine generator steam intake system 4, increasing or decreasing the power supply to the variable load system 2, while simultaneously coordinating the steam input of the seawater screening cryogenic distillation system 1 to ensure the stable operation of the entire unit and prevent system failures due to sudden load changes.

[0024] Understandably, this device for enhancing the peak-shaving capacity of nuclear power units using seawater in the third loop of a nuclear power plant, through the establishment of a seawater screening and low-temperature distillation system 1, a variable load system 2, a generator outlet power intake system 3, a steam turbine generator steam intake system 4, and a control system, effectively utilizes excess electrical energy during peak-shaving periods, avoiding nuclear fuel waste caused by unit load reduction. Simultaneously, it utilizes the waste heat from the third loop to co-produce freshwater, improving energy efficiency. The control system enables coordinated operation of all systems, enhancing the peak-shaving capacity and overall operational economy of the nuclear power unit, ensuring improved peak-shaving response speed, and overcoming the limitations of existing nuclear power peak-shaving modes.

[0025] like Figure 2 As shown, the seawater screening and cryogenic distillation system 1 includes a seawater screening unit 11, a cryogenic distillation unit 12, and a freshwater storage unit 13. The seawater screening unit 11 filters impurities from the seawater, and its input end is connected to the seawater supply pipeline of the nuclear power plant's third loop. The input end of the cryogenic distillation unit 12 is connected to the output end of the seawater screening unit 11, utilizing the waste heat from the nuclear power plant's third loop to distill the screened seawater. The input end of the freshwater storage unit 13 is connected to the freshwater output end of the cryogenic distillation unit 12, and it is used to store the co-produced freshwater. Specifically, the input end of the seawater screening unit 11 is connected to the seawater supply pipeline of the nuclear power plant's third loop, and it is equipped with multi-stage filtration components such as coarse filter screens and precision filter membranes to efficiently filter impurities from the seawater, providing clean seawater raw materials for subsequent distillation processes. The input end of the cryogenic distillation unit 12 is connected to the output end of the seawater screening unit 11, and it can utilize waste steam from the nuclear power plant's second loop and extracted steam to distill the screened seawater, converting the seawater into pure freshwater vapor. The freshwater storage unit 13 is connected to the freshwater output of the cryogenic distillation unit 12 and is used to store the co-produced freshwater for later use. The seawater screening cryogenic distillation system 1 recovers seawater and waste heat from the nuclear power plant's third loop, avoiding energy waste, effectively reducing energy consumption, and improving energy utilization efficiency. The co-produced freshwater provides freshwater resources to coastal areas, increasing water resource utilization efficiency.

[0026] Variable load system 2 includes at least one of an energy storage module and an on-site power conversion module; the energy storage module includes at least one of a thermal energy storage unit, an electrochemical energy storage unit, and a physical energy storage unit; the on-site power conversion module includes at least one of a thermal seawater desalination unit and an electrolytic hydrogen production unit. The thermal energy storage unit can convert excess electrical energy into thermal energy for storage and release it when needed; the electrochemical energy storage unit can directly store electrical energy with a fast response speed. Variable load system 2 can realize the conversion of the energy form of lost electrical energy, achieving the utilization of peak-shaving power loss.

[0027] Variable load system 2 includes at least one electrolysis hydrogen production unit. When variable load system 2 includes multiple electrolysis hydrogen production units, these units constitute an electrolysis hydrogen production unit group. The control system controls the start and stop of each electrolysis hydrogen production unit through software, achieving flexible consumption of peak-shaving power. The electrolysis hydrogen production unit group adopts a modular design, with each module operating independently. A failure in one module does not affect the normal operation of other modules. The number and load of electrolysis hydrogen production units can be flexibly adjusted according to the amount of surplus electricity during peak-shaving periods, enabling variable load system 2 to adapt to different scales of electricity consumption needs and improving the system's adaptability to the peak-shaving conditions of nuclear power units. Utilizing surplus electricity from nuclear power units during peak-shaving periods to produce hydrogen not only achieves effective electricity consumption but also produces high-value-added hydrogen products, improving the comprehensive utilization value and economic benefits of energy.

[0028] like Figure 3 As shown, each electrolysis hydrogen production unit includes an electrolyzer 21, a DC power supply 22, a gas-liquid separator 23, a chiller 24, and a water supply device 25. The input of the DC power supply 22 is connected to the generator outlet power system 3 or an external power grid, and the output of the DC power supply 22 is connected to the electrolyzer 21. The input of the gas-liquid separator 23 is connected to the outlet of the electrolyzer 21 and is used to separate the gas and liquid produced by electrolysis. The chiller 24 is used to provide cooling for the electrolyzer 21. The water supply device 25 is used to supply water to the electrolysis hydrogen production unit. During peak-shaving periods of the nuclear power unit, when the power generation exceeds the grid demand, the excess electrical energy has nowhere to be utilized. The electrolysis hydrogen production unit utilizes this excess electrical energy to perform water electrolysis to produce hydrogen, converting electrical energy into chemical energy stored in hydrogen gas, thereby achieving effective utilization of excess electrical energy. Specifically, the input end of the DC power supply 22 is connected to the generator outlet power take-off system 3 or the external power grid to provide a stable power supply for the entire hydrogen production process. Its output end is connected to the electrolyzer 21 to deliver electrical energy to the electrolyzer 21. The electrolyzer 21 is the core of the chemical reaction for hydrogen production. Under the action of DC power, water is electrolyzed to produce hydrogen and oxygen. The input end of the gas-liquid separation device 23 is connected to the outlet of the electrolyzer 21, which can quickly separate the gas and liquid produced by electrolysis to ensure the initial purification of hydrogen. The chiller 24 provides cooling for the electrolyzer 21 to ensure that the electrolysis process is carried out at a suitable temperature and to ensure the stable operation of the equipment. The water supply device 25 is used to supply water to the electrolysis hydrogen production unit.

[0029] The existence of the electrolysis hydrogen production unit brings dual benefits. On the one hand, it effectively absorbs the excess electricity generated by nuclear power units during peak shaving periods, improves energy utilization efficiency, and reduces energy waste. On the other hand, the produced hydrogen, as a clean energy source, has advantages such as high energy density and pollution-free combustion products, providing important hydrogen energy for other industries such as chemical and energy sectors, and promoting the green development of related industries.

[0030] Electrolytic cell 21 is one of the following: alkaline electrolytic cell, proton exchange membrane electrolytic cell, anion exchange membrane electrolytic cell, or solid oxide electrolytic cell. For example... Figure 4 As shown, the electrolyzer 21 includes a bipolar plate 211, a cathode electrode 212, a diaphragm 213, an anode electrode 214, a gasket 215, and a fastening screw 216. The bipolar plate 211, cathode electrode 212, diaphragm 213, anode electrode 214, and gasket 215 are stacked and fixed together by the fastening screw 216 to form an electrolysis chamber. The electrolyzer 21 is provided with an electrolyte inlet 217 and an electrolysis gas outlet 218. The electrolyte enters the electrolysis chamber through the electrolyte inlet 217, and the gas produced by electrolysis is discharged from the electrolysis gas outlet 218. This structure allows the electrolyzer 21 to have a compact size and high power density, enabling large-scale hydrogen production within a limited space. The bipolar plate 211 is made of a special corrosion-resistant metal material with a finely coated surface, which not only has good conductivity but also effectively resists electrolyte corrosion, extending the service life of the electrolyzer 21. The cathode electrode 212 and the anode electrode 214 are made of high-performance catalytic materials, which can significantly reduce the overpotential of the electrolysis reaction, improve the electrolysis efficiency, and reduce energy consumption.

[0031] The electrolytic hydrogen production unit also includes a purification device 26 and a buffer device 27. The input end of the purification device 26 is connected to the gas outlet of the gas-liquid separator 23 for purifying the generated hydrogen. The buffer device 27 is located at the output end of the purification device 26 for storing the purified hydrogen. The buffer device 27 is equipped with a pressure monitoring device and a safety valve. The pressure monitoring device is used to monitor the pressure inside the buffer device 27 in real time, and the safety valve is used to automatically release pressure when the pressure exceeds a preset value.

[0032] In summary, this invention focuses on the utilization and conversion of peak-shaving thermal and electrical energy from nuclear power turbines. By adding a seawater screening and low-temperature distillation system 1 and a variable load system 2 to the third loop of the nuclear power unit, it achieves the recovery of heat from the second loop and the co-production of hydrogen, oxygen, and freshwater. While improving the overall thermal efficiency of the nuclear power unit, it reduces waste heat discharged into the sea, lowers the 4-degree Celsius temperature rise zone, maintains the unit at full capacity during peak-shaving periods, reduces personnel intervention, and ensures equipment and unit safety. Simultaneously, it breaks through the limitations of existing nuclear power peak-shaving modes, achieving breakthroughs in power reduction limits and low-power operation durations, increasing the nuclear power unit's ability to participate in peak-shaving, enabling long-term full-power operation, and recovering waste heat from the third loop, significantly improving the overall thermal efficiency of nuclear power, reducing nuclear fuel waste, and lowering nuclear power operating costs.

[0033] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A device for enhancing the peak-shaving capacity of a nuclear power unit using seawater in a three-loop nuclear power system, characterized in that, It includes a seawater screening and low-temperature distillation system (1), a variable load system (2), a generator outlet power take-off system (3), a steam turbine generator steam take-off system (4), and a control system; The seawater screening and low-temperature distillation system (1) is installed on the nuclear power plant's third loop and is used to recover the waste heat in the nuclear power plant's third loop and produce fresh water. The variable load system (2) is installed on the nuclear power third loop to absorb excess electrical energy during the peak shaving period of the nuclear power unit; The generator outlet power take-off system (3) is set on the line between the power plant generator outlet of the nuclear power unit and the step-up station. It is used to export excess peak-shaving power and supply the power to the seawater screening low-temperature distillation system (1) and the variable load system (2). One end of the steam turbine generator steam extraction system (4) is connected to the low-temperature waste steam and extraction steam conveying section of the nuclear power plant's secondary loop; The control system is communicatively connected to the seawater screening and low-temperature distillation system (1), the variable load system (2), the generator outlet power take-off system (3), and the steam turbine generator steam take-off system (4).

2. The device for enhancing the peak-shaving capacity of a nuclear power unit using seawater in a three-loop nuclear power system according to claim 1, characterized in that, The seawater screening and low-temperature distillation system (1) includes a seawater screening unit (11), a low-temperature distillation unit (12), and a freshwater storage unit (13). The seawater screening unit (11) is used to filter impurities in seawater, and its input end is connected to the seawater transmission pipeline of the nuclear power plant's third loop. The input end of the low-temperature distillation unit (12) is connected to the output end of the seawater screening unit (11), and the waste heat of the nuclear power third loop is used to distill the screened seawater. The input end of the freshwater storage unit (13) is connected to the freshwater output end of the low-temperature distillation unit (12) for storing the co-produced freshwater.

3. The device for enhancing the peak-shaving capacity of a nuclear power unit using seawater in a three-loop nuclear power system according to claim 2, characterized in that, The freshwater storage unit (13) is equipped with a water level monitoring device and a water quality testing device. The water level monitoring device is used to monitor the amount of freshwater stored in real time, and the water quality testing device is used to test the water quality of the freshwater.

4. The device for enhancing the peak-shaving capacity of a nuclear power unit using seawater in a three-loop nuclear power system according to claim 1, characterized in that, The variable load system (2) includes at least one of an energy storage module and an on-site power conversion module; The energy storage module includes at least one of a thermal energy storage unit, an electrochemical energy storage unit, and a physical energy storage unit. The on-site power conversion module includes at least one of a thermal seawater desalination unit and an electrolytic hydrogen production unit.

5. The device for enhancing the peak-shaving capacity of a nuclear power unit using seawater in a three-loop nuclear power system according to claim 4, characterized in that, The variable load system (2) includes at least one of the electrolysis hydrogen production units, each of which includes an electrolyzer (21), a DC power supply (22), a gas-liquid separation device (23), a chiller (24), and a water conveying device (25). The input terminal of the DC power supply (22) is connected to the generator outlet power take-off system (3), or connected to the external power grid through a rectifier device, and the output terminal of the DC power supply (22) is connected to the electrolytic cell (21). The input end of the gas-liquid separation device (23) is connected to the outlet of the electrolytic cell (21) for separating the gas and liquid generated by electrolysis; The chiller (24) is used to provide cooling for the electrolytic cell (21); The water supply device (25) is used to supply water to the electrolytic hydrogen production unit.

6. The device for enhancing the peak-shaving capacity of a nuclear power unit using seawater in a three-loop nuclear power system according to claim 5, characterized in that, The electrolytic cell (21) is one of the following: alkaline electrolytic cell, proton exchange membrane electrolytic cell, anion exchange membrane electrolytic cell, and solid oxide electrolytic cell.

7. The device for enhancing the peak-shaving capacity of a nuclear power unit using seawater in a three-loop nuclear power system according to claim 5, characterized in that, The electrolytic cell (21) includes a bipolar plate (211), a cathode electrode (212), a diaphragm (213), an anode electrode (214), a gasket (215), and a fastening screw (216); the bipolar plate (211), cathode electrode (212), diaphragm (213), anode electrode (214), and gasket (215) are stacked and fixed by the fastening screw (216) to form an electrolytic chamber; The electrolytic cell (21) is provided with an electrolyte inlet (217) and an electrolytic gas outlet (218). The electrolyte enters the electrolysis chamber through the electrolyte inlet (217), and the gas generated by electrolysis is discharged from the electrolytic gas outlet (218).

8. The device for enhancing the peak-shaving capacity of a nuclear power unit using seawater in a three-loop nuclear power system according to claim 5, characterized in that, The electrolytic hydrogen production unit also includes a purification device (26) and a buffer device (27). The input end of the purification device (26) is connected to the gas outlet of the gas-liquid separation device (23) for purifying the generated hydrogen. The buffer device (27) is located at the output end of the purification device (26) and is used to store the purified hydrogen.

9. The device for enhancing the peak-shaving capacity of a nuclear power unit using seawater in a three-loop nuclear power system according to claim 8, characterized in that, The buffer device (27) is equipped with a pressure monitoring device and a safety valve; The pressure monitoring device is used to monitor the pressure inside the buffer device (27) in real time; The safety valve is used to automatically release pressure when the pressure exceeds a preset value.

Images