Hydrogen production system of nuclear power station

Abstract

The utility model belongs to the technical field of comprehensive utilization of nuclear energy, and discloses a hydrogen production system of a nuclear power station. Comprising a nuclear power unit, an energy storage unit and a hydrogen production unit, the nuclear power unit comprises a steam generator, an air cylinder and a first generator, a steam outlet of the steam generator is communicated with a steam inlet of the air cylinder, and a rotor of the air cylinder is in transmission connection with the input end of the first generator; the energy storage unit is electrically connected with the first generator, and the energy storage unit can store electric energy generated by the first generator; and the hydrogen production unit is electrically connected with the first generator and the energy storage unit. According to the utility model, the problems that a large amount of stable, clean and efficient nuclear energy electric power is lost due to peak regulation pressure of a nuclear power station, and safe, continuous and stable operation of a hydrogen production device cannot be ensured by pure nuclear power abandoned electricity hydrogen production or pure nuclear power abandoned electricity storage possibly cannot be consumed by a power grid are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to nuclear energy comprehensive utilization technical field especially relates to a nuclear power plant hydrogen production system. BACKGROUND

[0002] With the increasing proportion of domestic wind, light and other new energy power generation, these energy has the characteristics of intermittency and volatility, and its power generation output is unstable, which leads to the increasingly strong requirement of power grid on the peak shaving of nuclear power units. At present, the nuclear power station that can adjust power in China has begun to operate in peak shaving, and the peak shaving frequency is becoming more and more frequent.

[0003] Taking a domestic third-generation pressurized water nuclear power plant as an example, the rated electric power of a single nuclear power unit is 1250MW. Under the condition of 1 daily peak shaving, 6 hours of peak shaving time and 80% of peak shaving depth, the daily power loss is as high as 1500MW.h. This not only makes the nuclear power station running at reduced power suffer huge economic losses, but also causes great impact on the nuclear safety of the nuclear power unit which requires stable operation as much as possible.

[0004] At the same time, in the field of energy, hydrogen energy has many advantages such as high energy density, high calorific value, abundant reserves, wide sources, high conversion efficiency and flexible utilization, and is a clean secondary energy. It is also one of the effective solutions for nuclear energy to realize large-scale cross-regional transfer application. Nuclear energy high-temperature water vapor electrolysis hydrogen production is to use the low-temperature steam (150℃-200℃) produced by the nuclear power station as the raw material for hydrogen production, heat it to about 750℃ by heating again, and then send it into the high-temperature electrolysis device for electrolysis to obtain hydrogen. The whole electrolysis process is powered by nuclear power station, and the heat energy of the high-temperature hydrogen and oxygen after electrolysis is recovered. Compared with the normal temperature electrolysis alkaline water hydrogen production and proton exchange membrane electrolysis hydrogen production technology, the high-temperature water vapor electrolysis hydrogen production saves about 45% and 25% of energy consumption, which is the most ideal hydrogen production way for pressurized water reactor nuclear power station at present. However, since the generation of nuclear power abandoned electricity is unstable, it may be interrupted at any time with the change of power grid demand. If the high-temperature electrolysis hydrogen production device is directly connected to the power generated by the nuclear power station for hydrogen production, it will make the hydrogen production device unable to obtain continuous and stable power supply, and it is difficult to ensure long-term safe and continuous stable operation.

[0005] In addition, the liquefied air energy storage technology is derived from air compression energy storage, which has the characteristics of large energy storage density, large energy storage scale but small occupation area, long energy storage time and zero carbon emission. Although the pure liquefied air energy storage combined with nuclear power station can store the huge power of power grid peak shaving, under the full power operation condition of nuclear power unit, the peak shaving power stored by energy storage may face the risk of being unable to be absorbed by power grid.

[0006] The existing nuclear power plant is faced with heavy peak regulation pressure, obvious nuclear power abandonment trend and the like, resulting in loss of a large amount of stable, clean and efficient nuclear power. Purely using nuclear power to abandon electricity to produce hydrogen cannot guarantee long-time safe and continuous stable operation of the hydrogen production device, and the purely stored nuclear power may face the situation of being unable to be consumed by the power grid again after being stored. Practical new type content

[0007] The utility model discloses a nuclear power plant hydrogen production system, aiming at solving the problems of loss of a large amount of stable, clean and efficient nuclear power due to the peak regulation pressure of the nuclear power plant, and the problem of being unable to be consumed by the power grid after the purely stored nuclear power is stored.

[0008] To achieve this purpose, the utility model adopts the following technical scheme:

[0009] A nuclear power plant hydrogen production system, comprising: a nuclear unit, an energy storage unit and a hydrogen production unit;

[0010] The nuclear unit comprises a steam generator, a cylinder and a first generator, a steam outlet of the steam generator is communicated with a steam inlet of the cylinder, and a rotor of the cylinder is drivingly connected with an input end of the first generator;

[0011] The energy storage unit is electrically connected with the first generator, and the energy storage unit can store the electric energy generated by the first generator;

[0012] The hydrogen production unit is electrically connected with the first generator and the energy storage unit.

[0013] Preferably, the cylinder comprises a high-pressure cylinder and a low-pressure cylinder, a first steam outlet of the high-pressure cylinder is communicated with a steam inlet of the low-pressure cylinder, and a rotor of the high-pressure cylinder is drivingly connected with a rotor of the low-pressure cylinder.

[0014] Preferably, the nuclear unit further comprises a water storage tank, a first water pump and a first heat exchanger, a water inlet of the first water pump is communicated with the water storage tank, a water outlet of the first water pump is communicated with an inlet of the first heat exchanger, a second steam outlet of the high-pressure cylinder is communicated with the first heat exchanger, and a first outlet of the first heat exchanger is communicated with a hydrogen raw material inlet of the hydrogen production unit.

[0015] Preferably, the nuclear unit further comprises a second water pump and a condenser, a steam outlet of the low-pressure cylinder is communicated with a first steam inlet of the condenser, an outlet of the condenser is communicated with the steam generator through the second water pump, and a second outlet of the first heat exchanger is communicated with a second steam inlet of the condenser.

[0016] Preferably, the nuclear power unit further comprises a first reheater, a steam outlet of the high-pressure cylinder is in communication with a steam inlet of the first reheater, and a steam outlet of the first reheater is in communication with a steam inlet of the low-pressure cylinder.

[0017] Preferably, the energy storage unit comprises a motor, a compressor, a cooler, a second reheater, an energy storage assembly, a cold accumulator, an expansion refrigerator, a first gas-liquid separator, a liquid air tank, a liquid air pump, an expander, and a second generator, an output end of the motor is drivingly connected to an input end of the compressor, an outlet of the compressor is in communication with an inlet of the cooler, an outlet of the cooler is in communication with an inlet of the cold accumulator, an outlet of the cold accumulator is in communication with an inlet of the expansion refrigerator, an outlet of the expansion refrigerator is in communication with an inlet of the first gas-liquid separator, an overflow port of the first gas-liquid separator is in communication with the cold accumulator, a bottom flow port of the first gas-liquid separator is in communication with an inlet of the liquid air tank, an outlet of the liquid air tank is in communication with an inlet of the liquid air pump, an outlet of the liquid air pump is in communication with the cold accumulator, the cold accumulator is connected to the second reheater, the second reheater is connected to the cooler through the energy storage assembly, the cooler is connected to the second reheater through the energy storage assembly, the second reheater is in communication with the expander, and the expander is drivingly connected to the second generator.

[0018] Preferably, a plurality of compressors are provided, and the motor is drivingly connected to the plurality of compressors.

[0019] Preferably, a plurality of second reheaters and a plurality of expanders are provided, one of the second reheaters is connected to one of the expanders in a first stage, and the cold accumulator is connected in series to the plurality of second reheaters and the plurality of expanders in multiple stages.

[0020] Preferably, the hydrogen production unit comprises an electric heater and a hydrogen production module, the nuclear power unit and the energy storage unit are electrically connected to the electric heater, and the electric heater transmits high-temperature water vapor to the hydrogen production module.

[0021] Preferably, the hydrogen production unit further comprises a second heat exchanger and a third heat exchanger, a cathode side of the hydrogen production module is in communication with the second heat exchanger, an anode side of the hydrogen production module is in communication with the third heat exchanger, outdoor air flows into the anode side of the hydrogen production module through the third heat exchanger, and the third heat exchanger is used for heat exchange between the outdoor air and high-temperature oxygen generated at the anode side of the hydrogen production module.

[0022] Advantages:

[0023] The utility model provides a kind of nuclear power plant hydrogen production system, utilize nuclear unit, energy storage unit, hydrogen production unit three units to carry out joint hydrogen production, the power generated by nuclear unit is excepted to municipal power grid, another part is distributed to energy storage unit and hydrogen production unit according to grid peak shaving demand, when receiving grid peak shaving instruction, the power after peak shaving can be directly supplied to energy storage unit storage and hydrogen production unit carries out hydrogen production, when nuclear power plant is not peak shaving, energy storage unit starts energy release process and provides hydrogen production power for hydrogen production unit, solve the problem that nuclear power plant faces peak shaving pressure, thereby make a large number of output stable, clean and efficient nuclear power loss and simply with nuclear power abandoned electricity hydrogen production cannot guarantee that hydrogen production device is safely continuously and stably operated or simply after storing nuclear power abandoned electricity, possibly face the problem that cannot be absorbed by grid, also greatly improve the economic benefit of the nuclear power station of power reduction abandoned electricity operation. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the flow chart of the nuclear power plant hydrogen production system;

[0025] In the figure:

[0026] 1, nuclear unit;11, steam generator;12, cylinder;121, high-pressure cylinder;122, low-pressure cylinder;13, first generator;14, first reheater;15, water storage tank;161, first water pump;162, second water pump;17, first heat exchanger;18, first transformer;19, condenser;

[0027] 2, energy storage unit;201, motor;202, compressor;2031, cooler;2032, second reheater;204, energy storage assembly;2041, heat storage tank;2042, cold storage tank;205, cold accumulator;206, expansion refrigerator;207, first gas-liquid separator;208, liquid air storage tank;209, liquid air pump;210, expander;211, second generator;

[0028] 3, hydrogen production unit;31, second heat exchanger;32, electric heater;33, hydrogen production module;34, second gas-liquid separator;35, dryer;36, third heat exchanger;

[0029] 4, second transformer;5, rectifier. DETAILED DESCRIPTION

[0030] The utility model makes further detailed explanation in combination with the drawings and embodiment below.It can be understood that the specific embodiment described here is only used to explain the utility model, and is not limited to the utility model.In addition, it needs to be explained that, in order to facilitate description, only part related to the utility model is shown in the drawing, not all structures.

[0031] In the description of the utility model, unless another definite provision and limitation, the term "link", "connection", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through the indirect connection of intermediate medium, can be two elements internal communication or two element mutual action relation. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the direct contact of the first and second features, also can include the contact of the first and second features not direct contact but through the contact between other features between them. Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature. The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0033] In the description of the embodiment, the orientation or position relationship of the terms "on", "under", "right", etc. is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0034] As Figure 1As shown, the embodiment provides a nuclear power plant hydrogen production system, which comprises a nuclear power unit 1, an energy storage unit 2 and a hydrogen production unit 3, wherein the nuclear power unit 1 comprises a steam generator 11, a cylinder 12 and a first generator 13, wherein the cylinder 12 comprises a high-pressure cylinder 121 and a low-pressure cylinder 122, the steam generator 11 generates high-temperature and high-pressure steam, the steam outlet of the steam generator 11 is in communication with the steam inlet of the high-pressure cylinder 121, the steam in the high-pressure cylinder 121 drives the rotation of the rotor of the high-pressure cylinder 121, the first steam outlet of the high-pressure cylinder 121 is in communication with the steam inlet of the low-pressure cylinder 122, part of the steam after work is transported into the low-pressure cylinder 122 to continue to work, the rotor of the high-pressure cylinder 121 and the rotor of the low-pressure cylinder 122 are connected through a shaft coupling, to ensure the transmission of power, the steam in the low-pressure cylinder 122 drives the rotation of the rotor of the low-pressure cylinder 122, the rotor of the low-pressure cylinder 122 and the input end of the first generator 13 are also connected through a shaft coupling, to drive the first generator to generate electricity; the energy storage unit 2 is electrically connected with the first generator 13, and the energy storage unit 2 can store the electricity generated by the first generator 13; the hydrogen production unit 3 is electrically connected with the first generator 13 and the energy storage unit 2, and the hydrogen production raw material inlet of the hydrogen production unit 3 is in communication with the second steam outlet of the high-pressure cylinder 121; the electricity generated by the nuclear power unit 1 is connected to the municipal power grid, and another part is distributed to the energy storage unit 2 and the hydrogen production unit 3 according to the grid peak shaving demand, when the grid peak shaving instruction is received, the electricity after peak shaving can be directly supplied to the energy storage unit 2 for storage and the hydrogen production unit 3 for hydrogen production, when the nuclear power plant is not peak shaving, the energy storage unit 3 starts the energy release process to provide hydrogen production electricity for the hydrogen production unit 2, so that the long-time continuous and stable hydrogen production of the nuclear power plant by using the peak shaving electricity is ensured, and the difficulty that the grid cannot absorb the electricity of the pure energy storage is overcome, on the other hand, the sale of hydrogen also greatly improves the economic benefit of the nuclear power plant running at a low power and abandoning electricity.

[0035] Preferably, in order to prevent the radioactive overflow of nuclear fuel to the outside of the nuclear power plant and ensure the nuclear safety of the hydrogen production unit, the nuclear power unit 1 is provided with an isolation heat exchange loop, which comprises a water storage tank 15, a first water pump 161 and a first heat exchanger 17, the water inlet of the first water pump 161 is in communication with the water storage tank 15, the water outlet of the first water pump 161 is in communication with the inlet of the first heat exchanger 17, the second steam outlet of the high-pressure cylinder 121 is in communication with the first heat exchanger 17, the first outlet of the first heat exchanger 17 is in communication with the hydrogen production raw material inlet of the hydrogen production unit 3, the first water pump 161 extracts desalted sea water from the water storage tank 15 and sends it into the first heat exchanger 17, part of the steam extracted from the high-pressure cylinder 121 is transported into the first heat exchanger 17, in the first heat exchanger 17, the desalted sea water is heated into 150-200℃ water vapor by using the exhaust gas which has done work in the high-pressure cylinder 121, and the water vapor is transported to the hydrogen production unit 3 as hydrogen production raw material, which conforms to the principle of energy cascade utilization, further improves the energy utilization efficiency of the system, and also ensures the nuclear safety of the hydrogen production unit 3.

[0036] Since a large amount of desalinated seawater is consumed for nuclear energy hydrogen production, a nuclear energy seawater desalination device can be arranged in front of the water storage tank 15 in the isolated heat exchange loop, which not only ensures the supply of hydrogen production water vapor but also expands the application scenarios of nuclear energy comprehensive utilization.

[0037] Preferably, the nuclear power unit 1 further comprises a second water pump 162 and a condenser 19, the steam outlet of the low-pressure cylinder 122 is in communication with the first steam inlet of the condenser 19, and the steam discharged by the low-pressure cylinder 122 is condensed into water in the condenser 19. The outlet of the condenser 19 is in communication with the steam generator 11 through the second water pump 162, and the condensed water is sent back to the steam generator 11 to form a cycle. At the same time, the second outlet of the first heat exchanger 17 is in communication with the second steam inlet of the condenser 19, which can provide an additional steam source for the condenser 19.

[0038] Preferably, the nuclear power unit 1 further comprises a first reheater 14, the first steam outlet of the high-pressure cylinder 121 is in communication with the steam inlet of the first reheater 14, and the steam outlet of the first reheater 14 is in communication with the steam inlet of the low-pressure cylinder 122. Since the steam coming out of the high-pressure cylinder 121 contains a certain amount of water, the first reheater 14 can remove the water in the exhaust gas of the high-pressure cylinder 121, reduce the erosion of the blades in the low-pressure cylinder 122, and improve the cycle efficiency.

[0039] Preferably, the nuclear power station hydrogen production system further comprises a first transformer 18, a rectifier 5 and a second transformer 4, the nuclear power unit 1 is electrically connected with the first transformer 18, the first transformer 18 is electrically connected with the energy storage unit 2, the energy storage unit 2 is electrically connected with the hydrogen production unit 3 through the rectifier 5, the first transformer 18 is electrically connected with the hydrogen production unit through the rectifier, the first transformer 18 is used to adjust the voltage of the power generated by the nuclear power unit 1, so that it can match the voltage required by the energy storage unit 2 and the hydrogen production unit 3, and ensure its efficient operation. Since the hydrogen production unit 3 produces hydrogen by high-temperature electrolysis of water vapor, this method usually uses direct current, and the nuclear power unit 1 generates alternating current. The rectifier 5 is used to convert alternating current into direct current, so that the direction of current through the electrolytic cell always remains consistent, thereby stabilizing the hydrogen production process; the first generator 13 is electrically connected with the second transformer 4, and since the voltage output by the first generator 13 is generally medium or low voltage, the second transformer 4 is needed to step up the voltage before the power is output to the municipal power grid.

[0040] As Figure 1As shown, the energy storage unit 2 comprises a motor 201, a compressor 202, a cooler 2031, a second reheater 2032, an energy storage assembly 204, a cold accumulator 205, an expansion refrigerator 206, a first gas-liquid separator 207, a liquid air tank 208, a liquid air pump 209, an expander 210 and a second generator 211, the energy storage assembly 204 comprises a heat storage tank 2041 and a cold storage tank 2042, the nuclear power unit 1 is electrically connected with the motor 201, when the nuclear power station has excess power for peak shaving, the motor 201 is started, the output end of the motor 201 is in transmission connection with the input end of the compressor 202, the motor 201 drives the compressor 202 to work, air from the atmosphere is sucked into the compressor 202, the temperature and pressure of the air after compression are increased, the outlet of the compressor 202 is in communication with the inlet of the cooler 2031, the outlet of the cooler 2031 is in communication with the inlet of the cold accumulator 205, the air after cooling of the cooler 2031 flows into the cold accumulator 205, the outlet of the cold accumulator 205 is in communication with the inlet of the expansion refrigerator 206, the outlet of the expansion refrigerator 206 is in communication with the inlet of the first gas-liquid separator 207, the overflow port of the first gas-liquid separator 207 is in communication with the cold accumulator 205, in the cold accumulator 205, the cooled air exchanges heat with the cold air returned from the overflow port of the first gas-liquid separator 207, and the temperature is further reduced, the cooled air is cooled and decompressed by the expansion refrigerator 206, part of it is condensed into liquid, and part of it is still gas, the underflow port of the first gas-liquid separator 207 is in communication with the inlet of the liquid air tank 208, under the centrifugal separation of the first gas-liquid separator 207, the liquid air flows out from the underflow port to the liquid air tank 208 for storage, the gaseous air returns to the cold accumulator 205 from the overflow port to continue cooling the compressed air, and the compression heat generated in the compression process is stored in the heat storage tank 2041 through the cooler 2031.

[0041] Preferably, the compressor 202 is provided with a plurality of compressors 202, and the motor 201 is in transmission connection with the plurality of compressors 202; the compressor 202 is provided with multiple stages to reduce the compression ratio of each stage, so that the compression process is closer to isothermal compression, reduces the irreversible loss in the compression process, and improves the compression efficiency; at the same time, more stages can better control the airflow state and pressure change in the compression process; in addition, more stages can make the pressure change in the compression process more gentle, enhance the system stability, and also can compress the air to a higher pressure, improve the energy storage density. The number of stages of the compressor 202 is not limited here, and is usually 3-6, which is determined comprehensively according to the specific energy storage system demand, technical scheme and economic cost and other factors.

[0042] When the nuclear power plant does not need to be adjusted and needs to be full-load, the energy release process is started, the outlet of the liquid air storage tank 208 is communicated with the inlet of the liquid air pump 209, the outlet of the liquid air pump 209 is communicated with the cold accumulator 205, the liquid air pump 209 draws out the liquid air from the liquid air storage tank 208 and sends it into the cold accumulator 205 to absorb heat and gasify, the cold accumulator 205 is connected to the second reheater 2032, the reheater 2032 is connected to the cooler 2031 through the cold storage tank 2042, the cooler 2031 is connected to the second reheater 2032 through the heat storage tank 2041, the second reheater 2032 is communicated with the expander 210, the gasified air absorbs heat through the second reheater 2032 and the temperature rises, the cold energy absorbed by the second reheater 2032 is stored in the cold storage tank 2042, and then enters the expander 210 to do work, the expander 210 is drivingly connected with the second generator 211 to drive the second generator 211 to generate electricity, and the electricity generated by the second generator 211 is transmitted to the hydrogen production unit 3 for hydrogen production.

[0043] Preferably, the second reheater 2032 and the expander 210 are each provided with a plurality of levels, and the connection of one second reheater 2032 and one expander 210 is one level, the cold accumulator 205 is connected in series with the multiple levels of second reheaters 2032 and expanders 210, the multiple levels of second reheaters 2032 are mainly used for recovering and utilizing the energy in the system, so that the air reaches a suitable temperature and energy state before entering the expander 210, so as to match the working requirements of the expander 210, thereby improving the energy conversion efficiency of the entire energy storage unit 2; the multiple levels of expanders 210 can gradually release the energy of high-pressure air, and each level of expansion can more fully utilize the pressure energy of the gas to convert into mechanical energy, and at the same time, the multiple levels of expanders 210 can better adapt to high-pressure air, in addition, the multiple levels of expanders 210 can be used in cooperation with the multiple levels of compressors 202, so as to realize higher compression ratio and expansion ratio, and improve the energy storage density and energy output capacity of the energy storage unit 2.

[0044] As shown in Figure 1 The hydrogen production unit 3 includes an electric heater 32 and a hydrogen production module 33, the nuclear power unit 1 and the energy storage unit 2 are electrically connected with the electric heater 32, the electric heater 32 is heated to above 750℃ by the electricity provided by the nuclear power unit 1 and the energy storage unit 2, the electric heater 32 transmits the high-temperature water vapor to the hydrogen production module 33, and a high-temperature electrolysis reaction is carried out in the hydrogen production module 33, hydrogen is electrolyzed on the cathode side, and oxygen is electrolyzed on the anode side.

[0045] Preferably, the hydrogen production unit 3 also includes a second heat exchanger 31 and a third heat exchanger 36. The second heat exchanger 31 is used to receive the high-temperature water vapor transmitted by the first heat exchanger 17 and heat it once. The outlet of the second heat exchanger 31 is connected to the inlet of the electric heater 32. The cathode side of the hydrogen production module 33 is connected to the second heat exchanger 31. The high-temperature hydrogen generated on the cathode side can be heat-exchanged and cooled in the second heat exchanger 31. At the same time, it can also heat the high-temperature water vapor transmitted by the first heat exchanger 17, thereby improving the energy utilization efficiency. The anode side of the hydrogen production module 33 is connected to the third heat exchanger 36. The outdoor air passes through the third heat exchanger 36 to exchange heat with the high-temperature oxygen generated on the anode side of the hydrogen production module. The outdoor air is heated to 600°C and then sent to the hydrogen production module On the anode side of block 33, since the reaction system needs to be maintained at a higher temperature to achieve higher efficiency during the high-temperature electrolysis of water vapor, the high-temperature oxygen generated on the anode side of the hydrogen production module 33 is used through the third heat exchanger 36 to preheat the low-temperature outdoor air, which can reduce the energy input required for subsequent heating, thereby improving the energy utilization efficiency of the entire system and reducing the energy consumption and cost of hydrogen production. On the other hand, the outdoor air can be heat exchanged through the third heat exchanger 36, which can also remove impurities that may be contained in the air, play a certain purification role, and reduce damage to the hydrogen production module 33. The high-temperature oxygen electrolyzed on the anode side of the hydrogen production module 33 can be reduced to below 200°C after heat exchange and blown to the outdoors, which also reduces thermal pollution to the environment to a certain extent.

[0046] Preferably, the hydrogen production unit 3 also includes a second gas-liquid separator 34 and a dryer 35. The cathode side of the hydrogen production module 33 is connected to the inlet of the second gas-liquid separator 34 through the second heat exchanger 31. The crude hydrogen completes the heat exchange in the second heat exchanger 31 and the temperature drops to about 150°C before entering the second gas-liquid separator 34. The overflow port of the second gas-liquid separator 34 is connected to the inlet of the dryer 35. The hydrogen after gas-liquid separation enters the dryer 35 for drying treatment to become high-purity, room-temperature hydrogen, which is finally used for hydrogen energy through storage and transportation.

[0047] The nuclear power plant hydrogen production system proposed in this utility model patent has the following significant advantages:

[0048] By setting up the energy storage unit 2 and the hydrogen production unit 3, when the power grid needs peak regulation, the peak-shaving power of the nuclear power plant can be directly used for hydrogen production and storage; when the power grid does not need peak regulation, the energy storage unit 2 provides the power required for hydrogen production. This ensures that the nuclear power plant participates in the peak regulation of the power grid without reducing power, and realizes efficient use of energy.

[0049] This utility model patent has broad application prospects and market value, and provides a new technical solution for promoting the development of clean energy and the comprehensive utilization of nuclear energy.

[0050] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. A nuclear power plant hydrogen production system, characterized by, The application relates to a nuclear power unit (1), an energy storage unit (2) and a hydrogen production unit (3). The nuclear power unit (1) comprises a steam generator (11), a cylinder (12) and a first generator (13), a steam outlet of the steam generator (11) is communicated with a steam inlet of the cylinder (12), and a rotor of the cylinder (12) is drivingly connected with an input end of the first generator (13). The energy storage unit (2) is electrically connected with the first generator (13), and the energy storage unit (2) can store the electric energy generated by the first generator (13). The hydrogen production unit (3) is electrically connected with the first generator (13) and the energy storage unit (2). The cylinder (12) comprises a high-pressure cylinder (121) and a low-pressure cylinder (122), a first steam outlet of the high-pressure cylinder (121) is communicated with a steam inlet of the low-pressure cylinder (122), and a rotor of the high-pressure cylinder (121) is drivingly connected with a rotor of the low-pressure cylinder (122).

2. The nuclear power plant hydrogen production system of claim 1, wherein, The nuclear power unit (1) further comprises a water storage tank (15), a first water pump (161) and a first heat exchanger (17), a water inlet of the first water pump (161) is communicated with the water storage tank (15), a water outlet of the first water pump (161) is communicated with an inlet of the first heat exchanger (17), a second steam outlet of the high-pressure cylinder (121) is communicated with the first heat exchanger (17), and a first outlet of the first heat exchanger (17) is communicated with a hydrogen production raw material inlet of the hydrogen production unit (3).

3. The nuclear power plant hydrogen production system of claim 2, wherein, The nuclear power unit (1) further comprises a second water pump (162) and a condenser (19), a steam outlet of the low-pressure cylinder (122) is communicated with a first steam inlet of the condenser (19), an outlet of the condenser (19) is communicated with the steam generator (11) through the second water pump (162), and a second outlet of the first heat exchanger (17) is communicated with a second steam inlet of the condenser (19).

4. The nuclear power plant hydrogen production system of claim 3, wherein, The nuclear power unit (1) further comprises a first reheater (14), the first steam outlet of the high-pressure cylinder (121) is communicated with a steam inlet of the first reheater (14), and a steam outlet of the first reheater (14) is communicated with the steam inlet of the low-pressure cylinder (122).

5. The nuclear power plant hydrogen production system of claim 2, wherein, ​ 6. The nuclear power plant hydrogen production system of claim 1, wherein, The energy storage unit (2) comprises a motor (201), a compressor (202), a cooler (2031), a second reheater (2032), an energy storage assembly (204), a cold accumulator (205), an expansion refrigerator (206), a first gas-liquid separator (207), a liquid air tank (208), a liquid air pump (209), an expander (210), and a second generator (211), the output end of the motor (201) is drivingly connected with the input end of the compressor (202), the outlet of the compressor (202) is communicated with the inlet of the cooler (2031), the outlet of the cooler (2031) is communicated with the inlet of the cold accumulator (205), the outlet of the cold accumulator (205) is communicated with the inlet of the expansion refrigerator (206), the outlet of the expansion refrigerator (206) is communicated with the inlet of the first gas-liquid separator (207), the overflow port of the first gas-liquid separator (207) is communicated with the cold accumulator (205), the underflow port of the first gas-liquid separator (207) is communicated with the inlet of the liquid air tank (208), the outlet of the liquid air tank (208) is communicated with the inlet of the liquid air pump (209), the outlet of the liquid air pump (209) is communicated with the cold accumulator (205), the cold accumulator (205) is connected with the second reheater (2032), the second reheater (2032) is connected with the cooler (2031) through the energy storage assembly (204), the cooler (2031) is connected with the second reheater (2032) through the energy storage assembly (204), the second reheater (2032) is communicated with the expander (210), and the expander (210) is drivingly connected with the second generator (211).

7. The nuclear power plant hydrogen production system of claim 6, wherein, The compressor (202) is provided with a plurality of compressors (202), and the motor (201) is drivingly connected with the plurality of compressors (202).

8. The nuclear power plant hydrogen production system of claim 6, wherein, The second reheater (2032) and the expander (210) are each provided with a plurality of second reheaters (2032) and expanders (210), one second reheater (2032) is connected with one expander (210) in one stage, and the cold accumulator (205) is connected with the plurality of second reheaters (2032) and expanders (210) in series.

9. The nuclear power plant hydrogen production system of claim 1, wherein, The hydrogen production unit (3) comprises an electric heater (32) and a hydrogen production module (33), the nuclear power unit (1) and the energy storage unit (2) are electrically connected with the electric heater (32), and the electric heater (32) transmits high-temperature water vapor to the hydrogen production module (33).

10. The nuclear power plant hydrogen production system of claim 9, wherein, The hydrogen production unit (3) further comprises a second heat exchanger (31) and a third heat exchanger (36), the cathode side of the hydrogen production module (33) is communicated with the second heat exchanger (31), the anode side of the hydrogen production module (33) is communicated with the third heat exchanger (36), outdoor air flows into the anode side of the hydrogen production module (33) through the third heat exchanger (36), and the third heat exchanger (36) is used for heat exchange between outdoor air and high-temperature oxygen generated at the anode side of the hydrogen production module (33).

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