A seawater electrolysis hydrogen production system and method

Abstract

The application provides a seawater electrolysis hydrogen production system and method, and the system comprises a sand setting and coagulation pretreatment device, an MVR evaporator, a heat exchanger, an ion exchange membrane device and a water electrolysis hydrogen production equipment, seawater is introduced into the sand setting and coagulation pretreatment device to remove suspended solids in the seawater; the seawater from which the suspended solids are removed is introduced into the MVR evaporator to obtain high-temperature steam and brine; the high-temperature steam is introduced into the heat exchanger to be cooled and liquefied, and the obtained pure water is stored in a storage tank; the ion exchange membrane device converts the brine into pure water which is stored in the storage tank; and the water electrolysis hydrogen production equipment electrolyzes the pure water in the storage tank to produce hydrogen. The application combines the MVR evaporator with the water electrolysis hydrogen production equipment, utilizes the heat energy generated by the high-temperature steam discharged from the MVR evaporator to drive the water electrolysis hydrogen production reaction, thereby improving the hydrogen production efficiency, reducing the energy consumption of the water electrolysis hydrogen production system and lowering the cost of the seawater electrolysis hydrogen production system.

Description

Technical Field

[0001] This invention relates to the field of water electrolysis for hydrogen production technology, and more particularly to a seawater electrolysis hydrogen production system and method. Background Technology

[0002] Wind power generation is mainly divided into onshore wind power and offshore wind power. Due to the instability of offshore wind power generation frequency, offshore wind farms need to be equipped with energy storage devices to achieve peak shaving. Electrolysis of water to produce hydrogen for energy storage is a reasonable approach. Currently, water electrolysis hydrogen production equipment requires the influent water to reach ultrapure water quality, with a resistivity exceeding 1.0 × 10⁻⁶. 6 Ohm-cm. To meet the influent water quality requirements of equipment, a process route combining reverse osmosis (RO) and electrodeionization (EDI) is typically required when using drinking water as the source (compliant with GB5749-2006 Drinking Water Standard). Considering that offshore wind power equipment is surrounded by seawater, directly using seawater as the influent would impact current water purification equipment, reducing the quality of the effluent and its lifespan. Seawater desalination typically employs multi-stage flash evaporation, multi-effect distillation, and reverse osmosis membrane filtration, but these methods are relatively expensive, which is the primary reason hindering the continued development of seawater desalination technology. This is especially true for water electrolysis hydrogen production equipment; directly using conventional seawater purification processes to meet its influent requirements is even more costly. Furthermore, the operating temperature of water electrolysis for hydrogen production is above 80℃, requiring time to heat the water in the electrolyzer, thus reducing hydrogen production efficiency. Additionally, the high-temperature steam generated by the MVR evaporator is released into the atmosphere, not being effectively utilized. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art. To this end, embodiments of the present invention provide a seawater electrolysis hydrogen production system and method, which can reduce costs, improve hydrogen production efficiency, and reduce energy consumption.

[0004] One embodiment of this application proposes a seawater electrolysis hydrogen production system, comprising: a sedimentation and coagulation pretreatment device, an MVR evaporator, a heat exchanger, a seawater desalination device, and an electrolysis hydrogen production equipment. Seawater is introduced into the sedimentation and coagulation pretreatment device to remove suspended solids from the seawater; the seawater with suspended solids removed is introduced into the MVR evaporator to obtain high-temperature steam and brine; the high-temperature steam is introduced into the heat exchanger for cooling and liquefaction, and the resulting pure water is introduced into a storage tank for storage; the seawater desalination device desalinates the brine into pure water, which is then introduced into the storage tank for storage; the electrolysis hydrogen production equipment uses the pure water in the storage tank as raw material for electrolysis hydrogen production, wherein the temperature of the pure water is greater than or equal to 80°C.

[0005] This application combines an MVR evaporator with a water electrolysis hydrogen production device, using the heat energy generated by the high-temperature steam discharged from the MVR evaporator to drive the water electrolysis hydrogen production reaction, thereby improving hydrogen production efficiency and reducing the energy consumption of the water electrolysis hydrogen production system, and lowering the cost of using seawater electrolysis hydrogen production systems.

[0006] This application uses a heat exchanger to collect high-temperature steam generated by the MVR evaporator and liquefy the high-temperature steam into pure water at a temperature greater than 80°C, which can be directly used for electrolytic hydrogen production. This facilitates the rapid start-up of the water electrolysis hydrogen production equipment and can effectively improve the response speed and working efficiency of the water electrolysis hydrogen production equipment.

[0007] In some embodiments, the seawater desalination device is an ion exchange membrane device that allows only water molecules to pass through.

[0008] This application uses an ion exchange membrane device, which can generate high-concentration brine and high-temperature steam for recycling, and can also use the ion exchange membrane to convert the pure water needed for hydrogen production by water electrolysis.

[0009] In some embodiments, the temperature of the high-temperature steam is 150-200°C.

[0010] In some embodiments, the sedimentation and coagulation pretreatment device includes a sedimentation tank and a coagulation tank connected to each other, with the coagulation tank connected between the sedimentation tank and the MVR evaporator. By setting up the sedimentation tank and the coagulation tank, suspended solids in seawater can be effectively removed, preventing scaling, corrosion, and other phenomena from occurring inside the MVR evaporator.

[0011] In some embodiments, in the MVR evaporator, the time for the seawater to be converted into steam after removing suspended solids is less than 1 minute.

[0012] In some embodiments, a portion of the high-temperature steam discharged from the MVR evaporator is fed into a heat exchanger for cooling and liquefaction, while the remainder is fed into a storage tank to mix with pure water, making full use of the thermal energy of the high-temperature steam to maintain the temperature of the pure water above 80°C.

[0013] In some alternative embodiments, the storage tank is equipped with a heating and insulation device to maintain the temperature of the pure water inside the tank above 80°C. This ensures that the temperature of the pure water in the storage tank is maintained at or above 80°C when it is introduced into the water electrolysis hydrogen production equipment.

[0014] This application combines an MVR evaporator with an electrolytic water hydrogen production device, using the steam provided by the MVR evaporator to drive the electrolytic water hydrogen production reaction, thereby improving the efficiency of hydrogen production while reducing the energy consumption and production cost of the electrolytic water hydrogen production system.

[0015] In some embodiments, the high-concentration brine obtained by the ion exchange membrane device, wherein the concentration of the high-concentration brine is greater than 25%, is used to recover the generated crystalline salt through a recovery tank.

[0016] In some embodiments, the transmembrane power source for water molecules in the ion exchange membrane device is the continuous consumption of water by the water electrolysis hydrogen production equipment.

[0017] Another embodiment of this application proposes a method for producing hydrogen by seawater electrolysis, utilizing the aforementioned seawater electrolysis hydrogen production system, including the following steps:

[0018] S1, seawater is introduced into the sedimentation and coagulation pretreatment device to remove suspended solids from the seawater;

[0019] S2, Seawater with suspended solids removed is fed into an MVR evaporator to obtain brine and high-temperature steam. The brine is then fed into an ion exchange membrane device to obtain high-concentration brine and pure water. The pure water is stored in a storage tank, and the high-concentration brine is fed into a recovery tank to recover the generated crystalline salt.

[0020] A portion of the high-temperature steam is fed into a heat exchanger to cool and liquefy it, and the resulting pure water is fed into a storage tank for storage. The remaining portion of the high-temperature steam is fed into the storage tank to mix with the pure water, so that the temperature of the pure water in the storage tank is greater than 80°C.

[0021] S3, the pure water in the storage tank is fed into the water electrolysis hydrogen production equipment for electrolysis hydrogen production.

[0022] In this application, the method combines MVR technology with water electrolysis for hydrogen production. The heat energy generated by the high-temperature steam discharged from the MVR evaporator drives the water electrolysis reaction, thereby improving hydrogen production efficiency while reducing energy consumption and the cost of using seawater for hydrogen production. The resulting pure water at temperatures above 80°C can be directly used for hydrogen electrolysis, facilitating rapid start-up of the water electrolysis equipment and effectively improving its response speed and operating efficiency. Attached Figure Description

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings.

[0024] in:

[0025] Figure 1 This is a flowchart of the seawater electrolysis hydrogen production method in the embodiments of this application;

[0026] Figure label:

[0027] 1-Sedimentation and coagulation pretreatment device; 2-MVR evaporator; 3-Heat exchanger; 4-Ion exchange membrane device; 5-Storage tank; 6-Electrolysis water hydrogen production equipment; 7-Recovery tank. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] The seawater electrolysis hydrogen production system and method of the present invention are described below with reference to the accompanying drawings.

[0030] like Figure 1 As shown, one embodiment of this application proposes a seawater electrolysis hydrogen production system, including: a sedimentation and coagulation pretreatment device 1, an MVR evaporator 2, a heat exchanger 3, a seawater desalination device, and an electrolysis hydrogen production equipment 6. Seawater is introduced into the sedimentation and coagulation pretreatment device 1 to remove suspended solids from the seawater; the seawater with suspended solids removed is introduced into the MVR evaporator 2 to obtain high-temperature steam and brine.

[0031] A portion of the high-temperature steam discharged from the MVR evaporator 2 is fed into the heat exchanger 3 to cool and liquefy, and the resulting pure water is fed into the storage tank 5 for storage; the remaining portion of the high-temperature steam is fed into the storage tank 5 to mix with the pure water, making full use of the thermal energy of the high-temperature steam to maintain the temperature of the pure water above 80°C.

[0032] The seawater desalination unit desalinates brine into pure water, which is then stored in storage tank 5. The water electrolysis hydrogen production equipment 6 uses the pure water in storage tank 5 as raw material to electrolyze hydrogen, and the temperature of the pure water is greater than or equal to 80°C.

[0033] The pretreatment device 1 for sedimentation and coagulation includes a sedimentation tank and a coagulation tank connected to each other, with the coagulation tank connected between the sedimentation tank and the MVR evaporator 2. By setting up the sedimentation tank and the coagulation tank, suspended solids in seawater can be effectively removed, preventing scaling and corrosion in the MVR evaporator 2.

[0034] Sedimentation tanks remove larger or heavier suspended matter, silt, and other impurities from seawater through gravity settling or physical-chemical processes. In addition to removing solid suspended matter, sedimentation tanks can also remove some floating organic matter and grease. Sedimentation tanks play a role in pretreatment and protect subsequent processes.

[0035] Coagulation tanks use chemical methods to aggregate suspended particles (tiny particles) into larger particles, which are then separated from the water by gravity settling, thus removing impurities from the water. Coagulants often use metal ions such as iron and aluminum salts, which can cause fine suspended particles to form larger and denser flocs that settle rapidly under gravity.

[0036] The seawater desalination device is an ion exchange membrane device 4 that only allows water molecules to pass through; salts cannot pass through the ion exchange membrane. Using the ion exchange membrane device 4 allows for the generation of high-concentration brine and high-temperature steam for recycling, and also enables the conversion of the ion exchange membrane into pure water needed for hydrogen production via water electrolysis.

[0037] Specifically, the sedimentation tank is equipped with an inlet and an outlet. The inlet is for seawater, and the outlet is connected to the inlet of the coagulation tank via a pipeline. The outlet of the coagulation tank is connected to the inlet of the MVR evaporator 2 via a pipeline. The MVR evaporator 2 is equipped with a steam outlet and a brine outlet. The steam outlet of the MVR evaporator 2 is connected to a first pipeline and a second pipeline, respectively. The first pipeline is connected to the steam inlet of the heat exchanger 3. The heat exchanger 3 liquefies the incoming steam into high-temperature pure water, which is discharged to the storage tank 5 for storage and later use through the pure water outlet of the heat exchanger 3. The second pipeline is connected to the storage tank 5 and is used to heat the pure water in the storage tank 5 to keep the pure water temperature above 80°C.

[0038] The brine outlet of MVR evaporator 2 feeds brine into ion exchange membrane device 4. A recovery tank 7 is connected to the brine side of ion exchange membrane device 4 to recover the generated crystalline salt. Because the brine concentration on the brine side gradually increases, crystalline salt will form when the concentration exceeds 25%. The pure water from the ion exchange membrane is fed into storage tank 5 for storage and later use. The outlet of storage tank 5 is connected to the electrolysis cell of water electrolysis hydrogen production equipment 6 via a pipeline, allowing pure water at temperatures above 80°C to be directly used for hydrogen electrolysis.

[0039] This embodiment combines the MVR evaporator 2 with the water electrolysis hydrogen production equipment 6, using the heat energy generated by the high-temperature steam discharged from the MVR evaporator 2 to drive the water electrolysis hydrogen production reaction, thereby improving hydrogen production efficiency and reducing the energy consumption of the water electrolysis hydrogen production system, and lowering the cost of the seawater electrolysis hydrogen production system.

[0040] The MVR evaporator 2 used in this embodiment can significantly remove soluble solids (such as salts) from seawater, reducing the impact on conventional water purification equipment. It can also recover salts from seawater. After startup, the MVR evaporator 2 can rapidly vaporize room-temperature seawater (with suspended solids removed) into steam in less than one minute, with a steam temperature of 150-200°C.

[0041] This embodiment employs a heat exchanger 3, which collects the high-temperature steam generated by the MVR evaporator 2 and liquefies it into pure water at a temperature greater than 80°C. This pure water is then directly used for hydrogen electrolysis, facilitating the rapid start-up of the water electrolysis hydrogen production equipment 6 and effectively improving its response speed and operating efficiency. Room-temperature seawater can be used in the heat exchanger 3 to exchange heat with the high-temperature steam. When the lower-temperature pure water generated by the ion exchange membrane is introduced into the storage tank 5, the heat exchanger 3 automatically adjusts its heat exchange power to ensure that the water temperature in the storage tank 5 is greater than 80°C.

[0042] In some specific embodiments, the storage tank 5 may also be equipped with a heating and insulation device to maintain the temperature of the pure water in the storage tank 5 above 80°C. This ensures that the temperature of the pure water in the storage tank 5 is maintained at or above 80°C when it is introduced into the water electrolysis hydrogen production equipment 6.

[0043] It should be noted that, as mentioned above, the purpose of introducing a portion of the high-temperature steam into storage tank 5 to mix with the pure water is to heat storage tank 5, fully utilizing the thermal energy of the high-temperature steam to maintain the temperature of the pure water in storage tank 5 above 80°C. If high-temperature steam is not introduced into storage tank 5, a heating and insulation device can be installed on storage tank 5 to maintain the temperature of the pure water in storage tank 5 above 80°C, achieving the same effect. However, introducing high-temperature steam into storage tank 5 reduces costs compared to adding a heating and insulation device.

[0044] This application combines the MVR evaporator 2 with the water electrolysis hydrogen production equipment 6, and uses the steam provided by the MVR evaporator 2 to drive the water electrolysis hydrogen production reaction, thereby improving the efficiency of hydrogen production and reducing the energy consumption and production cost of the water electrolysis hydrogen production system.

[0045] In some specific embodiments, the transmembrane power source for water molecules in the ion exchange membrane device 4 is the continuous consumption of water by the water electrolysis hydrogen production device 6.

[0046] Another embodiment of this application proposes a method for producing hydrogen by seawater electrolysis, utilizing the aforementioned seawater electrolysis hydrogen production system, such as... Figure 1 As shown, it includes the following steps:

[0047] S1, seawater is introduced into the sedimentation and coagulation pretreatment device 1 to remove suspended solids from the seawater;

[0048] S2, Seawater with suspended solids removed is fed into MVR evaporator 2 to obtain brine and high-temperature steam. The brine is fed into ion exchange membrane device 4 to obtain high-concentration brine and pure water. The pure water is fed into storage tank 5 for storage, and the high-concentration brine is fed into recovery tank 7 to recover the generated crystallized salt.

[0049] A portion of the high-temperature steam is fed into heat exchanger 3 to cool and liquefy, and the resulting pure water is fed into storage tank 5 for storage. The remaining portion of the high-temperature steam is fed into storage tank 5 to mix with the pure water, so that the temperature of the pure water in storage tank 5 is greater than 80°C.

[0050] S3, the pure water in storage tank 5 is fed into the water electrolysis hydrogen production equipment 6 for electrolysis hydrogen production.

[0051] In this application, the method combines MVR technology with water electrolysis for hydrogen production. The heat energy generated by the high-temperature steam discharged from the MVR evaporator 2 drives the water electrolysis reaction, thereby improving hydrogen production efficiency and reducing energy consumption and cost of the seawater electrolysis system. The resulting pure water (above 80°C) can be directly used for hydrogen electrolysis, facilitating rapid start-up of the water electrolysis equipment 6 and effectively improving its response speed and operating efficiency. Under the same conditions, the system and method of this application produce better water quality, increase equipment operating efficiency by over 50%, and improve system response speed by over 60%.

[0052] The present application will be further illustrated by specific embodiments below.

[0053] Example 1

[0054] like Figure 1 As shown, a seawater electrolysis hydrogen production system includes: a sedimentation and coagulation pretreatment device 1, an MVR evaporator 2, a heat exchanger 3, an ion exchange membrane device 4, a storage tank 5, a recovery tank 7, and an electrolysis hydrogen production device 6. Seawater is passed into the sedimentation and coagulation pretreatment device 1 to remove suspended solids. The seawater with suspended solids removed is then passed into the MVR evaporator 2 to obtain high-temperature steam and brine.

[0055] A portion of the high-temperature steam discharged from the MVR evaporator 2 is fed into the heat exchanger 3 to cool and liquefy, and the resulting pure water is fed into the storage tank 5 for storage; the remaining portion of the high-temperature steam is fed into the storage tank 5 to mix with the pure water, making full use of the thermal energy of the high-temperature steam to maintain the temperature of the pure water above 80°C.

[0056] The ion exchange membrane in ion exchange membrane device 4 only allows water molecules to pass through; salts cannot. The driving force for water molecules to cross the membrane in ion exchange membrane device 4 is the continuous consumption of water by the water electrolysis hydrogen production device 6. Using ion exchange membrane device 4 allows for the generation of high-concentration brine and high-temperature steam for recycling, and also enables the conversion of brine into pure water needed for hydrogen production via water electrolysis. Ion exchange membrane device 4 converts brine into pure water, which is then stored in storage tank 5. The water electrolysis hydrogen production device 6 uses the pure water in storage tank 5 as raw material for hydrogen electrolysis; the temperature of the pure water is greater than or equal to 80℃.

[0057] The pretreatment device 1 for sedimentation and coagulation includes a sedimentation tank and a coagulation tank connected to each other, with the coagulation tank connected between the sedimentation tank and the MVR evaporator 2. By setting up the sedimentation tank and the coagulation tank, suspended solids in seawater can be effectively removed, preventing scaling and corrosion in the MVR evaporator 2.

[0058] Sedimentation tanks remove larger or heavier suspended matter, silt, and other impurities from seawater through gravity settling or physical-chemical processes. In addition to removing solid suspended matter, sedimentation tanks can also remove some floating organic matter and grease. Sedimentation tanks play a role in pretreatment and protect subsequent processes.

[0059] Coagulation tanks use chemical methods to aggregate suspended particles (tiny particles) into larger particles, which are then separated from the water by gravity settling, thus removing impurities from the water. Coagulants often use metal ions such as iron and aluminum salts, which can cause fine suspended particles to form larger and denser flocs that settle rapidly under gravity.

[0060] Specifically, the sedimentation tank is equipped with an inlet and an outlet. The inlet is for seawater, and the outlet is connected to the inlet of the coagulation tank via a pipeline. The outlet of the coagulation tank is connected to the inlet of the MVR evaporator 2 via a pipeline. The MVR evaporator 2 is equipped with a steam outlet and a brine outlet. The steam outlet of the MVR evaporator 2 is connected to a first pipeline and a second pipeline, respectively. The first pipeline is connected to the steam inlet of the heat exchanger 3. The heat exchanger 3 liquefies the incoming steam into high-temperature pure water, which is discharged to the storage tank 5 for storage and later use through the pure water outlet of the heat exchanger 3. The second pipeline is connected to the storage tank 5 and is used to heat the pure water in the storage tank 5 to keep the pure water temperature above 80°C.

[0061] The brine outlet of MVR evaporator 2 feeds brine into ion exchange membrane device 4. A recovery tank 7 is connected to the brine side of ion exchange membrane device 4 to recover the generated crystalline salt. Because the brine concentration on the brine side gradually increases, crystalline salt will form when the concentration exceeds 25%. The pure water from the ion exchange membrane is fed into storage tank 5 for storage and later use. The outlet of storage tank 5 is connected to the electrolysis cell of water electrolysis hydrogen production equipment 6 via a pipeline, allowing pure water at temperatures above 80°C to be directly used for hydrogen electrolysis.

[0062] This embodiment combines the MVR evaporator 2 with the water electrolysis hydrogen production equipment 6, using the heat energy generated by the high-temperature steam discharged from the MVR evaporator 2 to drive the water electrolysis hydrogen production reaction, thereby improving hydrogen production efficiency and reducing the energy consumption of the water electrolysis hydrogen production system, and lowering the cost of the seawater electrolysis hydrogen production system.

[0063] The MVR evaporator 2 used in this embodiment can significantly remove soluble solids (such as salts) from seawater, reducing the impact on conventional water purification equipment. It can also recover salts from seawater. After starting, the MVR evaporator 2 can rapidly vaporize room-temperature seawater (with suspended solids removed) into steam in less than one minute, with a steam temperature of 160°C.

[0064] This embodiment employs heat exchanger 3, which collects the high-temperature steam generated by MVR evaporator 2 and liquefies it into pure water at a temperature greater than 80°C. This pure water is then directly used for hydrogen electrolysis, facilitating the rapid start-up of the water electrolysis hydrogen production equipment 6 and effectively improving its response speed and operating efficiency. Room-temperature seawater can be used in heat exchanger 3 to exchange heat with the high-temperature steam. When the lower-temperature pure water generated by the ion exchange membrane is introduced into storage tank 5, heat exchanger 3 automatically adjusts its heat exchange power to ensure that the water temperature in storage tank 5 is greater than 80°C.

[0065] This embodiment combines the MVR evaporator 2 with the water electrolysis hydrogen production equipment 6, using the steam provided by the MVR evaporator 2 to drive the water electrolysis hydrogen production reaction, thereby improving the efficiency of hydrogen production and reducing the energy consumption and production cost of the water electrolysis hydrogen production system.

[0066] like Figure 1 As shown, this embodiment also proposes a method for producing hydrogen by seawater electrolysis, which specifically includes the following steps:

[0067] S1, seawater is introduced into the sedimentation and coagulation pretreatment device 1 to remove suspended solids from the seawater;

[0068] S2, Seawater with suspended solids removed is fed into MVR evaporator 2 to obtain brine and high-temperature steam. The brine is fed into ion exchange membrane device 4 to obtain high-concentration brine and pure water. The pure water is fed into storage tank 5 for storage, and the high-concentration brine is fed into recovery tank 7 to recover the generated crystalline salt.

[0069] A portion of the high-temperature steam is fed into heat exchanger 3 to cool and liquefy, and the resulting pure water is fed into storage tank 5 for storage. The remaining portion of the high-temperature steam is fed into storage tank 5 to mix with the pure water, so that the temperature of the pure water in storage tank 5 is greater than 80°C.

[0070] S3, the pure water in storage tank 5 is fed into the water electrolysis hydrogen production equipment 6 for electrolysis hydrogen production.

[0071] In this embodiment, the method combines MVR technology with water electrolysis for hydrogen production. The heat energy generated by the high-temperature steam discharged from the MVR evaporator 2 drives the water electrolysis reaction, thereby improving hydrogen production efficiency and reducing energy consumption and cost of using seawater for hydrogen production. The resulting pure water (above 80°C) can be directly used for hydrogen electrolysis, facilitating rapid start-up of the water electrolysis hydrogen production equipment 6 and effectively improving its response speed and operating efficiency. Under the same conditions, the system and method of this embodiment produce better water quality, increase equipment operating efficiency by over 50%, and improve system response speed by over 60%.

[0072] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0075] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0076] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A seawater electrolysis hydrogen production system, characterized in that, include: A sedimentation and coagulation pretreatment device is used to remove suspended solids from seawater by introducing seawater into the sedimentation and coagulation pretreatment device. In an MVR evaporator, seawater with suspended solids removed is introduced to produce high-temperature steam and brine. The high-temperature steam is introduced into the heat exchanger to cool and liquefy it, and the resulting pure water is then stored in a storage tank. A seawater desalination device that desalinates brine into pure water, which is then stored in a storage tank. An electrolytic water hydrogen production device, wherein the electrolytic water hydrogen production device uses pure water in a storage tank as raw material to electrolyze hydrogen, and the temperature of the pure water is greater than or equal to 80°C; The high-temperature steam discharged from the MVR evaporator is partially fed into a heat exchanger for cooling and liquefaction, while the remainder is fed into a storage tank to mix with pure water, maintaining the temperature of the pure water above 80°C. In the MVR evaporator, the time for the seawater to be converted into steam after removing suspended solids is less than 1 minute. The seawater desalination device is an ion exchange membrane device that only allows water molecules to pass through. The high-concentration brine obtained by the ion exchange membrane device has a concentration greater than 25%, and the generated crystalline salt is recovered through a recovery tank. The transmembrane power source for water molecules in the ion exchange membrane device is the continuous consumption of water by the water electrolysis hydrogen production equipment.

2. The seawater electrolysis hydrogen production system according to claim 1, characterized in that, The temperature of the high-temperature steam is 150-200℃.

3. The seawater electrolysis hydrogen production system according to claim 1, characterized in that, The sedimentation and coagulation pretreatment device includes a sedimentation tank and a coagulation tank connected to each other, with the coagulation tank connected between the sedimentation tank and the MVR evaporator.

4. The seawater electrolysis hydrogen production system according to claim 1, characterized in that, The storage tank is equipped with a heating and insulation device to maintain the temperature of the pure water inside the tank above 80°C.

5. A method for producing hydrogen by seawater electrolysis, characterized in that, The seawater electrolysis hydrogen production system according to any one of claims 1-4 includes the following steps: S1, seawater is introduced into the sedimentation and coagulation pretreatment device to remove suspended solids from the seawater; S2, Seawater with suspended solids removed is fed into an MVR evaporator to obtain brine and high-temperature steam. The brine is then fed into an ion exchange membrane device to obtain high-concentration brine and pure water. The pure water is stored in a storage tank, and the high-concentration brine is fed into a recovery tank to recover the generated crystalline salt. A portion of the high-temperature steam is fed into a heat exchanger to cool and liquefy it, and the resulting pure water is fed into a storage tank for storage. The remaining portion of the high-temperature steam is fed into the storage tank to mix with the pure water, so that the temperature of the pure water in the storage tank is greater than 80°C. S3, the pure water in the storage tank is fed into the water electrolysis hydrogen production equipment for electrolysis hydrogen production.

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