Offshore hydrogen production system

Abstract

Disclosed in the present invention is an offshore hydrogen production system, comprising a hydrogen production assembly. The hydrogen production assembly is configured to use seawater to produce hydrogen. The offshore hydrogen production system further comprises a liquefaction and storage assembly. The hydrogen production assembly is communicated with the liquefaction and storage assembly. The liquefaction and storage assembly is configured to liquefy hydrogen to liquid hydrogen and store the liquid hydrogen. The liquefaction and storage assembly comprises a low-temperature compression part and a liquid hydrogen storage tank. The low-temperature compression part is communicated with the liquid hydrogen storage tank. The low-temperature compression part is communicated with the hydrogen production assembly to convert gaseous hydrogen into liquid hydrogen. The liquid hydrogen storage tank is configured to store the liquid hydrogen. By means of the described configuration, an efficient energy conversion process for directly preparing hydrogen from seawater and liquefying the hydrogen to liquid hydrogen is achieved, thereby improving the utilization efficiency of energy, and also effectively reducing transportation costs by means of the low-temperature compression part and the liquid hydrogen storage tank in the liquefaction and storage assembly.

Description

offshore hydrogen production system Technical Field

[0001] This invention relates to a marine hydrogen production system. Background Technology

[0002] Hydrogen energy has garnered widespread global attention, becoming a crucial energy and industrial direction for addressing climate change and decarbonization. Compared to hydrogen production methods such as chlor-alkali byproduct gas, coke oven gas, and ethane cracking, utilizing renewable energy sources like seawater or freshwater electrolysis to produce hydrogen is more in line with the demands of modern development, ensuring a supply of green hydrogen energy. Furthermore, the world possesses abundant offshore wind, wave, and tidal energy resources, making direct hydrogen production from these renewable sources an environmentally friendly and energy-efficient technology.

[0003] Current technology allows for the production of gaseous hydrogen at sea. However, if the produced gaseous hydrogen is located far from land, it requires long-distance transportation. Currently, long-distance transportation of gaseous hydrogen utilizes either pipelines or the construction of high-pressure gas tanks. However, constructing pipelines requires significant manpower and financial resources, increasing transportation costs. High-pressure gas tanks, on the other hand, have relatively small capacities, necessitating the use of numerous tanks for storage, further increasing transportation costs.

[0004] Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the problems of high transportation cost of gaseous hydrogen and difficulty in grid connection of offshore renewable energy power plants in the prior art, and to provide an offshore hydrogen production system.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] This invention discloses a marine hydrogen production system, including a hydrogen production component for producing hydrogen using seawater. The marine hydrogen production system also includes a liquefaction storage component, which is connected to the hydrogen production component. The liquefaction storage component is used to liquefy hydrogen into liquid hydrogen and store the liquid hydrogen.

[0008] The liquefaction storage assembly includes a cryogenic compression section and a liquid hydrogen storage tank. The cryogenic compression section and the liquid hydrogen storage tank are connected. The cryogenic compression section is connected to the hydrogen production assembly to convert gaseous hydrogen into liquid hydrogen. The liquid hydrogen storage tank is used to store liquid hydrogen.

[0009] This solution employs the aforementioned method to achieve a highly efficient energy conversion process of directly producing hydrogen from seawater and liquefying it into liquid hydrogen. This not only improves energy utilization efficiency but also effectively addresses the safety and efficiency issues of hydrogen storage and transportation through the cryogenic compression section and liquid hydrogen storage tank in the liquefaction storage component. Specifically, the liquefaction storage component converts gaseous hydrogen into liquid hydrogen, significantly increasing the volumetric energy density of hydrogen. This allows a larger volume of hydrogen storage container to store more hydrogen, reducing transportation costs. Furthermore, this method increases the weight of the stored hydrogen, reducing the space required during storage and transportation. In addition, the liquid hydrogen storage tank reduces the infiltration of external heat, effectively controlling the evaporation loss of liquid hydrogen.

[0010] Preferably, the cryogenic compression unit includes a pressurizing pump, a compressor, and a cooling component, wherein the pressurizing pump, the compressor, and the cooling component are connected in sequence, the pressurizing pump is connected to the hydrogen production assembly, the pressurizing pump is used to increase the pressure of the hydrogen, the compressor is used to compress the hydrogen, and the cooling component is used to cool the hydrogen to convert gaseous hydrogen into liquid hydrogen.

[0011] In this scheme, the aforementioned configuration, through the orderly interconnection of a pressurizing pump, a compressor, and cooling components, achieves the efficient conversion of hydrogen from a gaseous to a liquid state. The pressurizing pump increases the pressure of the hydrogen, thereby reducing its volume and facilitating the subsequent cooling process to achieve the required low-temperature conditions for liquefaction. The compressor then further acts on the hydrogen, increasing its pressure by reducing its volume, thus lowering energy consumption and improving liquefaction efficiency. Finally, the cooling components lower the hydrogen temperature, promoting the phase transition from gaseous to liquid hydrogen. This process not only increases the volumetric energy density of hydrogen but also enhances its safe storage and transportation, thereby optimizing the hydrogen production and storage process and reducing energy consumption and costs.

[0012] Preferably, the marine hydrogen production system further includes a secondary liquefaction component, which is connected to the first outlet end of the liquid hydrogen storage tank and the inlet end of the cryogenic compression unit. The secondary liquefaction component is used to transfer liquefied gaseous hydrogen in the liquid hydrogen storage tank to the cryogenic compression unit.

[0013] In this solution, the above-mentioned form ensures that the gaseous hydrogen liquefied from the liquid hydrogen storage tank can be transferred to the cryogenic compression section, so that the gaseous hydrogen can be liquefied again through the cryogenic compression section.

[0014] Preferably, the secondary liquefaction component includes a connecting pipe for connecting the first outlet end of the liquid hydrogen storage tank and the inlet end of the cryogenic compression section.

[0015] In this solution, the above-mentioned form is used to connect the liquid hydrogen storage tank and the cryogenic compression unit through a connecting pipe, so that the liquefied gaseous hydrogen in the liquid hydrogen storage tank can enter the cryogenic compression unit through the connecting pipe, so that the gaseous hydrogen can be liquefied again by the cryogenic compression unit.

[0016] Preferably, the marine hydrogen production system further includes an external delivery component connected to the second outlet of the liquid hydrogen storage tank, the external delivery component being used to deliver liquid hydrogen stored in the liquid hydrogen storage tank;

[0017] In the vertical direction, the second outlet end is lower than the first outlet end.

[0018] In this solution, the density of the liquefied hydrogen is less than that of liquid hydrogen, and the height of the first outlet is higher than that of the second outlet. This also facilitates the flow of the liquefied hydrogen into the cryogenic compression section, thereby effectively avoiding potential safety hazards of liquefied hydrogen in the liquid hydrogen storage tank.

[0019] Preferably, the marine hydrogen production system further includes an export component connected to the outlet of the liquefaction storage component, the export component being used to transport liquid hydrogen stored in the liquid hydrogen storage tank.

[0020] In this solution, the liquid hydrogen stored in the liquid hydrogen storage tank is transported using the aforementioned method, ensuring a stable supply of liquid hydrogen throughout the entire process from production to use. Furthermore, through the connection of the external transport components, liquid hydrogen can smoothly transition from the storage stage to the transportation stage, facilitating its later use.

[0021] Preferably, the export component includes a first export section and an oil transport pipe, the two ends of which are connected and communicate with the liquefied storage component and the onshore storage component, respectively. The first export section is disposed on the oil transport pipe and is used to provide power for the transport of liquid hydrogen in the oil transport pipe.

[0022] Alternatively, the external delivery component includes a second external delivery section, a delivery pipe, and a first float assembly. The two ends of the delivery pipe are connected and communicate with the liquefaction storage component and the storage component of the first float assembly, respectively. The second external delivery section is disposed on the first float assembly and is used to provide power for the delivery of liquid hydrogen in the delivery pipe.

[0023] In this solution, the aforementioned configuration allows operators to select suitable delivery components based on the operating environment, expanding the application scenarios of the offshore hydrogen production system. Specifically, when the offshore hydrogen production system is far from the onshore storage component, liquid hydrogen can be transported to the storage component of the first floating assembly, and then transported ashore using the first floating assembly. In summary, the delivery pipeline and the first floating assembly improve the flexibility of liquid hydrogen transportation. When the offshore hydrogen production system is close to the onshore storage component, liquid hydrogen can be directly transported using pipelines used for transporting oil, reducing transportation costs.

[0024] Preferably, the marine hydrogen production system further includes a desalination unit connected to the inlet of the hydrogen production unit, the desalination unit being used to extract and desalinate the salt in seawater.

[0025] In this solution, the aforementioned design, using a desalination unit, reduces side reactions and corrosion problems during hydrogen production, thereby protecting the hydrogen production unit and extending its service life. Furthermore, this design also prevents impurities in seawater from affecting electrolysis efficiency, making the electrolysis process more efficient.

[0026] Preferably, the desalination component includes a reverse osmosis membrane.

[0027] In this solution, the above-mentioned approach not only improves the efficiency and quality of seawater desalination, but also reduces equipment investment and operating costs.

[0028] Preferably, the hydrogen production assembly includes an electrolysis section and a purification section, the electrolysis section and the purification section are connected, the electrolysis section is used to electrolyze seawater to produce hydrogen, and the purification section is connected to the inlet end of the liquefaction storage assembly, the purification section is used to purify the hydrogen produced by the electrolysis section.

[0029] In this solution, the hydrogen produced by electrolysis in the electrolysis unit enters the purification unit, where any impurities and harmful substances that may be present are removed, ensuring the purity and safety of the hydrogen and meeting the purity requirements of the cryogenic compression unit.

[0030] Preferably, the purification unit includes a gas-liquid processor and a purification component, the gas-liquid processor and the purification component are connected, the gas-liquid processor is connected to the electrolysis unit, the gas-liquid processor is used to remove liquid from the hydrogen gas produced by electrolysis in the electrolysis unit, and the purification component is connected to the inlet end of the liquefaction storage component, the purification component is used to remove impurities from the hydrogen gas.

[0031] In this solution, the main function of the gas-liquid processor is to remove liquid from the hydrogen produced during electrolysis, effectively separating the gas-liquid mixture and ensuring the efficiency and safety of subsequent purification processes. The purification unit further removes impurities from the hydrogen, improving its purity to meet the high standards required for liquefied storage and subsequent applications. This approach not only improves the purity of the hydrogen but also reduces safety risks during storage and use by minimizing impurities.

[0032] Preferably, the marine hydrogen production system further includes a second float assembly, on which both the hydrogen production assembly and the liquefaction storage assembly are disposed.

[0033] In this design, the second floating assembly, using the aforementioned configuration, provides a platform for both the hydrogen production and liquefaction storage components. Furthermore, the placement of the liquefaction storage component within the second floating assembly leverages the natural cooling characteristics of the marine environment, further reducing energy consumption and improving the system's economic efficiency.

[0034] Preferably, the liquefied storage component is disposed in the storage compartment of the second float component;

[0035] And / or, the hydrogen production assembly is located on the deck of the second float assembly.

[0036] In this design, the liquefied hydrogen storage component is located within the storage compartment of the second float assembly, ensuring the stability and safety of liquid hydrogen during storage. Since liquid hydrogen requires storage at extremely low temperatures, the insulation performance of the storage compartment is crucial to effectively prevent evaporation and heat loss, thereby improving storage efficiency. Placing the hydrogen production component on the deck provides stable platform support. Furthermore, the deck offers ample working space, facilitating routine inspections and emergency repairs, thus aiding in the maintenance and monitoring of the hydrogen production component.

[0037] Preferably, the second float assembly is made of steel; and / or, the second float assembly is a ship.

[0038] In this design, the above-mentioned form ensures the structural stability and durability of the second floating body component, enabling it to withstand the harsh conditions of the marine environment.

[0039] Preferably, the marine hydrogen production system further includes a mooring assembly, and the second float assembly is provided with a mooring interface assembly. The mooring assembly is connected to the mooring interface assembly and is used to fix the second float assembly.

[0040] In this scheme, the above-mentioned form is adopted, and the second floating body component can be fixed by the mooring component to prevent it from shifting or capsizing due to natural forces such as wind and waves, thus ensuring the stable operation of the entire hydrogen production system.

[0041] Preferably, the mooring interface component includes a mooring interface and a mooring section;

[0042] When there is only one mooring interface, the mooring interface is connected to the outer turret through the mooring section;

[0043] When there are multiple mooring interfaces, the multiple mooring interfaces are arranged circumferentially along the second floating body assembly, and the multiple mooring interfaces are all fixed to the seabed by the mooring part.

[0044] In this scheme, the above-mentioned form is adopted. When there is only one mooring interface, it is connected to the outer turret through the mooring part, providing a direct and firm fixing point. This ensures the stability of the second floating body component in harsh sea conditions and prevents it from capsizing due to wind and waves, thereby ensuring the safe operation of the hydrogen production equipment. When there are multiple mooring interfaces, they are arranged circumferentially along the second floating body component and are all fixed to the seabed through the mooring part. This layout increases the fixing points, distributes the stress, and is suitable for sea areas with relatively good environmental conditions.

[0045] Preferably, the marine hydrogen production system further includes a crane located on the deck, the crane's coverage area including the hydrogen production unit and / or the liquefaction storage unit and the maintenance area, the crane being used to move between the maintenance area and the hydrogen production unit and / or the liquefaction storage unit.

[0046] In this solution, the aforementioned approach improves the overall system's operational efficiency and ease of maintenance. The crane facilitates faster and safer material transport between the maintenance area and between the hydrogen production and liquefaction storage components, reducing the labor intensity and risks associated with manual handling while simultaneously increasing operational efficiency. When maintenance, component replacement, or emergency repairs to the hydrogen production or liquefaction storage components are required, the crane can quickly and accurately transport personnel, tools, and materials to the designated location, ensuring the timeliness and effectiveness of maintenance work.

[0047] Preferably, the offshore hydrogen production system further includes an emergency power generation component, a control switch, and a control unit. The emergency power generation component is used to supply power to the hydrogen production component and / or the liquefaction storage component. The control switch is used to control the opening and closing of the passage between the emergency power generation component and the hydrogen production component and / or the liquefaction storage component. The control unit is used to receive the power supply status of the hydrogen production component and / or the liquefaction storage component, and control the opening and closing of the control switch according to the power supply status of the hydrogen production component and / or the liquefaction storage component.

[0048] When the marine hydrogen production system is in operation and the control unit receives a notification that the hydrogen production component and / or the liquefaction storage component is not powered, the control unit controls the control switch to open so as to power the hydrogen production component and / or the liquefaction storage component through the emergency power generation component.

[0049] When the control unit receives power from the hydrogen production assembly and / or the liquefaction storage assembly, the control unit controls the control switch to close.

[0050] In this solution, the above-mentioned approach is adopted so that when a power outage occurs, the emergency power generation unit supplies power to the hydrogen production unit and the liquefaction storage unit, ensuring the normal operation of the hydrogen production unit and the liquefaction storage unit.

[0051] Preferably, the emergency power generation component is one or more of an emergency generator, an emergency power distribution board, and a storage battery.

[0052] The positive and progressive effects of this invention are as follows:

[0053] The above-described method enables a highly efficient energy conversion process, directly producing hydrogen from seawater and liquefying it into liquid hydrogen. This not only improves energy utilization efficiency but also effectively addresses the safety and efficiency issues of hydrogen storage and transportation through the cryogenic compression section and liquid hydrogen storage tank in the liquefaction storage unit. Specifically, the liquefaction storage unit converts gaseous hydrogen into liquid hydrogen, significantly increasing the volumetric energy density of hydrogen. This allows a larger volume of hydrogen to be stored in the same storage container, reducing transportation costs. Furthermore, this method increases the weight of the stored hydrogen, reducing the space required during storage and transportation. In addition, the liquid hydrogen storage tank reduces the infiltration of external heat, effectively controlling the evaporation loss of liquid hydrogen. Attached Figure Description

[0054] Figure 1 is a schematic diagram of the structure of the marine hydrogen production system according to an embodiment of the present invention.

[0055] Figure 2 is a top view of the marine hydrogen production system according to an embodiment of the present invention.

[0056] Figure 3 is a flowchart of a preferred embodiment of the marine hydrogen production system of the present invention.

[0057] Figure 4 is a flowchart of another preferred embodiment of the marine hydrogen production system of the present invention.

[0058] Explanation of reference numerals in the attached drawings: Marine hydrogen production system 100; Hydrogen production assembly 1; Electrolysis unit 11; Gas-liquid processor 12; Purification unit 13; Liquefaction storage assembly 2; Cryogenic compressor 21; Pressurization pump 211; Compressor 212; Cooling unit 213; Liquid hydrogen storage tank 22; Desalination assembly 3; Reverse osmosis membrane 31; Secondary buoy assembly 4; Mooring assembly 5; Mooring interface assembly 51; Mooring interface 511; Export assembly 6; Secondary liquefaction assembly 7 Detailed Implementation

[0059] As shown in Figures 1 to 4, this embodiment provides a marine hydrogen production system 100, including a hydrogen production component 1 for producing hydrogen using seawater. The marine hydrogen production system 100 also includes a liquefaction storage component 2, which is connected to the hydrogen production component 1. The liquefaction storage component 2 is used to liquefy hydrogen into liquid hydrogen and store it. The liquefaction storage component 2 includes a cryogenic compression section 21 and a liquid hydrogen storage tank 22, which are connected. The cryogenic compression section 21, connected to the hydrogen production component 1, is used to convert gaseous hydrogen into liquid hydrogen, and the liquid hydrogen storage tank 22 is used to store the liquid hydrogen. This method achieves a highly efficient energy conversion process by directly producing hydrogen from seawater and liquefying it into liquid hydrogen. This not only improves energy utilization efficiency but also effectively solves the safety and efficiency issues of hydrogen storage and transportation through the cryogenic compression section 21 and the liquid hydrogen storage tank 22 in the liquefaction storage component 2. Specifically, the liquefaction storage component 2 converts gaseous hydrogen into liquid hydrogen, significantly increasing the volumetric energy density of hydrogen. This allows a single volume of hydrogen storage container to store more hydrogen, reducing transportation costs. Furthermore, this design increases the weight of the stored hydrogen, reducing the space required for storage and transportation. In addition, the liquid hydrogen storage tank 22 reduces the infiltration of external heat, effectively controlling the evaporation loss of liquid hydrogen.

[0060] It should be specifically noted that the material of the liquid hydrogen storage tank 22 should possess good mechanical, physical, and processing properties, and should also maintain good compatibility with liquid hydrogen. In this embodiment, the liquid hydrogen storage tank 22 is a type C tank (cryogenic); in other embodiments, the liquid hydrogen storage tank 22 can also be a type B tank.

[0061] The cryogenic compression unit 21 specifically includes a pressurization pump 211, a compressor 212, and a cooling component 213, which are sequentially connected. The pressurization pump 211 is connected to the hydrogen production assembly 1. The pressurization pump 211 is used to increase the pressure of hydrogen, the compressor 212 is used to compress the hydrogen, and the cooling component 213 is used to cool the hydrogen, thereby converting gaseous hydrogen into liquid hydrogen. Using the above configuration, the orderly connection of the pressurization pump 211, compressor 212, and cooling component 213 achieves efficient conversion of hydrogen from a gaseous to a liquid state. The pressurization pump 211 increases the pressure of hydrogen, thereby reducing its volume, making it easier to achieve the required cryogenic conditions for liquefaction during subsequent cooling. Subsequently, the compressor 212 further acts on the hydrogen, increasing its pressure by reducing its volume, thereby reducing energy consumption in the subsequent liquefaction process and improving liquefaction efficiency. Finally, the intervention of the cooling component 213 promotes the phase change of gaseous hydrogen to liquid hydrogen by lowering the hydrogen temperature. This process not only increases the volumetric energy density of hydrogen, but also improves the safe storage and transportation of hydrogen, thereby optimizing the hydrogen production and storage process and reducing energy consumption and costs.

[0062] It should be specifically noted that, for the cooling component 213, this embodiment can adopt the hydrogen liquefaction process commonly used in industry, mainly based on the Claude cycle (hydrogen refrigeration), and this cycle includes the process of pre-compressing hydrogen at room temperature, pre-cooling to 80K with liquid nitrogen or a mixed working fluid, cooling to 30K with hydrogen / helium expansion refrigeration, and cooling to 20K through throttling expansion to achieve liquefaction.

[0063] The marine hydrogen production system 100 also includes a secondary liquefaction component 7, which connects the first outlet of the liquid hydrogen storage tank 22 to the inlet of the cryogenic compression unit 21. The secondary liquefaction component 7 is used to transfer liquefied gaseous hydrogen from the liquid hydrogen storage tank 22 to the cryogenic compression unit 21. This configuration ensures that liquefied gaseous hydrogen from the liquid hydrogen storage tank 22 can be transferred to the cryogenic compression unit 21, allowing the gaseous hydrogen to be liquefied again through the cryogenic compression unit 21.

[0064] In this embodiment, the secondary liquefaction component 7 is connected to the first outlet end and the inlet end of the pressurization pump 211, so that the liquefied hydrogen is pressurized, compressed and cooled again to form liquid hydrogen and stored in the liquid hydrogen storage tank 22.

[0065] The secondary liquefaction component 7 includes a connecting pipe that connects the first outlet end of the liquid hydrogen storage tank 22 to the inlet end of the cryogenic compression section 21. This configuration establishes communication between the liquid hydrogen storage tank 22 and the cryogenic compression section 21, allowing the liquefied gaseous hydrogen in the liquid hydrogen storage tank 22 to enter the cryogenic compression section through the connecting pipe for further liquefaction.

[0066] In this embodiment, the connecting pipe connects the first outlet end of the liquid hydrogen storage tank 22 and the inlet end of the pressurization pump 211. In other embodiments, the connection position of the connecting pipe can be adjusted according to actual needs, and is not limited here.

[0067] The marine hydrogen production system 100 also includes an external delivery component 6, which is connected to the second outlet end of the liquid hydrogen storage tank 22. The external delivery component 6 is used to transport liquid hydrogen stored in the liquid hydrogen storage tank 22. Vertically, the second outlet end is lower than the first outlet end. With this configuration, the density of the liquefied hydrogen gas is less than that of liquid hydrogen, and the height of the first outlet end is higher than that of the second outlet end, which also facilitates the flow of the liquefied hydrogen gas into the cryogenic compression section 21. This effectively avoids potential safety hazards of liquefied hydrogen gas in the liquid hydrogen storage tank 22.

[0068] The external conveying component 6 is connected to the outlet end of the liquefied storage component 2, and is used to transport liquid hydrogen stored in the liquid hydrogen storage tank 22. This method ensures a stable supply of liquid hydrogen throughout the entire process from production to use by transporting the liquid hydrogen stored in the storage tank 22. Furthermore, the connection via the external conveying component 6 allows for a smooth transition from storage to transportation, facilitating subsequent use of the liquid hydrogen.

[0069] For the external transmission component 6, when the offshore hydrogen production system 100 is close to the onshore storage component, the external transmission component 6 includes a first external transmission section and an oil transport pipe. The two ends of the oil transport pipe are connected and communicated with the liquefied storage component 2 and the onshore storage component, respectively. The first external transmission section is located on the oil transport pipe and is used to provide power for the transportation of liquid hydrogen in the oil transport pipe. Specifically, when the offshore hydrogen production system 100 is close to the onshore storage component, liquid hydrogen can be directly transported using the oil transport pipe, which reduces transportation costs.

[0070] When the offshore hydrogen production system 100 is far from the onshore storage unit, the external delivery component 6 includes a second external delivery section, a delivery pipe, and a first float assembly. The two ends of the delivery pipe are connected and communicate with the liquefied storage component 2 and the storage component of the first float assembly, respectively. The second external delivery section is located on the first float assembly and provides power for the delivery of liquid hydrogen in the delivery pipe. In other words, when the offshore hydrogen production system 100 is far from the onshore storage unit, liquid hydrogen can be delivered to the storage component of the first float assembly, and then transported to land using the first float assembly.

[0071] The above approach allows operators to select the appropriate export component 6 based on the operating environment, thus expanding the application scenarios of the marine hydrogen production system 100.

[0072] In practical use, both the first and second external delivery sections are pumps. In other embodiments, the types of the first and second external delivery sections can be adjusted according to actual needs and are not limited here. Furthermore, it is preferable that the first floating body assembly can be designed in a ship shape, which is beneficial for increasing the platform deck area and improving deck load, allowing the first floating body assembly to have good hydrodynamic performance and reducing resistance. In other embodiments, the first floating body assembly can also be of other types, and are not limited here.

[0073] The marine hydrogen production system 100 also includes a desalination unit 3, which is connected to the inlet of the hydrogen production unit 1. The desalination unit 3 is used to extract and desalinate the salt in seawater. By employing this design, the desalination unit 3 can reduce side reactions and corrosion problems during the hydrogen production process, thereby protecting the hydrogen production unit 1 and extending its service life. Furthermore, this design can prevent impurities in the seawater from affecting the electrolysis efficiency, making the electrolysis process more efficient.

[0074] In this embodiment, the desalination component 3 is a conventional desalination component used to remove salt from seawater, and it includes a reverse osmosis membrane 31 and a water pump. Specifically, the water pump draws seawater, and the drawn seawater can be desalinated through the reverse osmosis membrane 31. This approach not only improves the efficiency and quality of seawater desalination but also reduces equipment investment and operating costs.

[0075] In practical use, the delivery pipe is a flexible hose, and the height of the flexible hose can be changed by a flexible hose crane.

[0076] The hydrogen production assembly 1 includes an electrolysis unit 11 and a purification unit, which are connected. The electrolysis unit 11 is used to electrolyze seawater to produce hydrogen, and the purification unit is connected to the inlet of the liquefied storage assembly 2. The purification unit is used to purify the hydrogen produced by the electrolysis unit 11. In this configuration, the hydrogen produced by the electrolysis unit 11 enters the purification unit, where any impurities and harmful substances are removed, ensuring the purity and safety of the hydrogen and meeting the purity requirements of the cryogenic compression unit.

[0077] In practical use, the inlet end of the electrolysis unit 11 is connected to the outlet end of the desalination component 3, so that the desalinated seawater can be electrolyzed by the electrolysis unit 11 to generate hydrogen gas, thereby preventing impurities in the seawater from affecting the service life of the electrolysis unit 11.

[0078] In this embodiment, the electrolysis unit 11 is an electrolytic cell. In other embodiments, the type of the electrolysis unit 11 can be adjusted according to actual needs, and is not limited here.

[0079] The purification unit includes a gas-liquid processor 12 and a purification component 13, which are connected. The gas-liquid processor 12 is connected to the electrolysis unit 11 and is used to remove liquid from the hydrogen produced by electrolysis in the electrolysis unit 11. The purification component 13 is connected to the inlet of the liquefied storage assembly 2 and is used to remove impurities from the hydrogen. Specifically, the main function of the gas-liquid processor 12 is to remove liquid from the hydrogen produced during electrolysis, effectively separating the gas-liquid mixture and ensuring the efficiency and safety of the subsequent purification process. The purification component 13 further removes impurities from the hydrogen, improving its purity to meet the high standards required for liquefied storage and subsequent applications. This approach not only improves the purity of the hydrogen but also reduces the safety risks associated with its storage and use by decreasing impurity content.

[0080] In this embodiment, the purification component 13 is a component in the prior art that purifies hydrogen and reduces impurities, and it can be a pressure swing adsorption (PSA) device, membrane separator, etc.

[0081] The marine hydrogen production system 100 also includes a second floating assembly 4, on which both the hydrogen production assembly 1 and the liquefaction storage assembly 2 are located. In this configuration, the second floating assembly 4 provides a platform for both the hydrogen production assembly 1 and the liquefaction storage assembly 2. Furthermore, the placement of the liquefaction storage assembly 2 within the second floating assembly 4 utilizes the natural cooling characteristics of the marine environment, further reducing energy consumption and improving the system's economic efficiency.

[0082] In this embodiment, the second floating body assembly 4 can be designed in a ship shape, which is beneficial for increasing the platform deck area and improving deck load, enabling the second floating body assembly 4 to have good hydrodynamic performance and reduce resistance. In other embodiments, the second floating body assembly 4 can also be of other types, which are not limited here.

[0083] In this embodiment, the liquefaction storage assembly 2 is located within the storage compartment of the second float assembly 4; the hydrogen production assembly 1 and the desalination assembly 3 are located on the deck of the second float assembly 4. By placing the liquefaction storage assembly 2 within the storage compartment of the second float assembly 4, the stability and safety of the liquid hydrogen during storage can be ensured. Since liquid hydrogen needs to be stored at extremely low temperatures, the insulation performance of the storage compartment is crucial to effectively prevent evaporation and heat loss, thereby improving storage efficiency. Placing the hydrogen production assembly 1 on the deck provides stable platform support. Furthermore, the deck provides a relatively spacious working area, facilitating routine inspections and emergency maintenance by operators, thus aiding in the maintenance and monitoring of the hydrogen production assembly 1 and the desalination assembly 3.

[0084] In other embodiments, the positions of the liquefaction storage component 2, the hydrogen production component 1, and the desalination component 3 on the second float component 4 can be adjusted according to actual needs, and are not limited here.

[0085] In practical use, the second floating body component 4 is also equipped with a high-comfort living quarters and a helicopter platform to meet the platform personnel's requirements for living, entertainment, sports and catering, rapid transfer and emergency safety; the living quarters are equipped with lifeboats to ensure the safe evacuation of platform personnel in case of fire, explosion and other emergencies; and a deck crane is equipped to realize the installation, replacement, transportation and maintenance of hydrogen production module and hydrogen compression and liquefaction module, as well as platform resupply.

[0086] In this embodiment, the second float assembly 4 is made of steel, ensuring the structural stability and durability of the float assembly and enabling it to withstand the harsh conditions of the marine environment. In other embodiments, the material of the second float assembly 4 can be adjusted according to actual needs, and is not limited here.

[0087] As shown in Figure 2, the marine hydrogen production system 100 also includes a mooring assembly 5. A mooring interface assembly 51 is provided on the second float assembly 4, and the mooring assembly 5 is connected to the mooring interface assembly 51. The mooring assembly 5 is used to secure the second float assembly 4. Using this configuration, the second float assembly 4 can be secured by the mooring assembly 5, preventing it from shifting or capsizing due to natural forces such as wind and waves, thus ensuring the stable operation of the entire hydrogen production system.

[0088] Specifically, the mooring interface assembly 51 includes a mooring interface 511 and a mooring section. When there is only one mooring interface 511, it is connected to the outer turret via the mooring section. When there are multiple mooring interfaces 511, they are arranged circumferentially around the second float assembly 4, and all are fixed to the seabed via the mooring section. Using this configuration, when there is only one mooring interface 511, its connection to the outer turret via the mooring section provides a direct and secure anchoring point, ensuring the stability of the second float assembly 4 in rough sea conditions and preventing capsizing due to wind and waves, thus guaranteeing the safe operation of the hydrogen production equipment. When there are multiple mooring interfaces 511, they are arranged circumferentially around the second float assembly 4 and fixed to the seabed via the mooring section. This layout increases the number of anchoring points, distributes the stress, and is suitable for sea areas with relatively favorable environmental conditions.

[0089] In this embodiment, the mooring part is a rope; the mooring interface 511 is the same as the mooring interface 511 in the prior art, which can be installed on the ship and the mooring interface 511 is an interface that can fix the second floating body assembly 4 to the seabed by rope, and its shape can be a hook type or the like.

[0090] In addition, in practical use, the second floating body assembly 4 includes functional compartments (mechanical equipment room), liquid tanks (freshwater tank, ballast tank, etc.), and empty tanks to facilitate hydrogen storage and adjust the buoyancy of the integrated platform, giving it better resistance to wind and waves. Cable routes are planned on the main deck surface of the second attached assembly to facilitate neat and uniform cable pre-laying.

[0091] The offshore hydrogen production system 100 also includes a crane located on the deck. The crane's coverage area includes the hydrogen production assembly 1, the liquefied storage assembly 2, and the maintenance area. The crane is used to move between the maintenance area and between the hydrogen production assembly 1 and the liquefied storage assembly 2. This configuration improves the overall system's operational efficiency and ease of maintenance. The crane makes the transport of materials between the maintenance area and between the hydrogen production assembly 1 and the liquefied storage assembly 2 faster and safer, reducing the labor intensity and risks of manual handling while increasing operational efficiency. When maintenance, component replacement, or emergency repairs are required on the hydrogen production assembly 1 or the liquefied storage assembly 2, the crane can quickly and accurately transport personnel, tools, and materials to the designated location, ensuring the timeliness and effectiveness of maintenance work.

[0092] In this embodiment, the crane's coverage area includes the desalination unit 3, the hydrogen production unit 1, the liquefaction unit, and the maintenance area, and the crane can move between two of the desalination unit 3, the hydrogen production unit 1, the liquefaction unit, and the maintenance area.

[0093] The offshore hydrogen production system 100 also includes an emergency power generation component, a control switch, and a control unit. The emergency power generation component supplies power to the hydrogen production component 1 and the liquefied storage component 2. The control switch controls the opening and closing of the connection between the emergency power generation component and the hydrogen production component 1 and the liquefied storage component 2. The control unit receives information about the power supply status of the hydrogen production component 1 and the liquefied storage component 2 and controls the opening and closing of the control switch accordingly. Specifically, when the offshore hydrogen production system 100 is in operation and the control unit receives a notification that the hydrogen production component 1 and the liquefied storage component 2 are not receiving power, the control unit controls the control switch to open, so as to supply power to the hydrogen production component 1 and the liquefied storage component 2 through the emergency power generation component. When the control unit receives a notification that the hydrogen production component 1 and the liquefied storage component 2 are receiving power, the control unit controls the control switch to close. Using this configuration, in the event of a power outage, the emergency power generation component supplies power to the hydrogen production component 1 and the liquefied storage component 2, ensuring their normal operation.

[0094] In practical use, the emergency power generation components and power generation equipment can also supply power to the desalination component 3 and the external transmission component 6.

[0095] In this embodiment, electricity generated from new energy sources such as offshore wind energy, wave energy, and tidal energy can be supplied to the hydrogen production unit 1 and the liquefaction storage unit 2. The emergency power generation unit is one or more of an emergency generator, an emergency switchboard, and a storage battery.

[0096] In practical use, seawater is drawn in by a water pump, and the desalination component 3 of the reverse osmosis membrane 31 is used to desalinate the seawater. The desalinated seawater is then electrolyzed by the electrolysis unit 11 to produce hydrogen, which is then passed through the gas-liquid processor 12 and the purification unit 13 to remove moisture and impurities. Subsequently, the hydrogen is converted from gaseous hydrogen to liquid hydrogen by the pressurization pump 211, the compressor 212, and the cooling unit 213, and the liquid hydrogen is stored in the liquid hydrogen storage tank 22. The first outlet end of the liquid hydrogen storage tank 22 and the inlet end of the pressurization pump 211 are connected by a connecting pipe, which allows liquefied hydrogen to be introduced to the inlet end of the pressurization pump 211. After being pressurized, compressed, and cooled, the liquefied hydrogen is converted back into liquid hydrogen, thereby improving the liquefaction rate of hydrogen and avoiding potential safety hazards of liquefied hydrogen in the liquid hydrogen storage tank 22. When liquid hydrogen needs to be transported, different transport methods can be selected based on the distance between the offshore hydrogen production system 100 and the onshore storage unit. When the offshore hydrogen production system 100 is far from the onshore storage unit, the liquid hydrogen can be transported to the storage unit of the first floating assembly, and then transported to land using the first floating assembly. When the offshore hydrogen production system 100 is close to the onshore storage unit, hydrogen can be directly transported using the pipeline used for transporting oil, reducing transportation costs.

[0097] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and various changes or modifications can be made to these embodiments without departing from the principles and essence of the present invention. Therefore, the scope of protection of the present invention is defined by the appended claims.

Claims

1. A marine hydrogen production system, comprising a hydrogen production assembly for producing hydrogen from seawater, characterized in that, The marine hydrogen production system also includes a liquefaction storage component, which is connected to the hydrogen production component. The liquefaction storage component is used to liquefy hydrogen into liquid hydrogen and store the liquid hydrogen. The liquefaction storage assembly includes a cryogenic compression section and a liquid hydrogen storage tank. The cryogenic compression section and the liquid hydrogen storage tank are connected. The cryogenic compression section is connected to the hydrogen production assembly to convert gaseous hydrogen into liquid hydrogen. The liquid hydrogen storage tank is used to store liquid hydrogen.

2. The marine hydrogen production system as described in claim 1, characterized in that, The cryogenic compression unit includes a pressurizing pump, a compressor, and a cooling component. The pressurizing pump, the compressor, and the cooling component are connected in sequence. The pressurizing pump is connected to the hydrogen production assembly. The pressurizing pump is used to increase the pressure of the hydrogen gas. The compressor is used to compress the hydrogen gas. The cooling component is used to cool the hydrogen gas to convert gaseous hydrogen into liquid hydrogen.

3. The marine hydrogen production system as described in claim 1 or 2, characterized in that, The marine hydrogen production system also includes a secondary liquefaction component, which is connected to the first outlet of the liquid hydrogen storage tank and the inlet of the cryogenic compression unit. The secondary liquefaction component is used to transfer the liquefied gaseous hydrogen in the liquid hydrogen storage tank to the cryogenic compression unit.

4. The marine hydrogen production system as described in claim 3, characterized in that, The secondary liquefaction component includes a connecting pipe for connecting the first outlet end of the liquid hydrogen storage tank and the inlet end of the cryogenic compression section.

5. The marine hydrogen production system as described in claim 3 or 4, characterized in that, The marine hydrogen production system also includes an external transmission component, which is connected to the second outlet of the liquid hydrogen storage tank and is used to transport liquid hydrogen stored in the liquid hydrogen storage tank. In the vertical direction, the second outlet end is lower than the first outlet end.

6. The marine hydrogen production system as described in any one of claims 1-5, characterized in that, The marine hydrogen production system also includes an external transmission component, which is connected to the outlet of the liquefaction storage component and is used to transport liquid hydrogen stored in the liquid hydrogen storage tank.

7. The marine hydrogen production system as described in claim 6, characterized in that, The external transport component includes a first external transport section and an oil transport pipe. The two ends of the oil transport pipe are connected and communicated with the liquefied storage component and the onshore storage component, respectively. The first external transport section is disposed on the oil transport pipe and is used to provide power for the transport of liquid hydrogen in the oil transport pipe. Alternatively, the external delivery component includes a second external delivery section, a delivery pipe, and a first float assembly. The two ends of the delivery pipe are connected and communicate with the liquefaction storage component and the storage component of the first float assembly, respectively. The second external delivery section is disposed on the first float assembly and is used to provide power for the delivery of liquid hydrogen in the delivery pipe.

8. The marine hydrogen production system as described in any one of claims 1-7, characterized in that, The marine hydrogen production system also includes a desalination unit, which is connected to the inlet of the hydrogen production unit. The desalination unit is used to extract and desalinate the salt in seawater.

9. The marine hydrogen production system as described in claim 8, characterized in that, The desalination component includes a reverse osmosis membrane.

10. The marine hydrogen production system according to any one of claims 1-9, characterized in that, The hydrogen production assembly includes an electrolysis section and a purification section, which are connected. The electrolysis section is used to electrolyze seawater to produce hydrogen, and the purification section is connected to the inlet of the liquefied storage assembly to purify the hydrogen produced by the electrolysis section.

11. The marine hydrogen production system as described in claim 10, characterized in that, The purification unit includes a gas-liquid processor and a purification component. The gas-liquid processor and the purification component are connected. The gas-liquid processor is connected to the electrolysis unit. The gas-liquid processor is used to remove liquid from the hydrogen gas produced by electrolysis in the electrolysis unit. The purification component is connected to the inlet end of the liquefaction storage component. The purification component is used to remove impurities from the hydrogen gas.

12. The marine hydrogen production system as described in any one of claims 1-11, characterized in that, The marine hydrogen production system also includes a second floating body assembly, on which both the hydrogen production assembly and the liquefaction storage assembly are located.

13. The marine hydrogen production system as described in claim 12, characterized in that, The liquefaction storage component is located in the storage compartment of the second float component; And / or, the hydrogen production assembly is located on the deck of the second float assembly.

14. The marine hydrogen production system as described in claim 12 or 13, characterized in that, The second float assembly is made of steel; And / or, the second floating body component is a ship.

15. The marine hydrogen production system as described in any one of claims 12-14, characterized in that, The marine hydrogen production system also includes a mooring assembly. The second float assembly is provided with a mooring interface assembly. The mooring assembly is connected to the mooring interface assembly and is used to fix the second float assembly.

16. The marine hydrogen production system as described in claim 15, characterized in that, The mooring interface component includes a mooring interface and a mooring section; When there is only one mooring interface, the mooring interface is connected to the outer turret through the mooring section; When there are multiple mooring interfaces, the multiple mooring interfaces are arranged circumferentially along the second floating body assembly, and the multiple mooring interfaces are all fixed to the seabed by the mooring part.

17. The marine hydrogen production system as described in any one of claims 12-16, characterized in that, The offshore hydrogen production system also includes a crane located on the deck. The crane's coverage area includes the hydrogen production unit and / or the liquefaction storage unit, as well as the maintenance area. The crane is used to move between the maintenance area and the hydrogen production unit and / or the liquefaction storage unit.

18. The marine hydrogen production system according to any one of claims 1-17, characterized in that, The offshore hydrogen production system also includes an emergency power generation component, a control switch, and a control unit. The emergency power generation component is used to power the hydrogen production component and / or the liquefaction storage component. The control switch is used to control the opening and closing of the passage between the emergency power generation component and the hydrogen production component and / or the liquefaction storage component; the control unit is used to receive the data from the hydrogen production component and... / or the power supply status of the liquefaction storage component, and control the opening and closing of the control switch according to the power supply status of the hydrogen production component and / or the liquefaction storage component; When the marine hydrogen production system is in operation and the control unit receives a notification that the hydrogen production component and / or the liquefaction storage component is not powered, the control unit controls the control switch to open so as to power the hydrogen production component and / or the liquefaction storage component through the emergency power generation component. When the control unit receives power from the hydrogen production assembly and / or the liquefaction storage assembly, the control unit controls the control switch to close.

19. The marine hydrogen production system as described in claim 18, characterized in that, The emergency power generation components are one or more of an emergency generator, an emergency power distribution board, and a storage battery.

Images