Offshore hydrogen production system

Abstract

The invention discloses an offshore hydrogen production system which comprises a hydrogen production assembly, the hydrogen production assembly is used for producing hydrogen through seawater, the offshore hydrogen production system further comprises a liquefaction storage assembly, the hydrogen production assembly communicates with the liquefaction storage assembly, and the liquefaction storage assembly is used for liquefying hydrogen into liquid hydrogen and storing the liquid hydrogen. The liquefaction 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 and used for converting gaseous hydrogen into liquid hydrogen, and the liquid hydrogen storage tank is used for storing the liquid hydrogen. By the adoption of the structural form, the efficient energy conversion process that hydrogen is directly extracted from seawater and liquefied into liquid hydrogen is achieved, the energy utilization efficiency is improved, and the safety and efficiency problems of hydrogen storage and transportation are effectively solved through the low-temperature compression part and the liquid hydrogen storage tank in the liquefaction storage assembly.

Description

Technical Field

[0001] The invention relates to an offshore hydrogen production system. Background Art

[0002] Hydrogen energy has received widespread attention around the world and has become an important energy and industry direction for addressing climate change and building decarbonization. Compared with hydrogen production methods such as chlor-alkali byproduct gas, coke oven gas, and ethane cracking, using renewable energy to electrolyze seawater or fresh water to produce hydrogen and ensure the supply of green hydrogen energy is more in line with the requirements of the development of the times. The world is rich in offshore wind energy, wave energy, and tidal energy. Using offshore renewable energy to directly produce hydrogen is an overall environmentally friendly and energy-saving hydrogen production technology.

[0003] The existing technology produces gaseous hydrogen at sea. If the produced gaseous hydrogen is far away from the land, it needs to be transported over long distances. At present, there are two ways to transport gaseous hydrogen over long distances: transportation pipelines or construction of high-pressure gas tanks. However, building transportation pipelines requires a lot of manpower and financial resources, which will increase the transportation cost of hydrogen. The volume of high-pressure gas tanks is small, so a large number of high-pressure gas tanks are needed to store them, which will also increase the transportation cost of hydrogen. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an offshore hydrogen production system in order to overcome the problems in the prior art of high gaseous hydrogen transportation cost and difficulty in grid connection of offshore renewable energy power fields.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] The present invention discloses an offshore hydrogen production system, comprising a hydrogen production component, wherein the hydrogen production component is used to produce hydrogen using seawater, and the offshore hydrogen production system further comprises a liquefied storage component, wherein the hydrogen production component is connected to the liquefied storage component, and the liquefied storage component is used to liquefy hydrogen into liquid hydrogen and store the liquid hydrogen;

[0007] The liquefied storage assembly includes a cryogenic compression unit and a liquid hydrogen storage tank. The cryogenic compression unit is connected to the liquid hydrogen storage tank. The cryogenic compression unit is connected to the hydrogen production assembly for converting gaseous hydrogen into liquid hydrogen. The liquid hydrogen storage tank is used to store liquid hydrogen.

[0008] In this solution, the above-mentioned form is adopted to realize an efficient energy conversion process of directly producing hydrogen from seawater and liquefying it into liquid hydrogen, which not only improves the efficiency of energy utilization, but also effectively solves the safety and efficiency problems of hydrogen storage and transportation through the cryogenic compression part and liquid hydrogen storage tank in the liquefied storage component. Specifically, the liquefied storage component converts gaseous hydrogen into liquid hydrogen, which significantly improves the volume energy density of hydrogen, so that the same volume of hydrogen storage container can store more hydrogen, which is conducive to reducing transportation costs, and the above-mentioned form increases the weight of hydrogen storage and reduces the space occupied during storage and transportation. In addition, the infiltration of external heat is reduced by the liquid hydrogen storage tank, and the evaporation loss of liquid hydrogen is effectively controlled.

[0009] Preferably, the low-temperature compression section includes a booster pump, a compressor and a cooling component, the booster pump, the compressor and the cooling component are connected in sequence, the booster pump is connected to the hydrogen production component, the booster 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.

[0010] In this scheme, the above-mentioned form is adopted, and the efficient conversion of hydrogen from gas to liquid is achieved through the orderly connection of the booster pump, the compressor and the cooling component. The booster pump can increase the pressure of the hydrogen, thereby reducing the volume of the hydrogen, so that it is easier to reach the low temperature conditions required for liquefaction when the hydrogen is subsequently cooled. Subsequently, the compressor further acts on the hydrogen to increase the pressure by reducing the volume of the gas, thereby reducing the energy consumption in the subsequent liquefaction process and improving the energy efficiency of liquefaction. Finally, the intervention of the cooling component promotes the phase change of gaseous hydrogen to liquid hydrogen by lowering the temperature of the hydrogen. This process not only increases the volume energy density of hydrogen, but also improves the safe storage and transportation of hydrogen, thereby optimizing the process of hydrogen production and storage and reducing energy consumption and costs.

[0011] Preferably, the offshore hydrogen production system also 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 part, and is used to transfer the liquefied gaseous hydrogen in the liquid hydrogen storage tank to the cryogenic compression part.

[0012] In the present solution, the above-mentioned form is adopted to ensure that the gaseous hydrogen liquefied from the liquid hydrogen storage tank can be transferred to the cryogenic compression part, so that the gaseous hydrogen can be liquefied again through the cryogenic compression part.

[0013] Preferably, the secondary liquefaction assembly includes a connecting pipe, and the connecting pipe is used to connect the first outlet end of the liquid hydrogen storage tank and the inlet end of the cryogenic compression part.

[0014] In this solution, the above-mentioned form is adopted, and the connection between the liquid hydrogen storage tank and the cryogenic compression part is realized through the connecting pipe, so that the liquefied gaseous hydrogen in the liquid hydrogen storage tank can enter the cryogenic compression part through the connecting pipe, so as to liquefy the gaseous hydrogen again through the cryogenic compression part.

[0015] Preferably, the offshore hydrogen production system further comprises an external transport component, the external transport component is in communication with the second outlet end of the liquid hydrogen storage tank, and the external transport component is used to transport the liquid hydrogen stored in the liquid hydrogen storage tank;

[0016] Wherein, in the vertical direction, the second outlet end is lower than the first outlet end.

[0017] In the present solution, the above-mentioned form is adopted, the density of the liquefied hydrogen is less than the density of liquid hydrogen, and the height of the first outlet end is higher than the second outlet end, which will also facilitate the flow of the liquefied hydrogen into the cryogenic compression part, thereby effectively avoiding the potential safety hazards of liquefied hydrogen in the liquid hydrogen storage tank.

[0018] Preferably, the offshore hydrogen production system further comprises an external transmission component, wherein the external transmission component is connected to the outlet end of the liquefied storage component, and the external transmission component is used to transport the liquid hydrogen stored in the liquid hydrogen storage tank.

[0019] In this solution, the above-mentioned form is adopted to transport the liquid hydrogen stored in the liquid hydrogen storage tank, ensuring a stable supply of liquid hydrogen throughout the entire process from production to use. In addition, through the connection of the external transmission component, the liquid hydrogen can be smoothly transferred from the storage link to the transportation link, which is convenient for the later use of the liquid hydrogen.

[0020] Preferably, the external transmission component comprises a first external transmission part and an oil transportation pipe, the two ends of the oil transportation pipe are respectively connected and communicated with the liquefied storage component and the onshore storage component, the first external transmission part is arranged on the oil transportation pipe, and the first external transmission part is used to provide power for the transportation of liquid hydrogen in the oil transportation pipe;

[0021] Alternatively, the external transmission component includes a second external transmission part, a delivery pipe and a first floating body component, the two ends of the delivery pipe are respectively connected and communicated with the liquefied storage component and the storage component of the first floating body component, the second external transmission part is arranged on the first floating body component, and the second external transmission part is used to provide power for the transportation of liquid hydrogen in the delivery pipe.

[0022] In this solution, the above-mentioned form is adopted, so that the operator can choose the appropriate external transmission component according to the use environment, which expands the use scenario of the offshore hydrogen production system. Specifically, when the offshore hydrogen production system is far away from the onshore storage component, the liquid hydrogen can be transported to the storage component of the first floating assembly, and the first floating assembly can be used to transport the liquid hydrogen to the land. In short, the flexibility of liquid hydrogen transportation is improved by the transmission pipe and the first floating assembly. When the offshore hydrogen production system is close to the onshore storage component, the liquid hydrogen can be directly transported using the transportation pipe for transporting oil, reducing transportation costs.

[0023] Preferably, the offshore hydrogen production system further comprises a desalination component, which is connected to the inlet end of the hydrogen production component and is used to extract and desalinate salt in seawater.

[0024] In this solution, the above-mentioned form is adopted, and the side reactions and corrosion problems in the hydrogen production process can be reduced through the desalination component, so that the hydrogen production component can be protected and the service life of the hydrogen production component can be extended. In addition, the above-mentioned form can also prevent impurities in seawater from affecting the efficiency of electrolysis, making the electrolysis process more efficient.

[0025] Preferably, the desalination component comprises a reverse osmosis membrane.

[0026] In this scheme, the above-mentioned form is adopted, which not only improves the efficiency and quality of seawater desalination, but also reduces equipment investment and operating costs.

[0027] Preferably, the hydrogen production component 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, the purification section is connected to the inlet end of the liquefied storage component, and the purification section is used to purify the hydrogen produced by the electrolysis section.

[0028] In this scheme, the above-mentioned form is adopted, and the hydrogen produced by electrolysis in the electrolysis section will enter the purification section, and the possible impurities and harmful substances will be removed through the purification section to ensure the purity and safety of the hydrogen and meet the purity requirements of the low-temperature compression section for hydrogen.

[0029] Preferably, the purification section includes a gas-liquid processor and a purification component, the gas-liquid processor is communicated with the purification component, the gas-liquid processor is communicated with the electrolysis section, the gas-liquid processor is used to remove liquid from the hydrogen generated by electrolysis in the electrolysis section, the purification component is communicated with the inlet end of the liquefied storage component, and the purification component is used to remove impurities in the hydrogen.

[0030] In this solution, the main function of the gas-liquid processor is to remove the liquid from the hydrogen produced during the electrolysis process, effectively separating the gas-liquid mixture and ensuring the efficiency and safety of the subsequent purification process. The purification component further removes impurities from the hydrogen and improves the purity of the hydrogen to meet the high standards required for liquefied storage and subsequent applications. The above form not only improves the purity of the hydrogen, but also reduces the safety risks of hydrogen during storage and use by reducing the impurity content.

[0031] Preferably, the offshore hydrogen production system further comprises a second floating assembly, and the hydrogen production assembly and the liquefied storage assembly are both arranged on the second floating assembly.

[0032] In this solution, the second floating assembly provides a platform for the hydrogen production assembly and the liquefied storage assembly. In addition, the liquefied storage assembly is arranged in the second floating assembly, which can utilize the natural cooling characteristics of the marine environment to further reduce energy consumption and improve the economy of the system.

[0033] Preferably, the liquefied storage assembly is disposed in a storage compartment of the second floating assembly;

[0034] And / or, the hydrogen production assembly is arranged on the deck of the second floating body assembly.

[0035] In this solution, the above-mentioned form is adopted, and the liquefied storage assembly is arranged in the storage compartment of the second floating assembly, which can ensure the stability and safety of liquid hydrogen during the storage process. Since liquid hydrogen needs to be stored at extremely low temperatures, the insulation performance of the storage compartment is crucial, which can effectively prevent the evaporation and heat loss of liquid hydrogen, thereby improving the storage efficiency; the hydrogen production assembly is arranged on the deck, which can provide a stable platform support. In addition, the above-mentioned form is adopted, because the deck provides a relatively spacious working space, which is conducive to the operator's daily inspection and emergency maintenance work, thereby facilitating the maintenance and monitoring of the hydrogen production assembly.

[0036] Preferably, the second floating body assembly is made of steel; and / or the second floating body assembly is a ship.

[0037] In this solution, the above-mentioned form is adopted to ensure the structural stability and durability of the second floating body assembly, so that it can withstand the harsh conditions in the marine environment.

[0038] Preferably, the offshore hydrogen production system further comprises a mooring assembly, a mooring interface assembly is provided on the second floating body assembly, the mooring assembly is connected to the mooring interface assembly, and the mooring assembly is used to fix the second floating body assembly.

[0039] In this solution, the above-mentioned form is adopted, and the second floating body assembly can be fixed by the mooring assembly to prevent it from being displaced or overturned due to natural forces such as wind and waves, thereby ensuring the stable operation of the entire hydrogen production system.

[0040] Preferably, the mooring interface assembly comprises a mooring interface and a mooring portion;

[0041] Wherein, when the number of the mooring interface is one, the mooring interface is connected to the outer turret through the mooring portion;

[0042] When there are multiple mooring interfaces, the multiple mooring interfaces are arranged along the circumference of the second floating body assembly, and the multiple mooring interfaces are all fixed to the seabed through the mooring part.

[0043] In the present 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, ensuring the stable position of the second floating body assembly under severe sea conditions, preventing capsizing due to wind and waves, and thus ensuring the safe operation of the hydrogen production equipment; when there are multiple mooring interfaces, they are arranged along the circumference of the second floating body assembly, and are all fixed to the seabed through the mooring part. This layout increases the fixing points and disperses the force, and is suitable for sea areas with relatively good environmental conditions.

[0044] Preferably, the offshore hydrogen production system also includes a crane, which is installed on the deck. The coverage area of ​​the crane includes the hydrogen production component and / or the liquefied storage component and a maintenance area, and the crane is used to move between the maintenance area and the hydrogen production component and / or the liquefied storage component.

[0045] In this solution, the above form is adopted to improve the operating efficiency and maintenance convenience of the entire system. The crane makes the transportation of materials in the maintenance area and between the hydrogen production components and the liquefied storage components faster and safer, reducing the labor intensity and risks of manual handling, while improving the operation efficiency. When it is necessary to maintain the hydrogen production components or liquefied storage components, replace parts or perform emergency repairs, the crane can quickly and accurately transport personnel, tools and materials to the designated location, ensuring the timeliness and effectiveness of the maintenance work.

[0046] Preferably, the offshore hydrogen production system further comprises an emergency power generation component, a control switch and a control unit, wherein the emergency power generation component is used to supply power to the hydrogen production component and / or the liquefied 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 liquefied storage component, and the control unit is used to receive the power supply status of the hydrogen production component and / or the liquefied 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 liquefied storage component;

[0047] Wherein, when the offshore hydrogen production system is in working state, and the control unit receives that the hydrogen production component and / or the liquefied storage component is not powered, the control unit controls the control switch to be turned on, so as to power the hydrogen production component and / or the liquefied storage component through the emergency power generation component;

[0048] When the control unit receives power supply from the hydrogen production assembly and / or the liquefied storage assembly, the control unit controls the control switch to close.

[0049] In this solution, the above-mentioned form is adopted. When a power outage occurs, the emergency power generation component is used to supply power to the hydrogen production component and the liquefied storage component, thereby ensuring the normal operation of the hydrogen production component and the liquefied storage component.

[0050] Preferably, the emergency power generation component is one or more of an emergency generator, an emergency switchboard, and a battery.

[0051] The positive and progressive effects of the present invention are:

[0052] By adopting the above form, an efficient energy conversion process of directly producing hydrogen from seawater and liquefying it into liquid hydrogen is realized, which not only improves the efficiency of energy utilization, but also effectively solves the safety and efficiency problems of hydrogen storage and transportation through the cryogenic compression part and liquid hydrogen storage tank in the liquefied storage assembly. Specifically, the liquefied storage assembly converts gaseous hydrogen into liquid hydrogen, which significantly improves the volume energy density of hydrogen, so that the same volume of hydrogen storage container can store more hydrogen, which is conducive to reducing transportation costs, and the above form increases the weight of hydrogen storage and reduces the space occupied during storage and transportation. In addition, the infiltration of external heat is reduced through the liquid hydrogen storage tank, which effectively controls the evaporation loss of liquid hydrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 Schematic diagram of the structure of an offshore hydrogen production system according to an embodiment of the present invention.

[0054] Figure 2 Schematic diagram of the top view of the offshore hydrogen production system according to an embodiment of the present invention.

[0055] Figure 3 Flow chart of a preferred implementation of an offshore hydrogen production system according to an embodiment of the present invention.

[0056] Figure 4 FIG. 4 is a flow chart of another preferred implementation of the offshore hydrogen production system according to an embodiment of the present invention.

[0057] Description of reference numerals:

[0058] Offshore Hydrogen Production System 100

[0059] Hydrogen production component 1

[0060] Electrolysis unit 11

[0061] Gas and liquid processor 12

[0062] Purification component 13

[0063] Liquid storage component 2

[0064] Low temperature compression unit 21

[0065] Booster pump 211

[0066] Compressor 212

[0067] Cooling component 213

[0068] Liquid hydrogen storage tank 22

[0069] Desalination component 3

[0070] Reverse osmosis membrane 31

[0071] Second floating body assembly 4

[0072] Mooring Components 5

[0073] Mooring interface assembly 51

[0074] Mooring Interface 511

[0075] External transmission component 6

[0076] Secondary liquefaction component 7 DETAILED DESCRIPTION

[0077] like Figures 1 to 4As shown, this embodiment provides an offshore hydrogen production system 100, including a hydrogen production component 1, the hydrogen production component 1 is used to produce hydrogen using seawater, and the offshore hydrogen production system 100 also includes a liquefied storage component 2, the hydrogen production component 1 is connected to the liquefied storage component 2, and the liquefied storage component 2 is used to liquefy hydrogen into liquid hydrogen and store liquid hydrogen; wherein the liquefied storage component 2 includes a cryogenic compression part 21 and a liquid hydrogen storage tank 22, the cryogenic compression part 21 is connected to the liquid hydrogen storage tank 22, the cryogenic compression part 21 is connected to the hydrogen production component 1 for converting gaseous hydrogen into liquid hydrogen, and the liquid hydrogen storage tank 22 is used to store liquid hydrogen. The above form is adopted to realize an efficient energy conversion process of directly producing hydrogen from seawater and liquefying it into liquid hydrogen, which not only improves the utilization efficiency of energy, but also effectively solves the safety and efficiency problems of hydrogen storage and transportation through the cryogenic compression part 21 and the liquid hydrogen storage tank 22 in the liquefied storage component 2. Specifically, the liquefied storage assembly 2 converts gaseous hydrogen into liquid hydrogen, significantly increasing the volume energy density of hydrogen, so that the same volume of hydrogen storage container can store more hydrogen, which is conducive to reducing transportation costs, and the above form increases the weight of hydrogen storage and reduces the space occupied during storage and transportation. In addition, the liquid hydrogen storage tank 22 reduces the infiltration of external heat and effectively controls the evaporation loss of liquid hydrogen.

[0078] It should be specifically noted that the material of the liquid hydrogen storage tank 22 should have good mechanical properties, physical properties and process properties, and also maintain good compatibility with liquid hydrogen. In this embodiment, the liquid hydrogen storage tank 22 is a C-type tank (low temperature), and in other embodiments, the liquid hydrogen storage tank 22 can also be a B-type tank.

[0079] For the low temperature compression part 21, specifically, it includes a booster pump 211, a compressor 212 and a cooling part 213, wherein the booster pump 211, the compressor 212 and the cooling part 213 are connected in sequence, the booster pump 211 is connected to the hydrogen production assembly 1, the booster pump 211 is used to increase the pressure of hydrogen, the compressor 212 is used to compress the hydrogen, and the cooling part 213 is used to cool the hydrogen to convert the gaseous hydrogen into liquid hydrogen. With the above form, the efficient conversion of hydrogen from gaseous to liquid is achieved through the orderly connection of the booster pump 211, the compressor 212 and the cooling part 213. The booster pump 211 can increase the pressure of hydrogen, thereby reducing the volume of hydrogen, so that it is easier to reach the low temperature conditions required for liquefaction when the hydrogen is cooled later. Subsequently, the compressor 212 further acts on the hydrogen, increases the pressure by reducing the gas volume, thereby reducing the energy consumption in the subsequent liquefaction process and improving the energy efficiency of liquefaction. Finally, the intervention of the cooling component 213 promotes the phase change of gaseous hydrogen to liquid hydrogen by lowering the temperature of hydrogen. This process not only improves the volume 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.

[0080] It should be specifically noted that, for the cooling component 213, this embodiment can adopt the hydrogen liquefaction process commonly used in industry, which is mainly based on the Claude cycle (hydrogen refrigeration), and this cycle includes pre-compression of hydrogen at room temperature, pre-cooling to 80K by liquid nitrogen or mixed working fluid, cooling to 30K by hydrogen / helium expansion refrigeration, and cooling to 20K and achieving liquefaction through throttling expansion.

[0081] The offshore hydrogen production system 100 further includes a secondary liquefaction assembly 7, which is connected to the first outlet end of the liquid hydrogen storage tank 22 and the inlet end of the cryogenic compression part 21, and is used to transfer the liquefied gaseous hydrogen in the liquid hydrogen storage tank 22 to the cryogenic compression part 21. The above form ensures that the liquefied gaseous hydrogen from the liquid hydrogen storage tank 22 can be transferred to the cryogenic compression part 21, so that the gaseous hydrogen can be liquefied again through the cryogenic compression part 21.

[0082] In this embodiment, the secondary liquefaction component 7 is connected to the first outlet and the inlet of the booster 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 .

[0083] The secondary liquefaction assembly 7 includes a connecting pipe, which is used to connect the first outlet end of the liquid hydrogen storage tank 22 and the inlet end of the cryogenic compression part 21. With the above form, the connection between the liquid hydrogen storage tank 22 and the cryogenic compression part 21 is achieved, so that the liquefied gaseous hydrogen in the liquid hydrogen storage tank 22 can enter the cryogenic compression part through the connecting pipe, so as to liquefy the gaseous hydrogen again through the cryogenic compression part.

[0084] In this embodiment, the connecting pipe is connected to the first outlet end of the liquid hydrogen storage tank 22 and the inlet end of the booster pump 211. In other embodiments, the connection position of the connecting pipe can be adjusted according to actual needs and is not limited here.

[0085] The offshore hydrogen production system 100 further includes an external transport component 6, which is connected to the second outlet end of the liquid hydrogen storage tank 22, and is used to transport the liquid hydrogen stored in the liquid hydrogen storage tank 22; wherein, in the vertical direction, the second outlet end is lower than the first outlet end. In the above form, the density of the liquefied hydrogen is less than the density of liquid hydrogen, and the height of the first outlet end is higher than the second outlet end, which will also facilitate the flow of the liquefied hydrogen into the cryogenic compression part 21, thereby effectively avoiding the potential safety hazards of the liquefied hydrogen in the liquid hydrogen storage tank 22.

[0086] The external transport component 6 is connected to the outlet end of the liquefied storage component 2, and the external transport component 6 is used to transport the liquid hydrogen stored in the liquid hydrogen storage tank 22. In the above form, the liquid hydrogen stored in the liquid hydrogen storage tank 22 is transported, ensuring a stable supply of liquid hydrogen throughout the entire process from production to use. In addition, through the connection of the external transport component 6, the liquid hydrogen can be smoothly transferred from the storage link to the transportation link, which is convenient for the later use of the liquid hydrogen.

[0087] 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 part and an oil transportation pipe. The two ends of the oil transportation pipe are respectively connected and communicated with the liquefied storage component 2 and the onshore storage component. The first external transmission part is arranged on the oil transportation pipe, and the first external transmission part is used to provide power for the transportation of liquid hydrogen in the oil transportation pipe; specifically, when the offshore hydrogen production system 100 is close to the onshore storage component, the liquid hydrogen can be directly transported using the transportation pipe for transporting oil, thereby reducing transportation costs.

[0088] When the offshore hydrogen production system 100 is far away from the onshore storage assembly, the external transmission assembly 6 includes a second external transmission part, a transmission pipe and a first floating assembly, the two ends of the transmission pipe are respectively connected and communicated with the liquefied storage assembly 2 and the storage assembly of the first floating assembly, the second external transmission part is arranged on the first floating assembly, and the second external transmission part is used to provide power for the transportation of liquid hydrogen in the transmission pipe. In other words, when the offshore hydrogen production system 100 is far away from the onshore storage assembly, the liquid hydrogen can be transported to the storage assembly of the first floating assembly, and the first floating assembly is used to transport the liquid hydrogen to land.

[0089] The above-mentioned form allows operators to select a suitable external transmission component 6 according to the use environment, thereby expanding the use scenarios of the offshore hydrogen production system 100.

[0090] In specific use, the first external output part and the second external output part are both pumps. In other embodiments, the types of the first external output part and the second external output part can be adjusted according to actual needs, which is not limited here. In addition, it is preferred that the first floating body assembly can be designed as a ship type, which is conducive to increasing the platform deck area and increasing the deck load, so that the first floating body assembly can have good hydrodynamic performance and is conducive to reducing resistance. In other embodiments, the first floating body assembly can also be of other types, which is not limited here.

[0091] The offshore hydrogen production system 100 also includes a desalination component 3, which is connected to the inlet end of the hydrogen production component 1, and is used to extract and desalinate salt in seawater. By adopting the above form, the side reactions and corrosion problems in the hydrogen production process can be reduced through the desalination component 3, so that the hydrogen production component 1 can be protected and the service life of the hydrogen production component 1 can be extended. In addition, the above form can also prevent impurities in seawater from affecting the efficiency of electrolysis, making the electrolysis process more efficient.

[0092] In this embodiment, the desalination component 3 is a component used in the prior art to desalinate salt in seawater, and includes a reverse osmosis membrane 31 and a pump. Specifically, the pump extracts seawater, and the extracted seawater can desalinate salt in the seawater through the reverse osmosis membrane 31. The above form not only improves the efficiency and quality of seawater desalination, but also reduces equipment investment and operating costs.

[0093] In specific use, the delivery pipe is a hose, and the height of the hose can be changed by a hose crane.

[0094] The hydrogen production assembly 1 includes an electrolysis section 11 and a purification section, the electrolysis section 11 and the purification section are connected, the electrolysis section 11 is used to electrolyze seawater to produce hydrogen, the purification section is connected to the inlet end of the liquefied storage assembly 2, and the purification section is used to purify the hydrogen produced by the electrolysis section 11. In the above form, the hydrogen produced by electrolysis in the electrolysis section 11 will enter the purification section, and the impurities and harmful substances that may exist will be removed by the purification section, so as to ensure the purity and safety of the hydrogen and meet the requirements of the low temperature compression section for the purity of the hydrogen.

[0095] During specific 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 produce hydrogen, thereby preventing impurities in the seawater from affecting the service life of the electrolysis unit 11.

[0096] 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.

[0097] The purification section includes a gas-liquid processor 12 and a purification component 13, the gas-liquid processor 12 and the purification component 13 are connected, the gas-liquid processor 12 is connected to the electrolysis section 11, the gas-liquid processor 12 is used to remove liquid from the hydrogen produced by electrolysis in the electrolysis section 11, and the purification component 13 is connected to the inlet end of the liquefied storage component 2, and the purification component 13 is used to remove impurities in the hydrogen. Specifically, the main function of the gas-liquid processor 12 is to remove liquid from the hydrogen produced during the electrolysis process, effectively separate the gas-liquid mixture, and ensure the efficiency and safety of the subsequent purification process. The purification component 13 further removes impurities in the hydrogen and improves the purity of the hydrogen to meet the high standards for liquefied storage and subsequent applications. The above form is adopted, not only the purity of the hydrogen is improved, but also the safety risks of hydrogen during storage and use are reduced by reducing the impurity content.

[0098] In this embodiment, the purification component 13 is a component used in the prior art to purify hydrogen and reduce impurities, and it may be a pressure swing adsorption (PSA) device, a membrane separator, or the like.

[0099] The offshore hydrogen production system 100 further includes a second floating assembly 4, on which the hydrogen production assembly 1 and the liquefied storage assembly 2 are both arranged. In the above form, the second floating assembly 4 provides a platform for the hydrogen production assembly 1 and the liquefied storage assembly 2. In addition, the liquefied storage assembly 2 is arranged in the second floating assembly 4, which can utilize the natural cooling characteristics of the marine environment to further reduce energy consumption and improve the economy of the system.

[0100] In this embodiment, the second floating assembly 4 can be designed as a ship type, which is beneficial to increase the platform deck area and increase the deck load, so that the second floating assembly 4 can have good hydrodynamic performance and is beneficial to reduce resistance. In other embodiments, the second floating assembly 4 can also be other types, which are not limited here.

[0101] In this embodiment, the liquefied storage component 2 is arranged in the storage compartment of the second floating body component 4; the hydrogen production component 1 and the desalination component 3 are arranged on the deck of the second floating body component 4. With the above form, the liquefied storage component 2 is arranged in the storage compartment of the second floating body component 4, which can ensure the stability and safety of liquid hydrogen during the storage process. Since liquid hydrogen needs to be stored at extremely low temperatures, the insulation performance of the storage compartment is crucial, which can effectively prevent the evaporation and heat loss of liquid hydrogen, thereby improving the storage efficiency; the hydrogen production component 1 is arranged on the deck to provide a stable platform support. In addition, with the above form, since the deck provides a relatively spacious working space, it is convenient for operators to carry out daily inspections and emergency maintenance work, which is conducive to the maintenance and monitoring of the hydrogen production component 1 and the desalination component 3.

[0102] In other embodiments, the locations of the liquefied storage assembly 2, the hydrogen production assembly 1 and the desalination assembly 3 on the second floating assembly 4 can be adjusted according to actual needs and are not limited here.

[0103] During actual use, the second floating assembly 4 is also equipped with a high-comfort living building and a helicopter platform to meet the living, entertainment, sports and catering, rapid transfer and emergency safety requirements of the platform personnel; the living building is equipped with a lifeboat to ensure the safe evacuation of platform personnel in emergency situations such as fire and explosion; and a deck crane is equipped to realize the installation, replacement, transportation and maintenance of the hydrogen production module and hydrogen compression and liquefaction module as well as platform supply.

[0104] In this embodiment, the material of the second floating assembly 4 is steel, which ensures the structural stability and durability of the floating assembly, so that it can withstand the harsh conditions in the marine environment. In other embodiments, the material of the second floating assembly 4 can be adjusted according to actual needs, which is not limited here.

[0105] like Figure 2As shown, the offshore hydrogen production system 100 further includes a mooring assembly 5, a mooring interface assembly 51 is provided on the second floating assembly 4, the mooring assembly 5 is connected to the mooring interface assembly 51, and the mooring assembly 5 is used to fix the second floating assembly 4. In the above form, the second floating assembly 4 can be fixed by the mooring assembly 5 to prevent it from being displaced or overturned due to natural forces such as wind and waves, thereby ensuring the stable operation of the entire hydrogen production system.

[0106] Specifically, the mooring interface assembly 51 includes a mooring interface 511 and a mooring part; wherein, when the number of mooring interfaces 511 is one, the mooring interface 511 is connected to the outer turret through the mooring part; when the number of mooring interfaces 511 is multiple, multiple mooring interfaces 511 are arranged along the circumference of the second floating assembly 4, and multiple mooring interfaces 511 are fixed to the seabed through the mooring part. In the above form, when there is only one mooring interface 511, it is connected to the outer turret through the mooring part, providing a direct and firm fixing point, ensuring the stability of the position of the second floating assembly 4 under severe sea conditions, preventing overturning due to wind and waves, and thus ensuring the safe operation of the hydrogen production equipment; when there are multiple mooring interfaces 511, they are arranged along the circumference of the second floating assembly 4, and are fixed to the seabed through the mooring part. This layout increases the fixing points, disperses the force, and is suitable for sea areas with relatively good environmental conditions.

[0107] 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 set on a ship and the mooring interface 511 can fix the second floating body assembly 4 on the seabed through a rope, and its shape can be a hook type or the like.

[0108] In addition, in specific use, the second floating body assembly 4 includes functional cabins (machinery equipment room), liquid tanks (fresh water tanks, ballast tanks, etc.), and empty tanks to store hydrogen and adjust the floating state of the integrated platform to make it more resistant to wind and waves. A cable path is planned on the main deck of the second figure assembly to facilitate the pre-laying of cables in a neat and uniform manner.

[0109] The offshore hydrogen production system 100 also includes a crane, which is installed on the deck. The coverage of the crane includes the hydrogen production component 1, the liquefied storage component 2 and the maintenance area. The crane is used to move between the maintenance area and the hydrogen production component 1 and the liquefied storage component 2. The above form is adopted to improve the operating efficiency and maintenance convenience of the entire system. The crane makes the transportation of materials in the maintenance area and between the hydrogen production component 1 and the liquefied storage component 2 faster and safer, reduces the labor intensity and risk of manual handling, and improves the operation efficiency. When the hydrogen production component 1 or the liquefied storage component 2 needs to be maintained, parts need to be replaced, or emergency repairs need to be carried out, the crane can quickly and accurately transport personnel, tools and materials to the designated location, ensuring the timeliness and effectiveness of the maintenance work.

[0110] In this embodiment, the coverage of the crane includes the desalination assembly 3, the hydrogen production assembly 1, the liquefaction assembly and the maintenance area, and the crane moves between two of the desalination assembly 3, the hydrogen production assembly 1, the liquefaction assembly and the maintenance area.

[0111] 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 is used to supply power to the hydrogen production component 1 and the liquefied storage component 2. 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 1 and the liquefied storage component 2. The control unit is used to receive the power supply status of the hydrogen production component 1 and the liquefied storage component 2, and control the opening and closing of the control switch according to the power supply status of the hydrogen production component 1 and the liquefied storage component 2. When the offshore hydrogen production system 100 is in a working state and the control unit receives that the hydrogen production component 1 and the liquefied storage component 2 are not powered, 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 that the hydrogen production component 1 and the liquefied storage component 2 are powered, the control unit controls the control switch to close. With the above form, when there is a power outage, the hydrogen production component 1 and the liquefied storage component 2 are powered by the emergency power generation component, thereby ensuring the normal operation of the hydrogen production component 1 and the liquefied storage component 2.

[0112] During specific use, the emergency power generation component and the power generation equipment can also supply power to the desalination component 3 and the external transmission component 6.

[0113] In this embodiment, electricity generated by offshore wind energy, wave energy, tidal energy and other new energy sources can be supplied to the hydrogen production component 1 and the liquefied storage component 2. The emergency power generation component is one or more of an emergency generator, an emergency switchboard, and a battery.

[0114] During specific use, seawater is extracted by a water pump, and the desalination component 3 of the reverse osmosis membrane 31 is used to desalinate the salt in the seawater. The seawater with reduced salt content can be electrolyzed by the electrolysis unit 11 to produce hydrogen, and the water and impurities in the hydrogen are removed in turn by the gas-liquid processor 12 and the purification component 13. Subsequently, the hydrogen passes through the booster pump 211, the compressor 212 and the cooling component 213 to convert the gaseous hydrogen into liquid hydrogen, and the liquid hydrogen is stored in the liquid hydrogen storage tank 22. Among them, the first outlet end of the liquid hydrogen storage tank 22 and the inlet end of the booster pump 211 are connected by a connecting pipe, and the liquefied hydrogen can be introduced into the inlet end of the booster pump 211, and the liquefied hydrogen is pressurized, compressed and cooled, and then becomes liquid hydrogen again, thereby improving the liquefaction rate of hydrogen and avoiding the 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 according to the distance between the offshore hydrogen production system 100 and the onshore storage assembly. When the offshore hydrogen production system 100 is far from the onshore storage assembly, the liquid hydrogen can be transported to the storage assembly of the first floating assembly, and the first floating assembly is used to transport the liquid hydrogen to land. When the offshore hydrogen production system 100 is close to the onshore storage assembly, hydrogen can be directly transported using a transportation pipeline for transporting oil, which reduces transportation costs.

[0115] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that these are only examples, and various changes or modifications may be made to these embodiments without departing from the principles and essence of the present invention. Therefore, the protection scope of the present invention is limited by the appended claims.

Claims

1. An offshore hydrogen production system, comprising a hydrogen production component, wherein the hydrogen production component is used to produce hydrogen using seawater, characterized in that: The offshore hydrogen production system further includes a liquefied storage component, the hydrogen production component is in communication with the liquefied storage component, and the liquefied storage component is used to liquefy hydrogen into liquid hydrogen and store the liquid hydrogen; The liquefied storage assembly includes a cryogenic compression unit and a liquid hydrogen storage tank. The cryogenic compression unit is connected to the liquid hydrogen storage tank. The cryogenic compression unit is connected to the hydrogen production assembly for converting gaseous hydrogen into liquid hydrogen. The liquid hydrogen storage tank is used to store liquid hydrogen.

2. The offshore hydrogen production system according to claim 1, characterized in that: The low-temperature compression part includes a booster pump, a compressor and a cooling component. The booster pump, the compressor and the cooling component are connected in sequence. The booster pump is connected to the hydrogen production component. The booster pump is used to increase the pressure of the hydrogen. The compressor is used to compress the hydrogen. The cooling component is used to cool the hydrogen to convert the gaseous hydrogen into liquid hydrogen.

3. The offshore hydrogen production system according to claim 1, characterized in that: The offshore hydrogen production system also 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 part. The secondary liquefaction component is used to transfer liquefied gaseous hydrogen in the liquid hydrogen storage tank to the cryogenic compression part.

4. The offshore hydrogen production system according to claim 3, characterized in that: The secondary liquefaction assembly includes a connecting pipe, which is used to connect the first outlet end of the liquid hydrogen storage tank and the inlet end of the cryogenic compression part; Preferably, the offshore hydrogen production system further includes an external transport component, which is connected to the second outlet end of the liquid hydrogen storage tank, and is used to transport the liquid hydrogen stored in the liquid hydrogen storage tank; wherein, in the vertical direction, the second outlet end is lower than the first outlet end.

5. The offshore hydrogen production system according to claim 1, characterized in that: The offshore hydrogen production system further includes an external transmission component, the external transmission component is connected to the outlet end of the liquefied storage component, and the external transmission component is used to transport the liquid hydrogen stored in the liquid hydrogen storage tank; Preferably, the external transmission component includes a first external transmission part and an oil transportation pipe, the two ends of the oil transportation pipe are respectively connected and communicated with the liquefied storage component and the onshore storage component, the first external transmission part is arranged on the oil transportation pipe, and the first external transmission part is used to provide power for the transportation of liquid hydrogen in the oil transportation pipe; or, the external transmission component includes a second external transmission part, a transportation pipe and a first floating body component, the two ends of the transportation pipe are respectively connected and communicated with the liquefied storage component and the storage component of the first floating body component, the second external transmission part is arranged on the first floating body component, and the second external transmission part is used to provide power for the transportation of liquid hydrogen in the transportation pipe.

6. The offshore hydrogen production system according to claim 1, characterized in that: The offshore hydrogen production system further comprises a desalination component, the desalination component is connected to the inlet end of the hydrogen production component, and the desalination component is used to extract and desalinate salt in seawater; preferably, the desalination component comprises a reverse osmosis membrane; And / or, the hydrogen production component includes an electrolysis part and a purification part, the electrolysis part and the purification part are connected, the electrolysis part is used to electrolyze seawater to produce hydrogen, the purification part is connected to the inlet end of the liquefied storage component, and the purification part is used to purify the hydrogen produced by the electrolysis part; preferably, the purification part 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 part, the gas-liquid processor is used to remove liquid from the hydrogen produced by electrolysis in the electrolysis part, the purification component is connected to the inlet end of the liquefied storage component, and the purification component is used to remove impurities in the hydrogen.

7. The offshore hydrogen production system according to claim 1, characterized in that: The offshore hydrogen production system further comprises a second floating assembly, on which the hydrogen production assembly and the liquefied storage assembly are both arranged; Preferably, the liquefied storage assembly is disposed in a storage compartment of the second floating assembly; and / or the hydrogen production assembly is disposed on a deck of the second floating assembly.

8. The offshore hydrogen production system according to claim 7, characterized in that: The second floating body assembly is made of steel; and / or, the second buoyancy assembly is a ship; And / or, the offshore hydrogen production system also includes a crane, which is installed on the deck, and the coverage of the crane includes the hydrogen production component and / or the liquefied storage component and a maintenance area, and the crane is used to move between the maintenance area and the hydrogen production component and / or the liquefied storage component.

9. The offshore hydrogen production system according to claim 7, characterized in that: The offshore hydrogen production system further comprises a mooring assembly, the second floating body assembly is provided with a mooring interface assembly, the mooring assembly is connected to the mooring interface assembly, and the mooring assembly is used to fix the second floating body assembly; Preferably, the mooring interface assembly comprises a mooring interface and a mooring portion; Wherein, when the number of the mooring interface is one, the mooring interface is connected to the outer turret through the mooring portion; When there are multiple mooring interfaces, the multiple mooring interfaces are arranged along the circumference of the second floating body assembly, and the multiple mooring interfaces are all fixed to the seabed through the mooring part.

10. The offshore hydrogen production system according to claim 1, characterized in that: The offshore hydrogen production system further comprises an emergency power generation component, a control switch and a control unit, wherein the emergency power generation component is used to supply power to the hydrogen production component and / or the liquefied 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 liquefied storage component. The control unit is used to receive the power supply status of the hydrogen production component and / or the liquefied 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 liquefied storage component; Wherein, when the offshore hydrogen production system is in working state, and the control unit receives that the hydrogen production component and / or the liquefied storage component is not powered, the control unit controls the control switch to be turned on, so as to power the hydrogen production component and / or the liquefied storage component through the emergency power generation component; When the control unit receives power from the hydrogen production component and / or the liquefied storage component, the control unit controls the control switch to close; Preferably, the emergency power generation component is one or more of an emergency generator, an emergency switchboard, and a battery.

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