A wind energy driven seawater decoupling electrolysis hydrogen production and methanol generation integrated system and operation method

Abstract

The application discloses a wind energy driven seawater decoupling electrolysis hydrogen production and methanol generation integrated system and an operation method, and relates to the field of seawater electrolysis hydrogen production and methanol synthesis. The system comprises a power supply module, a seawater decoupling electrolysis hydrogen production module and a carbon dioxide capture and methanol synthesis module. The power supply module supplies power to the seawater decoupling electrolysis hydrogen production module; the seawater decoupling electrolysis hydrogen production module comprises a hydrogen evolution electrolytic cell, a multiphase reactor and a redox medium circulation loop, hydrogen evolution reaction occurs in the cathode area of the hydrogen evolution electrolytic cell, oxidation reaction of the redox medium occurs in the anode area, the oxidized redox medium enters the multiphase reactor, is regenerated under the action of a catalyst and releases oxygen. The carbon dioxide capture and methanol synthesis module captures carbon dioxide, and the captured carbon dioxide is mixed with hydrogen produced by the seawater decoupling electrolysis hydrogen production module and then enters a methanol reactor to perform methanol synthesis. The system can reduce chlorine related side reactions and hydrogen oxygen mixing risks and improve integrated utilization capacity.

Description

Technical Field

[0001] This invention relates to the field of seawater electrolysis for hydrogen production and green methanol synthesis technology, and more specifically, to an integrated system and operation method for wind-powered decoupled seawater electrolysis for hydrogen production and methanol generation. Background Technology

[0002] Hydrogen energy, characterized by its cleanliness, high energy density, and suitability as a renewable energy storage medium, is an important direction for building a low-carbon energy system. Electrolysis of water can convert renewable energy sources such as wind and solar power into hydrogen energy. However, existing water electrolysis technologies primarily use freshwater or high-purity water as raw materials, which may lead to issues such as freshwater consumption, pretreatment costs, and system layout space requirements when applied on a large scale. Especially in offshore wind power scenarios, freshwater supply, seawater desalination equipment placement, and hydrogen storage and transportation all increase system complexity.

[0003] Seawater resources are abundant, and direct use for electrolytic hydrogen production could reduce dependence on freshwater resources and facilitate the local utilization of offshore wind power. However, seawater contains large amounts of chloride, magnesium, calcium, and other impurity ions, which can easily cause problems such as anodic chlorination side reactions, electrode corrosion, membrane fouling, and catalyst deactivation in traditional electrolysis systems, thus affecting electrolysis efficiency, operational life, and system safety. Therefore, developing low-side-reaction, long-life electrolytic hydrogen production systems suitable for seawater environments remains a crucial technical challenge for offshore renewable energy hydrogen production.

[0004] On the other hand, hydrogen has a low volumetric energy density, resulting in high costs for offshore storage and long-distance transportation. Synthesizing methanol from green hydrogen and renewable carbon dioxide can convert hydrogen energy into easily stored and transportable liquid fuels and chemical feedstocks, helping to improve the energy conversion and product output flexibility of offshore wind power hydrogen production systems. While existing carbon dioxide hydrogenation to methanol technology has been extensively researched and demonstrated, its coupling with offshore wind power, direct seawater hydrogen production, and offshore platform operation still faces challenges such as insufficient system integration, inadequate adaptability to load fluctuations, and complex hydrogen storage and transportation processes.

[0005] Therefore, there is an urgent need to propose an integrated system that can couple offshore wind power, seawater electrolysis for hydrogen production, carbon dioxide capture, and methanol synthesis. This system would use offshore wind power to drive seawater electrolysis for hydrogen production, and then further use the produced hydrogen for methanol synthesis, thereby improving the efficiency of on-site conversion, storage, and utilization of offshore renewable energy. Summary of the Invention

[0006] The purpose of this invention is to provide an integrated system and operation method for wind-driven seawater decoupled electrolysis hydrogen production and methanol generation, in order to solve the problems of high freshwater dependence, numerous side reactions in direct seawater electrolysis, difficulties in hydrogen storage and transportation, and insufficient coupling between hydrogen production and downstream chemical synthesis in existing offshore wind power hydrogen production systems. This invention helps to reduce the risk of chlorine-related side reactions and hydrogen-oxygen mixing during seawater electrolysis, and improves the integrated utilization capability of offshore wind power hydrogen production and liquid fuel synthesis.

[0007] A wind-powered integrated system for decoupled seawater electrolysis hydrogen production and methanol synthesis includes: a power supply module, a seawater decoupled electrolysis hydrogen production module, and a carbon dioxide capture and methanol synthesis module. The power supply module is electrically connected to the seawater decoupled electrolysis hydrogen production module. It obtains power from the offshore wind turbine and converts it into DC power through a rectifier to supply power to the seawater decoupled electrolysis hydrogen production module. The seawater decoupled electrolysis hydrogen production module includes a hydrogen evolution electrolysis cell, a multiphase reactor, and a redox medium circulation loop for circulating between the hydrogen evolution electrolysis cell and the multiphase reactor. The hydrogen evolution electrolytic cell includes a cathode region and an anode region. The cathode region is used for the hydrogen evolution reaction, and the anode region is used for the oxidation reaction of the redox medium. The multiphase reactor is used to cause the redox medium after oxidation in the anodic region to undergo a chemical reaction and release oxygen. The redox medium after the reaction is returned to the anodic region of the hydrogen evolution electrolysis cell. The carbon dioxide capture and methanol synthesis module includes a carbon dioxide trap, a gas mixing unit, and a methanol reactor. The hydrogen produced by the seawater decoupled electrolysis hydrogen production module is mixed with the carbon dioxide provided by the carbon dioxide trap in the gas mixing unit and then enters the methanol reactor for methanol synthesis.

[0008] Furthermore, the power supply module includes an offshore wind turbine generator set.

[0009] Furthermore, the molar ratio of carbon dioxide to hydrogen entering the methanol reactor is 1:3 to 1:5.

[0010] Furthermore, the redox medium is ferricyanide [Fe(CN)6]. 3- And ferrocyanate [Fe(CN)6] 4- The formed ion-coupling pair, the seawater decoupled electrolysis hydrogen production module further includes an anode storage tank, a cathode storage tank, a first circulation pump, a second circulation pump, an anion exchange membrane, a hydrogen dryer, and an oxygen dryer; wherein, the anode region contains the redox medium, [Fe(CN)6]. 4- It is oxidized to [Fe(CN)6] in the anodic region. 3- ; The first circulating pump is used to process [Fe(CN)6] 3- The anolyte is delivered to the multiphase reactor; The multiphase reactor contains a catalyst, NiFe(OH)2, and at a set temperature, [Fe(CN)6]... 3- A spontaneous chemical oxygen evolution reaction occurs in the multiphase reactor to generate [Fe(CN)6]. 4- And release oxygen; The second circulation pump is used to return the electrolyte after the reaction in the multiphase reactor to the anode region; The cathode region is used for the hydrogen evolution reaction, and the anion exchange membrane is disposed between the anode region and the cathode region to allow OH- to undergo the reaction. - It migrates between the cathode and anode regions; The hydrogen produced in the cathode region is processed by the hydrogen dryer and then output, and the oxygen produced in the multiphase reactor is processed by the oxygen dryer and then output.

[0011] Furthermore, it also includes an intelligent control module, which is connected to the power supply module, the seawater decoupled electrolysis hydrogen production module, and the carbon dioxide capture and methanol synthesis module, respectively, and is used to adjust the system operating status according to the power supply, grid demand, and product demand.

[0012] Furthermore, the intelligent control module is configured to: prioritize allocating electrical energy to the seawater decoupled electrolysis hydrogen production module when there is surplus power supply, and reduce the methanol synthesis load or adjust the product output ratio when the demand for electricity increases and / or the demand for external power transmission increases.

[0013] Furthermore, the power supply module, the seawater decoupled electrolysis hydrogen production module, and the carbon dioxide capture and methanol synthesis module are integrated on the same offshore platform, or respectively installed on adjacent offshore platforms and connected by pipelines and cables.

[0014] An operation method for a wind-powered integrated system for decoupled seawater electrolysis hydrogen production and methanol generation, characterized in that, based on the wind-powered integrated system for decoupled seawater electrolysis hydrogen production and methanol generation as described in any of the preceding claims, it includes the following steps: S1, the power supply module supplies power to the seawater decoupled electrolysis hydrogen production module, the hydrogen evolution reaction is carried out in the cathode area of ​​the hydrogen evolution electrolysis cell, and the oxidation reaction of the redox medium is carried out in the anode area; S2, the redox medium after oxidation in the anode zone is transported to the multiphase reactor, where a chemical reaction takes place and oxygen is released. The redox medium after the reaction is then transported back to the anode zone. S3 transports the hydrogen produced by the seawater decoupled electrolysis hydrogen production module to the carbon dioxide capture and methanol synthesis module, and mixes it with the captured carbon dioxide before sending it into the methanol reactor for methanol synthesis. S4 adjusts the operating load of the seawater decoupled electrolysis hydrogen production module and the carbon dioxide capture and methanol synthesis module according to the power supply, load requirements and / or product requirements.

[0015] A thermal integration method for a wind-driven seawater decoupled electrolysis hydrogen production and methanol generation integrated system is characterized in that, based on the wind-driven seawater decoupled electrolysis hydrogen production and methanol generation integrated system as described above, the reaction heat and / or high-temperature process material generated by the methanol synthesis module are transferred to the electrolyte in the seawater decoupled electrolysis hydrogen production module through a heat exchange device to preheat the electrolyte.

[0016] The beneficial effects of this invention include: This invention employs a seawater decoupled electrolysis hydrogen production module, which uses an oxidation-reduction medium to circulate between the hydrogen evolution electrolysis cell and the multiphase reactor, thereby spatially separating the hydrogen evolution reaction from the oxygen evolution-related reaction. This helps reduce the risk of hydrogen and oxygen gas mixing and improves the safety of system operation.

[0017] This invention replaces some electrochemical steps in the traditional direct oxygen evolution process at the anode with a redox medium, so that the anode region mainly undergoes a medium oxidation reaction, thereby reducing the possibility of chloride ions in seawater directly participating in the anode side reaction and improving the stability of the seawater electrolysis system.

[0018] This invention integrates offshore wind power, seawater decoupled electrolysis for hydrogen production, carbon dioxide capture, and methanol synthesis into a single system. It can convert offshore wind power into storable products such as hydrogen and methanol, reducing the need for long-distance transportation of hydrogen at sea and improving the local consumption capacity of renewable energy.

[0019] This invention uses a carbon dioxide capture and methanol synthesis module to further convert hydrogen produced by seawater electrolysis into methanol, which improves the convenience of hydrogen energy storage and transportation, and provides a systematic solution for the preparation of green fuels and green chemical raw materials.

[0020] This invention can improve the system's adaptability to renewable energy fluctuations by adjusting the operating load of each module according to wind power output, grid demand, and product demand through an intelligent control module.

[0021] This invention can be installed on the same or adjacent offshore platforms, facilitating modular deployment, operation, and maintenance in offshore wind power scenarios. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a structural block diagram of the system according to an embodiment of the present invention. Detailed Implementation

[0024] All features disclosed in all embodiments of this specification, or steps in all methods or processes implied in the disclosure, may be combined and / or extended or replaced in any way, except for mutually exclusive features and / or steps.

[0025] Example 1: A wind-powered integrated system for decoupled seawater electrolysis to produce hydrogen and methanol. like Figure 1 As shown, this embodiment provides a wind-powered integrated system for decoupled seawater electrolysis hydrogen production and methanol generation, including a power supply module, a seawater decoupled electrolysis hydrogen production module, and a carbon dioxide capture and methanol synthesis module.

[0026] The power supply module includes an offshore wind turbine generator set, which is electrically connected to a seawater decoupled electrolysis hydrogen production module via a power conversion device to supply power to the hydrogen evolution electrolyzer. The power conversion device may include a rectifier, a voltage regulator, and a control unit to adapt to fluctuations in offshore wind power output.

[0027] The seawater decoupled electrolysis hydrogen production module includes a hydrogen evolution electrolyzer, a multiphase reactor, an anode storage tank, a cathode storage tank, a first circulation pump, a second circulation pump, an anion exchange membrane, a hydrogen dryer, and an oxygen dryer. The hydrogen evolution electrolyzer is divided into a cathode region and an anode region by the anion exchange membrane. The cathode region is used for the hydrogen evolution reaction, and the anode region is used for the oxidation reaction in the redox medium.

[0028] In this embodiment, the anolyte comprises alkaline seawater and [Fe(CN)6]. 4- / [Fe(CN)6] 3- Redox medium. During operation, [Fe(CN)6] 4- It is oxidized to [Fe(CN)6] in the anodic region. 3- It contains [Fe(CN)6] 3- The anolyte is pumped to the multiphase reactor via a first circulation pump. The multiphase reactor contains a catalyst, NiFe(OH)₂, to promote the reaction of [Fe(CN)₆]. 3- It undergoes a chemical reaction and is converted into [Fe(CN)6]. 4-Simultaneously, oxygen is released. The anolyte after the reaction is returned to the anode area of ​​the hydrogen evolution electrolysis cell via a second circulation pump, realizing the recycling of the redox medium.

[0029] Hydrogen evolution occurs in the cathode region. The generated hydrogen gas is treated by a hydrogen dryer and then enters a hydrogen buffer tank or is directly transported to the carbon dioxide capture and methanol synthesis module. Alkaline seawater is periodically or continuously replenished to the cathode storage tank or cathode region via external pipelines to maintain stable liquid levels and material balance in the electrolysis system. Oxygen generated in the multiphase reactor is treated by an oxygen dryer before being output or stored. Anion exchange membranes are used to separate the anode and cathode regions and allow OH- to pass through. - They migrate between the cathode and anode regions to maintain ion conduction and charge balance within the electrolytic cell.

[0030] The carbon dioxide capture and methanol synthesis module includes a carbon dioxide trap, a carbon dioxide dryer, a gas mixing unit, a gas compressor, a methanol reactor, a methanol separator, a methanol distillation column, and a methanol storage tank. Air or carbon dioxide-containing gas enters the carbon dioxide trap for capture. The captured carbon dioxide is dried and then enters the gas mixing unit. Hydrogen from the seawater decoupled electrolysis hydrogen production module is mixed with carbon dioxide in the gas mixing unit. The mixed gas is pressurized by the gas compressor and then enters the methanol reactor, where it reacts to produce methanol under the action of a methanol synthesis catalyst.

[0031] The product stream from the methanol reactor enters a methanol separator for gas-liquid separation. The liquid phase is then purified in a methanol distillation column, and the resulting methanol is stored in a methanol storage tank. Unreacted gaseous components can be returned to the gas mixing unit or used for heat exchange within the system to improve material utilization.

[0032] Example 2: Operation method of a wind-powered integrated system for decoupled seawater electrolysis hydrogen production and methanol generation This embodiment provides a method for operating the integrated system described in Embodiment 1, including the following steps: First, the electricity generated by the offshore wind turbine is processed by a power conversion device and then input into the hydrogen evolution electrolyzer. After the hydrogen evolution electrolyzer is started, a hydrogen evolution reaction occurs in the cathode region, producing hydrogen gas; [Fe(CN)6] in the anode region... 4- An oxidation reaction occurs, producing [Fe(CN)6]. 3- .

[0033] Subsequently, [Fe(CN)6] is present. 3- The anolyte is pumped to the multiphase reactor via a first circulation pump. In the multiphase reactor, [Fe(CN)6]... 3- A chemical reaction occurs under the action of the catalyst NiFe(OH)2 to produce [Fe(CN)6]. 4-It also releases oxygen. The electrolyte after the reaction is returned to the anode area of ​​the hydrogen evolution electrolysis cell by the second circulation pump, thus completing the redox medium cycle.

[0034] Meanwhile, the hydrogen produced in the cathode region is dried and then enters the gas mixing unit. A carbon dioxide trap captures carbon dioxide from the air or a carbon dioxide-containing gas; the captured carbon dioxide is dried and then mixed with hydrogen. Preferably, the molar ratio of carbon dioxide to hydrogen entering the methanol reactor is 1:3 to 1:5. The mixed gas is compressed and then enters the methanol reactor, where the carbon dioxide hydrogenation to methanol reaction takes place under the action of a catalyst.

[0035] After the reaction products are separated by a methanol separator, the liquid phase enters a methanol distillation column to obtain methanol products; the unreacted gas can be refluxed to the gas mixing unit or used to preheat the feed gas, electrolyte or other process streams.

[0036] Example 3: Intelligent control and operation mode of a wind-powered integrated system for decoupled seawater electrolysis hydrogen production and methanol generation In this embodiment, the system of Embodiment 1 further includes an intelligent control module. The intelligent control module is connected to the offshore wind turbine generator, the power conversion device, the hydrogen evolution electrolyzer, the circulating pump, the carbon dioxide trap, the gas compressor, and the methanol reactor, respectively.

[0037] When the offshore wind power output is high, the intelligent control module increases the operating load of the hydrogen evolution electrolyzer and increases the circulation flow of the redox medium to increase hydrogen production; at the same time, it increases the feed rate of the methanol reactor according to the hydrogen production to further convert hydrogen into methanol.

[0038] When the output of offshore wind power decreases, the intelligent control module reduces the operating load of the hydrogen evolution electrolyzer and correspondingly reduces the feed rate of the methanol synthesis module. If the system is equipped with a hydrogen buffer tank or a methanol storage tank, the system operation can be balanced by adjusting the amount of hydrogen temporarily stored and the amount of methanol output.

[0039] When external power demand increases or the platform's operating load changes, the intelligent control module can adjust the power distribution between the power supply module and the hydrogen production module, methanol synthesis module, and external load, enabling the system to switch between hydrogen production, methanol production, and power output.

[0040] Example 4: A thermal integration method for a wind-powered integrated system for decoupled seawater electrolysis hydrogen production and methanol generation. In this embodiment, the system of Example 1 further includes a heat exchange device. The reaction heat or high-temperature process stream generated by the methanol synthesis reaction is exchanged with the electrolyte in the seawater decoupled electrolysis hydrogen production module through the heat exchange device to preheat the electrolyte entering the hydrogen evolution electrolysis cell or multiphase reactor.

[0041] The above-mentioned thermal integration method can improve the internal heat utilization rate of the system, reduce the demand for external heat sources, and help improve the integrated operation efficiency under offshore platform conditions.

[0042] Based on the above embodiments, this invention proposes a unique system architecture and a new application method for chemical media, which can efficiently and safely achieve the integration of direct seawater electrolysis for hydrogen production and methanol synthesis driven by offshore wind power.

[0043] It should be noted that, within the scope of protection defined in the claims of this invention, the following embodiments can be combined and / or extended or replaced in any logical manner from the above specific embodiments, such as the disclosed technical principles, disclosed technical features or implicitly disclosed technical features.

[0044] In optional implementations, based on the above-described embodiments, except for [Fe(CN)6] 3- Other redox mediators can also be considered, such as [Co(bpy)3]. 2+ Exploring more efficient and stable redox media such as [Ni(OH)2], etc. Mixed redox media, such as [Fe(CN)6], can be used. 3- With [Co(bpy)3] 2+ By using a combination of methods, the system can adapt to the corrosion and material consumption that may be caused by complex elements in seawater, thereby improving system performance and stability.

[0045] In optional embodiments, the catalyst in the multiphase reactor is not limited to NiFe(OH)2, but may also be other catalyst materials capable of promoting the regeneration of the redox medium and accompanying the oxygen evolution process. In some embodiments, the NiFe(OH)2 catalyst can be in-situ transformed during operation to form active hydroxyl oxide structures such as NiFe-LDH and NiFeOOH, thereby improving the oxygen evolution reaction activity and catalytic stability.

[0046] In an optional embodiment, the power supply module, the seawater decoupled electrolysis hydrogen production module, and the carbon dioxide capture and methanol synthesis module can be integrated on the same offshore platform, or respectively installed on adjacent offshore platforms and connected by pipelines and cables.

[0047] In an alternative implementation, the system may also employ a modular design, allowing the electrolyzer, multiphase reactor, carbon dioxide trap, and methanol reactor to be combined and configured according to the space conditions of the offshore platform, the scale of the wind farm, and product requirements.

[0048] In an optional embodiment, the methanol synthesis catalyst may be a Cu-ZnO-Al2O3 catalyst system, or a ZnO-ZrO2 catalyst system or a CeO2 catalyst system. -Cu catalyst system or other carbon dioxide hydrogenation to methanol catalyst system.

[0049] In an optional implementation, the system may further include an ammonia synthesis module, a hydrocarbon synthesis module, or other downstream chemical synthesis modules to utilize hydrogen generated from the seawater decoupled electrolysis hydrogen production module for multi-product conversion.

[0050] In summary, this invention uses a redox medium cycle to spatially separate the hydrogen evolution reaction from the oxygen evolution-related reaction, which helps reduce the risk of chlorine-related side reactions and hydrogen-oxygen mixing during seawater electrolysis. At the same time, the hydrogen produced by offshore wind power can be further used for the hydrogenation of carbon dioxide to methanol, which helps reduce the pressure on offshore hydrogen storage and transportation and improves the ability to convert and utilize offshore renewable energy on-site.

[0051] In addition to the embodiments described above, those skilled in the art can make equivalent substitutions or modifications to the specific structure, connection method, operating conditions, and material selection of the present invention based on the disclosure of this invention. All equivalent substitutions or modifications made within the scope of protection defined by the claims of this invention shall fall within the protection scope of this invention.

Claims

1. A wind-powered integrated system for decoupled seawater electrolysis to produce hydrogen and methanol, characterized in that, include: Power supply module, seawater decoupled electrolysis hydrogen production module, and carbon dioxide capture and methanol synthesis module; The power supply module is electrically connected to the seawater decoupled electrolysis hydrogen production module. It obtains power from the offshore wind turbine and converts it into DC power through a rectifier to supply power to the seawater decoupled electrolysis hydrogen production module. The seawater decoupled electrolysis hydrogen production module includes a hydrogen evolution electrolysis cell, a multiphase reactor, and a redox medium circulation loop for circulating between the hydrogen evolution electrolysis cell and the multiphase reactor. The hydrogen evolution electrolytic cell includes a cathode region and an anode region. The cathode region is used for the hydrogen evolution reaction, and the anode region is used for the oxidation reaction of the redox medium. The multiphase reactor is used to cause the redox medium after oxidation in the anodic region to undergo a chemical reaction and release oxygen. The redox medium after the reaction is returned to the anodic region of the hydrogen evolution electrolysis cell. The carbon dioxide capture and methanol synthesis module includes a carbon dioxide trap, a gas mixing unit, and a methanol reactor. The hydrogen produced by the seawater decoupled electrolysis hydrogen production module is mixed with the carbon dioxide provided by the carbon dioxide trap in the gas mixing unit and then enters the methanol reactor for methanol synthesis.

2. The wind-powered, seawater decoupled electrolysis hydrogen production and methanol generation integrated system according to claim 1, characterized in that, The power supply module includes an offshore wind turbine generator set.

3. The wind-powered, seawater decoupled electrolysis hydrogen production and methanol generation integrated system according to claim 1, characterized in that, The molar ratio of carbon dioxide to hydrogen entering the methanol reactor is 1:3 to 1:

5.

4. The wind-powered, seawater decoupled electrolysis hydrogen production and methanol generation integrated system according to claim 1, characterized in that, The redox medium is ferricyanide [Fe(CN)6]. 3- And ferrocyanate [Fe(CN)6] 4- The formed ion-coupling pair, the seawater decoupled electrolysis hydrogen production module further includes an anode storage tank, a cathode storage tank, a first circulation pump, a second circulation pump, an anion exchange membrane, a hydrogen dryer, and an oxygen dryer; wherein, the anode region contains the redox medium, [Fe(CN)6]. 4- It is oxidized to [Fe(CN)6] in the anodic region. 3- ; The first circulating pump is used to process [Fe(CN)6] 3- The anolyte is delivered to the multiphase reactor; The multiphase reactor contains a catalyst, NiFe(OH)2, and at a set temperature, [Fe(CN)6]... 3- A spontaneous chemical oxygen evolution reaction occurs in the multiphase reactor to generate [Fe(CN)6]. 4- And release oxygen; The second circulation pump is used to return the electrolyte after the reaction in the multiphase reactor to the anode region; The cathode region is used for the hydrogen evolution reaction, and the anion exchange membrane is disposed between the anode region and the cathode region to allow OH- to undergo the reaction. - It migrates between the cathode and anode regions; The hydrogen produced in the cathode region is processed by the hydrogen dryer and then output, and the oxygen produced in the multiphase reactor is processed by the oxygen dryer and then output.

5. The wind-powered, seawater decoupled electrolysis hydrogen production and methanol generation integrated system according to claim 1, characterized in that, It also includes an intelligent control module, which is connected to the power supply module, the seawater decoupled electrolysis hydrogen production module, and the carbon dioxide capture and methanol synthesis module, respectively, and is used to adjust the system operating status according to the power supply, grid demand and product demand.

6. The wind-powered, seawater decoupled electrolysis hydrogen production and methanol generation integrated system according to claim 1, characterized in that, The intelligent control module is configured to: prioritize the allocation of power to the seawater decoupled electrolysis hydrogen production module when there is a surplus of power supply, and reduce the methanol synthesis load or adjust the product output ratio when the demand for electricity increases and / or the demand for external power transmission increases.

7. The wind-powered, seawater decoupled electrolysis hydrogen production and methanol generation integrated system according to claim 1, characterized in that, The power supply module, the seawater decoupled electrolysis hydrogen production module, and the carbon dioxide capture and methanol synthesis module are integrated on the same offshore platform, or are respectively installed on adjacent offshore platforms and connected by pipelines and cables.

8. A method for operating a wind-powered integrated system for decoupled seawater electrolysis to produce hydrogen and methanol, characterized in that, The wind-powered seawater decoupled electrolysis hydrogen production and methanol generation integrated system based on any one of claims 1 to 7 includes the following steps: S1, the power supply module supplies power to the seawater decoupled electrolysis hydrogen production module, the hydrogen evolution reaction is carried out in the cathode area of ​​the hydrogen evolution electrolysis cell, and the oxidation reaction of the redox medium is carried out in the anode area; S2, the redox medium after oxidation in the anode zone is transported to the multiphase reactor, where a chemical reaction takes place and oxygen is released. The redox medium after the reaction is then transported back to the anode zone. S3 transports the hydrogen produced by the seawater decoupled electrolysis hydrogen production module to the carbon dioxide capture and methanol synthesis module, and mixes it with the captured carbon dioxide before sending it into the methanol reactor for methanol synthesis. S4 adjusts the operating load of the seawater decoupled electrolysis hydrogen production module and the carbon dioxide capture and methanol synthesis module according to the power supply, load requirements and / or product requirements.

9. A thermal integration method for a wind-powered, seawater decoupled electrolysis hydrogen production and methanol generation integrated system, characterized in that, Based on the wind-powered seawater decoupled electrolysis hydrogen production and methanol generation integrated system according to any one of claims 1 to 7, the reaction heat and / or high-temperature process material generated by the methanol synthesis module are transferred to the electrolyte in the seawater decoupled electrolysis hydrogen production module through a heat exchange device to preheat the electrolyte.

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