Methane production equipment system and methane production method using ocean energy and resources

Abstract

The present invention relates to a methane production equipment system and methane production method using ocean energy and resources. Said methane production equipment system comprises an offshore power generation device, an electrolytic hydrogen production device, a seawater carbon capture device and a methane synthesis device. The electrolytic hydrogen production device, the seawater carbon capture device and the methane synthesis device are separately electrically connected to the offshore power generation device. The offshore power generation device supplies power to the electrolytic hydrogen production device, the seawater carbon capture device and the methane synthesis device. The electrolytic hydrogen production device produces hydrogen and supplies hydrogen to the methane synthesis device; the seawater carbon capture device produces carbon dioxide and supplies carbon dioxide to the methane synthesis device; and the methane synthesis device uses hydrogen and carbon dioxide to produce methane. By means of organically combining offshore power generation, offshore hydrogen production, seawater carbon capture, green methane, etc., said methane production equipment system provides a technical path for high-quality and large-scale development of offshore wind power resources.

Description

Methane production equipment systems and methods utilizing marine energy and resources Technical Field

[0001] This invention relates to the field of new energy technology, and in particular to a methane production equipment system and method utilizing marine energy and resources. Background Technology

[0002] As an important component of clean energy, marine renewable energy sources such as offshore wind power have attracted widespread attention due to their abundant resources and huge development potential. However, the development and utilization of marine renewable energy sources face multiple challenges, including strong fluctuations in power generation, long distances from shore, and high electricity transmission costs, resulting in difficulties in utilization. Summary of the Invention

[0003] Therefore, it is necessary to provide a methane production equipment system and a methane production method that utilizes marine energy and resources to solve the problem of difficulties in utilizing offshore wind power.

[0004] One objective of this invention is to provide a methane production equipment system utilizing marine energy and resources, as follows:

[0005] A methane production equipment system utilizing marine energy and resources includes an offshore power generation unit, an electrolysis hydrogen production unit, a seawater carbon capture unit, and a methane synthesis unit.

[0006] The electrolytic hydrogen production unit, the seawater carbon capture unit, and the methane synthesis unit are respectively electrically connected to the offshore power generation unit, and the offshore power generation unit is used to supply power to the electrolytic hydrogen production unit, the seawater carbon capture unit, and the methane synthesis unit;

[0007] The electrolytic hydrogen production unit is used to produce hydrogen and supply hydrogen to the methane synthesis unit; the seawater carbon capture unit is used to produce carbon dioxide and supply carbon dioxide to the methane synthesis unit; the methane synthesis unit is used to produce methane using the hydrogen and the carbon dioxide.

[0008] In one embodiment, the offshore power generation device includes a wind turbine.

[0009] In one embodiment, the offshore power generation device further includes an AC-DC rectifier, one end of which is connected to the wind turbine and the other end of which is connected to the electrolysis hydrogen production device. The AC-DC rectifier is used to convert the alternating current generated by the wind turbine into direct current, and then supply it to the electrolysis hydrogen production device after rectification and filtering.

[0010] In one embodiment, the offshore power generation device further includes an electrochemical energy storage system connected to the wind turbine for storing surplus electrical energy.

[0011] In one embodiment, the electrolytic hydrogen production device includes a pure water storage tank, an electrolyzer, a first compressor, and a hydrogen storage tank connected in sequence.

[0012] In one embodiment, the electrolyzer includes an alkaline electrolyzer and a proton exchange membrane electrolyzer.

[0013] In one embodiment, the seawater carbon capture device includes an electrochemical reactor, a second compressor, and a carbon dioxide storage tank connected in sequence.

[0014] In one embodiment, the methane synthesis apparatus includes a fixed-bed methane reactor, a methane cooler, a methane separator, and a methane storage tank connected in sequence. In another embodiment, the methane production equipment system further includes a seawater desalination unit, and the offshore power generation unit is used to supply power to the seawater desalination unit, which produces desalinated water and supplies it to the electrolytic hydrogen production unit.

[0015] In one embodiment, the seawater desalination device includes a seawater pretreatment component, an ultrafiltration and reverse osmosis component, and an ultrapure water production component connected in sequence.

[0016] Another objective of this invention is to provide a method for producing methane using marine energy and resources, as follows:

[0017] A method for producing methane using marine energy and resources, utilizing the methane production equipment system described in any of the above embodiments, the methane production method comprising the following steps:

[0018] The offshore power generation unit supplies power to the electrolytic hydrogen production unit, the seawater carbon capture unit, and the methane synthesis unit;

[0019] Hydrogen is produced using the electrolytic hydrogen production device and supplied to the methane synthesis device;

[0020] Carbon dioxide is produced using the seawater carbon capture device and supplied to the methane synthesis device;

[0021] Methane is produced using the methane synthesis apparatus with the hydrogen and carbon dioxide as raw materials.

[0022] Compared with traditional methods, the above-mentioned methane production equipment system and methane production method utilizing marine energy and resources have the following advantages:

[0023] The aforementioned methane production equipment system and method generate electricity through offshore power generation units, which then supplies power to the electrolytic hydrogen production unit, seawater carbon capture unit, and methane synthesis unit. Electrolytic hydrogen production technology effectively addresses the volatility, intermittency, and intertemporal storage requirements of offshore wind power and other energy sources. Seawater carbon capture technology enables efficient recovery and utilization of carbon dioxide. Combined with carbon dioxide hydrogenation to methane synthesis technology, this effectively solves the hydrogen storage and transportation challenges in offshore wind power hydrogen production, enabling large-scale green methane production and promoting near-zero emissions throughout the energy utilization cycle. By organically combining offshore power generation, offshore hydrogen production, seawater carbon capture, and green methane production, the aforementioned methane production equipment system provides a technological pathway for the high-quality, large-scale development of offshore wind power resources. Attached Figure Description

[0024] Figure 1 is a schematic diagram of a methane production equipment system utilizing marine energy and resources according to an embodiment.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Methane production equipment system; 10. Offshore power generation unit; 11. Wind turbine; 12. AC-DC rectifier; 13. Electrochemical energy storage system; 20. Seawater desalination unit; 21. Seawater pretreatment components; 22. Ultrafiltration and reverse osmosis components; 23. Ultrapure water production components; 30. Electrolytic hydrogen production unit; 31. Power supply components; 32. Pure water storage tank; 33. Alkaline electrolyzer; 34. Proton exchange membrane electrolyzer; 35. First compressor; 36. Hydrogen storage tank; 40. Seawater carbon capture unit; 41. Electrochemical reactor; 42. Second compressor; 43. Carbon dioxide storage tank; 50. Methane synthesis unit; 51. Methane fixed-bed reactor; 52. Methane cooler; 53. Methane separator; 54. Methane storage tank. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] This invention provides a methane production equipment system that utilizes marine energy and resources.

[0033] One embodiment of the methane production equipment system includes an offshore power generation unit 10, an electrolytic hydrogen production unit 30, a seawater carbon capture unit 40, and a methane synthesis unit 50.

[0034] The electrolytic hydrogen production unit 30, the seawater carbon capture unit 40, and the methane synthesis unit 50 are electrically connected to the offshore power generation unit 10. The offshore power generation unit 10 supplies power to the electrolytic hydrogen production unit 30, the seawater carbon capture unit 40, and the methane synthesis unit 50.

[0035] The electrolysis hydrogen production unit 30 produces hydrogen and supplies it to the methane synthesis unit 50.

[0036] The seawater carbon capture unit 40 produces carbon dioxide and supplies it to the methane synthesis unit 50.

[0037] The methane synthesis unit 50 uses hydrogen and carbon dioxide to produce methane.

[0038] The aforementioned methane production equipment system generates electricity through the offshore power generation unit 10, which then supplies power to the electrolytic hydrogen production unit 30, the seawater carbon capture unit 40, and the methane synthesis unit 50. The electrolytic hydrogen production technology effectively addresses the volatility, intermittency, and intertemporal storage requirements of offshore wind power and other forms of electricity. The seawater carbon capture technology enables efficient recovery and utilization of carbon dioxide. Combined with carbon dioxide hydrogenation to methane synthesis technology, this effectively solves the hydrogen storage and transportation challenges in offshore wind power hydrogen production, enabling large-scale production of green methane and promoting near-zero emissions throughout the entire energy utilization cycle. By organically combining offshore power generation, offshore hydrogen production, seawater carbon capture, and green methane production, the aforementioned methane production equipment system provides a technological pathway for the high-quality, large-scale development of offshore wind power resources.

[0039] In some of these examples, the offshore power generation unit 10 includes a wind turbine 11 that generates electricity using offshore wind energy.

[0040] In some of these examples, the offshore power generation unit 10 also includes an AC-DC rectifier 12, one end of which is connected to the wind turbine 11 and the other end to the electrolysis hydrogen production unit 30. The AC-DC rectifier 12 is used to convert the alternating current generated by the wind turbine 11 into direct current, which is then rectified, filtered, and supplied to the electrolysis hydrogen production unit 30.

[0041] In some of these examples, the offshore power generation unit 10 also includes an electrochemical energy storage system 13, which is connected to the wind turbine 11 to store surplus electrical energy.

[0042] The electrolysis hydrogen production unit 30 utilizes fluctuating offshore wind power to electrolyze water and produce hydrogen required for the methane synthesis reaction. The electrolysis hydrogen production unit 30 includes a power supply component 31 connected to an AC-DC rectifier 12 in the offshore power generation unit 10 for distributing wind power load. In some examples, the electrolysis hydrogen production unit 30 includes a pure water storage tank 32, an electrolyzer, a compressor 35, and a hydrogen storage tank 36 connected in sequence.

[0043] In some examples, the electrolyzer includes an alkaline electrolyzer 33 and a proton exchange membrane electrolyzer 34. The alkaline electrolyzer 33 and the proton exchange membrane electrolyzer 34 can be connected sequentially, for example, the alkaline electrolyzer 33 can be positioned between the pure water storage tank 32 and the proton exchange membrane electrolyzer 34. Alternatively, the alkaline electrolyzer 33 and the proton exchange membrane electrolyzer 34 can be arranged in parallel. The power supply component 31 controls the output distribution of the offshore power generation unit 10 according to the capacity configuration of the hydrogen production equipment. Wind power loads with lower volatility are allocated to the alkaline electrolyzer 33 for consumption, ensuring the stability of the load power of the alkaline electrolyzer 33. Wind power loads with higher volatility are allocated to the proton exchange membrane electrolyzer 34 for consumption, leveraging the rapid response characteristics of the proton exchange membrane electrolyzer 34. In this way, the utilization of wind energy and the efficiency of hydrogen production can be maximized.

[0044] The proton exchange membrane electrolyzer 34 has a wider operating power range than the alkaline electrolyzer 33, and its response speed (seconds) is faster (minutes) than that of the alkaline electrolyzer 33. The alkaline electrolyzer 33 and the proton exchange membrane electrolyzer 34 are equipped with wind power loads with different fluctuation characteristics, allowing the wind power output of the hydrogen production equipment to be matched, thus maximizing hydrogen production efficiency. For example, the DC energy consumption for hydrogen production in the alkaline electrolyzer 33 is 4.0–4.3 kWh / Nm³. 3 The current density is 6000–7000 A / m 2 The chamber voltage is 1.8–2.0V, and the hydrogen purity is above 99.7%. The DC energy consumption for hydrogen production in the proton exchange membrane electrolyzer 34 is 3.8–4.0 kWh / Nm³. 3 The current density is 7000–8000 A / m 2 The chamber voltage is 1.8–2.0V, and the hydrogen purity is above 99.9%. Compressor 35 is used to pressurize the hydrogen to the pressure required for the methane synthesis section. Hydrogen storage tank 36 is used for gas charging and discharging, regulating the hydrogen flow rate to meet the production requirements of methane synthesis.

[0045] The aforementioned electrolytic hydrogen production device 30 can effectively solve the coupling problem between the fluctuating power source of offshore wind power and the hydrogen production system, realize flexible hydrogen production, improve the efficiency of wind power consumption, and enhance the overall stability of the system.

[0046] The seawater carbon capture device 40 is used to capture and supply carbon dioxide required for the methane synthesis reaction from seawater. In some examples, the seawater carbon capture device 40 includes an electrochemical reactor 41, a compressor 42, and a carbon dioxide storage tank 43 connected in sequence.

[0047] The electrochemical reactor 41 adjusts the pH of seawater to convert dissolved carbon dioxide into gaseous components, thereby enriching, separating, and capturing carbon dioxide. The carbon dioxide extraction rate of the electrochemical reactor 41 is 80%–90%, and the energy consumption for carbon dioxide capture is 2–4 kWh / Nm³. 3 The carbon dioxide has a purity of over 90%. Compressor 42 is used to pressurize the carbon dioxide to the pressure required for the methane synthesis section. Carbon dioxide storage tank 43 is used for gas charging and discharging, regulating the carbon dioxide flow rate to meet the production requirements of methane synthesis.

[0048] The methane synthesis unit 50 utilizes hydrogen provided by the electrolytic hydrogen production unit 30 and carbon dioxide provided by the seawater carbon capture unit 40 to synthesize methane. In some examples, the methane synthesis unit 50 includes a methane fixed-bed reactor 51, a methane cooler 52, a methane separator 53, and a methane storage tank 54 connected in sequence.

[0049] The methane fixed-bed reactor 51 is connected to a hydrogen storage tank 36 and a carbon dioxide storage tank 43. The hydrogen storage tank 36 provides hydrogen, and the carbon dioxide storage tank 43 provides carbon dioxide. The hydrogen and carbon dioxide are introduced into the methane fixed-bed reactor 51 to synthesize gaseous methane. The gaseous methane is then cooled in a methane cooler 52 to obtain crude methane. The crude methane is purified in a methane separator 53 to obtain refined methane, which is then stored in a methane storage tank 54. Preferably, the catalyst in the methane fixed-bed reactor 51 uses Al2O3 as a support, Ni as a catalyst to improve activity and methane selectivity, and CeO2 as an activator to improve the activity of the catalyst system and methane selectivity. The operating temperature is 350–500℃, the operating pressure is 1–10 MPa, and the volume ratio of hydrogen to carbon dioxide is maintained between 4.2:1 and 4.5:1. After passing through the methane cooler 52 and the methane separator 53, the methane selectivity reaches 90%–96%. In some of these examples, the methane production equipment system also includes a seawater desalination unit 20, an offshore power generation unit 10 that supplies power to the seawater desalination unit 20, and the seawater desalination unit 20 that supplies desalinated water to the electrolysis hydrogen production unit 30.

[0050] In some of these examples, the seawater desalination unit 20 includes a seawater pretreatment unit 21, an ultrafiltration and reverse osmosis unit 22, and an ultrapure water production unit 23 connected in sequence.

[0051] The seawater pretreatment unit 21 removes large particulate impurities such as suspended solids, microorganisms, and organic matter from the seawater. The ultrafiltration and reverse osmosis unit 22 removes dissolved salts and other small molecule impurities from the seawater to produce desalinated water. The ultrapure water unit 23 further removes residual ions, organic matter, bacteria, and other impurities from the desalinated water to obtain ultrapure water. Preferably, to meet the water quality requirements of the electrolytic hydrogen production unit 30, the conductivity of the ultrapure water is controlled to be below 0.1 μS / cm (25°C). In some examples, the ultrapure water unit 23 is connected to the pure water storage tank 32 in the electrolytic hydrogen production unit 30 via a pipeline. The pure water storage tank 32 provides ultrapure water, which is then introduced into the alkaline electrolyzer 33 and the proton exchange membrane electrolyzer 34 for water electrolysis to produce hydrogen.

[0052] Furthermore, the present invention also provides a method for producing methane using a methane production equipment system of any of the above examples.

[0053] One embodiment of a methane production method, utilizing any of the methane production equipment systems described above, includes the following steps:

[0054] The offshore power generation unit 10 supplies power to the electrolytic hydrogen production unit 30, the seawater carbon capture unit 40, and the methane synthesis unit 50.

[0055] Hydrogen is produced using electricity supplied by offshore power generation unit 10 via electrolysis hydrogen production unit 30 and supplied to methane synthesis unit 50.

[0056] The seawater carbon capture device 40 uses the electricity supplied by the offshore power generation device 10 to produce carbon dioxide and supplies carbon dioxide to the methane synthesis device 50.

[0057] Methane is produced using hydrogen supplied by the electrolytic hydrogen production unit 30 and carbon dioxide supplied by the seawater carbon capture unit 40 as raw materials in the methane synthesis unit 50.

[0058] The aforementioned methane production method generates electricity through offshore power generation units, which then supplies power to electrolytic hydrogen production units, seawater carbon capture units, and methane synthesis units. Electrolytic hydrogen production technology effectively addresses the volatility, intermittency, and intertemporal storage requirements of offshore wind power and other energy sources. Seawater carbon capture technology enables efficient recovery and utilization of carbon dioxide. Combined with carbon dioxide hydrogenation to methane synthesis technology, this effectively solves the hydrogen storage and transportation challenges in offshore wind power hydrogen production, enabling large-scale green methane production and promoting near-zero emissions throughout the energy utilization cycle. This methane production equipment system organically combines offshore power generation, offshore hydrogen production, seawater carbon capture, and green methane production, providing a technological pathway for the high-quality, large-scale development of offshore wind power resources.

[0059] In the example of the electrolytic hydrogen production unit 30, which includes a pure water storage tank 32, an electrolyzer, a compressor 35, and a hydrogen storage tank 36 connected in sequence, the power supply component 31 controls the output distribution of the offshore power generation unit 10 according to the capacity configuration of the hydrogen production equipment. Wind power loads with lower volatility are allocated to the alkaline electrolyzer 33 for consumption, ensuring the stability of the load power of the alkaline electrolyzer 33. Wind power loads with higher volatility are allocated to the proton exchange membrane electrolyzer 34 for consumption, leveraging the rapid response characteristics of the proton exchange membrane electrolyzer 34 to maximize wind energy utilization and hydrogen production efficiency. The compressor 35 pressurizes the hydrogen step by step to the pressure required for methane synthesis and sends the hydrogen to the hydrogen storage tank 36 for storage. The hydrogen storage tank 36 regulates the carbon dioxide flow rate entering the methane synthesis reaction tower 51 to meet the production requirements of methane synthesis. Furthermore, the pure water flow rate entering the alkaline electrolyzer 33 and the proton exchange membrane electrolyzer 34 is regulated by the pure water storage tank 32 to meet the production requirements of hydrogen production through water electrolysis.

[0060] In the example where the seawater carbon capture device 40 includes an electrochemical reactor 41, a compressor 42, and a carbon dioxide storage tank 43 connected in sequence, the pH value of the seawater is adjusted by the electrochemical reactor 41, converting carbonates and bicarbonates in the seawater into dissolved carbon dioxide, thus capturing carbon dioxide from the seawater under vacuum conditions. The compressor 32 pressurizes the carbon dioxide step by step to the pressure required for methane synthesis and sends the carbon dioxide to the carbon dioxide storage tank 43 for storage. The carbon dioxide storage tank 43 regulates the flow rate of carbon dioxide entering the methane synthesis reaction tower 51 to meet the production requirements of methane synthesis.

[0061] The methane synthesis unit 50 is coupled with the electrolytic hydrogen production unit 30 to flexibly adjust its operating status according to the output of the offshore power generation unit 10. For example, in an example where the methane synthesis unit 50 includes a methane fixed-bed reactor 51, a methane cooler 52, a methane separator 53, and a methane storage tank 54 connected in sequence, when the output of the offshore power generation unit 10 is high, the electrolytic hydrogen production unit 30 and the methane synthesis unit 50 operate at increased load. In the electrolytic hydrogen production unit 30, the operating power of the alkaline electrolyzer 33 and the proton exchange membrane electrolyzer 34 is distributed through the power supply component 31, and the excess hydrogen produced is stored in the hydrogen storage tank 35. When the output of the offshore power generation unit 10 is low, the electrolytic hydrogen production unit 30 operates at reduced load and releases the hydrogen in the storage tank to maintain the low-load operation of the methane synthesis unit 30.

[0062] In an example where the methane production equipment system also includes a seawater desalination unit 20, an offshore power generation unit 10 supplies power to the seawater desalination unit 20. The offshore power generation unit 10 uses the electricity supplied by the offshore power generation unit 10 to desalinate the seawater, producing desalinated water, which is then supplied to the electrolysis hydrogen production unit 30. The methane synthesis unit 50 also uses the desalinated water supplied by the seawater desalination unit 20 as a raw material to produce methane.

[0063] In the example of a seawater desalination unit 20 comprising a seawater pretreatment unit 21, an ultrafiltration and reverse osmosis unit 22, and an ultrapure water production unit 23 connected in sequence, the seawater pretreatment unit 21 removes large particulate impurities such as suspended solids, microorganisms, and organic matter from the seawater. The ultrafiltration and reverse osmosis unit 22 removes dissolved salts and other small molecule impurities from the seawater to produce desalinated water. The ultrapure water unit 23 further removes residual ions, organic matter, bacteria, and other impurities from the desalinated water to obtain ultrapure water.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A methane production equipment system utilizing marine energy and resources, characterized in that, This includes offshore power generation units, electrolytic hydrogen production units, seawater carbon capture units, and methane synthesis units; The electrolytic hydrogen production unit, the seawater carbon capture unit, and the methane synthesis unit are respectively electrically connected to the offshore power generation unit, and the offshore power generation unit is used to supply power to the electrolytic hydrogen production unit, the seawater carbon capture unit, and the methane synthesis unit; The electrolytic hydrogen production unit is used to produce hydrogen and supply hydrogen to the methane synthesis unit; the seawater carbon capture unit is used to produce carbon dioxide and supply carbon dioxide to the methane synthesis unit; the methane synthesis unit is used to produce methane using the hydrogen and the carbon dioxide.

2. The methane production equipment system as described in claim 1, characterized in that, The offshore power generation unit includes a wind turbine.

3. The methane production equipment system as described in claim 2, characterized in that, The offshore power generation device also includes an AC-DC rectifier. One end of the AC-DC rectifier is connected to the wind turbine, and the other end is connected to the electrolysis hydrogen production device. The AC-DC rectifier is used to convert the alternating current generated by the wind turbine into direct current, and then supply it to the electrolysis hydrogen production device after rectification and filtering. and / or The offshore power generation device also includes an electrochemical energy storage system, which is connected to the wind turbine and is used to store surplus electrical energy.

4. The methane production equipment system as described in claim 1, characterized in that, The electrolytic hydrogen production device includes a pure water storage tank, an electrolyzer, a first compressor, and a hydrogen storage tank connected in sequence.

5. The methane production equipment system as described in claim 4, characterized in that, The electrolytic cell includes an alkaline electrolytic cell and a proton exchange membrane electrolytic cell.

6. The methane production equipment system as described in claim 1, characterized in that, The seawater carbon capture device includes an electrochemical reactor, a second compressor, and a carbon dioxide storage tank connected in sequence.

7. The methane production equipment system as described in claim 1, characterized in that, The methane synthesis unit includes a fixed-bed methane reactor, a methane cooler, a methane separator, and a methane storage tank connected in sequence.

8. The methane production equipment system according to any one of claims 1 to 7, characterized in that, The methane production equipment system also includes a seawater desalination unit, and the offshore power generation unit is also used to supply power to the seawater desalination unit. The seawater desalination unit is used to produce desalinated water and supply desalinated water to the electrolytic hydrogen production unit.

9. The methane production equipment system as described in claim 8, characterized in that, The seawater desalination device includes a seawater pretreatment component, an ultrafiltration and reverse osmosis component, and an ultrapure water production component connected in sequence.

10. A method for producing methane using marine energy and resources, characterized in that, The methane production equipment system according to any one of claims 1 to 9, the methane production method includes the following steps: The offshore power generation unit supplies power to the electrolytic hydrogen production unit, the seawater carbon capture unit, and the methane synthesis unit; Hydrogen is produced using the electrolytic hydrogen production device and supplied to the methane synthesis device; Carbon dioxide is produced using the seawater carbon capture device and supplied to the methane synthesis device; Methane is produced using the methane synthesis apparatus with the hydrogen and carbon dioxide as raw materials.

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