A floating wind power platform off-grid green ammonia system and a preparation process thereof

Abstract

The application discloses a kind of floating wind power platform off-grid green ammonia system and its preparation process, set on floating platform body, including off-grid power supply unit, for providing power for green ammonia system, electrolytic cell unit, for obtaining the hydrogen required for preparation green ammonia, seawater processing unit, for providing raw material for electrolytic cell module, air separation unit, for separating the nitrogen required for preparation green ammonia from air, synthetic ammonia unit, for hydrogen-nitrogen mixed gas reaction synthesis ammonia, electrolytic cell unit includes proton exchange membrane electrolytic cell module and solid oxide electrolytic cell module, by utilizing two kinds of electrolytic water hydrogen production mode and air separation device, the process flow is optimized, the problem of intermittent use of wind power is solved, wind power is abandoned, and the utilization rate of wind power is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore green ammonia preparation, and in particular relates to an off-grid green ammonia production system for a floating wind power platform and a preparation process thereof. Background Art

[0002] Environmental protection and increasing energy demand are driving the development and utilization of renewable energy. 80% of the world's offshore wind energy potential lies in waters deeper than 60 meters. These high-quality wind resources can achieve an annual utilization rate of over 45%. Conventionally, wind energy is converted into electricity by wind turbines, then boosted and transmitted to shore for grid connection. However, deep-sea wind power, due to its distance from the coastline, incurs high costs for submarine cables. Furthermore, the intermittent and time-sensitive nature of wind power generation leads to a mismatch between wind power utilization and actual use, leading to curtailment and further reducing wind power utilization.

[0003] To address this issue, researchers are exploring ways to convert wind power into hydrogen using water electrolysis, which can then be transported to shore. This process, which emits no CO2, is considered a promising future for offshore wind power. However, hydrogen's low volumetric energy density and high transportation costs have hindered the development of wind power hydrogen production. To address this issue, researchers are synthesizing ammonia from hydrogen and nitrogen in the air, which can then be transported. This solves the high cost of hydrogen transportation, and ammonia is also a widely used chemical raw material and emerging fuel.

[0004] There is a compatibility problem between traditional ammonia synthesis technology and hydrogen production by electrolysis of water and intermittent wind power. After searching, it was found that the Chinese patent with application number CN202110729287.1 discloses a renewable energy ammonia synthesis system with combined cooling, heat and power. In the raw gas purification section, pressure swing adsorption is used, and hydrogen catalytic oxidation catalyst and water adsorbent are simultaneously loaded in the adsorption column, which simplifies the raw gas purification process; in the ammonia separation section, temperature swing adsorption combined with double cooling is used to greatly reduce the power consumption of the ammonia separation process. Although this system saves energy, it still partially uses the power grid as production energy, which does not meet the conditions for green offshore ammonia production, and the by-product energy is not fully utilized, wasting a lot of resources. Summary of the Invention

[0005] To solve the above problems, the present invention provides a floating wind power platform off-grid green ammonia production system and its preparation process. By utilizing two water electrolysis hydrogen production methods and an air separation device, the process flow is optimized, the problem of intermittent utilization of wind power is solved, the abandonment of wind and electricity is eliminated, and the utilization rate of wind power is improved.

[0006] The technical solutions provided by the present invention are as follows:

[0007] The first part is a floating wind power off-grid green ammonia production system, which is installed on the floating platform body and includes an off-grid power supply unit for providing power to the green ammonia production system;

[0008] Electrolyzer unit, used to obtain hydrogen required for the production of green ammonia;

[0009] a seawater treatment unit to provide feedstock for the electrolyzer modules;

[0010] Air separation unit, used to separate nitrogen required for the preparation of green ammonia from air;

[0011] Ammonia synthesis unit, used to synthesize ammonia by reacting hydrogen and nitrogen mixed gas;

[0012] The electrolyzer unit includes a proton exchange membrane electrolyzer module and a solid oxide electrolyzer module. The seawater treatment unit includes a seawater reverse osmosis desalination and deionization module and a seawater evaporation desalination module. The seawater reverse osmosis desalination and deionization module provides deionized water for the proton exchange membrane electrolyzer module, and the seawater evaporation desalination module provides water vapor for the solid oxide electrolyzer module.

[0013] In the above system, preferably, a plurality of proton exchange membrane electrolyzer modules and a plurality of solid oxide electrolyzer modules are provided.

[0014] In the above system, preferably, the air separation unit includes an air separation nitrogen production module, which uses the pressure swing adsorption principle to separate nitrogen from the air as one of the raw materials for synthesizing ammonia.

[0015] In the above system, preferably, the ammonia synthesis unit includes an ammonia synthesis reaction module, and a mixed gas boosting module is provided at the front end of the ammonia synthesis reaction module for boosting the hydrogen-nitrogen mixed gas. The circulating gas formed after the reaction in the ammonia synthesis reaction module passes through the seawater evaporation desalination module to provide thermal energy for it.

[0016] In the above system, preferably, a circulating gas condensation and separation module is provided at the rear end of the ammonia synthesis reaction module for liquefying and separating the ammonia gas, and the remaining circulating gas passes through the circulating gas boosting module and returns to the ammonia synthesis reaction module.

[0017] In the above system, preferably, the circulating gas condensation and separation module is provided with a venting device.

[0018] The second part is a preparation process of green ammonia produced by floating wind power off-grid, which is applicable to the above-mentioned floating wind power off-grid green ammonia production system, including the following steps:

[0019] S1: Part of the seawater enters the seawater reverse osmosis desalination module to form deionized water, and then enters the proton exchange membrane electrolyzer module to produce hydrogen;

[0020] S2: Another part of the seawater enters the seawater evaporation desalination module, and the heat energy generated by the ammonia synthesis reaction module is converted into water vapor, which enters the solid oxide electrolyzer module to produce hydrogen;

[0021] S3: The air enters the air separation and nitrogen production module to separate nitrogen, which is then mixed with the hydrogen produced in steps S and S, and then pressurized by the mixed gas booster module before entering the ammonia synthesis reaction module to produce ammonia.

[0022] S4: The high-temperature ammonia produced by the ammonia synthesis reaction module and the unreacted hydrogen and nitrogen are cooled by heating seawater and then enter the circulating gas condensation and separation module to liquefy and separate the ammonia. The remaining circulating gas passes through the circulating gas boosting module and returns to the ammonia synthesis reaction module to continue synthesizing ammonia.

[0023] S5: When the power provided by the off-grid power supply unit is insufficient, the synthetic ammonia reaction module needs to be operated at a reduced load. At this time, some proton exchange membrane electrolyzer modules are first shut down. When the load becomes smaller and smaller until all proton exchange membrane electrolyzer modules are shut down, the load of the solid oxide electrolyzer module begins to be reduced.

[0024] In the above preparation process, preferably, the mass ratio of the hydrogen provided in the proton exchange membrane electrolyzer module to the hydrogen provided in the solid oxide electrolyzer module is 9:1.

[0025] The third part is a floating wind power platform used to carry the above-mentioned floating wind power off-grid green ammonia production system, including a floating platform body, on which a centralized control room, a machine pump room, a flare arm and a liquid ammonia storage tank are provided. The flare arm is arranged at the bow of the floating platform body, and the liquid ammonia storage tank is connected to the liquid outlet of the circulating gas condensation separation module for storing finished liquid ammonia.

[0026] Preferably, the floating platform body is also provided with an ammonia export module, which is connected to the liquid ammonia storage tank for the transfer of liquid ammonia. The floating platform body is also provided with a backup power supply and a debugging power supply, which use the ammonia in the liquid ammonia storage tank as fuel to generate electricity.

[0027] In summary, the beneficial effects of the present invention are:

[0028] (1) The present invention optimizes the process flow by utilizing two water electrolysis hydrogen production methods and an air separation device. Through the flexible operation of the proton exchange membrane electrolyzer and the solid oxide electrolyzer, the problem of intermittent utilization of wind power is solved, the abandonment of wind power is eliminated, and the utilization rate of wind power is improved. At the same time, the solid oxide electrolyzer can use the heat of the circulating gas to supply water vapor, forming a thermal cycle and reducing energy consumption. With the improvement of the commercialization of deep-sea wind farms and proton exchange membrane electrolyzers and solid oxide electrolyzers, this device will have certain economic performance and has good prospects.

[0029] (2) The present invention is provided with a backup power supply and a debugging power supply, and uses the product ammonia as fuel to generate electricity, thereby solving the problems of backup power supply and initial debugging of the project. At the same time, it maintains the entire synthetic ammonia process in a hot standby state when the wind farm cannot output electricity, thereby ensuring the continuity of subsequent processes.

[0030] (3) The raw materials of the present invention are water and air, the electric energy is wind power generation, the discharge volume is less than the traditional natural gas reforming to synthesize ammonia, and the entire device production process does not emit CO2, which meets the requirements of green ammonia production. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a process flow chart for synthesizing ammonia according to the present invention;

[0032] Figure 2 Schematic diagram of the top view of the floating wind power platform of the present invention;

[0033] Figure 3 It is a side structural schematic diagram of the floating wind power platform of the present invention.

[0034] The reference numerals are as follows:

[0035] 1. Floating platform body; 2. Centralized control room; 3. Engine and pump room; 4. Flare arm; 5. Liquid ammonia storage tank; 6. Air separation and nitrogen production module; 7. Seawater reverse osmosis desalination and deionization module; 8. Ammonia export module; 9. Proton exchange membrane electrolyzer module; 10. Solid oxide electrolyzer module; 11. Circulating gas condensation and separation module; 12. Circulating gas boosting module; 13. Seawater evaporation desalination module; 14. Ammonia synthesis reaction module; 15. Mixed gas boosting module. DETAILED DESCRIPTION

[0036] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the examples. The following examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0037] like Figure 1 、 Figure 2 As shown, a floating wind power off-grid green ammonia production system is arranged on a floating platform body 1, comprising an off-grid power supply unit, an electrolyzer unit, a seawater treatment unit, an air separation unit, and an ammonia synthesis unit. The off-grid power supply unit is used to provide power to the green ammonia production system, the electrolyzer unit is used to obtain hydrogen required for green ammonia production, the seawater treatment unit is used to provide raw materials for the electrolyzer module, the air separation unit is used to separate nitrogen required for green ammonia production from air, and the ammonia synthesis unit is used to synthesize ammonia by reacting a hydrogen and nitrogen mixture.

[0038] In order to solve the problem of intermittent utilization of wind power, two hydrogen preparation methods are configured. The electrolyzer unit includes a proton exchange membrane electrolyzer module 9 and a solid oxide electrolyzer module 10. The seawater treatment unit includes a seawater reverse osmosis desalination and deionization module 7 and a seawater evaporation desalination module 13. The seawater reverse osmosis desalination and deionization module 7 provides deionized water for the proton exchange membrane electrolyzer module 9, and the seawater evaporation desalination module 13 provides water vapor for the solid oxide electrolyzer module 10.

[0039] The annual production of synthetic ammonia is based on factors such as the annual power generation of the wind farm and the annual average utilization coefficient. Depending on the size of the wind farm, one or more such floating wind power off-grid green ammonia production systems can be configured for operation. The specific configuration method is common knowledge among those skilled in the art and will not be repeated in this application.

[0040] Specifically, in this embodiment, the off-grid power supply unit is wind power, and the electricity generated by the wind farm is used as the main energy source to drive the platform. The process of producing green ammonia does not emit CO2, so the ammonia product produced is green. Furthermore, the off-grid power supply unit can also be connected to a backup power supply and a debugging power supply. The backup power supply and the debugging power supply use the ammonia in the liquid ammonia storage tank as fuel to generate electricity. Both the backup power supply and the debugging power supply adopt a redundant design and adopt an N+1 mode.

[0041] After the seawater from the ocean is lifted onto the floating body, part of it enters the seawater reverse osmosis desalination deionization module 7 for treatment. The deionized water produced must at least meet GB / T37562-2019 (corresponding to ISO 3696GRADE 2 or ASTMD1193-92 TYPE II), that is, the conductivity is not greater than 1μs / cm. The deionized water that meets the above requirements enters the proton exchange membrane electrolyzer module 9 for hydrogen production; the other part of the seawater enters the seawater evaporation desalination module 13, and the steam produced by heating enters the solid oxide electrolyzer module 10 for hydrogen production. The hydrogen produced by the proton exchange membrane electrolyzer module 9 and the solid oxide electrolyzer module 10 together provide hydrogen raw materials for synthetic ammonia.

[0042] In a preferred embodiment, a plurality of proton exchange membrane electrolyzer modules 9 and a plurality of solid oxide electrolyzer modules 10 are provided.

[0043] Specifically, the proton exchange membrane electrolyzer module 9 and the solid oxide electrolyzer module 10 are both configured as multiple electrolyzers connected in parallel, which allows the system to adapt to the instability of renewable energy and increase the flexibility of variable operating conditions.

[0044] Each proton exchange membrane electrolyzer module 9 and solid oxide electrolyzer module 10 can be designed as a container, which is convenient for lifting and immediate replacement after dismantling, thereby improving the reliability of system operation.

[0045] As another embodiment for further optimization, the air separation unit is an air separation nitrogen production module 6. The air separation nitrogen production module 6 adopts a PSA air separation device and uses the pressure swing adsorption principle to separate nitrogen from the air as one of the raw materials for synthesizing ammonia. The air separation module technology is an existing technology, and its function is to separate its components from the air using the low-temperature freezing principle. It will not be described in detail in this application. It is applied to the green ammonia production system of this application. The effective component separated is nitrogen, and the remaining components can be recycled.

[0046] The ammonia synthesis unit includes an ammonia synthesis reaction module 14. A mixed gas boosting module 15 is provided at the front end of the ammonia synthesis reaction module 14 for boosting the pressure of the hydrogen-nitrogen mixed gas. The circulating gas formed after the reaction in the ammonia synthesis reaction module 14 passes through the seawater evaporation desalination module 13 to provide heat energy for it.

[0047] Specifically, hydrogen and nitrogen are mixed in a specific ratio and enter the mixed gas booster module 15. After being boosted, they enter the ammonia synthesis reaction module 14. Under a certain pressure and temperature, the hydrogen and nitrogen are synthesized to form ammonia. The high-temperature ammonia and unreacted hydrogen and nitrogen are called recycle gas. The recycle gas enters the seawater evaporative desalination module 13 to heat the seawater. The ammonia synthesis unit is also equipped with a safety fire protection system and a pollution prevention system. The safety fire protection system meets SOLAS requirements, and the pollution prevention system meets MAPROL requirements.

[0048] A circulating gas condensation and separation module 11 is provided at the rear end of the ammonia synthesis reaction module 14 for liquefying and separating the ammonia gas. The remaining circulating gas passes through the circulating gas pressurizing module 12 and returns to the ammonia synthesis reaction module 14 .

[0049] Furthermore, the circulating gas condensation and separation module 11 is provided with a venting device. Compared with the natural gas reforming process, the circulating gas is relatively clean and contains less impurities such as argon and water vapor, so the emission here is very small and has little impact on the environment.

[0050] This system will also produce pure oxygen and other substances as by-products, and this application will provide corresponding equipment to collect them.

[0051] A process for producing green ammonia using a floating wind power off-grid method is provided, which is applicable to the above-mentioned floating wind power off-grid system for producing green ammonia. The process uses seawater and air as raw materials and wind power generation as the main power source, thereby achieving green ammonia production. The process comprises the following steps:

[0052] S1: Part of the seawater enters the seawater reverse osmosis desalination module 7 to form deionized water, and then enters the proton exchange membrane electrolyzer module 9 to produce hydrogen;

[0053] Seawater from the ocean enters the seawater reverse osmosis desalination deionization module 7 for desalination, and is further deionized after desalination. The deionized water enters the proton exchange membrane electrolyzer module 9 to produce hydrogen.

[0054] S2: Another part of the seawater enters the seawater evaporation desalination module 13, and is converted into water vapor by the heat energy generated by the ammonia synthesis reaction module 14 and enters the solid oxide electrolyzer module 10 to produce hydrogen;

[0055] The solid oxide electrolyzer module 10 needs water vapor to produce hydrogen, and the water vapor is provided by the seawater evaporation desalination module 13. The heat required by the seawater evaporation desalination module 13 comes from the synthetic ammonia circulating gas.

[0056] S3: The air enters the air separation and nitrogen production module 6 to separate nitrogen, which is then mixed with the hydrogen produced in steps S1 and S2, and then pressurized by the mixed gas boosting module 15, and then enters the ammonia synthesis reaction module 14 to produce ammonia;

[0057] Specifically, the nitrogen and hydrogen are mixed in a ratio of 1:3 and then enter the mixed gas boosting module 15 with a boosting pressure greater than 200 bar.

[0058] The mixed gas is heated to a high temperature in the ammonia synthesis reaction module 14. The synthesis tower in the ammonia synthesis reaction module 14 generally uses an iron-based catalyst. The heating temperature is generally 380-500°C. The heat source used for heating is provided by wind power and is connected to a backup power supply.

[0059] The mixed gas (nitrogen to hydrogen molar ratio of 1:3) is synthesized into ammonia in the synthesis tower of the ammonia synthesis reaction module 14. According to production experience, only about 20% of the hydrogen is synthesized into ammonia.

[0060] The high-temperature ammonia generated by the reaction and the incompletely reacted hydrogen and nitrogen are called circulating gas.

[0061] S4: The high-temperature ammonia gas produced by the ammonia synthesis reaction module 14 and the unreacted hydrogen and nitrogen are cooled by heating seawater and then enter the circulating gas condensation and separation module 11 to liquefy and separate the ammonia gas. The remaining circulating gas passes through the circulating gas boosting module 12 and returns to the ammonia synthesis reaction module 14 to continue synthesizing ammonia.

[0062] The circulating gas enters the seawater evaporation desalination module 13. After the circulating gas temperature drops to a point where seawater evaporation is no longer possible, it leaves the seawater evaporation desalination module 13 and enters the circulating gas condensation and separation module 11, where ammonia in the circulating gas is condensed into liquid and then separated. The remaining hydrogen and nitrogen mixed circulating gas enters the circulating gas boosting module 12, and after boosting, it enters the ammonia synthesis reaction module 14 again and enters the ammonia synthesis process again.

[0063] Specifically, the high temperature of the circulating gas is utilized and the principle of pressure reduction and heating is adopted to distill seawater to obtain water vapor with a temperature of 120-150° C., which is used as the feed gas for the solid oxide electrolyzer module 10 .

[0064] The circulating gas with reduced temperature enters the circulating gas condensation separation module 11, where the temperature of the circulating gas is reduced to -20-20°C (depending on the pressure during ammonia liquefaction), and the ammonia is liquefied and separated.

[0065] The remaining recycle gas enters the recycle gas pressurizing module 12 and is pressurized to above 200 bar before entering the ammonia synthesis reaction module 14 to continue circulating and synthesizing ammonia.

[0066] S5: When the power provided by the off-grid power supply unit is insufficient, the synthetic ammonia reaction module 14 needs to be operated at a reduced load. At this time, some proton exchange membrane electrolyzer modules 9 are first shut down. When the load becomes smaller and smaller until all proton exchange membrane electrolyzer modules 9 are shut down, the load of the solid oxide electrolyzer module 10 begins to be reduced.

[0067] Specifically, since the hydrogen production temperature requirement of the proton exchange membrane electrolyzer module 9 is low, usually 60-100°C, and maintenance is relatively simple, it is first selected to shut down some proton exchange membrane electrolyzer modules 9, and shut down or reduce the proton exchange membrane electrolyzer modules 9 and solid oxide electrolyzer modules 10 that meet the requirements to always be in hot standby state.

[0068] When the output power of the wind farm is less than a certain proportion, the proton exchange membrane electrolyzer 9 is shut down to produce hydrogen, and the solid oxide electrolyzer 10 and the ammonia synthesis reaction module 14 are put into hot standby state.

[0069] When the wind farm is unable to output power, a backup power source is needed to maintain the entire ammonia synthesis process in hot standby mode. The power required during this period is approximately 8-10% of the system's maximum operating energy consumption. When the external wind speed reaches the turbine cut-in speed of 3-4 m / s, the wind farm can resume output, allowing the hot standby ammonia synthesis process to be quickly started.

[0070] Furthermore, the mass ratio of the hydrogen provided by the proton exchange membrane electrolyzer module 9 to the hydrogen provided by the solid oxide electrolyzer module 10 is 9:1.

[0071] Specifically, in most cases, based on the heat carried by the circulating gas after the ammonia synthesis reaction, the water vapor provided after evaporating seawater can make the ratio of the amount of hydrogen generated by the solid oxide electrolyzer module 10 to the amount of hydrogen required for ammonia synthesis be about 10%, and the remaining 90% needs to be provided by the proton exchange membrane electrolyzer module 9.

[0072] A floating wind power platform is used to carry the above-mentioned floating wind power off-grid green ammonia production system, including a floating platform body 1. The floating platform body 1 is provided with a centralized control room 2, a machine pump room 3, a torch arm 4 and a liquid ammonia storage tank 5. The torch arm 4 is arranged at the bow of the floating platform body 1. The liquid ammonia storage tank 5 is connected to the liquid outlet of the circulating gas condensation separation module 11 and is used to store finished liquid ammonia.

[0073] Specifically, the floating platform body 1 adopts a barge-type floating structure, and the bow and stern of the ship adopt a streamlined design. The specific layout is designed according to the wind, wave, current and sea conditions of the installation area. This is common knowledge among those skilled in the art.

[0074] The floating platform body 1 can be fixed by a distributed mooring system or a single-point mooring system. The floating platform body 1 is also provided with a ballast system for adjusting the buoyancy of the floating platform.

[0075] Centralized control room 2, located at the rear of the floating platform 1, is used for centralized measurement, monitoring, alarming, and control of the entire facility. It also houses living quarters and a maintenance area to ensure routine maintenance and repair of the entire ammonia production process. Maintenance and repair procedures include at least one spare parts crane, a spare parts hoisting platform, and a maintenance room. Spare parts are hoisted from the exterior of the floating platform 1 onto the main deck. General maintenance is performed in the maintenance room within the floating platform's maintenance area. If specialized personnel and tools are required, they are hoisted onto a transport vehicle using a crane and taken to a designated location for repair.

[0076] The engine and pump room 3 is equipped with a generator set, a nitrogen generator, a compressed air and instrument gas generator, etc., as well as necessary pumps and related systems such as ballast, fire protection and bilge. The generator set serves as the backup power supply and debugging power supply, adopts a redundant design, and uses ammonia as fuel.

[0077] The flare arm 4 is arranged at the bow of the floating platform body 1. The flare arm is provided with a permanent lamp for burning the emissions emitted during the process.

[0078] Furthermore, the floating platform body 1 is also provided with an ammonia export module 8, which is connected to the liquid ammonia storage tank 5 for the transfer of liquid ammonia. The floating platform body 1 is also provided with a backup power supply and a debugging power supply. The backup power supply and the debugging power supply use the ammonia in the liquid ammonia storage tank 5 as fuel to generate electricity.

[0079] The generated product ammonia is in liquid form and is stored in the liquid ammonia storage tank 5 of the floating platform body 1. The liquid ammonia storage tank 5 can be provided with several Figure 35a, 5b, 5c, 5d, the liquid ammonia is transferred to the ammonia export module 8 through the pump installed in the liquid ammonia storage tank 5. The ammonia export module 8 has a metering function. The exported liquid ammonia is measured and then transferred to the liquid ammonia transport ship docked next to the floating platform body 1 for transportation.

[0080] In other embodiments, the floating platform body 1 may also serve as a fuel supply station for merchant ships that use ammonia as fuel.

[0081] Specifically, the ammonia export module 8 is mainly used to export the liquid ammonia storage tank 5 to the outside, but it also has the function of transferring ammonia from the outside to the liquid ammonia storage tank 5. This ensures that during commissioning and when the wind farm has no power output, if the amount of liquid ammonia stored in the liquid ammonia storage tank 5 is insufficient, there is sufficient ammonia from the outside to maintain hot standby of the entire synthetic ammonia system.

[0082] It should be noted that the implementation methods not shown or described in the drawings or the main text of the specification are all forms known to ordinary technicians in the relevant technical field and are not described in detail. In addition, the above definitions of each element and method are not limited to the various specific structures, shapes or methods mentioned in the embodiments.

[0083] It should also be noted that the directional terms mentioned in the embodiments, such as "up", "down", "front", "back", "left", "right", "inside", "outside", etc., are only for reference to the directions of the drawings and are not intended to limit the scope of protection of this application.

[0084] The foregoing description shows and describes preferred embodiments of the present invention. As previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the inventive concept described herein by the teachings above or by techniques or knowledge in the relevant art. Modifications and variations made by those skilled in the art without departing from the spirit and scope of the present invention are intended to be within the scope of the appended claims.

Claims

1. A floating wind power off-grid green ammonia production system, arranged on a floating platform body (1), characterized in that: Includes an off-grid power supply unit for providing power to the green ammonia production system; Electrolyzer unit, used to obtain hydrogen required for the production of green ammonia; a seawater treatment unit for providing raw materials for the electrolyzer module; Air separation unit, used to separate nitrogen required for the preparation of green ammonia from air; Ammonia synthesis unit, used to synthesize ammonia by reacting hydrogen and nitrogen mixed gas; The electrolyzer unit comprises a proton exchange membrane electrolyzer module (9) and a solid oxide electrolyzer module (10); the seawater treatment unit comprises a seawater reverse osmosis desalination and deionization module (7) and a seawater evaporation desalination module (13); the seawater reverse osmosis desalination and deionization module (7) provides deionized water for the proton exchange membrane electrolyzer module (9), and the seawater evaporation desalination module (13) provides water vapor for the solid oxide electrolyzer module (10); The proton exchange membrane electrolyzer modules (9) and the solid oxide electrolyzer modules (10) are both provided in plurality; The proton exchange membrane electrolyzer module (9) and the solid oxide electrolyzer module (10) are both configured as multiple electrolyzers connected in parallel; The mass ratio of the hydrogen provided in the proton exchange membrane electrolyzer module (9) to the hydrogen provided in the solid oxide electrolyzer module (10) is 9:

1.

2. The floating wind power off-grid green ammonia production system according to claim 1, characterized in that: The air separation unit comprises an air separation nitrogen production module (6), which uses the pressure swing adsorption principle to separate nitrogen from the air as one of the raw materials for synthesizing ammonia.

3. The floating wind power off-grid green ammonia production system according to claim 1, characterized in that: The synthetic ammonia unit comprises an synthetic ammonia reaction module (14), and a mixed gas pressurizing module (15) is provided at the front end of the synthetic ammonia reaction module (14) for pressurizing the hydrogen-nitrogen mixed gas. The circulating gas formed after the reaction in the synthetic ammonia reaction module (14) passes through the seawater evaporation desalination module (13) to provide thermal energy therefor.

4. The floating wind power off-grid green ammonia production system according to claim 3, characterized in that: A circulating gas condensation and separation module (11) is provided at the rear end of the ammonia synthesis reaction module (14) for liquefying and separating the ammonia gas, and the remaining circulating gas passes through the circulating gas boosting module (12) and returns to the ammonia synthesis reaction module (14).

5. The floating wind power off-grid green ammonia production system according to claim 4, characterized in that: The circulating gas condensation and separation module (11) is provided with a venting device.

6. A process for preparing green ammonia by floating wind power off-grid, applicable to the system for preparing green ammonia by floating wind power off-grid according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Part of the seawater enters the seawater reverse osmosis desalination module (7) to form deionized water, and then enters the proton exchange membrane electrolyzer module (9) to produce hydrogen; S2: Another part of the seawater enters the seawater evaporation desalination module (13), and is converted into water vapor by the heat energy generated by the ammonia synthesis reaction module (14) and enters the solid oxide electrolyzer module (10) to produce hydrogen; S3: The air enters the air separation and nitrogen production module (6) to separate the nitrogen, which is then mixed with the hydrogen produced in steps S1 and S2, and then pressurized by the mixed gas boosting module (15), and then enters the ammonia synthesis reaction module (14) to produce ammonia; S4: The high-temperature ammonia gas and the unreacted hydrogen and nitrogen gas produced by the ammonia synthesis reaction module (14) are cooled by heating seawater and then enter the circulating gas condensation and separation module (11) to liquefy and separate the ammonia gas. The remaining circulating gas passes through the circulating gas boosting module (12) and returns to the ammonia synthesis reaction module (14) to continue synthesizing ammonia. S5: When the power provided by the off-grid power supply unit is insufficient, the synthetic ammonia reaction module (14) needs to be operated at a reduced load. At this time, some of the proton exchange membrane electrolyzer modules (9) are first shut down. When the load becomes smaller and smaller until all the proton exchange membrane electrolyzer modules (9) are shut down, the load of the solid oxide electrolyzer module (10) begins to be reduced.

7. The process for preparing green ammonia using floating wind power off-grid according to claim 6, characterized in that: The mass ratio of the hydrogen provided in the proton exchange membrane electrolyzer module (9) to the hydrogen provided in the solid oxide electrolyzer module (10) is 9:

1.

8. A floating wind power platform for carrying the floating wind power off-grid green ammonia production system according to any one of claims 1 to 5, characterized in that: The floating platform body (1) comprises a central control room (2), a pump room (3), a flare arm (4) and a liquid ammonia storage tank (5), the flare arm (4) being arranged at the bow of the floating platform body (1), and the liquid ammonia storage tank (5) being connected to the liquid outlet of the circulating gas condensation separation module (11) for storing finished liquid ammonia.

9. The floating wind power platform according to claim 8, characterized in that: The floating platform body (1) is further provided with an ammonia export module (8), which is connected to the liquid ammonia storage tank (5) for the transfer of liquid ammonia. The floating platform body (1) is further provided with a backup power supply and a debugging power supply, which utilize the ammonia in the liquid ammonia storage tank (5) as fuel to generate electricity.

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