Offshore wind power hydrogen production-ammonia-alcohol multi-union system and method

Abstract

The invention belongs to the technical field of comprehensive utilization of green energy, and discloses an offshore wind power hydrogen production-ammonia-alcohol multi-union system and method. A water electrolysis hydrogen production module of the offshore wind power hydrogen production-ammonia-alcohol multi-connected system is used for electrolyzing water into hydrogen by using offshore wind power, and the prepared hydrogen is stored in a hydrogen buffer tank; the methanol synthesis module is communicated with the hydrogen buffer tank and is used for synthesizing high-temperature methanol steam; the ammonia synthesis module is communicated with the hydrogen buffer tank and is used for synthesizing ammonia; the methanol steam heat pump module comprises a first evaporator, a first compressor and a first condenser which are connected with one another and form circulation, the first evaporator is in heat exchange connection with high-temperature methanol steam, and the first condenser is in heat exchange connection with electrolyte of the water electrolysis hydrogen production module. According to the offshore wind power hydrogen production-ammonia-alcohol multi-union system, all the modules can operate cooperatively, safe and stable production of all the modules is guaranteed, the electrolytic hydrogen production efficiency is further improved, and the purposes of energy conservation and emission reduction can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of comprehensive utilization of green energy, and in particular to an offshore wind power hydrogen production-ammonia-alcohol multi-connection system and method. Background Art

[0002] Hydrogen production from renewable energy is an important path to achieving the carbon peak target and realizing the carbon neutrality vision. Using renewable energy to electrolyze water to produce "green hydrogen" and further synthesize chemical products such as ammonia and alcohol is an important technical direction to promote the further development of new energy and achieve deep decarbonization of the power and chemical industries. It involves in-depth intersections of multiple disciplines such as power and chemical industry, and is an important technical research direction in the future. Its main processes include wind and solar power generation, green hydrogen preparation, green ammonia synthesis, methanol synthesis, etc.

[0003] Hydrogen production from offshore wind power is an important part of hydrogen production from renewable energy. In recent years, with the gradual expansion of offshore wind power installed capacity, hydrogen production from offshore wind power and the production of other chemical products have become a focus of future industrial development, with huge market potential and broad development prospects. Although the current technology for hydrogen production from water electrolysis has entered the stage of market-oriented development, hydrogen production still faces problems such as high energy consumption, high cost, inflexible operation and control of the electrolyzer, long electrolyzer startup time, and low efficiency. In addition, offshore hydrogen production is easily corroded by electrolyzer equipment because of the humid environment of seawater, which poses a challenge to the operating life of the equipment. At the same time, because hydrogen is difficult to store, converting the produced hydrogen into other products without explosion hazard is a convenient way to solve the problem of hydrogen storage.

[0004] Therefore, there is an urgent need to provide a new offshore wind power hydrogen production-ammonia-alcohol multi-connected system and method to solve the above-mentioned technical problems in the prior art. Summary of the invention

[0005] One object of the present invention is to provide an offshore wind power hydrogen production-ammonia-alcohol multi-connected system, which can enable the various modules on the system to operate in coordination, ensure the safe and stable production of each module, and also improve the efficiency of hydrogen production by electrolysis, so as to achieve the purpose of energy conservation and emission reduction.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The offshore wind power hydrogen production-ammonia-alcohol multi-connected system includes a water electrolysis hydrogen production module, a methanol synthesis module, an ammonia synthesis module, a methanol steam heat pump module and a seawater heat pump module. The water electrolysis hydrogen production module is used to use offshore wind power to electrolyze water to generate hydrogen, and the generated hydrogen is stored in a hydrogen buffer tank; the methanol synthesis module is connected to the hydrogen buffer tank, and the methanol synthesis module is used to synthesize high-temperature methanol steam; the ammonia synthesis module is connected to the hydrogen buffer tank, and the ammonia synthesis module is used to synthesize ammonia; the methanol steam heat pump module includes a first evaporator, a first compressor and a first condenser that are interconnected and form a cycle, the first evaporator is connected to the high-temperature methanol steam for heat exchange, and the first condenser is connected to the electrolyte of the water electrolysis hydrogen production module for heat exchange; the seawater heat pump module includes a second evaporator, a second compressor and a second condenser that are interconnected and form a cycle, and the second condenser is connected to the electrolyte of the water electrolysis hydrogen production module for heat exchange.

[0008] Optionally, the water electrolysis hydrogen production module comprises an electrolytic cell and an alkali liquid tank which are interconnected, the alkali liquid tank is used to store electrolyte and inject the electrolyte into the electrolytic cell, the electrolytic cell is connected to the hydrogen buffer tank, and the alkali liquid tank is connected to the first condenser for heat exchange.

[0009] Optionally, the second evaporator is connected to the seawater circulation pipeline for heat exchange, and the second condenser is connected to the alkali liquid tank for heat exchange.

[0010] Optionally, the alkali liquid tank is connected to the second condenser via a first liquid inlet pipe and a first liquid return pipe, the alkali liquid tank is connected to the electrolytic cell via a second liquid inlet pipe and a second liquid return pipe, the first liquid inlet pipe is also connected to the second liquid inlet pipe via a first branch pipe, and the second liquid return pipe is also connected to the first liquid return pipe via a second branch pipe.

[0011] Optionally, one end of the second liquid return pipe close to the alkali liquid tank, one end of the second liquid inlet pipe close to the alkali liquid tank, the first branch pipe and the second branch pipe are all provided with stop valves, so that the alkali liquid tank, the second liquid return pipe, the electrolytic cell and the second liquid inlet pipe are connected in sequence to form a first circulation, and the first liquid inlet pipe, the first branch pipe, the electrolytic cell, the second liquid return pipe, the second branch pipe and the first liquid return pipe form a second circulation.

[0012] Optionally, the offshore wind power hydrogen production-ammonia-alcohol multi-connected system also includes a control module and a power module, the control module is electrically connected to the power module, the power module is electrically connected to the offshore wind turbine, and the control module is electrically connected to the water electrolysis hydrogen production module, the methanol synthesis module, the ammonia synthesis module, the methanol steam heat pump module and the seawater heat pump module.

[0013] Optionally, the offshore wind power hydrogen production-ammonia-alcohol multi-unit system also includes a supporting platform, which includes a central part and three supporting parts surrounding the central part, the control module and the power module are both arranged in the central part, and the three supporting parts are respectively and correspondingly provided with the water electrolysis hydrogen production module, the methanol synthesis module and the ammonia synthesis module.

[0014] Optionally, a photovoltaic panel is further provided on the outer wall of the support platform, and the photovoltaic panel is electrically connected to the power module.

[0015] Optionally, the water electrolysis hydrogen production module is housed in a nitrogen filling module, the nitrogen filling module is connected to a nitrogen buffer tank, and the nitrogen buffer tank is connected to the ammonia synthesis module.

[0016] Another object of the present invention is to provide an offshore wind power hydrogen production-ammonia-alcohol method, which is used to control an offshore wind power hydrogen production-ammonia-alcohol multi-connected system as described in any of the above schemes, and includes the following steps: S1, an offshore wind turbine and a photovoltaic panel generate electricity to supply power to the above-mentioned water electrolysis hydrogen production module, and the hydrogen produced by the above-mentioned water electrolysis hydrogen production module is stored in a hydrogen buffer tank; S2, the above-mentioned methanol synthesis module uses the hydrogen in the above-mentioned hydrogen buffer tank to synthesize high-temperature methanol steam; S3, the above-mentioned methanol steam heat pump module uses the heat of the above-mentioned high-temperature methanol steam to heat the electrolyte of the above-mentioned water electrolysis hydrogen production module; S4, the above-mentioned ammonia synthesis module uses the hydrogen in the above-mentioned hydrogen buffer tank to synthesize ammonia.

[0017] Beneficial effects:

[0018] The offshore wind power hydrogen production-ammonia-alcohol multi-connected system of the present invention comprises a water electrolysis hydrogen production module, a methanol synthesis module, an ammonia synthesis module and a methanol steam heat pump module. The hydrogen produced by the water electrolysis hydrogen production module is stored in a hydrogen buffer tank, and then the hydrogen is supplied to the methanol synthesis module and the ammonia synthesis module to synthesize the hydrogen into the required ammonia and methanol. In this process, the methanol produced is high-temperature methanol vapor. The heat of the high-temperature methanol vapor is converted by the methanol vapor heat pump module and is used to heat the electrolyte of the water electrolysis hydrogen production module. The seawater heat pump module uses the endless seawater at sea to extract and exchange heat, thereby heating the electrolyte. The methanol vapor heat pump module and the seawater heat pump module can work alone or in combination, thereby improving the electrolysis efficiency in the hydrogen production process. In the process of heat exchange, methanol is made easier to liquefy, and the heat of the high-temperature methanol vapor is recovered and reused to achieve the purpose of energy saving. At the same time, the high-temperature methanol vapor is liquefied into liquefied methanol, thereby facilitating the storage of methanol. The offshore wind power hydrogen production-ammonia-alcohol multi-connected system enables the water electrolysis hydrogen production module, methanol synthesis module, ammonia synthesis module and methanol steam heat pump module on the system to operate in a coordinated manner, ensuring the safe and stable production of each module, and also improving the efficiency of electrolytic hydrogen production, which can achieve the goal of energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a top view schematic diagram of an offshore wind power hydrogen production-ammonia-alcohol multi-connected system provided by a specific embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of a composite heat pump system provided in a specific embodiment of the present invention;

[0021] Figure 3 It is a longitudinal cross-sectional schematic diagram of an offshore wind power hydrogen production-ammonia-alcohol multi-connection system provided by a specific embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of the module composition of an offshore wind power hydrogen production-ammonia-alcohol multi-connected system provided in a specific embodiment of the present invention.

[0023] In the figure:

[0024] 100, water electrolysis hydrogen production module; 101, hydrogen buffer tank; 102, fresh water tank; 103, nitrogen filling module; 104, seawater desalination module; 110, electrolyzer; 111, hydrogen separator; 112, oxygen separator; 120, alkali liquid tank; 121, first liquid inlet pipe; 122, first liquid return pipe; 123, second liquid inlet pipe; 124, second liquid return pipe; 125, first branch pipe; 126, second branch pipe; 127, stop valve; 130, third water pump;

[0025] 200, methanol synthesis module; 210, carbon dioxide storage tank; 220, methanol storage tank;

[0026] 300, ammonia synthesis module; 310, nitrogen buffer tank; 320, liquid ammonia storage tank;

[0027] 400, composite heat pump system; 401, high-temperature methanol steam; 402, liquefied methanol; 410, methanol steam heat pump module; 411, first evaporator; 412, first compressor; 413, first condenser; 414, first water pump; 420, seawater heat pump module; 421, second evaporator; 422, second compressor; 423, second condenser; 424, second water pump;

[0028] 500, control module; 510, power module;

[0029] 600, support platform; 601, internal chamber; 602, photovoltaic panel; 603, support frame; 610, center part; 620, support part. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] Please refer to Figure 1 and Figure 2 In this embodiment, the offshore wind power hydrogen production-ammonia-alcohol multi-connected system includes a water electrolysis hydrogen production module 100, a methanol synthesis module 200, an ammonia synthesis module 300, a methanol steam heat pump module 410 and a seawater heat pump module 420. The water electrolysis hydrogen production module 100 is used to use offshore wind power to electrolyze water to generate hydrogen, and the generated hydrogen is stored in a hydrogen buffer tank 101; the methanol synthesis module 200 is connected to the hydrogen buffer tank 101, and the methanol synthesis module 200 is used to synthesize high-temperature methanol steam 401; the ammonia synthesis module 300 is connected to the hydrogen buffer tank 101, and the ammonia synthesis module Block 300 is used for synthesizing ammonia; the above-mentioned methanol steam heat pump module 410 includes a first evaporator 411, a first compressor 412 and a first condenser 413 which are interconnected and form a cycle, the above-mentioned first evaporator 411 is connected to the above-mentioned high-temperature methanol steam 401 for heat exchange, and the above-mentioned first condenser 413 is connected to the electrolyte of the above-mentioned water electrolysis hydrogen production module 100 for heat exchange; the above-mentioned seawater heat pump module 420 includes a second evaporator 421, a second compressor 422 and a second condenser 423 which are interconnected and form a cycle, and the above-mentioned second condenser 423 is connected to the electrolyte of the above-mentioned water electrolysis hydrogen production module 100 for heat exchange.

[0035] The offshore wind power hydrogen production-ammonia-alcohol multi-connected system in this embodiment includes a water electrolysis hydrogen production module 100, a methanol synthesis module 200, an ammonia synthesis module 300 and a methanol steam heat pump module 410. The hydrogen produced by the water electrolysis hydrogen production module 100 is stored in a hydrogen buffer tank 101, and then the hydrogen is supplied to the methanol synthesis module 200 and the ammonia synthesis module 300 to synthesize the hydrogen into the required ammonia and methanol. In this process, the methanol produced is high-temperature methanol vapor 401, and the heat of the high-temperature methanol vapor 401 is converted by the methanol vapor heat pump module 410 and is The seawater heat pump module 420 is used to heat the electrolyte of the water electrolysis hydrogen production module 100, and the seawater heat pump module 420 uses the endless seawater at sea to extract and exchange heat, thereby heating the electrolyte, and the methanol steam heat pump module and the seawater heat pump module 420 can work alone or in conjunction with each other, thereby improving the electrolysis efficiency in the hydrogen production process. In the heat exchange process, methanol is more easily liquefied, and the heat of the high-temperature methanol steam 401 is recovered and reused to achieve energy saving. At the same time, the high-temperature methanol steam 401 is liquefied into liquefied methanol 402, thereby facilitating the storage of methanol. The offshore wind power hydrogen production-ammonia-alcohol multi-connected system can make the water electrolysis hydrogen production module 100, the methanol synthesis module 200, the ammonia synthesis module 300 and the methanol steam heat pump module 410 on the system work together to ensure the safe and stable production of each module, and also improve the efficiency of hydrogen production by electrolysis, which can achieve the purpose of energy saving and emission reduction.

[0036] Furthermore, the electrolytic water hydrogen production module 100 includes an electrolytic cell 110 and an alkali liquid tank 120 that are interconnected. The alkali liquid tank 120 is used to store electrolyte and inject the electrolyte into the electrolytic cell 110. The electrolytic cell 110 is connected to the hydrogen buffer tank 101, and the alkali liquid tank 120 is connected to the first condenser 413 for heat exchange. The alkali liquid tank 120 stores an alkaline liquid electrolyte, such as sodium hydroxide and potassium hydroxide. Specifically, the electrolyte is generally a potassium hydroxide solution with a mass concentration of 30% or a sodium hydroxide solution with a mass concentration of 26%, so that a certain conductivity is guaranteed when electrolyzing water to produce hydrogen, thereby improving the electrolysis efficiency. And in the current electrolytic water hydrogen production technology, the technology of injecting alkaline solution into the electrolytic cell 110 for electrolysis is the most mature and has the lowest production cost.

[0037] In this embodiment, a seawater desalination module 104 is also included. The seawater desalination module 104 is used to store desalinated seawater in a fresh water tank 102, and the fresh water tank 102 provides fresh water to the alkali liquid tank 120, which is mixed with the electrolyte in the alkali liquid tank 120 to form an electrolyte, which is used when the electrolysis cell 110 electrolyzes hydrogen.

[0038] Further, on the platform of the water electrolysis hydrogen production module 100, the water electrolysis hydrogen production module 100 is placed in a confined space and isolated from the outside world. Specifically, after the water electrolysis hydrogen production module 100 is installed, the space is sealed with anti-corrosion concrete, relying on the isolation of the concrete from the outside world, and the sealing effect is ensured by high-performance sealing strips at the doors and windows to achieve airtightness. After the construction is completed, the nitrogen filling module 103 is relied on to carry out nitrogen filling, and the closed water electrolysis hydrogen production module 100 space is kept always with a nitrogen filling pressure between 0.05MPa-0.3MPa, which is used to protect the water electrolysis hydrogen production equipment from being corroded by the humid marine atmosphere environment, and also prevent the risk of explosion after hydrogen leakage, thereby improving the reliability and service life of the equipment. In addition, video monitoring terminals and pressure sensors are arranged in the confined space, which can facilitate observation and monitoring of the situation inside. The produced hydrogen is transported to the hydrogen cache tank of the gas-liquid storage module through a pipeline for use in the next step.

[0039] Optionally, the seawater heat pump module 420 includes a second evaporator 421, a second compressor 422, and a second condenser 423 that are interconnected and form a cycle, and the second evaporator 421 is connected to the seawater circulation pipeline for heat exchange, and the second condenser 423 is connected to the alkali liquid tank 120 for heat exchange. The seawater heat pump module 420 uses the endless seawater at sea to extract and exchange heat, thereby heating the alkali liquid tank 120, ensuring that the electrolyte is electrolyzed at a higher temperature and improving the electrolysis efficiency, and the methanol steam heat pump module 410 and the seawater heat pump module 420 can work alone or in conjunction to heat the electrolyte in the alkali liquid tank 120, thereby further improving the electrolysis efficiency. In this embodiment, the first water pump 414 is used to realize the circulation of the methanol steam heat pump module 410, and the second water pump 424 is used to realize the internal circulation of the seawater heat pump module 420.

[0040] It should be noted that the methanol steam heat pump module 410 and the seawater heat pump module 420 together constitute the composite heat pump system 400 in this embodiment. Figure 1 shown.

[0041] Specifically, the alkali liquid tank 120 is connected to the second condenser 423 through the first liquid inlet pipe 121 and the first liquid return pipe 122, the alkali liquid tank 120 is connected to the electrolytic cell 110 through the second liquid inlet pipe 123 and the second liquid return pipe 124, the first liquid inlet pipe 121 is also connected to the second liquid inlet pipe 123 through the first branch pipe 125, and the second liquid return pipe 124 is also connected to the first liquid return pipe 122 through the second branch pipe 126. Thus, the coordinated work of the methanol steam heat pump module 410 and the seawater heat pump module 420 can be achieved, the heat of the seawater can be transferred to the electrolyte, and the heat generated by the methanol synthesis module 200 can be recovered and further utilized. The energy released by the gaseous methanol is absorbed during the liquefaction process, which not only achieves energy saving, but also further improves the electrolysis efficiency.

[0042] like Figure 2 As shown, the second liquid return pipe 124 is close to one end of the alkali liquid tank 120, the second liquid inlet pipe 123 is close to one end of the alkali liquid tank 120, the first branch pipe 125 and the second branch pipe 126 are all provided with a stop valve 127, so that the alkali liquid tank 120, the second liquid return pipe 124, the electrolytic cell 110 and the second liquid inlet pipe 123 are connected in sequence to form a first cycle, and the first liquid inlet pipe 121, the first branch pipe 125, the electrolytic cell 110, the second liquid return pipe 124, the second branch pipe 126 and the first liquid return pipe 122 form a second cycle.

[0043] Specifically, when the electrolyzer 110 does not need to produce hydrogen, the first liquid inlet pipe 121, the first branch pipe 125, the electrolyzer 110, the second liquid return pipe 124, the second branch pipe 126 and the first liquid return pipe 122 form a second cycle to achieve continuous insulation and internal alkali liquid flow inside the electrolyzer 110, so that the electrolyzer 110 is always in an insulation state and can be quickly hot-started when work is needed. The specific operation is: close the stop valve 127c and the stop valve 127d, and open the stop valve 127a and the stop valve 127b at the same time, so that the circulating heat of the seawater heat pump module 420 is converted with the inlet and outlet liquid pipelines of the electrolyzer 110, and only the alkali liquid of the electrolyzer 110 can be circulated and heated and kept warm under the action of the first water pump 414, so that the electrolyzer 110 system is in an insulation state. When the electrolyzer 110 produces hydrogen, the alkali liquid tank 120, the second liquid return pipe 124, the electrolyzer 110 and the second liquid inlet pipe 123 are connected in sequence to form a first cycle, and the electrolyte in the electrolyte tank is heated, thereby indirectly heating the alkali liquid required inside the electrolyzer 110. The specific operation is: close the stop valve 127a and the stop valve 127b, and open the stop valve 127c and the stop valve 127d at the same time, the methanol steam heat pump module 410 and the seawater heat pump module 420 are both connected to the alkali liquid tank 120, and the heat of the high-temperature methanol steam 401 and the seawater are used to heat the electrolyte inside, respectively, to provide the electrolyzer 110 with an electrolyte that meets the temperature requirements, and improve the efficiency of hydrogen production by electrolysis of water.

[0044] In the process of hydrogen production by electrolysis, the electrolyte coming out of the electrolytic cell 110 is divided into two paths: one path is rich in hydrogen, and the other path is rich in oxygen. They respectively enter the hydrogen separator 111 and the oxygen separator 112 placed in the gas-liquid separation device. After the hydrogen and oxygen are separated, the two paths of electrolyte merge and enter the third water pump 130. After being pressurized by the third water pump 130, they return to the alkali liquid tank 120, thereby realizing the circulation of the electrolyte in the water electrolysis hydrogen production module 100.

[0045] Optionally, the offshore wind power hydrogen production-ammonia-alcohol multi-connected system further includes a control module 500 and a power module 510, wherein the control module 500 is electrically connected to the power module 510, and the power module 510 is electrically connected to the offshore wind turbine. The control module 500 is electrically connected to the water electrolysis hydrogen production module 100, the methanol synthesis module 200, the ammonia synthesis module 300, the methanol steam heat pump module 410 and the seawater heat pump module 420. The control module 500 is the control system of the entire platform, which can coordinate or individually control the start and stop of each system module and equipment device on the platform or other adjustment control, so that each system module and equipment device on the platform can operate more safely, intelligently and stably. The power module 510 is used to store the excess electric energy generated by the wind turbine, so that when the wind turbine power is insufficient, the offshore wind power hydrogen production-ammonia-alcohol multi-connected system can be replenished in time to ensure that the system can operate reliably.

[0046] Specifically, the power module 510 also includes a transformer, a hydrogen production power supply, a UPS power supply, etc., which are used to transform the power generated by the wind turbine, perform AC / DC conversion, and serve as a backup power supply.

[0047] like Figure 1 and Figure 3 As shown, the offshore wind power hydrogen production-ammonia-alcohol multi-connection system further includes a support platform 600, the support platform 600 includes a central part 610 and three support parts 620 arranged around the periphery of the central part 610, the control module 500 and the power module 510 are both arranged in the central part 610, and the three support parts 620 are respectively provided with the water electrolysis hydrogen production module 100, the methanol synthesis module 200 and the ammonia synthesis module 300. Specifically, the support platform 600 is the main installation and support space of the offshore wind power hydrogen production-ammonia-alcohol multi-connection system, and the whole is in the shape of a capital letter "Y", with three support parts 620, namely, the water electrolysis hydrogen production module 100, the ammonia synthesis module 300 platform, and the methanol synthesis module 200. The Y-shaped structure also facilitates the docking and loading and unloading of transport ships, and is very suitable for transporting the prepared liquid ammonia and methanol by marine ships.

[0048] The three support parts 620 can be symmetrically distributed or asymmetrical. The angles between the support parts 620 can be different and can be adjusted according to design requirements. The preferred angle is symmetrically distributed at 120 degrees, but it can also be adjusted, preferably in the range of 60 to 180 degrees. Specifically, the three support parts 620 are all located on the support frame 603 and are rigidly connected to the support frame 603 to ensure that the entire platform has strong rigidity and strength. Specifically, the above-mentioned support frame 603 is made by welding with universal steel pipe piles, which can provide a strong and solid foundation support for the entire platform. Each branch platform is supported by a row of steel pipe piles at both ends in the length direction, and the number can be 2 to 4, which is specifically set according to the width of the branch platform. After the on-site construction of the support frame 603, a steel pipe welding area with the three support parts 620 is reserved at the top, and at the same time, the bottom installation area of ​​the three support parts 620 also has an area that can be connected to the support frame 603, which will not be repeated here.

[0049] Optionally, the outer wall of the support platform 600 is also provided with a photovoltaic panel 602, and the photovoltaic panel 602 is electrically connected to the power module 510. Specifically, the support portion 620 of the support platform 600 is heptagonal in shape as a whole, and is made of prefabricated reinforced concrete. It is provided with a hollow internal chamber 601 for installing the above-mentioned modules, and specifically, the building materials are transported to the sea by ship for on-site installation. The bottom surface of the support portion 620 is a plane, and the two end surfaces are also planes, but the top surface and the left and right side surfaces are axially extended by a triangular cross section so that the single plane is divided into two planes inclined to both sides along the triangle vertex, which are used to share the horizontal wind load and reduce the force on the side. The triangle angle of the vertex angles of the two sides and the top surface can be between 60 degrees and 160 degrees, and each surface can be equal or unequal. In this embodiment, 150 degrees is selected. By setting the side and top surfaces with triangular cross sections, the area of ​​the side and top surfaces can also be increased for laying photovoltaic panels 602, as shown in the attached Figure 3 As shown, the offshore wind and light resources can be fully utilized. At the same time, due to the reflection of the sea surface, the photovoltaic panels 602 in the lower area will also have a better light-receiving and power generation effect.

[0050] In this embodiment, the angle between the three support parts 620 is 120 degrees, and the height of the platform is also the same. The above-mentioned central part 610 is constructed by cast-in-place reinforced concrete after the three support parts 620 are installed in place on site. Pipelines and pedestrian passages are also left between the central part 610 and the three support parts 620.

[0051] Optionally, the water electrolysis hydrogen production module 100 is accommodated in a nitrogen filling module 103, the nitrogen filling module 103 is connected to a nitrogen buffer tank 310, and the nitrogen buffer tank 310 is connected to the ammonia synthesis module 300. Specifically, the nitrogen filling module 103 is used to protect the water electrolysis hydrogen production module 100 from corrosion by seawater vapor, ensuring that the water electrolysis hydrogen production module 100 operates reliably and for a long life. At the same time, the nitrogen in the nitrogen filling module 103 can also be transported to the nitrogen buffer tank 310 by pipeline to provide the ammonia synthesis module 300 with ammonia. The nitrogen buffer tank 310 can also be replenished by external ships and pipelines, which will not be repeated here.

[0052] Furthermore, the methanol synthesis module 200 also includes a carbon dioxide storage tank 210 for storing carbon dioxide required for producing methanol. The carbon dioxide can be replenished through pipelines or external ships. The produced liquefied methanol 402 is stored in the methanol storage tank 220 and transported outward by ship.

[0053] It should be noted that the ammonia synthesis module 300 is a set of commonly used synthetic ammonia reaction devices, which is used to synthesize ammonia from hydrogen and nitrogen produced by electrolysis of water, including a compression system, a synthesis reactor, a heat exchange system, and a separation system. The liquid ammonia, that is, liquid ammonia, is finally stored in a liquid ammonia storage tank 320, which is convenient for transportation by ship or pipeline. The methanol synthesis module 200 is a set of commonly used synthetic methanol reaction devices, which is used to synthesize methanol from hydrogen and carbon dioxide produced by electrolysis of water, including a compression system, a synthesis reactor, a heat exchange system, a separation system, and a by-product water transportation system. The above-mentioned by-product water transportation system is used to recover the by-product water after the synthesis of methanol from carbon dioxide and hydrogen, and transport it to the fresh water tank 102 of the electrolysis water hydrogen production module 100 for utilization to reduce waste.

[0054] like Figure 2 and Figure 4 As shown, specifically, the control module 500 includes a wind turbine power prediction module, a high-performance server module and a DCS system module; the above-mentioned wind turbine power prediction module is used to predict the power generation of offshore wind turbines in the future, and the power prediction data is connected to the high-performance server module, the high-performance server module processes and analyzes the data, and then passes it to the DCS system module, so that the collaborative control system module can control and reasonably arrange the production activities of offshore wind power hydrogen-ammonia-alcohol to ensure the normal operation of production.

[0055] The above-mentioned high-performance server module is the processing center for data input and output. It integrates many artificial intelligence algorithms for production operations, such as market demand prediction algorithm, fault analysis and diagnosis algorithm and electrolyzer 110 power allocation algorithm, which can realize intelligent management and control of the entire process from energy supply to production output, making the platform's hydrogen-ammonia-alcohol production more intelligent and more efficient. The high-performance server module interacts with the DCS system module through the API interface.

[0056] The above-mentioned DCS system module is composed of various controllers, switches, I / O cards, etc., which are used for data acquisition and process control, so as to centrally manage and hierarchically control various system modules and equipment devices to ensure that all systems can operate in coordination. The DCS system module mainly controls the seawater desalination module 104, the nitrogen filling module 103, the power module 510, the seawater heat pump module 420 and the methanol steam heat pump module 410 in the composite heat pump system 400, the water electrolysis hydrogen production module 100, the ammonia synthesis module 300, the methanol synthesis module 200 and the video monitoring terminal.

[0057] Specifically, in the water electrolysis hydrogen production module 100, the control module 500 monitors the temperature, pressure, gas flow rate and other data in the electrolytic cell 110 in real time by performing temperature monitoring, gas flow monitoring, gas purity monitoring and the like of the water electrolysis hydrogen production module 100, and adjusts the power input, current, voltage, pressure, alkali solution flow rate, temperature and the like of the operation process through PID control or other advanced control strategies.

[0058] In the ammonia synthesis module 300, the control module 500 mainly controls the reaction process. Specifically, the control module 500 monitors the pressure, temperature, gas flow and purity in the reactor, and displays the pressure, temperature and gas flow in the reactor, as well as the purity data of the generated ammonia gas in real time. According to the preset control logic, when the preset value range is not met, the reaction conditions are adjusted through PID control or other advanced control strategies to ensure the stable operation of green hydrogen synthesis ammonia.

[0059] In the methanol synthesis module 300, the control module 500 controls the reaction process. Specifically, the control module 500 monitors the pressure, temperature, gas flow rate and product purity in the reactor, and displays the pressure, temperature, gas flow rate and product purity data in real time. According to the preset control logic, when the preset value range is not met, the reaction conditions are adjusted through PID control or other advanced control strategies to ensure the stable operation of green hydrogen synthesis methanol.

[0060] In the composite heat pump system 400, the DCS system controls the seawater heat pump module 420 and the methanol steam heat pump module 410 respectively, and can start and stop the two heat pump modules according to actual needs. If the alkali liquid tank 120 requires a higher temperature, both heat pump modules can be started, and in particular, the higher heat generated by the methanol steam heat pump module 410 is used to heat the electrolyte. If the electrolytic cell 110 needs to stop running, only one seawater heat pump module 420 is required to work, and the electrolyte in the electrolytic cell 110 is only connected to the seawater heat pump module 420 for insulation.

[0061] In addition, the above-mentioned control module also has functions such as alarm and interlocking, which can take timely measures under abnormal circumstances to ensure production safety.

[0062] Furthermore, the control module 500 can also dynamically adjust relevant production processes according to the power supply, the quantity of raw materials and the changes in market demand. For example, if the power supply is insufficient, or the offshore wind turbines can be connected to the power grid and there is no wind and power abandonment, the surplus electricity can be temporarily used only for hydrogen production without synthetic ammonia and synthetic methanol production; and when the power generated by the offshore wind turbines is limited in connection with the grid or the output is limited, a combined production process of electrolyzing water to produce hydrogen and synthesizing ammonia with green hydrogen can be carried out, or a combined production process of electrolyzing water to produce hydrogen and synthesizing methanol with green hydrogen can be carried out, and even the three chemical processes can be carried out simultaneously to achieve the best economic benefits.

[0063] Another object of the present invention is to provide an offshore wind power hydrogen production-ammonia-alcohol method, which is used to control an offshore wind power hydrogen production-ammonia-alcohol multi-connected system as described in any of the above schemes, including the following steps: S1, an offshore wind turbine and a photovoltaic panel 602 generate electricity to supply power to the above-mentioned water electrolysis hydrogen production module 100, and the hydrogen produced by the above-mentioned water electrolysis hydrogen production module 100 is stored in a hydrogen buffer tank 101; S2, the above-mentioned methanol synthesis module 200 uses the hydrogen in the above-mentioned hydrogen buffer tank 101 to synthesize high-temperature methanol steam 401; S3, the above-mentioned methanol steam heat pump module 410 uses the heat of the above-mentioned high-temperature methanol steam 401 to heat the electrolyte of the above-mentioned water electrolysis hydrogen production module 100; S4, the above-mentioned ammonia synthesis module 300 uses the hydrogen in the above-mentioned hydrogen buffer tank 101 to synthesize ammonia.

[0064] The offshore wind power hydrogen production-ammonia-alcohol method is used to control the offshore wind power hydrogen production-ammonia-alcohol multi-connected system as described in any of the above schemes, which can jointly produce hydrogen, methanol and ammonia, and can realize the offshore wind power to electrolyze water to produce hydrogen, and use hydrogen to synthesize ammonia and methanol, so as to realize the preparation of two chemicals, and the production operation is more intelligent, safer and more stable. The heat of the high-temperature methanol steam 401 generated when synthesizing methanol can be used to heat and keep the electrolyte of the water electrolysis hydrogen production module 100, which greatly shortens the startup time of the electrolyzer 110, improves efficiency, and can also achieve energy saving.

[0065] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Offshore wind power hydrogen production-ammonia-alcohol multi-connection system, characterized in that: include: A water electrolysis hydrogen production module (100), wherein the water electrolysis hydrogen production module (100) is used to use offshore wind power to electrolyze water to generate hydrogen, and the generated hydrogen is stored in a hydrogen buffer tank (101); A methanol synthesis module (200), the methanol synthesis module (200) being connected to the hydrogen buffer tank (101), and the methanol synthesis module (200) being used to synthesize high-temperature methanol steam (401); an ammonia synthesis module (300), the ammonia synthesis module (300) being connected to the hydrogen buffer tank (101), and the ammonia synthesis module (300) being used for synthesizing ammonia; A methanol steam heat pump module (410), the methanol steam heat pump module (410) comprising a first evaporator (411), a first compressor (412) and a first condenser (413) which are interconnected and form a cycle, the first evaporator (411) being connected to the high-temperature methanol steam (401) for heat exchange, and the first condenser (413) being connected to the electrolyte of the water electrolysis hydrogen production module (100) for heat exchange; A seawater heat pump module (420), the seawater heat pump module (420) comprising a second evaporator (421), a second compressor (422) and a second condenser (423) which are interconnected and form a cycle, the second condenser (423) being connected to the electrolyte of the water electrolysis hydrogen production module (100) for heat exchange.

2. The offshore wind power hydrogen production-ammonia-alcohol multi-connection system according to claim 1, characterized in that: The water electrolysis hydrogen production module (100) comprises an electrolytic cell (110) and an alkali liquid tank (120) which are interconnected, wherein the alkali liquid tank (120) is used to store electrolyte and inject the electrolyte into the electrolytic cell (110), the electrolytic cell (110) is connected to the hydrogen buffer tank (101), and the alkali liquid tank (120) is connected to the first condenser (413) for heat exchange.

3. The offshore wind power hydrogen production-ammonia-alcohol multi-connection system according to claim 2 is characterized in that: The second evaporator (421) is connected to the seawater circulation pipeline for heat exchange, and the second condenser (423) is connected to the alkali liquid tank (120) for heat exchange.

4. The offshore wind power hydrogen production-ammonia-alcohol multi-connection system according to claim 3 is characterized in that: The alkali liquid tank (120) is connected to the second condenser (423) via a first liquid inlet pipe (121) and a first liquid return pipe (122); the alkali liquid tank (120) is connected to the electrolytic cell (110) via a second liquid inlet pipe (123) and a second liquid return pipe (124); the first liquid inlet pipe (121) is also connected to the second liquid inlet pipe (123) via a first branch pipe (125); the second liquid return pipe (124) is also connected to the first liquid return pipe (122) via a second branch pipe (126).

5. The offshore wind power hydrogen production-ammonia-alcohol multi-connection system according to claim 4 is characterized in that: One end of the second liquid return pipe (124) close to the alkali liquid tank (120), one end of the second liquid inlet pipe (123) close to the alkali liquid tank (120), the first branch pipe (125) and the second branch pipe (126) are all provided with a stop valve (127), so that the alkali liquid tank (120), the second liquid return pipe (124), the electrolytic cell (110) and the second liquid inlet pipe (123) are connected in sequence to form a first cycle, and the first liquid inlet pipe (121), the first branch pipe (125), the electrolytic cell (110), the second liquid return pipe (124), the second branch pipe (126) and the first liquid return pipe (122) form a second cycle.

6. The offshore wind power hydrogen-ammonia-alcohol multi-connection system according to claim 1, characterized in that: The offshore wind power hydrogen production-ammonia-alcohol multi-connected system further comprises a control module (500) and a power module (510), wherein the control module (500) is electrically connected to the power module (510), the power module (510) is electrically connected to an offshore wind turbine, and the control module (500) is electrically connected to the water electrolysis hydrogen production module (100), the methanol synthesis module (200), the ammonia synthesis module (300), the methanol steam heat pump module (410) and the seawater heat pump module (420).

7. The offshore wind power hydrogen-ammonia-alcohol multi-connection system according to claim 6, characterized in that: The offshore wind power hydrogen production-ammonia-alcohol multi-connected system also includes a support platform (600), the support platform (600) includes a central part (610) and three support parts (620) arranged around the central part (610), the control module (500) and the power module (510) are both arranged in the central part (610), and the three support parts (620) are respectively provided with the water electrolysis hydrogen production module (100), the methanol synthesis module (200) and the ammonia synthesis module (300).

8. The offshore wind power hydrogen production-ammonia-alcohol multi-connection system according to claim 7, characterized in that: The outer wall of the support platform (600) is also provided with a photovoltaic power generation panel (602), and the photovoltaic power generation panel (602) is electrically connected to the power module (510).

9. The offshore wind power hydrogen production-ammonia-alcohol multi-connection system according to any one of claims 1 to 8, characterized in that: The water electrolysis hydrogen production module (100) is accommodated in a nitrogen filling module (103), the nitrogen filling module (103) is connected to a nitrogen buffer tank (310), and the nitrogen buffer tank (310) is connected to the ammonia synthesis module (300).

10. Offshore wind power hydrogen-ammonia-alcohol method, characterized in that: Used to control the offshore wind power hydrogen production-ammonia-alcohol multi-connected system according to any one of claims 1 to 9, comprising the steps of: S1, an offshore wind turbine and a photovoltaic panel (602) generate electricity to supply power to the water electrolysis hydrogen production module (100), and the hydrogen produced by the water electrolysis hydrogen production module (100) is stored in a hydrogen buffer tank (101); S2, the methanol synthesis module (200) synthesizes high-temperature methanol steam (401) using the hydrogen in the hydrogen buffer tank (101); S3, the methanol steam heat pump module (410) uses the heat of the high-temperature methanol steam (401) to heat the electrolyte of the water electrolysis hydrogen production module (100); S4. The ammonia synthesis module (300) synthesizes ammonia using the hydrogen in the hydrogen buffer tank (101).

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