Offshore floating type energy storage device system

Abstract

The utility model provides an offshore floating type energy storage device system. The offshore floating type energy storage device system comprises an offshore floating type platform; a seawater electrolysis hydrogen production device, a seawater desalination device, an electrolysis hydrogen production device, a hydrogen liquefaction device, a hydrogen storage device, a power distribution module and a battery module are arranged on the offshore floating platform. According to the offshore floating type energy storage system provided by the utility model, the container battery is matched with the water electrolysis hydrogen production technology, the hydrogen production module adopts two hydrogen production modes of seawater electrolysis and seawater desalination electrolysis parallel connection, and hydrogen production can be flexibly configured and adjusted according to actual conditions such as electric energy supply and equipment capacity; and the hydrogen production and storage flexibility and stability of the system are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to offshore engineering technical field relates to a kind of offshore energy storage device, especially to a kind of offshore floating energy storage device system. BACKGROUND

[0002] Offshore wind energy is a kind of renewable energy and resource is abundant, and its large-scale development and utilization faces the double challenges of grid-connection and off-grid energy storage. In terms of grid-connection, although flexible DC transmission technology can solve the problem of long-distance power transmission, it is limited by the immaturity of DC circuit breaker technology, harmonic loss, high cost of submarine cable and converter station construction, superimposed high-salt mist corrosion environment and ecological impact, and there are significant technical and economic bottlenecks in practical application. In off-grid scenarios, wind power hydrogen production has become the mainstream direction, however, the mobility of floating platforms can affect the operating life and system stability of water electrolysis hydrogen production equipment, and the randomness, volatility and intermittency of wind power can affect the efficiency and safety of hydrogen production equipment. The subsequent conversion of hydrogen energy needs to solve the problem of secondary energy storage form selection: the preparation of methanol requires additional carbon sources, such as the transportation of carbon dioxide on the shore, and the synthesis process is accompanied by reaction heat loss and equipment energy consumption; the synthesis of ammonia depends on large air separation equipment to obtain nitrogen, and the high-temperature and high-pressure process requires high energy consumption and equipment complexity, at the same time, the toxicity of ammonia increases the safety risk of storage and transportation. For example, CN216215922U discloses a sea hydrogen production ammonia storage platform based on wind power, which includes a seawater desalination device, an electrolytic hydrogen production module, an air nitrogen production module, an ammonia production module, an ammonia liquefaction module, etc. CN215904702U discloses a sea hydrogen production methanol storage platform based on wind power, which has a methanol fuel power generation module, a power distribution module, a methanol storage tank and a carbon dioxide storage tank under the deck of the floating platform, and a seawater desalination device, an electrolytic hydrogen production module, a carbon dioxide capture module and a methanol production module are arranged above the deck of the floating platform.

[0003] CN118273295A discloses a sea wind power hydrogen production system and method, which comprises a hydrogen production process module, a sea wind power system, a hydrogen energy liquefaction module, a storage module, a sea platform main body and a transportation module. The energy source and storage mode of this hydrogen production system are single, and the ability to cope with the fluctuation of sea wind power is insufficient. CN218907559U discloses a novel wind power transportation ship, which comprises a ship body and a plurality of battery energy storage modules. The ship body is provided with a charging end and a connection site connected with a flexible traction device of a sea power generation equipment. The sea buoy charging platform charges the battery energy storage modules on the wind power transportation ship. After the ship arrives at the port, the battery energy storage modules fully charged are unloaded and the battery energy storage modules to be charged are loaded, so as to transport the sea wind power energy. This scheme has certain defects in energy storage capacity, economy and flexibility. The volumetric energy density of liquid hydrogen is higher than that of the battery. Therefore, for the large-scale and intermittent renewable energy of sea wind power, the battery energy storage may not meet all the consumption needs. The cycle life of the battery is limited. With the increase of charging and discharging times, the performance of the battery will gradually decrease. The battery energy storage is high in initial investment and retired equipment recovery cost. The battery energy storage has certain requirements for the installation environment and is insufficient in flexibility.

[0004] In summary, it is urgent to develop a new energy storage system suitable for marine environment, having a barge transportation capacity, and having high efficient energy conversion and economy, to solve the problem of sea wind power utilization. Practical new type content

[0005] The utility model aims at providing a sea floating energy storage device system, solves the energy storage problem of the fluctuation of sea wind power.

[0006] In order to achieve the utility model purposes, the utility model adopts the following technical schemes:

[0007] The utility model provides a sea floating energy storage device system, the sea floating energy storage device system includes: sea floating platform, be provided with on the sea floating platform:

[0008] The sea water electrolysis hydrogen production device can electrolyze sea water and generate hydrogen;

[0009] The sea water desalination device can desalinate sea water into fresh water;

[0010] The electrolysis hydrogen production device is connected with the sea water desalination device, can electrolyze fresh water and generate hydrogen;

[0011] The hydrogen liquefaction device is connected with the sea water electrolysis hydrogen production device and the electrolysis hydrogen production device respectively, can liquefy the generated hydrogen and generate liquid hydrogen;

[0012] A hydrogen storage device connected to the hydrogen liquefaction device and capable of storing the liquid hydrogen;

[0013] A power distribution module capable of being electrically connected to and supplying power to the electrolytic seawater hydrogen production device, the seawater desalination device, the electrolytic hydrogen production device and the hydrogen liquefaction device respectively;

[0014] A battery module electrically connected to the power distribution module and capable of storing excess wind power or outputting stored power.

[0015] When the wind-generated power is greater than the total power required by the offshore floating energy storage device system, the power distribution module controls the battery module to store the excess power; when the wind-generated power is less than the total power required by the offshore floating energy storage device system, the power distribution module controls the battery module to output the stored power to supplement the required power.

[0016] The offshore energy storage system provided by the utility model takes hydrogen as the main energy storage mode, and hydrogen is produced in parallel through electrolytic seawater and seawater desalination electrolysis, which can be flexibly configured and adjusted according to actual conditions such as power supply and equipment capacity, for example, hydrogen is produced in parallel by two methods or by one method, when the power supply changes or there is a problem with the equipment, the two methods can be used as backup for each other, the hydrogen production flexibility is improved, the stability and fault tolerance of the system are improved, and the hydrogen energy supply is stable. While hydrogen energy storage is the main mode, the platform is also provided with a battery module, which is charged and stored when the wind power is sufficient, and discharged to ensure the power supply of the platform device when the wind power is insufficient, thereby playing the role of peak shaving and avoiding frequent start-stop and low efficiency of the hydrogen production device under fluctuating wind power input, thereby ensuring stable hydrogen energy storage and improving the stability of the system. The offshore floating energy storage system of the utility model has lower operation and maintenance difficulty and smaller influence on the marine environment compared with the use of offshore wind power through submarine cables; compared with ammonia and methanol energy storage, the link of preparing ammonia and methanol after water electrolysis hydrogen production is reduced, the equipment system is more simple, the energy loss of the energy storage system is small, and the demand for external reaction raw materials is less.

[0017] Preferably, the electrolytic seawater hydrogen production device, the electrolytic hydrogen production device and the hydrogen liquefaction device are arranged adjacent to each other on the deck at the tail of the offshore floating platform.

[0018] Preferably, the power distribution module and the seawater desalination device are arranged below the deck at the tail of the offshore floating platform.

[0019] Preferably, the seawater desalination device is arranged below the electrolytic hydrogen production device.

[0020] Preferably, the hydrogen storage device is arranged adjacent to the hydrogen liquefaction device.

[0021] Preferably, the battery module comprises a container battery, and the battery module is located at the bow of the offshore floating platform.

[0022] Preferably, the power distribution module is electrically connected with an offshore wind power generation device, and the power generated by the offshore wind power generation device is used to supply power to the offshore floating energy storage device system through the power distribution module.

[0023] Preferably, a transformer substation is arranged between the power distribution module and the offshore wind power generation device.

[0024] Preferably, the offshore floating energy storage device system is fixed to the working position of the offshore wind farm through a mooring device.

[0025] Preferably, the hydrogen storage device comprises a pressure storage tank with a vacuum interlayer filled with thermal insulation material.

[0026] Preferably, the thermal insulation material comprises any one or a combination of at least two of expanded perlite, polyurethane foam, aerogel, glass wool or hollow glass microspheres.

[0027] Compared with the prior art, the utility model has the following beneficial effects:

[0028] The offshore floating hydrogen storage system provided by the utility model mainly uses liquid hydrogen energy storage, adopts a hydrogen production mode of parallel connection of electrolysis of seawater and seawater desalination, can be flexibly configured and adjusted according to actual conditions such as power supply and equipment capacity, the two modes can be used as backup for each other, the flexibility and stability of hydrogen production and storage are improved, the stability and fault tolerance of the system are improved, and the hydrogen energy supply is ensured to be stable. At the same time, the battery module is configured, in the case of wind power fluctuation, the battery module plays the role of peak clipping and valley filling through charging and discharging, and the platform operation and hydrogen production stability are improved. Compared with the use of submarine cables to connect offshore wind power to the grid, the operation and maintenance difficulty is lower, and the influence on the marine environment is smaller; compared with ammonia and methanol energy storage, the link of preparing ammonia and methanol after hydrogen production by water electrolysis is reduced, the equipment system is more simple, the energy loss of the energy storage system is small, and the demand for external reaction raw materials is less. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The structure schematic view of the offshore floating energy storage device system provided for the embodiment 1 is shown in the figure.

[0030] Among them, 1-offshore floating platform hull;2-electrolysis of seawater hydrogen production device;3-electrolysis hydrogen production device;4-hydrogen liquefaction device;5-hydrogen storage device;6-container battery;7-power distribution module;8-seawater desalination device;9-mooring device;

[0031] Figure 2 The hydrogen storage flow chart of the offshore floating energy storage device system provided for the embodiment 1 is shown in the figure.

[0032] Figure 3 An electric power flow diagram of the offshore floating energy storage device system provided for example 1 is shown. DETAILED DESCRIPTION

[0033] It should be understood that, in the description of the present application, the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0034] It should be noted that, in the description of the present application, unless otherwise specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0035] The technical solutions of the present application will be further illustrated below in conjunction with the drawings and through specific embodiments.

[0036] Example 1

[0037] The present embodiment provides an offshore floating energy storage device system as shown in Figure 1 The offshore floating energy storage device system comprises:

[0038] The offshore floating platform hull 1 is fixed to the operation position of the offshore wind farm by the mooring device 9. The mooring device 9 can adopt single-point mooring or multi-point mooring, and provides mooring force through the mooring device to enable the offshore floating platform hull 1 to effectively resist the influence of wind, waves and the like, avoid displacement, and realize on-site release under certain conditions.

[0039] On the tail deck of the offshore floating platform hull 1, the electrolytic seawater hydrogen production device 2, the electrolytic hydrogen production device 3 and the hydrogen liquefaction device 4 are arranged adjacent to each other.

[0040] The hydrogen storage device 5 is arranged adjacent to the hydrogen liquefaction device 4 on the offshore floating platform hull 1.

[0041] The power distribution module 7 and the seawater desalination device 8 are arranged below the tail deck of the offshore floating platform hull 1.

[0042] The bow of the offshore floating platform hull 1 is provided with a container battery 6.

[0043] In the embodiment, the hydrogen storage process of the offshore floating energy storage device system is as shown in the figure. Figure 2

[0044] The seawater electrolysis hydrogen production device 2 and the seawater desalination device 8 can be respectively connected with a seawater pump, and the seawater pump respectively delivers seawater to the seawater electrolysis hydrogen production device 2 and the seawater desalination device 8.

[0045] The seawater electrolysis hydrogen production device 2 can electrolyze seawater and generate hydrogen. The seawater electrolysis hydrogen production can be performed by an anode-coupled chlorine-free reaction method, a phase transition migration driven desalination-free in-situ direct electrolysis method, or a membrane-based seawater direct electrolysis method. The seawater electrolysis hydrogen production device 2 adopts a conventional hydrogen production device in the art, and can realize seawater direct electrolysis hydrogen production, which is a prior art, and the structure thereof is not limited in the embodiment.

[0046] The seawater desalination device 8 is connected with the electrolysis hydrogen production device 3 through a pipeline. The seawater desalination device 8 is located below the electrolysis hydrogen production device 3, so as to shorten the length of the pipeline.

[0047] The seawater desalination device 8 can desalinate seawater into fresh water, and the electrolysis hydrogen production device 3 can electrolyze fresh water and generate hydrogen. The seawater desalination device 8 can include a dedusting device and a reverse osmosis desalination device, which desalinate the introduced seawater by reverse osmosis to produce fresh water. The electrolysis hydrogen production device 3 electrolyzes the fresh water to generate hydrogen and oxygen. The principle of water electrolysis hydrogen production is that a pair of electrodes immersed in an electrolyte is separated by a diaphragm to prevent gas penetration, and when a certain direct current is passed, water is decomposed, hydrogen is generated at the cathode, and oxygen is generated at the anode. The reaction formula is as follows: cathode: 2e - + 2H2O→H2+2OH - , anode: 2OH - -2e - →H2O+0.5O2, total reaction formula: 2H2O→2H2+O2. In the embodiment, the electrolysis hydrogen production device 3 can adopt an alkaline electrolytic cell (ALK), a proton exchange electrolytic cell (PEM), or an anion exchange electrolytic cell (AEM). The seawater desalination device and the electrolysis hydrogen production device can adopt conventional devices in the art, and can realize seawater desalination and fresh water electrolysis, which are prior arts, and the structure thereof is not limited in the embodiment.

[0048] ​The electrolytic seawater hydrogen production device 2 and the electrolytic hydrogen production device 3 are connected to the hydrogen liquefaction device 4 in parallel, and the hydrogen produced by the electrolytic seawater hydrogen production device 2 and the electrolytic hydrogen production device 3 is combined and enters the hydrogen liquefaction device 4, and the hydrogen liquefaction device 4 can liquefy the hydrogen to generate liquid hydrogen. In this embodiment, the hydrogen liquefaction can adopt the pre-cooling-throttling expansion method. The hydrogen liquefaction device adopts the conventional liquefaction device in the art, and can realize the hydrogen liquefaction to generate liquid hydrogen, which is the prior art, and the structure of the hydrogen liquefaction device is not limited in this embodiment.

[0049] The hydrogen storage device 5 is connected to the hydrogen liquefaction device 4, and a liquid hydrogen pump can be arranged between the hydrogen liquefaction device 4 and the hydrogen storage device 5 to transport the liquid hydrogen output by the hydrogen liquefaction device 4 to the hydrogen storage device 5 for storage.

[0050] In this embodiment, the hydrogen storage device 5 adopts a double-layer adiabatic pressure tank with a vacuum interlayer, and the tank body is spherical or cylindrical. The vacuum interlayer is filled with adiabatic material, which can be selected from at least one of expanded perlite, polyurethane foam, aerogel, glass wool or hollow glass microspheres. The number of hydrogen storage devices 5 is configured according to the capacity of the wind farm. The hydrogen storage device adopts the conventional double-layer adiabatic pressure tank in the art, which can realize liquid hydrogen storage, which is the prior art, and the structure of the hydrogen storage device is not limited in this embodiment.

[0051] The electrolytic seawater hydrogen production device 2, the seawater desalination device 8, the electrolytic hydrogen production device 3 and the hydrogen liquefaction device 4 are electrically connected to the power distribution module 7.

[0052] The offshore wind power generation equipment is connected to the power distribution module 7 through a power transmission line, and the power distribution module 7 is electrically connected to the container battery 6.

[0053] In this embodiment, the power flow of the offshore floating energy storage device system is as shown in Figure 3

[0054] The offshore wind power generation equipment generates electric energy by using wind energy, and the power distribution module 7 delivers the electric energy generated by the offshore wind power generation equipment to the electrolytic seawater hydrogen production device 2, the seawater desalination device 8, the electrolytic hydrogen production device 3 and the hydrogen liquefaction device 4 for power supply. A substation is arranged between the power distribution module 7 and the offshore wind power generation equipment, so as to rectify and regulate the generated electric energy.

[0055] ​When the electric energy generated by the offshore wind power generation device is greater than the required total electric energy of the offshore floating energy storage device system, the container battery 6 is controlled by the power distribution module 7 to charge and store the excess electric energy; when the electric energy generated by the offshore wind power generation device is less than the required total electric energy of the offshore floating energy storage device system, the container battery 6 is controlled by the power distribution module 7 to discharge, and the container battery 6 transmits the stored electric energy to the power distribution module 7, and the power distribution module 7 supplies electric power to the seawater electrolysis hydrogen production device 2, the seawater desalination device 8, the electrolytic hydrogen production device 3 and the hydrogen liquefaction device 4. When the offshore wind power fluctuates greatly, the container battery 6 can play a role in peak clipping and valley filling, avoiding the reduction of hydrogen production efficiency of the hydrogen production device under fluctuating wind power input. The number and total capacity of the container battery 6 are determined according to the wind field fluctuation of the wind farm, the total power consumption of the ship and the demand of the container type electric ship. The specific process of supplying power to the seawater hydrogen production device 2, the seawater desalination device 8, the electrolytic hydrogen production device 3 and the hydrogen liquefaction device 4 by the power distribution module 7 and controlling the charging and discharging of the container battery 6 are all prior art, and will not be described here.

[0056] In summary, the offshore floating hydrogen storage system provided by the present application mainly uses liquid hydrogen energy storage, adopts a hydrogen production mode of parallel connection of electrolytic seawater and seawater desalination electrolysis, improves the flexibility and stability of hydrogen production and storage, and is configured with energy storage batteries. Under the condition of wind power fluctuation, the charging and discharging play a role in peak clipping and valley filling, improving the platform operation and hydrogen production stability.

[0057] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. It should be understood by those skilled in the art that any changes or replacements within the technical scope disclosed by the present application can be easily thought of by those skilled in the art, and all fall within the protection scope and disclosure scope of the present application.

Claims

1. A floating energy storage system for offshore applications, characterized in that, The offshore floating energy storage system includes: an offshore floating platform; and the offshore floating platform is equipped with: An electrolysis device for producing hydrogen from seawater, wherein the electrolysis device for producing hydrogen from seawater is capable of electrolyzing seawater and generating hydrogen gas; A seawater desalination device, which can desalinate seawater into fresh water; An electrolytic hydrogen production device, which is connected to the seawater desalination device, is capable of electrolyzing fresh water to generate hydrogen. A hydrogen liquefaction device, which is connected to the seawater electrolysis hydrogen production device and the electrolysis hydrogen production device respectively, is capable of liquefying the generated hydrogen gas and generating liquid hydrogen; A hydrogen storage device, connected to the hydrogen liquefaction device, capable of storing liquid hydrogen; The power distribution module can be electrically connected to and supply power to the seawater electrolysis hydrogen production device, the seawater desalination device, the electrolysis hydrogen production device, and the hydrogen liquefaction device, respectively. The battery module is electrically connected to the power distribution module and is capable of storing excess wind power or outputting stored electrical energy.

2. The offshore floating energy storage system according to claim 1, characterized in that, The seawater electrolysis hydrogen production unit, the electrolysis hydrogen production unit, and the hydrogen liquefaction unit are arranged adjacent to each other on the deck at the stern of the offshore floating platform.

3. The offshore floating energy storage system according to claim 1, characterized in that, The power distribution module and the seawater desalination device are both located below the deck at the stern of the offshore floating platform.

4. The offshore floating energy storage system according to claim 1, characterized in that, The seawater desalination unit is located below the electrolytic hydrogen production unit.

5. The offshore floating energy storage system according to claim 1, characterized in that, The hydrogen storage device is located adjacent to the hydrogen liquefaction device.

6. The offshore floating energy storage system according to claim 1, characterized in that, The battery module includes containerized batteries and is located at the bow of the offshore floating platform.

7. The offshore floating energy storage system according to claim 1, characterized in that, The power distribution module is electrically connected to the offshore wind power generation equipment.

8. The offshore floating energy storage system according to claim 7, characterized in that, A substation is installed between the power distribution module and the offshore wind power generation equipment.

9. The offshore floating energy storage system according to claim 1, characterized in that, The offshore floating energy storage system is fixed to the operating location of the offshore wind farm by mooring devices.

10. The offshore floating energy storage system according to claim 1, characterized in that, The hydrogen storage device includes a pressure tank with a vacuum jacket filled with insulating material.

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