CN110699699A - Hydrogen generation system and method for generating hydrogen - Google Patents
Hydrogen generation system and method for generating hydrogen Download PDFInfo
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- CN110699699A CN110699699A CN201910593938.1A CN201910593938A CN110699699A CN 110699699 A CN110699699 A CN 110699699A CN 201910593938 A CN201910593938 A CN 201910593938A CN 110699699 A CN110699699 A CN 110699699A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/05—Pressure cells
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/60—Constructional parts of cells
- C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention relates to a hydrogen generation system and a hydrogen generation method, and provides a hydrogen generation technology which can restrain the cost required by compression. The hydrogen generation system is provided with: a pair of electrodes for electrolyzing water, which are disposed at a predetermined depth in water and connected to a power supply; a gas storage chamber which is arranged at the depth of the water, has a communication hole into which the surrounding water can flow, and stores hydrogen gas generated by electrolysis at the cathode of the pair of electrodes; a hydrogen recovery device disposed above the water depth; and a pipe for introducing the hydrogen gas in the gas storage chamber into the hydrogen recovery device.
Description
Technical Field
The present invention relates to the generation of hydrogen.
Background
Hydrogen is in demand as a fuel used for power generation of fuel cells or as an industrial raw material. Hydrogen gas produced by a hydrogen production facility or the like is compressed at the hydrogen production facility or a hydrogen station, stored in a container, and supplied to a fuel consuming apparatus such as a fuel cell vehicle via a dispenser in some cases. Patent document 1 discloses a structure in which hydrogen gas produced by a gas production apparatus is compressed in a compressor, temporarily stored in an accumulator, and then charged into a vehicle via a dispenser.
Patent document 1: japanese patent laid-open publication No. 2017-131862
In general, when storing hydrogen gas as in patent document 1, in order to store a large amount of gas, for example, the hydrogen gas is compressed to a high pressure of 70MPa (megapascals). Therefore, a compressor is required, and there is a problem that the compression cost of hydrogen gas supply is large. In view of this, a technique for generating hydrogen gas that can suppress the cost required for compressing hydrogen gas is desired.
Disclosure of Invention
The present invention can be realized as follows.
(1) According to one embodiment of the present invention, a hydrogen generation system is provided. The hydrogen generation system is provided with: a pair of electrodes for electrolyzing water, which are disposed at a predetermined depth in water and connected to a power supply; a gas storage chamber which is arranged at the depth of the water, has a communication hole into which the surrounding water can flow, and stores hydrogen gas generated by electrolysis at the cathode of the pair of electrodes; a hydrogen recovery device disposed above the water depth; and a pipe for introducing the hydrogen gas in the gas storage chamber into the hydrogen recovery device.
According to the hydrogen generation system of this aspect, hydrogen is generated by electrolysis of water by the pair of electrodes disposed at a predetermined depth in water, and therefore hydrogen at a pressure corresponding to the water pressure of the depth can be generated. Therefore, as compared with a configuration in which hydrogen gas is generated at a position above the water depth, it is possible to generate high-pressure hydrogen gas without using a compressor or other equipment, and it is possible to suppress the cost required for compressing hydrogen gas. Further, the generated hydrogen gas is stored in the gas storage chamber into which the surrounding water flows, so that the hydrogen gas can be stored while maintaining the pressure corresponding to the water pressure of the water depth. Therefore, a large-scale facility to withstand the pressure of hydrogen gas is not required, and the storage cost of hydrogen gas can be suppressed. Therefore, since a storage facility capable of withstanding a high pressure for storing hydrogen gas is not required, the cost required for storing hydrogen gas can be suppressed.
(2) In the hydrogen generation system of the above aspect, the power supply is located above the water depth, and further includes a wiring electrically connecting the power supply and the pair of electrodes; the wiring is disposed along the tube, and at least a part of the wiring is fixed to the tube. According to the hydrogen gas generation system of this aspect, since the wiring electrically connecting the power source and the pair of electrodes is arranged along the pipe that communicates the gas storage chamber with the hydrogen recovery device, and at least a part of the wiring is fixed to the pipe, it is possible to suppress displacement of the wiring and to suppress damage to the wiring due to the displacement, as compared with a configuration in which the wiring is provided without any support in water.
(3) In the hydrogen gas generation system of the above aspect, the gas storage chamber has an outer wall portion that forms an outer contour of the gas storage chamber, and a partition wall portion that protrudes from an upper wall surface of the outer wall portion into the gas storage chamber and divides an upper space in the gas storage chamber into a hydrogen storage portion and an oxygen storage portion, and the cathode of the pair of electrodes is disposed below the hydrogen storage portion; an anode of the pair of electrodes is disposed below the oxygen storage unit; the pipe is communicated with the hydrogen storage part. According to the hydrogen gas generation system of this aspect, the gas storage chamber divides the space above the gas storage chamber into the hydrogen storage portion and the oxygen storage portion, and the cathode is disposed below the hydrogen storage portion, the anode is disposed below the oxygen storage portion, and the pipe communicates with the hydrogen storage portion, so that it is possible to suppress introduction of oxygen gas generated from the anode by electrolysis of water into the hydrogen recovery device through the pipe, and to introduce hydrogen gas of high concentration into the hydrogen recovery device.
The present invention can also be implemented in various ways. For example, the present invention can be realized by a hydrogen storage system, a hydrogen generation method, a hydrogen compression method, a hydrogen storage method, and the like.
Drawings
Fig. 1 is an explanatory diagram showing a schematic configuration of a hydrogen generation system as one embodiment of the present invention.
Fig. 2 is a process diagram showing the steps of the hydrogen generation process.
Detailed Description
A. The implementation mode is as follows:
A1. the system structure is as follows:
fig. 1 is an explanatory diagram showing a schematic configuration of a hydrogen generation system 100 as one embodiment of the present invention. The hydrogen generation system 100 generates hydrogen gas under a pressure corresponding to a water pressure by electrolyzing water in the sea and stores the hydrogen gas. The hydrogen gas generation system 100 includes a pair of electrodes 10, a gas storage chamber 20, a hydrogen recovery device 30, a pipe 40, and a wiring 50.
The pair of electrodes 10 includes a cathode 11 and an anode 12. A pair of electrodes 10 is used for the electrolysis of water. The pair of electrodes 10 is disposed in the vicinity of the bottom B1 of a predetermined water depth D1 and exposed to the surrounding water. In this embodiment, the water depth D1 is about 7000m (meters). The pair of electrodes 10 is disposed in the gas storage chamber 20. Dc power is supplied to the pair of electrodes 10 from a power supply device 510 described later via a wiring 50. As a result, a chemical reaction represented by the following formula (1) occurs at the cathode 11, and hydrogen gas is generated. Further, a chemical reaction represented by the following formula (2) occurs at the anode 12 to generate oxygen.
2H2O+2e－→H2+2OH－···(1)
2OH－→1/2O2+H2O+2e－···(2)
The gas storage chamber 20 is fixedly disposed on the seabed B1. The gas storage chamber 20 stores hydrogen gas generated at the cathode 11 by the current flowing into the cathode 11 of the pair of electrodes 10, in other words, hydrogen gas generated at the cathode 11 by the electrolysis of water. The gas storage chamber 20 has an outer wall portion 21 and a partition wall portion 22. The outer wall portion 21 and the partition wall portion 22 are each formed of a resin having excellent corrosion resistance, for example, Polyethylene (PE). As will be described later, the inside of the gas storage chamber 20 communicates with the outside, and the differential pressure between the internal pressure and the external pressure of the gas storage chamber 20 is small. Therefore, the material of the gas storage chamber 20 does not need to have a durability enough to withstand the water pressure of the water depth D1.
The outer wall portion 21 forms an outer enclosure of the gas storage chamber 20. In the present embodiment, the outer wall portion 21 has a substantially cylindrical lower portion 211 and an upper portion 212 connected to the upper side of the lower portion 211. The upper portion 212 has a hollow conical external shape. In the lower portion 211, near the bottom B1, a plurality of communication holes 26 are formed in parallel and spaced apart from each other by a predetermined distance in the circumferential direction. The communication hole 26 is a through hole penetrating the lower portion 211 in the thickness direction. Therefore, the surrounding seawater flows into the gas storage chamber 20 through the communication hole 26. In other words, the inside of the gas storage chamber 20 communicates with the outside.
The partition wall 22 is formed of a plate-like member that protrudes vertically downward from the upper wall surface 29 of the upper portion 212 toward the inside of the gas storage chamber 20. The partition 22 divides the upper portion inside the gas storage chamber 20 into a pair of gas storage portions 23. The pair of gas storage sections 23 includes a hydrogen storage section 24 and an oxygen storage section 25. The hydrogen reservoir 24 is a storage chamber corresponding to the cathode 11. Specifically, the hydrogen storage unit 24 is located above the cathode 11 and stores hydrogen gas generated in the cathode 11. The oxygen reservoir 25 is a storage chamber corresponding to the anode 12. Specifically, the oxygen storage portion 25 is located above the anode 12 and stores oxygen gas generated in the anode 12.
As described above, since the inside of the gas storage chamber 20 communicates with the surrounding water, the hydrogen gas generated by the chemical reaction of the above formula (1) in the gas storage chamber 20 is hydrogen gas at a pressure of about 70.9MPa (megapascals) corresponding to the water pressure of the water depth D1. Therefore, hydrogen gas of about 70.9MPa (megapascals) is stored in the hydrogen storage 24.
The outer wall 21 of the gas storage chamber 20 has not-shown support portions for fixing the pair of electrodes 10 to positions corresponding to the respective storage portions 24 and 25. The support portion may be configured as a separate member from the outer wall portion 21 and may be disposed on the bottom B1.
An exhaust port 27 is formed in a region corresponding to the oxygen storage portion 25 in the upper portion 212 of the outer wall portion 21. The exhaust port 27 is formed as a through hole penetrating the upper portion 212 in the thickness direction. Therefore, the oxygen storage 25 is configured such that water around the oxygen storage can flow in through the communication hole 26 and the exhaust port 27. The exhaust port 27 exhausts the oxygen gas generated at the anode 12 by the chemical reaction of the above formula (2) and accumulated in the gas storage chamber 20 to the outside of the gas storage chamber 20.
The hydrogen recovery device 30 is mounted on the ship 500, and recovers the hydrogen gas sent through the pipe 40. The hydrogen recovery device 30 includes a shutoff valve 31 and a hydrogen processing unit 32. The shutoff valve 31 is an electromagnetic valve, and opens and closes the pipe 40 based on a control signal from a control device not shown. The hydrogen processing unit 32 processes the hydrogen gas supplied from the gas storage chamber 20 through the pipe 40. Examples of such a process include a hydrogen gas inspection process, a process of filling a hydrogen gas tank, not shown, with hydrogen gas, and the like.
The pipe 40 communicates the inside of the gas storage chamber 20 with the hydrogen recovery device 30, and guides the hydrogen gas in the gas storage chamber 20 to the hydrogen recovery device 30. The majority of the pipe 40 is disposed vertically in the sea. One end of the pipe 40 is fixed to the gas storage chamber 20 by a fixing fitting not shown, and the other end is connected to the shutoff valve 31. The inside of the tube 40 communicates with the hydrogen storage 24. The tube 40 is designed to withstand a differential pressure of internal and external pressures. Specifically, the internal pressure of the pipe 40 is about 70.9MPa in accordance with the pressure of the hydrogen gas in the gas storage chamber 20. On the other hand, the external pressure of the pipe 40 is about 0.1MPa at the minimum on the water surface and about 70.9MPa at the maximum at the portion where the gas storage chamber 20 is provided. Thus, the tube 40 is designed to withstand the maximum differential pressure, i.e., 70.9MPa and 0.1MPa differential pressure (70.8 MPa). In the present embodiment, the tube 40 is formed of an alloy containing nickel and titanium. The pipe 40 may be formed by joining a plurality of partial pipes, for example.
The wiring 50 electrically connects the power supply unit 510 to the pair of electrodes 10. The wiring 50 is disposed along the tube 40 and fixed to the tube 40 at a plurality of positions by fasteners 45. With such a configuration, damage to the wiring 50 due to displacement caused by a current or a wave can be suppressed. The wiring 50 is covered with a covering layer of a material having excellent corrosion resistance, for example, polyethylene. Power supply device 510 is a dc power supply mounted on ship 500.
In a situation where the ship 500 is not in the position shown in fig. 1 and hydrogen gas is not generated by the hydrogen gas generation system 100 (hereinafter, referred to as "hydrogen gas non-generation situation"), the end of the wiring 50 opposite to the side connected to the pair of electrodes 10 is not connected to the power supply device 510. In the hydrogen non-generation state, the end of the pipe 40 opposite to the side connected to the gas storage chamber 20 is not connected to the shutoff valve 31. The end of the wiring 50 to be connected to the power supply unit 510 and the end of the pipe 40 to be connected to the shut-off valve 31 are fixed to each other by the fastener 45 in the hydrogen non-generation condition, and are fixed to a floating body floating on the sea surface.
A2. Hydrogen generation treatment:
fig. 2 is a process chart showing the steps of the hydrogen generation process. The hydrogen generation process is performed in order to generate high-pressure hydrogen of about 70.9 MPa.
The pair of electrodes 10 connected to the power supply are disposed at a predetermined water depth D1 so as to be exposed to the surrounding water (step P105). This process P105 includes a plurality of processes. Specifically, the method includes a step of disposing the gas storage chamber 20 and the pair of electrodes 10 on the seabed B1; a step of connecting the tube 40 to the gas storage chamber 20; a step of arranging the wiring 50 along the tube 40 and fixing the wiring 50 to the tube 40 by a plurality of fasteners 45; a step of attaching the end of the pipe 40 on the sea side and the end of the wiring 50 on the sea side to a buoy not shown; a step of disposing the ship 500 on which the power supply device 510 and the hydrogen recovery device 30 are mounted at a position above the gas storage chamber 20; connecting the end of the wiring 50 attached to the float to the power supply unit 510; and a step of connecting the end of the pipe 40 attached to the float to the stop valve 31. Among these steps, a plurality of steps can be performed by using a submarine having a working arm, for example.
By flowing an electric current to the pair of electrodes 10, hydrogen gas is generated from the cathode 11 (step P110). The hydrogen gas generated in the step P110 is stored in the gas storage chamber 20, more specifically, in the hydrogen storage unit 24 (step P115). The hydrogen gas stored in the gas storage chamber 20 is introduced into the hydrogen recovery device 30 using the pipe 40 (step P120). In this way, hydrogen gas of about 70.9MPa generated in the cathode 11 of the pair of electrodes 10 disposed at the water depth D1 was stored in the gas storage chamber 20 and introduced into the hydrogen treatment unit 32 through the pipe 40.
According to the hydrogen generation system 100 of the embodiment described above, hydrogen is generated by electrolysis of water by the pair of electrodes 10 disposed at the predetermined water depth D1 in the sea, and therefore hydrogen having a water pressure of the water depth D1, that is, a pressure of about 70.9MPa can be generated. Therefore, as compared with the configuration in which hydrogen gas is generated above the water depth D1, it is possible to generate high-pressure hydrogen gas without using a compressor or other equipment, and it is possible to suppress the cost required for compressing hydrogen gas. Further, the generated hydrogen gas is stored in the gas storage chamber 20 into which the surrounding water flows, so that the hydrogen gas can be stored while maintaining the pressure corresponding to the water pressure of the water depth. Therefore, a large-scale facility to withstand the pressure of hydrogen gas is not required, and the storage cost of hydrogen gas can be suppressed. Therefore, since a storage facility capable of withstanding a high pressure for storing hydrogen gas is not required, the cost required for storing hydrogen gas can be suppressed.
Further, since the wiring 50 electrically connecting the power supply device 510 and the pair of electrodes 10 is disposed along the pipe 40 that communicates the inside of the gas storage chamber 20 and the hydrogen recovery device 30, and is fixed to the pipe 40 at a plurality of positions, it is possible to suppress displacement due to a tidal current or waves and to suppress damage to the wiring 50, compared to a configuration in which the wiring 50 is provided without any support in the sea.
Further, since the gas storage chamber 20 divides the upper space in the gas storage chamber 20 into the hydrogen storage unit 24 and the oxygen storage unit 25, the cathode 11 is disposed below the hydrogen storage unit 24, the anode 12 is disposed below the oxygen storage unit 25, and the pipe 40 communicates with the hydrogen storage unit 24, it is possible to suppress introduction of oxygen gas generated from the anode 12 by electrolysis of water into the hydrogen recovery device 30 via the pipe 40, and to introduce high-concentration hydrogen gas into the hydrogen recovery device 30.
B. Other embodiments are as follows:
B1. other embodiment mode 1:
in the above embodiment, the power supply device 510 is mounted on the ship 500, but the present disclosure is not limited thereto. For example, it may be carried on a drilling tool or platform for drilling crude oil from a subsea field, or a dedicated drilling tool or platform for hydrogen production. For example, the power supply device 510 may be disposed on a land. In such a configuration, the wiring connecting the power supply device 510 and the pair of electrodes 10 may be disposed at a position close to the land along the seabed B1, and may be disposed vertically near the position where the power supply device 510 is disposed and connected to the power supply device 510. Further, for example, the power supply device 510 may be placed in the sea. In such a configuration, the power supply device 510 may be configured by a secondary battery or the like, and the charged power supply device 510 may be disposed on the seabed B1. In such a configuration, the power supply device 510 may be configured as a submarine including a propeller and a rudder, and when the amount of stored electric power is equal to or less than a predetermined threshold value, the power supply device 510 may be floated to the sea. Then, the charged power supply device 510 may be sunk to the vicinity of the gas storage chamber 20.
B2. Other embodiment mode 2:
in the above embodiment, the partition wall 22 may be omitted. In such a configuration, the exhaust port 27 may be omitted. In such a configuration, both the hydrogen gas and the oxygen gas are stored in the gas storage chamber 20. However, since hydrogen gas has a lower specific gravity than oxygen gas, hydrogen gas is stored in the upper portion inside the gas storage chamber 20. In addition, the pipe 40 is connected to the upper portion 212 in the gas storage chamber 20. Therefore, even in such a configuration, the hydrogen gas stored in the gas storage chamber 20 can be introduced into the hydrogen recovery device 30 through the pipe 40 in preference to the oxygen gas.
B3. Other embodiment 3:
in the above embodiment, hydrogen gas is generated by electrolysis of water, but hydrogen gas may be generated by other methods. For example, a heat-insulating container provided with an exhaust port opened under the water pressure of the water depth D1 may be filled with liquid hydrogen, and such a heat-insulating container may be dropped from the ship 500 to the gas storage room 20 to be settled. In such a configuration, a member for guiding the heat insulating container to the inside of the gas storage chamber 20 may be prepared in advance. In such a configuration, when the thermal insulation container reaches the seabed B1, the exhaust port of the settled thermal insulation container is opened. At this time, the liquid hydrogen filled in the heat insulating container is rapidly vaporized to generate hydrogen gas, and the hydrogen gas is discharged to the outside of the heat insulating container. In the structure in which the heat insulating container is guided into the gas storage chamber 20, hydrogen gas discharged from the heat insulating container is stored in the gas storage chamber 20. As the heat insulating container, for example, a container having a double-layer structure formed of a material capable of withstanding a pressure (differential pressure) of about 70.9MPa can be used. The external shape of such a container may be a substantially spherical external shape. According to such a structure, the heat insulating container can withstand higher pressure. Further, the exhaust port to be opened by the water pressure of the water depth D1 may be configured to be an exhaust port provided with a valve device having a valve body and a spring member for pressing the valve body from the inside toward the outside of the heat insulating container, for example. In such a configuration, by setting the biasing force of the spring member to be smaller than the water pressure at the water depth D1, the exhaust port can be opened under the water pressure at the water depth D1.
B4. Other embodiment mode 4:
in the above embodiment, the gas storage chamber 20 is fixedly installed on the seabed B1, but instead, the gas storage chamber 20 may be a mobile room. Specifically, the gas storage chamber 20 may be loaded on the ship 500 at a normal time, and the gas storage chamber 20 may be thrown into the sea from the ship 500 and may be lowered to the vicinity of the seabed B1 in the step P105 of the hydrogen generation process. At this time, the gas storage chamber 20 can be lowered by using the pipe 40 as a guide member. For example, a through hole may be formed in the upper portion 212 separately from the exhaust port 27, and the pipe 40 may be inserted into the through hole, and the gas storage chamber 20 may be lowered while being guided by the pipe 40 in this state. In this structure, the end of the tube 40 may be formed in a large flange shape so that the tube 40 does not come off the through hole in a state where the gas storage chamber 20 is settled to the bottom. In such a configuration, the pair of electrodes 10 may be fixed to the gas storage chamber 20 in advance and may be sunk together with the gas storage chamber 20.
B5. Other embodiment 5:
in each embodiment, the gas storage chamber 20 is disposed on the sea floor at a water depth of 7000m, but the present disclosure is not limited thereto. For example, the water depth may be set to any water depth within a range of 10m to 8000 m. More preferably, the water depth of the water treatment apparatus can be set to any water depth within the range of 100m to 7000 m. In this configuration, the location of the water depth may not be the sea floor. Further, the present invention is not limited to the sea, and may be disposed in any water environment such as a lake or a marsh.
B6. Other embodiment 6:
the configuration of the hydrogen generation system 100 in the above embodiment is merely an example, and various modifications can be made. For example, only the exhaust port 27 may be omitted without omitting the partition wall 22. Further, the hydrogen recovery device 30 is mounted on the ship 500, but may be disposed on land or in the sea instead. In the configuration in which the hydrogen recovery device 30 is disposed in the sea, by being disposed at a position above the water depth at which the pair of electrodes 10 is disposed, it is possible to recover hydrogen gas at a higher pressure than in the configuration in which hydrogen gas is generated at such a water depth. In the above embodiment, the outer wall portion 21 and the partition wall portion 22 are formed of polyethylene, but may be formed of any other material such as any other kind of resin, metal, and ceramic instead of polyethylene. Further, the hydrogen recovery device 30 may be configured to include a compressor. In such a configuration, for example, when the gas storage chamber 20 is disposed at a position shallower than the water depth of 7000m, the hydrogen gas having a pressure lower than 70.9MPa can be further compressed to 70.9MPa using the compressor. In such a configuration, compared to a configuration in which hydrogen gas having a pressure lower than the pressure of the water depth is compressed to 70.9MPa, for example, a part of a plurality of compressors for performing multistage compression can be omitted, or electric power required for compression can be suppressed. In the above embodiment, the step P120 may be omitted. That is, the recovery process may be omitted from the hydrogen gas generation process, and the recovery process may be performed as another process. In the above embodiment, the hydrogen recovery device 30 may be provided with a pump for actively feeding the hydrogen gas in the gas storage chamber 20 to the hydrogen treatment unit 32 via the pipe 40. In the above embodiment, the entire wiring 50 in the sea water may be fixed to the pipe 40.
The present invention is not limited to the above-described embodiments, and can be realized in various configurations without departing from the spirit thereof. For example, features of the techniques in the embodiments corresponding to technical features in the respective aspects described in the section of summary of the invention may be appropriately replaced or combined in order to solve a part or all of the above-described problems or to achieve a part or all of the above-described effects. Note that, if this technical feature is not described as an essential structure in the present specification, it can be appropriately deleted.
Description of the reference numerals
10 … pairs of electrodes, 11 … cathode, 12 … anode, 20 … gas storage chamber, 21 … outer wall, 22 … partition, 23 … pairs of gas storage section, 24 … hydrogen storage section, 25 … oxygen storage section, 26 … opening, 27 … exhaust port, 29 … upper wall, 30 … hydrogen recovery device, 31 … stop valve, 32 … hydrogen treatment section, 40 … pipe, 45 … fastener, 50 … wiring, 100 … hydrogen generation system, 211 … lower section, 212 … upper section, 500 … ship, 510 … power supply unit, B1 … seabed, D1 … water depth.
Claims (4)
1. A hydrogen generation system is provided with:
a pair of electrodes for electrolyzing water, which are disposed at a predetermined depth in water and connected to a power supply;
a gas storage chamber which is arranged at the depth of the water, has a communication hole into which the surrounding water can flow, and stores hydrogen gas generated by electrolysis at the cathode of the pair of electrodes;
a hydrogen recovery device disposed above the water depth; and
a pipe for introducing the hydrogen gas in the gas storage chamber into the hydrogen recovery device.
2. The hydrogen generating system according to claim 1,
the power supply is located above the water depth,
the hydrogen generation system further includes a wiring for electrically connecting the power supply to the pair of electrodes,
the wiring is disposed along the tube, and at least a part of the wiring is fixed to the tube.
3. The hydrogen generation system according to claim 1 or 2,
the gas storage chamber has an outer wall portion that forms an outer contour of the gas storage chamber, and a partition wall portion that protrudes from an upper wall surface of the outer wall portion into the gas storage chamber and divides an upper space in the gas storage chamber into a hydrogen storage portion and an oxygen storage portion,
the cathode of the pair of electrodes is disposed below the hydrogen storage unit,
the anode of the pair of electrodes is disposed below the oxygen storage part,
the pipe is communicated with the hydrogen storage part.
4. A method for generating hydrogen gas, comprising:
disposing a pair of electrodes for electrolysis of water connected to a power supply at a predetermined depth of water in the water so as to be exposed to the surrounding water;
a step of generating hydrogen gas from a cathode of the pair of electrodes by flowing a current to the pair of electrodes;
a step of storing the generated hydrogen gas in a gas storage chamber disposed at the water depth and communicating with surrounding water; and
and introducing the hydrogen gas stored in the gas storage chamber into the hydrogen recovery device through a pipe connecting the hydrogen recovery device disposed above the water level and the gas storage chamber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-129920 | 2018-07-09 | ||
| JP2018129920A JP7067325B2 (en) | 2018-07-09 | 2018-07-09 | Hydrogen gas generation system and hydrogen gas generation method |
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| CN110699699A true CN110699699A (en) | 2020-01-17 |
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| US (1) | US20200010963A1 (en) |
| JP (1) | JP7067325B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114935106A (en) * | 2022-05-24 | 2022-08-23 | 苏州西热节能环保技术有限公司 | Deep sea compressed hydrogen structure |
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| JP2020003005A (en) * | 2018-06-28 | 2020-01-09 | トヨタ自動車株式会社 | Hydrogen gas compression system and hydrogen gas compression method |
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| CN114935106A (en) * | 2022-05-24 | 2022-08-23 | 苏州西热节能环保技术有限公司 | Deep sea compressed hydrogen structure |
| CN114935106B (en) * | 2022-05-24 | 2024-04-05 | 苏州西热节能环保技术有限公司 | Deep sea compressed hydrogen structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020007187A (en) | 2020-01-16 |
| US20200010963A1 (en) | 2020-01-09 |
| JP7067325B2 (en) | 2022-05-16 |
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