WO2023189948A1 - 機器のメンテナンス方法 - Google Patents
機器のメンテナンス方法 Download PDFInfo
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- WO2023189948A1 WO2023189948A1 PCT/JP2023/011248 JP2023011248W WO2023189948A1 WO 2023189948 A1 WO2023189948 A1 WO 2023189948A1 JP 2023011248 W JP2023011248 W JP 2023011248W WO 2023189948 A1 WO2023189948 A1 WO 2023189948A1
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- valve
- hydrogen
- flow path
- gas
- hydrogen gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0323—Valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/012—Hydrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/014—Nitrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
- F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
- F17C2223/033—Small pressure, e.g. for liquefied gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/04—Methods for emptying or filling
- F17C2227/044—Methods for emptying or filling by purging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/04—Indicating or measuring of parameters as input values
- F17C2250/0404—Parameters indicated or measured
- F17C2250/043—Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/04—Indicating or measuring of parameters as input values
- F17C2250/0404—Parameters indicated or measured
- F17C2250/0439—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/01—Improving mechanical properties or manufacturing
- F17C2260/015—Facilitating maintenance
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/03—Dealing with losses
- F17C2260/031—Dealing with losses due to heat transfer
- F17C2260/032—Avoiding freezing or defrosting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/01—Applications for fluid transport or storage
- F17C2270/0134—Applications for fluid transport or storage placed above the ground
- F17C2270/0136—Terminals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/01—Applications for fluid transport or storage
- F17C2270/0165—Applications for fluid transport or storage on the road
- F17C2270/0168—Applications for fluid transport or storage on the road by vehicles
- F17C2270/0171—Trucks
Definitions
- the present disclosure relates to a maintenance method for equipment that handles liquefied hydrogen.
- Patent Document 1 discloses a method for shipping LNG from an LNG receiving base tank and an apparatus therefor.
- a lorry is connected to an LNG receiving terminal via a flexible hose.
- the LNG remaining in the flexible hose is purged by flowing nitrogen gas from the nitrogen gas supply equipment into the flexible hose, and the lorry is transferred to the LNG receiving terminal.
- nitrogen gas is used to purge the lorry when it is separated from the LNG receiving terminal, but if such a purge technology is applied to equipment that handles liquefied hydrogen, Nitrogen may solidify due to the cold heat of hydrogen.
- An object of the present disclosure is to provide a method for maintaining equipment that can prevent nitrogen gas from solidifying when separating the equipment from a liquefied hydrogen flow path.
- a method for maintaining equipment includes a first valve, a second valve, an equipment, a third valve, and a fourth valve, which are arranged in order along the direction in which liquefied hydrogen flows.
- a method for maintaining equipment in a flow path comprising: filling hydrogen gas between the first valve and the fourth valve in the flow path; and filling the space between the first valve and the fourth valve in the flow path.
- FIG. 1 is an overall schematic diagram of a liquefied hydrogen system that is the subject of the present disclosure.
- FIG. 2 is an enlarged schematic diagram of a liquefied hydrogen system according to an embodiment of the present disclosure, showing how liquefied hydrogen flows through a flow path.
- FIG. 3 is a flowchart of a method for maintaining equipment according to an embodiment of the present disclosure.
- FIG. 4 is an enlarged schematic diagram of a liquefied hydrogen system according to an embodiment of the present disclosure, showing a state in which a part of the flow path is replaced with hydrogen gas.
- FIG. 5 is an enlarged schematic diagram of a liquefied hydrogen system according to an embodiment of the present disclosure, showing a state in which a part of the flow path is further replaced with nitrogen gas.
- FIG. 1 is an overall schematic diagram of a liquefied hydrogen system that is the subject of the present disclosure.
- FIG. 2 is an enlarged schematic diagram of a liquefied hydrogen system according to an embodiment of the present disclosure, showing how lique
- FIG. 6 is an enlarged schematic diagram of a liquefied hydrogen system according to an embodiment of the present disclosure, showing a state in which equipment is separated from a flow path.
- FIG. 7 is an enlarged schematic diagram of the liquefied hydrogen system according to the first modified embodiment of the present disclosure, showing a state in which a part of the flow path is replaced with hydrogen gas and nitrogen gas.
- FIG. 8 is an enlarged schematic diagram of a liquefied hydrogen system according to a second modified embodiment of the present disclosure, showing a state in which a part of the flow path is replaced with hydrogen gas and nitrogen gas.
- the equipment according to the present disclosure is a member or device that handles liquefied hydrogen.
- the following embodiment will be described based on an example in which a pump is used as the device.
- FIG. 1 is an overall schematic diagram of a liquefied hydrogen system 1S that is the subject of the present disclosure.
- the liquefied hydrogen system 1S includes a liquefied hydrogen tank 100, hydrogen usage equipment 101, and a plurality of pumps 50.
- the liquefied hydrogen tank 100, the hydrogen usage equipment 101, and the plurality of pumps 50 are connected by a flow path LS.
- the liquefied hydrogen tank 100 is a tank that can store liquefied hydrogen, and is located on land.
- the liquefied hydrogen tank 100 is a ground-mounted flat bottom tank.
- the hydrogen usage equipment 101 is equipment that uses liquefied hydrogen stored in the liquefied hydrogen tank 100.
- the hydrogen usage equipment 101 includes a lorry that transports liquefied hydrogen.
- the plurality of pumps 50 have a function of sending out liquefied hydrogen stored in the liquefied hydrogen tank 100 to the hydrogen usage equipment 101. Note that, as shown in FIG. 1, in this embodiment, a plurality of pumps 50 are arranged in parallel.
- the liquefied hydrogen system 1S further includes two attachment/detachment mechanisms 1. Each attachment/detachment mechanism 1 separates a portion including the pump 50 from the flow path LS during maintenance of the pump 50.
- FIG. 2 is an enlarged schematic diagram of the liquefied hydrogen system 1S according to the present embodiment, and is a diagram showing how liquefied hydrogen flows through the flow path LS.
- the attachment/detachment mechanism 1 includes a first valve 91, a second valve 92, a third valve 93, and a fourth valve 94.
- the first valve 91, the second valve 92, the third valve 93, and the fourth valve 94 are arranged in this order from the liquefied hydrogen tank 100 side. Each valve opens and closes a part of the flow path LS.
- the pump 50 described above is arranged between the second valve 92 and the third valve 93.
- the part between the first valve 91 and the second valve 92 is called a first part LS1
- the part between the second valve 92 and the pump 50 is called a second part LS2
- the part between the pump 50 and the third valve 93 is called a third part LS3
- the part between the third valve 93 and the fourth valve 94 is called a fourth part LS4.
- the attachment/detachment mechanism 1 further includes a hydrogen supply/discharge section 70 , a hydrogen supply/discharge section 71 , a nitrogen supply section 80 , and a nitrogen discharge section 81 .
- Each supply/discharge unit supplies gas to the flow path LS and discharges gas from the flow path LS.
- the hydrogen supply/discharge unit 70 communicates with the first portion LS1 and supplies hydrogen gas to the flow path LS. Further, the hydrogen supply/discharge unit 70 discharges hydrogen gas from the first portion LS1.
- the hydrogen supply/discharge unit 70 includes a hydrogen gas tank 70A, a flow path 70B, and a hydrogen valve 70C.
- the hydrogen gas tank 70A stores hydrogen gas.
- the flow path 70B communicates the hydrogen gas tank 70A and the first portion LS1.
- the hydrogen valve 70C opens and closes the flow path 70B.
- the hydrogen supply/discharge unit 71 communicates with the fourth portion LS4 and supplies hydrogen gas to the flow path LS. Further, the hydrogen supply/discharge unit 71 discharges hydrogen gas from the fourth portion LS4.
- the hydrogen supply/discharge unit 71 includes a hydrogen gas tank 71A, a flow path 71B, and a hydrogen valve 71C. The structure and function of these members are similar to each member of the hydrogen supply/discharge section 70.
- the nitrogen supply section 80 communicates with the second portion LS2 of the flow path LS.
- the nitrogen supply unit 80 directly communicates with the second portion LS2 without passing through the first portion LS1, and supplies nitrogen gas to the flow path LS.
- the nitrogen supply unit 80 includes a nitrogen gas tank 80A, a flow path 80B, and a nitrogen valve 80C.
- the nitrogen gas tank 80A stores nitrogen gas.
- the flow path 80B communicates the nitrogen gas tank 80A and the second portion LS2.
- the nitrogen valve 80C opens and closes the flow path 80B.
- the nitrogen discharge part 81 communicates with the third portion LS3 of the flow path LS and discharges nitrogen gas from the flow path LS.
- the nitrogen discharge section 81 includes a nitrogen gas tank 81A, a flow path 81B, and a nitrogen valve 81C.
- the nitrogen gas tank 81A stores nitrogen gas.
- the flow path 81B communicates the nitrogen gas tank 81A and the third portion LS3.
- the nitrogen valve 81C opens and closes the flow path 81B.
- the attachment/detachment mechanism 1 further includes a pressure gauge 61, a thermometer 62, a pressure gauge 63, and a thermometer 64.
- the pressure gauge 61 detects the pressure of the first portion LS1
- the thermometer 62 detects the temperature of the first portion LS1.
- the pressure gauge 63 detects the pressure of the fourth portion LS4, and the thermometer 64 detects the temperature of the fourth portion LS4.
- the attachment/detachment mechanism 1 further includes a first joint part LT1 and a second joint part LT.
- the pump 50 can be attached to and detached from the flow path LS by the first joint part LT1 and the second joint part LT2.
- the first joint part LT1 and the second joint part LT2 have a bayonet joint structure. Note that any joint structure such as a flange joint can be adopted as the first joint part LT1 and the second joint part LT2.
- FIG. 3 is a flowchart of a method for maintaining the pump 50.
- FIG. 4 is an enlarged schematic diagram of the liquefied hydrogen system 1S according to the present embodiment, showing a state in which a part of the flow path LS has been replaced with hydrogen gas.
- FIG. 5 is a diagram showing a state in which a part of the flow path LS is further replaced with nitrogen gas.
- FIG. 6 is a diagram showing a state in which the pump 50 is separated from the flow path LS. In each figure, a state where a valve is painted white means that the valve is open, and a state where the valve is painted black means that the valve is closed.
- step S01 of FIGS. 2 and 3 when the pump 50 is in an operable state, the first valve 91, the second valve 92, the third valve 93, and the fourth valve 94 are all open, and the hydrogen Valve 70C, nitrogen valve 80C, nitrogen valve 81C, and hydrogen valve 71C are all closed. In this state, the pump 50 is operated, so that liquefied hydrogen flows through the channel LS.
- step S03 of FIG. 3 and FIG. 92 and third valve 93 are respectively closed.
- the first portion LS1 and the fourth portion LS4 are each filled with hydrogen gas at room temperature.
- the operator opens the nitrogen valve 80C and the nitrogen valve 81C, respectively.
- nitrogen gas flows into the second portion LS2 and third portion LS3 from the nitrogen supply portion 80, and hydrogen gas is discharged from the second portion LS2 and third portion LS3 to the nitrogen discharge portion 81. That is, the hydrogen gas in the second portion LS2 and the third portion LS3 is replaced with nitrogen gas.
- the operator closes the nitrogen valve 80C and the nitrogen valve 81C.
- the operator opens the first joint part LT1 and the second joint part LT2. and remove the pump 50 from the flow path LS.
- the second portion LS2 and the third portion LS3 are sealed in a state filled with nitrogen gas.
- an operator can perform maintenance on the pump 50.
- the operator reconnects the pump 50 to the flow path LS at the first joint part LT1 and the second joint part LT2. Thereafter, the operator performs the reverse process to the above-mentioned removal process. Specifically, the operator replaces the pump 50, the second valve 92, and the third valve 93 with nitrogen gas so that air and hydrogen gas do not mix. Specifically, the operator closes the second valve 92 and the third valve 93, opens the nitrogen valve 80C and the nitrogen valve 81C, and supplies nitrogen gas to the pump 50, the second part LS2, and the third part LS3. The air is replaced with nitrogen gas.
- the operator opens the second valve 92 and the third valve 93 to cause hydrogen gas to flow into the second portion LS2 and the third portion LS3 again.
- the operator opens the first valve 91 and the fourth valve 94 to cause liquefied hydrogen to flow into the first portion LS1, second portion LS2, third portion LS3, and fourth portion LS4.
- the pump 50 can be restarted. Note that the opening and closing of each valve during the removal and installation of the pump 50 described above may be performed automatically.
- the first valve 91, the second valve 92, the first joint part LT1, the pump 50, the second joint part LT2, the third valve 93, and the fourth valve 94 are arranged in this order.
- the operator places hydrogen into the first portion LS1, second portion LS2, third portion LS3, and fourth portion LS4 while the flow path LS is filled with liquefied hydrogen. Gas is introduced and liquefied hydrogen is discharged.
- the operator causes nitrogen gas to flow into the second part LS2 and third part LS3 while hydrogen gas flows into the first part LS1, second part LS2, third part LS3, and fourth part LS4. , emit hydrogen gas.
- the operator divides and seals the flow path LS with the first joint portion LT1 and the second joint portion LT2, and separates the pump 50. do.
- the pump 50 can be safely removed from the flow path LS while the pump 50 is replaced with nitrogen gas. Since the melting point of nitrogen gas is -210°C, it tends to solidify when exposed to the cold heat of liquefied hydrogen at -253°C. However, in the present embodiment, even when liquefied hydrogen is filled on the liquefied hydrogen tank 100 side from the first valve 91 and on the hydrogen usage equipment 101 side from the fourth valve 94, the first portion LS1 and the fourth portion LS4 Since each is filled with hydrogen gas, it is possible to prevent the cold heat of the liquefied hydrogen at about -253° C. from being transmitted to the nitrogen gas in the second portion LS2 and the third portion LS3.
- the first portion LS1 and the fourth portion LS4 can each function as a temperature buffer.
- the pump 50 can be removed from the flow path LS for the purpose of maintenance or the like by using nitrogen gas, which is cheaper than helium, which is generally used as an inert gas. Therefore, maintenance of the pump 50 can be performed without being affected by the amount of helium gas supplied. As a result, maintenance costs for the liquefied hydrogen system 1S can also be reduced. Further, after maintenance, the operation of the pump 50 can be promptly restarted by flowing liquefied hydrogen again into a limited area from the first valve 91 to the fourth valve 94.
- the operator when the operator fills the space between the first valve 91 and the fourth valve 94 of the flow path LS with hydrogen gas, the operator closes the first valve 91 and the fourth valve 94, respectively.
- the operator by introducing hydrogen gas between the first valve 91 and the fourth valve 94, liquefied hydrogen is discharged. Therefore, filling the hydrogen gas and discharging the liquefied hydrogen can be efficiently performed while pushing out the liquefied hydrogen using the hydrogen gas.
- the operator when filling nitrogen gas between the second valve 92 and the third valve 93 of the flow path LS, the operator closes the second valve 92 and the third valve 93, respectively, and then closes the second valve 92 and the third valve 93.
- nitrogen gas between 92 and third valve 93 hydrogen gas is discharged. In this case as well, filling the nitrogen gas and discharging the hydrogen gas can be performed efficiently while pushing out the hydrogen gas with the nitrogen gas.
- the nitrogen supply unit 80 for supplying nitrogen gas to the second portion LS2 and the third portion LS3 is directly connected to the second portion LS2 of the flow path LS. Therefore, compared to the case where nitrogen gas is supplied to the second part LS2 and third part LS3 via the first part LS1 and fourth part LS4, nitrogen gas is supplied to the first part LS1 and fourth part LS4. There is no residual nitrogen gas, and solidification of the residual nitrogen gas can be prevented. Further, with such a configuration, it is possible to prevent hydrogen gas from leaking into the atmosphere from the first portion LS1 and the fourth portion LS4 serving as the temperature buffer, and to prevent air from entering the temperature buffer.
- the operator adjusts the opening and closing of the hydrogen valve 70C according to the detection results of the pressure gauge 61 and the thermometer 62, The filling amount of hydrogen gas in the first portion LS1 can be adjusted.
- the operator adjusts the opening/closing of the hydrogen valve 70C according to the detection results of the pressure gauge 63 and the thermometer 64, and controls the hydrogen gas in the fourth portion LS4. Gas filling amount can be adjusted. In each of the above adjustment operations, the operator may adjust the filling amount of hydrogen gas according to the detection result of one of temperature and pressure.
- the hydrogen gas contracts due to the propagation of the cold heat of the liquefied hydrogen, and the pressure tends to decrease. If the pressure in the first part LS1 is left as it is, the pressure difference between the first part LS1 and the second part LS2 causes nitrogen gas to flow into the first part LS1 through the second valve 92 and liquefy. There is a possibility that it will solidify within the first portion LS1 due to the cold heat of hydrogen. In this embodiment, in order to prevent such a problem, when the pressure in the first portion LS1 decreases, the operator supplies hydrogen gas from the hydrogen supply/discharge unit 70 to maintain the pressure in the first portion LS1. Can be done.
- the temperature of the first portion LS1 drops significantly, there is a possibility that nitrogen will liquefy and solidify between the second valve 92 and the first joint portion LT1.
- nitrogen gas is liquefied in this way, hydrogen gas may leak from the first portion LS1 to the second portion LS2 due to the generation of negative pressure.
- the hydrogen gas leaking into the second portion LS2 is re-vaporized by heat input from the atmosphere, its pressure increases, and there is a possibility that the hydrogen gas may further leak into the atmosphere.
- the operator when the temperature of the first portion LS1 decreases, the operator repeatedly supplies and discharges hydrogen gas by operating the hydrogen supply/discharge unit 70 to raise the temperature of the first portion LS1. can be done.
- the operator increases the temperature of the first part LS1 by increasing the amount of hydrogen gas supplied to the first part LS1, and when the pressure increases accordingly, the operator removes the hydrogen gas from the first part LS1.
- the pressure in the first portion LS1 can be adjusted by slightly discharging it. Note that each measuring device such as the pressure gauge 61 and the thermometer 62 is not essential in the present disclosure. Further, the above adjustment work may be performed automatically.
- the pump 50 when the pump 50 is separated from the flow path LS as a device that handles liquefied hydrogen as in this embodiment, maintenance thereof may require several days. Even in such a case, in this embodiment, as shown in FIG. 1, since the pumps 50 are arranged in parallel, the transfer of liquefied hydrogen can be continued by operating the other pump during maintenance of one pump. be able to. Further, as described above, even if the pump 50 is separated from the flow path LS for a long period of time, the operator can adjust the amount of hydrogen gas filled in the first part LS1 and the fourth part LS4. Therefore, even during long-term maintenance, it is possible to stably prevent cold heat from being transferred to the nitrogen gas in the second portion LS2 and the third portion LS3.
- the valves and the like are arranged in order along the direction in which the liquefied hydrogen flows from the liquefied hydrogen tank 100 toward the hydrogen usage equipment 101.
- the direction in which the liquefied hydrogen flows is The direction may be from the equipment 101 in use to the liquefied hydrogen tank 100.
- the first valve 91, the second valve 92, the first joint part LT1, the pump 50, the second joint part LT2, the third valve 93, and the fourth valve 94 may be arranged in order.
- hydrogen gas and nitrogen gas are respectively flowed from the second valve 92 side to the third valve 93 side through the pump 50, but the present disclosure is not limited thereto.
- the attachment/detachment mechanism 1 may have its own hydrogen gas and nitrogen gas supply and discharge passages on both sides of the pump 50.
- FIG. 7 is an enlarged schematic diagram of the liquefied hydrogen system according to the first modified embodiment of the present disclosure, and is a diagram showing a state in which a portion of the flow path LS is replaced with hydrogen gas and nitrogen gas, respectively. .
- This modified embodiment is different from the previous embodiment in the supply route of nitrogen gas to the flow path LS, and therefore, the description will focus on this difference.
- the liquefied hydrogen system 1S includes a seal gas flow path 51 and a valve 52 instead of the nitrogen supply section 80 and nitrogen discharge section 81 according to the previous embodiment.
- the seal gas passage 51 supplies a seal gas made of nitrogen to a gap within the pump 50 in order to prevent liquefied hydrogen from leaking within the pump 50 .
- the operator can supply the above nitrogen gas to the flow path LS by switching the opening and closing of the valve 52.
- the operator closes the second valve 92 and the third valve 93 with hydrogen gas filled between the first valve 91 and the fourth valve 94.
- nitrogen gas flows from the pump 50 into the flow path between the second valve 92 and the third valve 93.
- hydrogen gas is discharged from a discharge passage (not shown).
- the operator can separate the flow path LS at the first joint part LT1 and the second joint part LT2 and remove the pump 50. Even in such a configuration, the pump 50 can be safely removed from the flow path LS while preventing the nitrogen gas from solidifying.
- the nitrogen gas supply source in the present disclosure may be the pump 50.
- FIG. 8 is an enlarged schematic diagram of a liquefied hydrogen system according to a second modified embodiment of the present disclosure, showing a state in which a part of the flow path LS is replaced with hydrogen gas and nitrogen gas.
- the hydrogen supply/discharge part 70 communicating with the first part LS1 and the hydrogen supply/discharge part 71 communicating with the fourth part LS4 each supply and discharge hydrogen gas through one passage.
- the hydrogen gas supply passage and the discharge passage may be provided independently.
- the attachment/detachment mechanism 1 includes a hydrogen supply section 75 and an adjustment hydrogen discharge section 76.
- the hydrogen supply unit 75 has a function of supplying hydrogen gas to a portion between the first valve 91 and the fourth valve 94. Further, the hydrogen supply unit 75 has a function of adjusting the amount of hydrogen gas filled in the first portion LS1 by supplying hydrogen gas to the first portion LS1 after the second valve 92 is closed. Further, the adjusting hydrogen discharge section 76 has a function of adjusting the amount of hydrogen gas filled in the first portion LS1 by discharging hydrogen gas from the first portion LS1 after the second valve 92 is closed.
- the attachment/detachment mechanism 1 includes an adjustment hydrogen supply section 85 and a hydrogen discharge section 86.
- the hydrogen discharge section 86 has a function of receiving liquefied hydrogen and hydrogen gas from a portion between the first valve 91 and the fourth valve 94. Further, the hydrogen discharge section 86 has a function of adjusting the amount of hydrogen filled in the fourth portion LS4 by receiving hydrogen gas from the fourth portion LS4 after the third valve 93 is closed. Further, the adjustment hydrogen supply unit 85 has a function of adjusting the amount of hydrogen gas filled in the fourth portion LS4 by supplying hydrogen gas to the fourth portion LS4 after the third valve 93 is closed.
- the operator can determine the amount of hydrogen gas supplied from the hydrogen supply section 75 and the amount of hydrogen gas discharged from the adjustment hydrogen discharge section 76 according to the detection results of the pressure gauge 61 and the thermometer 62.
- the amount of hydrogen gas discharged can be adjusted.
- the amount of hydrogen gas supplied from the adjustment hydrogen supply section 85 and the amount of hydrogen gas discharged from the hydrogen discharge section 86 can be adjusted according to the detection results of the pressure gauge 63 and the thermometer 64. can.
- a device maintenance method includes a first valve, a second valve, a device, a third valve, and a fourth valve, which are arranged in order along the direction in which liquefied hydrogen flows.
- a method for maintaining equipment in a flow path comprising: filling hydrogen gas between the first valve and the fourth valve of the flow path; filling a space between the second valve and the third valve of the flow path with nitrogen gas from a state in which the hydrogen gas is filled between the valve and the second valve of the flow path; The flow paths between the second valve and the device and between the third valve and the device are separated and sealed, respectively, with the nitrogen gas filled between the third valve and the third valve. , separating the device from the flow path.
- the method when filling the hydrogen gas between the first valve and the fourth valve of the flow path, the first valve and the fourth valve are respectively closed, and the first valve and the fourth valve are respectively closed.
- the method may further include discharging the liquefied hydrogen by introducing the hydrogen gas between the valve and the fourth valve.
- the hydrogen gas filling operation and the liquefied hydrogen discharging operation can be performed efficiently.
- the method when filling the space between the second valve and the third valve of the flow path with the nitrogen gas, the second valve and the third valve are respectively closed, and the second valve and the third valve are respectively closed.
- the method may further include discharging the hydrogen gas by introducing the nitrogen gas between the valve and the third valve.
- the nitrogen gas filling operation and the hydrogen gas discharging operation can be performed efficiently.
- the hydrogen gas when filling the hydrogen gas between the first valve and the fourth valve of the flow path, the hydrogen gas is introduced between the first valve and the second valve.
- the method may further include discharging the liquefied hydrogen from between the third valve and the fourth valve.
- the part between the first valve and the fourth valve can be efficiently filled with hydrogen gas by using the device as a flow path for hydrogen gas.
- the method when filling the space between the second valve and the third valve of the flow path with the nitrogen gas, introducing the nitrogen gas between the second valve and the device, The method may further include discharging the hydrogen gas from between the device and the third valve.
- the part between the second valve and the third valve can be efficiently filled with nitrogen gas by using the device as a flow path for nitrogen gas. Additionally, since the inside of the device can be replaced with nitrogen gas through this operation, the device can be removed safely.
- temperature and pressure are detected between the first valve and the second valve or between the third valve and the fourth valve while the device is separated from the flow path.
- the method may further include adjusting the filling amount of the hydrogen gas according to the detection result of at least one of the temperature and pressure.
- the filling amount of the hydrogen gas is increased. It may also be something that allows you to do so.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
Description
以上、本開示に係る機器のメンテナンス方法について説明したが、本開示は上掲の実施形態に何ら限定されない。例えば、上述の機器のメンテナンス方法について、次のような変形実施形態を取ることができる。
以上説明した具体的実施形態には、以下の構成を有する開示が含まれている。
Claims (7)
- 液化水素が流れる方向に沿って順に配置される、第1バルブと、第2バルブと、機器と、第3バルブと、第4バルブとを有する流路における、機器のメンテナンス方法であって、
前記流路の前記第1バルブと前記第4バルブとの間に水素ガスを充填することと、
前記流路の前記第1バルブと前記第4バルブとの間に前記水素ガスが充填された状態から、前記流路の前記第2バルブと前記第3バルブとの間に窒素ガスを充填することと、
前記流路の前記第2バルブと前記第3バルブとの間に前記窒素ガスが充填された状態で、前記第2バルブと前記機器との間、及び前記第3バルブと前記機器との間の前記流路をそれぞれ分断および封止し、前記機器を前記流路から分離することと、
を備える、機器のメンテナンス方法。 - 請求項1に記載の機器のメンテナンス方法であって、
前記流路の前記第1バルブと前記第4バルブとの間に前記水素ガスを充填する際に、前記第1バルブと前記第4バルブとをそれぞれ閉止して、前記第1バルブと前記第4バルブとの間に前記水素ガスを導入することで前記液化水素を排出することを更に含む、機器のメンテナンス方法。 - 請求項1または2に記載の機器のメンテナンス方法であって、
前記流路の前記第2バルブと前記第3バルブとの間に前記窒素ガスを充填する際に、前記第2バルブと前記第3バルブとをそれぞれ閉止して、前記第2バルブと前記第3バルブとの間に前記窒素ガスを導入することで前記水素ガスを排出することを更に含む、機器のメンテナンス方法。 - 請求項2に記載の機器のメンテナンス方法であって、
前記流路の前記第1バルブと前記第4バルブとの間に前記水素ガスを充填する際に、前記第1バルブと前記第2バルブとの間に前記水素ガスを導入し、前記第3バルブと前記第4バルブとの間から前記液化水素を排出することを更に含む、機器のメンテナンス方法。 - 請求項3に記載の機器のメンテナンス方法であって、
前記流路の前記第2バルブと前記第3バルブとの間に前記窒素ガスを充填する際に、前記第2バルブと前記機器との間に前記窒素ガスを導入し、前記機器と前記第3バルブとの間から前記水素ガスを排出することを更に含む、機器のメンテナンス方法。 - 請求項1乃至5の何れか1項に記載の機器のメンテナンス方法であって、
前記機器が前記流路から分離された状態で、前記第1バルブと前記第2バルブとの間または前記第3バルブと前記第4バルブとの間の温度および圧力を検出し、当該温度および圧力のうちの少なくとも一方の検出結果に応じて、前記水素ガスの充填量を調整することを更に備える、機器のメンテナンス方法。 - 請求項6に記載の機器のメンテナンス方法であって、
前記第1バルブと前記第2バルブとの間または前記第3バルブと前記第4バルブとの間における温度または圧力が下がったことを検出すると、前記水素ガスの充填量を増大させる、機器のメンテナンス方法。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/848,643 US12613006B2 (en) | 2022-03-28 | 2023-03-22 | Equipment maintenance method and liquefied hydrogen system |
| AU2023245547A AU2023245547B2 (en) | 2022-03-28 | 2023-03-22 | Equipment maintenance method and liquified hydrogen system |
| CA3250828A CA3250828A1 (en) | 2022-03-28 | 2023-03-22 | EQUIPMENT MAINTENANCE PROCEDURE |
| EP23779960.6A EP4484820A4 (en) | 2022-03-28 | 2023-03-22 | EQUIPMENT MAINTENANCE PROCEDURES |
| KR1020247034080A KR20240161165A (ko) | 2022-03-28 | 2023-03-22 | 기기의 메인터넌스 방법 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022051696A JP7851166B2 (ja) | 2022-03-28 | 2022-03-28 | 機器のメンテナンス方法、液化水素システム |
| JP2022-051696 | 2022-03-28 |
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| PCT/JP2023/011248 Ceased WO2023189948A1 (ja) | 2022-03-28 | 2023-03-22 | 機器のメンテナンス方法 |
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| US (1) | US12613006B2 (ja) |
| EP (1) | EP4484820A4 (ja) |
| JP (1) | JP7851166B2 (ja) |
| KR (1) | KR20240161165A (ja) |
| AU (1) | AU2023245547B2 (ja) |
| CA (1) | CA3250828A1 (ja) |
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| WO2024143053A1 (ja) * | 2022-12-28 | 2024-07-04 | 川崎重工業株式会社 | 液化水素ポンプのガス置換方法 |
| WO2025100137A1 (ja) * | 2023-11-09 | 2025-05-15 | 川崎重工業株式会社 | 荷役システム、切離し方法、及び、荷役開始方法 |
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| JP2009242944A (ja) * | 2008-03-11 | 2009-10-22 | Toyo Tanso Kk | フッ素ガス発生装置 |
| JP5495713B2 (ja) | 2009-10-28 | 2014-05-21 | Ihiプラント建設株式会社 | Lng受入基地タンクからのlng出荷方法及びその装置 |
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| EP4446640A3 (en) * | 2021-11-22 | 2025-01-01 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method of operating a cold cryogenic liquid supply chain |
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- 2022-03-28 JP JP2022051696A patent/JP7851166B2/ja active Active
-
2023
- 2023-03-22 CA CA3250828A patent/CA3250828A1/en active Pending
- 2023-03-22 US US18/848,643 patent/US12613006B2/en active Active
- 2023-03-22 AU AU2023245547A patent/AU2023245547B2/en active Active
- 2023-03-22 EP EP23779960.6A patent/EP4484820A4/en active Pending
- 2023-03-22 KR KR1020247034080A patent/KR20240161165A/ko active Pending
- 2023-03-22 WO PCT/JP2023/011248 patent/WO2023189948A1/ja not_active Ceased
- 2023-03-24 TW TW114112351A patent/TWI913145B/zh active
- 2023-03-24 TW TW112111211A patent/TWI882302B/zh active
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| JP2009242944A (ja) * | 2008-03-11 | 2009-10-22 | Toyo Tanso Kk | フッ素ガス発生装置 |
| JP5495713B2 (ja) | 2009-10-28 | 2014-05-21 | Ihiプラント建設株式会社 | Lng受入基地タンクからのlng出荷方法及びその装置 |
| JP2016070377A (ja) * | 2014-09-30 | 2016-05-09 | 川崎重工業株式会社 | 液化水素移送システム |
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| WO2025100137A1 (ja) * | 2023-11-09 | 2025-05-15 | 川崎重工業株式会社 | 荷役システム、切離し方法、及び、荷役開始方法 |
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| AU2023245547B2 (en) | 2026-03-05 |
| CA3250828A1 (en) | 2025-03-10 |
| TW202348543A (zh) | 2023-12-16 |
| JP2023144623A (ja) | 2023-10-11 |
| US20250207731A1 (en) | 2025-06-26 |
| AU2023245547A1 (en) | 2024-10-17 |
| TWI882302B (zh) | 2025-05-01 |
| JP7851166B2 (ja) | 2026-04-24 |
| KR20240161165A (ko) | 2024-11-12 |
| EP4484820A4 (en) | 2025-06-25 |
| TW202532772A (zh) | 2025-08-16 |
| EP4484820A1 (en) | 2025-01-01 |
| US12613006B2 (en) | 2026-04-28 |
| TWI913145B (zh) | 2026-01-21 |
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