WO2021014969A1 - 水素精製システム - Google Patents

水素精製システム Download PDF

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WO2021014969A1
WO2021014969A1 PCT/JP2020/026633 JP2020026633W WO2021014969A1 WO 2021014969 A1 WO2021014969 A1 WO 2021014969A1 JP 2020026633 W JP2020026633 W JP 2020026633W WO 2021014969 A1 WO2021014969 A1 WO 2021014969A1
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anode
hydrogen
cathode
gas
electrolyte membrane
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English (en)
French (fr)
Japanese (ja)
Inventor
松本　拓
佳央 田村
拓也 赤塚
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Priority to CN202080049895.1A priority Critical patent/CN114080474A/zh
Priority to JP2021533923A priority patent/JPWO2021014969A1/ja
Priority to EP20842673.4A priority patent/EP4006209A4/en
Publication of WO2021014969A1 publication Critical patent/WO2021014969A1/ja
Anticipated expiration legal-status Critical
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen; Reversible storage of hydrogen
    • C01B3/02—Production of hydrogen; Production of gaseous mixtures containing hydrogen
    • C01B3/32—Production of hydrogen; Production of gaseous mixtures containing hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide or air
    • C01B3/34—Production of hydrogen; Production of gaseous mixtures containing hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide or air by reaction of hydrocarbons with gasifying agents
    • C01B3/38—Production of hydrogen; Production of gaseous mixtures containing hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide or air by reaction of hydrocarbons with gasifying agents using catalysts
    • C01B3/384—Production of hydrogen; Production of gaseous mixtures containing hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide or air by reaction of hydrocarbons with gasifying agents using catalysts with external heating of the catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
    • B01D53/326—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00 in electrochemical cells
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen; Reversible storage of hydrogen
    • C01B3/50—Separation of hydrogen or hydrogen-containing gases from gaseous mixtures, e.g. purification
    • 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
    • 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
    • C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
    • C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
    • C25B9/23—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms comprising ion-exchange membranes in or on which electrode material is embedded
    • 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
    • C25B9/70—Assemblies comprising two or more cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
    • H01M8/0662—Treatment of gaseous reactants or gaseous residues, e.g. cleaning
    • H01M8/0681—Reactant purification by the use of electrochemical cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/16—Hydrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/80—Water
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M2008/1095—Fuel cells with polymeric electrolytes
    • 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
    • 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
    • Y02E60/50—Fuel cells

Definitions

  • the present disclosure includes a hydrogen generator that generates a hydrogen-containing gas from a raw material gas, and a plurality of electrochemical devices that purify high-purity purified hydrogen gas from the hydrogen-containing gas, and the purified hydrogen gas is produced by a plurality of electrochemical devices.
  • the present invention relates to a hydrogen purification system that purifies purified hydrogen gas, which is high-purity hydrogen, by purifying.
  • a hydrogen-containing gas is supplied to the anode of an electrochemical device in which an electrolyte membrane is sandwiched between an anode and a cathode, and a current is passed between the anode and the cathode to obtain impurities from the hydrogen-containing gas.
  • the cathode of the upstream electrochemical device and the anode of the downstream electrochemical device are connected to purify purified hydrogen gas with high hydrogen purity.
  • a hydrogen-containing gas is supplied from a hydrogen generator that reforms the raw material gas to generate a hydrogen-containing gas to the anode of the electrochemical device, and the anode-off gas discharged from the anode is discharged by the hydrogen generator. It is supplied to a combustor that controls the temperature of the reforming reaction, and the anode off gas is used for the combustion of the reforming reaction (see, for example, Patent Document 1).
  • a conventional hydrogen purification system generally uses a plurality of electrochemical devices to purify high-purity purified hydrogen gas, and supplies the anode-off gas of each electrochemical device to a combustor.
  • FIG. 2 is a block diagram showing the configuration of a conventional hydrogen purification system.
  • the conventional hydrogen purification system 200 includes a hydrogen generator 21, a first electrochemical device 25a, a second electrochemical device 25b, a first power source 26a, a second power source 26b, and combustion.
  • a vessel 27, a first reflux path 28a, and a second reflux path 28b are provided.
  • the first electrochemical device 25a has a first anode 22a, a first cathode 23a, and a first electrolyte membrane 24a.
  • the second electrochemical device 25b has a second anode 22b, a second cathode 23b, and a second electrolyte membrane 24b.
  • the hydrogen-containing gas generated by the hydrogen generation device 21 is supplied to the first anode 22a.
  • the purified hydrogen gas discharged from the first cathode 23a is supplied to the second anode 22b.
  • the first power supply 26a causes a current to flow between the first anode 22a and the first cathode 23a.
  • the second power supply 26b causes a current to flow between the second anode 22b and the second cathode 23b.
  • the combustor 27 burns the anode off gas to heat the hydrogen generator 21.
  • the first reflux path 28a supplies the anode off gas discharged from the first anode 22a to the combustor 27.
  • the second reflux path 28b supplies the anode off gas discharged from the second anode 22b to the combustor 27.
  • an electrolyte membrane-electrode assembly in which a first electrolyte membrane 24a that selectively transports protons is sandwiched between a first anode 22a and a first cathode 23a is sandwiched by a pair of separators. I'm holding it.
  • the second electrochemical device 25b uses, for example, a pair of separators sandwiching an electrolyte membrane-electrode assembly (MEA) in which a second electrolyte membrane 24b that selectively transports protons is sandwiched between a second anode 22b and a second cathode 23b. I'm holding it.
  • MEA electrolyte membrane-electrode assembly
  • a hydrogen-containing gas is supplied to the first anode 22a, and a current flows between the first anode 22a and the first cathode 23a, so that the oxidation reaction of (Chemical Formula 1) occurs in the first anode 22a, and the first cathode 23a In, the reduction reaction of (Chemical formula 2) occurs.
  • the purified hydrogen gas discharged from the first cathode 23a is supplied to the second anode 22b, and the second anode 22b and the second cathode are used.
  • the oxidation reaction of (Chemical formula 1) occurs at the second anode 22b
  • the reduction reaction of (Chemical formula 2) occurs at the second cathode 23b.
  • the hydrogen-containing gas supplied to the first anode 22a the hydrogen-containing gas discharged from the first anode 22a without penetrating from the first anode 22a to the first cathode 23a via the first electrolyte membrane 24a.
  • anode off gas defined as anode off gas.
  • the hydrogen generator 21 is heated by supplying the anode off-gas to the combustor 27 from the first reflux path 28a and burning the anode-off gas in the combustor 27.
  • the hydrogen-containing gas discharged from the second anode 22b without penetrating from the second anode 22b to the second cathode 23b via the second electrolyte membrane 24b.
  • the hydrogen generating device 21 is heated by supplying the hydrogen-containing gas to the combustor 27 from the second reflux path 28b and burning the hydrogen-containing gas.
  • the ratio of the flow rate of purified hydrogen gas is defined as the hydrogen utilization rate.
  • the first electrochemical device 25a and the second electrochemical device 25b operate at a predetermined hydrogen utilization rate. When the hydrogen utilization rate of the electrochemical device is 100%, the anode off gas supplied to the combustor 27 becomes 0. In this case, the hydrogen generation device 21 does not overheat, but the deterioration of the electrochemical device is promoted. Therefore, the hydrogen utilization rate of an electrochemical device is generally set to a value of less than 100%.
  • the anode off gas of all electrochemical devices is supplied to the combustor. Therefore, when the hydrogen utilization rate of the electrochemical device is kept at a predetermined value, the supply amount of the anode off gas supplied to the combustor increases as the number of the electrochemical devices connected in series increases. Therefore, there is a problem that the hydrogen generating apparatus deteriorates due to excessive temperature rise, and a problem that the efficiency is lowered by burning the anode off gas having a relatively high hydrogen purity of the electrochemical device which is not the most upstream.
  • An object of the present disclosure is to provide a hydrogen purification system in which the supply amount of anode off-gas supplied to a combustor does not increase even if the number of electrochemical devices connected in series increases.
  • the hydrogen purification system of the present disclosure uses the anode off gas of the electrochemical device, which is the most upstream of the plurality of electrochemical devices connected in series, as a combustor for heating the hydrogen generator. Be supplied.
  • the anode-off gas of the electrochemical device that is not the most upstream is configured to join the gas supplied to the anode of the electrochemical device or the electrochemical device provided upstream of the electrochemical device.
  • the hydrogen purification system of the present disclosure increases the number of electrochemical devices connected in series, and even when the hydrogen utilization rate of the electrochemical devices is maintained at a predetermined value, the supply amount of the anode off gas supplied to the combustor. It is possible to realize a hydrogen purification system in which the amount of hydrogen is not increased.
  • FIG. 1 is a block diagram showing a configuration of a hydrogen purification system according to the first embodiment of the present disclosure.
  • FIG. 2 is a block diagram showing the configuration of a conventional hydrogen purification system.
  • an electrolyte membrane-electrode junction is formed by an anode arranged on one surface of the electrolyte membrane and the electrolyte membrane and a cathode arranged on the other surface of the electrolyte membrane, and a hydrogen-containing gas is provided at the anode. Is supplied, and a current in a predetermined direction flows between the anode and the cathode, so that purified hydrogen gas having a higher purity of hydrogen than the hydrogen-containing gas supplied to the anode is discharged from the cathode.
  • a chemical device a hydrogen generator that supplies a hydrogen-containing gas generated from a raw material gas, a power source that allows a current to flow between the anode and cathode of a plurality of electrochemical devices, and a combustor that heats the hydrogen generator.
  • the hydrogen generator supplies hydrogen-containing gas to the anode of the most upstream electrochemical device among the plurality of the electrochemical devices, and the purified hydrogen gas discharged from the cathode of the most upstream electrochemical device is the most. Purified hydrogen gas discharged from the cathode of the electrochemical device on the upstream side so as to be supplied to the anode of the electrochemical device adjacent to the electrochemical device on the upstream side and between the electrochemical devices adjacent to each other.
  • a plurality of electrochemical devices are connected in series so as to be supplied to the anode of the electrochemical device on the downstream side.
  • the combustor is configured to burn the hydrogen-containing gas supplied to the anode of the most upstream electrochemical device, which is discharged from the anode without penetrating from the anode to the cathode through the electrolyte membrane. Will be done.
  • the hydrogen generation system supplies the anode with the purified hydrogen gas supplied to the anode of a non-upstream electrochemical device, which is discharged from the anode without penetrating from the anode to the cathode through the electrolyte membrane. It is configured to join the gas to be produced.
  • the first electrolyte is provided by a first anode arranged on one surface of the first electrolyte membrane and the first electrolyte membrane and a first cathode arranged on the other surface of the first electrolyte membrane.
  • a film-electrode junction is formed, a hydrogen-containing gas is supplied to the first anode, and a current in a predetermined direction flows between the first anode and the first cathode to purify hydrogen with a higher purity than the hydrogen-containing gas.
  • a first electrochemical device configured to discharge hydrogen gas from the first cathode, and a first electrochemical device connected in series and arranged on one surface of a second electrolyte membrane and a second electrolyte membrane.
  • the second anode and the second cathode arranged on the other surface of the second anode film form a second electrolyte membrane-electrode junction, and purified hydrogen gas is supplied to the second anode to provide the second anode and the second cathode.
  • a second electrochemical device configured to discharge purified hydrogen gas, which has a higher purity than purified hydrogen gas, from the second anode by flowing a current in a predetermined direction between the two, and a hydrogen-containing device generated from the raw material gas.
  • a hydrogen generator that supplies gas to the first anode, a power source that allows current to flow between the first anode and the first cathode, and between the second anode and the second anode, and a hydrogen content supplied to the first anode.
  • a combustor that heats the hydrogen generator by burning the hydrogen-containing gas discharged from the first anode without penetrating from the first anode to the first anode through the first electrolyte membrane, and the second anode.
  • the purified hydrogen gas supplied to the second anode the purified hydrogen gas discharged from the second anode without penetrating from the second anode to the second anode through the second anode film is supplied to the second anode. It is provided with a reflux path for merging with the gas.
  • FIG. 1 is a block diagram showing a configuration of a hydrogen purification system according to the first embodiment of the present disclosure.
  • the hydrogen purification system 100 of the present embodiment includes a hydrogen generator 1, a first electrochemical device 5a, a second electrochemical device 5b, a first power source 6a, and a second power source 6b.
  • a combustor 7 for burning the anode off gas to heat the hydrogen generating apparatus 1, a first reflux path 8a, a second reflux path 8b, and a pump 9 are provided.
  • the hydrogen generation device 1 generates a hydrogen-containing gas by a reforming reaction using a raw material gas and water.
  • a reforming catalyst (not shown) and a combustor 7 are mounted inside the hydrogen generating apparatus 1. Water is heated inside the hydrogen generating apparatus 1 to become steam, which reacts with the raw material gas in the reforming catalyst to generate hydrogen-containing gas.
  • As the raw material gas city gas containing methane as a main component is used.
  • the first electrochemical device 5a is configured by sandwiching an electrolyte membrane-electrode assembly (MEA) in which a first electrolyte membrane 4a is sandwiched between a first anode 2a and a first cathode 3a by a pair of separators.
  • MEA electrolyte membrane-electrode assembly
  • the hydrogen-containing gas generated by the hydrogen generation device 1 is supplied to the first anode 2a of the first electrochemical device 5a.
  • hydrogen in the hydrogen-containing gas supplied to the first anode 2a is transferred to the first cathode 3a via the first electrolyte membrane 4a.
  • purified hydrogen gas having a higher hydrogen purity than the hydrogen-containing gas supplied to the first anode 2a is discharged from the first cathode 3a.
  • the second electrochemical device 5b is configured by sandwiching an electrolyte membrane-electrode assembly (MEA) in which a second electrolyte membrane 4b is sandwiched between a second anode 2b and a second cathode 3b by a pair of separators.
  • MEA electrolyte membrane-electrode assembly
  • the purified hydrogen gas discharged from the first cathode 3a of the first electrochemical device 5a is supplied to the second anode 2b.
  • a current flows in a predetermined direction between the second anode 2b and the second cathode 3b
  • the hydrogen in the hydrogen-containing gas supplied to the second anode 2b is transferred to the second cathode 3b via the second electrolyte membrane 4b.
  • purified hydrogen gas having a higher hydrogen purity than the purified hydrogen gas supplied to the second anode 2b is discharged from the second cathode 3b.
  • the first power supply 6a is a DC power supply in which the positive terminal is electrically connected to the first anode 2a and the negative terminal is electrically connected to the first cathode 3a.
  • the first power source 6a passes a current in the direction from the first anode 2a of the first electrochemical device 5a to the first cathode 3a via the first electrolyte membrane 4a.
  • the second power supply 6b is a DC power supply in which the positive terminal is electrically connected to the second anode 2b and the negative terminal is electrically connected to the second cathode 3b.
  • the second power source 6b passes a current in the direction from the second anode 2b of the second electrochemical device 5b to the second cathode 3b via the second electrolyte membrane 4b.
  • the first reflux path 8a is the first hydrogen-containing gas supplied from the hydrogen generator 1 to the first anode 2a without permeating from the first anode 2a to the first cathode 3a via the first electrolyte membrane 4a. This is a path for supplying the hydrogen-containing gas discharged from the anode 2a, that is, the anode off gas to the combustor 7.
  • the second reflux path 8b is a second of the purified hydrogen gas supplied from the first cathode 3a to the second anode 2b without being permeated from the second anode 2b to the second cathode 3b via the second electrolyte membrane 4b. This is a route for merging the purified hydrogen gas discharged from the anode 2b with the purified hydrogen gas supplied from the first cathode 3a to the second anode 2b.
  • the pump 9 is provided in the second recirculation path 8b, and of the purified hydrogen gas supplied to the second anode 2b, the pump 9 does not permeate from the second anode 2b to the second cathode 3b via the second electrolyte membrane 4b. 2
  • the purified hydrogen gas discharged from the anode 2b is merged with the purified hydrogen gas supplied from the first cathode 3a to the second anode 2b.
  • the hydrogen generation device 1 is connected to the first anode 2a of the first electrochemical device 5a so that the hydrogen-containing gas generated by the hydrogen generation device 1 is supplied to the first anode 2a of the first electrochemical device 5a. ing.
  • the second electrochemical device 5b is connected to the first cathode 3a of the first electrochemical device 5a so that the purified hydrogen gas discharged from the first cathode 3a is supplied to the second anode 2b.
  • the flow rate of purified hydrogen gas purified by the hydrogen purification system 100 is 10 L / min.
  • the current value flowing through the first power supply 6a is 9.
  • the current value flowing through the first power supply 6a is 9.
  • Purified hydrogen gas at a flow rate of 10 L / min is discharged from the first cathode 3a.
  • the value of the current flowing through the second power source 6b is 9. Set to .5A.
  • Purified hydrogen gas at a flow rate of 10 L / min is discharged from the second cathode 3b.
  • the hydrogen utilization rate of the first electrochemical device 5a and the second electrochemical device 5b is set to 83.3%. 2 L / min of hydrogen-containing gas is supplied to the combustor 7.
  • the hydrogen generation device 1 generates a hydrogen-containing gas so that the flow rate of the hydrogen-containing gas supplied to the first anode 2a is 12 L / min.
  • a current having a value of 9.5 A flows through the first power source 6a
  • purified hydrogen gas having a flow rate of 10 L / min is discharged from the first cathode 3a.
  • the hydrogen-containing gas supplied to the first anode 2a the hydrogen-containing gas discharged from the first anode 2a without penetrating from the first anode 2a to the first cathode 3a via the first electrolyte membrane 4a is 2 L / L /. It is supplied to the combustor 7 by the first reflux path 8a at a flow rate of min.
  • purified hydrogen gas at a flow rate of 10 L / min is discharged from the second cathode 3b.
  • the purified hydrogen gas supplied to the second anode 2b the purified hydrogen gas discharged from the second anode 2b without penetrating from the second anode 2b to the second cathode 3b via the second electrolyte membrane 4b, that is, the second anode.
  • the purified hydrogen gas passing through the reflux path 8b joins the purified hydrogen gas supplied from the first cathode 3a to the second anode 2b at a flow rate of 2 L / min by the pump 9.
  • connection destination of the first reflux path 8a and the connection destination of the second reflux path 8b are different.
  • the hydrogen-containing gas discharged from the first anode 2a is supplied to the combustor 7, but the purified hydrogen gas discharged from the second anode 2b is not supplied.
  • the hydrogen purification system 100 of the present embodiment includes the first electrochemical device 5a and the first electrochemical device 5a connected in series so that the purified hydrogen gas discharged from the first cathode 3a is supplied to the second anode 2b. It includes a second electrochemical device 5b, a hydrogen generating device 1, a first power source 6a, a second power source 6b, a combustor 7, a second recirculation path 8b, and a pump 9.
  • the hydrogen generation device 1 supplies the hydrogen-containing gas generated from the raw material gas to the first anode 2a.
  • the first power source 6a causes a current flowing from the first anode 2a to the first cathode 3a via the first electrolyte membrane 4a.
  • the second power source 6b causes a current flowing from the second anode 2b of the second electrochemical device 5b to the second cathode 3b via the second electrolyte membrane 4b.
  • the combustor 7 is connected to the first anode 2a via the first reflux path 8a, and burns the hydrogen-containing gas discharged from the first anode 2a to heat the hydrogen generator 1.
  • the second reflux path 8b merges the purified hydrogen gas discharged from the second anode 2b with the purified hydrogen gas supplied from the first cathode 3a to the second anode 2b.
  • the pump 9 is provided in the second reflux path 8b, and merges the purified hydrogen gas discharged from the second anode 2b with the purified hydrogen gas supplied from the first cathode 3a to the second anode 2b.
  • the two electrochemical devices that is, the first electrochemical device 5a and the second electrochemical device 5b are connected in series, and the hydrogen utilization rate of the first electrochemical device 5a and the hydrogen of the second electrochemical device 5b are connected. Even if the utilization rate is 83.3%, deterioration of the hydrogen generating apparatus 1 due to excessive temperature rise is suppressed.
  • the hydrogen-containing gas supplied to the combustor 7 is only the hydrogen-containing gas for one unit supplied from the first anode 2a through the first reflux path 8a, and the purified hydrogen discharged from the second anode 2b. This is because the gas is supplied to the second anode 2b. Therefore, the anode off gas of the second electrochemical device 5b can be effectively utilized, and an efficient hydrogen purification system can be realized.
  • the number of electrochemical devices connected in series downstream from the second electrochemical device 5b is increased, and hydrogen is purified with the hydrogen utilization rate of the electrochemical device as a predetermined value. Even in this case, the flow rate of the hydrogen-containing gas supplied to the combustor 7 does not increase. Therefore, it is possible to realize a hydrogen purification system 100 in which the hydrogen generation device 1 does not overheat and deterioration is suppressed.
  • the anode off gas of the second electrochemical device 5b is merged with the purified hydrogen gas supplied to the second anode 2b
  • the present invention is not limited to this.
  • the anode-off gas of the second electrochemical device 5b may be merged with the hydrogen-containing gas supplied to the first anode 2a, and in this case, the supply amount of the anode-off gas supplied to the combustor 7 does not increase.
  • the third electrochemical device is used.
  • the configuration may include a recirculation path for merging the anode off gas with at least one of the purified hydrogen gas supplied to the second anode 2b and the gas supplied to the third anode (not shown).
  • the hydrogen purification system supplies the combustor even when the number of electrochemical devices connected in series is increased and the hydrogen utilization rate of the electrochemical devices is maintained at a predetermined value.
  • the supply of anode off-gas is not increased. Therefore, it can be applied to the application of purifying purified hydrogen gas having high hydrogen purity from the hydrogen-containing gas generated by the hydrogen generator by using a plurality of electrochemical devices connected in series.

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PCT/JP2020/026633 2019-07-25 2020-07-08 水素精製システム Ceased WO2021014969A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202080049895.1A CN114080474A (zh) 2019-07-25 2020-07-08 氢提纯系统
JP2021533923A JPWO2021014969A1 (https=) 2019-07-25 2020-07-08
EP20842673.4A EP4006209A4 (en) 2019-07-25 2020-07-08 Hydrogen purification system

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JP2024544190A (ja) * 2021-12-01 2024-11-28 エドワーズ バキューム リミテッド ライアビリティ カンパニー 水素回収システム及び方法
JP7852050B2 (ja) 2021-12-01 2026-04-27 エドワーズ バキューム リミテッド ライアビリティ カンパニー 水素回収システム及び方法

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