WO2022164132A1 - 격막이 구비된 전해액 보정부를 포함하는 수전해 장치 - Google Patents
격막이 구비된 전해액 보정부를 포함하는 수전해 장치 Download PDFInfo
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- WO2022164132A1 WO2022164132A1 PCT/KR2022/001103 KR2022001103W WO2022164132A1 WO 2022164132 A1 WO2022164132 A1 WO 2022164132A1 KR 2022001103 W KR2022001103 W KR 2022001103W WO 2022164132 A1 WO2022164132 A1 WO 2022164132A1
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- electrolyte
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 625
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 138
- 239000012528 membrane Substances 0.000 claims description 73
- 238000005341 cation exchange Methods 0.000 claims description 57
- 239000003011 anion exchange membrane Substances 0.000 claims description 56
- 150000002500 ions Chemical class 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 9
- 238000004880 explosion Methods 0.000 abstract description 9
- 239000000203 mixture Substances 0.000 abstract description 8
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 230000006641 stabilisation Effects 0.000 abstract description 4
- 238000011105 stabilization Methods 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 description 93
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 82
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 65
- 229910001882 dioxygen Inorganic materials 0.000 description 65
- 239000007789 gas Substances 0.000 description 64
- 150000001450 anions Chemical class 0.000 description 24
- 150000001768 cations Chemical class 0.000 description 24
- 230000004888 barrier function Effects 0.000 description 20
- 239000007791 liquid phase Substances 0.000 description 19
- 239000012071 phase Substances 0.000 description 19
- 239000008151 electrolyte solution Substances 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 14
- 239000002360 explosive Substances 0.000 description 14
- 230000004308 accommodation Effects 0.000 description 11
- -1 hydroxide ions Chemical class 0.000 description 10
- 229910001414 potassium ion Inorganic materials 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000001257 hydrogen Substances 0.000 description 9
- 229910052739 hydrogen Inorganic materials 0.000 description 9
- 238000007599 discharging Methods 0.000 description 8
- 239000003014 ion exchange membrane Substances 0.000 description 8
- 239000011148 porous material Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 230000035699 permeability Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000012466 permeate Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000002952 polymeric resin Substances 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 150000001447 alkali salts Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007792 gaseous phase Substances 0.000 description 2
- 239000010954 inorganic particle Substances 0.000 description 2
- 230000010220 ion permeability Effects 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 229920000491 Polyphenylsulfone Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000005518 polymer electrolyte Substances 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Images
Classifications
-
- 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
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
- C25B15/087—Recycling of electrolyte to electrochemical cell
-
- 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
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
- C25B15/085—Removing impurities
-
- 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
-
- 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
- C25B13/00—Diaphragms; Spacing elements
- C25B13/02—Diaphragms; Spacing elements characterised by shape or form
-
- 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
- C25B15/02—Process control or regulation
- C25B15/023—Measuring, analysing or testing during electrolytic production
- C25B15/025—Measuring, analysing or testing during electrolytic production of electrolyte parameters
- C25B15/029—Concentration
-
- 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
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
-
- 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
- C25B9/21—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms two or more diaphragms
-
- 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
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
- C25B15/083—Separating products
-
- 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
Definitions
- the present invention relates to a water electrolysis device including an electrolyte correction unit provided with a diaphragm.
- Water electrolysis technology which is a representative hydrogen production technology, is a technology that directly produces hydrogen from water using electric energy, and can produce high-purity hydrogen in an environment-friendly manner.
- the water electrolysis technology is divided into alkaline water electrolysis, polymer electrolyte water electrolysis, and solid oxide water electrolysis.
- the alkaline water electrolysis technique is advantageous in that it is inexpensive and can produce hydrogen in a large capacity.
- the alkaline water electrolyzer is an electrolyzer that produces hydrogen, a gas-liquid separator that separates electrolyte from gas-phase hydrogen or oxygen discharged from the electrolyzer, an electrolyte storage tank that stores the liquid phase discharged from the gas-liquid separator and puts it back into the electrolyzer, and the electrolyte It is composed of a balance of plant that supplies and controls and manages power.
- the electrolytic cell consists of an electrolyte, a separator, and an anode (anode) and a cathode (cathode), which are electrodes, and the following reaction occurs in the anode and cathode:
- the electrolyte containing the dissolved oxygen gas produced by the reaction is separated into oxygen gas and the electrolyte through the anode-side gas-liquid separator, and the dissolved hydrogen gas produced by the reaction in the cathode chamber of the electrolyzer is removed.
- the included electrolyte is separated into hydrogen gas and electrolyte through a gas-liquid separator on the cathode side.
- the oxygen gas and the dissolved hydrogen gas dissolved in the electrolyte are a concept including a state in which oxygen gas and hydrogen gas are dissolved in the electrolyte and a state in which the oxygen gas and hydrogen gas remain in the form of microbubbles.
- 'Patent Document 1' on a water electrolysis device for generating hydrogen gas, an anode chamber for accommodating an anode and generating anode gas, and an anode chamber for accommodating a cathode and generating hydrogen gas
- a water electrolysis device having a cathode chamber, a diaphragm for dividing the anode chamber and the cathode chamber, and an anode side circulation line for discharging an electrolyte from the anode chamber and returning it to the anode chamber, wherein the anode side circulation line is removed from the electrolyte
- An anode side gas-liquid separator for separating the anode gas, an anode side discharge line for connecting the anode chamber and the anode side gas-liquid separator, and discharging the electrolyte and the anode gas from the anode chamber to supply the anode side gas-liquid separator; and an anode-
- Patent Document 1 describes discharging the gas discharged from the gas phase region of the electrolyte storage tank to the outside of the system. Even if it is, it is difficult to obtain a gas with high purity.
- the electrolyte recovered from the anode chamber and the electrolyte recovered from the cathode chamber are stored and circulated to different electrolyte storage tanks, the difference in the number of moles consumed in the anode reaction and the cathode reaction is stored in the anode-side electrolyte storage tank and the cathode-side electrolyte storage tank. There is a problem in that the concentration difference of the existing electrolyte occurs.
- the composition of the gas in the gas phase region of the electrolyte storage tank is prevented from reaching the explosive limit, and at the same time, the concentration difference of the electrolyte does not occur even when the electrolyte discharged from the anode chamber and the electrolyte discharged from the cathode chamber are independently circulated.
- a non-water electrolytic device is required.
- the present invention prevents the gas composition in the gas phase region of the water electrolysis device from reaching the explosive limit, and at the same time, the electrolyte solution discharged from the anode chamber and the electrolyte solution discharged from the cathode chamber are independently circulated. To provide a water electrolysis device that does not occur.
- the present invention provides an electrolytic cell comprising an anode chamber and a cathode chamber separated by a partition; an anode chamber electrolyte accommodating part and a cathode chamber electrolyte accommodating part, wherein the anode chamber electrolyte accommodating part and the cathode chamber electrolyte accommodating part are separated by a diaphragm; an anode circulation line communicating with the anode chamber of the electrolyzer and the anode chamber electrolyte accommodating part of the electrolyte correction unit; and a cathode circulation line communicating with the cathode chamber of the electrolyzer and the cathode chamber electrolyte accommodating part of the electrolyte correction unit.
- the anode side gas-liquid separator provided in the anode circulation line; and a cathode-side gas-liquid separator provided in the cathode circulation line.
- the anode-side gas-liquid separator is provided at the rear end of the anode chamber of the electrolyzer along the anode circulation line and at the front end of the anode chamber electrolyte receiving unit of the electrolyte correction unit, and the cathode-side gas-liquid separator is disposed along the cathode circulation line of the electrolytic cell. It may be provided at the rear end of the cathode chamber and at the front end of the cathode chamber electrolyte accommodating unit of the electrolyte correction unit.
- the anode-side gas-liquid separator is provided at the rear end of the anode chamber electrolyte accommodating part of the electrolyte correction unit and the front end of the anode chamber of the electrolyzer along the anode circulation line, and the cathode-side gas-liquid separator carries the electrolyte along the cathode circulation line. It may be provided at the rear end of the cathode chamber of the positive electrode chamber and the front end of the cathode chamber of the electrolyzer.
- the diaphragm may be permeable to electrolyte and ions, and impermeable to gas.
- the diaphragm may be a porous membrane.
- the diaphragm may be a cation exchange membrane or an anion exchange membrane.
- the diaphragm may be provided in plurality, and the anode chamber electrolyte accommodating part and the anode chamber electrolyte accommodating part may be alternately disposed with each other.
- a plurality of diaphragms alternately arranged in a direction in which the receivers are alternately arranged include a cation exchange membrane and an anion exchange membrane alternately may be provided.
- an anode and a cathode may be provided at both ends of the electrolyte compensator, respectively, and a diaphragm may be positioned between the anode and the cathode.
- the diaphragm is a cation exchange membrane or an anion exchange membrane
- a cation exchange membrane is positioned on a side adjacent to the anode of the anode chamber electrolyte receiver
- an anion exchange membrane is positioned on a side adjacent to the cathode
- An anion exchange membrane may be positioned on the side
- a cation exchange membrane may be positioned on a side adjacent to the cathode.
- a water supply pipe and a water supply pump for supplying water may be further provided in at least one of the cathode chamber of the electrolyzer, the cathode chamber electrolyte receiving unit of the electrolyte correction unit, and the cathode circulation line.
- the cathode-side gas-liquid separator may further include a water supply pipe and a water supply pump for supplying water.
- the present invention prevents the gas composition in the gas phase region of the water electrolysis device from reaching the explosion limit by including an electrolyte correction unit including a diaphragm for removing the concentration difference between the electrolyte and the electrolyte discharged from the anode chamber and the cathode Even when the electrolyte discharged from the chamber is independently circulated, there is no difference in the concentration of the electrolyte, so an additional device is not required to solve this problem, and the problem of deterioration in fairness due to electrolyte re-injection and operation stabilization can be solved. there is an effect
- FIG. 1 is a configuration diagram showing an electrolyzer, an electrolyte correction unit, an anode circulation line and a cathode circulation line of the water electrolysis device of the present invention.
- FIG. 2 is a block diagram of a water electrolysis device according to an embodiment of the present invention.
- FIG. 3 is a block diagram of a water electrolysis device according to another embodiment of the present invention.
- FIG. 4 is a schematic view showing the shape of the diaphragm inside the electrolyte correction unit of the present invention.
- FIG. 5 is a schematic diagram showing a form in which a plurality of cation exchange membranes are formed inside the electrolyte correction unit of the present invention.
- FIG. 6 is a schematic view showing a form in which the anion exchange membrane is configured in plurality inside the electrolyte correction unit of the present invention.
- FIG. 7 is a schematic view showing a form in which a cation exchange membrane and an anion exchange membrane are configured in plurality inside the electrolyte correction unit of the present invention.
- FIG 8 is a schematic view showing a form in which an electrode is formed in the electrolyte correction unit of the present invention.
- the present invention is an electrolytic cell 100 including an anode chamber 130 and a cathode chamber 150 separated by a partition wall 110, an anode chamber electrolyte accommodating part 410 and a cathode chamber electrolyte accommodating part ( 420), wherein the anode chamber electrolyte accommodating part 410 and the cathode chamber electrolyte accommodating part 420 includes an electrolyte correction part 400 separated by a diaphragm 500, the anode chamber 130 of the electrolyzer, and An anode circulation line 250 that communicates with the anode chamber electrolyte accommodating part 410 of the electrolyte correction unit communicates with the cathode chamber 150 of the electrolytic cell and the cathode chamber electrolyte accommodating unit 420 of the electrolyte correction unit 400 . It provides a water electrolysis device (1) including a cathode circulation line (350).
- the water electrolyzer 1 is a device for producing oxygen gas and hydrogen gas by electrolysis using an electrolyte solution.
- the electrolytic cell 100 includes an anode chamber 140 and includes an anode chamber 130 and a cathode 160 for generating oxygen gas, and a cathode chamber 150 for generating hydrogen gas.
- the anode chamber 130 and the cathode chamber 150 are separated by a partition wall 110 .
- the partition wall 110 divides the anode chamber 130 and the cathode chamber 150 and has a gas barrier property, and the shape or material thereof is not particularly limited.
- the barrier rib 110 may have a plate shape having a predetermined thickness, and the barrier rib 110 preferably has high electrolyte permeability, high ion permeability, and high gas barrier properties.
- the material of the partition wall may include a polymer resin fiber and an inorganic compound, for example, a porous polymer film may be used.
- the anode chamber 130 and the cathode chamber 150 are provided with spaces surrounded by the partition wall 110 and the external frame 120, respectively, and the electrolyte introduced from the electrolyte correction unit 400 passes therethrough.
- hydroxide ions (OH ⁇ ) are consumed and oxygen gas is generated, and in the cathode chamber, hydroxide ions (OH ⁇ ) are generated and hydrogen gas is generated.
- the oxygen gas and hydrogen gas dissolved in the electrolyte is a concept including a state in which oxygen gas and hydrogen gas are dissolved in the electrolyte and a state in which the oxygen gas and hydrogen gas remain in the form of microbubbles.
- the electrolyte correction unit 400 is provided at the front or rear end of the electrolytic cell 100. It is a technical feature.
- the present invention may further include an anode gas-liquid separator 200 provided in the anode circulation line 250 and a cathode gas-liquid separator 300 provided in the upper cathode cathode circulation line 350 .
- the anode-side gas-liquid separator 200 is provided between the anode chamber 130 of the electrolyzer and the anode chamber electrolyte accommodating part 410 of the electrolyte correction part along the anode circulation line 250, Specifically, it is provided at the rear end of the anode chamber 130 of the electrolytic cell along the anode circulation line 250 and at the front end of the anode chamber electrolyte accommodating part 410 of the electrolyte correction unit.
- the cathode-side gas-liquid separator 300 may be provided between the cathode chamber 150 of the electrolytic cell and the cathode chamber electrolyte accommodating part 420 of the electrolyte correction unit along the cathode circulation line 350 , specifically, the cathode The side gas-liquid separator 300 may be provided at the rear end of the cathode chamber 150 of the electrolyzer along the cathode circulation line 350 and at the front end of the cathode chamber electrolyte accommodating unit 420 of the electrolyte correction unit.
- the anode circulation line 250 includes an anode recovery pipe 210 that communicates between the anode chamber 130 and the anode gas-liquid separator 200 , the anode gas-liquid separator 200 and the anode chamber. It may be divided into an anode electrolyte recovery pipe 230 communicating with the electrolyte accommodating part 410 and an anode electrolyte supply pipe 440 communicating with the anode chamber electrolyte accommodating part 410 and the anode chamber 130 .
- the anode-side gas-liquid separator 200 includes a liquid-phase region 201 located at the lower portion and a gas-liquid region 202 located above the liquid-phase region
- the cathode-side gas-liquid separator 300 includes a liquid-phase region 301 located at the lower portion. and a location vapor region 302 on top of the liquid region.
- the cathode circulation line 350 communicates with the cathode recovery tube 310 connecting the cathode chamber 150 and the cathode gas-liquid separator 300 and the cathode-side gas-liquid separator 300 and the cathode chamber electrolyte accommodating part 420 . It may be divided into a cathode electrolyte recovery pipe 330 and a cathode electrolyte supply pipe 450 communicating with the cathode chamber electrolyte accommodating part 420 and the cathode chamber 150 .
- the anode-side gas-liquid separator 200 communicates with the anode chamber 130 through the anode recovery tube 210 , and gas-liquid the electrolyte and oxygen gas discharged from the anode chamber 130 .
- the cathode-side gas-liquid separator 300 communicates with the cathode chamber 150 through the cathode recovery tube 310 , and separates the electrolyte and hydrogen gas discharged from the cathode chamber 150 .
- the anode recovery pipe 210 and the cathode recovery pipe 310 may communicate with the upper portions of the anode-side gas-liquid separator 200 and the cathode-side gas-liquid separator 300 .
- the electrolyte containing the dissolved gas discharged from the electrolyzer is discharged into the gas-liquid separator inside the gas-liquid separator.
- the electrolyte correction unit 400 communicates with the anode side gas-liquid separator 200 through the anode electrolyte recovery pipe 230 and the cathode side gas-liquid separator 300 through the cathode electrolyte recovery pipe 330, and the electrolyte correction unit ( 400)
- a diaphragm 500 is provided inside.
- the electrolyte correction unit 400 includes an anode chamber electrolyte accommodating unit 410 communicating with the anode gas-liquid separator 200 and the anode electrolyte recovery pipe 230 and the cathode-side gas-liquid separator 300 and the cathode electrolyte. and a cathode chamber electrolyte accommodating part 420 communicating through a recovery pipe 330 , wherein the anode chamber electrolyte accommodating part 410 and the cathode chamber electrolyte accommodating part 420 are separated by a diaphragm 500 . .
- the anode electrolyte recovery pipe 230 communicates with the liquid phase region 201 of the anode-side gas-liquid separator 200
- the cathode electrolyte recovery pipe 330 includes a liquid-phase region 301 of the cathode-side gas-liquid separator 300 . communicate with
- the electrolyte correction unit 400 receives the electrolyte present in the liquid phase regions 201 and 301 of the anode-side gas-liquid separator 200 and the cathode-side gas-liquid separator 300 , and uses this in the anode chamber electrolyte accommodating unit 410 , respectively. It is supplied to the anode chamber 130 and the cathode chamber 150 of the electrolytic cell 100 through the anode electrolyte supply pipe 440 and the cathode chamber electrolyte supply pipe 450 in communication with the electrolyte accommodating part 420 in communication with.
- the positive electrolyte supply pipe 440 and the negative electrolyte supply pipe 450 may include a circulation pump 600 for supplying the electrolyte of the electrolyte correction unit 400 to the electrolytic cell 100 .
- the circulation pump 600 may consist of only one circulation pump after combining the positive electrolyte supply pipe 440 and the negative electrolyte supply pipe 450 into one supply pipe.
- the electrolyte introduced from the anode-side gas-liquid separator 200 and the electrolyte introduced from the cathode-side gas-liquid separator 300 with the diaphragm 500 provided in the electrolyte correction unit 400 may be separated in the electrolyte correction unit.
- the diaphragm 500 may have different permeability of liquid and gas in order to pass ions and electrolyte, and to isolate hydrogen gas and oxygen gas generated in the electrolytic cell.
- the diaphragm includes pores, and by adjusting the size of the pores, the permeability of the liquid and the gas may be different. Alternatively, by adjusting the size of the polymer resin fiber or inorganic particles, the permeability of liquid and gas may be different.
- the size of the pores, polymer resin fibers or inorganic particles may be 0.01 ⁇ m to 10 ⁇ m.
- a diaphragm having the above characteristics can be achieved by controlling the diameter, surface area, hydrophilicity, and pore formation structure of pores, and for example, a polymer porous membrane, inorganic porous membrane, woven fabric or nonwoven fabric can be used.
- the diaphragm may be permeable to electrolyte and ions, and impermeable to gas.
- the gas impermeability means that the gas permeability is 10 l/min ⁇ cm 3 or less when measured at a pressure of 5 bar, for example, the diaphragm has a gas permeability of 7 l when measured at a pressure of 5 bar /min ⁇ cm 3 or less or 5 l/min ⁇ cm 3 or less.
- the material of the diaphragm 500 includes polyethylene, polypropylene, polyethylene terephthalate, polysulfone, polyphenylene sulfide, polyether sulfone, polyphenyl sulfone, polyvinylidene fluoride, polyacrylonitrile, polyethylene oxide, It may be at least one selected from the group consisting of polymethyl methacrylate, polyamide, polyether ether ketone, sulfonated polyether ether ketone, polyimide, and copolymers thereof.
- the diaphragm 500 may be a porous membrane, and may have a three-dimensional porous network.
- the size of the pores of the porous membrane is not particularly limited as long as the electrolyte and ions are permeable and the gas can be controlled to be impermeable, and may be, for example, 0.01 ⁇ m to 10 ⁇ m.
- the diaphragm 500 may be an ion exchange membrane, and the ion exchange membrane may be an anion exchange membrane or a cation exchange membrane.
- the ion exchange membrane include a fluorine-containing ion exchange membrane.
- the ion exchange membrane may be porous or non-porous.
- the diaphragm 500 as described above in the electrolyte correction unit 400 it is possible to prevent mixing of the oxygen gas generated from the anode and the hydrogen gas generated from the cathode in the electrolyte correction unit, through which , it is possible to maintain the concentration of hydrogen gas in the oxygen gas and the concentration of oxygen gas in the hydrogen gas below the explosive range.
- the water electrolysis device includes the anode chamber 130 of the electrolyzer 100, the anode recovery tube 210, the anode side gas-liquid separator 200, the anode electrolyte recovery tube 230, the anode chamber electrolyte receiving unit ( 410) and the anode electrolyte supply pipe 440 and the cathode chamber 150 of the electrolyzer 100, the cathode recovery pipe 310, the cathode gas-liquid separator 300, the cathode electrolyte recovery pipe 330, the cathode chamber
- the electrolyte circulating through the electrolyte accommodating part 420 and the negative electrolyte supply pipe 450 independently circulates.
- the oxygen and hydrogen gas of the electrolyte in the anode chamber and the cathode chamber in which oxygen gas and hydrogen gas are dissolved, respectively do not mix, so that the concentration of hydrogen gas can be maintained within the explosive range.
- the present invention includes a diaphragm 500 in the electrolyte correction unit, and the diaphragm has ion permeability Therefore, the difference in concentration between the electrolyte discharged from the anode chamber 130 and the electrolyte discharged from the cathode chamber 150 can be corrected. Accordingly, it is possible to solve the problem of requiring an additional device due to the generation of the difference in the electrolyte level and the problem of deterioration of fairness due to electrolyte re-injection and operation stabilization.
- the electrolyte flowing in from the anode-side gas-liquid separator 200 and the electrolyte flowing in from the cathode-side gas-liquid separator 300 may be alternately introduced with a plurality of diaphragms interposed therebetween.
- the electrolyte correction unit 400 since the electrolyte correction unit 400 includes a plurality of diaphragms, the anode chamber electrolyte accommodation unit 410 and the cathode chamber electrolyte solution accommodation unit 420 may be formed in plural, in this case, the anode chamber electrolyte accommodation unit The part 410 and the cathode chamber electrolyte accommodating part 420 may be alternately arranged and plural.
- the concentration difference can be resolved.
- the plurality of diaphragms may be a cation exchange membrane or an anion exchange membrane, and may be formed of only a cation exchange membrane or only an anion exchange membrane.
- the plurality of diaphragms may be provided with a cation exchange membrane and an anion exchange membrane alternately.
- a plurality of diaphragms alternately arranged according to the direction in which the accommodating parts are alternately arranged are a cation exchange membrane and an anion exchange membrane. This may be provided alternately.
- an anode and a cathode may be provided at both ends of the electrolyte correction unit 400 , and a diaphragm may be positioned between the anode and the cathode.
- the diaphragm is a cation exchange membrane or an anion exchange membrane
- a cation exchange membrane is positioned on a side adjacent to the anode of the anode chamber electrolyte receiver
- an anion exchange membrane is positioned on a side adjacent to the cathode
- an anion is positioned on a side adjacent to the anode of the cathode chamber electrolyte receiver
- An exchange membrane may be positioned, and a cation exchange membrane may be positioned on a side adjacent to the cathode.
- it may be configured to supply a separate electrolyte to the space provided with the positive electrode and the negative electrode.
- the electrolyte used in the present invention may be an aqueous alkali solution in which an alkali salt is dissolved.
- the electrolyte may be an aqueous NaOH solution or a KOH aqueous solution.
- the concentration of the alkali salt may be 1 mass% to 50 mass%, for example, when the pronuclear solution is an aqueous NaOH solution, the NaOH content may be 1 mass% to 20 mass% or 10 mass% to 15 mass% .
- the electrolyte solution is an aqueous KOH solution, the KOH content may be 20% by mass to 50% by mass, for example, 25% by mass to 40% by mass or 25% by mass to 35% by mass.
- a water supply pipe for supplying water from the water storage tank to the cathode chamber 150 of the electrolytic cell, the electrolyte solution receiving unit 420 in the cathode chamber of the electrolyte correction unit, the cathode gas-liquid separator 300 and the cathode circulation line 350, and A water supply pump may be provided.
- the anode-side gas-liquid separator 200 is located at the rear end of the anode chamber electrolyte receiving unit 410 of the electrolyte correction unit along the anode circulation line 250 and at the front end of the anode chamber 130 of the electrolyzer.
- the cathode-side gas-liquid separator 300 may be provided at the rear end of the cathode chamber electrolyte accommodating unit 420 of the electrolyte correction unit along the cathode circulation line 350 and at the front end of the cathode chamber 150 of the electrolyzer.
- the anode circulation line 250 includes a second anode recovery pipe 211 that communicates with the anode chamber 130 and the anode chamber electrolyte accommodating part 410 , and the anode chamber electrolyte accommodating part 410 .
- a second anode electrolyte recovery pipe 231 communicating with the anode side gas-liquid separator 200 and a second anode cathode electrolyte solution supply pipe 441 communicating with the anode side gas-liquid separator 200 and the anode chamber 130 to be divided into can
- the cathode circulation line 350 includes a second cathode recovery pipe 311 communicating the cathode chamber 150 and the cathode chamber electrolyte accommodating part 420 , the cathode chamber electrolyte accommodating part 420 and the cathode side gas-liquid separator 300 .
- the anode chamber electrolyte accommodating part 410 communicates with the anode chamber 130 through the second anode recovery tube 211 , and receives the electrolyte and oxygen gas discharged from the anode chamber 130 .
- the cathode chamber electrolyte accommodating part 420 communicates with the cathode chamber 150 through the second cathode recovery tube 311 , and receives the electrolyte and hydrogen gas discharged from the cathode chamber 150 .
- the electrolyte correction unit 400 exchanges ions of the electrolyte in the anode chamber electrolyte accommodating part 410 with the electrolyte in the cathode chamber electrolyte accommodating part 420 through the diaphragm 500 .
- the anode chamber electrolyte accommodating part 410 communicates with the anode-side gas-liquid separator 200 through a second anode electrolyte recovery pipe 231 , and the cathode chamber electrolyte accommodating part 420 includes a second cathode electrolyte recovery pipe 331 . ) through the cathode side gas-liquid separator 300.
- the electrolyte present in the liquid phase of the anode-side gas-liquid separator 200 and the cathode-side gas-liquid separator 300 is passed through the second anode electrolyte supply pipe 441 and the second cathode electrolyte supply pipe 451 to the anode of the electrolytic cell 100, respectively. It is supplied to the chamber 130 and the cathode chamber 150 .
- the embodiment according to FIG. 2 and the embodiment according to FIG. 3 only have a difference depending on whether the positions of the anode-side gas-liquid separator 200 and the cathode-side gas-liquid separator 300 are the front end or the rear end of the electrolytic cell, and the electrolyte correction unit ( 400) has a common main role and structure, and the above-mentioned main contents may be equally applied.
- the electrolyte according to the present invention may use KOH, and the concentration of the electrolyte may be 20 to 50%, but is not limited thereto.
- the operating conditions are not particularly limited, but, for example, the temperature of the electrolyte may be 30° C. to 200° C., the current density of the electrolytic cell may be 1 kA/m 2 to 50 kA/m 2 , and the pressure of the electrolytic cell may be 0.1 Mpa to 20 Mpa.
- an electrolytic cell 100 including an anode chamber 130 and a cathode chamber 150 separated by a partition wall 110 , the anode chamber 130 and the anode recovery tube
- the anode side gas-liquid separator 200 communicating through 210, the cathode side gas-liquid separator 300 communicating with the cathode chamber 150 and the cathode recovery tube 310 through the cathode recovery tube 310, and the anode side gas-liquid separator 200 and
- the anode chamber electrolyte accommodating part 410 and the cathode chamber electrolyte accommodating part ( 420), and a diaphragm 500 is provided inside the electrolyte correction unit 400, and the electrolyte is supplied to the anode chamber and the cathode chamber of the electrolytic cell 100 through the anode electrolyte supply pipe 440 and the cathode electrolyte supply pipe 450.
- a circulation pump 600 may be provided in the positive electroly
- an aqueous KOH solution may be used as the electrolyte.
- the electrolytic solution having a molar concentration of x is supplied from the electrolytic solution correcting unit 400 , and the following reaction occurs.
- hydroxide ions (OH ⁇ ) are consumed and oxygen gas is generated
- hydroxide ions (OH ⁇ ) are generated and hydrogen gas is generated. Accordingly, the molar concentration of the electrolyte discharged from the anode chamber becomes (xa) moles, and oxygen gas is dissolved therein. In addition, the molar concentration of the electrolyte discharged from the cathode chamber becomes (x+a) mole, and hydrogen gas is dissolved therein.
- the electrolyte discharged from the anode chamber 130 and the cathode chamber 150 moves to the anode-side gas-liquid separator 200 and the cathode-side gas-liquid separator 300 through the anode recovery tube 210 and the cathode recovery tube 310 . .
- the dissolved oxygen gas in the electrolyte is in a gas phase region and the electrolyte is in a liquid phase region, and an oxygen gas discharge pipe 220 for discharging the oxygen gas to the outside of the system is provided in the gas phase region.
- the electrolyte present in the liquid phase is introduced into the anode chamber electrolyte accommodating part 410 of the electrolyte correction part 400 through the anode electrolyte recovery pipe 230 .
- the dissolved hydrogen gas in the electrolyte is in a gas phase region and the electrolyte is in a liquid phase region, and a hydrogen gas discharge pipe 320 for discharging the hydrogen gas to the outside of the system is provided in the gas phase region can
- the electrolyte present in the liquid phase is introduced into the cathode chamber electrolyte accommodating part 420 of the electrolyte correction part 400 through the anode electrolyte recovery pipe 330 .
- oxygen and hydrogen gas are partially dissolved in the electrolyte present in the liquid phase region.
- the electrolyte compensating unit 400 is introduced through (x-a) moles of electrolyte introduced through the positive electrolyte recovery pipe 230 by the diaphragm 500 and the negative electrolyte recovery pipe 330 .
- (x + a) mole of the electrolyte is supplied to the anode chamber electrolyte accommodating part 410 and the cathode chamber electrolyte accommodating part 420, respectively.
- the diaphragm 500 uses an ion-permeable diaphragm to pass ions and block the permeation of hydrogen gas and oxygen gas generated in the electrolytic cell.
- the diaphragm has a plurality of fine through-pores, has a structure capable of permeating an electrolyte, and has a gas barrier property to prevent permeation of hydrogen gas and oxygen gas dissolved in the electrolyte.
- (x+a) moles of electrolyte introduced through the cathode electrolyte recovery pipe 330 has a higher concentration than (x-a) moles of electrolyte introduced through the anode electrolyte recovery pipe 230, so the anode electrolyte recovery pipe
- the ions of the electrolyte introduced through the diaphragm move to the electrolyte introduced through the anode electrolyte recovery pipe 230 through the diaphragm, and accordingly, the concentration gradient of the electrolyte in the electrolyte correction unit 400 divided by the diaphragm disappears.
- the electrolyte correction unit 400 prevents mixing of oxygen gas and hydrogen gas by the diaphragm 500 , the risk of explosion due to the concentration of hydrogen gas in the oxygen gas being formed above the explosive range can be prevented. .
- Embodiment 1-2 is configured in the same manner as in Embodiment 1-1, except that a plurality of porous diaphragms are provided in the electrolytic cell compensating unit 400 .
- the electrolyte correction unit 400 generates n+1 electrolyte accommodating parts by the n plurality of porous diaphragms, and the n+1 electrolyte accommodating part has (x-a) moles flowing from the anode-side gas-liquid separator 200 . Electrolyte and (x+a) moles of electrolyte flowing from the cathode-side gas-liquid separator 300 are alternately introduced.
- the positive electrolyte supply pipe 440 and the negative electrolyte supply pipe 450 for supplying the electrolyte from the electrolyte correction unit 400 to the electrolytic cell 100 may be formed as one each, and may be provided inside for a smooth supply to the electrolyte receiving unit. It can have branches (manifolds).
- the positive electrolyte supply pipe 440 and the negative electrolyte supply pipe 450 may be formed in plurality to correspond to the n+1 number of electrolyte receiving units.
- Embodiment 1-3 is configured in the same manner as in Embodiment 1-1, except that a cation exchange membrane 510 rather than a porous diaphragm is used in the electrolytic cell correction unit 400 .
- the cation exchange membrane 510 selectively transmits only cations in the electrolyte and has gas barrier properties.
- the cations (ie, K + ions) of (x + a) moles of the electrolyte in the cathode chamber electrolyte accommodating unit 420 introduced from the cathode side gas-liquid separator 300 have a concentration gradient. moves to (xa) moles of electrolyte in the anode chamber electrolyte accommodating part 410 introduced from the adjacent anode gas-liquid separator 200 through the cation exchange membrane. Thereafter, in order to balance the ions, anions may move through the membrane, despite the cation exchange membrane having cation selectivity.
- anions that is, OH ⁇ ions
- anions that is, OH ⁇ ions
- (x+a) moles of electrolyte in the cathode chamber electrolyte accommodation unit 420 are adjacent to each other through the cation exchange membrane, and (xa) moles of electrolyte in the anode chamber electrolyte accommodation portion 410 . move to Accordingly, the concentration of the electrolyte finally discharged from the electrolyte correction unit 400 becomes x moles.
- Embodiment 1-4 has the same configuration as Embodiment 1-3 except that a plurality of cation exchange membranes 510 are provided in the electrolytic cell correction unit 400 .
- the cation exchange membrane selectively transmits only cations in the electrolyte and has gas barrier properties.
- n+1 electrolyte receiving units are generated by the n plurality of cation exchange membranes, and (x-a) moles flowing from the anode-side gas-liquid separator 200 to the n+1 electrolyte receiving units are generated. Electrolyte and (x+a) moles of electrolyte flowing from the cathode-side gas-liquid separator 300 are alternately introduced.
- the cations (ie, K + ions) of (x + a) moles of the electrolyte in the cathode chamber electrolyte accommodating unit 420 introduced from the cathode side gas-liquid separator 300 have a concentration gradient. moves to (xa) moles of electrolyte in the anode chamber electrolyte accommodating part 410 introduced from the adjacent anode gas-liquid separator 200 through the cation exchange membrane. Thereafter, in order to balance the ions, anions may move through the membrane, despite the cation exchange membrane having cation selectivity.
- anions that is, OH - ions
- anions that is, OH - ions
- concentration of the electrolyte finally discharged from the electrolyte correction unit 400 becomes x mole.
- the positive electrolyte supply pipe 440 and the negative electrolyte supply pipe 450 for supplying electrolyte from the electrolyte correction unit 400 to the electrolytic cell 100 may be formed as one each, or the positive electrolyte supply pipe 440 and the negative electrode
- the electrolyte supply pipe 450 may be formed in plurality to correspond to the n+1 number of electrolyte accommodating parts.
- anode electrolyte recovery pipe 230 and the cathode electrolyte recovery pipe 330 for supplying electrolyte from the anode gas-liquid separator 200 and the cathode gas-liquid separator 300 to the electrolyte correction unit 400 are each formed as one
- the anode electrolyte recovery tube 230 and the cathode electrolyte recovery tube 330 may be formed in plurality to correspond to the n+1 number of electrolyte receivers.
- the electrolyte correction unit may have a branch (manifold) for smooth supply and discharge of the electrolyte.
- the cation exchange membrane 510 has a gas barrier property, mixing of oxygen gas and hydrogen gas is prevented, and the concentration of hydrogen gas in the oxygen gas and the concentration of oxygen gas in the hydrogen gas are formed above the explosive range and explode. risk can be avoided.
- Embodiment 1-5 is configured in the same manner as in Embodiment 1-1, except that an anion exchange membrane 520 rather than a porous membrane is used in the electrolytic cell compensating unit 400 .
- the anion exchange membrane 520 selectively transmits only anions in the electrolyte and has gas barrier properties.
- anions that is, OH - ions
- anions that is, OH - ions
- the electrolyte of (x + a) moles flowing in from the cathode-side gas-liquid separator 300 pass through the anion exchange membrane 520 by the concentration gradient. It moves to the electrolyte of (xa) moles flowing in from the adjacent anode-side gas-liquid separator 200 . Thereafter, in order to balance the ions, cations may move through the membrane despite the anion selectivity of the anion exchange membrane.
- Embodiment 1-6 is configured in the same manner as in Embodiment 1-5, except that a plurality of anion exchange membranes 520 are provided in the electrolyzer correction unit 400 .
- the anion exchange membrane 520 selectively transmits only anions in the electrolyte and has gas barrier properties.
- n+1 electrolyte inflow spaces are generated by the n plurality of anion exchange membranes, and (x-a) moles flowing in from the anode-side gas-liquid separator 200 in the n+1 electrolyte inflow spaces of the electrolyte and the electrolyte of (x + a) moles flowing from the cathode-side gas-liquid separator 300 are alternately introduced.
- anions (ie, OH ⁇ ions) of (x + a) moles of the electrolyte flowing in from the cathode-side gas-liquid separator 300 are adjacent anodes through the anion exchange membrane due to the concentration gradient. It moves to the electrolyte of (xa) moles flowing in from the side gas-liquid separator 200 . Thereafter, in order to balance the ions, cations may move through the membrane despite the anion selectivity of the anion exchange membrane.
- the positive electrolyte supply pipe 440 and the negative electrolyte supply pipe 450 for supplying electrolyte from the electrolyte correction unit 400 to the electrolytic cell 100 may be formed as one each, or the positive electrolyte supply pipe 440 and the negative electrode
- the electrolyte supply pipe 450 may be formed in plurality to correspond to the n+1 number of electrolyte accommodating parts.
- anode electrolyte recovery pipe 230 and the cathode electrolyte recovery pipe 330 for supplying electrolyte from the anode gas-liquid separator 200 and the cathode gas-liquid separator 300 to the electrolyte correction unit 400 are each formed as one
- the anode electrolyte recovery tube 230 and the cathode electrolyte recovery tube 330 may be formed in plurality to correspond to the n+1 number of electrolyte receivers.
- the electrolyte correction unit may have a branch (manifold) for smooth supply and discharge of the electrolyte.
- anion exchange membrane 520 has a gas barrier property, mixing of oxygen gas and hydrogen gas is prevented, and the concentration of hydrogen gas in the oxygen gas and the concentration of oxygen gas in the hydrogen gas are formed above the explosive range and explode. risk can be avoided.
- a plurality of cation exchange membranes 510 and a plurality of anion exchange membranes 520 are alternately provided in the electrolytic cell correction unit 400 .
- the cation exchange membrane selectively permeates only the cations in the electrolyte
- the anion exchange membrane selectively permeates only the anions in the electrolyte.
- the electrolyte correction unit 400 generates n+1 electrolyte accommodating units by the plurality of n cation exchange membranes 510 and anion exchange membranes 520 , and the anode-side gas-liquid separator 200 is provided in the n+1 electrolyte accommodating units. ) of (x-a) moles of electrolyte and (x+a) moles of electrolyte flowing from the cathode-side gas-liquid separator 300 are alternately introduced.
- the negative ions (ie, OH ⁇ ions) of the (x + a) moles of the electrolyte in the cathode chamber electrolyte accommodating unit 420 introduced from the cathode side gas-liquid separator 300 have a concentration gradient. moves to (xa) moles of electrolyte in the anode chamber electrolyte accommodating part 410 introduced from the adjacent anode gas-liquid separator 200 through the anion exchange membrane 520 .
- cations (ie, K + ions) of (x + a) moles of the electrolyte in the cathode chamber electrolyte accommodating part 420 are (xa) in the anode chamber electrolyte accommodating part 410 adjacent through the cation exchange membrane 510 . moves to moles of electrolyte. Accordingly, the concentration of the electrolyte finally discharged from the electrolyte correction unit 400 becomes x moles.
- the positive electrolyte supply pipe 440 and the negative electrolyte supply pipe 450 for supplying electrolyte from the electrolyte correction unit 400 to the electrolytic cell 100 may be formed as one each, or the positive electrolyte supply pipe 440 and the negative electrode
- the electrolyte supply pipe 450 may be formed in plurality to correspond to the n+1 number of electrolyte accommodating parts.
- anode electrolyte recovery pipe 230 and the cathode electrolyte recovery pipe 330 for supplying electrolyte from the anode gas-liquid separator 200 and the cathode gas-liquid separator 300 to the electrolyte correction unit 400 are each formed as one
- the anode electrolyte recovery tube 230 and the cathode electrolyte recovery tube 330 may be formed in plurality to correspond to the n+1 number of electrolyte receivers.
- a branch (manifold) may be provided for smooth supply and discharge of the electrolyte.
- the cation exchange membrane 510 has a gas barrier property, mixing of oxygen gas and hydrogen gas is prevented, and the concentration of hydrogen gas in the oxygen gas and the concentration of oxygen gas in the hydrogen gas are formed above the explosive range and explode. risk can be avoided.
- the 1-8th embodiment is configured the same as the 1-7th embodiment except that electrodes are provided at both ends of the electrolytic cell compensating unit 400 .
- An anode 460 and a cathode 470 are provided at both ends of the electrolytic cell compensating unit 400 .
- the electrolyte in the electrolyzer compensator 400 moves through the cation exchange membrane 510 and the anion exchange membrane 520 .
- the cation exchange membrane 510 is positioned on the side adjacent to the anode of the anode chamber electrolyte accommodating part 410
- the anion exchange membrane 520 is positioned on the side adjacent to the cathode, and adjacent to the anode of the cathode chamber electrolyte accommodating part 420 .
- An anion exchange membrane 520 is positioned on the side
- a cation exchange membrane 510 is positioned on a side adjacent to the cathode.
- an electrolytic cell 100 including an anode chamber 130 and a cathode chamber 150 separated by a partition wall 110 , the anode chamber 130 and the second anode chamber
- the anode chamber electrolyte accommodating part 410 of the electrolyte correction part 400 communicating through the recovery tube 211, and the electrolyte correction part 400 communicating with the cathode chamber 150 and the second cathode recovery tube 311
- the cathode chamber electrolyte accommodating part 420 and the electrolyte compensating part 400 the anode chamber electrolyte accommodating part 410 and the cathode chamber electrolyte accommodating part 420 are separated by a diaphragm 500
- the anode side gas-liquid separator 200 and the cathode side gas-liquid in communication with the receiving unit 410 and the cathode chamber electrolyte receiving unit 420 through the second anode electrolyte recovery pipe 231 and the second cathode electrolyte recovery
- an aqueous KOH solution may be used as the electrolyte.
- the electrolytic solution having a molar concentration of x is supplied from the electrolytic solution correcting unit 400 , and the following reaction occurs.
- hydroxide ions (OH ⁇ ) are consumed and oxygen gas is generated
- hydroxide ions (OH ⁇ ) are generated and hydrogen gas is generated. Accordingly, the molar concentration of the electrolyte discharged from the anode chamber becomes (xa) moles, and oxygen gas is dissolved therein. In addition, the molar concentration of the electrolyte discharged from the cathode chamber becomes (x+a) mole, and hydrogen gas is dissolved therein.
- the electrolyte discharged from the anode chamber 130 and the cathode chamber 150 passes through the second anode recovery tube 211 and the second cathode recovery tube 311 to the anode chamber electrolyte receiving unit 410 of the electrolyte correction unit 400 . ) and moves to the cathode chamber electrolyte accommodating part 420 .
- Oxygen gas and hydrogen gas are dissolved in the electrolyte flowing into the electrolyte correction unit 400 through the second anode recovery pipe 211 and the second cathode recovery pipe 311 , respectively.
- the oxygen gas and hydrogen gas and the electrolyte discharged from the electrolytic cell are before passing through the anode-side gas-liquid separator 200 and the cathode-side gas-liquid separator 300 , it is relatively As a result, high concentrations of oxygen gas and hydrogen gas are dissolved.
- the electrolyte compensating unit 400 collects (x-a) moles of electrolyte and the second cathode recovery pipe 311 flowing through the second anode recovery pipe 211 through the diaphragm 500 .
- (x + a) moles of electrolyte introduced through the anode chamber are supplied to the electrolyte accommodating part 410 and the cathode chamber electrolyte accommodating part 420, respectively.
- the diaphragm 500 uses an ion-permeable diaphragm to pass ions and isolate hydrogen gas and oxygen gas generated in the electrolytic cell.
- the diaphragm has a plurality of fine through-pores, has a structure capable of permeating an electrolyte, and has a gas barrier property to prevent permeation of hydrogen gas and oxygen gas dissolved in the electrolyte.
- the (x+a) mole of the electrolyte in the cathode chamber electrolyte accommodating part 420 introduced through the second cathode recovery pipe 311 is transferred to the anode chamber electrolyte accommodating part ( 410), since the concentration is higher than that of the (x-a) mole of the electrolyte, the ions of the electrolyte in the cathode chamber electrolyte accommodating part 420 move to the electrolyte in the anode chamber electrolyte accommodating part 410 through the diaphragm, and accordingly, the diaphragm
- the concentration gradient of the electrolyte in the electrolyte correction unit divided by disappears.
- the electrolyte correction unit 400 prevents mixing of oxygen gas and hydrogen gas by the diaphragm 500 , the risk of explosion due to the concentration of hydrogen gas in the oxygen gas being formed above the explosive range can be prevented. .
- the dissolved oxygen gas in the electrolyte is in a gas phase region and the electrolyte is in a liquid phase region, and an oxygen gas discharge pipe 220 for discharging the oxygen gas to the outside of the system is provided in the gas phase region.
- an oxygen gas discharge pipe 220 for discharging the oxygen gas to the outside of the system is provided in the gas phase region.
- the electrolyte present in the liquid phase is introduced into the anode chamber 130 of the electrolytic cell 100 through the second anode electrolyte supply pipe 441 .
- the dissolved hydrogen gas in the electrolyte is in a gas phase region and the electrolyte is in a liquid phase region, and a hydrogen gas discharge pipe 320 for discharging the hydrogen gas to the outside of the system is provided in the gas phase region can
- the electrolyte existing in the liquid phase is introduced into the cathode chamber 150 of the electrolytic cell 100 through the second anode electrolyte supply pipe 451 .
- the 2-2 embodiment it is configured in the same manner as in the 2-1 embodiment, except that a plurality of porous diaphragms are provided in the electrolytic cell compensating unit 400 .
- n+1 electrolyte accommodating units are generated by the n plurality of porous diaphragms, and the n+1 electrolyte accommodating units have (x-a) moles of electrolyte flowing from the anode chamber 130 and (x+a) moles of electrolyte flowing in from the cathode chamber 150 are alternately introduced.
- the second anode electrolyte recovery pipe 231 and the second cathode electrolyte recovery pipe 331 for supplying electrolyte from the electrolyte correction unit 400 to the anode gas-liquid separator 200 and the cathode gas-liquid separator 300 are Each may be formed as one, and may have a branch (manifold) therein for smooth supply to the electrolyte accommodating part. In addition, it may be formed in plurality to correspond to the n+1 number of electrolyte accommodating parts.
- a cation exchange membrane 510 not a porous diaphragm, is used in the electrolytic cell correction unit 400 .
- the cation exchange membrane 510 selectively transmits only cations in the electrolyte and has gas barrier properties.
- cations (ie, K + ions) of (x + a) moles of the electrolyte in the cathode chamber electrolyte accommodating unit 420 introduced from the cathode chamber 150 are generated by the concentration gradient. It moves to (xa) mole of electrolyte in the anode chamber electrolyte accommodating part 410 introduced from the anode chamber 130 adjacent through the cation exchange membrane. Thereafter, in order to balance the ions, anions may move through the membrane, despite the cation exchange membrane having cation selectivity.
- anions that is, OH ⁇ ions
- anions that is, OH ⁇ ions
- (x+a) moles of electrolyte in the cathode chamber electrolyte accommodation unit 420 are adjacent to each other through the cation exchange membrane, and (xa) moles of electrolyte in the anode chamber electrolyte accommodation portion 410 . move to Accordingly, the concentration of the electrolyte finally discharged from the electrolyte correction unit 400 becomes x moles.
- Embodiment 2-4 has the same configuration as in Embodiment 2-3, except that a plurality of cation exchange membranes 510 are provided in the electrolytic cell correction unit 400 .
- the cation exchange membrane selectively transmits only cations in the electrolyte and has gas barrier properties.
- n+1 electrolyte accommodating units are generated by the n plurality of cation exchange membranes, and (x-a) moles of electrolyte introduced from the anode chamber 130 and the n+1 electrolyte accommodating units (x+a) moles of electrolyte flowing in from the cathode chamber 150 are alternately introduced.
- cations (ie, K + ions) of (x + a) moles of the electrolyte in the cathode chamber electrolyte accommodating unit 420 introduced from the cathode chamber 150 are generated by the concentration gradient. It moves to (xa) mole of electrolyte in the anode chamber electrolyte accommodating part 410 introduced from the anode chamber 130 adjacent through the cation exchange membrane. Thereafter, in order to balance the ions, anions may move through the membrane, despite the cation exchange membrane having cation selectivity.
- the second anode electrolyte recovery pipe 231 and the second cathode electrolyte recovery pipe 331 for supplying electrolyte from the electrolyte correction unit 400 to the anode gas-liquid separator 200 and the cathode gas-liquid separator 300 are Each may be formed as one, or the second anode electrolyte recovery tube 231 and the second anode electrolyte recovery tube 331 may be formed in plurality to correspond to the n+1 number of electrolyte receivers.
- a second anode recovery pipe 211 and a second anode recovery tube 211 for supplying electrolyte from the electrolytic cell 100 to the electrolyte correction unit 400 for supplying electrolyte to the pole-side gas-liquid separator 200 and the cathode-side gas-liquid separator 300 for supplying the electrolyte
- Each of the cathode recovery tubes 311 may be formed as one, or the second anode recovery tube 211 and the second cathode recovery tube 311 may be formed in plurality to correspond to the n+1 number of electrolyte accommodating units. .
- the electrolyte correction unit may have a branch (manifold) for smooth supply and discharge of the electrolyte.
- the cation exchange membrane 510 has a gas barrier property, mixing of oxygen gas and hydrogen gas is prevented, and the concentration of hydrogen gas in the oxygen gas and the concentration of oxygen gas in the hydrogen gas are formed above the explosive range and explode. risk can be avoided.
- the 2-5th embodiment it is configured in the same manner as in the 2-1 embodiment, except that an anion exchange membrane 520 rather than a porous diaphragm is used in the electrolytic cell compensating unit 400 .
- the anion exchange membrane 520 selectively transmits only anions in the electrolyte and has gas barrier properties.
- anions that is, OH ⁇ ions
- anions that is, OH ⁇ ions
- (x + a) moles of the electrolyte in the cathode chamber electrolyte accommodating unit 420 introduced from the cathode chamber 150 are generated by the concentration gradient. It moves to (xa) moles of electrolyte in the anode chamber electrolyte accommodating part 410 flowing in from the anode chamber 130 adjacent through the anion exchange membrane. Thereafter, in order to balance the ions, cations may move through the membrane despite the anion selectivity of the anion exchange membrane.
- Embodiment 2-6 is configured in the same manner as in embodiment 2-5, except that a plurality of anion exchange membranes 520 are provided in the electrolyzer correction unit 400 .
- the anion exchange membrane 520 selectively transmits only anions in the electrolyte and has gas barrier properties.
- n+1 electrolyte accommodating units are generated by the n plurality of anion exchange membranes, and (x-a) moles of electrolyte flowing in from the anode chamber 130 and the n+1 electrolyte accommodating units are (x+a) moles of electrolyte flowing in from the cathode chamber 150 are alternately introduced.
- anions that is, OH ⁇ ions
- anions that is, OH ⁇ ions
- (x + a) moles of the electrolyte in the cathode chamber electrolyte accommodating unit 420 introduced from the cathode chamber 150 are generated by the concentration gradient. It moves to (xa) moles of electrolyte in the anode chamber electrolyte accommodating part 410 flowing in from the anode chamber 130 adjacent through the anion exchange membrane. Thereafter, in order to balance the ions, cations may move through the membrane despite the anion selectivity of the anion exchange membrane.
- the second anode electrolyte recovery pipe 231 and the second cathode electrolyte recovery pipe 331 for supplying electrolyte from the electrolyte correction unit 400 to the anode gas-liquid separator 200 and the cathode gas-liquid separator 300 are Each may be formed as one, or the second anode electrolyte recovery tube 231 and the second anode electrolyte recovery tube 331 may be formed in plurality to correspond to the n+1 number of electrolyte receivers.
- a second anode recovery pipe 211 and a second anode recovery tube 211 for supplying electrolyte from the electrolytic cell 100 to the electrolyte correction unit 400 for supplying electrolyte to the pole-side gas-liquid separator 200 and the cathode-side gas-liquid separator 300 for supplying the electrolyte
- Each of the cathode recovery tubes 311 may be formed as one, or the second anode recovery tube 211 and the second cathode recovery tube 311 may be formed in plurality to correspond to the n+1 number of electrolyte accommodating units. .
- the electrolyte correction unit may have a branch (manifold) for smooth supply and discharge of the electrolyte.
- anion exchange membrane 520 has a gas barrier property, mixing of oxygen gas and hydrogen gas is prevented, and the concentration of hydrogen gas in the oxygen gas and the concentration of oxygen gas in the hydrogen gas are formed above the explosive range and explode. risk can be avoided.
- a plurality of cation exchange membranes 510 and a plurality of anion exchange membranes 520 are alternately provided in the electrolytic cell correction unit 400 .
- the cation exchange membrane selectively permeates only the cations in the electrolyte
- the anion exchange membrane selectively permeates only the anions in the electrolyte.
- the electrolyte correction unit 400 generates n+1 electrolyte accommodation units by the plurality of n number of cation exchange membranes 510 and n number of anion exchange membranes 520 , and the n+1 number of electrolyte accommodation units has an anode chamber. (x-a) moles of electrolyte flowing in from 130 and (x+a) moles of electrolyte flowing in from the cathode chamber 150 are alternately introduced.
- anions that is, OH ⁇ ions
- anions that is, OH ⁇ ions
- the second anode electrolyte recovery pipe 231 and the second cathode electrolyte recovery pipe 331 for supplying electrolyte from the electrolyte correction unit 400 to the anode gas-liquid separator 200 and the cathode gas-liquid separator 300 are Each may be formed as one, or the second anode electrolyte recovery tube 231 and the second anode electrolyte recovery tube 331 may be formed in plurality to correspond to the n+1 number of electrolyte receivers.
- a second anode recovery pipe 211 and a second anode recovery tube 211 for supplying electrolyte from the electrolytic cell 100 to the electrolyte correction unit 400 for supplying electrolyte to the pole-side gas-liquid separator 200 and the cathode-side gas-liquid separator 300 for supplying the electrolyte
- Each of the cathode recovery tubes 311 may be formed as one, or the second anode recovery tube 211 and the second cathode recovery tube 311 may be formed in plurality to correspond to the n+1 number of electrolyte accommodating units. .
- the electrolyte correction unit may have a branch (manifold) for smooth supply and discharge of the electrolyte.
- anion exchange membrane 520 has a gas barrier property, mixing of oxygen gas and hydrogen gas is prevented, and the concentration of hydrogen gas in the oxygen gas and the concentration of oxygen gas in the hydrogen gas are formed above the explosive range and explode. risk can be avoided.
- the 2-8th embodiment is configured the same as the 2-7th embodiment except that electrodes are provided at both ends of the electrolytic cell compensating unit 400 .
- An anode 460 and a cathode 470 are provided at both ends of the electrolytic cell compensating unit 400 .
- the electrolyte in the electrolyzer compensator 400 moves through the cation exchange membrane 510 and the anion exchange membrane 520 .
- the cation exchange membrane 510 is positioned on the side adjacent to the anode 460 of the anode chamber electrolyte receiver, the anion exchange membrane 520 is positioned on the side adjacent to the cathode 470, and on the side adjacent to the anode of the cathode chamber electrolyte receiver An anion exchange membrane 520 is positioned, and a cation exchange membrane 510 is positioned on a side adjacent to the cathode.
- the present invention prevents the gas composition in the gas phase region of the water electrolysis device from reaching the explosion limit by including an electrolyte correction unit including a diaphragm for removing the concentration difference between the electrolyte and the electrolyte discharged from the anode chamber and the cathode Even when the electrolyte discharged from the chamber is circulated independently, there is no difference in the concentration of the electrolyte, so an additional device is not required to solve this problem, and the problem of deterioration of fairness due to electrolyte re-injection and operation stabilization can be solved. there is an effect
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Abstract
Description
Claims (13)
- 격벽으로 구분된 양극실 및 음극실을 포함하는 전해조;양극실 전해액 수용부 및 음극실 전해액 수용부를 포함하고, 상기 양극실 전해액 수용부 및 상기 음극실 전해액 수용부는 격막에 의해 구분된 전해액 보정부;상기 전해조의 양극실 및 상기 전해액 보정부의 양극실 전해액 수용부를 연통하는 양극 순환라인; 및상기 전해조의 음극실 및 상기 전해액 보정부의 음극실 전해액 수용부를 연통하는 음극 순환라인을 포함하는 수전해 장치.
- 제1항에 있어서,상기 양극 순환라인에 구비되는 양극측 기액분리기; 및상기 음극 순환라인에 구비되는 음극측 기액분리기를 더 포함하는 수전해 장치.
- 제2항에 있어서,상기 양극측 기액분리기는 양극 순환라인을 따라 전해조의 양극실의 후단 및 전해액 보정부의 양극실 전해액 수용부의 전단에 구비되고,상기 음극측 기액분리기는 음극 순환라인을 따라 전해조의 음극실의 후단 및 전해액 보정부의 음극실 전해액 수용부의 전단에 구비되는 수전해 장치.
- 제2항에 있어서,상기 양극측 기액분리기는 양극 순환라인을 따라 전해액 보정부의 양극실 전해액 수용부의 후단 및 전해조의 양극실의 전단에 구비되고,상기 음극측 기액분리기는 음극 순환라인을 따라 전해액 보정부의 음극실 전해액 수용부의 후단 및 전해조의 음극실의 전단에 구비되는 수전해 장치.
- 제1항에 있어서,격막은 전해액 및 이온은 투과 가능하고,기체는 불투과성인 수전해 장치.
- 제1항에 있어서,격막은 다공막인 수전해 장치.
- 제1항에 있어서,격막은 양이온 교환막 또는 음이온 교환막인 수전해 장치.
- 제1항에 있어서,격막은 복수로 구비되며, 상기 양극실 전해액 수용부 및 상기 음극실 전해액 수용부가 서로 교번하며 배치되는 수전해 장치.
- 제8항에 있어서,양극실 전해액 수용부 및 상기 음극실 전해액 수용부가 서로 교번하며 배치될 때, 수용부가 교번하여 배열되는 방향에 따라 교대로 배치되는 복수의 격막은 양이온 교환막과 음이온 교환막이 교대로 구비되는 것인 수전해 장치.
- 제8항에 있어서,전해액 보정부 내 양단에는 각각 양극 및 음극이 구비되어, 양극과 음극 사이에 격막이 위치하는 수전해 장치.
- 제10항에 있어서,격막은 양이온 교환막 또는 음이온 교환막이고,양극실 전해액 수용부의 양극과 인접한 측면에는 양이온교환막이 위치하고, 음극과 인접한 측면에는 음이온교환막이 위치하며,음극실 전해액 수용부의 양극과 인접한 측면에는 음이온교환막이 위치하고, 음극과 인접한 측면에는 양이온교환막이 위치하는 수전해 장치.
- 제1항에 있어서,전해조의 음극실, 전해액 보정부의 음극실 전해액 수용부 및 음극 순환라인 중 적어도 하나에는 물을 공급하기 위한 물 공급관 및 물 공급 펌프가 더 구비된 수전해 장치.
- 제2항에 있어서,전해조의 음극실, 전해액 보정부의 음극실 전해액 수용부, 음극측 기액분리기 및 음극 순환라인 중 적어도 하나에는 물을 공급하기 위한 물 공급관 및 물 공급 펌프가 더 구비된 수전해 장치.
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EP22746159.7A EP4286559A1 (en) | 2021-02-01 | 2022-01-21 | Water electrolysis device comprising electrolyte correction unit having diaphragm |
JP2023547034A JP2024505276A (ja) | 2021-02-01 | 2022-01-21 | 隔膜が備えられた電解液補正部を含む水電解装置 |
US18/275,095 US20240117504A1 (en) | 2021-02-01 | 2022-01-21 | Water electrolysis device comprising electrolyte correction unit having diaphragm |
CN202280012659.1A CN116783328A (zh) | 2021-02-01 | 2022-01-21 | 包括具有隔膜的电解液校正部的水电解装置 |
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KR1020210014169A KR102468372B1 (ko) | 2021-02-01 | 2021-02-01 | 격막이 구비된 전해액 보정부를 포함하는 수전해 장치 |
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KR20030077910A (ko) * | 2002-03-27 | 2003-10-04 | 하이젠환경테크 (주) | 체류 순환식 전해수 생성 시스템 및 방법 |
JP2012111981A (ja) * | 2010-11-19 | 2012-06-14 | Takasago Thermal Eng Co Ltd | 水素製造方法及び水素製造システム |
JP2017039982A (ja) | 2015-08-20 | 2017-02-23 | デノラ・ペルメレック株式会社 | 電解装置及び電解方法 |
EP3312304A1 (en) * | 2015-06-17 | 2018-04-25 | De Nora Permelec Ltd | Water treatment system using alkaline water electrolysis device and alkaline fuel cell |
JP2019178356A (ja) * | 2018-03-30 | 2019-10-17 | 芝浦メカトロニクス株式会社 | 水素製造装置及び水素製造方法 |
WO2020196835A1 (ja) * | 2019-03-27 | 2020-10-01 | デノラ・ペルメレック株式会社 | 電解生成ガスの精製方法及び電解装置 |
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JP6397396B2 (ja) | 2015-12-28 | 2018-09-26 | デノラ・ペルメレック株式会社 | アルカリ水電解方法 |
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KR20030077910A (ko) * | 2002-03-27 | 2003-10-04 | 하이젠환경테크 (주) | 체류 순환식 전해수 생성 시스템 및 방법 |
JP2012111981A (ja) * | 2010-11-19 | 2012-06-14 | Takasago Thermal Eng Co Ltd | 水素製造方法及び水素製造システム |
EP3312304A1 (en) * | 2015-06-17 | 2018-04-25 | De Nora Permelec Ltd | Water treatment system using alkaline water electrolysis device and alkaline fuel cell |
JP2017039982A (ja) | 2015-08-20 | 2017-02-23 | デノラ・ペルメレック株式会社 | 電解装置及び電解方法 |
JP2019178356A (ja) * | 2018-03-30 | 2019-10-17 | 芝浦メカトロニクス株式会社 | 水素製造装置及び水素製造方法 |
WO2020196835A1 (ja) * | 2019-03-27 | 2020-10-01 | デノラ・ペルメレック株式会社 | 電解生成ガスの精製方法及び電解装置 |
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KR102468372B1 (ko) | 2022-11-18 |
US20240117504A1 (en) | 2024-04-11 |
CN116783328A (zh) | 2023-09-19 |
KR20220111033A (ko) | 2022-08-09 |
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