EP4123053A1 - Procédé de fonctionnement d'une installation d'électrolyse et installation d'électrolyse - Google Patents

Procédé de fonctionnement d'une installation d'électrolyse et installation d'électrolyse Download PDF

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Publication number
EP4123053A1
EP4123053A1 EP21186288.3A EP21186288A EP4123053A1 EP 4123053 A1 EP4123053 A1 EP 4123053A1 EP 21186288 A EP21186288 A EP 21186288A EP 4123053 A1 EP4123053 A1 EP 4123053A1
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EP
European Patent Office
Prior art keywords
gas
hydrogen
inert gas
oxygen
separator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP21186288.3A
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German (de)
English (en)
Inventor
Du-Fhan Choi
Markus Ungerer
Dirk Wall
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Energy Global GmbH and Co KG
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Siemens Energy Global GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Priority to EP21186288.3A priority Critical patent/EP4123053A1/fr
Priority to CN202280050456.1A priority patent/CN117751209A/zh
Priority to EP22728257.1A priority patent/EP4334501A1/fr
Priority to CA3226820A priority patent/CA3226820A1/fr
Priority to AU2022313398A priority patent/AU2022313398A1/en
Priority to PCT/EP2022/062738 priority patent/WO2023001422A1/fr
Publication of EP4123053A1 publication Critical patent/EP4123053A1/fr
Priority to CL2024000143A priority patent/CL2024000143A1/es
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a method for operating an electrolysis plant comprising an electrolyzer for generating hydrogen and oxygen as product gases.
  • the invention further relates to such an electrolysis plant.
  • Hydrogen is nowadays generated, for example, by means of proton exchange membrane (PEM) electrolysis or alkaline electrolysis.
  • PEM proton exchange membrane
  • the electrolyzers use electrical energy to produce hydrogen and oxygen from the water supplied.
  • An electrolyzer generally has a large number of electrolytic cells which are arranged adjacent to one another.
  • water electrolysis water is broken down into hydrogen and oxygen in the electrolysis cells.
  • distilled water is typically fed in as starting material on the anode side and split into hydrogen and oxygen on a proton-permeable membrane (“proton exchange membrane”; PEM).
  • PEM proton-permeable membrane
  • the water is oxidized to oxygen at the anode.
  • the protons pass through the proton-permeable membrane.
  • Hydrogen is produced on the cathode side.
  • the water is generally conveyed from an underside into the anode compartment and/or cathode compartment.
  • electrolysis stack which is made up of several electrolysis cells.
  • electrolysis stack under DC voltage, water is introduced as educt, with two fluid streams consisting of water and gas bubbles (oxygen O 2 or hydrogen H 2 ) emerging after passing through the electrolysis cells.
  • gas separators or gas separators The respective separation of the water and gas phase in the fluid flows takes place in gas separators or gas separators.
  • both product gas streams can be fed to a respective, catalytically activated recombiner in which a catalyst allows the hydrogen to recombine with the oxygen to form water (DeOxo unit).
  • the gas flow must first be heated to at least 80°C so that the conversion rates of the recombiner are sufficiently high and the required gas purity is achieved.
  • the process engineering plant used for this is expensive and, due to its energy requirements, reduces the system efficiency of the entire electrolysis plant. For this reason, attention must be paid to the purity and quality of the product gas streams initially produced in the electrolyser and discharged from the electrolyser, also in order to keep operational safety aspects and the costs and effort for the subsequent cleaning steps within reasonable limits.
  • the purity or quality of the two product gas streams of the gases originally produced in the electrolyzer depends on many parameters and can also change during the operation of an electrolysis system. It is problematic and particularly safety-relevant here on the one hand if the concentration of oxygen in hydrogen increases, but on the other hand also if the concentration of hydrogen in oxygen increases. If a certain concentration limit is exceeded here, especially in the respective gas separator (container) directly downstream of the electrolysis, the oxygen gas produced can no longer be handed over for other purposes, for example. If the proportion of hydrogen in the oxygen product gas continues to rise, a flammable or explosive mixture can even form. A potentially dangerous operating state then prevails in the gas separator (container), which must be avoided at all costs for safety reasons. This also applies correspondingly to the hydrogen side.
  • a reliable and continuous monitoring of the gas quality of the product gases in the operation of the electrolysis plant is essential. This also applies in particular to the oxygen side of the electrolyser, ie the monitoring of the concentration of hydrogen as a foreign gas in the oxygen produced during the electrolysis.
  • the monitoring and corresponding operational management represents an important protective measure in order to recognize critical operating states and to take safety measures up to the temporary shutdown of the electrolysis system.
  • the invention is therefore based on the object of enabling improved operation in terms of safety and system efficiency in an electrolysis system.
  • the object is achieved by a method for operating an electrolysis system for generating hydrogen and oxygen as product gases, in which the oxygen product gas from an electrolyzer, which also contains hydrogen as foreign gas, is fed to a downstream gas separator, with an inert gas being fed to the gas separator when a predetermined limit value for the hydrogen concentration in the oxygen product gas is exceeded, so that the hydrogen concentration in the oxygen product gas is lowered.
  • an electrolysis system comprising an electrolyzer for generating hydrogen and oxygen as product gases, in which the oxygen product gas also contains hydrogen as a foreign gas, the electrolyzer being connected to a gas Separator is connected and the gas separator via a supply line to a gas tank, which is designed to supply an inert gas to the gas separator as required.
  • the invention is based on the knowledge that previous operating concepts for electrolysis systems are complex in terms of system technology with regard to the monitoring and elimination of critical operating states in relation to the quality of the oxygen produced and therefore have significant economic disadvantages.
  • the concentration of hydrogen in the oxygen product gas is usually measured and monitored in the corresponding gas separator in previous operating concepts. If the concentration exceeds a predetermined limit value, the operation of the electrolyzer is stopped. A depressurization is carried out on the gas separator containing the oxygen, i.e. this gas container is completely vented and depressurized. A discard of the oxygen gas and a complete replacement of the gas in the gas tank is required. Due to the depressurization or complete venting on the oxygen side, the entire valuable hydrogen product gas must also be discarded in the corresponding gas separator on the hydrogen side, in particular to counteract the high differential pressure caused by the venting and to avoid system damage across the PEM membrane.
  • the hydrogen product gas is therefore also completely drained from the container volume of the gas separator and any supply lines of the gas system on the hydrogen side.
  • the gas separator is completely vented.
  • the entire gas system, including the gas separators, is then flushed with nitrogen from a storage tank in the nitrogen system of the electrolysis plant using a complex flushing procedure to make it inert.
  • the nitrogen system must be designed with a correspondingly large volume for this safety-relevant need for nitrogen in order to provide sufficient nitrogen.
  • the electrolysis is restarted. Due to the inert gas nitrogen in the gas system, the newly produced hydrogen product gas must first be discarded until the desired gas quality is achieved again.
  • the present invention comes in specifically by reducing a critical foreign gas concentration of hydrogen in the oxygen product gas, which is located in the corresponding gas separator downstream of the electrolyzer, by adding an inert gas of good quality to the oxygen product gas in a targeted and is supplied in a well-dosed manner.
  • the targeted supply causes the gases to mix in the gas separator, which results in a reduction in the hydrogen concentration in the oxygen, with the dilution effect being utilized by the mixing of the gases.
  • the hydrogen concentration is reduced simply because of the effect of intimate gas mixing and dilution of the hydrogen in the oxygen product gas by the addition of inert gas. This effect is used particularly advantageously in the invention.
  • the complex and complete inerting of the gas system, in particular of the gas separator, with nitrogen can be omitted and a nitrogen system that is still required on the electrolysis system can be dimensioned correspondingly smaller.
  • the inert gas is compressed and fed to the gas separator under a working pressure.
  • the compression brings the inert gas to the desired pressure level of the working pressure can therefore be flexibly adapted to the container pressure of the oxygen product gas in the gas separator, depending on the current operating status and mode of operation of the electrolysis system.
  • Flow control elements such as pressure reducers, pressure regulators, control valves or orifices, which are preferably operated via a measuring and control device, can be used to precisely adjust the working pressure to the desired pressure level and to feed the inert gas into the gas separator.
  • the hydrogen concentration in the gas separator is measured.
  • the measurement and monitoring of the hydrogen concentration is carried out using correspondingly sensitive gas sensors, with monitoring and control units for selective gas sensors preferably also being used in order to reliably determine and monitor the hydrogen concentration in the oxygen product gas "in situ". .
  • this applies to the regular operation of the electrolysis system, but advantageously also during the process of lowering the hydrogen concentration in the oxygen product gas below the desired, predetermined, critical limit value.
  • critical operating states in the gas separator are reliably detected and dangerous operating states, in particular with regard to the risk of explosion due to ignitable gas mixtures of hydrogen in the oxygen product gas, can be counteracted at an early stage.
  • the inert gas is preferably taken from a pressurized gas container. Inert gas is therefore introduced under pressure into the pressurized gas container, stored and stored and is kept in sufficient volume for the purposes of dilution as required.
  • the pressurized gas tank therefore acts as a store or storage tank for the inert gas and is dimensioned accordingly.
  • the gas container is preferably charged with inert gas of good quality, ie high purity, ie the inert gas has a low or very low concentration of harmful foreign gas.
  • inert gas of good quality ie high purity, ie the inert gas has a low or very low concentration of harmful foreign gas.
  • water-soluble foreign gas components in the inert gas are to be avoided, since when they are fed into the gas separator, they can dissolve in the process water (educt) for further water electrolysis due to the phase mixture and have a disadvantageous effect on the operation and service life of the electrolysis system, at least in the long term. This is because an exchange of media takes place at the liquid-gas phase boundary in the gas separator. For the stationary state, one can assume that the gas phase of the product gases is completely saturated with water vapor.
  • a corresponding supply of inert gas is stored or kept available in the gas tank.
  • the gas tank is designed as a pressure tank, which is designed according to needs in terms of volume and structurally adapted.
  • the gas tank is advantageously charged with inert gas during normal operation of the electrolyser, ie during the electrochemical decomposition of water into hydrogen and oxygen, so that a supply of inert gas of good quality is kept in the buffer tank. It is also conceivable that during normal operation of the electrolyser the gas tank is continuously flown through, so that a volume is available at all times should the gas quality deteriorate beyond the critical value of a still tolerable hydrogen concentration in the oxygen product gas.
  • the inert gas is compressed and the gas container is charged with the compressed inert gas.
  • a compressor that is oil-free is preferably used to compress the inert gas in order to avoid loading oil-based foreign gas components into the inert gas.
  • the pressure ratio and the compression performance are corresponding customized.
  • the inert gas is advantageously sucked in by the compressor at atmospheric pressure and compressed to the desired pressure level, in particular for charging the gas container.
  • the integration of the gas tank for inert gas for the required supply of inert gas to the gas separator on the oxygen side takes place in the operating concept of the electrolysis system.
  • This gas container is usually under a working pressure and contains inert gas of good quality or high purity with regard to foreign gas components.
  • the inert gas is freed from water-soluble impurities, in particular from carbon dioxide (CO 2 ) or sulfur dioxide (SO 2 ), in a cleaning step.
  • gas purification is preferably carried out before the inert gas is used to reduce the hydrogen concentration in the oxygen product gas gas separator.
  • the cleaning step advantageously ensures that no significant components remain in the air-inert gas that are chemically dissolved in water and/or adversely affect the reactions on the oxygen side of the electrolytic cell.
  • An example of this is carbon dioxide.
  • Other components such as sulfur dioxide, depending on the concentration in the intake air, can play a site-specific role that should be avoided in the inert gas. A suitable purification step is therefore provided for these components.
  • the inert gas is advantageously brought into contact with an adsorbent and/or an absorbent in the cleaning step in such a way that the water-soluble foreign gas components are separated from the inert gas and bound, so that inert gas of high purity is obtained.
  • the design of the cleaning step using adsorption or absorption or a combination of both separation methods is particularly effective in order to separate or separate the foreign gas components from the inert gas.
  • Adsorption is the accumulation of substances from gases or liquids on the surface of a solid, more generally on the interface between two phases. This differs from absorption, in which the substances penetrate into the interior of a solid or a liquid.
  • the inert gas for example based on air, can be obtained with high purity and quality.
  • a PEM electrolyzer is preferably used as the electrolyzer, with a differential pressure between the hydrogen product gas and the oxygen product gas being regulated in such a way that a maximum pressure difference across the proton exchange membrane is not exceeded.
  • the membrane in particular is protected, since the pressure difference between the oxygen side and the hydrogen side is run at a permissible setpoint in order to achieve the highest possible system efficiency and corresponding hydrogen yield with simultaneous operational reliability.
  • the differential pressure can advantageously also continue to be regulated in the invention via existing control valves and control devices for operational management.
  • the pressure levels can therefore be different on the hydrogen side and the oxygen side, as long as a permissible differential pressure is observed with a view to the membrane, which is used for regulation.
  • electrolysers are designed and well suited for operation in differential pressure mode.
  • the hydrogen side can be operated at high pressure, while the oxygen side is simultaneously vented to the atmosphere without pressure.
  • both the hydrogen side and the oxygen side can also be at a respective higher working pressure compared to the atmosphere.
  • the production of hydrogen and oxygen in the electrolyser is stopped, in particular only temporarily.
  • the normal operation of the electrolysis system is thus advantageously only interrupted until the supply of inert gas of good quality and high purity from the gas tank into the oxygen-side gas separator for diluting and lowering the hydrogen concentration below the limit value.
  • the time required for troubleshooting with the accompanying downtime of the electrolyzer for the method according to the invention is advantageously significantly reduced compared to the conventional methods.
  • both the oxygen product gas and the hydrogen product gas are drained off completely, with the respective gas separator being emptied.
  • the gas system is then completely rendered inert with nitrogen and finally the electrolysis system is started up again until the electrolyzer reaches or resumes a normal operating state with good quality of the product gases.
  • air in particular compressed air
  • the inert gas is used as the inert gas.
  • air or compressed air is simply given in an electrolysis system, since electrolysis systems usually already have a compressed air system. Air or compressed air is thus available, in that the compressed air system can advantageously be used to obtain the inert gas. This is also very favorable from an economic point of view. Preference is given to cleaning steps for packaging of the inert gas used for the purpose as described above. In comparison to using the nitrogen system, the integration of the compressed air system into the system concept of the electrolysis system is much cheaper
  • the volume of inert gas, in particular air or compressed air, which is required for flushing to eliminate a potentially dangerous state of high hydrogen concentration in the gas separator, is significantly lower. Since, in addition, a multiple of cleaned compressed air is required for the production of nitrogen in a nitrogen system, the necessary capacity of the compressed air system according to the present invention falls in comparison to an electrolysis system in which nitrogen is used on site for complete inerting of the gas separator used on the oxygen side is significantly lower.
  • the electrolysis system accordingly comprises an electrolyzer for generating hydrogen and oxygen as product gases, in which the oxygen product gas also contains hydrogen as a foreign gas, the electrolyzer being connected to a gas separator via a product flow line for the oxygen product gas and the gas separator via a supply line to a gas tank configured to supply inert gas to the gas separator as needed.
  • the separation of the water and gas phase takes place in the gas separator or gas separator.
  • the gas separator is preferably constructed as a gravity separator, so that the water phase can be removed at the bottom and the gas phase, in this case the oxygen product gas, can be removed at the top.
  • the water column inside the separator also serves as a buffer storage for changing load specifications.
  • a media exchange takes place at the phase boundary in the gas separator.
  • the gas phase of the product gas in this case oxygen product gas
  • a gas separator on the hydrogen side of the electrolysis plant with the phase separation of hydrogen product gas and process water (educt) for the electrolysis.
  • a valve is preferably connected into the supply line, which is designed in particular as a control valve.
  • the design of the valve as a control fitting allows precise dosing of the supply of inert gas to the gas separator on the oxygen side.
  • the valve position of the control valve can advantageously be controlled with a hydraulic or electromechanical valve control or valve control device.
  • a corresponding control and regulation device and sensor devices are preferably integrated into the system concept of the electrolysis system.
  • a cleaning device for the inert gas is preferably connected into the supply line, so that foreign components can be separated from the inert gas.
  • the purification device has an adsorbent and/or an absorbent, by means of which foreign gas components can be adsorbed and/or absorbed from the inert gas.
  • the materials can be chosen accordingly in order to adapt the cleaning device to the requirement.
  • the precipitation or separation of water-soluble foreign gas components in the inert gas or traces of components originally present for example when using air as the inert gas. Adsorption or absorption of carbon monoxide or sulfur dioxide from the air is particularly advantageous here.
  • An adsorbent or adsorbent is used to remove trace substances from the inert gas. The same applies to absorbents or absorbents.
  • the electrolysis system has a compressor to which the gas tank is connected via a line, so that compressed inert gas, in particular compressed air, can be fed to the gas tank.
  • the compressor is preferably designed as an oil-lubricated air compressor, which is followed by an oil filter.
  • the oil filter is designed to be correspondingly efficient in terms of filtering oil components in the compressed air.
  • oil residues as gaseous foreign components in the inert gas, in particular in the compressed air should also generally be avoided as far as possible in order to ensure reliable operation of the electrolysis system with high availability. This can be done in two ways, for example.
  • a corresponding oil filter can advantageously be installed before the compressed air is used for inerting. With the use of such highly efficient oil filters, class 2 oil-freeness can be achieved with very low residual oil quantities of less than 0.1 mg/m 3 .
  • oil-free compressors can also be used so that the compressed air fed to the gas separator is also completely oil-free.
  • the compressor is therefore designed as an oil-free compressor.
  • the electrolysis system 100 has an electrolyzer 1 which is designed as a PEM or alkali electrolyzer.
  • the electrolyzer 1 comprises at least one electrolytic cell, not shown in detail here, for the electrochemical decomposition of water.
  • the electrolysis system 100 also has a nitrogen system 3 which includes a nitrogen tank 5 .
  • a compressor 7 is connected to the nitrogen system 3 to supply the nitrogen system 3 .
  • the nitrogen system 3 is connected to a gas separator 11 via a flushing line 9, so that nitrogen for flushing the gas separator 3 can be taken from the nitrogen container 5 and fed to the gas separator 3 via the flushing line 9 (nitrogen -Inerting).
  • the nitrogen container 3 is dimensioned to have a correspondingly large volume and is pressurized for the nitrogen requirement in the electrolysis system 100 . In addition to other tasks, inerting requires large amounts of nitrogen in the electrolysis system, which are to be kept in the nitrogen tank 5 .
  • a reactant flow of water is introduced into the electrolyzer 1 via a reactant flow line 13 .
  • the water is electrochemically broken down in the electrolyzer 1 into the product gases hydrogen and oxygen, and both product streams are fed out of the electrolyzer 1 separately.
  • the electrolyzer 1 has a product stream line 15, with the help of which a first Product, here oxygen from the electrolysis, is led out.
  • the structure of the electrolysis system 100 described here considers the oxygen product stream.
  • On the hydrogen side there is a corresponding technical structure in the electrolysis system 100, which is shown in FIG FIG 1 is not shown in more detail for reasons of clarity and is not carried out in detail.
  • a product flow line 17 is provided specifically for the outflow of the hydrogen product stream from the electrolyzer 1, with the aid of which a second product, namely the hydrogen obtained from the electrolysis, is routed out.
  • the hydrogen obtained is then in further - in the FIG 1 components of the electrolysis system 100 treated and further processed in terms of process technology, not shown in detail.
  • the electrolyzer 1 On the oxygen side, the electrolyzer 1 is connected to the gas separator 11 via the product flow line 15 .
  • a ventilation line 19 is connected to the gas separator 11, via which the gas separator 11 can be completely emptied by relieving pressure if necessary, so that it is depressurized or under atmospheric pressure.
  • a compressed air system 21 comprising a gas tank 23 and an air compressor 25 is provided, so that the gas tank 23 can be supplied with compressed air from the air compressor 25 via the connecting line 27 .
  • the gas tank 23 can be loaded with compressed air L (compressed air) and stored for other purposes.
  • the compressed air system 21 To supply the nitrogen system 3 with compressed air L, the compressed air system 21 is connected via a supply line 29a.
  • Another consumption unit 31 is supplied with compressed air L via a supply line 29b.
  • FIG 1 oxygen product gas is supplied to the gas separator 11 .
  • the concentration of hydrogen in the oxygen product gas in the gas separator 11 is continuously measured and monitored to measure the quality of the oxygen product gas. If the concentration exceeds a predetermined limit value, the operation of the electrolyzer 1 is stopped and all of the oxygen product gas in the gas separator 11 is discarded.
  • the oxygen product gas is completely drained from the container volume of the gas separator 11 and any supply lines of the oxygen-side gas system. For this purpose, the gas separator 11 is completely vented via the vent line 19 and depressurized.
  • the entire gas system including the gas separator 11 is then flushed with nitrogen from a nitrogen container 5 in the nitrogen system 3 of the electrolysis system 100 by means of a complex and cost-intensive flushing procedure for inerting.
  • the nitrogen system 3 must be designed with a correspondingly large volume for this safety-relevant need for nitrogen in order to provide sufficient nitrogen.
  • the electrolysis is restarted. Due to the flushing of the gas system with nitrogen and in particular in the gas separator 11, the newly produced oxygen product gas must first be discarded until the desired gas quality is achieved again.
  • FIG 2 shows an electrolysis plant 1 with inert gas system according to the invention.
  • the new operating concept of the invention begins with an advantageous integration of the compressed air system 21 and its configuration as an inert gas system which is connected to the gas separator 11 on the oxygen side.
  • the flushing line 9 which connects the nitrogen system 3 to the gas separator 3 to render the entire gas system inert with nitrogen.
  • the compressed air system 21 is connected to the gas separator 11 via the supply line 37 so that compressed air L can be removed from the gas tank 23 if required.
  • the compressed air system 21 has an air compressor 25 and a gas tank 23 which are connected to one another via a connecting line 27 .
  • the air compressor 25 is designed as an oil-free compressor.
  • a cleaning device 33 In the supply line 37, a cleaning device 33 is connected, which has an absorbent and / or an adsorbent.
  • harmful foreign gas components in the compressed air L stored in the gas tank 23 can be removed, and an inert gas with high quality and purity is generated.
  • carbon dioxide and/or sulfur dioxide can be removed from the compressed air L by means of the cleaning device 33 .
  • the thermal energy released by adsorption or absorption can be used for other purposes by cooling the cleaning device 33, for example in a heat exchange process by coupling a heat exchanger.
  • control valve 35 in the supply line 37 connected, the valve position of which can be controlled by a control device, not shown, on the demand and the pressure level of compressed air L for the supply to the gas separator 11 .
  • the supply line 37 opens into the gas separator 11.
  • the foreign gas concentration of hydrogen in the oxygen product gas from the electrolyzer 1 is continuously measured and monitored in the gas separator 11 connected downstream on the oxygen side. If the measured value shows a critical foreign gas concentration above a predetermined limit value for a still permissible hydrogen content in the oxygen product gas in the gas separator 11, the hydrogen concentration is reduced in that the oxygen product gas is treated with cleaned compressed air L of good quality and purity, i.e. with at most very small impurities or harmful foreign gas components is supplied in a targeted and well-dosed manner via the control valve 35. This targeted supply then brings about an intimate mixing of the gases in the gas separator 11, as a result of which a reduction in the hydrogen concentration is achieved.
  • the hydrogen concentration is already reduced because of the effect of the gas phase mixture and the dilution of the hydrogen in the oxygen product gas by metering in pressurized inert gas, in this case compressed air L, which is used particularly advantageously in the invention.
  • pressurized inert gas in this case compressed air L
  • the volume of gas in the container can therefore be used when the electrolyzer 1 is restarted. So if a quality measurement in the gas separator 11 indicates poor quality, the electrolysis process is stopped.
  • a further economic advantage is that the nitrogen system 3 with the proposed system concept FIG 2 for the electrolysis plant 100 compared to the conception FIG 1 can be made much more compact.
  • the corresponding parts of the system, in particular the nitrogen tank 5, can be made smaller.

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EP21186288.3A 2021-07-19 2021-07-19 Procédé de fonctionnement d'une installation d'électrolyse et installation d'électrolyse Withdrawn EP4123053A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP21186288.3A EP4123053A1 (fr) 2021-07-19 2021-07-19 Procédé de fonctionnement d'une installation d'électrolyse et installation d'électrolyse
CN202280050456.1A CN117751209A (zh) 2021-07-19 2022-05-11 用于运行电解设施的方法和电解设施
EP22728257.1A EP4334501A1 (fr) 2021-07-19 2022-05-11 Procédé de mise en oeuvre d'une installation d'électrolyse et installation d'électrolyse
CA3226820A CA3226820A1 (fr) 2021-07-19 2022-05-11 Procede de mise en oeuvre d'une installation d'electrolyse et installation d'electrolyse
AU2022313398A AU2022313398A1 (en) 2021-07-19 2022-05-11 Method for operating an electrolysis plant, and electrolysis plant
PCT/EP2022/062738 WO2023001422A1 (fr) 2021-07-19 2022-05-11 Procédé de mise en œuvre d'une installation d'électrolyse et installation d'électrolyse
CL2024000143A CL2024000143A1 (es) 2021-07-19 2024-01-17 Método para operar una planta de electrólisis, y planta de electrólisis

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EP21186288.3A EP4123053A1 (fr) 2021-07-19 2021-07-19 Procédé de fonctionnement d'une installation d'électrolyse et installation d'électrolyse

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EP4123053A1 true EP4123053A1 (fr) 2023-01-25

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EP22728257.1A Pending EP4334501A1 (fr) 2021-07-19 2022-05-11 Procédé de mise en oeuvre d'une installation d'électrolyse et installation d'électrolyse

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EP (2) EP4123053A1 (fr)
CN (1) CN117751209A (fr)
AU (1) AU2022313398A1 (fr)
CA (1) CA3226820A1 (fr)
CL (1) CL2024000143A1 (fr)
WO (1) WO2023001422A1 (fr)

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EP4357483A1 (fr) * 2022-10-18 2024-04-24 Linde GmbH Procédé et installation de fabrication d'un ou plusieurs produits d'électrolyse

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DE3603244A1 (de) * 1986-02-03 1987-08-06 Ht Hydrotechnik Gmbh Sicherheitsvorrichtung fuer elektrolysezellen
US7285192B2 (en) * 2002-12-14 2007-10-23 GHW Gesellschaft für Hochleistungselektrolyseure zur Wasserstofferzeugung mbH Pressure electrolyzer and method for switching off a pressure electrolyzer
US8557090B2 (en) * 2007-07-11 2013-10-15 Swiss Hydrogen Power Shp Sa High-pressure electrolysis installation and process for inertising an installation of this type
DE102018222388A1 (de) * 2018-12-20 2020-06-25 Robert Bosch Gmbh Verfahren zum Betreiben einer Elektrolyseanlage und Elektrolyseanlage
JP2020193390A (ja) * 2019-05-23 2020-12-03 株式会社神鋼環境ソリューション 水素・酸素発生装置および水素ガスの製造方法

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DE3603244A1 (de) * 1986-02-03 1987-08-06 Ht Hydrotechnik Gmbh Sicherheitsvorrichtung fuer elektrolysezellen
US7285192B2 (en) * 2002-12-14 2007-10-23 GHW Gesellschaft für Hochleistungselektrolyseure zur Wasserstofferzeugung mbH Pressure electrolyzer and method for switching off a pressure electrolyzer
US8557090B2 (en) * 2007-07-11 2013-10-15 Swiss Hydrogen Power Shp Sa High-pressure electrolysis installation and process for inertising an installation of this type
DE102018222388A1 (de) * 2018-12-20 2020-06-25 Robert Bosch Gmbh Verfahren zum Betreiben einer Elektrolyseanlage und Elektrolyseanlage
JP2020193390A (ja) * 2019-05-23 2020-12-03 株式会社神鋼環境ソリューション 水素・酸素発生装置および水素ガスの製造方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4357483A1 (fr) * 2022-10-18 2024-04-24 Linde GmbH Procédé et installation de fabrication d'un ou plusieurs produits d'électrolyse
WO2024083351A2 (fr) 2022-10-18 2024-04-25 Linde Gmbh Procédé et installation de fabrication d'au moins un produit d'électrolyse
WO2024083351A3 (fr) * 2022-10-18 2024-09-19 Linde Gmbh Procédé et installation de fabrication d'au moins un produit d'électrolyse

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EP4334501A1 (fr) 2024-03-13
WO2023001422A1 (fr) 2023-01-26
CL2024000143A1 (es) 2024-08-23
CN117751209A (zh) 2024-03-22
AU2022313398A1 (en) 2024-01-18
CA3226820A1 (fr) 2023-01-26

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