WO2023111174A2 - Water electrolysis hydrogen production device and method for multiple electrolytic cells - Google Patents

Water electrolysis hydrogen production device and method for multiple electrolytic cells Download PDF

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Publication number
WO2023111174A2
WO2023111174A2 PCT/EP2022/086143 EP2022086143W WO2023111174A2 WO 2023111174 A2 WO2023111174 A2 WO 2023111174A2 EP 2022086143 W EP2022086143 W EP 2022086143W WO 2023111174 A2 WO2023111174 A2 WO 2023111174A2
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WIPO (PCT)
Prior art keywords
hydrogen
oxygen
separator
regulating valve
valve
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PCT/EP2022/086143
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French (fr)
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WO2023111174A3 (en
Inventor
Xiaoliang ZHAO
Ping Li
Jun Ma
Shuqin TANG
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John Cockerill Hydrogen Belgium
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Publication of WO2023111174A2 publication Critical patent/WO2023111174A2/en
Publication of WO2023111174A3 publication Critical patent/WO2023111174A3/en

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/70—Assemblies comprising two or more cells
    • 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
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/50—Processes
    • 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
    • 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
    • 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
    • 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
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/60—Constructional parts of cells
    • 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 invention relates to the technical field, of hydrogen production, in particular to a device and a method for producing hydrogen by water electrolysis of multiple electrolytic tanks .
  • the hydrogen production method by water electrolysis is that the electrolyte in the water electrolysis tank is electrolyzed by direct current, hydrogen and oxygen containing liquid are respectively generated at the cathode and the anode , and then are sent to a hydrogen separator and an oxygen separator for gravity separation in two ways , the hydrogen and the oxygen are upwards sent to a gas using point, the electrolyte is downwards , and are collected into a circulating pump by backflow, and are sent to the electrolysis tank again for electrolysis , and the hydrogen and the oxygen are generated in a reciprocating way .
  • the liquid levels in the hydrogen separator and the oxygen separator need to be ensured to be balanced, the gas and liquid are prevented from being connected with each other to cause eruption danger, and the liquid level balance is realized by adj usting the pressure of the gas in the two separators .
  • an automatic instrument is mainly used for controlling the pressure balance in a hydrogen separator and an oxygen separator, specifically, regulating valves are respectively arranged on outlet pipelines of two separators , field signal detection is carried out through a pressure and differential pressure transmitter, collected
  • SUBSTITUTE SHEET (RULE 26) signals are sent to a regulating instrument (or a PLC system) for analysis , comparison and operation, the differential pressure in the two separators is calculated, and then signals are sent out to control the opening degree of the regulating valves so as to regulate the air pressure, ensure the pressure balance between the two separators and ensure the normal work of equipment .
  • the gas production rate of a single set of electrolysis equipment is improved, on the other hand, the investment of the equipment is reduced, the regulation requirement under the condition of the fluctuation state of renewable energy source electric energy (wind power/photoelectricity) can be met , and the device is a feasible direction of large-scale water electrolysis hydrogen production equipment .
  • the hydrogen production by the parallel connection of a plurality of electrolytic tanks has variable working number and load and wide variation range, and the pres sure balance system in the common hydrogen separator and the oxygen separator can balance the liquid level in the
  • the invention provides a device and a method for producing hydrogen by electrolyzing water with a plurality of electrolytic tanks , wherein the size of a container of an oxygen separator is designed into one-stage separation by combining the different yields of hydrogen and oxygen produced by the hydrogen production by electrolyzing water, the oxygen separator is arranged into two stages , and a gas path and an alkali path of the two- stage separator are connected through a communicating pipe , so that the separation effect of separation equipment is met, and the cost is reduced; the hydrogen side regulating valves and the oxygen side regulating valves are arranged in parallel in two ways with one large and one small , the regulating precision of the regulating valves can be ensured according to the number of running electrolytic cells and the load switching of the electrolytic cells , a flow meter and an automatic regulating valve are respectively arranged at an alkali path inlet of each electrolytic cell , and the alkali liquor flow of each electrolytic cell is regulated according to the working state of each electrolytic
  • a water electrolysis hydrogen production device with a plurality of electrolytic tanks comprises : the electrolytic cell adopts electrodes to electrolyze electrolyte to generate hydrogen and oxygen, and two or more electrolytic cells are arranged in the system in parallel ; the hydrogen separator is divided into a hydrogen primary separator and a hydrogen secondary separator, the hydrogen primary separator is communicated with the electrolytic cell through a hydrogen gas-liquid pipeline , a hydrogen outlet of the hydrogen primary separator is communicated with a hydrogen inlet of the hydrogen secondary separator, and a liquid phase of the hydrogen primary separator is also connected with a liquid phase of the hydrogen secondary separator through a communicating pipe and is used for carrying out gas-liquid separation on the hydrogen generated by the electrolytic cell ; the oxygen separator is communicated with the electrolytic cell through an oxygen-liquid pipeline and is used for carrying out gas-liquid separation on oxygen generated by the electrolytic cell , and the container of the oxygen separator is the same as the container of the primary hydrogen separator in size ; the
  • SUBSTITUTE SHEET (RULE 26) comprises a small oxygen regulating valve, a large oxygen regulating valve , an oxygen automatic ball valve and an oxygen bypass manual ball valve, wherein the small oxygen regulating valve and the large oxygen regulating valve are connected in parallel , the large oxygen regulating valve and the oxygen automatic ball valve are connected in parallel , the oxygen bypass manual ball valve is connected to the two ends of the small oxygen regulating valve , the large oxygen regulating valve and the oxygen automatic ball valve, and the regulating valves are used according to the number of started electrolytic tanks and load switching;
  • the hydrogen side control device comprises a large hydrogen regulating valve , a small hydrogen regulating valve , a large hydrogen regulating valve , a hydrogen automatic ball valve at the front end of the regulating valve and hydrogen bypass manual ball valves connected to two ends of the small hydrogen regulating valve , the large hydrogen regulating valve and the hydrogen automatic ball valve , wherein the outlet of the hydrogen separator is connected to rear-end equipment through the hydrogen side control device ; the outlet of the alkali liquor
  • two or more than two electrolytic cells are arranged in the system in parallel , and an alkali inlet circuit and an air alkali liquid outlet of each electrolytic cell are connected in parallel .
  • the oxygen separator is provided with a remotetransmission oxygen liquid level transmitter, the hydrogen
  • SUBSTITUTE SHEET (RULE 26) secondary separator is provided with a remote-transmission hydrogen liquid level transmitter and a hydrogen differential pressure transmitter, and the oxygen side control device is adj usted according to the liquid level difference between the two sides .
  • the oxygen separator is provided with a remote oxygen pressure transmitter and an oxygen differential pressure transmitter, and the oxygen side control device adj usts according to the pressure value of the oxygen pressure transmitter .
  • the oxygen level transmitter and the hydrogen level transmitter are connected to the oxygen separator and the hydrogen secondary separator through a foot valve or a valve block .
  • an outlet of the oxygen separator is connected to an oxygen side control device, an outlet of the oxygen side control device is connected to an automatic oxygen three-way valve , one outlet of the oxygen three-way valve is connected to the atmosphere , and the other outlet of the oxygen three-way valve is connected to the rear-end equipment .
  • the outlet of the hydrogen secondary separator is connected to a hydrogen side control device , the outlet of the hydrogen side control device is connected to an automatic hydrogen three-way valve, one path of outlet of the hydrogen three-way valve is connected with a hydrogen flame arrester, the hydrogen three-way valve is connected to the atmosphere through the hydrogen flame arrester, and the other path of outlet of the hydrogen three-way valve is connected to rear-end equipment .
  • the alkali liquor of the oxygen separator and the alkali liquor of the hydrogen secondary separator are identical to the alkali liquor of the oxygen separator and the alkali liquor of the hydrogen secondary separator.
  • SUBSTITUTE SHEET (RULE 26) collected to an alkali liquor circulating pump, and an outlet of the alkali liquor circulating pump is connected to each electrolytic tank through an alkali liquor flow control system .
  • each path of the alkali liquor flow control system is provided with an alkali liquor flow meter and an automatic regulating valve .
  • a hydrogen production method of a water electrolysis hydrogen production device adopting a plurality of electrolytic tanks comprises the following steps : the first step is as follows : starting an electrolytic cell to electrolyze the alkali liquor, and generating hydrogen and oxygen in the electrolytic cell ; the second step is that : starting a circulating pump, extracting and collecting alkali liquor in the oxygen separator and the hydrogen secondary separator, and reinj ecting the alkali liquor into the electrolytic cell , wherein the pressure intensity of the oxygen separator and the pressure intensity of the hydrogen secondary separator are reduced, and oxygen and hydrogen generated in the electrolytic cell respectively enter the oxygen separator and the hydrogen secondary separator along the same potential ; the third step : selecting switches of a small hydrogen regulating valve , a large hydrogen regulating valve , a small oxygen regulating valve and a large oxygen regulating valve according to the number of the electrolytic cells to be started and the load, starting only a single electrolytic cell or low-load operation of the electrolytic cells , closing the large hydrogen regulating valve and
  • SUBSTITUTE SHEET normally starting a plurality of electrolytic cells , closing the small hydrogen regulating valve and the small oxygen regulating valve , and adopting the large hydrogen regulating valve and the large oxygen regulating valve ;
  • the fourth step collecting hydrogen and oxygen discharged from the hydrogen three-way valve and the oxygen three-way valve ; in the hydrogen production process , the proper flow is automatically selected according to the working condition of each electrolytic cell , and the opening of the valve is adj usted according to a signal fed back by the flowmeter, so that the flow reaches a set value or an automatically selected value;
  • the hydrogen production method simultaneously uses a plurality of electrolytic cells or only starts one electrolytic cell , the load of the electrolytic cell is between 10 percent and 120 percent, the position fluctuation error is not more than 5cm, and the pressure fluctuation error is not more than 0 . 1 MPa .
  • the invention provides a device and a method for producing hydrogen by water electrolysis of a plurality of electrolytic tanks , which have the following beneficial effects :
  • SUBSTITUTE SHEET (RULE 26) flow velocity of the alkali liquor flowing back into the electrolytic cells can be controlled according to the operation condition of each electrolytic cell ;
  • the hydrogen separator is provided with two hydrogen separators which are connected in series , the oxygen separator is only provided with one separator the volume of which is close to that of the hydrogen first-stage separator, the oxygen side control device comprises a large oxygen regulating valve and a small oxygen regulating valve which are connected in parallel , the hydrogen side control device comprises a large hydrogen regulating valve and a small hydrogen regulating valve which are connected in parallel , the oxygen side control device and the hydrogen side control device can be adj usted by aiming at selecting the regulating valves according to the load conditions of a plurality of electrolytic tanks , the adj ustment accuracy can be ensured, further, the liquid level difference between the oxygen separator and the hydrogen separator can be ensured to be maintained in a reasonable range under various operations of the plurality of electrolytic tanks , the mixing of oxygen and hydrogen caused by the overlarge liquid difference is avoided, meanwhile, the hydrogen production and the yield difference of hydrogen production by using electrolyzed water are combined, and
  • FIG . 1 is a flow chart of a control process for hydrogen
  • fig. 1 is a flow chart of a control process for hydrogen production by water electrolysis according to an embodiment of the present invention.
  • the hydrogen production device by electrolyzing water comprises a plurality of electrolytic tanks 1, an oxygen separator 2, a hydrogen primary separator 3, a hydrogen secondary separator 4, a circulating pump 5, an oxygen side control
  • SUBSTITUTE SHEET (RULE 26) device a hydrogen side control device and an alkali liquor flow control system .
  • the electrolyte in each electrolytic cell 1 is electrolyzed by electrodes to generate hydrogen and oxygen, wherein the electrolyte can be pure water or KOH or NaOH lye, etc .
  • the oxygen separator 2 and the hydrogen first-stage separator 3 are respectively communicated with the electrolytic cell 1 through an oxygen liquid pipeline and a hydrogen gas liquid pipeline, wherein the oxygen separator 2 is used for carrying out gas-liquid separation on oxygen generated by the electrolytic cell 1 , the hydrogen first-stage separator 3 is used for carrying out preliminary gas-liquid separation on hydrogen generated by the electrolytic cell 1 , the separated hydrogen enters the hydrogen second-stage separator 4 for carrying out second-stage gas-liquid separation, and the hydrogen first- stage separator 3 and the hydrogen second-stage separator 4 are connected through a gas path communicating pipe and a liquid path communicating pipe .
  • the vessel volume of the oxygen separator 2 is close to the hydrogen primary separator 3 , for example , the vessel volume of the oxygen separator 2 is the same size as the vessel volume of the hydrogen primary separator 3 .
  • the circulating pump 5 is respectively communicated with a hydrogen side return pipeline at the bottom of the hydrogen secondary separator 4 and an oxygen side return pipeline at the bottom of the oxygen separator 2 , and is used for respectively feeding the liquid in the hydrogen secondary separator 4 and the liquid in the oxygen separator 2 into each electrolytic tank 1 for recycling through an alkaline liquid flow regulating system, and the alkaline liquid flow regulating system comprises an alkaline liquid flowmeter 6 and an automatic regulating valve 7 .
  • the outlet at the top of the oxygen separator 2 is communicated with the back-end equipment or the atmosphere through an oxygen side control device
  • the outlet at the top of the hydrogen secondary separator 4 is connected to the back-end equipment or the atmosphere through a hydrogen side control device
  • the oxygen side control device comprises a large oxygen regulating valve 16 , a small oxygen regulating valve 15 , an oxygen automatic ball valve 13 and an oxygen bypass manual ball valve 14
  • the hydrogen side control device comprises a large hydrogen regulating valve 21 , a small hydrogen regulating valve 20 , a hydrogen automatic ball valve 19 and a hydrogen bypass manual ball valve 18 .
  • the hydrogen side and the oxygen side in the prior art are respectively provided with the regulating valves to be changed into a large regulating valve ( 16 and 21 ) and a small regulating valve ( 15 and 20 ) , the large regulating valve ( 16 ) and the large regulating valve ( 21 ) are closed under the condition of low load when only one electrolytic cell ( 1 ) is started, the small regulating valves
  • valve ( 15 ) and the small regulating valve ( 20 ) are adopted to control the system pressure, the regulating precision can be ensured under the condition that a single electrolytic cell ( 1 ) runs or other low loads , and meanwhile, each electrolytic cell ( 1 ) at the outlet of the alkali pump is provided with a flow regulating and monitoring device , so that each electrolysis can meet the optimal alkali liquor flow under the self-running working condition .
  • the oxygen separator 2 is provided with an oxygen level transmitter 11 , an oxygen pressure transmitter 9 , and an oxygen differential pressure transmitter 8
  • the hydrogen secondary separator 4 is provided with a hydrogen level transmitter 12 and a hydrogen differential pressure transmitter 10 .
  • the large hydrogen regulating valve 21 and the small hydrogen regulating valve 20 are regulated and controlled by hydrogen and oxygen level difference signals , when the liquid level of the oxygen separator 2 is detected to be higher than the liquid level of the hydrogen secondary separator 4 , the opening degrees of the large hydrogen regulating valve 21 and the small hydrogen regulating valve 20 are controlled to be increased, hydrogen in the hydrogen secondary separator 4 can be discharged from the large hydrogen regulating valve 21 and the small hydrogen regulating valve 20 more quickly, the pressure of hydrogen in the hydrogen secondary separator 4 is reduced, and the pressure of oxygen in the oxygen separator 2 is unchanged, so that the liquid in the oxygen separator 2 can be pressed into the hydrogen secondary separator 4 by the oxygen in the oxygen separator 2 , and the liquid level difference between the oxygen separator 2 and the hydrogen secondary
  • SUBSTITUTE SHEET (RULE 26) separator 4 is reduced; when the liquid level of the oxygen separator 2 is detected to be lower than the liquid level of the hydrogen secondary separator 4 , the opening degree of the large hydrogen regulating valve 21 and the small hydrogen regulating valve 20 is controlled to be reduced, hydrogen in the hydrogen secondary separator 4 can be discharged from the large hydrogen regulating valve 21 and the small hydrogen regulating valve 20 more slowly, the pressure of the hydrogen in the hydrogen secondary separator 4 is increased, the pressure of oxygen in the oxygen separator 2 is unchanged, and therefore the liquid in the hydrogen secondary separator 4 is pressed into the oxygen separator 2 by the hydrogen in the hydrogen secondary separator 4 , so that the liquid level difference between the oxygen separator 2 and the hydrogen secondary separator 4 is reduced .
  • the oxygen automatic ball valve 13 and the hydrogen automatic ball valve 19 are closed or opened according to the pressure requirement of the system .
  • the oxygen three-way valve 17 and the hydrogen three-way valve 22 are adj usted to be emptied or connected to a backend device according to other signals such as purity measurement .
  • the large hydrogen regulating valve 21 and the large oxygen regulating valve 16 are selected according to the gas production amount, the pressure amount, and the operation requirement of the full-load start of all the electrolytic cells 1 of the device, and the small oxygen regulating valve 15 and the small hydrogen regulating valve 20 are selected according to the adj ustable range of the large hydrogen regulating valve 21 and the large oxygen regulating valve 16 , and the gas
  • SUBSTITUTE SHEET (RULE 26) production amount, the pressure amount, and the operation requirement of the lowest-load operation condition of the single electrolytic cell 1 .
  • the large hydrogen regulating valve 21 and the large oxygen regulating valve 16 work, the small oxygen regulating valve 15 and the small hydrogen regulating valve 20 are closed, when a single electrolytic tank 1 works or works in other low-load states , the large hydrogen regulating valve 21 and the large oxygen regulating valve 16 are closed, and the small oxygen regulating valve 15 and the small hydrogen regulating valve 20 work; the regulation precision of the equipment pressure and the liquid level difference of the hydrogen and oxygen sides is ensured .
  • the hydrogen production device by water electrolysis further comprises a hydrogen automatic ball valve 19 and an oxygen automatic ball valve 13 , the outlet at the top of the hydrogen secondary separator 4 is connected to the hydrogen side control device through the hydrogen automatic ball valve 19 , and the outlet at the top of the oxygen separator 2 is connected to the oxygen side control device through the oxygen automatic ball valve 13 .
  • the hydrogen automatic ball valve 19 and the oxygen automatic ball valve 13 are used as two pressure retaining valves to ensure the safety of the whole device , and when the safety value of the hydrogenoxygen liquid level difference is large , the opening and closing operation can be carried out by controlling the pressure retaining valves .
  • the oxygen pressure and the hydrogen pressure of the system are respectively set with respective alarm interlocking values to ensure the normal operation of the whole pressure system .
  • the invention provides a hydrogen production method by using water electrolysis , wherein the hydrogen production is carried out by using the water electrolysis hydrogen production device, the gas production regulating range is 10-120% , the liquid level fluctuation error is not more than 5cm, and the pressure fluctuation error is not more than 0 . 1 MPa .
  • Other detailed principles are introduced in the aforementioned hydrogen production device by water electrolysis , and are not described in detail herein .
  • the hydrogen production device by water electrolysis comprises an electrolytic tank 1 , an oxygen separator 2 , a hydrogen primary separator 3 , a hydrogen secondary separator 4 , a circulating pump 5 , an oxygen side control device , a hydrogen side control device and an alkaline liquid flow regulating device , wherein the oxygen separator 2 and the hydrogen primary separator 3 have similar volumes , the oxygen side control device comprises an oxygen regulating valve 15/16 , an oxygen automatic ball valve 13 in front of the oxygen regulating valve, and an
  • the hydrogen side control device comprises a hydrogen regulating valve 20/21 , a hydrogen automatic ball valve 19 in front of the hydrogen regulating valve , and a hydrogen bypass manual ball valve 18 connected to two ends of the hydrogen regulating valve 20 /21 and the hydrogen automatic ball valve 19
  • the oxygen separator 2 is provided with the primary separator
  • the hydrogen is provided with two-stage separation by combining the difference of the yields of hydrogen and oxygen produced by water electrolysis , the cost is saved while the separation effect is satisfied; meanwhile , the alkali inlet of each electrolytic cell 1 is provided with an independent flowmeter 6 and an automatic regulating valve 7 , so that the flow of various loads of small alkali liquor is in the optimal flow range .

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Abstract

The invention discloses a water electrolysis hydrogen production device and method for multiple electrolytic baths, the water electrolysis hydrogen production device comprises the electrolytic baths, an oxygen separator, a hydrogen separator, a circulating pump, an oxygen side control device, a hydrogen side control device and an alkali liquor flow control system, the multiple electrolytic baths are arranged in the system, and the oxygen separator is provided with one separator; the hydrogen separator is provided with two separators which are connected in series and have the same volume as the oxygen separator, the oxygen side control device comprises a large oxygen regulating valve and a small oxygen regulating valve which are connected in parallel, an oxygen automatic ball valve in front of the oxygen regulating valves and oxygen bypass manual balI valves connected to the two ends of the oxygen regulating valves and the two ends of the oxygen automatic ball valve, and the hydrogen side control device comprises a large hydrogen regulating valve and a small hydrogen regulating valve which are connected in parallel. The hydrogen/oxygen side control device is respectively provided with a large adjusting valve and a small adjusting valve, so that the adjusting precision of a single electrolytic cell during low-load operation can be ensured, each flowmeter and each automatic adjusting valve of the alkali liquor control system correspond to one electrolyte cell, and the opening degree adjustment of an alkali path of each electrolytic cell can be automatically controlled.

Description

Water electrolysis hydrogen production device and method of many electrolysis baths
TECHNICAL FIELD
The invention relates to the technical field, of hydrogen production, in particular to a device and a method for producing hydrogen by water electrolysis of multiple electrolytic tanks .
BACKGROUND ART
The hydrogen production method by water electrolysis is that the electrolyte in the water electrolysis tank is electrolyzed by direct current, hydrogen and oxygen containing liquid are respectively generated at the cathode and the anode , and then are sent to a hydrogen separator and an oxygen separator for gravity separation in two ways , the hydrogen and the oxygen are upwards sent to a gas using point, the electrolyte is downwards , and are collected into a circulating pump by backflow, and are sent to the electrolysis tank again for electrolysis , and the hydrogen and the oxygen are generated in a reciprocating way . In the process , the liquid levels in the hydrogen separator and the oxygen separator need to be ensured to be balanced, the gas and liquid are prevented from being connected with each other to cause eruption danger, and the liquid level balance is realized by adj usting the pressure of the gas in the two separators .
At present, an automatic instrument is mainly used for controlling the pressure balance in a hydrogen separator and an oxygen separator, specifically, regulating valves are respectively arranged on outlet pipelines of two separators , field signal detection is carried out through a pressure and differential pressure transmitter, collected
SUBSTITUTE SHEET (RULE 26) signals are sent to a regulating instrument (or a PLC system) for analysis , comparison and operation, the differential pressure in the two separators is calculated, and then signals are sent out to control the opening degree of the regulating valves so as to regulate the air pressure, ensure the pressure balance between the two separators and ensure the normal work of equipment .
In the prior art, because the output of a single electrolytic cell is limited, in order to follow the trend of rapid development of other renewable energy sources , a larger-scale water electrolysis hydrogen production device is needed . The current hydrogen production amount of one electrolytic cell corresponding to one hydrogen production frame is too small , so that the disadvantages of high investment, troublesome later operation and maintenance management and the like exist in large-scale proj ects . In order to improve the yield of the electrolysis equipment , it is necessary to develop a plurality of electrolysis baths corresponding to one hydrogen production frame . On one hand, the gas production rate of a single set of electrolysis equipment is improved, on the other hand, the investment of the equipment is reduced, the regulation requirement under the condition of the fluctuation state of renewable energy source electric energy (wind power/photoelectricity) can be met , and the device is a feasible direction of large-scale water electrolysis hydrogen production equipment .
However, the hydrogen production by the parallel connection of a plurality of electrolytic tanks has variable working number and load and wide variation range, and the pres sure balance system in the common hydrogen separator and the oxygen separator can balance the liquid level in the
SUBSTITUTE SHEET (RULE 26) hydrogen separator and the oxygen separator, but the balance precision is low, and the danger in the hydrogen production process is increased for the whole device . In order to solve the above problems , it is necessary to provide a hydrogen production apparatus and method by water electrolysis with multiple electrolytic cells .
DISCLOSURE OF INVENTION
Aiming at the technical problems , the invention provides a device and a method for producing hydrogen by electrolyzing water with a plurality of electrolytic tanks , wherein the size of a container of an oxygen separator is designed into one-stage separation by combining the different yields of hydrogen and oxygen produced by the hydrogen production by electrolyzing water, the oxygen separator is arranged into two stages , and a gas path and an alkali path of the two- stage separator are connected through a communicating pipe , so that the separation effect of separation equipment is met, and the cost is reduced; the hydrogen side regulating valves and the oxygen side regulating valves are arranged in parallel in two ways with one large and one small , the regulating precision of the regulating valves can be ensured according to the number of running electrolytic cells and the load switching of the electrolytic cells , a flow meter and an automatic regulating valve are respectively arranged at an alkali path inlet of each electrolytic cell , and the alkali liquor flow of each electrolytic cell is regulated according to the working state of each electrolytic cell , so that each electrolytic cell can reach the best running state .
In order to achieve the above purposes , the technical scheme adopted by the invention is as follows :
SUBSTITUTE SHEET (RULE 26) a water electrolysis hydrogen production device with a plurality of electrolytic tanks comprises : the electrolytic cell adopts electrodes to electrolyze electrolyte to generate hydrogen and oxygen, and two or more electrolytic cells are arranged in the system in parallel ; the hydrogen separator is divided into a hydrogen primary separator and a hydrogen secondary separator, the hydrogen primary separator is communicated with the electrolytic cell through a hydrogen gas-liquid pipeline , a hydrogen outlet of the hydrogen primary separator is communicated with a hydrogen inlet of the hydrogen secondary separator, and a liquid phase of the hydrogen primary separator is also connected with a liquid phase of the hydrogen secondary separator through a communicating pipe and is used for carrying out gas-liquid separation on the hydrogen generated by the electrolytic cell ; the oxygen separator is communicated with the electrolytic cell through an oxygen-liquid pipeline and is used for carrying out gas-liquid separation on oxygen generated by the electrolytic cell , and the container of the oxygen separator is the same as the container of the primary hydrogen separator in size ; the circulating pump is respectively communicated with the return pipeline of the hydrogen secondary separator and the oxygen side return pipeline of the oxygen separator, and the circulating pump is used for respectively connecting the liquid in the hydrogen secondary separator and the liquid in the oxygen separator to each electrolytic tank through a flowmeter and a regulating valve ; the oxygen side control device is used for communicating the outlet of the oxygen separator with the atmosphere ,
SUBSTITUTE SHEET (RULE 26) comprises a small oxygen regulating valve, a large oxygen regulating valve , an oxygen automatic ball valve and an oxygen bypass manual ball valve, wherein the small oxygen regulating valve and the large oxygen regulating valve are connected in parallel , the large oxygen regulating valve and the oxygen automatic ball valve are connected in parallel , the oxygen bypass manual ball valve is connected to the two ends of the small oxygen regulating valve , the large oxygen regulating valve and the oxygen automatic ball valve, and the regulating valves are used according to the number of started electrolytic tanks and load switching; the hydrogen side control device comprises a large hydrogen regulating valve , a small hydrogen regulating valve , a large hydrogen regulating valve , a hydrogen automatic ball valve at the front end of the regulating valve and hydrogen bypass manual ball valves connected to two ends of the small hydrogen regulating valve , the large hydrogen regulating valve and the hydrogen automatic ball valve , wherein the outlet of the hydrogen separator is connected to rear-end equipment through the hydrogen side control device ; the outlet of the alkali liquor circulating pump is divided into a plurality of paths , and each path is provided with an alkali liquor flowmeter with remote transmission and an automatic regulating valve which are respectively connected to the alkali inlet of each electrolytic cell .
Preferably, two or more than two electrolytic cells are arranged in the system in parallel , and an alkali inlet circuit and an air alkali liquid outlet of each electrolytic cell are connected in parallel .
Preferably, the oxygen separator is provided with a remotetransmission oxygen liquid level transmitter, the hydrogen
SUBSTITUTE SHEET (RULE 26) secondary separator is provided with a remote-transmission hydrogen liquid level transmitter and a hydrogen differential pressure transmitter, and the oxygen side control device is adj usted according to the liquid level difference between the two sides .
Preferably, the oxygen separator is provided with a remote oxygen pressure transmitter and an oxygen differential pressure transmitter, and the oxygen side control device adj usts according to the pressure value of the oxygen pressure transmitter .
Preferably, the oxygen level transmitter and the hydrogen level transmitter are connected to the oxygen separator and the hydrogen secondary separator through a foot valve or a valve block .
Preferably, an outlet of the oxygen separator is connected to an oxygen side control device, an outlet of the oxygen side control device is connected to an automatic oxygen three-way valve , one outlet of the oxygen three-way valve is connected to the atmosphere , and the other outlet of the oxygen three-way valve is connected to the rear-end equipment .
Preferably, the outlet of the hydrogen secondary separator is connected to a hydrogen side control device , the outlet of the hydrogen side control device is connected to an automatic hydrogen three-way valve, one path of outlet of the hydrogen three-way valve is connected with a hydrogen flame arrester, the hydrogen three-way valve is connected to the atmosphere through the hydrogen flame arrester, and the other path of outlet of the hydrogen three-way valve is connected to rear-end equipment .
Preferably, the alkali liquor of the oxygen separator and the alkali liquor of the hydrogen secondary separator are
SUBSTITUTE SHEET (RULE 26) collected to an alkali liquor circulating pump, and an outlet of the alkali liquor circulating pump is connected to each electrolytic tank through an alkali liquor flow control system .
Preferably, each path of the alkali liquor flow control system is provided with an alkali liquor flow meter and an automatic regulating valve .
A hydrogen production method of a water electrolysis hydrogen production device adopting a plurality of electrolytic tanks comprises the following steps : the first step is as follows : starting an electrolytic cell to electrolyze the alkali liquor, and generating hydrogen and oxygen in the electrolytic cell ; the second step is that : starting a circulating pump, extracting and collecting alkali liquor in the oxygen separator and the hydrogen secondary separator, and reinj ecting the alkali liquor into the electrolytic cell , wherein the pressure intensity of the oxygen separator and the pressure intensity of the hydrogen secondary separator are reduced, and oxygen and hydrogen generated in the electrolytic cell respectively enter the oxygen separator and the hydrogen secondary separator along the same potential ; the third step : selecting switches of a small hydrogen regulating valve , a large hydrogen regulating valve , a small oxygen regulating valve and a large oxygen regulating valve according to the number of the electrolytic cells to be started and the load, starting only a single electrolytic cell or low-load operation of the electrolytic cells , closing the large hydrogen regulating valve and the large oxygen regulating valve , adopting the small hydrogen regulating valve and the small oxygen regulating valve ,
SUBSTITUTE SHEET (RULE 26) normally starting a plurality of electrolytic cells , closing the small hydrogen regulating valve and the small oxygen regulating valve , and adopting the large hydrogen regulating valve and the large oxygen regulating valve ; the fourth step : collecting hydrogen and oxygen discharged from the hydrogen three-way valve and the oxygen three-way valve ; in the hydrogen production process , the proper flow is automatically selected according to the working condition of each electrolytic cell , and the opening of the valve is adj usted according to a signal fed back by the flowmeter, so that the flow reaches a set value or an automatically selected value; the hydrogen production method simultaneously uses a plurality of electrolytic cells or only starts one electrolytic cell , the load of the electrolytic cell is between 10 percent and 120 percent, the position fluctuation error is not more than 5cm, and the pressure fluctuation error is not more than 0 . 1 MPa .
Compared with the prior art, the invention provides a device and a method for producing hydrogen by water electrolysis of a plurality of electrolytic tanks , which have the following beneficial effects :
1 . by arranging a plurality of electrolytic tanks , oxygen separators , hydrogen separators and circulating pumps , the problem of limited output of a single electrolytic tank is solved, on one hand, the gas production of a single set of electrolytic equipment is improved, and on the other hand, the investment of the equipment is reduced; an alkali liquor flow meter and an automatic regulating valve are arranged on a pipeline from the outlet of the alkali liquor circulating pump to each electrolytic cell , so that the
SUBSTITUTE SHEET (RULE 26) flow velocity of the alkali liquor flowing back into the electrolytic cells can be controlled according to the operation condition of each electrolytic cell ;
2 . by arranging the oxygen side control device and the hydrogen side control device, the hydrogen separator is provided with two hydrogen separators which are connected in series , the oxygen separator is only provided with one separator the volume of which is close to that of the hydrogen first-stage separator, the oxygen side control device comprises a large oxygen regulating valve and a small oxygen regulating valve which are connected in parallel , the hydrogen side control device comprises a large hydrogen regulating valve and a small hydrogen regulating valve which are connected in parallel , the oxygen side control device and the hydrogen side control device can be adj usted by aiming at selecting the regulating valves according to the load conditions of a plurality of electrolytic tanks , the adj ustment accuracy can be ensured, further, the liquid level difference between the oxygen separator and the hydrogen separator can be ensured to be maintained in a reasonable range under various operations of the plurality of electrolytic tanks , the mixing of oxygen and hydrogen caused by the overlarge liquid difference is avoided, meanwhile, the hydrogen production and the yield difference of hydrogen production by using electrolyzed water are combined, and the hydrogen is provided with two-stage separation oxygen separators which are only arranged in one stage , the cost is saved while the separation effect is satisfied .
DRAWINGS DESCRIPTION
FIG . 1 is a flow chart of a control process for hydrogen
SUBSTITUTE SHEET (RULE 26) production by water electrolysis according to an embodiment of the present invention;
1. an electrolytic cell; 2. an oxygen separator; 3. a hydrogen first-stage separator; 4. a hydrogen secondary separator; 5. a circulation pump; 6. a flow meter; 7. an automatic regulating valve; 8. an oxygen differential pressure transmitter; 9. an oxygen pressure transmitter; 10. a hydrogen differential pressure transmitter; 11. an oxygen level transmitter; 12. a hydrogen level transmitter; 13. an oxygen automatic ball valve; 14. an oxygen bypass manual ball valve; 15. a small oxygen regulating valve; 16. a big oxygen regulating valve; 17. an oxygen three-way valve; 18. a hydrogen bypass manual ball valve; 19. a hydrogen automatic ball valve; 20. a small hydrogen regulating valve; 21. a large hydrogen regulating valve; 22. a hydrogen three-way valve; 23. a hydrogen flame arrestor .
INVENTION MODE
DETAILED DESCRIPTION
The present application is further described with reference to the accompanying drawings and the detailed description, and it should be noted that, in the present application, the embodiments or technical features described below may be arbitrarily combined to form a new embodiment without conflict .
Referring to fig. 1, fig. 1 is a flow chart of a control process for hydrogen production by water electrolysis according to an embodiment of the present invention. The hydrogen production device by electrolyzing water comprises a plurality of electrolytic tanks 1, an oxygen separator 2, a hydrogen primary separator 3, a hydrogen secondary separator 4, a circulating pump 5, an oxygen side control
SUBSTITUTE SHEET (RULE 26) device, a hydrogen side control device and an alkali liquor flow control system . The electrolyte in each electrolytic cell 1 is electrolyzed by electrodes to generate hydrogen and oxygen, wherein the electrolyte can be pure water or KOH or NaOH lye, etc . The oxygen separator 2 and the hydrogen first-stage separator 3 are respectively communicated with the electrolytic cell 1 through an oxygen liquid pipeline and a hydrogen gas liquid pipeline, wherein the oxygen separator 2 is used for carrying out gas-liquid separation on oxygen generated by the electrolytic cell 1 , the hydrogen first-stage separator 3 is used for carrying out preliminary gas-liquid separation on hydrogen generated by the electrolytic cell 1 , the separated hydrogen enters the hydrogen second-stage separator 4 for carrying out second-stage gas-liquid separation, and the hydrogen first- stage separator 3 and the hydrogen second-stage separator 4 are connected through a gas path communicating pipe and a liquid path communicating pipe . Wherein the vessel volume of the oxygen separator 2 is close to the hydrogen primary separator 3 , for example , the vessel volume of the oxygen separator 2 is the same size as the vessel volume of the hydrogen primary separator 3 . The circulating pump 5 is respectively communicated with a hydrogen side return pipeline at the bottom of the hydrogen secondary separator 4 and an oxygen side return pipeline at the bottom of the oxygen separator 2 , and is used for respectively feeding the liquid in the hydrogen secondary separator 4 and the liquid in the oxygen separator 2 into each electrolytic tank 1 for recycling through an alkaline liquid flow regulating system, and the alkaline liquid flow regulating system comprises an alkaline liquid flowmeter 6 and an automatic regulating valve 7 . Specifically, hydrogen and
SUBSTITUTE SHEET (RULE 26) oxygen generated in the electrolytic cell 1 and the electrolyte are discharged from the electrolytic cell 1 to the corresponding hydrogen primary separator 3 and oxygen separator 2 by the external force of the circulation pump 5 , and are separated by the physical properties of the gas and liquid deadweight . The outlet at the top of the oxygen separator 2 is communicated with the back-end equipment or the atmosphere through an oxygen side control device, the outlet at the top of the hydrogen secondary separator 4 is connected to the back-end equipment or the atmosphere through a hydrogen side control device, the oxygen side control device comprises a large oxygen regulating valve 16 , a small oxygen regulating valve 15 , an oxygen automatic ball valve 13 and an oxygen bypass manual ball valve 14 , and the hydrogen side control device comprises a large hydrogen regulating valve 21 , a small hydrogen regulating valve 20 , a hydrogen automatic ball valve 19 and a hydrogen bypass manual ball valve 18 .
In the invention, when hydrogen is prepared by electrolyzing water to prepare hydrogen, because the oxygen yield is 1 /2 of hydrogen, the hydrogen is separated in two stages , the oxygen is separated in one stage, the volume of the oxygen separator 2 is similar to that of the hydrogen separator 3 , and the cost of the oxygen separator 2 is reduced while the hydrogen separation effect is ensured . Furthermore, the hydrogen side and the oxygen side in the prior art are respectively provided with the regulating valves to be changed into a large regulating valve ( 16 and 21 ) and a small regulating valve ( 15 and 20 ) , the large regulating valve ( 16 ) and the large regulating valve ( 21 ) are closed under the condition of low load when only one electrolytic cell ( 1 ) is started, the small regulating
SUBSTITUTE SHEET (RULE 26) valve ( 15 ) and the small regulating valve ( 20 ) are adopted to control the system pressure, the regulating precision can be ensured under the condition that a single electrolytic cell ( 1 ) runs or other low loads , and meanwhile, each electrolytic cell ( 1 ) at the outlet of the alkali pump is provided with a flow regulating and monitoring device , so that each electrolysis can meet the optimal alkali liquor flow under the self-running working condition .
In this embodiment, the oxygen separator 2 is provided with an oxygen level transmitter 11 , an oxygen pressure transmitter 9 , and an oxygen differential pressure transmitter 8 , and the hydrogen secondary separator 4 is provided with a hydrogen level transmitter 12 and a hydrogen differential pressure transmitter 10 . The large hydrogen regulating valve 21 and the small hydrogen regulating valve 20 are regulated and controlled by hydrogen and oxygen level difference signals , when the liquid level of the oxygen separator 2 is detected to be higher than the liquid level of the hydrogen secondary separator 4 , the opening degrees of the large hydrogen regulating valve 21 and the small hydrogen regulating valve 20 are controlled to be increased, hydrogen in the hydrogen secondary separator 4 can be discharged from the large hydrogen regulating valve 21 and the small hydrogen regulating valve 20 more quickly, the pressure of hydrogen in the hydrogen secondary separator 4 is reduced, and the pressure of oxygen in the oxygen separator 2 is unchanged, so that the liquid in the oxygen separator 2 can be pressed into the hydrogen secondary separator 4 by the oxygen in the oxygen separator 2 , and the liquid level difference between the oxygen separator 2 and the hydrogen secondary
SUBSTITUTE SHEET (RULE 26) separator 4 is reduced; when the liquid level of the oxygen separator 2 is detected to be lower than the liquid level of the hydrogen secondary separator 4 , the opening degree of the large hydrogen regulating valve 21 and the small hydrogen regulating valve 20 is controlled to be reduced, hydrogen in the hydrogen secondary separator 4 can be discharged from the large hydrogen regulating valve 21 and the small hydrogen regulating valve 20 more slowly, the pressure of the hydrogen in the hydrogen secondary separator 4 is increased, the pressure of oxygen in the oxygen separator 2 is unchanged, and therefore the liquid in the hydrogen secondary separator 4 is pressed into the oxygen separator 2 by the hydrogen in the hydrogen secondary separator 4 , so that the liquid level difference between the oxygen separator 2 and the hydrogen secondary separator 4 is reduced .
The oxygen automatic ball valve 13 and the hydrogen automatic ball valve 19 are closed or opened according to the pressure requirement of the system .
The oxygen three-way valve 17 and the hydrogen three-way valve 22 are adj usted to be emptied or connected to a backend device according to other signals such as purity measurement .
In this embodiment, the large hydrogen regulating valve 21 and the large oxygen regulating valve 16 are selected according to the gas production amount, the pressure amount, and the operation requirement of the full-load start of all the electrolytic cells 1 of the device, and the small oxygen regulating valve 15 and the small hydrogen regulating valve 20 are selected according to the adj ustable range of the large hydrogen regulating valve 21 and the large oxygen regulating valve 16 , and the gas
SUBSTITUTE SHEET (RULE 26) production amount, the pressure amount, and the operation requirement of the lowest-load operation condition of the single electrolytic cell 1 . When a plurality of normal electrolytic tanks 1 run simultaneously, the large hydrogen regulating valve 21 and the large oxygen regulating valve 16 work, the small oxygen regulating valve 15 and the small hydrogen regulating valve 20 are closed, when a single electrolytic tank 1 works or works in other low-load states , the large hydrogen regulating valve 21 and the large oxygen regulating valve 16 are closed, and the small oxygen regulating valve 15 and the small hydrogen regulating valve 20 work; the regulation precision of the equipment pressure and the liquid level difference of the hydrogen and oxygen sides is ensured .
In the embodiment of the invention, the hydrogen production device by water electrolysis further comprises a hydrogen automatic ball valve 19 and an oxygen automatic ball valve 13 , the outlet at the top of the hydrogen secondary separator 4 is connected to the hydrogen side control device through the hydrogen automatic ball valve 19 , and the outlet at the top of the oxygen separator 2 is connected to the oxygen side control device through the oxygen automatic ball valve 13 . The hydrogen automatic ball valve 19 and the oxygen automatic ball valve 13 are used as two pressure retaining valves to ensure the safety of the whole device , and when the safety value of the hydrogenoxygen liquid level difference is large , the opening and closing operation can be carried out by controlling the pressure retaining valves . And the oxygen pressure and the hydrogen pressure of the system are respectively set with respective alarm interlocking values to ensure the normal operation of the whole pressure system .
SUBSTITUTE SHEET (RULE 26) When the electrolytic cell works , a flow value is automatically or manually set according to the current load, the actual flow is monitored through the flowmeter 6 , if the flow value is higher than a set value, the automatic regulating valve 7 is controlled to reduce the opening, and if the flow value is lower than the set value , the automatic regulating valve 7 is controlled to increase the opening . Along with the continuous change of the load of the electrolytic cell , the set value also changes continuously, and the dynamic adj ustment of the automatic adj usting valve 7 is realized through the monitoring of the flowmeter 6 so as to adapt to the requirement of hydrogen production by the fluctuation power supply .
The invention provides a hydrogen production method by using water electrolysis , wherein the hydrogen production is carried out by using the water electrolysis hydrogen production device, the gas production regulating range is 10-120% , the liquid level fluctuation error is not more than 5cm, and the pressure fluctuation error is not more than 0 . 1 MPa . Other detailed principles are introduced in the aforementioned hydrogen production device by water electrolysis , and are not described in detail herein .
In summary, the hydrogen production device by water electrolysis comprises an electrolytic tank 1 , an oxygen separator 2 , a hydrogen primary separator 3 , a hydrogen secondary separator 4 , a circulating pump 5 , an oxygen side control device , a hydrogen side control device and an alkaline liquid flow regulating device , wherein the oxygen separator 2 and the hydrogen primary separator 3 have similar volumes , the oxygen side control device comprises an oxygen regulating valve 15/16 , an oxygen automatic ball valve 13 in front of the oxygen regulating valve, and an
SUBSTITUTE SHEET (RULE 26) oxygen bypass manual ball valve 14 connected to two ends of the oxygen regulating valve 15/ 16 and the oxygen automatic ball valve 13 , the hydrogen side control device comprises a hydrogen regulating valve 20/21 , a hydrogen automatic ball valve 19 in front of the hydrogen regulating valve , and a hydrogen bypass manual ball valve 18 connected to two ends of the hydrogen regulating valve 20 /21 and the hydrogen automatic ball valve 19 , the oxygen separator 2 is provided with the primary separator, the hydrogen is provided with two-stage separation by combining the difference of the yields of hydrogen and oxygen produced by water electrolysis , the cost is saved while the separation effect is satisfied; meanwhile , the alkali inlet of each electrolytic cell 1 is provided with an independent flowmeter 6 and an automatic regulating valve 7 , so that the flow of various loads of small alkali liquor is in the optimal flow range .
The foregoing description and drawings are only for purposes of illustrating the preferred embodiments of the present application and are not intended to limit the present application, which is , therefore , to the contrary, the intention is to cover all modifications , equivalents , and alternatives falling within the spirit and scope of the present application .
SUBSTITUTE SHEET (RULE 26)

Claims

1. A water electrolysis hydrogen production device with a plurality of electrolytic tanks is characterized by comprising: the electrolytic cell (1) adopts electrodes to electrolyze electrolyte to generate hydrogen and oxygen, and two or more than two electrolytic cells (1) are arranged in the system in parallel; the hydrogen separator is divided into a hydrogen primary separator (3) and a hydrogen secondary separator (4) , the hydrogen primary separator (3) is communicated with the electrolytic cell (1) through a hydrogen gas-liquid pipeline, a hydrogen outlet of the hydrogen primary separator (3) is communicated with a hydrogen inlet of the hydrogen secondary separator (4) , and liquid phases of the hydrogen primary separator (3) and the hydrogen secondary separator (4) are also connected through a communicating pipe and used for carrying out gas-liquid separation on the hydrogen generated by the electrolytic cell (1) ; the oxygen separator (2) is communicated with the electrolytic cell (1) through an oxygen liquid pipeline and is used for carrying out gas-liquid separation on oxygen generated by the electrolytic cell (1) , and the container of the oxygen separator (2) is the same as the size of the primary hydrogen separator (3) ; the circulating pump (5) is respectively communicated with a return pipeline of the hydrogen secondary separator (4) and an oxygen side return pipeline of the oxygen separator (2) , and the circulating pump (5) is used for respectively connecting liquid in the hydrogen secondary separator (4) and the oxygen separator (2) to each electrolytic tank (1) through a flowmeter (6) and a regulating valve; the
SUBSTITUTE SHEET (RULE 26) oxygen side control device is used for communicating the outlet of the oxygen separator (2) with the atmosphere through the oxygen side control device, the oxygen side control device comprises a small oxygen regulating valve (15) and a large oxygen regulating valve (16) which are connected in parallel, an oxygen automatic ball valve (13) at the front end of the regulating valves and oxygen bypass manual ball valves (14) connected to the two ends of the small oxygen regulating valve (15) , the large oxygen regulating valve (16) and the oxygen automatic ball valve (13) , and the regulating valves are used according to the number of the started electrolytic tanks (1) and load switching; the hydrogen side control device is connected with rear-end equipment through an outlet of the hydrogen separator, the hydrogen side control device comprises a small hydrogen regulating valve (20) and a large hydrogen regulating valve (21) which are connected in parallel, a hydrogen automatic ball valve (19) at the front end of the regulating valves and hydrogen bypass manual ball valves (18) connected to two ends of the small hydrogen regulating valve (20) , the large hydrogen regulating valve (21) and the hydrogen automatic ball valve (19) , and the regulating valves are switched and used according to the number and the load of the started electrolytic tanks (1) ; the alkali liquor flow control system is characterized in that an outlet of an alkali liquor circulating pump (5) is divided into a plurality of paths, and each path is provided with an alkali liquor flow meter (6) with remote transmission and an automatic regulating valve (7) which are respectively connected to an alkali inlet of each electrolytic cell (1) .
SUBSTITUTE SHEET (RULE 26)
2. The hydrogen production plant by water electrolysis of a plurality of electrolysis baths according to claim 1, characterized in that two or more than two electrolysis baths (1) are arranged in parallel in the system, and the alkali inlet circuit and the gas-alkali solution outlet of each electrolysis bath (1) are connected in parallel.
3. The apparatus for the production of hydrogen by the electrolysis of water with a plurality of electrolytic cells as claimed in claim 1, wherein the oxygen separator (2) is provided with a remote oxygen level transmitter (11) , the hydrogen secondary separator (4) is provided with a remote hydrogen level transmitter (12) and a hydrogen differential pressure transmitter (10) , and the oxygen side control apparatus is adjusted according to the difference between the liquid levels at both sides.
4. The hydrogen production apparatus by water electrolysis of a plurality of electrolytic cells according to claim 1, characterized in that the oxygen separator (2) is provided with a remote oxygen pressure transmitter (9) and an oxygen differential pressure transmitter (8) , and the oxygen side control device adjusts according to the pressure value of the oxygen pressure transmitter (9) .
5. The apparatus for the production of hydrogen by the electrolysis of water with multiple electrolytic cells according to claim 3, wherein the oxygen level transmitter (11) and the hydrogen level transmitter (12) are connected to the oxygen separator (2) and the hydrogen secondary separator (4) through a foot valve or a valve bank.
SUBSTITUTE SHEET (RULE 26) 21
6. The hydrogen production device by water electrolysis of a plurality of electrolysis baths according to claim 1, characterized in that the outlet of the oxygen separator (2) is connected to an oxygen side control device, the outlet of the oxygen side control device is connected to an automatic oxygen three-way valve (17) , one outlet of the oxygen three-way valve (17) is connected to the atmosphere, and the other outlet of the oxygen three-way valve (17) is connected to a rear end device .
7. The hydrogen production device by water electrolysis of multiple electrolytic cells as claimed in claim 1, wherein the outlet of the hydrogen secondary separator (4) is connected to a hydrogen side control device, the outlet of the hydrogen side control device is connected to an automatic hydrogen three-way valve (22) , one outlet of the hydrogen three-way valve (22) is connected with a hydrogen flame arrester (23) , the hydrogen three- way valve (22) is connected to the atmosphere through the hydrogen flame arrester (23) , and the other outlet of the hydrogen three-way valve (22) is connected to a rear-end device.
8. The hydrogen production plant by water electrolysis of a plurality of electrolytic cells as claimed in claim 1, characterized in that the alkali liquor of the oxygen separator (2) and the hydrogen secondary separator (4) is collected to an alkali liquor circulating pump (5) , and the outlet of the alkali liquor circulating pump (5) is connected to each electrolytic cell (1) through an alkali liquor flow control system.
9. The hydrogen production plant by water electrolysis of a plurality of electrolytic cells as claimed in claim
SUBSTITUTE SHEET (RULE 26) 22
1, characterized in that the alkali liquor flow control system is provided with an alkali liquor flow meter (6) and an automatic re ulatin valve (7) in each path.
10. A method for producing hydrogen by a water electrolysis hydrogen production apparatus with a plurality of electrolytic cells according to any one of claims 1 to 9, characterized by comprising the steps of: the first step is as follows: starting the electrolytic cell (1) to electrolyze the alkali liquor, and generating hydrogen and oxygen in the electrolytic cell (1) ; the second step is that: starting a circulating pump (5) , extracting and collecting alkali liquor in the oxygen separator (2) and the hydrogen secondary separator (4) , and re-injecting the alkali liquor into the electrolytic tank (1) , wherein the pressure of the oxygen separator (2) and the pressure of the hydrogen secondary separator (4) are reduced, and oxygen and hydrogen generated in the electrolytic tank (1) enter the oxygen separator (2) and the hydrogen secondary separator (4) respectively; the third step: selecting switches of a small hydrogen regulating valve (20) , a large hydrogen regulating valve (21) , a small oxygen regulating valve (15) and a large oxygen regulating valve (16) according to the number of the activated electrolytic cells (1) and the load, only activating a single electrolytic cell (1) or the electrolytic cells (1) to operate at low load, closing the large hydrogen regulating valve (21) and the large oxygen regulating valve (16) , adopting the small hydrogen regulating valve (20) and the small oxygen regulating valve (15) , normally activating a plurality of electrolytic cells (1) , closing the small hydrogen regulating valve (20)
SUBSTITUTE SHEET (RULE 26) 23 and the small oxygen regulating valve (15) , and adopting the large hydrogen regulating valve (21) and the large oxygen regulating valve (16) ; the fourth step: collecting hydrogen and oxygen discharged from a hydrogen three-way valve (22) and an oxygen three way valve (17) ; in the hydrogen production process, the proper flow is automatically selected according to the working condition of each electrolytic cell (1) , and the opening of the valve is adjusted according to a signal fed back by the flowmeter (6) so that the flow reaches a set value or an automatically selected value; the hydrogen production method simultaneously uses a plurality of electrolytic tanks (1) or only starts one electrolytic tank (1) , the load of the electrolytic tank (1) is between 10 percent and 120 percent, the position fluctuation error is not more than 5cm, and the pressure fluctuation error is not more than 0.1 MPa.
SUBSTITUTE SHEET (RULE 26)
PCT/EP2022/086143 2021-12-15 2022-12-15 Water electrolysis hydrogen production device and method for multiple electrolytic cells WO2023111174A2 (en)

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