CN115537836A - Low-pressure alkaline water electrolysis hydrogen production system and method - Google Patents

Low-pressure alkaline water electrolysis hydrogen production system and method Download PDF

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CN115537836A
CN115537836A CN202211136056.0A CN202211136056A CN115537836A CN 115537836 A CN115537836 A CN 115537836A CN 202211136056 A CN202211136056 A CN 202211136056A CN 115537836 A CN115537836 A CN 115537836A
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hydrogen
pipeline
purification
gas
valve
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赵宏
赵海超
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Qingdao Chuangqi Xinde New Energy Technology Co ltd
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Qingdao Chuangqi Xinde New Energy Technology Co ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption
    • C—CHEMISTRY; METALLURGY
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    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/50—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification
    • C01B3/56—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification by contacting with solids; Regeneration of used solids
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • 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
    • C25B9/60—Constructional parts of cells
    • C25B9/67—Heating or cooling means
    • 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

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Abstract

The invention discloses a low-pressure alkaline water electrolysis hydrogen production system and a method, wherein the system comprises an electrolysis reaction tank group, a hydrogen side gas-liquid separation tank, an oxygen side gas-liquid separation tank, a hydrogen side washing cooling tower, an oxygen side washing cooling tower and a hydrogen purification unit; the hydrogen purification unit comprises a hydrogen dryer, a regenerated hydrogen cooler and a regenerated hydrogen water separator. The system and the method for producing hydrogen by low-pressure alkaline water electrolysis have the advantages of flexible design, simple process flow, high hydrogen production efficiency and high hydrogen purity. The invention completes the working processes of all-gas drying, regeneration and regenerated hydrogen drying of the adsorption drying tower through the cyclic adsorption-desorption of the adsorbents in the hydrogen adsorption drying towers, and realizes zero loss, continuous and efficient drying and purification of crude hydrogen. The invention can remove the adsorption water of the three hydrogen adsorption drying towers through a single regenerated hydrogen cooler and a single regenerated hydrogen water separator, and the regenerated hydrogen is deeply purified, and has flexible design, simplified process and simple operation.

Description

Low-pressure alkaline water electrolysis hydrogen production system and method
Technical Field
The invention belongs to the technical field of hydrogen production by water electrolysis, and particularly relates to a low-pressure alkaline water electrolysis hydrogen production system and method.
Background
The product of hydrogen combustion is water, is the cleanest energy in the world, has rich resources and sustainable development, and is regarded as the clean energy with the most development potential in the 21 st century. The utilization of hydrogen energy needs to start with hydrogen production, which is rarely present in elemental form in nature and needs to be produced by industrial processes. The sources of hydrogen are divided into the ways of industrial by-product hydrogen production, fossil fuel hydrogen production, water electrolysis hydrogen production and the like, and the difference lies in the regeneration of raw materials and CO 2 And the cost of emission and hydrogen production. At present, more than 95% of the world's hydrogen production is derived from fossil fuel reforming, and the production process necessarily emits CO 2 (ii) a About 4% to 5% of the hydrogen is derived from electrolyzed water and no CO is produced during the production process 2 And (5) discharging. The development of the hydrogen energy industry is designed to zero or low carbon emission, so that green hydrogen (hydrogen produced by electrolyzing water and renewable energy) is the development direction of the future energy industry.
The hydrogen production by electrolyzing water is green and environment-friendly, flexible in production, high in purity and very wide in market application prospect. The water electrolysis hydrogen production technology mainly comprises three technologies of alkaline water electrolysis (ALK), proton exchange membrane water electrolysis (PEM) and solid oxide water electrolysis (SOE), and the most mature technical route at present is the water electrolysis hydrogen production technology.
The hydrogen production method by electrolyzing water is that direct current is introduced into an electrolytic bath filled with electrolyte, water molecules are subjected to electrochemical reaction on an electrode and decomposed into hydrogen and oxygen, and then the hydrogen and the oxygen are subjected to gas-liquid separation, purification and drying to obtain the product hydrogen. In the process, the electrolyte needs to be continuously consumed and supplemented, the prepared hydrogen needs to pass through a gas-alkali liquor separation process and a gas-water separation process, and the existing process method mostly has the problems of complex flow, low hydrogen preparation efficiency, easy loss and waste of the electrolyte and the hydrogen in the hydrogen preparation process and the like.
Disclosure of Invention
Based on the technical problems, the invention provides a low-pressure alkaline water electrolysis hydrogen production system and a low-pressure alkaline water electrolysis hydrogen production method.
The technical solution adopted by the invention is as follows:
a low-pressure alkaline water electrolysis hydrogen production system comprises an electrolysis reaction tank group, a hydrogen side gas-liquid separation tank, an oxygen side gas-liquid separation tank, a hydrogen side washing cooling tower, an oxygen side washing cooling tower and a hydrogen purification unit;
a hydrogen outlet of the electrolytic reaction tank group is connected with a gas inlet of a hydrogen side gas-liquid separation tank through a first pipeline, a gas outlet of the hydrogen side gas-liquid separation tank is connected with a hydrogen side washing cooling tower through a second pipeline, and the hydrogen side washing cooling tower is connected with a hydrogen discharge pipeline;
an oxygen outlet of the electrolytic reaction tank group is connected with a gas inlet of an oxygen side gas-liquid separation tank through a third pipeline, a gas outlet of the oxygen side gas-liquid separation tank is connected with an oxygen side washing and cooling tower through a fourth pipeline, and the oxygen side washing and cooling tower is connected with an oxygen discharge pipeline;
the hydrogen discharge pipeline is connected with a to-be-compressed hydrogen buffer tank, the to-be-compressed hydrogen buffer tank is connected with the compressed hydrogen buffer tank through a compression system, the compressed hydrogen buffer tank is connected with the inlet end of a hydrogen deaerating tower, the outlet end of the hydrogen deaerating tower is connected with a deaerating hydrogen cooler, the deaerating hydrogen cooler is connected with a capturing and eliminating device, and the capturing and eliminating device is connected with a hydrogen purification unit;
the hydrogen purification unit comprises a hydrogen dryer, a regenerated hydrogen cooler and a regenerated hydrogen water separator, wherein the hydrogen dryer comprises at least two hydrogen adsorption drying towers, namely a hydrogen adsorption drying tower A and a hydrogen adsorption drying tower B, a first port of the hydrogen adsorption drying tower A is connected with the eliminator through a first purification pipeline, a valve A for air to be dried to enter is arranged on the first purification pipeline, a second port of the hydrogen adsorption drying tower A is connected with a qualified hydrogen discharge pipeline through a second purification pipeline, and a valve A for dried air to exit is arranged on the second purification pipeline;
the second purification pipeline is also connected with a second port of the hydrogen adsorption drying tower B through a third purification pipeline, and a regeneration gas A valve and a regeneration gas B valve are arranged on the third purification pipeline; a first port of the hydrogen adsorption drying tower B is connected with one port of a regenerated hydrogen cooler through a fourth purification pipeline, a regenerated gas exhaust valve B is arranged on the fourth purification pipeline, and the other port of the regenerated hydrogen cooler is connected with a regenerated hydrogen water separator through a fifth purification pipeline;
the first purification pipeline is connected with a first port of a hydrogen adsorption drying B tower through a sixth purification pipeline, a valve B for the gas to be dried is arranged on the sixth purification pipeline, the hydrogen adsorption drying B tower is connected with a qualified hydrogen discharge pipeline through a seventh purification pipeline, and a valve B for the dried gas is arranged on the seventh purification pipeline;
the first purification pipeline is also connected with a regeneration hydrogen cooler through an eighth purification pipeline, and a regeneration gas exhaust A valve is arranged on the eighth purification pipeline.
Preferably, the system further comprises an alkali washing water circulation tank, an inlet of the alkali washing water circulation tank is connected with a condensed water conveying pipeline, an outlet of the alkali washing water circulation tank is connected with an inlet of an alkali cooler through a fifth pipeline, a first alkali liquid water replenishing pump is arranged on the fifth pipeline, an outlet of the alkali cooler is connected with a liquid inlet of the hydrogen side washing cooling tower through a sixth pipeline, and an outlet of the alkali cooler is connected with a liquid inlet of the oxygen side washing cooling tower through a seventh pipeline; and the liquid outlet of the hydrogen side washing and cooling tower and the liquid outlet of the oxygen side washing and cooling tower are connected with an alkali washing water circulation tank through an eighth pipeline.
Preferably, a liquid outlet of the hydrogen-side gas-liquid separation tank is connected with an alkali liquor circulating pump through a ninth pipeline, and a first control valve is arranged on the ninth pipeline; a liquid outlet of the oxygen side gas-liquid separation tank is connected with a ninth pipeline or an alkali liquor circulating pump through a tenth pipeline, and a second control valve is arranged on the tenth pipeline;
the alkali liquor circulating pump is connected with the alkali liquor cooler through an eleventh pipeline, and the alkali liquor cooler is connected with an alkali liquor inlet of the electrolytic reaction tank group through a twelfth pipeline.
Preferably, the alkali washing water circulation tank is connected with the hydrogen side gas-liquid separation tank through a thirteenth pipeline, and a second alkali liquor water replenishing pump is arranged on the thirteenth pipeline.
Preferably, the hydrogen dryer still includes hydrogen adsorption drying C tower, the first port of regeneration hydrogen water separator through ninth purification pipeline connection hydrogen adsorption drying C tower is provided with the dry valve of advancing of regeneration gas on ninth purification pipeline, hydrogen adsorption drying C tower passes through the qualified hydrogen exhaust pipe of tenth purification pipeline connection, sets up the dry valve of going out of gas on tenth purification pipeline.
Preferably, the first port of the hydrogen adsorption drying C tower is connected with a main hydrogen conveying pipeline to be dried through an eleventh purification pipeline, and an air inlet C valve to be dried is arranged on the eleventh purification pipeline;
the second port of the hydrogen adsorption drying C tower is communicated with a third purification pipeline through a twelfth purification pipeline, and a regeneration gas C valve is arranged on the twelfth purification pipeline;
the eleventh purification pipeline is also communicated with the eighth purification pipeline through a thirteenth purification pipeline, and a regeneration gas exhaust C valve is arranged on the thirteenth purification pipeline;
the regeneration hydrogen gas-water separator is connected with the first purification pipeline through a fourteenth purification pipeline, and a regeneration gas drying inlet valve A is arranged on the fourteenth purification pipeline; the fourteenth purification pipeline is communicated with the sixth purification pipeline through a fifteenth purification pipeline, and a regeneration gas drying inlet B valve is arranged on the fifteenth purification pipeline.
Preferably, the bottom of the regeneration hydrogen-water separator is connected with a drainage pipeline, a drainage valve is arranged on the drainage pipeline, and the regeneration hydrogen-water separator is also connected with a hydrogen buffer tank to be compressed through a sixteenth purification pipeline; the regeneration hydrogen cooler is connected with a cooling water inlet pipe and a cooling water outlet pipe.
Preferably, the hydrogen adsorption drying tower A, the hydrogen adsorption drying tower B and the hydrogen adsorption drying tower C are internally provided with an adsorbent and a heating device.
A hydrogen production method by low-pressure alkaline water electrolysis adopts the system, and comprises the following steps:
(1) The electrolytic reaction tank group generates water electrolysis reaction to generate hydrogen and oxygen, then the hydrogen and oxygen enter a hydrogen side gas-liquid separation tank and an oxygen side gas-liquid separation tank respectively to separate gas and alkali liquor, and the separated alkali liquor is pumped to the electrolytic reaction tank group through a ninth pipeline and an alkali liquor circulating pump to supplement the consumed electrolyte;
(2) The hydrogen and the oxygen after the preliminary gas-liquid separation are respectively conveyed to a hydrogen side washing cooling tower and an oxygen side washing cooling tower for further purification to remove alkali liquor mixed in the gas, and an alkali washing water circulation tank provides required washing water and electrolysis water for the hydrogen side washing cooling tower, the oxygen side washing cooling tower and an electrolysis reaction tank group;
(3) The hydrogen purified by the alkali liquor continuously enters a compression system, is compressed, then enters a hydrogen deoxygenation tower, is subjected to impurity-removing hydrogen, is treated by a deoxygenation hydrogen cooler and a capturing and eliminating device, and finally enters a hydrogen purification unit;
(4) The working process of the hydrogen purification unit comprises three working periods, and the adsorption drying tower A, the adsorption drying tower B and the adsorption drying tower C sequentially complete three working states of full gas drying, regeneration and regenerated hydrogen drying, so that the cyclic regeneration of the hydrogen adsorption drying tower is realized, and the hydrogen is continuously and efficiently purified;
in the first duty cycle, purifying hydrogen comprises the steps of: the hydrogen to be dried after being treated by the eliminator enters a hydrogen adsorption drying tower A through a first purification pipeline and a valve A of the air to be dried, moisture in the hydrogen is adsorbed by a molecular sieve, and the whole hydrogen is dried and purified, then, 90% of the hydrogen flows out of qualified hydrogen through a second purification pipeline and a valve A of the air to be dried, and is discharged through a qualified hydrogen discharge pipeline and further collected and utilized;
in addition, 10% of hydrogen enters a hydrogen adsorption drying tower B through a third purification pipeline, a regeneration gas A valve and a regeneration gas B valve, at the moment, a heating device in the hydrogen adsorption drying tower B is heated to work, the moisture adsorbed by the molecular sieve adsorbent in the last period is desorbed, the regeneration of the adsorbent is completed, and the heating device stops working; the effluent hydrogen and water vapor continuously pass through a sixth purification pipeline and a regenerated gas exhaust valve B valve and enter a regenerated hydrogen cooler, the water vapor is condensed into liquid water, and then the liquid water enters a regenerated hydrogen water separator through a fifth purification pipeline to capture water;
finally, 10% of the regenerated hydrogen enters a hydrogen adsorption drying C tower through a ninth purification pipeline, a regenerated gas drying inlet C valve and an eleventh purification pipeline, 10% of the hydrogen is completely dried and purified, flows out of the tenth purification pipeline and a dried gas outlet C valve, enters a qualified hydrogen discharge pipeline, is mixed with 90% of the dried hydrogen, and qualified product hydrogen is collected;
in the second working cycle, purifying hydrogen comprises the following steps: the hydrogen to be dried after being treated by the catcher enters a hydrogen adsorption drying tower B through a sixth purifying pipeline and a valve B for air to be dried, and moisture in the hydrogen is adsorbed to complete the drying and purification of all the hydrogen; then, 90% of hydrogen flows out of qualified hydrogen through a seventh purifying pipeline and a drying gas outlet valve B, and is further collected and utilized;
in addition, 10% of hydrogen enters a hydrogen adsorption drying C tower through a regeneration gas B valve, a twelfth purification pipeline and a regeneration gas C valve, at the moment, a heating device is heated to work, and the moisture adsorbed by the molecular sieve adsorbent in the last period is desorbed to complete the regeneration of the adsorbent; the heating device stops working, the flowing hydrogen and the flowing steam continuously pass through an eleventh purification pipeline, a regenerated gas exhaust valve C and a thirteenth purification pipeline, enter a regenerated hydrogen cooler, condense the steam into liquid water, and then enter a regenerated hydrogen water separator through a fifth purification pipeline to capture moisture;
finally, 10% of the regenerated hydrogen enters a hydrogen adsorption drying tower A through a fourteenth purification pipeline and a regenerated gas drying inlet valve A, 10% of the hydrogen is thoroughly dried and purified, flows out through a second purification pipeline and a dried gas outlet valve A, is mixed with 90% of the dried hydrogen, and qualified product hydrogen is collected;
in the third working cycle, the purification of hydrogen comprises the following steps: the hydrogen to be dried after being treated by the capturing and eliminating device enters a hydrogen adsorption and drying C tower through a first purifying pipeline, an eleventh purifying pipeline and a gas to be dried, and moisture in the hydrogen is adsorbed to complete the drying and purification of all the hydrogen; then, qualified hydrogen flows out from 90% of the hydrogen through a tenth purification pipeline and a dry gas outlet C valve and is further collected and utilized;
in addition, 10% of hydrogen enters a hydrogen adsorption drying tower A through a twelfth purification pipeline, a regeneration gas C valve and a regeneration gas A valve, at the moment, a heating device is heated to work, and the moisture adsorbed by the molecular sieve adsorbent in the last period is desorbed to complete the regeneration of the adsorbent; the heating device stops working, the flowing hydrogen and the flowing steam continuously pass through an eighth purification pipeline and a regenerated gas exhaust A valve, enter a regenerated hydrogen cooler, condense the steam into liquid water, and then enter a regenerated hydrogen water separator through a fifth purification pipeline to capture moisture;
and finally, 10% of the regenerated hydrogen enters a B valve through a fifteenth purification pipeline and the regenerated gas drying, enters a hydrogen adsorption drying B tower, is completely dried and purified for 10%, flows out through a seventh purification pipeline and a dried gas outlet B valve, is mixed with 90% of the dried hydrogen, and is collected into qualified product hydrogen.
Preferably, the hydrogen gas after the moisture is collected in the regenerated hydrogen gas-water separator is transferred to the compressed hydrogen buffer tank through a sixteenth purification pipeline, and is mixed with the electrolyzed water crude hydrogen to further complete the purification process.
The beneficial technical effects of the invention are as follows:
1. the invention is provided with the alkali washing water circulating tank, provides the required washing water and the electrolysis water for the washing cooling tower and the electrolysis reaction tank group, and collects the washing water discharged by the washing cooling tower, thereby realizing the full utilization of the circulation of the alkali liquor and reducing the waste.
2. The hydrogen purification unit can safely and efficiently purify the crude hydrogen generated by water electrolysis, and promotes the industrial application of hydrogen energy; the hydrogen purification unit is reasonably matched with the deoxygenation hydrogen cooler, the capturing eliminator and the like, so that impurities in the hydrogen can be removed as much as possible, the purification effect of the hydrogen is ensured, and meanwhile, the hydrogen loss is avoided as much as possible.
3. The invention completes the working processes of all-gas drying, regeneration and regenerated hydrogen drying of the adsorption drying tower through the cyclic adsorption-desorption of the adsorbents in the hydrogen adsorption drying towers, and realizes zero loss, continuous and efficient drying and purification of crude hydrogen. The invention can remove the adsorption water of the three hydrogen adsorption drying towers through a single regenerated hydrogen cooler and a single regenerated hydrogen water separator, and the regenerated hydrogen is deeply purified, and has flexible design, simplified process and simple operation.
4. The system and the method for producing hydrogen by low-pressure alkaline water electrolysis have the advantages of flexible design, simple process flow, high hydrogen production efficiency and high hydrogen purity.
Drawings
The invention will be further described with reference to the following detailed description and drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the structure of a hydrogen purification unit part according to the present invention.
In the figure: 1-an electrolytic reaction tank group, 2-a hydrogen side gas-liquid separation tank, 3-an oxygen side gas-liquid separation tank, 4-a hydrogen side washing cooling tower, 5-an oxygen side washing cooling tower, 6-a caustic wash water circulation tank, 7-a first pipeline, 8-a second pipeline, 9-a hydrogen gas discharge pipeline, 10-a third pipeline, 11-a fourth pipeline, 12-an oxygen gas discharge pipeline, 13-a condensed water delivery pipeline, 14-a fifth pipeline, 15-an alkaline liquid cooler, 16-a first alkaline liquid make-up pump, 17-a sixth pipeline, 18-a seventh pipeline, 19-an eighth pipeline, 20-a ninth pipeline, 21-an alkaline liquid circulation pump, 22-a tenth pipeline, 23-a second control valve, 24-an eleventh pipeline, 25-an alkaline liquid cooler, 26-a twelfth pipeline, 27-a thirteenth pipeline, 28-a second alkaline liquid make-up pump, 29-a hydrogen gas tank to be compressed, 30-a compression system, 31-a compressed hydrogen buffer tank, 32-a hydrogen gas cooler, 33-a hydrogen gas trap, 35-a deoxygenation control valve;
101-regenerated hydrogen cooler, 102-regenerated hydrogen water separator, 103-hydrogen adsorption drying A tower, 104-hydrogen adsorption drying B tower, 105-hydrogen adsorption drying C tower, 106-to-be-dried gas inlet A valve, 107-regenerated gas exhaust A valve, 108-regenerated gas drying inlet A valve, 109-dried gas outlet A valve, 1010-regenerated gas A valve, 1011-to-be-dried gas inlet B valve, 1012-regenerated gas exhaust B valve, 1013-regenerated gas drying inlet B valve, 1014-dried gas outlet B valve, 1015-regenerated gas B valve, 1016-to-be-dried gas inlet C valve, 1017-regenerated gas exhaust C valve, 1018-regenerated gas drying inlet C valve, 1019-dried gas outlet C valve, 1020-regenerated gas C valve 1021-first purification pipeline, 1022-second purification pipeline, 1023-third purification pipeline, 1024-fourth purification pipeline, 1025-fifth purification pipeline, 1026-sixth purification pipeline, 1027-seventh purification pipeline, 1028-eighth purification pipeline, 1029-ninth purification pipeline, 1030-tenth purification pipeline, 1031-eleventh purification pipeline, 1032-twelfth purification pipeline, 1033-thirteenth purification pipeline, 1034-fourteenth purification pipeline, 1035-fifteenth purification pipeline, 1036-sixteenth purification pipeline, 1037-qualified hydrogen discharge pipeline, 1038-evacuation pipeline, 1039-evacuation valve, 1040-cooling water inlet pipe, 1041-cooling water outlet pipe, 1042 — drain valve.
Detailed Description
With the attached drawing, the low-pressure alkaline water electrolysis hydrogen production system comprises an electrolysis reaction tank group 1, a hydrogen side gas-liquid separation tank 2, an oxygen side gas-liquid separation tank 3, a hydrogen side washing cooling tower 4, an oxygen side washing cooling tower 5 and a hydrogen purification unit. The hydrogen outlet of the electrolytic reaction tank group 1 is connected with the gas inlet of the hydrogen side gas-liquid separation tank 2 through a first pipeline 7, the gas outlet of the hydrogen side gas-liquid separation tank is connected with the hydrogen side washing cooling tower 4 through a second pipeline 8, and the hydrogen side washing cooling tower 4 is connected with a hydrogen discharge pipeline 9. An oxygen outlet of the electrolytic reaction tank group 1 is connected with a gas inlet of the oxygen side gas-liquid separation tank 3 through a third pipeline 10, a gas outlet of the oxygen side gas-liquid separation tank 3 is connected with an oxygen side washing cooling tower 5 through a fourth pipeline 11, and the oxygen side washing cooling tower 5 is connected with an oxygen discharge pipeline 12. The oxygen washed by the oxygen side washing cooling tower 5 is discharged through an oxygen discharge pipeline 12 and can be further collected and utilized or directly emptied. The hydrogen side gas-liquid separation tank 2 and the oxygen side gas-liquid separation tank 3 are used for separating hydrogen and oxygen generated by electrolysis from alkali liquor. The hydrogen side washing cooling tower 4 and the oxygen side washing cooling tower 5 are used for further washing a small amount of alkali liquor remained in the hydrogen and the oxygen.
Hydrogen vent line 9 connects and treats compressed hydrogen buffer tank 29, treats that compressed hydrogen buffer tank 29 connects compressed hydrogen buffer tank 31 through compression system 30, and compressed hydrogen buffer tank 31 is connected with the entrance point of hydrogen oxygen-eliminating tower 32, and deoxidization hydrogen cooler 33 is connected to the exit end of hydrogen oxygen-eliminating tower 32, and deoxidization hydrogen cooler 33 is connected and is caught ware 34. The hydrogen gas washed by the hydrogen side washing cooling tower 4 further enters a compression stage and a purification stage. The hydrogen gas buffer tank 29 to be compressed plays a role of buffering, and the outlet is connected with a compression system 30 to compress the hydrogen gas to be purified. The hydrogen enters a compressed hydrogen buffer tank 31 after being compressed, and then enters a hydrogen deoxygenation tower 32 to purify the hydrogen and remove part of mixed oxygen in the hydrogen generated by water electrolysis. The hydrogen gas passing through the hydrogen deoxygenation tower 32 enters the deoxygenated hydrogen gas cooler for condensing part of the gaseous moisture in the hydrogen gas and further trapping impurity moisture through the trapping and eliminating device. The hydrogen gas treated by the eliminator 34 enters a hydrogen purification unit for further purification.
The hydrogen purification unit comprises a hydrogen dryer, a regenerated hydrogen cooler 101, a regenerated hydrogen water separator 102, an on-off valve and a hydrogen purification pipeline. Wherein the hydrogen dryer comprises a hydrogen adsorption drying A tower 103, a hydrogen adsorption drying B tower 104 and a hydrogen adsorption drying C tower 105. The on-off valves comprise a to-be-dried air inlet A valve 106, a regenerated air exhaust A valve 107, a regenerated air drying inlet A valve 108, a dried air outlet A valve 109, a regenerated air A valve 1010, a to-be-dried air inlet B valve 1011, a regenerated air exhaust B valve 1012, a regenerated air drying inlet B valve 1013, a dried air outlet B valve 1014, a regenerated air B valve 1015, a to-be-dried air inlet C valve 1016, a regenerated air exhaust C valve 1017, a regenerated air drying inlet C valve 1018, a dried air outlet C valve 1019 and a regenerated air C valve 1020. The hydrogen gas pipes include a first purification pipe 1021, a second purification pipe 1022, a third purification pipe 1023, a fourth purification pipe 1024, a fifth purification pipe 1025, a sixth purification pipe 1026, a seventh purification pipe 1027, an eighth purification pipe 1028, a ninth purification pipe 1029, a tenth purification pipe 1030, an eleventh purification pipe 1031, a twelfth purification pipe 1032, a thirteenth purification pipe 1033, a fourteenth purification pipe 1034, a fifteenth purification pipe 1035, and the like.
As shown in the figure, the first port of the hydrogen adsorption drying a tower 103 is connected to the eliminator 34 through a first purification pipeline 1021, and a valve 106 for the air to be dried to enter the a is disposed on the first purification pipeline 1021. The second port of the hydrogen adsorption drying a column 103 is connected to a qualified hydrogen discharge pipe 1037 through a second purification pipe 1022, and a dried gas discharge a valve 109 is provided on the second purification pipe 1022. The second purification pipeline 1022 is further connected to a second port of the hydrogen adsorption drying B column 104 via a third purification pipeline 1023, and a regeneration air a valve 1010 and a regeneration air B valve 1015 are disposed on the third purification pipeline 1023. A first port of the hydrogen adsorption drying B-column 104 is connected to one port of the hydrogen regeneration cooler 101 through a fourth purification pipe 1024, a regeneration gas exhaust B valve 1012 is provided on the fourth purification pipe 1024, and the other port of the hydrogen regeneration cooler is connected to the hydrogen regeneration water separator 102 through a fifth purification pipe 1025. The first purification pipeline 1021 is connected to the first port of the hydrogen adsorption drying B-column 104 through a sixth purification pipeline 1026, and a B-valve 1011 for the air to be dried is disposed on the sixth purification pipeline. The hydrogen adsorption drying B tower is connected to a qualified hydrogen discharge pipe 1037 through a seventh purification pipe 1027, and a dry gas discharge B valve 1014 is provided on the seventh purification pipe. The first purification pipeline 1021 is further connected to the regeneration hydrogen cooler 101 through an eighth purification pipeline 1028, and a regeneration gas exhaust a valve 107 is disposed on the eighth purification pipeline 1028.
The regeneration hydrogen gas water separator 102 is connected to a first port of the hydrogen adsorption drying C tower 105 through a ninth purification pipeline 1029, a regeneration gas drying C inlet valve 1018 is arranged on the ninth purification pipeline, the hydrogen adsorption drying C tower is connected to a qualified hydrogen gas discharge pipeline through a tenth purification pipeline 1030, and a dry gas outlet C valve 1019 is arranged on the tenth purification pipeline. The first port of the hydrogen adsorption drying C tower is connected with the first purification pipeline through an eleventh purification pipeline 1031, and a valve 1016 for drying air to enter the C is arranged on the eleventh purification pipeline. The second port of the hydrogen adsorption drying column C is communicated with a third purification pipe 1023 through a twelfth purification pipe 1032, and a regeneration gas C valve 1020 is provided on the twelfth purification pipe. The eleventh purification pipe 1031 is further communicated with an eighth purification pipe 1028 through a thirteenth purification pipe 1033, and a regeneration gas exhaust C valve 1017 is disposed on the thirteenth purification pipe 1033. The regenerated hydrogen gas-water separator 102 is connected to the first purification pipeline through a fourteenth purification pipeline 1034, and a regenerated gas drying inlet a valve 108 is disposed on the fourteenth purification pipeline. The fourteenth purification pipe 1034 communicates with the sixth purification pipe via a fifteenth purification pipe 1035, and a regeneration gas dry-in B valve 1013 is provided in the fifteenth purification pipe 1035.
As a further design of the invention, the system also comprises an alkali washing water circulation tank 6, wherein an inlet of the alkali washing water circulation tank 6 is connected with a condensed water conveying pipeline 13, an outlet of the alkali washing water circulation tank is connected with an inlet of an alkali liquor cooler 15 through a fifth pipeline 14, and a first alkali liquor water replenishing pump 16 is arranged on the fifth pipeline. The outlet of the alkali liquor cooler is connected with the liquid inlet of the hydrogen side washing cooling tower 4 through a sixth pipeline 17, and the outlet of the alkali liquor cooler is connected with the liquid inlet of the oxygen side washing cooling tower 5 through a seventh pipeline 18. The liquid outlet of the hydrogen side washing cooling tower 4 and the liquid outlet of the oxygen side washing cooling tower 5 are connected with an alkali washing water circulation tank 6 through an eighth pipeline 19. The alkali washing water circulation tank 6 provides the alkali washing water needed in the hydrogen side washing cooling tower 4 and the oxygen side washing cooling tower 5. The alkali liquor washed in the hydrogen side washing and cooling tower 4 and the oxygen side washing and cooling tower 5 is further connected with an alkali washing water circulation tank 6 through an eighth pipeline 19, so that the circulation utilization of the alkali washing water is realized, the process is optimized, and the waste is reduced.
Further, a liquid outlet of the hydrogen-side gas-liquid separation tank 2 is connected to an alkali liquid circulation pump 21 through a ninth pipe 20, and a first control valve 35 is provided in the ninth pipe. The liquid outlet of the oxygen side gas-liquid separation tank is connected with a ninth pipeline or an alkali liquor circulating pump through a tenth pipeline 22, and a second control valve 23 is arranged on the tenth pipeline. The alkali liquor circulating pump is connected with an alkali liquor cooler 25 through an eleventh pipeline 24, and the alkali liquor cooler 25 is connected with an alkali liquor inlet of the electrolytic reaction tank group through a twelfth pipeline 26. The alkali liquor separated in the hydrogen side gas-liquid separation tank 2 and the oxygen side gas-liquid separation tank 3 can be conveyed back to the electrolysis reaction tank group 1 through an alkali liquor circulating pump 21, a ninth pipeline and the like for continuous recycling.
Further, the circulation tank 6 for washing soda solution is connected to the hydrogen-side gas-liquid separation tank 2 through a thirteenth pipe 27, and a second soda solution replenishing pump 28 is provided in the thirteenth pipe. The alkali washing liquid in the alkali washing water circulation tank 6 can further enter the electrolytic reaction tank group 1 through a second alkali liquid water replenishing pump 28 and an alkali liquid circulation pump 21 to replenish the alkali liquid consumed by the electrolytic reaction.
Further, a drain pipe is connected to the bottom of the regeneration hydrogen-water separator 102, and a drain valve 1042 is disposed on the drain pipe. The drainage pipeline can be further connected with a condensate water recycling pipeline. The regenerated hydrogen gas-water separator 102 traps the condensed moisture to complete the separation process of hydrogen gas and water. The water separated by the regeneration hydrogen water separator 102 may be recycled as condensed water. The regeneration hydrogen gas water separator is also connected with a hydrogen buffer tank to be compressed through a sixteenth purification pipeline 1036, the regeneration hydrogen gas water separator 102 is used for removing partial water mixed in the regeneration hydrogen gas, and the gas sent to the hydrogen buffer tank to be compressed through the sixteenth purification pipeline 1036 is mixed with the electrolyzed water crude hydrogen, so that the purification process is further completed, and the waste is reduced. The regeneration hydrogen cooler 101 is also connected to a cooling water inlet pipe 1040 and a cooling water outlet pipe 1041. The regenerated hydrogen cooler 101 is used for condensing the water discharged after the regeneration process is completed, so that the next step of hydrogen and water separation is facilitated.
The hydrogen adsorption drying column a 103, the hydrogen adsorption drying column B104, and the hydrogen adsorption drying column C105 are each provided therein with an adsorbent and a heating device. The adsorbent is used for adsorbing and purifying water in the crude hydrogen, and the heating device removes the water in the adsorbent to realize the regeneration of the adsorbent.
The qualified hydrogen gas exhaust pipe 1037 is further connected to an exhaust pipe 1038, and an exhaust valve 1039 is disposed on the exhaust pipe 1038.
A hydrogen production method by low-pressure alkaline water electrolysis adopts the system, and comprises the following steps:
(1) The electrolytic reaction tank group 1 generates water electrolysis reaction to generate hydrogen and oxygen, then the hydrogen and oxygen enter a hydrogen side gas-liquid separation tank 2 and an oxygen side gas-liquid separation tank 3 respectively to separate gas and alkali liquor, and the separated alkali liquor can be sent to the electrolytic reaction tank group 1 through a ninth pipeline 20, an alkali liquor circulating pump 21 and the like to supplement consumed electrolyte.
(2) The hydrogen and oxygen after primary gas-liquid separation are respectively conveyed to a hydrogen side washing cooling tower 4 and an oxygen side washing cooling tower 5 for further purification to remove alkali liquor mixed in the gas, and an alkali washing water circulation tank 6 provides required washing water and electrolysis water for the washing cooling tower and the electrolysis bath.
(3) And the hydrogen purified by the alkali liquor continuously enters a compression system, is compressed, then enters a hydrogen deoxygenation tower, is subjected to impurity-removing hydrogen, is treated by a deoxygenation hydrogen cooler and a capturing and eliminating device, and finally enters a purification unit.
(4) The working process of the hydrogen purification unit comprises three working periods, and the adsorption drying tower A, the adsorption drying tower B and the adsorption drying tower C sequentially complete three working states of full gas drying, regeneration and regenerated hydrogen drying, so that the cyclic regeneration of the hydrogen adsorption drying tower is realized, and the hydrogen is continuously and efficiently purified.
The working time of each working period is 4h, and the working process of the water electrolysis hydrogen purification device takes 12h as a circulation state.
In the first working period, the hydrogen purification comprises the following steps: the hydrogen to be dried after being processed by the eliminator 34 enters a hydrogen adsorption drying tower A through a first purification pipeline 1021 and a valve A106 of the air to be dried, moisture in the hydrogen is adsorbed by a molecular sieve, drying and purification of all the hydrogen are completed, then, 90% of the hydrogen flows out of qualified hydrogen through a second purification pipeline 1022 and a valve A109 of the dried air, and is conveyed through a qualified hydrogen discharge pipeline 1037 to be further collected and utilized.
And the other 10% of hydrogen enters the hydrogen adsorption drying B tower 104 through the third purification pipeline 1023, the regeneration gas A valve 1010 and the regeneration gas B valve 1015, at this time, the heating device is heated to work, the moisture adsorbed by the molecular sieve adsorbent in the last period is desorbed, the regeneration of the adsorbent is completed, and the heating device stops working. The hydrogen and the vapor flowing out continue to pass through a sixth purification pipeline 1026 and a regeneration gas exhaust valve B1012, enter the regeneration hydrogen gas cooler 101, and are condensed into liquid water, and then enter the regeneration hydrogen gas water separator 102 through a fifth purification pipeline 1025 to capture moisture.
And finally, 10% of the regenerated hydrogen enters the hydrogen adsorption drying C tower 105 through a ninth purification pipeline 1029, a regenerated gas drying inlet C valve 1018 and an eleventh purification pipeline 1031, 10% of the hydrogen is completely dried and purified, flows out through a tenth purification pipeline 1030 and a dry gas outlet C valve 1019, enters a qualified hydrogen outlet pipeline 1037, is mixed with 90% of the dry hydrogen, and is collected into qualified product hydrogen.
In the second working cycle, purifying hydrogen comprises the following steps: the hydrogen to be dried after being treated by the eliminator 34 passes through a sixth purifying pipeline 1026 and a gas to be dried enters a B valve 1011 and enters a hydrogen adsorption drying B tower 104, and moisture in the hydrogen is adsorbed, so that the drying and purification of all the hydrogen are completed. Then, 90% of the hydrogen gas is passed through the seventh purification conduit 1027 and the dry gas outlet B valve 1014 to flow out qualified hydrogen gas, and further collected for use.
And the other 10% of hydrogen enters the hydrogen adsorption drying C tower 105 through the regeneration gas B valve 1015, the twelfth purification pipeline 1032 and the regeneration gas C valve 1020, at this time, the heating device is heated to work, and the moisture adsorbed by the molecular sieve adsorbent in the last period is desorbed, so that the regeneration of the adsorbent is completed. The heating device stops working, the effluent hydrogen and water vapor continuously pass through an eleventh purification pipeline 1031, a regenerated gas exhaust valve C valve 1017 and a thirteenth purification pipeline 1033, enter the regenerated hydrogen cooler 101, are condensed into liquid water, and then enter the regenerated hydrogen water separator through a fifth purification pipeline 1025 to capture water.
And finally, 10% of the regenerated hydrogen enters the A valve 108 through the fourteenth purification pipeline 1034 and the regenerated gas drying device, enters the hydrogen adsorption drying A tower 103, is completely dried and purified for 10% of the hydrogen, flows out through the second purification pipeline 1022 and the dried gas outlet A valve 109, is mixed with 90% of the dried hydrogen, and is collected into qualified product hydrogen.
In the third working cycle, the purification of hydrogen comprises the following steps: the hydrogen to be dried treated by the eliminator 34 passes through an eleventh purification pipeline 1031 and a gas to be dried inlet C valve 1016 and enters a hydrogen adsorption drying C tower 105, and moisture in the hydrogen is adsorbed, so that the drying and purification of all hydrogen are completed. Then, 90% of the hydrogen gas flows out of the qualified hydrogen gas through the tenth purified pipe 1030 and the dry gas outlet C valve 1019, and is further collected and utilized.
And the other 10% of hydrogen enters a hydrogen adsorption drying A tower through a twelfth purification pipeline 1032, a regeneration gas C valve 1020 and a regeneration gas A valve 1010, at the moment, a heater is heated to work, and the moisture adsorbed by the molecular sieve adsorbent in the last period is desorbed, so that the regeneration of the adsorbent is completed. The heater stops working, and the effluent hydrogen and water vapor continuously pass through an eighth purification pipeline 1028 and a regeneration gas exhaust a valve 107, enter the regeneration hydrogen cooler 101, condense the water vapor into liquid water, and then enter the regeneration hydrogen water separator 102 through a fifth purification pipeline 1025 to capture moisture.
Finally, 10% of the regenerated hydrogen enters the B valve 1013 through the fifteenth purification pipeline 1035 and the regenerated gas drying, enters the hydrogen adsorption drying B tower 104, is completely dried and purified for 10% of the hydrogen, flows out through the seventh purification pipeline 1027 and the dried gas outlet B valve 1014, is mixed with 90% of the dried hydrogen, and is collected into qualified product hydrogen.
In summary, the operation status of each adsorption drying tower in three operation cycles is shown in table 1 below:
TABLE 1
Figure BDA0003851535280000101
In the above method, the hydrogen gas after trapping moisture in the regenerated hydrogen gas-water separator is transferred to the compressed hydrogen buffer tank through the sixteenth purification pipe 1036, and mixed with the electrolyzed water crude hydrogen, thereby further completing the purification process.
Parts not described in the above modes can be realized by adopting or referring to the prior art.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A low-pressure alkaline water electrolysis hydrogen production system is characterized in that: comprises an electrolytic reaction tank group, a hydrogen side gas-liquid separation tank, an oxygen side gas-liquid separation tank, a hydrogen side washing cooling tower, an oxygen side washing cooling tower and a hydrogen purification unit;
a hydrogen outlet of the electrolytic reaction tank group is connected with a gas inlet of a hydrogen side gas-liquid separation tank through a first pipeline, a gas outlet of the hydrogen side gas-liquid separation tank is connected with a hydrogen side washing cooling tower through a second pipeline, and the hydrogen side washing cooling tower is connected with a hydrogen discharge pipeline;
an oxygen outlet of the electrolytic reaction tank group is connected with a gas inlet of an oxygen side gas-liquid separation tank through a third pipeline, a gas outlet of the oxygen side gas-liquid separation tank is connected with an oxygen side washing and cooling tower through a fourth pipeline, and the oxygen side washing and cooling tower is connected with an oxygen discharge pipeline;
the hydrogen discharge pipeline is connected with a to-be-compressed hydrogen buffer tank, the to-be-compressed hydrogen buffer tank is connected with the compressed hydrogen buffer tank through a compression system, the compressed hydrogen buffer tank is connected with the inlet end of a hydrogen deaerating tower, the outlet end of the hydrogen deaerating tower is connected with a deaerating hydrogen cooler, the deaerating hydrogen cooler is connected with a capturing and eliminating device, and the capturing and eliminating device is connected with a hydrogen purification unit;
the hydrogen purification unit comprises a hydrogen dryer, a regenerated hydrogen cooler and a regenerated hydrogen water separator, wherein the hydrogen dryer comprises at least two hydrogen adsorption drying towers, namely a hydrogen adsorption drying tower A and a hydrogen adsorption drying tower B, a first port of the hydrogen adsorption drying tower A is connected with the eliminator through a first purification pipeline, a valve A for air to be dried to enter is arranged on the first purification pipeline, a second port of the hydrogen adsorption drying tower A is connected with a qualified hydrogen discharge pipeline through a second purification pipeline, and a valve A for dried air to exit is arranged on the second purification pipeline;
the second purification pipeline is also connected with a second port of the hydrogen adsorption drying tower B through a third purification pipeline, and a regeneration gas A valve and a regeneration gas B valve are arranged on the third purification pipeline; a first port of the hydrogen adsorption drying tower B is connected with one port of a regenerated hydrogen cooler through a fourth purification pipeline, a regenerated gas exhaust valve B is arranged on the fourth purification pipeline, and the other port of the regenerated hydrogen cooler is connected with a regenerated hydrogen water separator through a fifth purification pipeline;
the first purification pipeline is connected with a first port of a hydrogen adsorption drying B tower through a sixth purification pipeline, a valve B for dry air to enter is arranged on the sixth purification pipeline, the hydrogen adsorption drying B tower is connected with a qualified hydrogen discharge pipeline through a seventh purification pipeline, and a valve B for dry air to exit is arranged on the seventh purification pipeline;
the first purification pipeline is also connected with a regeneration hydrogen cooler through an eighth purification pipeline, and a regeneration gas exhaust A valve is arranged on the eighth purification pipeline.
2. The low-pressure alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: the system also comprises an alkali washing water circulation tank, wherein an inlet of the alkali washing water circulation tank is connected with a condensate water conveying pipeline, an outlet of the alkali washing water circulation tank is connected with an inlet of an alkali liquor cooler through a fifth pipeline, a first alkali liquor water replenishing pump is arranged on the fifth pipeline, an outlet of the alkali liquor cooler is connected with a liquid inlet of a hydrogen side washing and cooling tower through a sixth pipeline, and an outlet of the alkali liquor cooler is connected with a liquid inlet of an oxygen side washing and cooling tower through a seventh pipeline; and the liquid outlet of the hydrogen side washing and cooling tower and the liquid outlet of the oxygen side washing and cooling tower are connected with an alkali washing water circulation tank through an eighth pipeline.
3. A low-pressure alkaline water electrolysis hydrogen production system according to claim 1 or 2, characterized in that: a liquid outlet of the hydrogen side gas-liquid separation tank is connected with an alkali liquor circulating pump through a ninth pipeline, and a first control valve is arranged on the ninth pipeline; a liquid outlet of the oxygen side gas-liquid separation tank is connected with a ninth pipeline or an alkali liquor circulating pump through a tenth pipeline, and a second control valve is arranged on the tenth pipeline;
the alkali liquor circulating pump is connected with the alkali liquor cooler through an eleventh pipeline, and the alkali liquor cooler is connected with an alkali liquor inlet of the electrolytic reaction tank group through a twelfth pipeline.
4. A low-pressure alkaline water electrolysis hydrogen production system according to claim 3, characterized in that: and the alkali washing water circulation tank is connected with a hydrogen side gas-liquid separation tank through a thirteenth pipeline, and a second alkali liquor water replenishing pump is arranged on the thirteenth pipeline.
5. The low-pressure alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: the hydrogen desicator still includes hydrogen adsorption drying C tower, the first port of regeneration hydrogen water separator through ninth purification pipe connection hydrogen adsorption drying C tower is provided with the dry C valve that advances of regeneration gas on ninth purification pipeline, hydrogen adsorption drying C tower sets up the dry gas through the qualified hydrogen exhaust pipe of tenth purification pipe connection, goes out the C valve on tenth purification pipeline.
6. The system for producing hydrogen by low-pressure alkaline electrolysis of water according to claim 5, characterized in that: the first port of the hydrogen adsorption drying C tower is connected with a hydrogen conveying main pipeline to be dried through an eleventh purification pipeline, and an air inlet C valve to be dried is arranged on the eleventh purification pipeline;
the second port of the hydrogen adsorption drying C tower is communicated with a third purification pipeline through a twelfth purification pipeline, and a regeneration gas C valve is arranged on the twelfth purification pipeline;
the eleventh purification pipeline is also communicated with the eighth purification pipeline through a thirteenth purification pipeline, and a regeneration gas exhaust C valve is arranged on the thirteenth purification pipeline;
the regeneration hydrogen gas-water separator is connected with the first purification pipeline through a fourteenth purification pipeline, and a regeneration gas drying inlet valve A is arranged on the fourteenth purification pipeline; the fourteenth purification pipeline is communicated with the sixth purification pipeline through a fifteenth purification pipeline, and a regeneration gas drying inlet B valve is arranged on the fifteenth purification pipeline.
7. The low-pressure alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: the bottom of the regeneration hydrogen-water separator is connected with a drainage pipeline, a drainage valve is arranged on the drainage pipeline, and the regeneration hydrogen-water separator is also connected with a buffer tank for hydrogen to be compressed through a sixteenth purification pipeline; the regeneration hydrogen cooler is connected with a cooling water inlet pipe and a cooling water outlet pipe.
8. The system for producing hydrogen by low-pressure alkaline electrolysis of water according to claim 5, characterized in that: and the hydrogen adsorption drying tower A, the hydrogen adsorption drying tower B and the hydrogen adsorption drying tower C are all internally provided with an adsorbent and a heating device.
9. A method for producing hydrogen by low-pressure alkaline electrolysis of water, using a system according to any of claims 1 to 8, characterized by comprising the steps of:
(1) The electrolytic reaction tank group generates water electrolysis reaction to generate hydrogen and oxygen, then the hydrogen and oxygen enter a hydrogen side gas-liquid separation tank and an oxygen side gas-liquid separation tank respectively to separate gas and alkali liquor, and the separated alkali liquor is pumped to the electrolytic reaction tank group through a ninth pipeline and an alkali liquor circulating pump to supplement the consumed electrolyte;
(2) The hydrogen and the oxygen after the preliminary gas-liquid separation are respectively conveyed to a hydrogen side washing cooling tower and an oxygen side washing cooling tower for further purification to remove alkali liquor mixed in the gas, and an alkali washing water circulation tank provides required washing water and electrolysis water for the hydrogen side washing cooling tower, the oxygen side washing cooling tower and an electrolysis reaction tank group;
(3) The hydrogen purified by the alkali liquor continuously enters a compression system, is compressed, then enters a hydrogen deoxygenation tower, is subjected to impurity-removing hydrogen, is treated by a deoxygenation hydrogen cooler and a capturing and eliminating device, and finally enters a hydrogen purification unit;
(4) The working process of the hydrogen purification unit comprises three working periods, and the adsorption drying tower A, the adsorption drying tower B and the adsorption drying tower C sequentially complete three working states of full gas drying, regeneration and regenerated hydrogen drying, so that the cyclic regeneration of the hydrogen adsorption drying tower is realized, and the hydrogen is continuously and efficiently purified;
in the first duty cycle, purifying hydrogen comprises the steps of: the hydrogen to be dried treated by the eliminator enters a hydrogen adsorption drying tower A through a first purification pipeline and a valve A for air to be dried, moisture in the hydrogen is adsorbed by a molecular sieve to complete drying and purification of all the hydrogen, then, 90% of the hydrogen flows out of qualified hydrogen through a second purification pipeline and the valve A for air to be dried, and is discharged through a qualified hydrogen discharge pipeline to be further collected and utilized;
in addition, 10% of hydrogen enters a hydrogen adsorption drying tower B through a third purification pipeline, a regeneration gas A valve and a regeneration gas B valve, at the moment, a heating device in the hydrogen adsorption drying tower B is heated to work, the moisture adsorbed by the molecular sieve adsorbent in the last period is desorbed, the regeneration of the adsorbent is completed, and the heating device stops working; the effluent hydrogen and water vapor continuously pass through a sixth purification pipeline and a regenerated gas exhaust valve B valve and enter a regenerated hydrogen cooler, the water vapor is condensed into liquid water, and then the liquid water enters a regenerated hydrogen water separator through a fifth purification pipeline to capture water;
finally, 10% of the regenerated hydrogen enters a hydrogen adsorption drying C tower through a ninth purification pipeline, a regenerated gas drying inlet C valve and an eleventh purification pipeline, 10% of the hydrogen is thoroughly dried and purified, flows out of the C valve through a tenth purification pipeline and a dried gas outlet C valve, enters a qualified hydrogen discharge pipeline, is mixed with 90% of the dried hydrogen, and is collected into qualified product hydrogen;
in the second working cycle, purifying hydrogen comprises the following steps: the hydrogen to be dried after being treated by the catcher enters a hydrogen adsorption drying tower B through a sixth purifying pipeline and a valve B for air to be dried, and moisture in the hydrogen is adsorbed to complete the drying and purification of all the hydrogen; then, qualified hydrogen flows out from 90% of the hydrogen through a seventh purification pipeline and a dry gas outlet valve B, and is further collected and utilized;
in addition, 10% of hydrogen enters a hydrogen adsorption drying C tower through a regeneration gas B valve, a twelfth purification pipeline and a regeneration gas C valve, at the moment, a heating device is heated to work, and the moisture adsorbed by the molecular sieve adsorbent in the last period is desorbed to complete the regeneration of the adsorbent; the heating device stops working, the effluent hydrogen and water vapor continuously pass through an eleventh purification pipeline, a regenerated gas exhaust valve C and a thirteenth purification pipeline, enter a regenerated hydrogen cooler, the water vapor is condensed into liquid water, and then the liquid water enters a regenerated hydrogen water separator through a fifth purification pipeline to capture water;
finally, 10% of the regenerated hydrogen enters a hydrogen adsorption drying tower A through a fourteenth purification pipeline and a regenerated gas drying inlet valve A, 10% of the hydrogen is thoroughly dried and purified, flows out through a second purification pipeline and a dried gas outlet valve A, is mixed with 90% of the dried hydrogen, and qualified product hydrogen is collected;
in the third working cycle, the purification of hydrogen comprises the following steps: the hydrogen to be dried after being treated by the capturing and eliminating device enters a hydrogen adsorption and drying C tower through a first purifying pipeline, an eleventh purifying pipeline and a gas to be dried, and moisture in the hydrogen is adsorbed to complete the drying and purification of all the hydrogen; then, qualified hydrogen flows out from 90% of the hydrogen through a tenth purification pipeline and a dry gas outlet C valve and is further collected and utilized;
in addition, 10% of hydrogen enters a hydrogen adsorption drying tower A through a twelfth purification pipeline, a regeneration gas C valve and a regeneration gas A valve, at the moment, a heating device is heated to work, and the molecular sieve adsorbent is desorbed from the moisture adsorbed in the last period to complete the regeneration of the adsorbent; the heating device stops working, the flowing hydrogen and the flowing steam continuously pass through an eighth purification pipeline and a regenerated gas exhaust A valve, enter a regenerated hydrogen cooler, condense the steam into liquid water, and then enter a regenerated hydrogen water separator through a fifth purification pipeline to capture moisture;
and finally, 10% of the regenerated hydrogen enters a B valve through a fifteenth purification pipeline and the regenerated gas drying, enters a hydrogen adsorption drying B tower, is completely dried and purified for 10%, flows out through a seventh purification pipeline and a dried gas outlet B valve, is mixed with 90% of the dried hydrogen, and is collected into qualified product hydrogen.
10. A low-pressure alkaline water electrolysis hydrogen production method according to claim 9, characterized in that: and the hydrogen after trapping moisture in the regenerated hydrogen water separator is transmitted to the compressed hydrogen buffer tank through a sixteenth purification pipeline and is mixed with the crude hydrogen of the electrolyzed water, so that the purification process is further completed.
CN202211136056.0A 2022-09-19 2022-09-19 Low-pressure alkaline water electrolysis hydrogen production system and method Pending CN115537836A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117305906A (en) * 2023-10-18 2023-12-29 三峡科技有限责任公司 System and method for expanding load range of alkaline electrolytic cell

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117305906A (en) * 2023-10-18 2023-12-29 三峡科技有限责任公司 System and method for expanding load range of alkaline electrolytic cell

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