CN116590748A - Gas-liquid post-treatment unit and water electrolysis hydrogen production device - Google Patents
Gas-liquid post-treatment unit and water electrolysis hydrogen production device Download PDFInfo
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- CN116590748A CN116590748A CN202310628195.3A CN202310628195A CN116590748A CN 116590748 A CN116590748 A CN 116590748A CN 202310628195 A CN202310628195 A CN 202310628195A CN 116590748 A CN116590748 A CN 116590748A
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- 239000007788 liquid Substances 0.000 title claims abstract description 368
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 181
- 239000001257 hydrogen Substances 0.000 title claims abstract description 178
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 178
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 34
- 239000003792 electrolyte Substances 0.000 claims abstract description 201
- 239000001301 oxygen Substances 0.000 claims abstract description 140
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 140
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 133
- 239000007789 gas Substances 0.000 claims abstract description 96
- 230000001105 regulatory effect Effects 0.000 claims abstract description 54
- 238000001816 cooling Methods 0.000 claims abstract description 43
- 230000001276 controlling effect Effects 0.000 claims abstract description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 76
- 229910052757 nitrogen Inorganic materials 0.000 claims description 38
- 238000001704 evaporation Methods 0.000 claims description 33
- 230000008020 evaporation Effects 0.000 claims description 33
- 238000007872 degassing Methods 0.000 claims description 5
- 150000002431 hydrogen Chemical class 0.000 claims description 3
- 238000000034 method Methods 0.000 description 15
- 229910001882 dioxygen Inorganic materials 0.000 description 8
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 239000008151 electrolyte solution Substances 0.000 description 5
- 230000001502 supplementing effect Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000005465 channeling Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
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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
- 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
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/02—Process control or regulation
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/60—Constructional parts of cells
- C25B9/67—Heating or cooling means
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- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Automation & Control Theory (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention relates to a gas-liquid post-treatment unit and a water electrolysis hydrogen production device, wherein the unit comprises: the device comprises an oxygen gas-liquid separator pressure regulating module, an oxygen gas-liquid separator, a hydrogen gas-liquid separator pressure regulating module, a hydrogen gas-liquid separator, an electrolyte cooling module and an electrolyte circulating pump; the oxygen gas-liquid separator pressure regulating module is used for controlling the gas pressure of the oxygen gas-liquid separator to be within a preset pressure range; the hydrogen gas-liquid separator pressure regulating module is used for regulating the gas discharge flow of the hydrogen gas-liquid separator so that the gas pressure difference between the hydrogen gas-liquid separator and the oxygen gas-liquid separator is smaller than a first preset difference threshold; after the electrolyte discharged from the hydrogen gas-liquid separator and the oxygen gas-liquid separator is cooled by the electrolyte cooling module, the electrolyte flows into an electrolytic tank of the water electrolysis hydrogen production device through an electrolyte circulating pump, so that the purity of the separated hydrogen and oxygen is improved, and the safety of the hydrogen production device is ensured.
Description
Technical Field
The invention relates to the technical field of water electrolysis hydrogen production, in particular to a gas-liquid post-treatment unit and a water electrolysis hydrogen production device.
Background
The green hydrogen and the oxygen are very valuable resources, and the device for producing the green hydrogen and the oxygen is mainly a water electrolysis hydrogen production device. The water electrolysis hydrogen production device mainly comprises an electrolytic tank, a gas-liquid post-treatment unit, a gas purification unit and the like. The gas-liquid post-treatment unit is used for realizing gas-liquid separation and electrolyte circulation.
Currently, the gas-liquid post-treatment unit includes an oxyhydrogen gas-liquid separator (an oxyhydrogen gas-liquid separator and an oxygen gas-liquid separator), an electrolyte heat exchanger, an electrolyte circulation pump, and the like, wherein the bottoms of the oxyhydrogen gas-liquid separator are communicated through a communication line so that gas pressure between the oxyhydrogen gas-liquid separator and the oxygen gas-liquid separator is balanced. In the actual production process, after the water electrolysis hydrogen production device is started, the gas pressure in the oxygen gas-liquid separator is stabilized within a preset pressure range, and the discharge flow of the gas in the hydrogen gas-liquid separator is regulated according to the liquid level of the electrolyte in the hydrogen gas-liquid separator and the liquid level of the electrolyte in the oxygen gas-liquid separator, so that the liquid level balance of the electrolyte between the hydrogen gas-liquid separator and the oxygen gas-liquid separator is realized. And cooling the electrolyte separated by the oxyhydrogen gas-liquid separator through an electrolyte heat exchanger, and pumping the cooled electrolyte back to the electrolytic tank through an electrolyte circulating pump.
However, in the prior art, because the balance of hydrogen-oxygen side pressure needs to be maintained, a communication pipeline is arranged at the bottom of the hydrogen-oxygen gas-liquid separator, so that hydrogen in the hydrogen-oxygen gas-liquid separator easily flows into the oxygen gas-liquid separator, oxygen in the oxygen gas-liquid separator easily flows into the hydrogen gas-liquid separator, and when renewable energy sources such as wind and light are used for hydrogen production, the problem of hydrogen production power change is unstable, the hydrogen-oxygen channeling is particularly obvious, and the hydrogen-oxygen mixing is extremely explosive, so that the gas purity of the hydrogen-oxygen separator is reduced, and the safety of a hydrogen production device is seriously affected.
Disclosure of Invention
In order to solve the technical problems, the invention provides a gas-liquid post-treatment unit and a water electrolysis hydrogen production device.
The technical scheme of the invention is as follows:
the invention provides a gas-liquid post-treatment unit applied to a water electrolysis hydrogen production device, which comprises the following components: the device comprises an oxygen gas-liquid separator pressure regulating module, an oxygen gas-liquid separator, a hydrogen gas-liquid separator pressure regulating module, a hydrogen gas-liquid separator, an electrolyte cooling module and an electrolyte circulating pump;
the pressure regulating module of the oxygen gas-liquid separator is used for regulating the gas discharge flow of the oxygen gas-liquid separator so as to enable the gas pressure in the oxygen gas-liquid separator to be in a preset pressure range;
The hydrogen gas-liquid separator pressure regulating module is used for regulating the gas discharge flow of the hydrogen gas-liquid separator so that a first difference value between the gas pressure inside the hydrogen gas-liquid separator and the gas pressure inside the oxygen gas-liquid separator is smaller than a first preset difference value threshold;
the oxygen gas-liquid separator and the hydrogen gas-liquid separator are respectively communicated with the electrolyte cooling module, and electrolyte discharged by the hydrogen gas-liquid separator and the oxygen gas-liquid separator is cooled by the electrolyte cooling module and then flows into an electrolytic tank of the water electrolysis hydrogen production device through the electrolyte circulating pump.
Optionally, the pressure adjusting module of the hydrogen gas-liquid separator is specifically configured to:
acquiring a second difference between the gas pressure inside the hydrogen gas-liquid separator and the gas pressure inside the oxygen gas-liquid separator;
comparing the second difference value with the first preset difference value threshold;
and if the comparison result shows that the second difference value is not smaller than the first preset difference value threshold value, increasing the gas discharge flow of the hydrogen gas-liquid separator so that the first difference value is smaller than the first preset difference value threshold value.
Optionally, the pressure adjusting module of the hydrogen gas-liquid separator specifically includes: the differential pressure data acquisition sub-module, the first control module and the first regulating valve;
the pressure difference data acquisition sub-module is used for generating pressure difference data according to the gas pressure in the hydrogen gas-liquid separator and the gas pressure in the oxygen gas-liquid separator and sending the pressure difference data to the first control module;
the first control module is used for determining the second difference value according to the pressure difference data and sending a first control instruction to the first regulating valve according to the second difference value;
the first regulating valve is arranged on a hydrogen discharge pipeline of the hydrogen gas-liquid separator and is used for regulating the opening degree of the first regulating valve according to the first control instruction so as to realize the purpose of regulating the gas discharge flow of the hydrogen gas-liquid separator.
Optionally, the differential pressure data acquisition submodule includes a differential pressure table.
Optionally, the unit of the present invention further comprises: an electrolyte alternate discharge control module and a flash evaporation module;
the electrolyte alternative discharge control module is used for controlling the electrolytes in the hydrogen gas-liquid separator and the oxygen gas-liquid separator to be discharged to the flash evaporation module after passing through the electrolyte cooling module alternatively;
The flash evaporation module is used for degassing the electrolyte flowing into the flash evaporation module.
Optionally, the electrolyte alternate discharge control module is specifically configured to:
acquiring a first electrolyte liquid level of the hydrogen gas-liquid separator and a second electrolyte liquid level of the oxygen gas-liquid separator;
analyzing the first electrolyte level and the second electrolyte level;
and if the analysis result shows that the highest liquid level in the first electrolyte liquid level and the second electrolyte liquid level is higher than a first preset liquid level threshold, controlling the electrolyte in the gas-liquid separator corresponding to the highest liquid level to be continuously discharged to the electrolyte cooling module until the electrolyte liquid level of the other gas-liquid separator is analyzed to be higher than the first preset liquid level threshold again, and controlling the electrolyte in the other gas-liquid separator to be continuously discharged to the electrolyte cooling module.
Optionally, the electrolyte alternative discharge control module specifically includes a first liquid level meter, a first switch valve, a second liquid level meter, a second switch valve and a second control module;
the first switch valve is arranged on a first pipeline, and the hydrogen gas-liquid separator is communicated with the electrolyte cooling module through the first pipeline; the second switch valve is arranged on a second pipeline, and the oxygen gas-liquid separator is communicated with the electrolyte cooling module through the second pipeline;
The first liquid level meter is used for acquiring the first electrolyte liquid level, sending the first electrolyte liquid level to the second control module, and the second liquid level meter is used for acquiring the second electrolyte liquid level and sending the second electrolyte liquid level to the second control module; the second control module is used for analyzing the first electrolyte liquid level and the second electrolyte liquid level, if the highest liquid level in the first electrolyte liquid level and the second electrolyte liquid level is analyzed to be higher than a first preset liquid level threshold value, the electrolyte in the gas-liquid separator corresponding to the highest liquid level is continuously discharged to the electrolyte cooling module by changing the working states of the first switch valve and the second switch valve until the electrolyte liquid level of the other gas-liquid separator is analyzed to be higher than the first preset liquid level threshold value again, and the electrolyte in the other gas-liquid separator is controlled to be continuously discharged to the electrolyte cooling module.
Optionally, the second control module is further configured to:
when the working states of the first switch valve and the second switch valve are changed, the external nitrogen supply device is controlled to start to convey nitrogen to the flash evaporation module, and after a preset period of time, the nitrogen conveying to the flash evaporation module is stopped, so that the nitrogen entering the flash evaporation module replaces original hydrogen or oxygen in the flash evaporation module.
Optionally, the flash module comprises a flash tank.
Optionally, the flash module further comprises: a third switch valve and a third pipeline;
one end of the third pipeline is communicated with the inside of the flash tank, and the other end of the third pipeline is communicated with the external nitrogen supply device; the third switching valve is arranged on the third pipeline;
after the second control module is opened by controlling the third switch valve, the external nitrogen supply device starts to convey nitrogen to the flash tank through the third pipeline, and after the second control module is closed by controlling the third switch valve, the external nitrogen supply device stops conveying nitrogen to the flash tank through the third pipeline.
Optionally, the unit of the present invention further comprises: a differential pressure alarm module;
and the pressure difference alarm module is used for executing alarm action if the first difference value is not smaller than the second preset difference value threshold value.
Optionally, the pressure difference alarm module comprises a first pressure gauge, a second pressure gauge and a third control module;
the first pressure gauge is used for acquiring first gas pressure in the hydrogen gas-liquid separator and sending the first gas pressure to the third control module;
The second pressure gauge is used for acquiring second gas pressure in the oxygen gas-liquid separator and sending the second gas pressure to the third control module;
the third control module is used for analyzing the first gas pressure and the second gas pressure, and executing the alarm action if the difference value between the first pressure and the second pressure is not smaller than the second preset difference value threshold value.
The invention also provides a water electrolysis hydrogen production device, which comprises: the gas-liquid post-treatment unit and the water electrolysis hydrogen production device body are as described above;
the gas-liquid post-treatment unit is connected with an electrolytic tank in the water electrolysis hydrogen production device body.
The invention adopts the technical scheme and has the following beneficial effects:
the invention adjusts the gas discharge flow of the oxygen gas-liquid separator through the oxygen gas-liquid separator pressure adjusting module so that the gas pressure in the oxygen gas-liquid separator is in a preset pressure range, adjusts the gas discharge flow of the hydrogen gas-liquid separator through the hydrogen gas-liquid separator pressure adjusting module so that a first difference value between the gas pressure in the hydrogen gas-liquid separator and the gas pressure in the oxygen gas-liquid separator is smaller than a first preset difference value threshold, and the oxygen gas-liquid separator and the hydrogen gas-liquid separator discharge electrolyte to an electrolyte cooling module through separate pipelines respectively, wherein the oxygen gas-liquid separator and the hydrogen gas-liquid separator are not communicated.
Based on the method, the gas pressure balance and the electrolyte liquid level balance between the hydrogen gas separator and the oxygen gas separator can be realized by reasonably setting the value of the first preset difference threshold and the electrolyte discharge flow of the oxygen gas separator and the hydrogen gas separator under the condition that the bottoms of the hydrogen gas separator are prevented from being communicated. Because the bottom of the hydrogen-oxygen-gas separator is not required to be communicated, the hydrogen gas and the oxygen gas can be prevented from flowing into the oxygen-gas separator, and the oxygen in the oxygen-gas separator can be prevented from flowing into the hydrogen-gas separator, so that the safety of the hydrogen production device can be greatly improved, and the purity of the separated hydrogen and oxygen can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a gas-liquid post-treatment unit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another gas-liquid aftertreatment unit according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural view of a water electrolysis hydrogen production device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The green hydrogen and the oxygen are very valuable resources, and the device for producing the green hydrogen and the oxygen is mainly a water electrolysis hydrogen production device. The water electrolysis hydrogen production device mainly comprises an electrolytic tank, a gas-liquid post-treatment unit, a gas purification unit and the like. The gas-liquid post-treatment unit is used for realizing gas-liquid separation and electrolyte circulation.
Referring to fig. 1, currently, the gas-liquid post-treatment unit includes an oxyhydrogen gas-liquid separator (hydrogen gas-liquid separator 1101 and oxygen gas-liquid separator 1102), an electrolyte heat exchanger 1104, an electrolyte circulation pump 1105, and the like. The interface N14 and the interface N24 are communicated with each other through a liquid-phase communication line 1103 so that the gas pressure inside the hydrogen gas-liquid separator 1101 and the gas pressure inside the oxygen gas-liquid separator 1102 are balanced. The interface N11 is used for inputting hydrogen and electrolyte into the hydrogen gas-liquid separator 1101, and the interface N21 is used for inputting oxygen and electrolyte into the oxygen gas-liquid separator 1102. Electrolyte in the oxyhydrogen gas liquid separator simultaneously flows into electrolyte heat exchanger 1104 through interface N13 and interface N23. The port N12 is used for discharging hydrogen in the hydrogen gas-liquid separator 1101, and the port N22 is used for discharging oxygen in the oxygen gas-liquid separator 1102. The two ends of the pressure difference liquid level meter PDT101 are respectively connected with the hydrogen gas-liquid separator 1101 through an interface P11 and an interface P12, and are used for generating a remote liquid level signal LI101 according to the liquid level of electrolyte in the hydrogen gas-liquid separator 1101 and sending the remote liquid level signal LI101 to a liquid level control module LY101; the two ends of the pressure difference liquid level meter PDT201 are respectively connected with the oxygen gas-liquid separator 1102 through the interface P21 and the interface P22, and are used for generating a remote liquid level signal LI201 according to the electrolyte liquid level inside the oxygen gas-liquid separator 1102, and sending the remote liquid level signal LI to the liquid level control module LY101. The liquid level control module LY101 is configured to generate a liquid level difference signal LIC101 according to LI101 and LI201, and control the opening of the regulating valve LCV101 according to the LIC 101. The two ends of the pressure gauge PT201 are respectively connected with the oxygen gas-liquid separator 1102 through the interfaces P21, and are configured to generate an oxygen pressure signal PIC201 according to the gas pressure inside the oxygen gas-liquid separator 1102, and send the oxygen pressure signal PIC201 to the pressure control module PY201. The pressure control module PY201 is configured to control the opening degree of the regulator valve PCV201 according to the PIC 201. Electrolyte in the oxyhydrogen gas liquid separator flows into the electrolyte heat exchanger 1104 through the interface N1 and flows out of the electrolyte heat exchanger 1104 through the interface N2, and the electrolyte heat exchanger 1104 is used for cooling electrolyte flowing into the inside thereof. After passing through the filter, the electrolyte flowing out of the electrolyte heat exchanger 1104 is pumped back to the electrolyzer of the water electrolysis hydrogen production device by the electrolyte circulating pump 1105. A flow meter M is further provided at one end of the electrolyte circulation pump 1105, and the flow meter M is used for acquiring flow data of the electrolyte.
In the actual production process, since 1mol of hydrogen and 0.5mol of oxygen are generated after 1mol of water is electrolyzed, that is, the yield of hydrogen is higher than that of oxygen, when the hydrogen production power is changed, the pressure difference is generated between the pressures of the two sides of hydrogen and oxygen, if the pressure difference exceeds a certain range, the hydrogen produced in the hydrogen production device can penetrate through the film to enter the opposite region, so that the hydrogen and oxygen mixing seriously affects the safety, therefore, the pressure difference between the two sides of hydrogen and oxygen needs to be controlled within a certain range by arranging a liquid communication line 1103, and the electrolyte liquid level between the hydrogen and oxygen and gas separators 1101 and 1102 needs to be balanced by adjusting the gas pressure in the hydrogen and gas separator 1101. Specifically, after the water electrolysis hydrogen production device is started, the pressure gauge PT201 and the regulating valve PCV201 are interlocked to stabilize the gas pressure inside the oxygen gas-liquid separator 1102 within a preset pressure range, and the pressure difference level gauges PDT101 and PDT201 are interlocked with the regulating valve LCV101 at the same time to balance the electrolyte liquid level between the hydrogen gas-liquid separator 1101 and the oxygen gas-liquid separator 1102.
However, in the above technical solution, since the bottoms of the oxyhydrogen gas-liquid separators are communicated through the communication pipeline, hydrogen in the oxyhydrogen gas-liquid separators easily flows into the oxygen gas-liquid separators, and oxygen in the oxygen gas-liquid separators easily flows into the hydrogen gas-liquid separators. The purity of the hydrogen and the oxygen separated by the gas-liquid aftertreatment unit in the technical scheme is lower, and the safety of the hydrogen production device can be influenced when the problem of hydrogen-oxygen channeling is serious.
In order to solve the technical problems, the invention provides a gas-liquid post-treatment unit and a water electrolysis hydrogen production device, and the technical scheme of the invention is described in detail below with reference to the accompanying drawings.
The invention provides a gas-liquid post-treatment unit applied to a water electrolysis hydrogen production device, which comprises the following components: the device comprises an oxygen gas-liquid separator pressure regulating module, an oxygen gas-liquid separator, a hydrogen gas-liquid separator pressure regulating module, a hydrogen gas-liquid separator, an electrolyte cooling module and an electrolyte circulating pump.
The pressure regulating module of the oxygen gas-liquid separator is used for regulating the gas discharge flow of the oxygen gas-liquid separator so that the gas pressure in the oxygen gas-liquid separator is in a preset pressure range.
The hydrogen gas-liquid separator pressure regulating module is used for regulating the gas discharge flow of the hydrogen gas-liquid separator so that a first difference value between the gas pressure inside the hydrogen gas-liquid separator and the gas pressure inside the oxygen gas-liquid separator is smaller than a first preset difference value threshold.
The oxygen gas-liquid separator and the hydrogen gas-liquid separator are respectively communicated with the electrolyte cooling module, and electrolyte discharged by the hydrogen gas-liquid separator and the oxygen gas-liquid separator is cooled by the electrolyte cooling module and then flows into an electrolytic tank of the water electrolysis hydrogen production device through the electrolyte circulating pump.
In the embodiment of the invention, the pressure adjusting module of the hydrogen gas-liquid separator can be specifically used for:
acquiring a second difference between the gas pressure inside the hydrogen gas-liquid separator and the gas pressure inside the oxygen gas-liquid separator; then, comparing the second difference value with the first preset difference value threshold value; and if the comparison result shows that the second difference value is not smaller than the first preset difference value threshold value, increasing the gas discharge flow of the hydrogen gas-liquid separator so that the first difference value is smaller than the first preset difference value threshold value.
The hydrogen gas-liquid separator pressure regulating module may specifically include: the system comprises a differential pressure data acquisition sub-module, a first control module and a first regulating valve.
The pressure difference data acquisition sub-module is used for generating pressure difference data according to the gas pressure in the hydrogen gas-liquid separator and the gas pressure in the oxygen gas-liquid separator, and sending the pressure difference data to the first control module.
The first control module is used for determining the second difference value according to the pressure difference data and sending a first control instruction to the first regulating valve according to the second difference value.
The first regulating valve is arranged on a hydrogen discharge pipeline of the hydrogen gas-liquid separator and is used for regulating the opening degree of the first regulating valve according to the first control instruction so as to realize the purpose of regulating the gas discharge flow of the hydrogen gas-liquid separator.
Optionally, the differential pressure data acquisition sub-module may include a differential pressure table.
In a specific example, referring to fig. 2, the oxygen separator pressure regulation module may specifically include: a pressure gauge PT201, a regulating valve PV201 and a pressure control module PY201. The pressure gauge PT201 is connected to the oxygen gas-liquid separator 1102 through the port P23, and the regulating valve PV201 is disposed on an exhaust pipe of the oxygen gas-liquid separator 1102, and one end of the exhaust pipe is connected to the oxygen gas-liquid separator 1102 through the port N22. And, the hydrogen gas-liquid separator pressure regulating module may specifically include: a differential pressure meter PDT101, a regulating valve PV101 and a first control module PY101. The differential pressure meter PDT101 is connected to the hydrogen gas-liquid separator 1101 through the interface P12, and is connected to the oxygen gas-liquid separator 1102 through the interface P22. The regulator valve PV101 is provided on an exhaust line of the hydrogen gas-liquid separator 1101, and the exhaust line is connected to the hydrogen gas-liquid separator 1101 through the port N12.
In the actual production process, after the water electrolysis hydrogen production device is started, the pressure gauge PT201 and the regulating valve PV201 are linked to control the gas pressure in the oxygen gas-liquid separator 1102 to be in a preset pressure range so as to determine the operation pressure of the whole unit. Specifically, the pressure gauge PT201 is configured to acquire the gas pressure signal PISA201 inside the oxygen gas-liquid separator 1102, and send the signal PISA201 to the PY201. The PY201 is configured to analyze the PISA201, and when it is analyzed that the PISA201 is higher than a first preset pressure threshold (i.e., the value h1 in fig. 2) and smaller than a second preset pressure threshold (i.e., the value hh1 in fig. 2), control the opening of the regulator PV201 to be larger than a corresponding standard opening, so as to increase the gas discharge flow of the oxygen gas-liquid separator 1102, and further gradually reduce the gas pressure inside the oxygen gas-liquid separator 1102. And, PY201 is further configured to perform an alarm action when PISA201 is analyzed to be above a second preset pressure threshold.
Meanwhile, the first difference between the gas pressure inside the hydrogen gas-liquid separator 1101 and the gas pressure inside the oxygen gas-liquid separator 1102 is controlled to be smaller than a first preset difference threshold value by interlocking the pressure difference meter PDT101 and the regulating valve PV 101. Specifically, the pressure difference meter PDT101 is configured to generate a pressure interlock signal PIC101 according to the gas pressure inside the hydrogen gas-liquid separator 1101 and the gas pressure inside the oxygen gas-liquid separator 1102, and send the pressure interlock signal PIC101 to the PY101. The PY101 is configured to determine the second difference according to the pressure interlock signal PIC101, compare the second difference with the first preset difference threshold, and control the opening of the regulating valve PV101 according to the comparison result, so that the first difference is smaller than the first preset difference threshold.
Wherein the first predetermined difference threshold may be determined by one skilled in the art based on a pressure differential that can be tolerated between the hydrogen gas-liquid separator 1101 and the oxygen gas-liquid separator 1102.
In the embodiment of the present disclosure, a small amount of oxyhydrogen gas is often contained in the electrolyte discharged from the oxyhydrogen gas-liquid separator, and because the electrolyte may enter the electrolytic tank, oxygen may enter the hydrogen side of the electrolytic cell, hydrogen enters the oxygen side of the electrolytic cell, and the oxyhydrogen is mixed with a certain danger, and unreacted electrolyte may also reflow back to the oxyhydrogen gas-liquid separator, so the electrolyte discharged from the oxyhydrogen gas-liquid separator may flow to the oxygen gas-liquid separator, and hydrogen carried in the electrolyte may also enter the oxygen gas-liquid separator; similarly, the electrolyte discharged from the oxygen gas-liquid separator flows to the hydrogen gas-liquid separator, and oxygen carried in the electrolyte also enters the hydrogen gas-liquid separator. It can be seen that in the separation of hydrogen and oxygen, hydrogen and oxygen mixing occurs. Therefore, in order to further improve the safety of the hydrogen production apparatus and to improve the purity of the separated hydrogen and oxygen, the electrolyte discharged from the oxyhydrogen gas liquid separator may be subjected to degassing treatment.
Based on this, the unit of the embodiment of the present specification may further include: the electrolyte alternately discharges the control module and the flash evaporation module.
The electrolyte alternate discharge control module is used for controlling the electrolytes in the hydrogen gas-liquid separator and the oxygen gas-liquid separator to alternately pass through the electrolyte cooling module and then discharge to the flash evaporation module.
The flash evaporation module is used for degassing the electrolyte flowing into the flash evaporation module.
In the embodiment of the specification, the electrolyte in the hydrogen gas-liquid separator and the electrolyte in the oxygen gas-liquid separator are alternately discharged to the flash evaporation module, so that the gases released from the electrolyte in the same time period by the flash evaporation module are identical, and further, a large amount of hydrogen and oxygen can be effectively prevented from being gathered in the flash evaporation module to a certain extent, and then the flash explosion occurs.
In the embodiment of the present specification, the electrolyte alternate discharge control module may specifically be configured to:
and acquiring a first electrolyte liquid level of the hydrogen gas-liquid separator and a second electrolyte liquid level of the oxygen gas-liquid separator.
Analyzing the first electrolyte level and the second electrolyte level.
And if the analysis result shows that the highest liquid level in the first electrolyte liquid level and the second electrolyte liquid level is higher than a first preset liquid level threshold, controlling the electrolyte in the gas-liquid separator corresponding to the highest liquid level to be continuously discharged to the electrolyte cooling module until the electrolyte liquid level of the other gas-liquid separator is analyzed to be higher than the first preset liquid level threshold again, and controlling the electrolyte in the other gas-liquid separator to be continuously discharged to the electrolyte cooling module.
In the embodiment of the specification, the electrolyte alternate discharge control module may specifically include a first liquid level meter, a first switch valve, a second liquid level meter, a second switch valve and a second control module.
The first switch valve is arranged on a first pipeline, and the hydrogen gas-liquid separator is communicated with the electrolyte cooling module through the first pipeline; the second switch valve is arranged on a second pipeline, and the oxygen gas-liquid separator is communicated with the electrolyte cooling module through the second pipeline.
The first liquid level meter is used for acquiring the first electrolyte liquid level, sending the first electrolyte liquid level to the second control module, and the second liquid level meter is used for acquiring the second electrolyte liquid level and sending the second electrolyte liquid level to the second control module; the second control module is used for analyzing the first electrolyte liquid level and the second electrolyte liquid level, if the highest liquid level in the first electrolyte liquid level and the second electrolyte liquid level is analyzed to be higher than a first preset liquid level threshold value, the electrolyte in the gas-liquid separator corresponding to the highest liquid level is continuously discharged to the electrolyte cooling module by changing the working states of the first switch valve and the second switch valve until the electrolyte liquid level of the other gas-liquid separator is analyzed to be higher than the first preset liquid level threshold value again, and the electrolyte in the other gas-liquid separator is controlled to be continuously discharged to the electrolyte cooling module.
In a specific example, referring to fig. 2, the electrolyte alternate discharge control module may specifically include: level gauge LT101, level gauge LT201, on-off valve KV101, on-off valve KV201, and a second control module (not labeled in fig. 2). The liquid level meter LT101 is connected to the hydrogen gas-liquid separator 1101 through the interface L11 and the interface L12. Level gauge LT201 is connected to oxygen gas-liquid separator 1102 through interface L21 and interface L22. The switching valve KV101 is disposed on a liquid discharge line of the hydrogen gas-liquid separator 1101, and the liquid discharge line is connected to the hydrogen gas-liquid separator 1101 through the interface N13 and to the electrolyte heat exchanger 1104 (i.e., the electrolyte cooling module) through the interface N1. The switching valve KV201 is disposed on a drain line of the oxygen gas-liquid separator 1102, and the drain line is connected to the oxygen gas-liquid separator 1102 through a port N23 and to the electrolyte heat exchanger 1104 through a port N1.
In actual production, when electrolyte is injected thereto, the electrolyte level of one of the oxyhydrogen gas liquid separators is controlled to be higher than a first preset level threshold (i.e., H value in fig. 2) and lower than a second preset level threshold (i.e., HH value in fig. 2), and the electrolyte level of the other one of the oxyhydrogen gas liquid separators is controlled to be lower than a third preset level threshold (i.e., L value in fig. 2) and higher than a fourth preset level threshold (i.e., LL value in fig. 2). Assume that the electrolyte level controlling the hydrogen gas liquid separator 1101 is above a first preset level threshold and below a second preset level threshold, and the electrolyte level controlling the oxygen gas liquid separator 1102 is below a third preset level threshold and above a fourth preset level threshold.
Then, after the water electrolysis hydrogen production apparatus starts to operate, the liquid level meter LT101 is used to acquire the electrolyte liquid level information LISA101 of the hydrogen gas-liquid separator 1101, and send it to the second control module. The liquid level meter LT201 is configured to acquire electrolyte level information LISA201 of the oxygen gas-liquid separator 1102, and send the information to the second control module. The second control module is configured to analyze the LISA101 and the LISA201, and if it is analyzed that the LISA101 is higher than a first preset liquid level threshold and the LISA201 is lower than a third preset liquid level threshold, control the switch valve KV101 to be opened and the switch valve KV201 to be closed. Since the hydrogen gas-liquid separator 1101 continuously discharges the electrolyte and the oxygen gas-liquid separator 1102 does not discharge the electrolyte after the on-off valve KV101 is opened and the on-off valve KV201 is closed, the electrolyte level of the hydrogen gas-liquid separator 1101 is lower than the third preset level threshold and the electrolyte level of the oxygen gas-liquid separator 1102 is higher than the first preset level threshold after a period of time. Therefore, after the second control module analyzes the situation from the data collected by the liquid level meter LT101 and the liquid level meter LT201, the on-off valve KV101 is controlled to be closed, and the on-off valve KV201 is controlled to be opened, so that the electrolyte of the oxygen gas liquid separator 1102 flows into the electrolyte cooling module. By this circulation, the alternate discharge of the electrolyte of the hydrogen gas-liquid separator 1101 and the electrolyte of the oxygen gas-liquid separator 1102 is controlled.
In this embodiment of the present disclosure, the second control module may further be configured to:
when the working states of the first switch valve and the second switch valve are changed, the external nitrogen supply device is controlled to start to convey nitrogen to the flash evaporation module, and after a preset period of time, the nitrogen conveying to the flash evaporation module is stopped, so that the nitrogen entering the flash evaporation module replaces original hydrogen or oxygen in the flash evaporation module.
In embodiments of the present disclosure, the flash module may include a flash tank.
In embodiments of the present disclosure, the flash module may further include: a third switch valve and a third pipeline;
one end of the third pipeline is communicated with the inside of the flash tank, and the other end of the third pipeline is communicated with the external nitrogen supply device; the third switching valve is arranged on the third pipeline.
After the second control module is opened by controlling the third switch valve, the external nitrogen supply device starts to convey nitrogen to the flash tank through the third pipeline, and after the second control module is closed by controlling the third switch valve, the external nitrogen supply device stops conveying nitrogen to the flash tank through the third pipeline.
In a specific example, referring to fig. 2, a flash module can include a flash tank 2101, a nitrogen make-up valve 2102, and a line in which the nitrogen make-up valve 2102 is located. The flash tank 2101 is provided with interfaces N3, N4, N5 and N6, wherein the interface N3 is connected with an interface N2 of the electrolyte heat exchanger 1104, the interface N4 is connected with a pipeline where the nitrogen supplementing valve 2102 is located, the interface N5 is connected with an exhaust pipeline of the flash tank 2101, and the interface N6 is connected with the filter 2103.
In the actual production process, when the working states of the switch valve KV101 and the switch valve KV201 are changed (i.e., when the separator for discharging the electrolyte is changed), the second control module controls the nitrogen supplementing valve 2102 to be opened, so that nitrogen in the external nitrogen supplying device flows into the flash tank 2101 through a pipeline where the nitrogen supplementing valve 2102 is located, and then the nitrogen flowing into the flash tank 2101 displaces gas (hydrogen or oxygen) in the gas phase space of the flash tank 2101, thereby preventing flash explosion caused by mixing of the hydrogen and the oxygen. Wherein, after the second control module controls the nitrogen supplementing valve 2102 to be opened each time, the nitrogen supplementing valve 2102 is closed after a preset time period. The preset time period can be set by those skilled in the art according to actual needs, so long as the gas in the gas phase space of the flash tank 2101 can be ensured to be displaced.
After the degassing treatment of the electrolytic solution in the flash tank 2101, the electrolytic solution flows to the electrolytic solution circulation pump 1105 through the filter 2103, and the electrolytic solution circulation pump 1105 returns the electrolytic solution to the electrolytic tank.
In addition, in the embodiment of the present disclosure, in order to improve the gas separation efficiency, two sets of electrolyte cooling modules (i.e., a first electrolyte cooling module and a second electrolyte cooling module) and two sets of flash evaporation modules (i.e., a first flash evaporation module and a second flash evaporation module) may be disposed in the unit, where the first electrolyte cooling module is connected to the hydrogen gas-liquid separator 1101 and the first flash evaporation module, and the first flash evaporation module is further connected to the electrolyte circulation pump 1105, so that the electrolyte discharged from the hydrogen gas-liquid separator 1101 can be cooled by a specific electrolyte cooling module, and then degassed by a specific flash evaporation module, and finally returned to the electrolytic tank by the electrolyte circulation pump 1105. Similarly, the second electrolyte cooling module is connected to the oxygen gas-liquid separator 1102 and the second flash module, respectively, and the second flash module is also connected to the electrolyte circulation pump 1105. It should be noted that, in this example, each separator corresponds to a specific flash module, and a situation that hydrogen and oxygen are simultaneously collected in one flash module does not occur, so that nitrogen is not required to be used for gas replacement in the flash module in this example.
In addition, in the embodiment of the present disclosure, when the second control module analyzes that the electrolyte level of any separator is higher than the second preset level threshold or lower than the fourth preset level threshold through the data collected by the level meter LT101 and the level meter LT201, an alarm action may be executed, so that the relevant staff can timely learn the situation according to the alarm information, and further timely process the situation.
In the embodiment of the present specification, the unit of the embodiment of the present specification may further include: and the pressure difference alarm module.
The pressure difference alarm module is used for executing alarm action if the first difference value is not smaller than the second preset difference value threshold value; the second preset difference threshold is greater than the first preset difference threshold.
In the embodiment of the specification, the pressure difference alarm module may include a first pressure gauge, a second pressure gauge and a third control module.
The first pressure gauge is used for acquiring first gas pressure in the hydrogen gas-liquid separator and sending the first gas pressure to the third control module.
The second pressure gauge is used for acquiring second gas pressure in the oxygen gas-liquid separator and sending the second gas pressure to the third control module.
The third control module is used for analyzing the first gas pressure and the second gas pressure, and executing the alarm action if the difference value between the first pressure and the second pressure is not smaller than the second preset difference value threshold value.
In one specific example, referring to FIG. 2, the pressure differential alarm module may include a pressure gauge PT101, a pressure gauge PT202, and a third control module (not labeled in FIG. 2). The pressure gauge PT101 is connected to the hydrogen gas-liquid separator 1101 through the port P11, and the pressure gauge PT202 is connected to the oxygen gas-liquid separator 1102 through the port P21. In the actual production process, the pressure gauge PT101 is used to acquire the gas pressure signal PI101 of the hydrogen gas-liquid separator 1101, and send it to the third control module. The pressure gauge PT202 is configured to acquire the gas pressure signal PI202 of the oxygen gas-liquid separator 1102, and send the signal to the third control module. The third control module is configured to calculate a pressure difference PDS101 between the hydrogen gas-liquid separator 1101 and the oxygen gas-liquid separator 1102 according to PI101 and PI202, analyze the pressure difference, and if the pressure difference is analyzed to be not smaller than the second preset difference threshold (i.e., HH2 in fig. 2, where HH2 may be equal to HH in fig. 2), execute the alarm action, so that a relevant worker can timely learn about the situation according to alarm information, and further timely process the situation.
Based on the same inventive concept, the invention also provides a water electrolysis hydrogen production device. FIG. 3 is a schematic structural view of a water electrolysis hydrogen production device according to an embodiment of the present invention. As shown in fig. 3, the present apparatus includes: a gas-liquid post-treatment unit 31 and a water electrolysis hydrogen production apparatus body 32 as described above.
The gas-liquid post-treatment unit 31 is connected to an electrolytic bath 311 in the water electrolysis hydrogen production device body 32.
In the embodiment of the present disclosure, the water electrolysis hydrogen production apparatus body 32 is a prior art, and the structure thereof will not be described here.
For the foregoing method embodiments, for simplicity of explanation, the methodologies are shown as a series of acts, but one of ordinary skill in the art will appreciate that the present invention is not limited by the order of acts, as some steps may, in accordance with the present invention, occur in other orders or concurrently. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other. For the apparatus class embodiments, the description is relatively simple as it is substantially similar to the method embodiments, and reference is made to the description of the method embodiments for relevant points.
The steps in the method of each embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs, and the technical features described in each embodiment can be replaced or combined.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software unit executed by a processor, or in a combination of the two. The software elements may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. A gas-liquid post-treatment unit for a water electrolysis hydrogen production device, comprising: the device comprises an oxygen gas-liquid separator pressure regulating module, an oxygen gas-liquid separator, a hydrogen gas-liquid separator pressure regulating module, a hydrogen gas-liquid separator, an electrolyte cooling module and an electrolyte circulating pump;
the pressure regulating module of the oxygen gas-liquid separator is used for regulating the gas discharge flow of the oxygen gas-liquid separator so as to enable the gas pressure in the oxygen gas-liquid separator to be in a preset pressure range;
the hydrogen gas-liquid separator pressure regulating module is used for regulating the gas discharge flow of the hydrogen gas-liquid separator so that a first difference value between the gas pressure inside the hydrogen gas-liquid separator and the gas pressure inside the oxygen gas-liquid separator is smaller than a first preset difference value threshold;
The oxygen gas-liquid separator and the hydrogen gas-liquid separator are respectively communicated with the electrolyte cooling module, and electrolyte discharged by the hydrogen gas-liquid separator and the oxygen gas-liquid separator is cooled by the electrolyte cooling module and then flows into an electrolytic tank of the water electrolysis hydrogen production device through the electrolyte circulating pump.
2. The unit according to claim 1, characterized in that the hydrogen gas-liquid separator pressure regulation module is specifically adapted to:
acquiring a second difference between the gas pressure inside the hydrogen gas-liquid separator and the gas pressure inside the oxygen gas-liquid separator;
comparing the second difference value with the first preset difference value threshold;
and if the comparison result shows that the second difference value is not smaller than the first preset difference value threshold value, increasing the gas discharge flow of the hydrogen gas-liquid separator so that the first difference value is smaller than the first preset difference value threshold value.
3. The unit according to claim 2, characterized in that the hydrogen gas-liquid separator pressure regulating module comprises in particular: the differential pressure data acquisition sub-module, the first control module and the first regulating valve;
the pressure difference data acquisition sub-module is used for generating pressure difference data according to the gas pressure in the hydrogen gas-liquid separator and the gas pressure in the oxygen gas-liquid separator and sending the pressure difference data to the first control module;
The first control module is used for determining the second difference value according to the pressure difference data and sending a first control instruction to the first regulating valve according to the second difference value;
the first regulating valve is arranged on a hydrogen discharge pipeline of the hydrogen gas-liquid separator and is used for regulating the opening degree of the first regulating valve according to the first control instruction so as to realize the purpose of regulating the gas discharge flow of the hydrogen gas-liquid separator.
4. A unit according to claim 3, wherein the differential pressure data acquisition submodule comprises a differential pressure meter.
5. The unit according to any one of claims 1 to 4, further comprising: an electrolyte alternate discharge control module and a flash evaporation module;
the electrolyte alternative discharge control module is used for controlling the electrolytes in the hydrogen gas-liquid separator and the oxygen gas-liquid separator to be discharged to the flash evaporation module after passing through the electrolyte cooling module alternatively;
the flash evaporation module is used for degassing the electrolyte flowing into the flash evaporation module.
6. The unit according to claim 5, characterized in that said electrolyte alternate discharge control module is specifically configured to:
acquiring a first electrolyte liquid level of the hydrogen gas-liquid separator and a second electrolyte liquid level of the oxygen gas-liquid separator;
Analyzing the first electrolyte level and the second electrolyte level;
and if the analysis result shows that the highest liquid level in the first electrolyte liquid level and the second electrolyte liquid level is higher than a first preset liquid level threshold, controlling the electrolyte in the gas-liquid separator corresponding to the highest liquid level to be continuously discharged to the electrolyte cooling module until the electrolyte liquid level of the other gas-liquid separator is analyzed to be higher than the first preset liquid level threshold again, and controlling the electrolyte in the other gas-liquid separator to be continuously discharged to the electrolyte cooling module.
7. The unit according to claim 6, wherein the electrolyte alternate discharge control module comprises in particular a first level gauge, a first on-off valve, a second level gauge, a second on-off valve and a second control module;
the first switch valve is arranged on a first pipeline, and the hydrogen gas-liquid separator is communicated with the electrolyte cooling module through the first pipeline; the second switch valve is arranged on a second pipeline, and the oxygen gas-liquid separator is communicated with the electrolyte cooling module through the second pipeline;
the first liquid level meter is used for acquiring the first electrolyte liquid level, sending the first electrolyte liquid level to the second control module, and the second liquid level meter is used for acquiring the second electrolyte liquid level and sending the second electrolyte liquid level to the second control module; the second control module is used for analyzing the first electrolyte liquid level and the second electrolyte liquid level, if the highest liquid level in the first electrolyte liquid level and the second electrolyte liquid level is analyzed to be higher than a first preset liquid level threshold value, the electrolyte in the gas-liquid separator corresponding to the highest liquid level is continuously discharged to the electrolyte cooling module by changing the working states of the first switch valve and the second switch valve until the electrolyte liquid level of the other gas-liquid separator is analyzed to be higher than the first preset liquid level threshold value again, and the electrolyte in the other gas-liquid separator is controlled to be continuously discharged to the electrolyte cooling module.
8. The unit of claim 7, wherein the second control module is further configured to:
when the working states of the first switch valve and the second switch valve are changed, the external nitrogen supply device is controlled to start to convey nitrogen to the flash evaporation module, and after a preset period of time, the nitrogen conveying to the flash evaporation module is stopped, so that the nitrogen entering the flash evaporation module replaces original hydrogen or oxygen in the flash evaporation module.
9. The unit of claim 8, wherein the flash module comprises a flash tank.
10. The unit of claim 9, wherein the flash module further comprises: a third switch valve and a third pipeline;
one end of the third pipeline is communicated with the inside of the flash tank, and the other end of the third pipeline is communicated with the external nitrogen supply device; the third switching valve is arranged on the third pipeline;
after the second control module is opened by controlling the third switch valve, the external nitrogen supply device starts to convey nitrogen to the flash tank through the third pipeline, and after the second control module is closed by controlling the third switch valve, the external nitrogen supply device stops conveying nitrogen to the flash tank through the third pipeline.
11. The unit according to any one of claims 1 to 4, further comprising: a differential pressure alarm module;
and the pressure difference alarm module is used for executing alarm action if the first difference value is not smaller than the second preset difference value threshold value.
12. The unit of claim 11, wherein the pressure differential alarm module comprises a first pressure gauge, a second pressure gauge, and a third control module;
the first pressure gauge is used for acquiring first gas pressure in the hydrogen gas-liquid separator and sending the first gas pressure to the third control module;
the second pressure gauge is used for acquiring second gas pressure in the oxygen gas-liquid separator and sending the second gas pressure to the third control module;
the third control module is used for analyzing the first gas pressure and the second gas pressure, and executing the alarm action if the difference value between the first pressure and the second pressure is not smaller than the second preset difference value threshold value.
13. A water electrolysis hydrogen production apparatus, comprising: a gas-liquid post-treatment unit and hydro-electrolytic hydrogen production device body as claimed in any one of claims 1 to 12;
The gas-liquid post-treatment unit is connected with an electrolytic tank in the water electrolysis hydrogen production device body.
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