CN115011999B - High-precision active pressure control method for alkaline water electrolysis tank - Google Patents
High-precision active pressure control method for alkaline water electrolysis tank Download PDFInfo
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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
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- C25B1/00—Electrolytic production of inorganic compounds or non-metals
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- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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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
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- C—CHEMISTRY; METALLURGY
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- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
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Abstract
The application relates to a high-precision active pressure control method for an alkaline water electrolysis cell, which comprises the following steps of: acquiring external input power of the electrolytic tank and real-time pressure inside the electrolytic tank under a fluctuation working condition; determining the power range of external input power, determining a pressure set value according to the power range of the external input power, and stabilizing the pressure in the electrolytic tank to the pressure set value; if the external input power is increased or decreased, the opening degree of the pressure regulating valve to be changed is determined according to the power change value, and the opening degree of the pressure regulating valve is gradually increased or decreased. Compared with the prior art, the method and the device have the advantages that the opening of the pressure regulating valve is roughly regulated by determining the pressure set value through acquiring the external input power in real time, and then the opening of the pressure regulating valve is finely regulated according to the increase and decrease of the external input power, and two different pressure regulating valves with high-precision large flow and low-precision small flow are adopted, so that the method and the device can adapt to pressure changes under different fluctuation working conditions, and meet the requirement of pressure stability.
Description
Technical Field
The application relates to the technical field of hydrogen production by water electrolysis, in particular to a high-precision active pressure control method for an alkaline water electrolysis tank.
Background
The renewable energy sources are utilized to produce hydrogen, such as the electricity generated by renewable energy sources such as wind energy, solar energy and the like is utilized to produce hydrogen by water electrolysis, so that the electricity resource can be saved, the energy source utilization structure of the traditional water electrolysis hydrogen production is optimized, and the large-scale hydrogen production is realized. The alkaline water electrolyzer is the most mature electrolyzer applied in industrial water electrolysis and is the key equipment of renewable energy source water electrolysis hydrogen production technology. However, when electric power generated by new energy sources such as wind, light and the like is used as input of the water electrolysis hydrogen production equipment to produce hydrogen by electrolysis, the input current has the characteristics of fluctuation and intermittence, namely a fluctuation working condition can occur, the traditional water electrolysis hydrogen production equipment has insufficient response force under the fluctuation working condition, and the design of the traditional electrolytic tank still lacks consideration of the fluctuation working condition.
In general, the pressure of an existing alkaline electrolyzer is controlled by a single gas pressure regulating valve on the hydrogen side and a single gas pressure regulating valve on the oxygen side, with the pressure within the electrolyzer being monitored by a pressure sensor. However, under the fluctuation working condition, the production rate of hydrogen fluctuates along with the input power, the gas production amounts of the hydrogen side and the oxygen side are different, the pressure on the hydrogen side and the oxygen side can fluctuate under the fluctuation working condition, and the pressure stability under various fluctuation working conditions can not be met due to the limited precision of a single gas regulating valve, so that the hydrogen production efficiency, the hydrogen quality and the safety of a hydrogen production device can be influenced, the running cost of an electrolytic tank is increased, and the service life of equipment is shortened.
Disclosure of Invention
The application aims to overcome the defects of the prior art and provide a high-precision active pressure control method for an alkaline water electrolytic tank, which is characterized in that the opening degree of a pressure regulating valve is roughly regulated by determining a pressure set value by acquiring external input power in real time, and then the opening degree of the pressure regulating valve is finely regulated according to the increase and decrease of the external input power, and two different pressure regulating valves with high precision, large flow and low precision and small flow are adopted, so that the pressure control method can adapt to pressure changes under different fluctuation working conditions and meet the requirement of pressure stabilization.
The aim of the application can be achieved by the following technical scheme:
the high-precision active pressure control method for the alkaline water electrolysis tank is realized based on a high-precision pressure control system, wherein the high-precision pressure control system comprises a control unit, a pressure sensor and a pressure regulating valve, the control unit is connected with the pressure sensor and the pressure regulating valve, and the pressure sensor is provided with two groups which are respectively connected with a hydrogen side outlet and an oxygen side outlet of the electrolysis tank and used for measuring pressure data in the electrolysis tank; the pressure regulating valves are provided with two groups, are respectively arranged at a hydrogen side outlet and an oxygen side outlet of the electrolytic tank and are used for regulating the pressure in the electrolytic tank, each group of pressure regulating valves comprises a large-flow regulating valve and a small-flow regulating valve, and the large-flow regulating valves are connected in parallel with the small-flow regulating valves;
specifically, the high-precision active pressure control method comprises the following steps:
s1, acquiring external input power of an electrolytic tank and real-time pressure inside the electrolytic tank under a fluctuation working condition;
s2, determining a power range of external input power, determining a pressure set value according to the power range of the external input power, and stabilizing the pressure in the electrolytic tank to the pressure set value;
and S3, if the external input power is increased, determining a current variation according to the power variation value, determining a gas variation according to the current variation, determining the opening degree of the pressure regulating valve to be changed according to the gas variation, gradually increasing the opening degree of the pressure regulating valve, and if the external input power is reduced, determining the current variation according to the power variation, determining the gas variation according to the current variation, determining the opening degree of the pressure regulating valve to be changed according to the gas variation, and gradually decreasing the opening degree of the pressure regulating valve.
Preferably, in step S2, a plurality of power ranges are preset, and a corresponding pressure setting value is preset for each power range.
Preferably, the rated input power of the electrolytic cell is X0, the working range is 0.3X0-1.2X0, the rated working pressure of the electrolytic cell under the rated power X0 is P0, the external input power X1 is obtained, if 0.3X0 is less than or equal to X1 and less than or equal to 0.5X0, the pressure set value P1= 0.5P0, if 0.5X0< X1 is less than or equal to 0.8X0, the pressure set value P1= 0.75P0, and if 0.8X0< X1 is less than or equal to 1.2X0, the pressure set value P1=P0.
Preferably, the external input power X1 is obtained, and when the X1 is more than or equal to 0.3X0 and less than or equal to 0.5X0, a small flow regulating valve is used for regulating the pressure; when 0.5X0< X1 is less than or equal to 0.8X0, using a large-flow regulating valve to regulate the pressure; when 0.8X0< X1 is less than or equal to 1.2X0, the large-flow regulating valve and the small-flow regulating valve work simultaneously to regulate pressure.
Preferably, in step S3, the gas variation includes a hydrogen variation and an oxygen variation, and the hydrogen variation Δh 2 And oxygen variation Δo 2 Meeting the current variation delta IThe following relationship:
ΔO 2 ＝ΔI/(4F)
wherein DeltaH 2 And DeltaO 2 In mol/s, F is the Faraday coefficient and the value is 96500C/mol.
Preferably, the high-precision pressure control system further comprises pressure maintaining valves, wherein the pressure maintaining valves are provided with two groups, and the two groups of pressure maintaining valves are respectively arranged at a hydrogen side outlet and an oxygen side outlet of the electrolytic tank and are used for maintaining the pressure inside the electrolytic tank.
Preferably, the large flow regulating valve and the small flow regulating valve are electromagnetic regulating valves.
Preferably, the control unit is connected with the pressure sensor and the pressure regulating valve through signal data lines.
Preferably, the control unit comprises a data acquisition module, an operation module and an execution module; the data acquisition module is connected with an external input power supply and a pressure sensor of the electrolytic cell and is used for acquiring the external input power of the electrolytic cell and the real-time pressure inside the electrolytic cell; the operation module is connected with the data acquisition module and the execution module and is used for calculating the opening of the pressure regulating valve according to the external input power and the real-time pressure; the execution module is connected with the pressure regulating valve and is used for controlling the opening degree of the pressure regulating valve according to the output of the operation module.
Preferably, the high-precision pressure control system further comprises an alarm, and the alarm is connected with the control unit and used for sending out an alarm signal.
Preferably, the alarm comprises a buzzer and an LED lamp.
Preferably, the high-precision pressure control system further comprises a display screen, and the display screen is connected with the control unit.
Preferably, the display screen is a touch display screen.
Preferably, the display screen is connected with the control unit through a signal data line.
Compared with the prior art, the application has the following beneficial effects:
(1) The external input power can change under the fluctuation working condition to cause pressure fluctuation, so that the pressure set value is determined according to the power interval where the external input power is located, the pressure in the electrolytic tank is initially stabilized, the pressure of the electrolytic tank is adjusted in real time according to the increase or decrease of the external input power, the electrolytic tank can be maintained to work in the optimal pressure interval, the dynamic working condition is adapted, the efficiency of the electrolytic tank is improved, the hydrogen and oxygen mixing caused by unbalanced pressure in the electrolytic tank is avoided, and the stability and the safety of the electrolytic tank are improved.
(2) The pressure regulating valves comprise a large-flow regulating valve and a small-flow regulating valve, two different pressure regulating valves with high precision and low precision and small flow are adopted, the large-flow regulating valve is used for stabilizing pressure, the small-flow regulating valve is used for accurately controlling the pressure range, various pressure regulating strategies can be provided, and therefore pressure changes under different fluctuation working conditions can be adapted, and the requirement of pressure stabilization is met.
Drawings
FIG. 1 is a flow chart of a high-precision active pressure control method for an alkaline water electrolyzer;
FIG. 2 is a schematic diagram of a high-precision pressure control system;
reference numerals: 1. the device comprises a control unit, a pressure sensor, a large-flow regulating valve, a small-flow regulating valve, a pressure maintaining valve and an electrolytic tank, wherein the control unit comprises a control unit, a pressure sensor, a large-flow regulating valve, a small-flow regulating valve, a pressure maintaining valve and an electrolytic tank.
Detailed Description
The application will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present application, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present application is not limited to the following examples.
In the drawings, like structural elements are referred to by like reference numerals and components having similar structure or function are referred to by like reference numerals. The dimensions and thickness of each component shown in the drawings are arbitrarily shown, and the present application is not limited to the dimensions and thickness of each component. Some of the elements in the drawings are exaggerated where appropriate for clarity of illustration.
Example 1:
the high-precision active pressure control method for the alkaline water electrolysis tank is realized based on a high-precision pressure control system, as shown in fig. 2, wherein the high-precision pressure control system comprises a control unit 1, a pressure sensor 2, a pressure maintaining valve 5 and a pressure regulating valve, the control unit 1 is connected with the pressure sensor 2 and the pressure regulating valve, and the control unit 1 is also connected with an external power supply so as to acquire external input power;
the pressure sensor 2 is provided with two groups, which are respectively connected with a hydrogen side outlet and an oxygen side outlet of the electrolytic tank 6 and are used for measuring pressure data in the electrolytic tank 6; the pressure maintaining valve 5 is provided with two groups of hydrogen side outlets and oxygen side outlets which are respectively arranged in the electrolytic tank 6 and used for maintaining the pressure in the electrolytic tank 6; the pressure regulating valves are provided with two groups which are respectively arranged at a hydrogen side outlet and an oxygen side outlet of the electrolytic tank 6 and are used for regulating the pressure inside the electrolytic tank 6, each group of pressure regulating valves comprises a large-flow regulating valve 3 and a small-flow regulating valve 4, and the large-flow regulating valve 3 is connected with the small-flow regulating valve 4 in parallel.
During operation of the electrolyzer 6, the external input power determines the magnitude of the current in the electrolyzer 6, which in turn determines the magnitude of the gas production. The application designs a high-precision pressure control system, which is characterized in that a new energy source is used as an external input power source to bring complex fluctuation working conditions, the gas production is larger in a high-power interval and smaller in a low-power interval, in order to match with pressure fluctuation brought by the fluctuation of the external input power and meet the requirement of pressure stabilization, a group of pressure regulating valves comprise a large-flow regulating valve 3 and a small-flow regulating valve 4, two different pressure regulating valves with high precision and large flow and low precision are adopted, the large-flow regulating valve 3 is used for stabilizing the pressure, the small-flow regulating valve 4 is used for precisely controlling the pressure range, and the large-flow regulating valve 3 and the small-flow regulating valve 4 can be independently used and also can be matched for use, so that the pressure control system can adapt to pressure variation under different fluctuation working conditions and meet the requirement of pressure stabilization.
In this embodiment, the control unit 1 is connected to the pressure sensor 2 and the pressure regulating valve via signal data lines. The large flow regulating valve 3 and the small flow regulating valve 4 are electromagnetic regulating valves, and are easy to control.
Specifically, the control unit 1 comprises a data acquisition module, an operation module and an execution module; the data acquisition module is connected with an external input power supply of the electrolytic tank 6 and the pressure sensor 2 and is used for acquiring the external input power of the electrolytic tank 6 and the real-time pressure inside the electrolytic tank 6; the operation module is connected with the data acquisition module and the execution module and is used for calculating the opening of the pressure regulating valve according to the external input power and the real-time pressure; the execution module is connected with the pressure regulating valve and used for controlling the opening degree of the pressure regulating valve according to the output of the operation module. The control unit 1 can determine a proper pressure value, the opening degree of the pressure regulating valve is controlled by PID control logic, the low-precision large-flow regulating valve 3 is mainly used for stabilizing the pressure of the water electrolysis tank, and the high-precision small-flow regulating valve 4 is used for precisely controlling the pressure range.
In addition, in order to further optimize the pressure control system of the electrolytic tank 6, in this embodiment, the pressure control system further includes an alarm connected with the control unit 1, and configured to send an alarm signal, so that the alarm can be given to prompt a worker to process under abnormal conditions such as too high pressure, too low pressure, too high external input power, too low external input power, and the like. The alarm comprises a buzzer and an LED lamp, and can send out an audible and visual alarm signal. The pressure control system also comprises a display screen, wherein the display screen is connected with the control unit 1, is a touch display screen and is connected with the control unit 1 through a signal data line. Through the display screen, parameters such as external input power, pressure in the electrolytic tank 6, valve opening of a pressure regulating valve, hydrogen and oxygen gas production rate and the like can be visualized, and the operating condition of the electrolytic tank 6 can be monitored by workers conveniently.
In order to keep the air pressure of the electrolytic tank stable under different working conditions, and improve the control precision of the air pressure while stabilizing the air pressure of the electrolytic tank, so as to further improve the safety and efficiency of hydrogen production, the application provides a high-precision active pressure control method based on the high-precision pressure control system described above, and specifically, as shown in fig. 1, the high-precision active pressure control method comprises the following steps:
s1, acquiring external input power of an electrolytic tank and real-time pressure inside the electrolytic tank under a fluctuation working condition;
s2, determining a power range of external input power, determining a pressure set value according to the power range of the external input power, and stabilizing the pressure in the electrolytic tank to the pressure set value;
and S3, if the external input power is increased, determining a current variation according to the power variation value, determining a gas variation according to the current variation, determining the opening degree of the pressure regulating valve to be changed according to the gas variation, gradually increasing the opening degree of the pressure regulating valve, and if the external input power is reduced, determining the current variation according to the power variation, determining the gas variation according to the current variation, determining the opening degree of the pressure regulating valve to be changed according to the gas variation, and gradually decreasing the opening degree of the pressure regulating valve.
Because the external input power may change at any time under the fluctuation working condition, in the execution process of the method, the external input power and the real-time pressure of the electrolytic tank are monitored in real time, and once the external input power changes and is not in the originally determined power range, the step S2 is immediately re-executed to realize the real-time pressure control.
In step S2, a plurality of power ranges are preset, and a corresponding pressure setting value is preset for each power range. When the electrolytic tank works in a high-power interval, setting larger pressure in the electrolytic tank, at the moment, the gas flow is larger, starting a large-flow regulating valve with a large flow range, firstly increasing the pressure of the electrolytic tank to a set value, and stabilizing the pressure in the electrolytic tank near the set value through a control unit; when the electrolytic tank works in a low power interval, the pressure in the electrolytic tank is set to be smaller, the gas flow is smaller at the moment, a small flow regulating valve with a small flow range is started, the pressure in the electrolytic tank is firstly reduced to a set value, and the pressure in the electrolytic tank is stabilized near the set value through a control unit.
As a preferred embodiment, 3 power ranges are set in this embodiment, and the pressure setting values corresponding to the respective power ranges are determined respectively, as follows:
the rated input power of the electrolytic tank is X0, the working range is 0.3X0-1.2X0, the rated working pressure of the electrolytic tank under the rated power X0 is P0, the external input power X1 is obtained, if 0.3X0 is less than or equal to X1 and less than or equal to 0.5X0, the pressure set value P1= 0.5P0, if 0.5X0< X1 is less than or equal to 0.8X0, the pressure set value P1= 0.75P0, and if 0.8X0< X1 is less than or equal to 1.2X0, the pressure set value P1=P0.
Further, the pressure in the electrolytic tank is stabilized at about a pressure set value through the pressure regulating valve, and specifically, when 0.3X0 is more than or equal to X1 and less than or equal to 0.5X0, namely the electrolytic tank works in a low-power interval, the current is smaller, the generated gas change is also smaller, the pressure is regulated by using the small-flow regulating valve, the pressure range can be better controlled when the low-precision small-flow regulating valve works under a low-power working condition, the pressure control precision is improved, and the stability of the electrolytic tank under the low-input power working condition is improved; when 0.5X0< X1 is less than or equal to 0.8X0, using a large-flow regulating valve to regulate the pressure; when 0.8X0< X1 is less than or equal to 1.2X0, the large-flow regulating valve and the small-flow regulating valve work simultaneously to regulate pressure. In addition, when the electrolytic tank is in a stable working condition, the external input power can not be suddenly changed, so that the large-flow regulating valve and the small-flow regulating valve can work simultaneously, the low-precision large-flow regulating valve is used for stabilizing the pressure, and the high-precision small-flow regulating valve is used for accurately controlling the pressure range.
In step S3, if the input power suddenly increases, the control unit calculates the valve opening which is approximately required to be changed according to the power change, and the valve opening is relatively advanced and gradually increased, so that the pressure stability of the electrolytic tank is maintained; if the input power suddenly decreases, the control unit calculates the valve opening which needs to be changed approximately according to the power change, and relatively advances and gradually reduces the valve opening to maintain the stability of the pressure of the electrolytic tank, in this step, the external input power is still in the power range determined in the step S2, the variation is small, the accurate pressure control can be performed by means of the small flow regulating valve, and if the external input power suddenly changes not in the power range determined in the step S2, the step S2 needs to be re-executed. The gas variation includes hydrogen variation and oxygen variation, and the hydrogen variation ΔH 2 And oxygen variationQuantity DeltaO 2 The following relationship is satisfied with the current variation Δi:
ΔO 2 ＝ΔI/(4F)
wherein DeltaH 2 And DeltaO 2 In mol/s, F is the Faraday coefficient and the value is 96500C/mol.
After the variation of the hydrogen and the oxygen is determined, the opening of the pressure regulating valve can be determined by combining the current pressure and the working parameters of the pressure regulating valve.
It will be appreciated that electrolytic hydrogen production does not occur instantaneously, and that there is a time difference between the change in external input power and the change in gas yield, and that in step S3 of the present application, the pressure regulating valve is adjusted immediately after the external input power is increased or decreased, in fact, the valve is controlled in advance before the amount of gas reaches the amount of change. After the external input power is increased, calculating the valve opening required for stabilizing the internal pressure of the current electrolytic tank according to the calculated generated hydrogen and oxygen variation, and relatively advancing and gradually increasing the valve opening of the pressure regulating valve to maintain the stability of the pressure of the electrolytic tank; after the external input power is reduced, calculating the valve opening required for stabilizing the internal pressure of the current electrolytic tank according to the calculated generated hydrogen and oxygen variation, and gradually reducing the valve opening of the pressure regulating valve in advance to maintain the stability of the pressure of the electrolytic tank.
The external input power can change under the fluctuation working condition to cause pressure fluctuation, so that the pressure set value is determined according to the power interval where the external input power is located, the pressure in the electrolytic tank is initially stabilized, the pressure of the electrolytic tank is adjusted in real time according to the increase or decrease of the external input power, the electrolytic tank can be maintained to work in the optimal pressure interval, the dynamic working condition is adapted, the efficiency of the electrolytic tank is improved, the hydrogen and oxygen mixing caused by unbalanced pressure in the electrolytic tank is avoided, and the stability and the safety of the electrolytic tank are improved.
The application adopts real-time feedback control on pressure control, monitors external input power and internal pressure of the electrolytic tank in real time, sets the most suitable working pressure of the alkaline water electrolytic tank according to the external input power, starts the pressure regulating valve according to the set alkaline water electrolytic tank pressure, firstly stabilizes the pressure of the alkaline water electrolytic tank in the range of ideal working conditions, and then regulates the high-precision small-flow regulating valve to control the pressure of the alkaline water electrolytic tank with high precision.
The foregoing describes in detail preferred embodiments of the present application. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the application by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (8)
1. The high-precision active pressure control method for the alkaline water electrolysis tank is characterized by being realized based on a high-precision pressure control system, wherein the high-precision pressure control system comprises a control unit, a pressure sensor and a pressure regulating valve, the control unit is connected with the pressure sensor and the pressure regulating valve, the pressure sensor is provided with two groups which are respectively connected with a hydrogen side outlet and an oxygen side outlet of the electrolysis tank and used for measuring pressure data in the electrolysis tank; the pressure regulating valves are provided with two groups, are respectively arranged at a hydrogen side outlet and an oxygen side outlet of the electrolytic tank and are used for regulating the pressure in the electrolytic tank, each group of pressure regulating valves comprises a large-flow regulating valve and a small-flow regulating valve, and the large-flow regulating valves are connected in parallel with the small-flow regulating valves;
specifically, the high-precision active pressure control method comprises the following steps:
s1, acquiring external input power of an electrolytic tank and real-time pressure inside the electrolytic tank under a fluctuation working condition;
s2, determining a power range of external input power, determining a pressure set value according to the power range of the external input power, and stabilizing the pressure in the electrolytic tank to the pressure set value; specifically, a plurality of power ranges are preset, and a corresponding pressure set value is preset for each power range;
s3, if the external input power is increased, determining a current variation according to the power variation value, determining a gas variation based on the current variation, determining the opening of the pressure regulating valve to be changed based on the gas variation, gradually increasing the opening of the pressure regulating valve, and if the external input power is reduced, determining the current variation according to the power variation, determining the gas variation based on the current variation, determining the opening of the pressure regulating valve to be changed based on the gas variation, and gradually decreasing the opening of the pressure regulating valve;
the rated input power of the electrolytic tank is X0, the working range is 0.3X0-1.2X0, the rated working pressure of the electrolytic tank under the rated power X0 is P0, the external input power X1 is obtained, if 0.3X0 is less than or equal to X1 and less than or equal to 0.5X0, the pressure set value P1= 0.5P0, if 0.5X0< X1 is less than or equal to 0.8X0, the pressure set value P1= 0.75P0, and if 0.8X0< X1 is less than or equal to 1.2X0, the pressure set value P1=P0.
2. The method for high-precision active pressure control of an alkaline water electrolyzer according to claim 1, characterized in that the external input power X1 is obtained, and when 0.3X0 is less than or equal to X1 is less than or equal to 0.5X0, a small flow rate regulating valve is used for pressure regulation; when 0.5X0< X1 is less than or equal to 0.8X0, using a large-flow regulating valve to regulate the pressure; when 0.8X0< X1 is less than or equal to 1.2X0, the large-flow regulating valve and the small-flow regulating valve work simultaneously to regulate pressure.
3. The method according to claim 1, wherein in step S3, the gas variation includes a hydrogen variation and an oxygen variation, and the hydrogen variation Δh is a hydrogen variation 2 And oxygen variation Δo 2 The following relationship is satisfied with the current variation Δi:
ΔO 2 ＝ΔI/(4F)
wherein DeltaH 2 And DeltaO 2 In mol/s, F is the Faraday coefficient and the value is 96500C/mol.
4. The high-precision active pressure control method for an alkaline water electrolysis cell according to claim 1, wherein the high-precision pressure control system further comprises pressure maintaining valves, wherein the pressure maintaining valves are provided with two groups, namely a hydrogen side outlet and an oxygen side outlet, which are respectively arranged in the electrolysis cell and are used for maintaining the pressure in the electrolysis cell.
5. The method for high-precision active pressure control of an alkaline water electrolyzer of claim 1 wherein the high and low flow regulating valves are electromagnetic regulating valves.
6. The method for high-precision active pressure control of an alkaline water electrolyzer of claim 1 wherein the control unit is connected to a pressure sensor and a pressure regulating valve via signal data lines.
7. The method of high-precision active pressure control for an alkaline water electrolyzer of claim 1 wherein the high-precision pressure control system further comprises an alarm connected to the control unit for emitting an alarm signal.
8. The high-precision active pressure control method for an alkaline water electrolysis cell according to claim 1, wherein the control unit comprises a data acquisition module, an operation module and an execution module; the data acquisition module is connected with an external input power supply and a pressure sensor of the electrolytic cell and is used for acquiring the external input power of the electrolytic cell and the real-time pressure inside the electrolytic cell; the operation module is connected with the data acquisition module and the execution module and is used for calculating the opening of the pressure regulating valve according to the external input power and the real-time pressure; the execution module is connected with the pressure regulating valve and is used for controlling the opening degree of the pressure regulating valve according to the output of the operation module.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210589386.9A CN115011999B (en) | 2022-05-26 | 2022-05-26 | High-precision active pressure control method for alkaline water electrolysis tank |
| PCT/CN2022/126238 WO2023226285A1 (en) | 2022-05-26 | 2022-10-19 | High-precision active pressure control method for alkaline water electrolyzer |
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| CN115011999B (en) * | 2022-05-26 | 2023-08-29 | 同济大学 | High-precision active pressure control method for alkaline water electrolysis tank |
| CN117472122A (en) * | 2023-10-08 | 2024-01-30 | 三峡科技有限责任公司 | MW alkaline water electrolysis system operation control optimization method |
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| CN207525022U (en) * | 2017-11-16 | 2018-06-22 | 明达实业(厦门)有限公司 | Electrolytic cell with flow regulating function |
| CN113373477A (en) * | 2021-06-17 | 2021-09-10 | 中国华能集团清洁能源技术研究院有限公司 | Method and system for controlling electrolyte flow and pressure of dynamic hydrogen production electrolytic cell |
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| DE10220850A1 (en) * | 2002-05-08 | 2003-11-27 | Forschungszentrum Juelich Gmbh | Control device for an alkaline pressure electrolyzer |
| JP7110042B2 (en) * | 2018-09-13 | 2022-08-01 | 東芝エネルギーシステムズ株式会社 | Hydrogen production device and hydrogen production method |
| CN111850591B (en) * | 2020-03-31 | 2023-06-06 | 同济大学 | Combined diaphragm regulating valve device, alkaline water electrolysis hydrogen production system and control method |
| CN113430536B (en) * | 2021-07-16 | 2022-04-08 | 阳光电源股份有限公司 | Water electrolysis hydrogen production system |
| CN113529105B (en) * | 2021-07-29 | 2023-01-24 | 全球能源互联网研究院有限公司 | Hydrogen production system, and pressure regulation and control method and device for hydrogen production system |
| CN113604840A (en) * | 2021-08-16 | 2021-11-05 | 阳光电源股份有限公司 | Pressure control method of hydrogen production system and hydrogen production system |
| CN114134527B (en) * | 2021-12-15 | 2024-03-12 | 考克利尔竞立(苏州)氢能科技有限公司 | Water electrolysis hydrogen production device and method with multiple electrolytic tanks |
| CN114381755B (en) * | 2022-02-10 | 2023-07-21 | 阳光氢能科技有限公司 | Standby control method, control system and hydrogen production device |
| CN115011999B (en) * | 2022-05-26 | 2023-08-29 | 同济大学 | High-precision active pressure control method for alkaline water electrolysis tank |
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| CN207525022U (en) * | 2017-11-16 | 2018-06-22 | 明达实业(厦门)有限公司 | Electrolytic cell with flow regulating function |
| CN113373477A (en) * | 2021-06-17 | 2021-09-10 | 中国华能集团清洁能源技术研究院有限公司 | Method and system for controlling electrolyte flow and pressure of dynamic hydrogen production electrolytic cell |
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