CN116356370A - Liquid level control method and electrolytic water hydrogen production system - Google Patents
Liquid level control method and electrolytic water hydrogen production system Download PDFInfo
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- CN116356370A CN116356370A CN202310343687.8A CN202310343687A CN116356370A CN 116356370 A CN116356370 A CN 116356370A CN 202310343687 A CN202310343687 A CN 202310343687A CN 116356370 A CN116356370 A CN 116356370A
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 272
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 272
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 256
- 239000007788 liquid Substances 0.000 title claims abstract description 205
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 50
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 170
- 239000001301 oxygen Substances 0.000 claims abstract description 170
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 170
- 239000007789 gas Substances 0.000 claims abstract description 49
- 238000005868 electrolysis reaction Methods 0.000 claims description 71
- 230000001105 regulatory effect Effects 0.000 claims description 37
- 230000001276 controlling effect Effects 0.000 claims description 27
- 150000002431 hydrogen Chemical class 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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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
- C25B15/02—Process control or regulation
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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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
- C25B15/02—Process control or regulation
- C25B15/023—Measuring, analysing or testing during electrolytic production
- C25B15/025—Measuring, analysing or testing during electrolytic production of electrolyte parameters
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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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- Organic Chemistry (AREA)
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- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention discloses a liquid level control method and an electrolytic water hydrogen production system, which can cut off an input power supply of an electrolytic cell and control a hydrogen side air outlet switch valve and an oxygen side air outlet switch valve of the electrolytic water hydrogen production equipment to be closed when the hydrogen side liquid level and the oxygen side liquid level of the electrolytic water hydrogen production equipment reach the stop condition. The invention can monitor the hydrogen side liquid level and the oxygen side liquid level, and directly close the hydrogen side air outlet switch valve and the oxygen side air outlet switch valve when the shutdown condition is reached, so as to stop exhausting gas outwards. And simultaneously, directly disconnecting the power supply of the electrolytic cell to stop generating hydrogen and oxygen. Therefore, the electrolytic water hydrogen production equipment does not discharge gas outwards and generate gas inside, so that the liquid level difference between the hydrogen side liquid level and the oxygen side liquid level in the electrolytic water hydrogen production equipment is kept unchanged, the safety accident caused by the expansion of the liquid level difference progress between the hydrogen side liquid level and the oxygen side liquid level is avoided, and the control of liquid level balance is timely and accurate.
Description
Technical Field
The invention relates to the field of chemical industry, in particular to a liquid level control method and a water electrolysis hydrogen production system.
Background
In the water electrolysis hydrogen production system, maintaining the liquid level balance at the two sides (a hydrogen separator and an oxygen separator) of the water electrolysis hydrogen production equipment is important to the safety of the hydrogen production system, and when the liquid level deviation at the two sides is large, the gas at the hydrogen side can be led to the oxygen side or the gas at the oxygen side can be led to the hydrogen side, so that safety accidents such as fire and even explosion are caused.
Therefore, when the liquid levels at two sides have an unbalanced trend, how to accurately control the liquid levels at two sides in time to maintain balance becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above problems, the invention provides a liquid level control method and an electrolytic water hydrogen production system, so as to solve the problem of timely and accurately controlling the liquid levels at two sides of electrolytic water hydrogen production equipment to keep balance.
In a first aspect, a liquid level control method includes:
when the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production equipment reach the shutdown condition, the input power supply of the electrolytic cell is cut off, and the hydrogen side air outlet switch valve and the oxygen side air outlet switch valve of the water electrolysis hydrogen production equipment are controlled to be closed, wherein the gas generated by the electrolytic cell flows to the hydrogen side and the oxygen side of the water electrolysis hydrogen production equipment.
With reference to the first aspect, in certain optional embodiments, before the step of switching off the input power to the electrolytic cell and controlling the hydrogen side outlet gas switching valve and the oxygen side outlet gas switching valve of the electrolytic water hydrogen production plant to close when the hydrogen side liquid level and the oxygen side liquid level of the electrolytic water hydrogen production plant reach the shutdown condition, the method further includes:
acquiring a hydrogen side liquid level of the electrolytic water hydrogen production equipment;
and collecting and obtaining the oxygen side liquid level of the electrolytic water hydrogen production equipment.
Optionally, in certain optional embodiments, the collecting obtains a hydrogen side liquid level of the water electrolysis hydrogen plant, comprising:
and acquiring the hydrogen side liquid level of the water electrolysis hydrogen production equipment through a liquid level acquisition device of a hydrogen separator of the water electrolysis hydrogen production equipment.
Optionally, in certain optional embodiments, the acquiring obtains an oxygen side liquid level of the water electrolysis hydrogen plant, comprising:
and acquiring and obtaining the oxygen side liquid level of the water electrolysis hydrogen production equipment through a liquid level acquisition device of an oxygen separator of the water electrolysis hydrogen production equipment.
Optionally, in certain optional embodiments, after acquiring the hydrogen side liquid level and the oxygen side liquid level, the method further comprises:
calculating a liquid level difference between the hydrogen side liquid level and the oxygen side liquid level;
if the liquid level difference does not reach the shutdown condition, the liquid level difference is used as a feedback value to be input into a first PID algorithm, so that a first control quantity output by the first PID algorithm is obtained;
and controlling the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production equipment to keep balance according to the first control quantity.
Optionally, in certain optional embodiments, said controlling the hydrogen side level and the oxygen side level of the electrolyzed water forming apparatus to be balanced according to the first control amount comprises:
and controlling the opening of a hydrogen side air outlet regulating valve of the water electrolysis hydrogen production equipment according to the first control quantity so as to control the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production equipment to keep balance.
Optionally, in some optional embodiments, an instruction value of the first PID algorithm is preset to zero.
Optionally, in some optional embodiments, the shutdown condition is that the liquid level gap is not less than a preset gap threshold.
Optionally, in some optional embodiments, the liquid level difference is equal to the hydrogen side liquid level minus the oxygen side liquid level.
Optionally, in some optional embodiments, before the input power to the electrolytic cell is cut off and the hydrogen side outlet gas switching valve and the oxygen side outlet gas switching valve of the electrolytic water hydrogen production device are controlled to be closed when the hydrogen side liquid level and the oxygen side liquid level of the electrolytic water hydrogen production device reach the shutdown condition, the method further includes:
acquiring a pressure value of an oxygen separator of the water electrolysis hydrogen production equipment through a pressure sensor of the oxygen separator of the water electrolysis hydrogen production equipment;
inputting the pressure value as a feedback value to a second PID algorithm, so as to obtain a second control quantity output by the second PID algorithm;
and controlling the working pressure of the water electrolysis hydrogen production equipment to be stable according to the second control quantity.
Optionally, in some optional embodiments, the controlling the working pressure of the water electrolysis hydrogen production plant to be stable according to the second control amount includes:
and controlling the opening degree of an oxygen side air outlet regulating valve of the water electrolysis hydrogen production equipment according to the second control amount so as to control the working pressure of the water electrolysis hydrogen production equipment to be stable.
In a second aspect, a system for producing hydrogen from electrolyzed water includes the hydrogen side, an oxygen side, and a controller;
the hydrogen side and the oxygen side are both in communication connection with the controller;
the hydrogen side is used for absorbing and discharging hydrogen;
the oxygen side is used for absorbing and exhausting oxygen;
the controller is used for the liquid level control method of any one of the above.
With reference to the second aspect, in certain alternative embodiments, the hydrogen side includes: a hydrogen side air outlet switch valve, a hydrogen side air outlet regulating valve and a hydrogen separator;
the hydrogen separator is used for separating substances generated by the electrolytic cell to obtain hydrogen and conveying the hydrogen to the hydrogen side air outlet regulating valve through a pipeline;
the hydrogen side outlet gas regulating valve is used for regulating the flow of hydrogen and conveying the hydrogen to the hydrogen side outlet gas switching valve through a pipeline;
the hydrogen side air outlet switch valve is used for controlling the hydrogen to be discharged to the outside.
Optionally, in certain optional embodiments, the oxygen side includes: an oxygen side air outlet switch valve, an oxygen side air outlet regulating valve and an oxygen separator;
the oxygen separator is used for separating substances generated by the electrolytic cell to obtain oxygen and conveying the oxygen to the oxygen side air outlet regulating valve through a pipeline;
the oxygen side air outlet regulating valve is used for regulating the flow of oxygen and conveying the oxygen to the oxygen side air outlet switching valve through a pipeline;
the oxygen side air outlet switch valve is used for controlling the oxygen to be discharged to the outside.
Optionally, in certain optional embodiments, the liquid level control system further comprises: a power switch of the electrolytic cell;
the power switch is used for cutting off the input power supply of the electrolytic cell.
By means of the technical scheme, the liquid level control method and the electrolytic water hydrogen production system provided by the invention can cut off the input power supply of the electrolytic cell and control the hydrogen side air outlet switch valve and the oxygen side air outlet switch valve of the electrolytic water hydrogen production equipment to be closed when the hydrogen side liquid level and the oxygen side liquid level of the electrolytic water hydrogen production equipment reach the stop condition, wherein gas generated by the electrolytic cell flows to the hydrogen side and the oxygen side of the electrolytic water hydrogen production equipment. Therefore, the invention can monitor the hydrogen side liquid level and the oxygen side liquid level, and directly close the hydrogen side air outlet switch valve and the oxygen side air outlet switch valve when the hydrogen side liquid level and the oxygen side liquid level reach the shutdown condition so as to stop discharging the gas outwards. And simultaneously, directly disconnecting the power supply of the electrolytic cell to stop generating hydrogen and oxygen. Therefore, the electrolytic water hydrogen production equipment does not discharge gas outwards and generate gas inside, so that the liquid level difference between the hydrogen side liquid level and the oxygen side liquid level in the electrolytic water hydrogen production equipment is kept unchanged, the safety accident caused by the expansion of the liquid level difference progress between the hydrogen side liquid level and the oxygen side liquid level is avoided, and the control of liquid level balance is timely and accurate.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 shows a flow chart of a first liquid level control method provided by the invention;
FIGS. 2-4 illustrate flow charts of another three liquid level control methods provided by the present invention;
FIGS. 5-6 illustrate flow charts of another two liquid level control methods provided by the present invention;
FIG. 7 shows a schematic representation of the tuning of the first PID algorithm provided by the invention;
FIGS. 8-9 illustrate flow charts of yet another two liquid level control methods provided by the present invention;
FIG. 10 shows a schematic of the tuning of a second PID algorithm provided by the invention;
FIG. 11 shows a schematic structural diagram of a water electrolysis hydrogen production system provided by the invention;
FIGS. 12-13 are schematic diagrams showing the structure of another two hydrogen production systems by electrolysis of water according to the present invention;
FIG. 14 shows a schematic structural diagram of another electrolytic water hydrogen production system provided by the present invention;
fig. 15 shows a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, the present invention provides a liquid level control method, including: s100, performing S100;
s100, when the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production equipment reach the shutdown condition, cutting off an input power supply of an electrolytic cell, and controlling a hydrogen side air outlet switch valve and an oxygen side air outlet switch valve of the water electrolysis hydrogen production equipment to be closed, wherein gas generated by the electrolytic cell flows to the hydrogen side and the oxygen side of the water electrolysis hydrogen production equipment.
Alternatively, the water electrolysis hydrogen production equipment is a generic term and can comprise a hydrogen side, an oxygen side and corresponding controllers, and the hydrogen side and the oxygen side can respectively comprise a plurality of equipment.
Alternatively, the subject of the present invention may be a controller of a water electrolysis hydrogen plant. That is, when the controller determines that the hydrogen side liquid level and the oxygen side liquid level reach the shutdown condition, a corresponding control instruction can be sent out to cut off the input power supply of the electrolytic cell, and the hydrogen side gas outlet switch valve and the oxygen side gas outlet switch valve are closed, so that the liquid level difference between the hydrogen side liquid level and the oxygen side liquid level is maintained unchanged, and the occurrence of safety accidents caused by expansion of the liquid level difference is avoided.
Alternatively, the liquid level on the hydrogen side of the present invention may be the liquid level of the hydrogen separator on the hydrogen side, and the liquid level on the oxygen side may be the liquid level of the oxygen separator on the oxygen side. The hydrogen side liquid level and the oxygen side liquid level can be the current liquid level which is collected in real time at the same time, and the collection frequency can be set according to actual needs, so the invention is not limited to the current liquid level.
Therefore, before S100, the present invention needs to acquire the hydrogen side liquid level and the oxygen side liquid level at the same time so as to determine whether the hydrogen side liquid level and the oxygen side liquid level reach the stop condition.
That is, as shown in fig. 2, in combination with the embodiment shown in fig. 1, in certain alternative embodiments, prior to S100, the method further comprises: s80 and S90;
s80, acquiring and obtaining the hydrogen side liquid level of the water electrolysis hydrogen production equipment;
s90, acquiring and obtaining the oxygen side liquid level of the water electrolysis hydrogen production equipment.
Optionally, in the process of collecting the hydrogen side liquid level and the oxygen side liquid level, the controller can actively send instructions to the corresponding collectors for collection, or the corresponding collectors can periodically collect and then actively upload collected information to an execution main body of the invention.
Optionally, no necessary sequence of execution exists between S80 and S90, S80 may be executed first, S90 may be executed first, and S80 and S90 may be executed in parallel.
For example, as shown in fig. 3, in combination with the embodiment shown in fig. 2, in some alternative embodiments, the S80 includes: s81;
s81, acquiring the hydrogen side liquid level of the water electrolysis hydrogen production equipment through a liquid level acquisition device of a hydrogen separator of the water electrolysis hydrogen production equipment.
Optionally, the liquid level collector of the invention can be integrated on a hydrogen separator or can be an independent collector. The invention does not limit the model and the size of the liquid level collector, and any collector capable of collecting the liquid level of the hydrogen separator belongs to the protection scope of the invention.
Optionally, the liquid level collector can directly collect the value of the liquid level on the hydrogen side, or collect a signal corresponding to the liquid level on the hydrogen side, and treat the signal to a certain extent to obtain the value of the liquid level on the hydrogen side.
As another example, as shown in fig. 4, in combination with the embodiment shown in fig. 2, in some alternative embodiments, the S90 includes: s91, performing S91;
s91, acquiring the oxygen side liquid level of the water electrolysis hydrogen production equipment through a liquid level acquisition device of an oxygen separator of the water electrolysis hydrogen production equipment.
Alternatively, for the explanation of S91, the explanation of S81 may be equally understood, which will not be repeated in the present invention.
It should be noted that: the invention is based on the scene that hydrogen is prepared by electrolyzing alkaline water, the hydrogen and alkali liquor generated by electrolysis can jointly enter a hydrogen separator, and the generated oxygen and alkali liquor can jointly enter the oxygen separator.
As shown in fig. 5, in combination with the embodiments shown in any one of fig. 2-4, in certain alternative embodiments, after acquiring the hydrogen side liquid level and the oxygen side liquid level, the method further comprises: s92, S200, and S300;
s92, calculating a liquid level difference between the hydrogen side liquid level and the oxygen side liquid level;
alternatively, the present invention is not limited to a specific process of calculating the liquid level difference. For example, the present invention may calculate the difference between the hydrogen side liquid level and the oxygen side liquid level, and may calculate the difference between the oxygen side liquid level and the hydrogen side liquid level. Of course, the invention can also calculate the ratio of the hydrogen side liquid level and the oxygen side liquid level, and the liquid level difference is reflected by the ratio, so the invention is not limited to this.
S200, if the liquid level difference does not reach the shutdown condition, the liquid level difference is used as a feedback value to be input into a first PID algorithm, so that a first control quantity output by the first PID algorithm is obtained;
alternatively, the shutdown condition of the present invention may be that the liquid level gap reaches a certain gap threshold. For example, in some alternative embodiments, the shut-down condition is that the liquid level difference is not less than a preset difference threshold, taking as an example the difference in liquid level equal to the hydrogen side liquid level minus the oxygen side liquid level, in conjunction with the embodiment shown in fig. 5. If the absolute value of the difference of the hydrogen side liquid level minus the oxygen side liquid level is smaller than a preset difference threshold, the liquid level difference does not reach the shutdown condition; if the absolute value of the difference of the hydrogen side liquid level minus the oxygen side liquid level is not smaller than the preset difference threshold value, the liquid level difference reaches the stop condition.
Alternatively, if the liquid level difference does not reach the shutdown condition, the condition that the shutdown is not reached is indicated, and the electrolysis can be continued to generate hydrogen and oxygen. However, in order to avoid the sudden increase of the liquid level gap in the electrolysis process, the electrolysis process can be regulated by adopting a corresponding PID (in industrial process control, the proportional, integral and differential control method according to errors generated by comparing the real-time data acquisition information of the controlled object with a given value, proportional Integral Derivative) algorithm.
Optionally, in combination with the embodiment shown in fig. 5, in some optional embodiments, the instruction value of the first PID algorithm is preset to zero.
Alternatively, S100 and S200 are two cases, where the collected hydrogen side liquid level and the oxygen side liquid level either reach a shutdown condition or do not reach a shutdown condition, which is not limited by the present invention.
And S300, controlling the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production equipment to keep balance according to the first control quantity.
Alternatively, the present invention is not particularly limited as to the manner in which the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production apparatus are controlled to be balanced according to the first control amount.
For example, as shown in fig. 6, in combination with the embodiment shown in fig. 5, in some alternative embodiments, the S300 includes: s310;
and S310, controlling the opening degree of a hydrogen side air outlet regulating valve of the water electrolysis hydrogen production equipment according to the first control quantity so as to control the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production equipment to keep balance.
Optionally, the first control amount may directly represent the opening of the hydrogen side outlet gas regulating valve, and after the first control amount is obtained, the opening of the hydrogen side outlet gas regulating valve is directly controlled to be the first control amount.
Alternatively, the PID algorithm (including the first PID algorithm and the second PID algorithm) of the present invention may be executed by a PID regulator integrated in the controller to perform the corresponding PID adjustment. The final execution unit of the first PID algorithm is a hydrogen side outlet gas regulating valve. That is, the first PID regulator outputs a first control amount based on the command value and the liquid level difference, and acts on the hydrogen-side outlet gas regulating valve to control the opening degree of the hydrogen-side outlet gas regulating valve.
Alternatively, the adjustment schematic of the first PID algorithm is shown in FIG. 7, wherein ΔL0 is the difference between the command value and the level difference, D T1 Is the first control amount.
As shown in fig. 8, in combination with the embodiments shown in fig. 1-4, in certain alternative embodiments, prior to S100, the method further comprises: s50, S60 and S70;
s50, acquiring and obtaining a pressure value of an oxygen separator of the water electrolysis hydrogen production equipment through a pressure sensor of the oxygen separator of the water electrolysis hydrogen production equipment;
alternatively, the pressure value of the oxygen separator refers to the pressure value of the stored oxygen in the oxygen separator.
Alternatively, the embodiment of fig. 8 may be understood as that, on the premise that the hydrogen side liquid level and the oxygen side liquid level do not reach the shutdown condition, the pressure value of the oxygen separator may be collected during the operation of the whole water electrolysis hydrogen production device, so that the working pressure of the water electrolysis hydrogen production device is controlled to be stable according to the pressure value, which is not limited in the present invention.
S60, taking the pressure value as a feedback value and inputting the feedback value into a second PID algorithm, so as to obtain a second control quantity output by the second PID algorithm;
and S70, controlling the working pressure of the water electrolysis hydrogen production equipment to be stable according to the second control quantity.
Alternatively, as previously described, the second PID algorithm can be executed by a PID regulator integrated in the controller to make the corresponding PID adjustments. That is, the second PID regulator outputs the second control amount based on the command value (preset operating pressure value) and the pressure value.
As shown in fig. 9, in combination with the embodiment shown in fig. 8, in some alternative embodiments, the S70 includes: s71;
and S71, controlling the opening degree of an oxygen side air outlet regulating valve of the water electrolysis hydrogen production equipment according to the second control quantity so as to control the working pressure of the water electrolysis hydrogen production equipment to be stable.
Optionally, the second control amount acts on the oxygen-side outlet gas regulating valve to control the opening degree of the oxygen-side outlet gas regulating valve. The second PID algorithm is schematically regulated as shown in FIG. 10, wherein ΔP0 is the difference between the preset operating pressure value and the currently detected pressure value, D T2 Is the second control amount.
Therefore, the invention can monitor the hydrogen side liquid level and the oxygen side liquid level, and directly close the hydrogen side air outlet switch valve and the oxygen side air outlet switch valve when the hydrogen side liquid level and the oxygen side liquid level reach the shutdown condition so as to stop discharging the gas outwards. And simultaneously, directly disconnecting the power supply of the electrolytic cell to stop generating hydrogen and oxygen. Therefore, the electrolytic water hydrogen production equipment does not discharge gas outwards and generate gas inside, so that the liquid level difference between the hydrogen side liquid level and the oxygen side liquid level in the electrolytic water hydrogen production equipment is kept unchanged, the safety accident caused by the expansion of the liquid level difference progress between the hydrogen side liquid level and the oxygen side liquid level is avoided, and the control of liquid level balance is timely and accurate.
As shown in fig. 11, the present invention provides a water electrolysis hydrogen production system comprising the hydrogen side 100, the oxygen side 200, and a controller 300;
the hydrogen side 100 and the oxygen side 200 are both communicatively coupled to the controller 300;
the hydrogen side 100 for absorbing and discharging hydrogen;
the oxygen side 200 for absorbing and exhausting oxygen;
the controller 300 is configured to perform any one of the above-described liquid level control methods.
As shown in fig. 12, in combination with the embodiment shown in fig. 11, in certain alternative embodiments, the hydrogen side 100 includes: a hydrogen side outlet gas switching valve 110, a hydrogen side outlet gas regulating valve 120, and a hydrogen separator 130;
the hydrogen separator 130 is used for separating substances generated by the electrolytic cell to obtain hydrogen and delivering the hydrogen to the hydrogen side air outlet regulating valve 120 through a pipeline;
the hydrogen side outlet gas regulating valve 120 is configured to regulate a flow rate of hydrogen, and convey the hydrogen to the hydrogen side outlet gas switching valve 110 through a pipeline;
the hydrogen side outlet valve 110 is used for controlling the hydrogen to be discharged to the outside.
Alternatively, the hydrogen separator 130 may be a gas-liquid separator for separating hydrogen from lye, and the hydrogen may be piped to the hydrogen side outlet regulator 120, where the lye is returned to the cell.
As shown in fig. 13, in combination with the embodiment shown in any of fig. 11-12, in certain alternative embodiments, the oxygen side 200 includes: an oxygen side outlet gas switching valve 210, an oxygen side outlet gas regulating valve 220, and an oxygen separator 230;
the oxygen separator 230 is used for separating substances generated by the electrolytic cell to obtain oxygen and delivering the oxygen to the oxygen side air outlet regulating valve 220 through a pipeline;
the oxygen side outlet gas regulating valve 220 is configured to regulate the flow of oxygen and convey the oxygen to the oxygen side outlet gas switching valve 210 through a pipeline;
the oxygen side outlet valve 210 is used for controlling the oxygen to be discharged to the outside.
Alternatively, the oxygen separator 230 may be a gas-liquid separator for separating oxygen from the lye, and the oxygen may be piped to the oxygen side outlet regulator 220, where the lye is returned to the cell.
As shown in fig. 14, in combination with the embodiment shown in fig. 13, in certain alternative embodiments, the fluid level control system further comprises: a power switch 400 of the electrolytic cell;
the power switch 400 is used for cutting off the input power of the electrolytic cell.
The present invention provides a computer-readable storage medium having stored thereon a program which, when executed by a processor, implements the liquid level control method of any one of the above.
In summary, the invention can monitor the hydrogen side liquid level and the oxygen side liquid level, and directly close the hydrogen side gas outlet switch valve and the oxygen side gas outlet switch valve when the hydrogen side liquid level and the oxygen side liquid level reach the shutdown condition so as to stop discharging gas outwards. And simultaneously, directly disconnecting the power supply of the electrolytic cell to stop generating hydrogen and oxygen. Therefore, the electrolytic water hydrogen production equipment does not discharge gas outwards and generate gas inside, so that the liquid level difference between the hydrogen side liquid level and the oxygen side liquid level in the electrolytic water hydrogen production equipment is kept unchanged, the safety accident caused by the expansion of the liquid level difference progress between the hydrogen side liquid level and the oxygen side liquid level is avoided, and the control of liquid level balance is timely and accurate.
As shown in fig. 15, the present invention provides an electronic device 70, the electronic device 70 comprising at least one processor 701, and at least one memory 702, bus 703 connected to the processor 701; wherein, the processor 701 and the memory 702 complete communication with each other through the bus 703; the processor 701 is configured to invoke program instructions in the memory 702 to perform the liquid level control method according to any of the above.
In the present invention, relational terms such as first and second, and the like may be 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.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
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.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (15)
1. A liquid level control method, comprising:
when the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production equipment reach the shutdown condition, the input power supply of the electrolytic cell is cut off, and the hydrogen side air outlet switch valve and the oxygen side air outlet switch valve of the water electrolysis hydrogen production equipment are controlled to be closed, wherein the gas generated by the electrolytic cell flows to the hydrogen side and the oxygen side of the water electrolysis hydrogen production equipment.
2. The method of claim 1, wherein before the switching off the input power to the electrolytic cell and controlling the hydrogen side outlet gas switching valve and the oxygen side outlet gas switching valve of the water electrolysis hydrogen plant to both close when the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen plant reach a shutdown condition, the method further comprises:
acquiring a hydrogen side liquid level of the electrolytic water hydrogen production equipment;
and collecting and obtaining the oxygen side liquid level of the electrolytic water hydrogen production equipment.
3. The method of claim 2, wherein the acquiring obtains a hydrogen side liquid level of the water electrolysis hydrogen plant, comprising:
and acquiring the hydrogen side liquid level of the water electrolysis hydrogen production equipment through a liquid level acquisition device of a hydrogen separator of the water electrolysis hydrogen production equipment.
4. The method of claim 2, wherein the acquiring obtains an oxygen side liquid level of the electrolyzed water hydrogen plant, comprising:
and acquiring and obtaining the oxygen side liquid level of the water electrolysis hydrogen production equipment through a liquid level acquisition device of an oxygen separator of the water electrolysis hydrogen production equipment.
5. The method according to any one of claims 2-4, wherein after acquiring the hydrogen side liquid level and the oxygen side liquid level, the method further comprises:
calculating a liquid level difference between the hydrogen side liquid level and the oxygen side liquid level;
if the liquid level difference does not reach the shutdown condition, the liquid level difference is used as a feedback value to be input into a first PID algorithm, so that a first control quantity output by the first PID algorithm is obtained;
and controlling the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production equipment to keep balance according to the first control quantity.
6. The method of claim 5, wherein controlling the hydrogen side level and the oxygen side level of the electrolyzed water forming hydrogen apparatus to be balanced based on the first control amount comprises:
and controlling the opening of a hydrogen side air outlet regulating valve of the water electrolysis hydrogen production equipment according to the first control quantity so as to control the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production equipment to keep balance.
7. The method of claim 5, wherein the instruction value of the first PID algorithm is preset to zero.
8. The method of claim 5, wherein the shutdown condition is the liquid level gap being not less than a preset gap threshold.
9. The method of claim 5, wherein the liquid level difference is equal to the hydrogen side liquid level minus the oxygen side liquid level.
10. The method of any of claims 1-4, wherein before the switching off the input power to the electrolytic cell and controlling the hydrogen side outlet gas switching valve and the oxygen side outlet gas switching valve of the electrolyzed water hydrogen plant to both close when the hydrogen side liquid level and the oxygen side liquid level of the electrolyzed water hydrogen plant reach a shutdown condition, the method further comprises:
acquiring a pressure value of an oxygen separator of the water electrolysis hydrogen production equipment through a pressure sensor of the oxygen separator of the water electrolysis hydrogen production equipment;
inputting the pressure value as a feedback value to a second PID algorithm, so as to obtain a second control quantity output by the second PID algorithm;
and controlling the working pressure of the water electrolysis hydrogen production equipment to be stable according to the second control quantity.
11. The method of claim 10, wherein said controlling the operating pressure of the water electrolysis hydrogen plant to remain stable based on the second control amount comprises:
and controlling the opening degree of an oxygen side air outlet regulating valve of the water electrolysis hydrogen production equipment according to the second control amount so as to control the working pressure of the water electrolysis hydrogen production equipment to be stable.
12. A system for producing hydrogen by electrolysis of water, comprising a hydrogen side, an oxygen side and a controller;
the hydrogen side and the oxygen side are both in communication connection with the controller;
the hydrogen side is used for absorbing and discharging hydrogen;
the oxygen side is used for absorbing and exhausting oxygen;
the controller for performing the liquid level control method according to any one of claims 1 to 11.
13. The electrolyzed water hydrogen system according to claim 12, wherein the hydrogen side comprises: a hydrogen side air outlet switch valve, a hydrogen side air outlet regulating valve and a hydrogen separator;
the hydrogen separator is used for separating substances generated by the electrolytic cell to obtain hydrogen and conveying the hydrogen to the hydrogen side air outlet regulating valve through a pipeline;
the hydrogen side outlet gas regulating valve is used for regulating the flow of hydrogen and conveying the hydrogen to the hydrogen side outlet gas switching valve through a pipeline;
the hydrogen side air outlet switch valve is used for controlling the hydrogen to be discharged to the outside.
14. The water electrolysis hydrogen production system of any one of claims 12-13, wherein said oxygen side comprises: an oxygen side air outlet switch valve, an oxygen side air outlet regulating valve and an oxygen separator;
the oxygen separator is used for separating substances generated by the electrolytic cell to obtain oxygen and conveying the oxygen to the oxygen side air outlet regulating valve through a pipeline;
the oxygen side air outlet regulating valve is used for regulating the flow of oxygen and conveying the oxygen to the oxygen side air outlet switching valve through a pipeline;
the oxygen side air outlet switch valve is used for controlling the oxygen to be discharged to the outside.
15. The electrolyzed water hydrogen system according to claim 14, wherein the liquid level control system further comprises: a power switch of the electrolytic cell;
the power switch is used for cutting off the input power supply of the electrolytic cell.
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| CN202310343687.8A CN116356370A (en) | 2023-03-31 | 2023-03-31 | Liquid level control method and electrolytic water hydrogen production system |
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| CN202310343687.8A CN116356370A (en) | 2023-03-31 | 2023-03-31 | Liquid level control method and electrolytic water hydrogen production system |
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