Liquid level control method and water electrolysis hydrogen production system

Abstract

The present invention discloses a liquid level control method and a water electrolysis hydrogen production system. 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 of the electrolytic cell can be cut off, and the hydrogen side gas outlet switch valve and the oxygen side gas outlet switch valve of the water electrolysis hydrogen production equipment can be controlled to be closed. The present invention can monitor the hydrogen side liquid level and the oxygen side liquid level, and when the shutdown condition is reached, directly close the hydrogen side gas outlet switch valve and the oxygen side gas outlet switch valve to stop the discharge of gas. At the same time, the power supply of the electrolytic cell is directly disconnected to stop the production of hydrogen and oxygen. In this way, the water electrolysis hydrogen production equipment neither discharges gas to the outside nor produces gas inside, so as to maintain the liquid level difference between the hydrogen side liquid level and the oxygen side liquid level inside the water electrolysis hydrogen production equipment unchanged, thereby avoiding the liquid level difference between the hydrogen side liquid level and the oxygen side liquid level from further widening, thereby preventing the occurrence of safety accidents. The control of liquid level balance is more timely and accurate.

Description

Technical Field

[0001] The present invention relates to the field of chemical industry, and in particular to a liquid level control method and a water electrolysis hydrogen production system. Background Art

[0002] In a water electrolysis hydrogen production system, maintaining liquid level balance on both sides of the water electrolysis hydrogen production equipment (hydrogen separator and oxygen separator) is crucial to the safety of the hydrogen production system. When the liquid level deviation on both sides is large, the gas on the hydrogen side may leak to the oxygen side or the gas on the oxygen side may leak to the hydrogen side, causing safety accidents such as fire or even explosion.

[0003] Therefore, when the liquid levels on both sides tend to be unbalanced, how to timely and accurately control the liquid levels on both sides to maintain balance has become a technical problem that needs to be solved urgently by people in this field. Summary of the Invention

[0004] In view of the above problems, the present invention provides a liquid level control method and a water electrolysis hydrogen production system to solve the problem of timely and accurately controlling the liquid levels on both sides of the water electrolysis hydrogen production equipment to maintain balance.

[0005] In a first aspect, a liquid level control method comprises:

[0006] 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 of the electrolytic cell is cut off, and the hydrogen side gas outlet switch valve and the oxygen side gas 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 oxygen side of the water electrolysis hydrogen production equipment.

[0007] In combination with the first aspect, in certain optional embodiments, 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 of the electrolytic cell is cut off, and the hydrogen side outlet switch valve and the oxygen side outlet switch valve of the water electrolysis hydrogen production equipment are controlled to be closed, the method further includes:

[0008] Collecting and obtaining the hydrogen side liquid level of the water electrolysis hydrogen production equipment;

[0009] The oxygen side liquid level of the water electrolysis hydrogen production equipment is collected and obtained.

[0010] Optionally, in certain optional embodiments, the collecting and obtaining the hydrogen side liquid level of the water electrolysis hydrogen production equipment includes:

[0011] The liquid level on the hydrogen side of the water electrolysis hydrogen production equipment is collected and obtained through the liquid level collector of the hydrogen separator of the water electrolysis hydrogen production equipment.

[0012] Optionally, in certain optional embodiments, the collecting and obtaining the oxygen side liquid level of the water electrolysis hydrogen production equipment includes:

[0013] The liquid level on the oxygen side of the water electrolysis hydrogen production equipment is collected and obtained through the liquid level collector of the oxygen separator of the water electrolysis hydrogen production equipment.

[0014] Optionally, in certain optional embodiments, after collecting and obtaining the hydrogen side liquid level and the oxygen side liquid level, the method further includes:

[0015] Calculating a liquid level difference between the hydrogen side liquid level and the oxygen side liquid level;

[0016] If the liquid level difference does not reach the shutdown condition, the liquid level difference is input as a feedback value to the first PID algorithm, thereby obtaining a first control variable output by the first PID algorithm;

[0017] According to the first control variable, the liquid level on the hydrogen side and the liquid level on the oxygen side of the water electrolysis hydrogen production equipment are controlled to maintain balance.

[0018] Optionally, in certain optional embodiments, controlling the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production equipment to maintain balance according to the first control amount includes:

[0019] According to the first control quantity, the opening of the hydrogen-side outlet regulating valve of the water electrolysis hydrogen production equipment is controlled to control the hydrogen-side liquid level and the oxygen-side liquid level of the water electrolysis hydrogen production equipment to maintain balance.

[0020] Optionally, in some optional embodiments, the instruction value of the first PID algorithm is pre-set to zero.

[0021] Optionally, in some optional embodiments, the shutdown condition is that the liquid level difference is not less than a preset difference threshold.

[0022] Optionally, in certain optional embodiments, the liquid level difference is equal to the difference between the hydrogen side liquid level and the oxygen side liquid level.

[0023] Optionally, in certain optional embodiments, 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 of the electrolytic cell is cut off, and the hydrogen side outlet switch valve and the oxygen side outlet switch valve of the water electrolysis hydrogen production equipment are controlled to be closed, the method further includes:

[0024] The pressure sensor of the oxygen separator of the water electrolysis hydrogen production equipment is used to collect and obtain the pressure value of the oxygen separator of the water electrolysis hydrogen production equipment;

[0025] Using the pressure value as a feedback value to input into a second PID algorithm, thereby obtaining a second control variable output by the second PID algorithm;

[0026] According to the second control variable, the working pressure of the water electrolysis hydrogen production equipment is controlled to remain stable.

[0027] Optionally, in certain optional embodiments, controlling the operating pressure of the water electrolysis hydrogen production equipment to remain stable according to the second control variable includes:

[0028] According to the second control quantity, the opening of the oxygen-side outlet regulating valve of the water electrolysis hydrogen production equipment is controlled to control the working pressure of the water electrolysis hydrogen production equipment to remain stable.

[0029] In a second aspect, a water electrolysis hydrogen production system includes the hydrogen side, the oxygen side and a controller;

[0030] The hydrogen side and the oxygen side are both in communication with the controller;

[0031] The hydrogen side is used to absorb and discharge hydrogen;

[0032] The oxygen side is used to absorb and discharge oxygen;

[0033] The controller is used in any of the liquid level control methods described above.

[0034] In conjunction with the second aspect, in certain optional embodiments, the hydrogen side includes: a hydrogen side outlet switch valve, a hydrogen side outlet regulating valve and a hydrogen separator;

[0035] The hydrogen separator is used to separate the substances produced by the electrolytic cell to obtain hydrogen and transport the hydrogen to the hydrogen side outlet regulating valve through a pipeline;

[0036] The hydrogen side outlet regulating valve is used to adjust the hydrogen flow rate and transport the hydrogen to the hydrogen side outlet switch valve through a pipeline;

[0037] The hydrogen side outlet switch valve is used to control the discharge of the hydrogen to the outside.

[0038] Optionally, in certain optional embodiments, the oxygen side includes: an oxygen side outlet switch valve, an oxygen side outlet regulating valve and an oxygen separator;

[0039] The oxygen separator is used to separate the substances produced by the electrolytic cell to obtain oxygen and transport the oxygen to the oxygen-side outlet regulating valve through a pipeline;

[0040] The oxygen side outlet regulating valve is used to adjust the oxygen flow rate and transport the oxygen to the oxygen side outlet switch valve through a pipeline;

[0041] The oxygen side outlet switch valve is used to control the discharge of oxygen to the outside.

[0042] Optionally, in certain optional embodiments, the liquid level control system further comprises: a power switch of the electrolytic cell;

[0043] The power switch is used to cut off the input power of the electrolytic cell.

[0044] By means of the above technical solution, the present invention provides a liquid level control method and a water electrolysis hydrogen production system, which can cut off the input power of the electrolytic cell when the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production equipment reach the shutdown condition, and control the hydrogen side gas outlet switch valve and the oxygen side gas outlet switch valve of the water electrolysis hydrogen production equipment to be closed, wherein the gas generated by the electrolytic cell flows to the hydrogen side and oxygen side of the water electrolysis hydrogen production equipment. It can be seen from this that the present invention can monitor the hydrogen side liquid level and the oxygen side liquid level, and when the hydrogen side liquid level and the oxygen side liquid level reach the shutdown condition, directly close the hydrogen side gas outlet switch valve and the oxygen side gas outlet switch valve to stop discharging gas outward. At the same time, directly disconnect the power supply of the electrolytic cell to stop producing hydrogen and oxygen. In this way, the electrolysis water hydrogen production equipment neither discharges gas to the outside nor produces gas inside, so as to maintain the liquid level difference between the hydrogen side liquid level and the oxygen side liquid level inside the electrolysis water hydrogen production equipment unchanged, avoiding the further expansion of the liquid level difference between the hydrogen side liquid level and the oxygen side liquid level to cause a safety accident, and the control of the liquid level balance is more timely and accurate.

[0045] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0047] Figure 1 A flow chart of a first liquid level control method provided by the present invention is shown;

[0048] Figure 2-4 Flowcharts showing three other liquid level control methods provided by the present invention;

[0049] Figure 5-6 Flowcharts showing two other liquid level control methods provided by the present invention;

[0050] Figure 7FIG. 2 shows a schematic diagram of adjusting the first PID algorithm provided by the present invention;

[0051] Figure 8-9 Flowcharts showing two other liquid level control methods provided by the present invention;

[0052] Figure 10 FIG2 shows a schematic diagram of adjusting the second PID algorithm provided by the present invention;

[0053] Figure 11 The present invention provides a schematic structural diagram of a water electrolysis hydrogen production system;

[0054] Figure 12-13 Shows the structural schematic diagrams of two other water electrolysis hydrogen production systems provided by the present invention;

[0055] Figure 14 A schematic structural diagram of another water electrolysis hydrogen production system provided by the present invention is shown;

[0056] Figure 15 A schematic structural diagram of an electronic device provided by the present invention is shown. DETAILED DESCRIPTION

[0057] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0058] like Figure 1 As shown, the present invention provides a liquid level control method, comprising: S100;

[0059] S100. 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 of the electrolytic cell is cut off, and the hydrogen side gas outlet switch valve and the oxygen side gas 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.

[0060] Optionally, the water electrolysis hydrogen production equipment mentioned in the present invention is a general term, which may include a hydrogen side, an oxygen side and a corresponding controller, and the hydrogen side and the oxygen side may include multiple devices respectively.

[0061] Optionally, the present invention may be implemented by a controller of a water electrolysis hydrogen production device. Specifically, when the controller determines that the hydrogen and oxygen liquid levels have reached shutdown conditions, it may issue corresponding control instructions to shut off the power supply to the electrolytic cell and close the hydrogen and oxygen outlet valves, thereby maintaining the level difference between the hydrogen and oxygen liquid levels, thereby preventing a safety incident caused by an increase in the level difference.

[0062] Alternatively, the hydrogen-side liquid level referred to in the present invention may be the liquid level of a hydrogen separator on the hydrogen side, and the oxygen-side liquid level may be the liquid level of an oxygen separator on the oxygen side. The hydrogen-side liquid level and the oxygen-side liquid level may be current liquid levels collected in real time at the same time. The collection frequency may be set according to actual needs, and the present invention does not impose any limitation thereto.

[0063] Therefore, before S100, the present invention needs to collect and obtain the hydrogen side liquid level and the oxygen side liquid level at the same moment, so as to determine whether the hydrogen side liquid level and the oxygen side liquid level reach the shutdown condition.

[0064] That is, Figure 2 As shown, combined Figure 1 In the embodiment shown, in certain optional embodiments, before S100, the method further includes: S80 and S90;

[0065] S80, collecting and obtaining the hydrogen side liquid level of the water electrolysis hydrogen production equipment;

[0066] S90: Acquire the oxygen side liquid level of the water electrolysis hydrogen production equipment.

[0067] Optionally, in the process of collecting the hydrogen side liquid level and the oxygen side liquid level of the present invention, the controller may actively send instructions to the corresponding collector for collection, or the corresponding collector may collect regularly and then actively upload the collected information to the execution entity of the present invention.

[0068] Optionally, there is no necessary order for executing S80 and S90 . S80 may be executed first, or S90 may be executed first, or S80 and S90 may be executed in parallel. The present invention does not impose any limitation on this.

[0069] For example, Figure 3 As shown, combined Figure 2 In the embodiment shown, in some optional embodiments, the S80 includes: S81;

[0070] S81. Obtain the liquid level on the hydrogen side of the equipment for producing hydrogen by electrolysis by water through a liquid level collector of the hydrogen separator of the equipment for producing hydrogen by electrolysis by water.

[0071] Optionally, the liquid level collector described in the present invention can be integrated with the hydrogen separator or can be a standalone collector. The present invention does not impose any specific restrictions on parameters such as the model and size of the liquid level collector. Any collector that can collect the liquid level of a hydrogen separator falls within the scope of protection of the present invention.

[0072] Optionally, the liquid level collector may directly collect the value of the hydrogen side liquid level, or may collect a signal corresponding to the hydrogen side liquid level and obtain the corresponding hydrogen side liquid level value after performing certain processing on the signal.

[0073] For example, Figure 4 As shown, combined Figure 2 In the embodiment shown, in some optional embodiments, the S90 includes: S91;

[0074] S91. Obtain the liquid level on the oxygen side of the equipment for producing hydrogen from electrolyzed water by using a liquid level collector of the oxygen separator of the equipment.

[0075] Optionally, the interpretation of S91 may be understood in the same way as the interpretation of S81, and the present invention will not elaborate on this.

[0076] It should be noted that the scenario on which the present invention is based may be to produce hydrogen by electrolyzing alkaline water. The hydrogen and alkaline solution produced by electrolysis may enter the hydrogen separator together, and the oxygen and alkaline solution produced may enter the oxygen separator together.

[0077] like Figure 5 As shown, combined Figure 2-4 In any of the embodiments shown in , in certain optional embodiments, after collecting and obtaining the hydrogen side liquid level and the oxygen side liquid level, the method further includes: S92, S200 and S300;

[0078] S92, calculating the liquid level difference between the hydrogen side liquid level and the oxygen side liquid level;

[0079] Optionally, the present invention does not limit the specific process for calculating the liquid level difference. For example, the present invention can calculate the difference between the hydrogen side liquid level and the oxygen side liquid level, or it can calculate the difference between the oxygen side liquid level and the hydrogen side liquid level. Of course, the present invention can also calculate the ratio of the hydrogen side liquid level to the oxygen side liquid level, and the ratio can be used to reflect the liquid level difference, and the present invention does not limit this.

[0080] S200, if the liquid level difference does not reach the shutdown condition, inputting the liquid level difference as a feedback value into a first PID algorithm, thereby obtaining a first control variable output by the first PID algorithm;

[0081] Optionally, the shutdown condition of the present invention may be that the liquid level difference reaches a certain difference threshold. Figure 5 In certain optional embodiments of the illustrated embodiment, the shutdown condition is that the liquid level difference is not less than a preset difference threshold, taking the liquid level difference equal to the difference between the hydrogen side liquid level and the oxygen side liquid level as an example. If the absolute value of the difference between the hydrogen side liquid level and the oxygen side liquid level is less than the preset difference threshold, it indicates that the liquid level difference has not met the shutdown condition; if the absolute value of the difference between the hydrogen side liquid level and the oxygen side liquid level is not less than the preset difference threshold, it indicates that the liquid level difference has met the shutdown condition.

[0082] Alternatively, if the liquid level difference does not reach the shutdown condition, it indicates that the shutdown condition has not yet been met, and electrolysis can continue to produce hydrogen and oxygen. However, to prevent a sudden increase in the liquid level difference during electrolysis, a corresponding PID (Proportional Integral Derivative) algorithm (in industrial process control, a control method based on the proportional, integral, and differential error generated by comparing the real-time data collected from the controlled object with a given value) can be used for regulation during the electrolysis process.

[0083] Optional, combined Figure 5 In the illustrated embodiment, in certain optional embodiments, the instruction value of the first PID algorithm is pre-set to zero.

[0084] Optionally, S100 and S200 are two situations, and the collected hydrogen side liquid level and the oxygen side liquid level either reach the shutdown condition or do not reach the shutdown condition, and the present invention does not impose any limitation on this.

[0085] S300: Control the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production equipment to maintain balance according to the first control variable.

[0086] Optionally, the present invention does not impose any specific limitation on the manner of controlling the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production equipment to maintain balance according to the first control quantity.

[0087] For example, Figure 6 As shown, combined Figure 5 In the embodiment shown, in some optional embodiments, the S300 includes: S310;

[0088] S310. Control the opening of the hydrogen-side outlet regulating valve of the water electrolysis hydrogen production equipment according to the first control variable to control the hydrogen-side liquid level and the oxygen-side liquid level of the water electrolysis hydrogen production equipment to maintain balance.

[0089] Optionally, the first control variable may directly represent the opening of the hydrogen-side gas outlet regulating valve. After obtaining the first control variable, the opening of the hydrogen-side gas outlet regulating valve may be directly controlled to be the first control variable.

[0090] Optionally, the PID algorithm (including the first PID algorithm and the second PID algorithm) described in the present invention can be executed by a PID regulator integrated in the controller to perform corresponding PID regulation. The final execution unit of the first PID algorithm is the hydrogen side outlet gas regulating valve. That is, the first PID regulator outputs a first control variable based on the command value and the liquid level difference, which acts on the hydrogen side outlet gas regulating valve to control the opening of the hydrogen side outlet gas regulating valve.

[0091] Optionally, the adjustment diagram of the first PID algorithm is as follows: Figure 7 As shown, where ΔL0 is the difference between the command value and the liquid level gap, D T1 is the first control quantity.

[0092] like Figure 8 As shown, combined Figure 1-4 In the embodiment shown, in certain optional embodiments, before S100, the method further includes: S50, S60 and S70;

[0093] S50, collecting a pressure value of the oxygen separator of the water electrolysis hydrogen production equipment through a pressure sensor of the oxygen separator of the water electrolysis hydrogen production equipment;

[0094] Optionally, the pressure value of the oxygen separator mentioned in the present invention refers to the pressure value of the stored oxygen inside the oxygen separator.

[0095] Optional, Figure 8 The embodiment can be understood as follows: under the premise that the liquid level on the hydrogen side and the liquid level on the oxygen side have not reached the shutdown condition, the pressure value of the oxygen separator can be collected during the operation of the entire water electrolysis hydrogen production equipment, so as to facilitate the subsequent control of the working pressure of the water electrolysis hydrogen production equipment according to the pressure value to maintain stability. The present invention does not limit this.

[0096] S60, inputting the pressure value as a feedback value into a second PID algorithm, thereby obtaining a second control variable output by the second PID algorithm;

[0097] S70. Control the working pressure of the water electrolysis hydrogen production equipment to remain stable according to the second control variable.

[0098] Optionally, as mentioned above, the second PID algorithm can be executed by a PID regulator integrated in the controller to perform corresponding PID regulation. That is, the second PID regulator outputs the second control variable based on the command value (preset working pressure value) and the pressure value.

[0099] like Figure 9 As shown, combined Figure 8 In the embodiment shown, in some optional embodiments, the S70 includes: S71;

[0100] S71. Control the opening of the oxygen-side gas outlet regulating valve of the water electrolysis hydrogen production equipment according to the second control variable to control the working pressure of the water electrolysis hydrogen production equipment to remain stable.

[0101] Optionally, the second control quantity acts on the oxygen side outlet regulating valve to control the opening of the oxygen side outlet regulating valve. The adjustment diagram of the second PID algorithm is as follows: Figure 10 As shown, ΔP0 is the difference between the preset working pressure value and the currently detected pressure value, D T2 is the second control quantity.

[0102] It can be seen from this that the present invention can monitor the hydrogen side liquid level and the oxygen side liquid level, and when the hydrogen side liquid level and the oxygen side liquid level reach the shutdown condition, directly close the hydrogen side gas outlet switch valve and the oxygen side gas outlet switch valve to stop discharging gas outwards. Simultaneously, directly disconnect the power supply of the electrolyzer to stop producing hydrogen and oxygen. In this way, the electrolytic water hydrogen production equipment neither discharges gas outwards nor produces gas inside, so as to maintain the liquid level difference between the hydrogen side liquid level and the oxygen side liquid level inside the electrolytic water hydrogen production equipment unchanged, thereby avoiding the liquid level difference between the hydrogen side liquid level and the oxygen side liquid level from further expanding and causing the occurrence of safety accidents, and more timely and accurate control of the liquid level balance.

[0103] like Figure 11 As shown, the present invention provides a water electrolysis hydrogen production system, including the hydrogen side 100, the oxygen side 200 and the controller 300;

[0104] The hydrogen side 100 and the oxygen side 200 are both in communication with the controller 300;

[0105] The hydrogen side 100 is used to absorb and discharge hydrogen;

[0106] The oxygen side 200 is used to absorb and discharge oxygen;

[0107] The controller 300 is used in any of the above-mentioned liquid level control methods.

[0108] like Figure 12 As shown, combined Figure 11 In the embodiment shown, in certain optional embodiments, the hydrogen side 100 includes: a hydrogen side outlet switch valve 110, a hydrogen side outlet regulating valve 120 and a hydrogen separator 130;

[0109] The hydrogen separator 130 is used to separate the substances produced by the electrolytic cell to obtain hydrogen and transport the hydrogen to the hydrogen-side outlet regulating valve 120 through a pipeline;

[0110] The hydrogen side outlet regulating valve 120 is used to adjust the hydrogen flow rate and transport the hydrogen to the hydrogen side outlet switch valve 110 through a pipeline;

[0111] The hydrogen outlet switch valve 110 is used to control the discharge of hydrogen to the outside.

[0112] Optionally, the hydrogen separator 130 may be a gas-liquid separator for separating hydrogen from alkali solution. The hydrogen may be transported along a pipeline to the hydrogen-side outlet regulating valve 120 , and the alkali solution may flow back into the electrolytic cell.

[0113] like Figure 13 As shown, combined Figure 11-12 In any of the embodiments shown in , in some optional embodiments, the oxygen side 200 includes: an oxygen side outlet switch valve 210, an oxygen side outlet regulating valve 220 and an oxygen separator 230;

[0114] The oxygen separator 230 is used to separate the substances produced by the electrolytic cell to obtain oxygen and transport the oxygen to the oxygen-side outlet regulating valve 220 through a pipeline;

[0115] The oxygen side outlet regulating valve 220 is used to adjust the oxygen flow rate and transport the oxygen to the oxygen side outlet switch valve 210 through a pipeline;

[0116] The oxygen-side outlet switch valve 210 is used to control the discharge of oxygen to the outside.

[0117] Optionally, the oxygen separator 230 may be a gas-liquid separator for separating oxygen from the alkali solution. The oxygen may be transported along a pipeline to the oxygen-side gas outlet regulating valve 220 , and the alkali solution may flow back into the electrolytic cell.

[0118] like Figure 14 As shown, combined Figure 13 In certain optional embodiments of the embodiment shown, the liquid level control system further includes: a power switch 400 for the electrolytic cell;

[0119] The power switch 400 is used to cut off the input power of the electrolytic cell.

[0120] The present invention provides a computer-readable storage medium having a program stored thereon, wherein the program, when executed by a processor, implements any of the above-mentioned liquid level control methods.

[0121] In summary, the present invention can monitor the hydrogen side liquid level and the oxygen side liquid level, and when the hydrogen side liquid level and the oxygen side liquid level reach the shutdown condition, directly close the hydrogen side gas outlet switch valve and the oxygen side gas outlet switch valve to stop the gas from being discharged outward. At the same time, directly disconnect the power supply of the electrolytic cell to stop the production of hydrogen and oxygen. In this way, the electrolysis water hydrogen production equipment neither discharges gas outward nor produces gas inside, so as to maintain the liquid level difference between the hydrogen side liquid level and the oxygen side liquid level inside the electrolysis water hydrogen production equipment unchanged, thereby avoiding the liquid level difference between the hydrogen side liquid level and the oxygen side liquid level from further expanding and causing a safety accident, and the control of the liquid level balance is more timely and accurate.

[0122] like Figure 15 As shown, the present invention provides an electronic device 70, which includes at least one processor 701, and at least one memory 702 and a bus 703 connected to the processor 701; wherein the processor 701 and the memory 702 communicate with each other through the bus 703; the processor 701 is used to call the program instructions in the memory 702 to execute any of the liquid level control methods described above.

[0123] In the present invention, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0124] Each embodiment in this specification is described in a related manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiment is generally similar to the method embodiment, so the description is relatively simple. For related parts, refer to the description of the method embodiment.

[0125] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to be embodied in the widest possible manner consistent with the principles and novel features disclosed herein.

[0126] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A liquid level control method, characterized in that: include: 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 of the electrolytic cell is cut off, and the hydrogen side gas outlet switch valve and the oxygen side gas 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, and the shutdown condition is that the liquid level difference is not less than the preset difference threshold, and the liquid level difference is equal to the difference between the hydrogen side liquid level and the oxygen side liquid level.

2. The method according to claim 1, characterized in that 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 of the electrolytic cell is cut off, and before the hydrogen side outlet switch valve and the oxygen side outlet switch valve of the water electrolysis hydrogen production equipment are controlled to be closed, the method further includes: Collecting and obtaining the hydrogen side liquid level of the water electrolysis hydrogen production equipment; The oxygen side liquid level of the water electrolysis hydrogen production equipment is collected and obtained.

3. The method according to claim 2, characterized in that The collecting and obtaining of the hydrogen side liquid level of the water electrolysis hydrogen production equipment includes: The liquid level on the hydrogen side of the water electrolysis hydrogen production equipment is collected and obtained through the liquid level collector of the hydrogen separator of the water electrolysis hydrogen production equipment.

4. The method according to claim 2, characterized in that The collecting and obtaining of the oxygen side liquid level of the water electrolysis hydrogen production equipment includes: The liquid level on the oxygen side of the water electrolysis hydrogen production equipment is collected and obtained through the liquid level collector of the oxygen separator of the water electrolysis hydrogen production equipment.

5. The method according to any one of claims 2 to 4, characterized in that After acquiring the hydrogen side liquid level and the oxygen side liquid level, the method further includes: 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 input as a feedback value to the first PID algorithm, thereby obtaining a first control variable output by the first PID algorithm; According to the first control variable, the liquid level on the hydrogen side and the liquid level on the oxygen side of the water electrolysis hydrogen production equipment are controlled to maintain balance.

6. The method according to claim 5, characterized in that The controlling, according to the first control variable, of the hydrogen side liquid level and the oxygen side liquid level of the water electrolysis hydrogen production equipment to maintain a balance includes: According to the first control quantity, the opening of the hydrogen-side outlet regulating valve of the water electrolysis hydrogen production equipment is controlled to control the hydrogen-side liquid level and the oxygen-side liquid level of the water electrolysis hydrogen production equipment to maintain balance.

7. The method according to claim 5, characterized in that The command value of the first PID algorithm is preset to zero.

8. The method according to any one of claims 1 to 4, characterized in that 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 of the electrolytic cell is cut off, and before the hydrogen side outlet switch valve and the oxygen side outlet switch valve of the water electrolysis hydrogen production equipment are controlled to be closed, the method further includes: The pressure sensor of the oxygen separator of the water electrolysis hydrogen production equipment is used to collect and obtain the pressure value of the oxygen separator of the water electrolysis hydrogen production equipment; Using the pressure value as a feedback value to input into a second PID algorithm, thereby obtaining a second control variable output by the second PID algorithm; According to the second control variable, the working pressure of the water electrolysis hydrogen production equipment is controlled to remain stable.

9. The method according to claim 8, characterized in that The step of controlling the working pressure of the water electrolysis hydrogen production equipment to remain stable according to the second control variable includes: According to the second control quantity, the opening of the oxygen-side outlet regulating valve of the water electrolysis hydrogen production equipment is controlled to control the working pressure of the water electrolysis hydrogen production equipment to remain stable.

10. A water electrolysis hydrogen production system, characterized in that: comprising the hydrogen side, the oxygen side and the controller; The hydrogen side and the oxygen side are both in communication with the controller; The hydrogen side is used to absorb and discharge hydrogen; The oxygen side is used to absorb and discharge oxygen; The controller is used to execute the liquid level control method according to any one of claims 1 to 9.

11. The water electrolysis hydrogen production system according to claim 10, characterized in that: The hydrogen side includes: a hydrogen side outlet switch valve, a hydrogen side outlet regulating valve and a hydrogen separator; The hydrogen separator is used to separate the substances produced by the electrolytic cell to obtain hydrogen and transport the hydrogen to the hydrogen side outlet regulating valve through a pipeline; The hydrogen side outlet regulating valve is used to adjust the hydrogen flow rate and transport the hydrogen to the hydrogen side outlet switch valve through a pipeline; The hydrogen side outlet switch valve is used to control the discharge of the hydrogen to the outside.

12. The water electrolysis hydrogen production system according to any one of claims 10-11, characterized in that: The oxygen side includes: an oxygen side outlet switch valve, an oxygen side outlet regulating valve and an oxygen separator; The oxygen separator is used to separate the substances produced by the electrolytic cell to obtain oxygen and transport the oxygen to the oxygen-side outlet regulating valve through a pipeline; The oxygen side outlet regulating valve is used to adjust the oxygen flow rate and transport the oxygen to the oxygen side outlet switch valve through a pipeline; The oxygen side outlet switch valve is used to control the discharge of oxygen to the outside.

13. The water electrolysis hydrogen production system according to claim 12, characterized in that: Also includes: a power switch of the electrolytic cell; The power switch is used to cut off the input power of the electrolytic cell.

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