PEM electrolytic tank membrane expansion control method and device
By regulating the current and gas pressure when the PEM electrolytic cell is shut down, the hydrogen in the proton exchange membrane is slowly discharged, which solves the problem of uneven expansion when the electrolytic cell stops running, extends the service life of the membrane and prevents mechanical damage.
Patent Information
- Application Number
- CN202411408935.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-01-24
AI Technical Summary
When the PEM electrolytic cell is stopped, the residual hydrogen gas inside the proton exchange membrane causes uneven expansion, resulting in mechanical damage, damage to the porous transport layer and aging of the catalytic layer.
When receiving the shutdown instruction, determine whether the initial current value of the electrolytic battery exceeds the current threshold. If it exceeds, the current is slowly adjusted to cutting the threshold; if it is not exceeded, cut the current directly. After cutting the current, slowly reduce the gas pressure of the cathode chamber, and slowly pass the de -ion water into the cathode chamber until it is filled at the preset flow rate to discharge the residual hydrogen.
By controlling the current and gas pressure, the hydrogen in the proton exchange membrane is slowly discharged to avoid uneven expansion, extend the service life of the membrane, and prevent mechanical damage and aging of the catalytic layer.
Smart Images
Figure CN119352097A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of hydrogen production by water electrolysis, and in particular to a method and device for controlling membrane expansion of a PEM electrolytic cell. Background Art
[0002] PEM (Proton Exchange Membrane) electrolysis is an efficient water electrolysis hydrogen production technology that decomposes water molecules by applying an external voltage to produce hydrogen and oxygen. During the operation of the PEM electrolyzer, the pressure of the hydrogen produced on the cathode side is higher than the pressure of the oxygen produced on the anode side, forming a pressure difference on both sides of the proton exchange membrane. The thickness of the proton exchange membrane is relatively thick, like a thick "sponge". Under the action of the pressure difference, the hydrogen produced on the cathode side can easily penetrate into the "sponge" of the proton exchange membrane. Due to the special structure of the proton exchange membrane, hydrogen is "easy to enter but difficult to exit" in the proton exchange membrane. When the PEM electrolyzer stops running, hydrogen remains inside the proton exchange membrane, and the proton exchange membrane expands unevenly, resulting in mechanical damage to the proton exchange membrane, mechanical damage to the porous transport layer, and aging of the catalytic layer. Summary of the invention
[0003] The present application provides a method and device for controlling the expansion of a PEM electrolytic cell membrane, which solves the technical problem of uneven expansion of a proton exchange membrane due to residual hydrogen, and achieves the technical effect of controlling the expansion of the proton exchange membrane.
[0004] In order to achieve the above objectives, the main technical solutions adopted in this application include:
[0005] In a first aspect, an embodiment of the present application provides a method for controlling membrane expansion of a PEM electrolytic cell, the method comprising: upon receiving a shutdown command from a requesting party, determining whether an initial current value of the electrolytic cell exceeds a current threshold, and if so, slowly reducing the current of the electrolytic cell to within the current threshold, and then cutting off the current of the electrolytic cell; if not, directly cutting off the current of the electrolytic cell; when cutting off the current of the electrolytic cell, slowly reducing the gas pressure of the cathode chamber to within the gas pressure threshold, and then slowly passing deionized water into the cathode chamber at a first preset flow rate until it is filled.
[0006] The PEM electrolytic cell membrane expansion control method provided in the present embodiment determines whether the initial current value of the electrolytic cell exceeds the current threshold value when a shutdown command is received from a requesting party. If so, the current of the electrolytic cell is slowly reduced to within the current threshold value, and then the current of the electrolytic cell is cut off; if not, the current of the electrolytic cell is directly cut off; when the current of the electrolytic cell is cut off, the gas pressure of the cathode chamber is slowly reduced to within the gas pressure threshold value, and then deionized water is slowly introduced into the cathode chamber at a first preset flow rate until the cathode chamber is filled, thereby solving the technical problem of uneven expansion of the proton exchange membrane due to residual hydrogen and achieving the technical effect of controlling the expansion of the proton exchange membrane.
[0007] Optionally, in the process of slowly reducing the current of the electrolytic cell to within the current threshold, the current is reduced according to a preset current reduction rate, and the preset current reduction rate is set according to the state of the electrolytic cell; or, the preset current reduction rate is regulated according to the power supply state and the electrolytic cell state.
[0008] Optionally, the preset current reduction rate is set to 0.05A / cm per minute. 2 The current density corresponding to the current threshold is set to 0.3A / cm 2 .
[0009] Optionally, in the process of slowly lowering the gas pressure in the cathode chamber to within the gas pressure threshold, the gas pressure is lowered at a preset pressure reduction rate, wherein the preset pressure reduction rate is set according to the state of the electrolytic cell; or, the preset pressure reduction rate is regulated according to the power supply state and the electrolytic cell state.
[0010] Optionally, the gas pressure threshold is set to 0 barg, and slowly reducing the gas pressure in the cathode chamber to within the gas pressure threshold specifically includes: slowly reducing the gas pressure in the cathode chamber to 0 barg within 5-6 minutes.
[0011] Optionally, the first preset flow rate is less than or equal to 30 L / min.
[0012] Optionally, slowly introducing deionized water into the anode chamber at a second preset flow rate for a specified time period specifically includes: introducing deionized water into the anode chamber at a flow rate of 0.1-2 L / min for one minute.
[0013] Optionally, the method further comprises: when the current of the electrolytic cell is cut off, slowly introducing deionized water into the anode chamber at a second preset flow rate and running the process for a specified time.
[0014] In a second aspect, an embodiment of the present application provides a PEM electrolytic cell membrane expansion control device, the device comprising: a current control module, for determining whether an initial current value of the electrolytic cell exceeds a current threshold value upon receiving a shutdown command from a requesting party, and if so, slowly reducing the current of the electrolytic cell to within the current threshold value, and then cutting off the current of the electrolytic cell; if not, directly cutting off the current of the electrolytic cell; a hydrogen discharge control module, for slowly reducing the gas pressure of the cathode chamber to within the gas pressure threshold value when cutting off the current of the electrolytic cell, and then slowly passing deionized water into the cathode chamber at a first preset flow rate until it is filled.
[0015] Optionally, the device further comprises: an oxygen exhaust control module, which is used to slowly introduce deionized water into the anode chamber at a second preset flow rate and run for a specified time when the current of the electrolytic cell is cut off.
[0016] In a third aspect, an embodiment of the present application provides a computer device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, computer instructions are stored in the memory, and the processor executes the above method by executing the computer instructions.
[0017] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions are used to enable a computer to execute the above method.
[0018] In a fifth aspect, an embodiment of the present application provides a computer program product, including computer instructions, which are used to enable a computer to execute the above method. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0020] Figure 1 A schematic diagram of a PEM electrolytic cell membrane expansion control method provided in an embodiment of the present application;
[0021] Figure 2 A schematic diagram of a PEM electrolytic cell membrane expansion control device provided in an embodiment of the present application;
[0022] Figure 3 A schematic diagram of the structure of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0024] In addition, the descriptions involving "first", "second", etc. in this application are for descriptive purposes only and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more. In addition, the use of "based on" or "according to" means openness and inclusiveness, because the process, steps, calculations or other actions "based on" or "according to" one or more of the conditions or values can be based on additional conditions or beyond the described values in practice.
[0025] PEM (Proton Exchange Membrane) electrolysis is an efficient water electrolysis hydrogen production technology that decomposes water molecules by applying an external voltage to produce hydrogen and oxygen. During the operation of the PEM electrolyzer, the pressure of hydrogen produced on the cathode side is higher than the pressure of oxygen produced on the anode side, forming a pressure difference on both sides of the proton exchange membrane. The thickness of the proton exchange membrane is relatively thick, like a thick "sponge". Under the action of the pressure difference, the hydrogen produced on the cathode side can easily penetrate into the "sponge" of the proton exchange membrane. Due to the special structure of the proton exchange membrane, hydrogen is "easy to enter and difficult to exit" in the proton exchange membrane. When the PEM electrolyzer stops running, the air pressure in the chamber gradually decreases to atmospheric pressure. Since there is hydrogen remaining inside the proton exchange membrane, the gas pressure inside the proton exchange membrane is higher than the gas pressure in the chamber, resulting in uneven expansion of the proton exchange membrane, causing mechanical damage to the proton exchange membrane, mechanical damage to the porous transport layer, and aging of the catalyst.
[0026] The embodiment of the present application provides a method for controlling the expansion of a PEM electrolytic cell membrane, which controls the uneven expansion of the proton exchange membrane by regulating the current of the electrolytic cell, the gas pressure of the cathode chamber, and introducing deionized water into the chamber of the electrolytic cell, so that the hydrogen in the proton exchange membrane is slowly discharged.
[0027] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.
[0028] Please refer to Figure 1 , Figure 1 : is a flow chart of a PEM electrolytic cell membrane expansion control method provided in an embodiment of the present application, the process comprises the following steps:
[0029] Step S1, upon receiving a shutdown command from a requesting party, determine whether the initial current value of the electrolytic cell exceeds a current threshold value, if so, slowly reduce the current of the electrolytic cell to within the current threshold value, and then cut off the current of the electrolytic cell; if not, directly cut off the current of the electrolytic cell.
[0030] The initial current is the operating current of the electrolytic cell at the moment of receiving the shutdown command. The current threshold is determined by repeatedly testing the electrolytic cell. The generation and sending of the shutdown command can be selected according to different operating modes. For example, it can be a preset command. In this case, the requester is a computer device, and the computer device directly sends the shutdown command. In addition, the shutdown command can also be a manual command. In this case, the requester is an operator, and the operator decides whether to send the shutdown command according to the operating status of the electrolytic cell.
[0031] In some embodiments, the shutdown command may be pre-set and automatically sent by the computer system at a specific operation stage of the electrolytic cell.
[0032] In some embodiments, the shutdown command may be sent manually. The manual command is determined based on the judgment of the operator and the actual operating conditions of the electrolytic cell.
[0033] After the current of the electrolytic cell is cut off, the current value of the electrolytic cell is zero ampere, and no electrolytic reaction occurs in the electrolytic cell. When the initial current value of the electrolytic cell exceeds the current threshold, the hydrogen concentration in the proton exchange membrane is high. If the current of the electrolytic cell is directly cut off, the pressure difference between the inside and outside of the proton exchange membrane will be too large, which is easy to cause uneven expansion and mechanical damage to the membrane. When the initial current value of the electrolytic cell exceeds the current threshold, the current of the electrolytic cell needs to be slowly reduced to within the current threshold. When the current current value of the electrolytic cell is less than or equal to the current threshold, the hydrogen concentration in the proton exchange membrane is low, and the current of the electrolytic cell can be directly cut off, which will not cause mechanical damage to the membrane, and it is helpful for hydrogen to be discharged from the inside of the proton exchange membrane. The internal and external pressure difference of the proton exchange membrane needs to be controlled within a certain range, so that the hydrogen in the proton exchange membrane is slowly released, and the internal and external pressure difference of the proton exchange membrane is avoided. Too large mechanical damage to the membrane.
[0034] Step S3, when the current of the electrolytic cell is cut off, the gas pressure in the cathode chamber is slowly reduced to within the gas pressure threshold, and then deionized water is slowly introduced into the cathode chamber at a first preset flow rate until the cathode chamber is filled.
[0035] After the current of the electrolytic cell is cut off, the current value of the electrolytic cell is zero ampere, and no electrolytic reaction occurs in the electrolytic cell. If the gas pressure in the cathode chamber is rapidly reduced at this time, the rate of change of the gas pressure in the cathode chamber is too large, which may cause rapid expansion of the proton exchange membrane, thereby causing mechanical damage to the membrane. Therefore, when the current of the electrolytic cell is cut off, it is necessary to slowly lower the gas pressure in the cathode chamber to allow the residual hydrogen in the proton exchange membrane to be slowly discharged, so that the expansion of the proton exchange membrane is within the control range, and the proton exchange membrane will not be mechanically damaged.
[0036] When the gas pressure in the cathode chamber is lowered to within the gas pressure threshold, deionized water is slowly introduced into the cathode chamber at a first preset flow rate until it is filled. In the process of introducing deionized water, the hydrogen remaining in the proton exchange membrane is discharged. If the flow rate of the deionized water is too large, it is also easy to cause uneven expansion of the membrane. Therefore, the flow rate of deionized water introduced into the cathode chamber needs to be controlled within the first preset flow rate range, which is conducive to slowly discharging the hydrogen remaining in the proton exchange membrane, controlling the uneven expansion of the membrane, and protecting the proton exchange membrane from damage. Fill the cathode chamber with deionized water to ensure that the proton conductor in the electrolytic cell is in a wet state.
[0037] In some embodiments, the first preset flow rate is less than or equal to 30 L / min.
[0038] In some embodiments, in the process of slowly reducing the current of the electrolytic cell to within the current threshold, the current is reduced at a preset current reduction rate, and the preset current reduction rate is set according to the state of the electrolytic cell; alternatively, the preset current reduction rate is regulated according to the power supply state and the electrolytic cell state.
[0039] In some embodiments, the current reduction rate can be set according to different operating modes, can be loaded according to a preset current reduction rate, or can be manually adjusted according to the power supply and electrolytic cell status, and the current reduction rate can be set according to actual conditions.
[0040] Specifically, if a preset current reduction rate is used for loading, the current is reduced at the set rate to achieve a linear reduction in current; if manual control is used, the operator is required to manually adjust the current according to the status of the power supply and the electrolytic cell.
[0041] In some embodiments, the preset current reduction rate is set to reduce the current density by 0.05 A / cm per minute. 2 The current density corresponding to the current threshold is set to 0.3A / cm 2 .
[0042] In some embodiments, in the process of slowly lowering the gas pressure in the cathode chamber to within the gas pressure threshold, the gas pressure is lowered at a preset pressure reduction rate, and the preset pressure reduction rate is set according to the state of the electrolytic cell; alternatively, the preset pressure reduction rate is regulated according to the power supply state and the electrolytic cell state.
[0043] In some embodiments, the voltage reduction rate can be set according to different operation modes, can be loaded according to a preset voltage reduction rate, or can be manually adjusted according to the power supply and the state of the electrolytic cell, and the voltage reduction rate can be set according to actual conditions.
[0044] Specifically, if a preset pressure reduction rate is used for loading, the air pressure decreases at the set rate to achieve a linear reduction in air pressure; if manual control is used, the operator is required to manually adjust the air pressure according to the status of the power supply and the electrolytic cell.
[0045] In some embodiments, the gas pressure threshold is set to 0 barg. Slowly lowering the gas pressure in the cathode chamber to within the gas pressure threshold specifically includes: slowly lowering the gas pressure in the cathode chamber to 0 barg within 5-6 minutes.
[0046] In some embodiments, the PEM electrolytic cell membrane expansion control method provided in the embodiments of the present application further includes: when the current of the electrolytic cell is cut off, deionized water is slowly introduced into the anode chamber at a second preset flow rate and runs for a specified time.
[0047] Deionized water is slowly introduced into the anode chamber at a second preset flow rate. The purpose of this step is to remove the oxygen in the anode chamber as much as possible. After the current of the electrolytic cell is cut off, deionized water can be introduced into the anode chamber. This is a general operation after shutdown (referring to cutting off the current of the electrolytic cell).
[0048] In some embodiments, deionized water is passed into the anode fluid channel at a flow rate of 0.1-2 L / min for one minute.
[0049] In some embodiments, after the cathode chamber is filled with deionized water, the cathode chambers need to be closed. If the electrolytic cell has not been used in recent days, it is necessary to check whether the top of the cathode chamber is still filled with water within a few days after the above operation. If it is not filled, it is necessary to continue to replenish water. If the electrolytic cell is not used for a long time, it is necessary to regularly observe the amount of water in the cathode chamber and replenish water in time to ensure that the amount of water in the cathode chamber of the electrolytic cell is maintained above the preset high water level for a long time to ensure that the proton conductor in the electrolytic cell is in a moist state. For example, in daily maintenance, maintenance is required about once a month, mainly by replenishing water at the cathode.
[0050] The PEM electrolytic cell membrane expansion control method provided in the present embodiment determines whether the initial current value of the electrolytic cell exceeds the current threshold value when a shutdown command is received from a requesting party. If so, the current of the electrolytic cell is slowly reduced to within the current threshold value, and then the current of the electrolytic cell is cut off; if not, the current of the electrolytic cell is directly cut off; when the current of the electrolytic cell is cut off, the gas pressure of the cathode chamber is slowly reduced to within the gas pressure threshold value, and then deionized water is slowly introduced into the cathode chamber at a first preset flow rate until the cathode chamber is filled, thereby solving the technical problem of uneven expansion of the proton exchange membrane due to residual hydrogen and achieving the technical effect of controlling the expansion of the proton exchange membrane.
[0051] Taking a 50kW PEM electrolyzer as an example, the proton exchange membrane expansion control method can be divided into the following two specific cases for explanation, where the current density corresponding to the current threshold is 0.3A / cm 2 :
[0052] The first case: When the electrolytic cell is operating normally, the current density of the electrolytic cell at the current moment is ≤0.3A / cm 2 , and the electrolytic cell operates stably under the operating current density for more than 5 minutes. At this time, the shutdown command sent by the requester is received, and after judgment, it is concluded that the initial current value of the electrolytic cell does not exceed the current threshold (0.3A / cm 2 ). Therefore, the test system directly executes the shutdown command, that is, directly cuts off the current of the electrolytic cell, and stops the hydrolysis reaction in the electrolytic cell. When the current of the electrolytic cell is cut off, the gas pressure in the cathode chamber may be greater than the preset gas pressure of 0.2 barg. The cathode gas discharge valve is opened smaller, so that the gas pressure in the cathode chamber is slowly lowered to the gas pressure threshold. Specifically, the time for the gas pressure in the cathode chamber to drop to the gas pressure threshold of 0 barg is completed within about 5-6 minutes. After the pressure reduction operation, in the cathode fluid channel, room temperature deionized water is slowly introduced at a flow rate of less than or equal to 30L / min until the cathode chamber is filled, and then the water source of the cathode is turned off. After the electrolytic cell is shut down, deionized water is introduced into the anode fluid channel at a flow rate of 0.1-2L / min for 1 minute, and then the water source of the anode is turned off.
[0053] After the electrolytic cell is shut down, the gas trapped in the electrolytic cell may be transferred to the top of the cathode chamber, resulting in the cathode chamber not being filled with deionized water. If the electrolytic cell is not used in the past few days, it is necessary to check whether the top of the cathode chamber is still filled with water within a few days after the above operation. If it is found that the area is not filled with deionized water, it is necessary to continue to add water in the cathode chamber. If the electrolytic cell is not used for a long time, it needs to be maintained about once a month in daily maintenance, mainly by replenishing water to the cathode.
[0054] The second case: When the electrolytic cell is operating normally, the current density of the electrolytic cell at the current moment is greater than 0.3A / cm 2 At this time, the shutdown command from the requesting party is received, and it is judged that the initial current value of the electrolytic cell exceeds the current threshold (0.3A / cm 2 Therefore, the test system executes the current reduction instruction to 0.05A / cm per minute. 2 After the current of the electrolytic cell is slowly reduced to within the current threshold at a rate, the shutdown command is executed, that is, the current of the electrolytic cell is cut off. When the current of the electrolytic cell is cut off, the air pressure in the cathode chamber is greater than the preset air pressure of 0.5 barg through air pressure detection. Therefore, the test system opens the cathode gas discharge valve smaller, so that the gas pressure in the cathode chamber is reduced to the air pressure threshold of 0 barg in about 5-6 minutes. After the pressure reduction operation, in the cathode fluid channel, room temperature deionized water is slowly introduced at a flow rate of less than or equal to 30L / min until the cathode chamber is filled, and then the water source of the cathode is turned off. At the same time, in the anode fluid channel, deionized water is introduced at a flow rate of 0.1-2L / min, and the introduction duration is 1 minute, and then the water source of the anode is turned off.
[0055] After the electrolytic cell is shut down, the gas trapped in the electrolytic cell may be transferred to the top of the cathode chamber, resulting in the top of the cathode chamber not being fully filled. Therefore, if the electrolytic cell is not used in the past few days, it is necessary to check whether the top of the cathode chamber is still filled with water within a few days after the above operation. If it is not filled, it is necessary to continue to add water. If the electrolytic cell is not used for a long time, it needs to be maintained about once a month in daily maintenance, mainly by adding water to the cathode.
[0056] Please refer to Figure 2 , Figure 2 : This is a schematic diagram of a PEM electrolytic cell membrane expansion control device provided in an embodiment of the present application, the device comprising: a current control module, which is used to determine whether the initial current value of the electrolytic cell exceeds the current threshold value when a shutdown command is received from a requesting party, and if so, slowly reduce the current of the electrolytic cell to within the current threshold value, and then cut off the current of the electrolytic cell; if not, directly cut off the current of the electrolytic cell; a hydrogen discharge control module, which is used to slowly reduce the gas pressure of the cathode chamber to within the gas pressure threshold value when the current of the electrolytic cell is cut off, and then slowly pass deionized water into the cathode chamber at a first preset flow rate until it is filled.
[0057] In some embodiments, a PEM electrolytic cell membrane expansion control device provided in an embodiment of the present application further includes: an oxygen exhaust control module, which is used to slowly introduce deionized water into the anode chamber at a second preset flow rate and run for a specified time when the current of the electrolytic cell is cut off.
[0058] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.
[0059] The PEM electrolyzer membrane expansion control device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.
[0060] See also Figure 3 , Figure 3 is a schematic diagram of the structure of a computer device provided in an embodiment of the present application, such as Figure 3 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 3 A processor 10 is taken as an example.
[0061] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.
[0062] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.
[0063] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.
[0064] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.
[0065] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.
[0066] The embodiment of the present application also provides a computer-readable storage medium. The above method according to the embodiment of the present application can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.
[0067] The embodiment of the present application provides a computer program product, which includes computer instructions, which are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the method of any embodiment of the present application.
[0068] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.
[0069] The systems, devices or modules described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
[0070] For the convenience of description, the above device is described in various units according to their functions. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.
[0071] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.
[0072] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.
[0073] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1A function specified in one or more boxes.
[0074] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.
[0075] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.
[0076] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.
[0077] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.
[0078] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.
Claims
1. A method for controlling membrane expansion of a PEM electrolyzer, characterized in that: The method comprises: Upon receiving a shutdown command from the requesting party, determining whether the initial current value of the electrolytic cell exceeds the current threshold, if so, slowly reducing the current of the electrolytic cell to within the current threshold, and then cutting off the current of the electrolytic cell; if not, directly cutting off the current of the electrolytic cell; When the current of the electrolytic cell is cut off, the gas pressure in the cathode chamber is slowly lowered to within the gas pressure threshold, and then deionized water is slowly introduced into the cathode chamber at a first preset flow rate until the cathode chamber is filled.
2. The method according to claim 1, characterized in that In the process of slowly reducing the current of the electrolytic cell to within the current threshold, reducing the current at a preset current reduction rate, wherein the preset current reduction rate is set according to the state of the electrolytic cell; Alternatively, the preset current reduction rate is regulated according to the power supply state and the electrolytic cell state.
3. The method according to claim 2, characterized in that The preset current reduction rate is set to 0.05A / cm per minute 2 The current density corresponding to the current threshold is set to 0.3A / cm 2 .
4. The method according to claim 1, characterized in that: In the process of slowly lowering the gas pressure in the cathode chamber to within the gas pressure threshold, lowering the gas pressure at a preset pressure reduction rate, wherein the preset pressure reduction rate is set according to the state of the electrolytic cell; Alternatively, the preset voltage reduction rate is regulated according to the power supply status and the electrolytic cell status.
5. The method according to claim 4, characterized in that The gas pressure threshold is set to 0 barg, and slowly reducing the gas pressure in the cathode chamber to within the gas pressure threshold specifically includes: slowly reducing the gas pressure in the cathode chamber to 0 barg within 5-6 minutes.
6. The method according to claim 1, characterized in that The first preset flow rate is less than or equal to 30 L / min.
7. The method according to claim 1, characterized in that The method further comprises: when the current of the electrolytic cell is cut off, slowly introducing deionized water into the anode chamber at a second preset flow rate and running the flow for a specified time.
8. The method according to claim 7, characterized in that The second preset flow rate is 0.1-2 L / min, and the specified time length is one minute.
9. A PEM electrolytic cell membrane expansion control device, characterized in that: The device comprises: The current control module is used to determine whether the initial current value of the electrolytic cell exceeds the current threshold value when receiving the shutdown command sent by the requester. If yes, the current of the electrolytic cell is slowly reduced to within the current threshold value and then the current of the electrolytic cell is cut off; if no, the current of the electrolytic cell is directly cut off; The hydrogen discharge control module is used to slowly reduce the gas pressure in the cathode chamber to within the gas pressure threshold when the current of the electrolytic cell is cut off, and then slowly pass deionized water into the cathode chamber at a first preset flow rate until it is filled.
10. The device according to claim 9, characterized in that The device also includes: an oxygen exhaust control module, which is used to slowly introduce deionized water into the anode chamber at a second preset flow rate and run for a specified time when the current of the electrolytic cell is cut off.