Shutdown pressure maintaining control method of water electrolysis hydrogen production equipment, product, medium and equipment

Abstract

The invention discloses a shutdown pressure maintaining control method of water electrolysis hydrogen production equipment, a product, a medium and equipment, and relates to the technical field of water electrolysis hydrogen production. The method comprises the steps that after the water electrolysis hydrogen production equipment enters shutdown pressure maintaining control, a hydrogen side pneumatic diaphragm valve, an oxygen side pneumatic diaphragm valve and an oxygen side outlet main valve are closed, and the hydrogen side outlet main valve is opened; the hydrogen-side pneumatic diaphragm valve is controlled to keep the hydrogen-oxygen liquid level difference of the water electrolysis hydrogen production equipment balanced; when the water electrolysis hydrogen production equipment leaks gas, an oxygen side outlet main valve is opened; controlling an oxygen side pneumatic diaphragm valve to regulate and control the pressure of the water electrolysis hydrogen production equipment until the pressure is less than a first preset dwell pressure; carrying out nitrogen filling replacement on the water electrolysis hydrogen production equipment until the pressure of the water electrolysis hydrogen production equipment is greater than a second preset dwell pressure; and the hydrogen side outlet main valve and the oxygen side outlet main valve are closed, and nitrogen filling replacement is stopped. The gas purity of the water electrolysis hydrogen production equipment in the shutdown pressure maintaining process can be effectively maintained, and resource waste and potential safety hazards are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of water electrolysis hydrogen production, and in particular to a shutdown pressure maintenance control method, product, medium and equipment for water electrolysis hydrogen production equipment. Background Art

[0002] The control method of the existing water electrolysis hydrogen production equipment is too simple and cannot meet the frequent start-stop requirements of the green hydrogen project. When the water electrolysis hydrogen production equipment stops working, the shutdown pressure maintenance generally stops the high pressure, stops the electrolyzer from producing gas, and adjusts the liquid level balance after the separation frame reaches the pressure maintenance pressure. After the liquid level is balanced, the main valve of the hydrogen and oxygen gas outlet is closed, and the delayed circulation pump circulates to the pressure maintenance temperature, and then stops the circulation pump. However, as the pressure maintenance time increases, the liquid level difference of the hydrogen and oxygen separation tank will increase significantly. As the liquid level difference increases, the pressure on both sides of the electrolyzer diaphragm is different, resulting in hydrogen and oxygen gas cross-flow in the electrolyzer. After the next electrolyzer is started, the purity of hydrogen and oxygen gas is very poor, making it impossible for the water electrolysis hydrogen production equipment to effectively control the purity of hydrogen and oxygen gas during the shutdown pressure maintenance process, resulting in the need for nitrogen replacement before restarting to ensure that the purity of hydrogen and oxygen gas is qualified and the equipment is safe to operate, which cannot match the real-time nature of green hydrogen production. And if you want to produce gas normally, you need to restart the machine after nitrogen replacement, which increases the time from starting the equipment to the qualified gas purity, and increases the energy consumption during this period. In addition, due to the inability to quickly respond to the gas demand of the back-end process, in order to balance the gas production and consumption of the front and back ends, it is often necessary to increase the volume of the buffer tank, which increases the initial investment in the equipment and adds uncontrollable factors to the safe and stable operation of the overall process.

[0003] In summary, since the existing water electrolysis hydrogen production equipment does not control the liquid level after shutting down for pressure maintenance, the purity of hydrogen and oxygen gases is affected when it is started up next time, resulting in waste of time, energy and other resources and safety hazards. Summary of the invention

[0004] The purpose of this application is to provide a shutdown pressure maintenance control method, product, medium and equipment for water electrolysis hydrogen production equipment, which can effectively maintain the gas purity of water electrolysis hydrogen production equipment during the shutdown pressure maintenance process, avoiding waste of resources and safety hazards.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a shutdown pressure maintenance control method for water electrolysis hydrogen production equipment, comprising:

[0007] After the water electrolysis hydrogen production equipment enters shutdown pressure maintenance control, close the hydrogen side pneumatic diaphragm valve, the oxygen side pneumatic diaphragm valve and the oxygen side outlet main valve, and open the hydrogen side outlet main valve;

[0008] Control the hydrogen-side pneumatic diaphragm valve to keep the hydrogen and oxygen liquid level difference of the water electrolysis hydrogen production equipment balanced;

[0009] When there is leakage in the water electrolysis hydrogen production equipment, open the main valve at the oxygen side outlet;

[0010] Controlling the hydrogen-side pneumatic diaphragm valve to keep the hydrogen-oxygen liquid level difference of the water electrolysis hydrogen production equipment balanced, and simultaneously controlling the oxygen-side pneumatic diaphragm valve to adjust the pressure of the water electrolysis hydrogen production equipment until it is less than or equal to the first preset pressure holding pressure;

[0011] The water electrolysis hydrogen production equipment is filled with nitrogen for replacement until the pressure of the water electrolysis hydrogen production equipment is greater than the second preset pressure holding pressure;

[0012] Close the main valve at the hydrogen side outlet and the main valve at the oxygen side outlet, and stop nitrogen replacement.

[0013] Optionally, the water electrolysis hydrogen production equipment is delayed for 5S before entering shutdown and pressure maintenance control.

[0014] Optionally, the controlling of the hydrogen-side pneumatic membrane valve to keep the hydrogen-oxygen liquid level difference of the water electrolysis hydrogen production equipment balanced specifically includes:

[0015] The hydrogen-side pneumatic diaphragm valve uses PID control to keep the hydrogen and oxygen liquid level difference of the water electrolysis hydrogen production equipment balanced.

[0016] Optionally, when there is a gas leak in the water electrolysis hydrogen production equipment, opening the oxygen side outlet main valve specifically includes:

[0017] When the pressure drop rate of the water electrolysis hydrogen production equipment is greater than 5%, open the oxygen side outlet main valve.

[0018] Optionally, when there is a gas leak in the water electrolysis hydrogen production equipment, opening the oxygen side outlet main valve also includes:

[0019] When the hydrogen and oxygen liquid level difference of the water electrolysis hydrogen production equipment is greater than 80mm, open the main valve at the oxygen side outlet.

[0020] Optionally, the first preset holding pressure is 0.1 MPa; the second preset holding pressure is 0.3 MPa.

[0021] Optionally, the step of filling and replacing the water electrolysis hydrogen production equipment with nitrogen until the pressure of the water electrolysis hydrogen production equipment is greater than a second preset pressure maintaining pressure further comprises:

[0022] The water electrolysis hydrogen production equipment is filled with nitrogen until the pressure of the water electrolysis hydrogen production equipment is greater than the second preset pressure maintenance pressure, and then the gas is evacuated, and the process is repeated three times.

[0023] In a second aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the shutdown and pressure maintenance control method of the water electrolysis hydrogen production equipment.

[0024] In a third aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the shutdown and pressure-maintaining control method for the water electrolysis hydrogen production equipment.

[0025] In a fourth aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the shutdown pressure maintenance control method of the water electrolysis hydrogen production equipment.

[0026] According to the specific embodiments provided in this application, this application has the following technical effects:

[0027] The present application provides a shutdown pressure maintenance control method, product, medium and equipment for water electrolysis hydrogen production equipment. By controlling the hydrogen-side pneumatic diaphragm valve, the hydrogen and oxygen liquid level difference of the water electrolysis hydrogen production equipment is kept balanced during the shutdown pressure maintenance process, thereby maintaining the gas purity of the water electrolysis hydrogen production equipment during the shutdown pressure maintenance process, which is conducive to the qualified purity of hydrogen and oxygen after pressure maintenance, and can indirectly save the nitrogen replacement step required for the next startup due to poor purity, thereby avoiding waste of resources. In addition, the present application also aims at gas leakage by simultaneously controlling the hydrogen-side pneumatic diaphragm valve and the oxygen-side pneumatic diaphragm valve to avoid safety hazards caused by gas leakage. Under normal circumstances, after the shutdown for pressure maintenance, the main valve of the hydrogen and oxygen outlets is closed and there is no regulation. However, the shutdown and pressure maintenance control method, product, medium and equipment of the water electrolysis hydrogen production equipment in the present application increase the control after shutdown and pressure maintenance, so that the liquid level difference in the hydrogen and oxygen separation tank is balanced in real time, solving the problem of decreased purity of hydrogen and oxygen gases caused by unbalanced liquid levels in the hydrogen and oxygen separation tanks during long-term shutdown and pressure maintenance, and the safety hazard caused by gas leakage during shutdown and pressure maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of a shutdown and pressure-maintaining control method for water electrolysis hydrogen production equipment provided in this application;

[0030] Figure 2A schematic diagram of the principle of the shutdown pressure maintenance control method for the water electrolysis hydrogen production equipment provided in this application;

[0031] Figure 3 This is a schematic diagram of the structure of the water electrolysis hydrogen production equipment provided in this application.

[0032] Figure symbols: nitrogen supply main valve—V1, oxygen side nitrogen filling valve—V2, hydrogen side nitrogen filling valve—V3, oxygen side outlet main valve—V4, hydrogen side outlet main valve—V5, oxygen side pneumatic diaphragm valve—PV, hydrogen side pneumatic diaphragm valve—LV, oxygen side check valve—H1, hydrogen side check valve—H2, pressure transmitter—PT, oxygen side differential pressure transmitter—LT1, hydrogen side differential pressure transmitter—LT2, oxygen side separator—1, hydrogen side separator—2, oxygen side gas scrubber—3, hydrogen side gas scrubber—4, oxygen side gas cooler—5, hydrogen side gas cooler—6, oxygen side gas-water separator—7, hydrogen side gas-water separator—8. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] First, the structure of the water electrolysis hydrogen production equipment is as follows Figure 3 As shown, all devices and connection relationships in the figure are existing and will not be discussed in detail here. Through the ideal gas state equation: P1*V1 / T1=P2*V2 / T2, it can be known that during the shutdown and pressure maintenance process of the water electrolysis hydrogen production equipment, the volume of the hydrogen separation tank (hydrogen side separator 2) and the oxygen separation tank (oxygen side separator 1) will not change. Then, as the temperature of the water electrolysis hydrogen production equipment gradually decreases from T1 to T2, the pressure in the separation tank also gradually decreases from P1 to P2. It can be concluded that during the shutdown and pressure maintenance process of the water electrolysis hydrogen production equipment, the pressure of the separation tank is gradually reduced. Therefore, when setting the preset pressure maintenance pressure of the water electrolysis hydrogen production equipment, the preset pressure maintenance pressure must be greater than the actual pressure maintenance pressure, so according to the different pressure maintenance time, the actual pressure required to maintain pressure plus the correction deviation is equal to the preset pressure maintenance pressure.

[0036] Since the specific heat capacities of hydrogen and oxygen are different, the specific heat capacity of hydrogen is 14.30 J / (g·℃), and the specific heat capacity of oxygen is 0.918 J / (g·℃), so the temperature drop rates of hydrogen and oxygen gases are different. The smaller the specific heat capacity, the faster the temperature changes, so the pressure drop rate of the oxygen side separator 1 will be faster than the pressure drop rate of the hydrogen side separator 2, resulting in the liquid level of the oxygen side separator 1 being higher than the liquid level of the hydrogen side separator 2, and as the temperature continues to decrease, the liquid level difference between the two will gradually increase. As the hydrogen and oxygen liquid level difference gradually increases, the pressures on both sides of the electrolyzer diaphragm are different, which will cause the hydrogen and oxygen gases in the alkaline solution on both sides of the diaphragm in the electrolyzer to cross each other, thereby affecting the gas purity in the hydrogen and oxygen separator. In response to this situation, the present application provides a shutdown pressure maintenance control method for water electrolysis hydrogen production equipment to balance the hydrogen and oxygen liquid level difference to avoid the problem of reduced gas purity. The specific process is shown below.

[0037] The shutdown pressure-maintaining control method of the water electrolysis hydrogen production equipment of the present application not only simply closes the main outlet valve when executing the shutdown pressure-maintaining control, but also controls the hydrogen-oxygen liquid level difference by controlling the hydrogen-side pneumatic diaphragm valve LV, so that the hydrogen-oxygen liquid level is always kept in a balanced state. And the single-sided balanced liquid level can effectively keep the pressure of the water electrolysis hydrogen production equipment in a higher range. Therefore, through the shutdown pressure-maintaining control method of the water electrolysis hydrogen production equipment of the present application, the preset pressure-maintaining pressure value is set to 0.3MPa plus the correction deviation, which can make the pressure-maintaining pressure range 0.3-1.8MPa.

[0038] like Figure 1 and Figure 2 As shown, the shutdown pressure maintenance control method of the water electrolysis hydrogen production equipment disclosed in the present application includes:

[0039] Step 1: After the water electrolysis hydrogen production equipment enters the shutdown pressure maintenance control, close the hydrogen side pneumatic diaphragm valve LV, the oxygen side pneumatic diaphragm valve PV and the oxygen side outlet main valve V4, and open the hydrogen side outlet main valve V5.

[0040] Specifically, the present application adds a time delay point for shutdown and pressure maintenance to the original shutdown control, that is, after shutdown and pressure maintenance, it delays for 5S before entering automatic shutdown and pressure maintenance control. After the water electrolysis hydrogen production equipment enters shutdown and pressure maintenance control, the hydrogen side pneumatic diaphragm valve LV and the oxygen side pneumatic diaphragm valve PV are closed, and the hydrogen side outlet main valve V5 is opened. Under normal circumstances, the oxygen side outlet main valve V4 is in a closed state.

[0041] Step 2: Control the hydrogen-side pneumatic diaphragm valve LV to keep the hydrogen-oxygen liquid level difference of the water electrolysis hydrogen production equipment balanced.

[0042] After setting the opening and closing status of the relevant valves, the hydrogen-side pneumatic diaphragm valve LV uses PID control to keep the hydrogen and oxygen liquid level difference of the water electrolysis hydrogen production equipment balanced.

[0043] Step 3: When there is a gas leak in the water electrolysis hydrogen production equipment, open the oxygen side outlet main valve V4.

[0044] Specifically, when a small-scale leakage occurs in the water electrolysis hydrogen production equipment during the shutdown and pressure maintenance process, as long as it is not lower than the lower limit of the pressure maintenance pressure of 0.1MPa, the pneumatic diaphragm valve on the hydrogen and oxygen sides is used for appropriate regulation, alarm prompts, and timely maintenance. When a leak occurs, such as a leak in the hydrogen side pipeline, the hydrogen side pressure decreases and the liquid level increases. The liquid level balance is adjusted by adjusting the pneumatic diaphragm valve PV on the oxygen side. Conversely, when a leak occurs in the oxygen side pipeline, the liquid level balance is adjusted by adjusting the pneumatic diaphragm valve LV on the hydrogen side. The alarm can clearly reflect the leakage of the hydrogen side or oxygen side pipeline through the size and polarity of the hydrogen and oxygen liquid level difference, and the upper computer monitoring software will display the real-time alarm and buzzer prompt.

[0045] However, when a large-scale leakage occurs in the water electrolysis hydrogen production equipment during the shutdown and pressure maintenance process, that is, when the pressure drop rate of the water electrolysis hydrogen production equipment is greater than 5% or the hydrogen and oxygen liquid level difference of the water electrolysis hydrogen production equipment is greater than 80mm, the alarm is immediately triggered and the oxygen side outlet main valve V4 is opened.

[0046] The main valve at the hydrogen and oxygen side outlet is opened, the pneumatic diaphragm valve at the hydrogen and oxygen side is regulated, and the three-way valve is adjusted to the empty state for exhaust. When the system pressure drops to 0.1MPa, nitrogen is automatically filled.

[0047] Step 4: Control the hydrogen-side pneumatic diaphragm valve LV to keep the hydrogen-oxygen liquid level difference of the water electrolysis hydrogen production equipment balanced, and simultaneously control the oxygen-side pneumatic diaphragm valve PV to adjust the pressure of the water electrolysis hydrogen production equipment until it is less than or equal to the first preset pressure holding pressure.

[0048] After a large-scale gas leakage occurs in the water electrolysis hydrogen production equipment, the main valves at the hydrogen and oxygen side outlets are both in the open state. At the same time, the hydrogen side pneumatic diaphragm valve LV and the oxygen side pneumatic diaphragm valve PV are controlled by PID regulation, so as to ensure the hydrogen and oxygen liquid level difference balance of the water electrolysis hydrogen production equipment while controlling the pressure of the water electrolysis hydrogen production equipment until it is less than the first preset pressure holding pressure of 0.1MPa.

[0049] Step 5: The water electrolysis hydrogen production equipment is filled with nitrogen until the pressure of the water electrolysis hydrogen production equipment is greater than the second preset pressure holding pressure. The second preset pressure holding pressure is 0.3 MPa.

[0050] Specifically, in combination with step 3 and step 4, it can be known that during the shutdown and pressure maintenance process, if there is a leak in the front-end pipeline of the oxygen-side pneumatic diaphragm valve PV, the oxygen-side pressure will drop extremely. When the pressure drop rate detected by the pressure transmitter PT is higher than the normal drop rate (5%), the water electrolysis hydrogen production equipment is controlled to alarm, the hydrogen and oxygen side outlet main valve is opened, and the hydrogen side three-way valve is cut in to empty. At this time, the first preset pressure maintenance pressure of the water electrolysis hydrogen production equipment is set to 0.1MPa, the shutdown and pressure maintenance program is terminated, and the normal shutdown program is cut in. The hydrogen-side pneumatic diaphragm valve LV controls the hydrogen-oxygen liquid level difference through the liquid level control PID, and the oxygen-side pneumatic diaphragm valve PV controls the pressure through the pressure control PID until the pressure is less than or equal to 0.1MPa, and then the automatic nitrogen filling replacement control is cut in.

[0051] During the shutdown and pressure maintenance process, if there is a gas leak in the front-end pipeline of the hydrogen side pneumatic diaphragm valve LV, the liquid level in the hydrogen side separation tank will be higher than that in the oxygen side separation tank. When the hydrogen-oxygen liquid level difference is greater than 80mm, the normal shutdown procedure will be entered. The hydrogen side pneumatic diaphragm valve LV controls the hydrogen-oxygen liquid level difference through the liquid level control PID, and the oxygen side pneumatic diaphragm valve PV controls the pressure through the pressure control PID. When the pressure is less than or equal to 0.1MPa, the automatic nitrogen filling and replacement procedure will be entered.

[0052] Step 6: Close the hydrogen side outlet main valve V5 and the oxygen side outlet main valve V4, and stop nitrogen replacement.

[0053] After nitrogen filling, when the pressure reaches the second preset pressure holding pressure of 0.3MPa, the gas is evacuated and the process is repeated three times. Finally, after nitrogen is filled to a pressure of 0.3MPa, the main valve at the hydrogen and oxygen side outlet is closed and maintenance is awaited.

[0054] Compared with the existing related technologies, the shutdown pressure maintenance control method of the water electrolysis hydrogen production equipment in this application can achieve the following effects:

[0055] 1. It can solve the problem of decreased purity of hydrogen and oxygen gases caused by the imbalance of liquid levels in the hydrogen and oxygen separation tanks when the water electrolysis hydrogen production equipment is shut down for a long time to maintain pressure.

[0056] 2. It can solve the problem that the water electrolysis hydrogen production equipment needs to be replaced with nitrogen again after being shut down for a long time to maintain pressure.

[0057] 3. It can solve the problem that it takes too long for the water electrolysis hydrogen production equipment to be restarted after a long period of shutdown to maintain pressure until the gas purity is qualified.

[0058] 4. It can solve the problem of large volume caused by the rapid response to the back-end process gas demand after the water electrolysis hydrogen production equipment is shut down for a long time to maintain pressure.

[0059] 5. It can solve the potential safety hazard of equipment caused by impure hydrogen and oxygen gas after the water electrolysis hydrogen production equipment is shut down for a long time to maintain pressure.

[0060] 6. It can solve the potential safety hazard of equipment caused by long-term shutdown of water electrolysis hydrogen production equipment to maintain pressure and leak.

[0061] The shutdown and pressure maintenance control automatically executed by the present application can control the liquid level balance of the hydrogen-oxygen separator of the hydrogen production equipment during the shutdown and pressure maintenance process to a great extent, ensure that the purity of the hydrogen and oxygen gases during the shutdown and pressure maintenance process will not be reduced due to the problem of liquid level balance, and effectively prevent the safety hazards caused by uncontrollable factors such as leakage during the shutdown and pressure maintenance process. In the case of no one on duty, safety measures are automatically taken to minimize the risks during the shutdown and pressure maintenance process of the hydrogen production equipment, and nitrogen replacement is not required when the equipment is started next time, saving the time / electricity cost / nitrogen consumption and other costs of nitrogen replacement caused by unqualified purity at the next startup.

[0062] To sum up, the shutdown and pressure maintenance control method of the water electrolysis hydrogen production equipment of the present application can effectively improve the safety of the water electrolysis hydrogen production equipment during the shutdown and pressure maintenance process, provide full-time period control, and avoid equipment safety hazards when accidental leakage of hydrogen and oxygen gases occurs during the pressure maintenance process. The shutdown and pressure maintenance control method of the water electrolysis hydrogen production equipment of the present application is automatically executed by the control program in the controller, without the need for human participation, and is safer and more reliable. In the event of dangerous situations, such as accidental situations such as equipment leakage, there can be alarm prompts and automatic dangerous emergency operations.

[0063] In some embodiments, the present application also provides a computer program product, including a computer program, which, when executed by a processor, implements the shutdown and pressure maintenance control method of the water electrolysis hydrogen production equipment.

[0064] In some embodiments, the present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the shutdown and pressure-maintaining control method for the water electrolysis hydrogen production equipment.

[0065] In some embodiments, the present application also provides a computer device, including a processor, a memory, an input / output interface (Input / Output, referred to as I / O), a communication interface, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the shutdown and pressure maintaining control method of the water electrolysis hydrogen production equipment.

[0066] Wherein, the processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Wherein, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store pending transactions. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the shutdown and pressure maintenance control method of the water electrolysis hydrogen production equipment is implemented.

[0067] It should be noted that the object information (including but not limited to object device information, object personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the object or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards.

[0068] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ReadOnlyMemory, ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0069] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A shutdown and pressure maintenance control method for water electrolysis hydrogen production equipment, characterized in that: include: After the water electrolysis hydrogen production equipment enters shutdown pressure maintenance control, close the hydrogen side pneumatic diaphragm valve, the oxygen side pneumatic diaphragm valve and the oxygen side outlet main valve, and open the hydrogen side outlet main valve; Control the hydrogen-side pneumatic diaphragm valve to keep the hydrogen and oxygen liquid level difference of the water electrolysis hydrogen production equipment balanced; When there is leakage in the water electrolysis hydrogen production equipment, open the main valve at the oxygen side outlet; Controlling the hydrogen-side pneumatic diaphragm valve to keep the hydrogen-oxygen liquid level difference of the water electrolysis hydrogen production equipment balanced, and simultaneously controlling the oxygen-side pneumatic diaphragm valve to adjust the pressure of the water electrolysis hydrogen production equipment until it is less than or equal to the first preset pressure holding pressure; The water electrolysis hydrogen production equipment is filled with nitrogen for replacement until the pressure of the water electrolysis hydrogen production equipment is greater than the second preset pressure holding pressure; Close the main valve at the hydrogen side outlet and the main valve at the oxygen side outlet, and stop nitrogen replacement.

2. The shutdown and pressure maintenance control method for water electrolysis hydrogen production equipment according to claim 1, characterized in that: The water electrolysis hydrogen production equipment is delayed for 5S before entering shutdown and pressure maintenance control.

3. The shutdown and pressure maintenance control method for water electrolysis hydrogen production equipment according to claim 1, characterized in that: The method of controlling the hydrogen-side pneumatic membrane valve to keep the hydrogen and oxygen liquid level difference of the water electrolysis hydrogen production equipment balanced specifically includes: The hydrogen-side pneumatic diaphragm valve uses PID control to keep the hydrogen and oxygen liquid level difference of the water electrolysis hydrogen production equipment balanced.

4. The shutdown and pressure maintenance control method for water electrolysis hydrogen production equipment according to claim 1, characterized in that: When there is a gas leak in the water electrolysis hydrogen production equipment, the main valve at the oxygen side outlet is opened, which specifically includes: When the pressure drop rate of the water electrolysis hydrogen production equipment is greater than 5%, open the oxygen side outlet main valve.

5. The shutdown and pressure maintenance control method for water electrolysis hydrogen production equipment according to claim 1, characterized in that: When the water electrolysis hydrogen production equipment has a gas leak, opening the oxygen side outlet main valve also includes: When the hydrogen and oxygen liquid level difference of the water electrolysis hydrogen production equipment is greater than 80mm, open the main valve at the oxygen side outlet.

6. The shutdown and pressure maintenance control method for water electrolysis hydrogen production equipment according to claim 1, characterized in that: The first preset holding pressure is 0.1 MPa; the second preset holding pressure is 0.3 MPa.

7. The shutdown and pressure maintenance control method for water electrolysis hydrogen production equipment according to claim 1, characterized in that: The step of filling and replacing the water electrolysis hydrogen production equipment with nitrogen until the pressure of the water electrolysis hydrogen production equipment is greater than a second preset pressure maintaining pressure also includes: The water electrolysis hydrogen production equipment is filled with nitrogen until the pressure of the water electrolysis hydrogen production equipment is greater than the second preset pressure maintenance pressure, and then the gas is evacuated, and the process is repeated three times.

8. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the shutdown and pressure maintenance control method of the water electrolysis hydrogen production equipment described in any one of claims 1-7 is implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the shutdown and pressure maintenance control method of the water electrolysis hydrogen production equipment described in any one of claims 1-7 is implemented.

10. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the shutdown pressure maintenance control method for the water electrolysis hydrogen production equipment described in any one of claims 1-7.

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