Alkaline water electrolysis hydrogen production equipment liquid level control system, method, equipment and medium

Abstract

The embodiment of the invention provides a liquid level control system, method and equipment for alkaline water electrolysis hydrogen production equipment and a medium, and belongs to the field of water electrolysis hydrogen production. The system comprises a central monitoring system, a hydrogen production system controller, a differential pressure transmitter, a pollution discharge pressure guide system and a plurality of intermediate relays, wherein the power distribution of the differential pressure transmitter is connected with the differential pressure transmitter through the first intermediate relay; the hydrogen production system controller is used for detecting the working states of the first intermediate relay, the second intermediate relay and the third intermediate relay and judging the working state of each device according to the detection result; and the central monitoring system is used for remotely controlling the power transmission state of the differential pressure transmitter and the working state of the pollution discharge pressure guide system. The system can automatically identify the liquid accumulation condition of the gas phase pressure guide loop, realizes automatic liquid discharge according to the liquid accumulation condition, realizes unmanned management of pressure guide pipe type liquid level measurement, greatly reduces the maintenance workload of field staff, and has the advantages of simple design structure, higher cost performance and very wide application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production by water electrolysis, and in particular to a liquid level control system, method, equipment and medium for alkaline water electrolysis hydrogen production equipment. Background Art

[0002] As a clean and efficient secondary energy source, hydrogen energy has the characteristics of high calorific value, wide sources and environmental friendliness. It is considered to be an important energy form for future energy transformation and achieving the "dual carbon" goal. The development of the hydrogen energy industry is of great significance to promoting the transformation of the global energy structure to a cleaner, more efficient and sustainable one. In the electrolysis of water hydrogen production industry, alkaline water electrolysis has become the main hydrogen production technology route due to its high product purity, mature and simple equipment, convenient operation and low investment. The alkaline water electrolysis hydrogen production system mainly includes a rectifier power supply system, an electrolyzer system, a separation system and a purification system. The liquid level measurement parameters are key parameters for the liquid level control of the separation system and even the stability control of the entire system, which are particularly important for the hydrogen production system.

[0003] The existing alkaline water electrolysis hydrogen production equipment liquid level measurement mostly uses differential pressure transmitters in the form of pressure pipes. During the normal operation of the hydrogen production equipment, affected by factors such as ambient temperature, alkali liquid will accumulate in the gas phase pressure pipe of the liquid level control system. Therefore, the operation and maintenance personnel need to frequently check and manually drain the liquid during the inspection. In addition, due to unreasonable design, such as: the drainage point is not at the lowest point, etc., the accumulated liquid may not be manually drained. The accumulation of alkali liquid will cause errors in the measurement of the differential pressure transmitter, which will affect the liquid level control and the smooth operation of the entire system. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a liquid level control system, method, equipment and medium for alkaline water electrolysis hydrogen production equipment, which are used to completely or at least partially solve the technical problems existing in the above-mentioned prior art.

[0005] In order to achieve the above-mentioned object, an embodiment of the present invention provides a liquid level control system for an alkaline water electrolysis hydrogen production equipment, comprising: a central monitoring system, a hydrogen production system controller, a differential pressure transmitter, a sewage discharge pressure guiding system, and a plurality of intermediate relays arranged in a hydrogen production system PLC control cabinet; The power distribution of the differential pressure transmitter is connected to the differential pressure transmitter through the first intermediate relay among the multiple intermediate relays. The differential pressure transmitter is used to collect the liquid level signal and is connected to the hydrogen production system controller through the safety isolation module of the hydrogen production system PLC control cabinet. The sewage discharge pressure guiding system includes a liquid phase pressure guiding pipe, a gas phase pressure guiding pipe, a gas-liquid separator, a gas-liquid separator liquid level gauge and an explosion-proof solenoid valve, wherein the gas phase pressure guiding pipe and the liquid phase pressure guiding pipe are respectively connected to the differential pressure transmitter interface on the hydrogen and oxygen sides after being led out from the hydrogen and oxygen separator, the power distribution of the gas-liquid separator liquid level gauge and the explosion-proof solenoid valve are respectively connected to the second and third intermediate relays, and the liquid level signal of the gas-liquid separator liquid level gauge is connected to the hydrogen production system controller through the safety isolation module of the PLC control cabinet; The hydrogen production system controller is used to detect the working status of the first intermediate relay, the second intermediate relay and the third intermediate relay connected to the differential pressure transmitter, the explosion-proof solenoid valve and the gas-liquid separator level gauge, and judge the working status of the differential pressure transmitter, the explosion-proof solenoid valve and the gas-liquid separator level gauge according to the detection results of the first, second and third intermediate relays and send them to the central monitoring system; The central monitoring system is used to receive the working status of the differential pressure transmitter and the sewage pressure guiding system, and remotely control the power supply status of the differential pressure transmitter and the working status of the sewage pressure guiding system through the hydrogen production system controller; A plurality of intermediate relays are respectively connected to the hydrogen production system controller.

[0006] Optionally, the power distribution of the differential pressure transmitter, gas-liquid separator level gauge and explosion-proof solenoid valve is respectively connected to the first contacts of the first, second and third intermediate relays corresponding to the differential pressure transmitter, gas-liquid separator level gauge and explosion-proof solenoid valve, and the second contacts of the first, second and third intermediate relays are respectively connected to the differential pressure transmitter, gas-liquid separator level gauge and explosion-proof solenoid valve.

[0007] Optionally, the central monitoring system is used to send instructions to the hydrogen production system controller according to the liquid level status of the gas-liquid separator, so as to remotely control the working status of the explosion-proof solenoid valve to achieve the emptying of the alkaline liquid accumulated in the gas-liquid separator.

[0008] Optionally, when the central monitoring system sends an instruction to the hydrogen production system controller to respectively control the first contact and the third contact of the first intermediate relay connected to the differential pressure transmitter and the second intermediate relay connected to the gas-liquid separator level gauge to close, the differential pressure transmitter and the gas-liquid separator level gauge are powered on, and the alkaline water electrolysis hydrogen production equipment liquid level control system is in a liquid level monitoring state; When the first contact and the third contact of the third intermediate relay connected to the explosion-proof solenoid valve are closed, the explosion-proof solenoid valve is energized and actuated, and the liquid level control system of the alkaline water electrolysis hydrogen production equipment is in a liquid discharge state.

[0009] Optionally, when the central monitoring system sends an instruction to the hydrogen production system controller to control the first contact and the second contact of the first intermediate relay connected to the differential pressure transmitter and the second intermediate relay connected to the gas-liquid separator level gauge to close, the power supply circuit of the differential pressure transmitter and the gas-liquid separator level gauge is disconnected, and the differential pressure transmitter and the gas-liquid separator level gauge are in an offline state; When the first contact and the second contact of the third intermediate relay connected to the explosion-proof solenoid valve are closed, the power supply circuit of the explosion-proof solenoid valve is disconnected, and the liquid level control system of the alkaline water electrolysis hydrogen production equipment is in a liquid storage state.

[0010] Optionally, the liquid level signals collected by the differential pressure transmitter and the gas-liquid separator level meter are both 4-20mA current signals.

[0011] Optionally, the gas phase pressure conducting pipe passes through a gas-liquid separator after being led out, wherein the gas-liquid separator is installed at the lowest point of the gas phase pressure conducting system to ensure that the accumulated liquid is completely drained.

[0012] On the other hand, the present invention also provides a liquid level control method for alkaline water electrolysis hydrogen production equipment applied to a liquid level control system of an alkaline water electrolysis hydrogen production equipment, comprising: According to the working status feedback of the hydrogen production system, the central monitoring system sends instructions to the hydrogen production system controller to control the operation of the relay contacts, thereby controlling the working status of the differential pressure transmitter, the gas-liquid separator level gauge and the solenoid valve; When the central monitoring system sends instructions to the hydrogen production system controller, and controls the first and third contacts of the first and second intermediate relays to close respectively, the differential pressure transmitter and the gas-liquid separator level gauge are powered on, and the alkaline water electrolysis hydrogen production equipment liquid level measurement and control system is in the liquid level monitoring state; when the first and third contacts of the third intermediate relay are controlled to close, the explosion-proof solenoid valve is powered on, and the alkaline water electrolysis hydrogen production equipment liquid level measurement and control system is in the liquid discharge state; When the central monitoring system sends instructions to the hydrogen production system controller to control the first and second contacts of the corresponding first and second intermediate relays to close, the power supply circuits of the differential pressure transmitter and the gas-liquid separator level gauge are disconnected and are in an offline state; when the first and second contacts of the third intermediate relay are controlled to close, the power supply circuit of the explosion-proof solenoid valve is disconnected, and the liquid level measurement and control system of the alkaline water electrolysis hydrogen production equipment is in a liquid storage state.

[0013] On the other hand, the present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the liquid level measurement control method for the alkaline water electrolysis hydrogen production equipment as described in claim 8 are implemented.

[0014] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the liquid level measurement control method for alkaline water electrolysis hydrogen production equipment as described in claim 8.

[0015] Through the above technical scheme, the liquid level control system of the alkaline water electrolysis hydrogen production equipment can automatically identify the liquid accumulation in the gas phase pressure conducting circuit, and automatically drain the liquid according to the liquid accumulation situation, thereby realizing unmanned management of the liquid level measurement in the form of the pressure conducting pipe, greatly reducing the maintenance workload of on-site staff, and its design structure is simple, cost-effective, and has a very broad application prospect.

[0016] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 It is a structural schematic diagram of a liquid level control system of an alkaline water electrolysis hydrogen production equipment provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of a liquid level control system for an alkaline water electrolysis hydrogen production equipment provided by an embodiment of the present invention; Figure 3 It is an implementation flow chart of a liquid level control method for alkaline water electrolysis hydrogen production equipment applied to a liquid level control system of alkaline water electrolysis hydrogen production equipment provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The liquid level control system of the existing alkaline water electrolysis hydrogen production system mostly adopts the double flange differential pressure transmitter system and the pressure pipe differential pressure transmitter system. Both control systems calculate the liquid level of the container based on the pressure difference principle. Among them, the double flange differential pressure transmitter is easy to install and easy to maintain in the later stage, but it also has disadvantages such as high price and complex debugging. Although the pressure pipe differential pressure transmitter has the disadvantages of liquid accumulation in the pressure pipe during long-term operation, causing measurement errors and relatively complex later maintenance, it is cheap, economical, and relatively simple to debug, so it has a large market scale and wide application.

[0019] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0020] See also Figure 1As shown, it is a structural schematic diagram of a liquid level control system of an alkaline water electrolysis hydrogen production equipment provided by an embodiment of the present invention, including: a central monitoring system 1, a hydrogen production system controller 2, a differential pressure transmitter 3, a sewage pressure guiding system ( Figure 1 (not shown) and multiple intermediate relays (intermediate relay No. 1, intermediate relay No. 2, intermediate relay No. 3) arranged in the PLC control cabinet of the hydrogen production system; The power distribution of the differential pressure transmitter is connected to the differential pressure transmitter 5 through the first intermediate relay 4 (i.e., intermediate relay No. 1) among multiple intermediate relays. The differential pressure transmitter 5 is used to collect liquid level signals and is connected to the hydrogen production system controller 2 through the safety isolation module of the hydrogen production system PLC control cabinet. The sewage discharge pressure guiding system includes a liquid phase pressure guiding pipe (not shown in the figure), a gas phase pressure guiding pipe (not shown in the figure), a gas-liquid separator (not shown in the figure), a gas-liquid separator level gauge 8 and an explosion-proof solenoid valve 11, wherein the gas phase pressure guiding pipe and the liquid phase pressure guiding pipe are respectively connected to the differential pressure transmitter interface on the hydrogen and oxygen side after being led out from the hydrogen and oxygen separator, and the power distribution of the gas-liquid separator level gauge 8 and the explosion-proof solenoid valve 11 (i.e., the gas-liquid separator level gauge power distribution 6 and the explosion-proof solenoid valve power distribution 9) are respectively connected to the second and third intermediate relays, and the liquid level signal of the gas-liquid separator level gauge 8 is connected to the hydrogen production system controller 2 through the safety isolation module of the PLC control cabinet; The hydrogen production system controller 2 is used to detect the working status of the first intermediate relay 4, the second intermediate relay 7 (i.e., No. 2 intermediate relay) and the third intermediate relay 10 (i.e., No. 3 intermediate relay) connected to the differential pressure transmitter 5, the explosion-proof solenoid valve 11 and the gas-liquid separator level gauge 8, and judge the working status of the differential pressure transmitter 5, the explosion-proof solenoid valve 11 and the gas-liquid separator level gauge 8 according to the detection results of the first, second and third intermediate relays and send them to the central monitoring system 1; The central monitoring system 1 is used to receive the working status of the differential pressure transmitter 5 and the sewage pressure system, and remotely control the power supply status of the differential pressure transmitter 5 and the working status of the sewage pressure system through the hydrogen production system controller 2; A plurality of intermediate relays are respectively connected to the hydrogen production system controller 2 .

[0021] Specifically, the power distribution of the differential pressure transmitter 5, the gas-liquid separator level gauge 8 and the explosion-proof solenoid valve 11 are respectively connected to the first contacts of the first, second and third intermediate relays corresponding to the differential pressure transmitter 5, the gas-liquid separator level gauge 8 and the explosion-proof solenoid valve 11, and the second contacts of the first, second and third intermediate relays are respectively connected to the differential pressure transmitter 5, the gas-liquid separator level gauge 8 and the explosion-proof solenoid valve 11.

[0022] In some embodiments, the central monitoring system 1 is used to send instructions to the hydrogen production system controller 2 according to the liquid level state of the gas-liquid separator to remotely control the working state of the explosion-proof solenoid valve 11 to achieve the emptying of the alkaline liquid accumulated in the gas-liquid separator.

[0023] In some embodiments, when the central monitoring system 1 sends an instruction to the hydrogen production system controller 2, and respectively controls the first contact and the third contact of the first intermediate relay 4 connected to the differential pressure transmitter 5 and the second intermediate relay 7 connected to the gas-liquid separator level gauge 8 to be closed, the differential pressure transmitter 5 and the gas-liquid separator level gauge 8 are energized to work, and the liquid level control system of the alkaline water electrolysis hydrogen production equipment is in a liquid level monitoring state; when the first contact and the third contact of the third intermediate relay 10 connected to the explosion-proof solenoid valve 11 are closed, the explosion-proof solenoid valve 11 is energized to operate, and the liquid level control system of the alkaline water electrolysis hydrogen production equipment is in a liquid discharge state.

[0024] In some embodiments, when the central monitoring system 1 sends an instruction to the hydrogen production system controller 2 to control the first contact and the second contact of the first intermediate relay 4 connected to the differential pressure transmitter 5 and the second intermediate relay 7 connected to the gas-liquid separator level gauge 8 to close, the power supply circuit of the differential pressure transmitter 5 and the gas-liquid separator level gauge 8 is disconnected, and the differential pressure transmitter 5 and the gas-liquid separator level gauge 8 are in an offline state; when the first contact and the second contact of the third intermediate relay 10 connected to the explosion-proof solenoid valve 11 are closed, the power supply circuit of the explosion-proof solenoid valve 11 is disconnected, and the liquid level control system of the alkaline water electrolysis hydrogen production equipment is in a liquid storage state.

[0025] The control device of the hydrogen production system is used to detect and control the status of each sub-equipment of the intelligent liquid level control system, and the working status of each sub-equipment is remotely and intelligently controlled, so as to achieve the switching of the fully intelligent liquid level control system. The intelligent liquid drainage and pressure guiding system can automatically drain the liquid according to the accumulation of liquid, and while improving the accuracy of liquid level measurement, it truly realizes the unmanned management of liquid level measurement in the form of pressure guiding pipes, greatly reducing the maintenance workload on site. It further realizes the intelligent control of the lighting system of the wind turbine.

[0026] Preferably, the liquid level signals collected by the differential pressure transmitter 5 and the gas-liquid separator level meter 8 are both 4-20 mA current signals.

[0027] In some embodiments, the gas-phase pressure conducting pipe passes through a gas-liquid separator after being led out, wherein the gas-liquid separator is installed at the lowest point of the gas-phase pressure conducting system to ensure that the accumulated liquid is completely drained.

[0028] See also Figure 2As shown, an embodiment of the present invention provides a schematic diagram of a liquid level control system for an alkaline water electrolysis hydrogen production device, in which the positive and negative terminals 24V+ and 24V- of a 24V DC power supply are respectively connected to the intermediate relay 4, the intermediate relay 7, and the 11 terminal of the intermediate relay 10. The intermediate relay 4, the intermediate relay 7, and the 14 terminal of the intermediate relay 10 are respectively connected to the power supply terminals 24V+ and 24V- of the differential pressure transmitter 5, the gas-liquid separator level gauge 8, and the explosion-proof solenoid valve 11 controlled by them.

[0029] When the central monitoring system 1 of the control room determines that the differential pressure transmitter 5 needs to be operated, it will control the hydrogen production system controller 2 to issue an operation instruction, and the hydrogen production system controller 2 controls the 11th and 14th terminals of the intermediate relay 4 to be closed. At this time, the power distribution circuit is connected, and the differential pressure transmitter 5 is powered to operate. Otherwise, the 11th and 12th terminals are closed, the power distribution circuit is cut off, and the differential pressure transmitter 5 loses power.

[0030] When the central monitoring system 1 of the control room determines that the gas-liquid separator level meter 8 needs to be operated, it will control the hydrogen production system controller 2 to issue an operation instruction, and the hydrogen production system controller 2 controls the 11th and 14th terminals of the intermediate relay 7 to close. At this time, the power distribution circuit is connected, and the gas-liquid separator level meter 8 is powered and operated. Otherwise, the 11th and 12th terminals are cut off, the power distribution circuit is disconnected, and the gas-liquid separator level meter 8 loses power.

[0031] When the hydrogen production system controller 2 collects the liquid level information through the gas-liquid separator level meter 8, the information is fed back to the central monitoring system 1. The central monitoring system 1 determines that if the liquid level is too high, it will issue a command through the hydrogen production system controller 2 to control the closure of terminals 11 and 14 of the intermediate relay 10. At this time, the power distribution circuit is connected, and the explosion-proof solenoid valve 11 is energized and in an open state, and is in a liquid discharge state; when the liquid level is emptied, terminals 11 and 12 of the intermediate relay 10 are closed, the power distribution circuit is cut off, and the explosion-proof solenoid valve 11 loses power and switches to a closed state, and the liquid discharge is completed.

[0032] As a preferred embodiment of the technical solution of the present application, the system further includes a centralized control center, and the central monitoring system is arranged in the centralized control center.

[0033] As a preferred embodiment of the technical solution of the present application, the central monitoring system 1 communicates with the hydrogen production system controller 2 to collect the working status of each device in the liquid level control system and displays it on the interface of the central monitoring system; according to the liquid level status of the gas-liquid separator, the central monitoring system 1 sends instructions to the hydrogen production system controller 2, thereby achieving the purpose of remotely controlling the working status of the explosion-proof solenoid valve 11, and then draining the alkaline liquid accumulated in the gas-liquid separator.

[0034] It can be seen from the above technical solutions that this application has the following advantages: this intelligent liquid level control system can be intelligently switched, and can also be remotely manually controlled to realize multiple control concepts, which can meet the needs of various working conditions; this intelligent liquid level control system can automatically identify the accumulation of liquid in the gas phase pressure circuit through the intelligent drainage and pressure guiding system, and realize automatic drainage according to the accumulation of liquid, realize unmanned management of pressure guiding pipe liquid level measurement, and greatly reduce the maintenance workload of on-site staff; this system is cheaper and more cost-effective than the double flange differential pressure transmitter measurement method. In addition, the design principle of this application is reliable, the structure is simple, the cost-effectiveness is higher, and it has a very broad application prospect.

[0035] See also Figure 3 As shown, it is an implementation flow chart of an alkaline water electrolysis hydrogen production equipment liquid level control method applied to an alkaline water electrolysis hydrogen production equipment liquid level control system provided by an embodiment of the present invention, comprising the following execution steps: Step 300: Based on the working status feedback of the hydrogen production system, the central monitoring system sends instructions to the hydrogen production system controller to control the operation of the relay contacts, thereby controlling the working status of the differential pressure transmitter, the gas-liquid separator level gauge and the solenoid valve; Step 301: When the central monitoring system sends an instruction to the hydrogen production system controller to control the first contact and the third contact of the first and second intermediate relays to close respectively, the differential pressure transmitter and the gas-liquid separator liquid level gauge are powered on and work, and the alkaline water electrolysis hydrogen production equipment liquid level measurement and control system is in a liquid level monitoring state; when the first contact and the third contact of the third intermediate relay are controlled to close, the explosion-proof solenoid valve is powered on and actuated, and the alkaline water electrolysis hydrogen production equipment liquid level measurement and control system is in a liquid discharge state; Step 302: When the central monitoring system sends an instruction to the hydrogen production system controller to control the first and second contacts of the corresponding first and second intermediate relays to close, the power supply circuits of the differential pressure transmitter and the gas-liquid separator level gauge are disconnected and are in an offline state; when the first and second contacts of the third intermediate relay are controlled to close, the power supply circuit of the explosion-proof solenoid valve is disconnected, and the liquid level measurement control system of the alkaline water electrolysis hydrogen production equipment is in a liquid storage state.

[0036] On the other hand, the present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned method for controlling the liquid level of the alkaline water electrolysis hydrogen production equipment when executing the program.

[0037] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the above-mentioned liquid level measurement control method for alkaline water electrolysis hydrogen production equipment are implemented.

[0038] 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 combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0039] 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.

[0040] 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 1 A function specified in one or more boxes.

[0041] 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 The steps for the functions specified in one or more boxes.

[0042] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0043] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0044] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0045] 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.

[0046] 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.

Claims

1. A liquid level control system for alkaline water electrolysis hydrogen production equipment, characterized in that: include: Central monitoring system, hydrogen production system controller, differential pressure transmitter, sewage discharge pressure guiding system and multiple intermediate relays installed in the hydrogen production system PLC control cabinet; The power distribution of the differential pressure transmitter is connected to the differential pressure transmitter through the first intermediate relay among the multiple intermediate relays. The differential pressure transmitter is used to collect the liquid level signal and is connected to the hydrogen production system controller through the safety isolation module of the hydrogen production system PLC control cabinet. The sewage discharge pressure guiding system includes a liquid phase pressure guiding pipe, a gas phase pressure guiding pipe, a gas-liquid separator, a gas-liquid separator liquid level gauge and an explosion-proof solenoid valve, wherein the gas phase pressure guiding pipe and the liquid phase pressure guiding pipe are respectively connected to the differential pressure transmitter interface on the hydrogen and oxygen sides after being led out from the hydrogen and oxygen separator, the power distribution of the gas-liquid separator liquid level gauge and the explosion-proof solenoid valve are respectively connected to the second and third intermediate relays, and the liquid level signal of the gas-liquid separator liquid level gauge is connected to the hydrogen production system controller through the safety isolation module of the PLC control cabinet; The hydrogen production system controller is used to detect the working status of the first intermediate relay, the second intermediate relay and the third intermediate relay connected to the differential pressure transmitter, the explosion-proof solenoid valve and the gas-liquid separator level gauge, and judge the working status of the differential pressure transmitter, the explosion-proof solenoid valve and the gas-liquid separator level gauge according to the detection results of the first, second and third intermediate relays and send them to the central monitoring system; The central monitoring system is used to receive the working status of the differential pressure transmitter and the sewage pressure guiding system, and remotely control the power supply status of the differential pressure transmitter and the working status of the sewage pressure guiding system through the hydrogen production system controller; A plurality of intermediate relays are respectively connected to the hydrogen production system controller.

2. The liquid level control system of the alkaline water electrolysis hydrogen production equipment according to claim 1, characterized in that: The power distribution of the differential pressure transmitter, the gas-liquid separator level gauge and the explosion-proof solenoid valve is respectively connected to the first contacts of the first, second and third intermediate relays corresponding to the differential pressure transmitter, the gas-liquid separator level gauge and the explosion-proof solenoid valve, and the second contacts of the first, second and third intermediate relays are respectively connected to the differential pressure transmitter, the gas-liquid separator level gauge and the explosion-proof solenoid valve.

3. The liquid level control system for alkaline water electrolysis hydrogen production equipment according to claim 1 or 2, characterized in that: The central monitoring system is used to send instructions to the hydrogen production system controller according to the liquid level state of the gas-liquid separator, so as to remotely control the working state of the explosion-proof solenoid valve and realize the emptying of the alkaline liquid accumulated in the gas-liquid separator.

4. The liquid level control system of the alkaline water electrolysis hydrogen production equipment according to claim 2, characterized in that: When the central monitoring system sends instructions to the hydrogen production system controller to control the first contact and the third contact of the first intermediate relay connected to the differential pressure transmitter and the second intermediate relay connected to the gas-liquid separator level gauge to close, the differential pressure transmitter and the gas-liquid separator level gauge are powered on, and the alkaline water electrolysis hydrogen production equipment liquid level control system is in a liquid level monitoring state; When the first contact and the third contact of the third intermediate relay connected to the explosion-proof solenoid valve are closed, the explosion-proof solenoid valve is energized and actuated, and the liquid level control system of the alkaline water electrolysis hydrogen production equipment is in a liquid discharge state.

5. The liquid level control system of the alkaline water electrolysis hydrogen production equipment according to claim 2, characterized in that: When the central monitoring system sends an instruction to the hydrogen production system controller to control the first contact and the second contact of the first intermediate relay connected to the differential pressure transmitter and the second intermediate relay connected to the gas-liquid separator level gauge to close, the power supply circuit of the differential pressure transmitter and the gas-liquid separator level gauge is disconnected, and the differential pressure transmitter and the gas-liquid separator level gauge are in an offline state; When the first contact and the second contact of the third intermediate relay connected to the explosion-proof solenoid valve are closed, the power supply circuit of the explosion-proof solenoid valve is disconnected, and the liquid level control system of the alkaline water electrolysis hydrogen production equipment is in a liquid storage state.

6. The liquid level control system of alkaline water electrolysis hydrogen production equipment according to claim 1, characterized in that: The liquid level signals collected by the differential pressure transmitter and the gas-liquid separator level meter are both 4-20mA current signals.

7. The liquid level control system of alkaline water electrolysis hydrogen production equipment according to claim 1, characterized in that: After the gas phase pressure pipe is led out, it first passes through the gas-liquid separator, where the gas-liquid separator is installed at the lowest point of the gas phase pressure system to ensure that the accumulated liquid is completely drained.

8. A liquid level control method for alkaline water electrolysis hydrogen production equipment applied to the liquid level control system of the alkaline water electrolysis hydrogen production equipment according to any one of claims 1 to 7, characterized in that: include: According to the working status feedback of the hydrogen production system, the central monitoring system sends instructions to the hydrogen production system controller to control the operation of the relay contacts, thereby controlling the working status of the differential pressure transmitter, the gas-liquid separator level gauge and the solenoid valve; When the central monitoring system sends instructions to the hydrogen production system controller, and controls the first and third contacts of the first and second intermediate relays to close respectively, the differential pressure transmitter and the gas-liquid separator level gauge are powered on, and the alkaline water electrolysis hydrogen production equipment liquid level measurement and control system is in the liquid level monitoring state; when the first and third contacts of the third intermediate relay are controlled to close, the explosion-proof solenoid valve is powered on, and the alkaline water electrolysis hydrogen production equipment liquid level measurement and control system is in the liquid discharge state; When the central monitoring system sends instructions to the hydrogen production system controller to control the first and second contacts of the corresponding first and second intermediate relays to close, the power supply circuits of the differential pressure transmitter and the gas-liquid separator level gauge are disconnected and are in an offline state; when the first and second contacts of the third intermediate relay are controlled to close, the power supply circuit of the explosion-proof solenoid valve is disconnected, and the liquid level measurement and control system of the alkaline water electrolysis hydrogen production equipment is in a liquid storage state.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the liquid level control method of the alkaline water electrolysis hydrogen production equipment as described in claim 8 are implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, the steps of the liquid level control method of the alkaline water electrolysis hydrogen production equipment as claimed in claim 8 are implemented.

Images