Graded pressure maintaining hydraulic pump station for hydrogen production electrolytic cell

Abstract

The utility model discloses a hydrogen production electrolytic cell grading pressure maintaining hydraulic pump station which comprises a control system and a gas drive ultrahigh pressure hydraulic system, the gas drive ultrahigh pressure hydraulic system comprises a pneumatic three-element, and the outlet end of the pneumatic three-element is respectively connected with a pneumatic reversing valve, a high-pressure unloading pneumatic reversing valve and a high-pressure pressure maintaining pneumatic reversing valve. The pneumatic reversing valve is communicated with an air inlet of the high-pressure air-driven pump core through the high-pressure air-driven pump reversing valve, an oil inlet of the high-pressure air-driven pump core is communicated with the oil storage tank, an oil outlet of the high-pressure air-driven pump core is communicated with the high-pressure pressure-maintaining pneumatic stop valve, and the high-pressure pressure-maintaining pneumatic stop valve is respectively communicated with the high-pressure unloading pneumatic stop valve and a system oil outlet. The high-pressure unloading pneumatic stop valve is communicated with the oil storage tank; the high-pressure unloading pneumatic reversing valve is communicated with the high-pressure unloading pneumatic stop valve, and the high-pressure pressure-maintaining pneumatic reversing valve is communicated with the high-pressure pressure-maintaining pneumatic stop valve. Through the application of a plurality of groups of pneumatic control valves, automatic pressure boosting and pressure maintaining are realized.

Description

Technical Field

[0001] The utility model relates to a hydraulic pumping station for the pressing process of a dedicated alkaline water electrolyzer (ALK electrolyzer), which is used to provide power for a hydraulic bolt stretcher during the pressing process of the ALK electrolyzer, and belongs to the technical field of 2000bar ultra-high pressure hydraulic products. Background Technique

[0002] The ALK electrolyzer is the core component of the alkaline water electrolysis hydrogen production system, and its assembly quality is crucial. The main components of the ALK electrolyzer include bipolar plates, anodes, cathode electrodes, diaphragms, gaskets, etc. The pressing of these components is achieved through end plates, screws, disc springs, and nuts at both ends of the electrolyzer.

[0003] Currently, the pressing process of the electrolyzer is mainly completed by a hydraulic bolt stretcher. During the entire pressing process, steps such as pre-tightening, cold tightening, hot tightening, and final tightening need to be carried out in sequence according to the process requirements. Each stage not only has different requirements for the tensile force of the hydraulic bolt stretcher but also has different requirements for the maintenance time of the tensile force.

[0004] Therefore, the output pressure and pressure holding time required by the hydraulic pumping station supporting the hydraulic bolt stretcher are also different in each process stage.

[0005] The existing technology has the following defects:

[0006] 1. The hydraulic pumping station supporting the bolt stretcher needs to output different working pressures at different pressing stages of the electrolyzer. Currently, this pressure adjustment is usually manually carried out by on-site operators multiple times according to the process requirements. However, this manual adjustment is difficult to ensure the adjustment accuracy and repeatability of the output pressure.

[0007] 2. The hydraulic pumping station usually uses an ultra-high pressure electric pump, and its supporting manual unloading valve requires manual operation and cannot achieve automatic control. Therefore, such a hydraulic pumping station cannot automatically boost pressure and hold pressure according to the process requirements.

[0008] 3. The hydraulic pumping station supporting the bolt stretcher lacks the function of recording key process parameters such as the magnitude of the output pressure and the pressure holding time. In most cases, it still relies on manual input to record this information. Summary of the Invention

[0009] The technical problem to be solved by the utility model is: the problem that the manual adjustment of the working pressure of the hydraulic pumping station supporting the bolt stretcher is difficult to ensure the output accuracy and the lack of the function of automatically recording process parameters.

[0010] To solve the above problems, the present utility model provides a hydrogen production electrolytic cell hierarchical pressure-maintaining hydraulic pump station, which includes a control system and a gas-driven ultra-high pressure hydraulic system. The gas-driven ultra-high pressure hydraulic system includes pneumatic three elements. The outlet ends of the pneumatic three elements are respectively connected to a pneumatic reversing valve, a high-pressure unloading pneumatic reversing valve, and a high-pressure pressure-maintaining pneumatic reversing valve. The pneumatic reversing valve is communicated with the air inlet of a high-pressure gas-driven pump reversing valve and a high-pressure gas-driven pump core. The oil inlet of the high-pressure gas-driven pump core is communicated with an oil storage tank. The oil outlet of the high-pressure gas-driven pump core is communicated with a high-pressure pressure-maintaining pneumatic stop valve. The high-pressure pressure-maintaining pneumatic stop valve is respectively communicated with a high-pressure unloading pneumatic stop valve and a system oil outlet. The high-pressure unloading pneumatic stop valve is communicated with the oil storage tank; the high-pressure unloading pneumatic reversing valve is communicated with the high-pressure unloading pneumatic stop valve, and the high-pressure pressure-maintaining pneumatic reversing valve is communicated with the high-pressure pressure-maintaining pneumatic stop valve; the control system includes an industrial control computer with software. The industrial control computer is connected to a super-high pressure gas-driven pump core, a pressure sensor, a pneumatic proportional valve, and a pneumatic reversing valve through a PLC module.

[0011] Preferably, an outlet pressure sensor is provided at the system oil outlet.

[0012] Preferably, a driving air pressure sensor is provided between the pneumatic reversing valve and the high-pressure gas-driven pump reversing valve.

[0013] The present utility model uses an industrial control computer to control the gas-driven ultra-high pressure hydraulic system, achieving the effect of automatically executing process parameters. The informatization characteristics of the present utility model realize the functions of on-site man-machine data interaction and process data storage. By using a super-high pressure gas-driven pump to replace a super-high pressure electric hydraulic pump, through the application of multiple groups of pneumatic control valves and with the assistance of an industrial control computer, the present utility model realizes automatic pressure boosting and pressure maintaining according to process requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the control system in the present utility model;

[0015] Figure 2 is a schematic diagram of the gas-driven ultra-high pressure hydraulic system in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To make the present utility model more obvious and understandable, the following is a detailed description with preferred embodiments and accompanying drawings.

[0017] Embodiment

[0018] As Figure 1-2As shown in the figure, a hierarchical pressure-maintaining hydraulic pump station for a hydrogen production electrolytic cell provided by the present utility model includes a control system and a gas-driven ultra-high pressure hydraulic system. The gas-driven ultra-high pressure hydraulic system includes three pneumatic components 12. The outlet ends of the three pneumatic components 12 are respectively connected to a pneumatic reversing valve 7, a high-pressure unloading pneumatic reversing valve 7.2, and a high-pressure pressure-maintaining pneumatic reversing valve 7.3. The pneumatic reversing valve 7 is connected to the air inlet of a high-pressure gas-driven pump core 5 through a high-pressure gas-driven pump reversing valve 7.1. The oil inlet of the high-pressure gas-driven pump core 5 is connected to an oil storage tank 11. The oil outlet of the high-pressure gas-driven pump core 5 is connected to a high-pressure pressure-maintaining pneumatic stop valve 8. The high-pressure pressure-maintaining pneumatic stop valve 8 is respectively connected to a high-pressure unloading pneumatic stop valve 9 and a system oil outlet 10. The high-pressure unloading pneumatic stop valve 9 is connected to the oil storage tank 11; the high-pressure unloading pneumatic reversing valve 7.2 is connected to the high-pressure unloading pneumatic stop valve 9, and the high-pressure pressure-maintaining pneumatic reversing valve 7.3 is connected to the high-pressure pressure-maintaining pneumatic stop valve 8; the control system includes an industrial control computer 1 provided with software 2. The industrial control computer 1 is connected to the ultra-high pressure gas-driven pump core 5, a pressure sensor 4, a pneumatic proportional valve 6, and a pneumatic reversing valve 7 through a PLC module 3 for control.

[0019] An outlet pressure sensor 4.2 is provided at the system oil outlet 10.

[0020] A driving air pressure sensor 4.1 is provided between the pneumatic reversing valve 7 and the high-pressure gas-driven pump reversing valve 7.1.

[0021] Among them, the industrial control computer 1 adopts an industrial computer, and the software 2 is an off-the-shelf open-source software programmed according to process requirements. This system has data storage and human-machine information interaction functions.

[0022] Through the above control system, the pressing pressure and pressure-maintaining time at different pressing stages of the electrolytic cell can be pre-input and directly called during the working process. Then, the control system will automatically control the gas-driven ultra-high pressure hydraulic system to execute the corresponding process parameters.

[0023] The pressure sensor 4 includes a driving air pressure sensor 4.1 and an outlet pressure sensor 4.2. The driving air pressure sensor 4.1 is used to detect the output pressure of the system pneumatic proportional valve 6 and feedback the value to the PLC module 3. The outlet pressure sensor 4.2 is used to detect the output pressure of the system oil outlet 10 and feedback the value to the PLC module 3.

[0024] The core component of the gas-driven ultra-high pressure hydraulic system is the high-pressure gas-driven pump core 5. Its operation is controlled by the high-pressure gas-driven pump reversing valve 7.1. The driving air pressure sensor 4.1 is used to feedback the current driving pressure to the PLC module 3. The industrial control computer 1 controls the system pneumatic proportional valve 6 to output the corresponding driving pressure to the high-pressure gas-driven pump core 5. The high-pressure gas-driven pump core 5 outputs the pressurized hydraulic pressure at a rated pressure increase ratio according to the magnitude of the input compressed air pressure.

[0025] The pneumatic reversing valve 7 includes a high-pressure gas-driven pump reversing valve 7.1, a high-pressure unloading pneumatic reversing valve 7.2, and a high-pressure pressure-holding pneumatic reversing valve 7.3. The high-pressure gas-driven pump reversing valve 7.1 receives the instructions from the PLC module 3 and controls the operation of the high-pressure gas-driven pump core 5. The high-pressure gas-driven pump reversing valve 8.2 receives the instructions from the PLC module 3 and controls the operation of the high-pressure gas-driven pump core 6. The high-pressure unloading pneumatic reversing valve 7.2 receives the instructions from the PLC module 3 and controls the high-pressure unloading pneumatic stop valve 9 to unload the system. The high-pressure pressure-holding pneumatic reversing valve 7.3 receives the instructions from the PLC module 3 and controls the high-pressure pressure-holding pneumatic stop valve 8 to achieve stage pressure-holding of the system.

[0026] The oil storage tank 11 is used to store the hydraulic medium required for the operation of the system.

[0027] The pneumatic three-element 12 is used to adjust the compressed air pressure for driving the gas-driven ultra-high pressure hydraulic system.

Claims

1. A graded pressure-maintaining hydraulic pump station for hydrogen production electrolyzers, characterized in that: The invention comprises a control system and an air-driven ultra-high pressure hydraulic system. The air-driven ultra-high pressure hydraulic system comprises three pneumatic components (12). The outlet ends of the three pneumatic components (12) are respectively connected to a pneumatic reversing valve (7), a high-pressure unloading pneumatic reversing valve (7.2), and a high-pressure pressure-maintaining pneumatic reversing valve (7.3). The pneumatic reversing valve (7) is connected to the air inlet of a high-pressure air-driven pump core (5) through a high-pressure air-driven pump reversing valve (7.1). The oil inlet of the high-pressure air-driven pump core (5) is connected to an oil storage tank (11). The oil outlet of the high-pressure air-driven pump core (5) is connected to a pressure-maintaining pneumatic stop valve (8). The high-pressure pressure-maintaining pneumatic stop valve (8) is connected to the oil storage tank (11). The valves (8) are respectively connected to the high-pressure unloading pneumatic stop valve (9) and the system oil outlet (10); the high-pressure unloading pneumatic stop valve (9) is connected to the oil storage tank (11); the high-pressure unloading pneumatic reversing valve (7.2) is connected to the high-pressure unloading pneumatic stop valve (9); the high-pressure pressure-maintaining pneumatic reversing valve (7.3) is connected to the high-pressure pressure-maintaining pneumatic stop valve (8); the control system comprises an industrial computer (1) provided with software (2); the industrial computer (1) controls the connection of the ultra-high-pressure air-driven pump core (5), the pressure sensor (4), the pneumatic proportional valve (6), and the pneumatic reversing valve (7) through a PLC module (3).

2. The hydrogen production electrolyzer graded pressure-maintaining hydraulic pump station according to claim 1, characterized in that: The system oil outlet (10) is provided with an outlet pressure sensor (4.2).

3. The hydrogen production electrolyzer graded pressure-maintaining hydraulic pump station according to claim 1, characterized in that: A driving air pressure sensor (4.1) is provided between the pneumatic reversing valve (7) and the high-pressure air-driven pump reversing valve (7.1).

Images