Safety system based on slow pressure relief during high-pressure back pressure of PEM electrolytic cell

Abstract

The utility model relates to the technical field of backpressure of a PEM electrolytic bath, and provides a safety system based on slow pressure relief during high-pressure backpressure of the PEM electrolytic bath, which realizes accurate control and safe pressure relief of system pressure through the synergistic effect of key components such as a backpressure valve, a control EP-H converter, a needle valve and a gas-liquid separation tank. Under the overpressure condition, according to a preset automatic starting pressure relief program, pressure is slowly released through the needle valve, and the safety of the operation process is ensured. In addition, the gas-liquid separation tank effectively separates gas and liquid, and subsequent equipment is protected from being affected by the liquid. According to the design, the safety and the stability of the water electrolysis hydrogen production technology are improved, and the operation risk is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of PEM electrolyzer back pressure, and specifically relates to a safety system based on slow pressure relief during high-pressure back pressure of a PEM electrolyzer. Background Art

[0002] The PEM water electrolyzer uses a solid proton exchange membrane PEM as the electrolyte and pure water as the reactant. It only allows positive ions (here protons) to pass through, and does not allow electrons or negative ions (such as hydroxide ions) to pass through. This membrane is usually made of perfluorosulfonic acid membrane and can operate at higher pressures and temperatures, increasing the hydrogen production and improving the overall efficiency of the system.

[0003] Due to the low hydrogen permeability of the PEM electrolyte, the produced hydrogen has high purity, only water vapor needs to be removed, the process is simple, and the safety is high; the electrolyzer adopts a zero-spacing structure, with lower ohmic resistance, significantly improving the overall efficiency of the electrolysis process, and being more compact in volume, having a large pressure regulation range, and the hydrogen output pressure can reach several megapascals, adapting to the rapidly changing renewable energy power input.

[0004] The PEM electrolytic water hydrogen production technology is basically mature and has many advantages, such as simple system structure, high hydrogen production purity, large current density, high hydrogen production efficiency, safe and environmentally friendly, fast response speed, good matching with wind and solar power generation, etc., and has broad application prospects. However, there are certain risks in working under high-pressure conditions. Summary of the Utility Model

[0005] The utility model provides a safety system based on slow pressure relief during high-pressure back pressure of a PEM electrolyzer to solve the problem that there are certain risks in the PEM electrolytic water hydrogen production technology when working under high-pressure conditions.

[0006] The utility model provides a safety system based on slow pressure relief during high-pressure back pressure of a PEM electrolyzer. An embodiment of the utility model provides a safety system based on slow pressure relief during high-pressure back pressure of a PEM electrolyzer, including: a gas-liquid separation tank 1, a first solenoid valve 2, a second solenoid valve 3, a control EP-H converter 4, a needle valve 5, and a back pressure valve 6;

[0007] One end of the gas-liquid separation tank 1 is connected to the gas source, the other end of the gas-liquid separation tank 1 is connected to the back pressure valve 6, one end of the back pressure valve 6 is connected to the first exhaust port, and the other end of the back pressure valve 6 is connected to the first solenoid valve 2;

[0008] One end of the control EP-H converter 4 is connected to the driving gas source, and the other end of the control EP-H converter 4 is connected to the first solenoid valve 2;

[0009] One end of the second solenoid valve 3 is connected to the first solenoid valve 2, the other end of the second solenoid valve 3 is connected to the needle valve 5, and the needle valve 5 is connected to the second exhaust port;

[0010] Specifically, the model of the first solenoid valve 2 is SOV-N01, and the model of the second solenoid valve 3 is SOV-N02. When backpressure is applied, the first solenoid valve 2 is opened and the second solenoid valve 3 is closed, and the control EP-H converter 4 is used to adjust the backpressure.

[0011] Specifically, the model of the needle valve 5 is NV-N01. When the needle valve 5 is used for slow pressure relief, the first solenoid valve 2 is closed and the second solenoid valve 3 is opened.

[0012] Specifically, the pressure on the gas-liquid separation tank 1 is detected. If there is overpressure, the first solenoid valve 2 is closed, the second solenoid valve 3 is opened, and the needle valve 5 is opened to slowly relieve the pressure.

[0013] Advantages of the utility model:

[0014] Improve safety: Through precise pressure control and automatic pressure relief mechanism, the utility model significantly improves the safety of the electrolytic water hydrogen production process. Under high pressure conditions, the system can automatically detect and adjust the pressure to prevent overpressure, thus reducing the operation risk and the possibility of equipment damage.

[0015] Enhance stability: The coordinated action of controlling the EP-H converter and the backpressure valve enables the system to operate stably under different pressure conditions. This stability is crucial for ensuring the continuity and efficiency of the hydrogen production process.

[0016] Simplify operation: Through automatic control and monitoring, the utility model reduces the need for manual intervention, making the operation more convenient. In case of overpressure or emergency, the system can respond automatically, reducing the dependence on operators and improving work efficiency.

[0017] Protect equipment: The design of the gas-liquid separation tank effectively protects the subsequent equipment from being affected by liquids and extends the service life of the equipment. At the same time, precise pressure control also reduces the damage to the equipment caused by pressure fluctuations.

[0018] Improve overall efficiency: By optimizing the pressure control and pressure relief mechanism, the utility model not only improves the working efficiency of individual equipment but also enhances the overall efficiency of the entire hydrogen production system. This helps to reduce production costs and improve energy utilization efficiency.

[0019] In summary, through the beneficial effects of enhancing safety, stability, simplifying operation, protecting equipment and improving overall efficiency, the utility model provides important support and guarantee for the practical application of electrolytic water hydrogen production technology. Description of the drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the actual application scenario of a safety system for slow pressure relief when the PEM electrolyzer has high-pressure back pressure provided by the present invention.

[0022] Illustration: 1 - gas-liquid separation tank, 2 - first solenoid valve, 3 - second solenoid valve, 4 - control EP-H converter, 5 - needle valve, 6 - back pressure valve. Specific embodiments

[0023] Please refer to Figure 1 , the embodiments of the present invention provide a safety system for slow pressure relief when the PEM electrolyzer has high-pressure back pressure, including: a gas-liquid separation tank 1, a first solenoid valve 2, a second solenoid valve 3, a control EP-H converter 4, a needle valve 5, and a back pressure valve 6;

[0024] One end of the gas-liquid separation tank 1 is connected to the gas source, the other end of the gas-liquid separation tank 1 is connected to the back pressure valve 6, one end of the back pressure valve 6 is connected to the first exhaust port, and the other end of the back pressure valve 6 is connected to the first solenoid valve 2;

[0025] One end of the control EP-H converter 4 is connected to the driving gas source, and the other end of the control EP-H converter 4 is connected to the first solenoid valve 2;

[0026] One end of the second solenoid valve 3 is connected to the first solenoid valve 2, the other end of the second solenoid valve 3 is connected to the needle valve 5, and the needle valve 5 is connected to the second exhaust port.

[0027] Gas-liquid separation tank 1: The main function of the gas-liquid separation tank is to effectively separate the gas and liquid entering the system. This helps protect the subsequent equipment from being affected by the liquid and ensures the purity of the gas, thereby improving the operating efficiency and safety of the entire system.

[0028] Control EP-H converter 4 and back pressure valve 6: The control EP-H converter is installed on the back pressure valve and is used to dynamically adjust the opening degree of the back pressure valve according to the change of the internal pressure of the system. It can sense the pressure signal and convert it into a corresponding control signal, thereby accurately controlling the system back pressure and maintaining the stable operation of the system.

[0029] First solenoid valve 2 and second solenoid valve 3: The first solenoid valve (SOV-N01) and the second solenoid valve (SOV-N02) play a key control role in the system. In the backpressure state, the first solenoid valve opens to allow gas to enter the system and regulates the backpressure by controlling the EP-H converter; the second solenoid valve closes to prevent gas leakage. When slow pressure relief is required, the operation is reversed to achieve safe pressure release.

[0030] Needle valve 5: The needle valve (NV-N01) is connected to the second exhaust port and is used to control the pressure release rate within the system when slow pressure relief is needed. By adjusting the opening degree of the needle valve, the gas discharge rate can be precisely controlled, thus avoiding potential safety problems caused by sudden pressure drops. The design of the needle valve ensures the stability and controllability of the pressure relief process.

[0031] Specifically, the model of the first solenoid valve 2 is SOV-N01, the model of the second solenoid valve 3 is SOV-N02. When in backpressure, the first solenoid valve 2 is opened and the second solenoid valve 3 is closed, and the control EP-H converter 4 is used to adjust the backpressure.

[0032] Specifically, the model of the needle valve 5 is NV-N01. When the needle valve 5 is used for slow pressure relief, the first solenoid valve 2 is closed and the second solenoid valve 3 is opened.

[0033] Specifically, the pressure at the electrolyzer outlet and the pressure on the gas-liquid separation tank 1 are detected. If there is overpressure, the first solenoid valve 2 is closed, the second solenoid valve 3 is opened, and the needle valve 5 is opened to slowly relieve the pressure.

[0034] The working principle of the present utility model is a safety system based on slow pressure relief during high-pressure backpressure of a PEM electrolyzer, specifically as follows:

[0035] Gas-liquid separation tank 1: One end of this structure is connected to the gas source, and the other end is connected to the backpressure valve 6. Its main function is to effectively separate gas from liquid.

[0036] Control EP-H converter 4 and backpressure valve 6: This device is installed on the backpressure valve. One end is connected to the driving gas source, and the other end is connected to the first solenoid valve 2. Its main function is to dynamically adjust the opening and closing degree of the backpressure valve according to the pressure change inside the system, so as to precisely control the backpressure of the system.

[0037] The first solenoid valve 2 and the second solenoid valve 3: In this system, the model of the first solenoid valve 2 is SOV-N01, while the model of the second solenoid valve 3 is SOV-N02. In the back-pressure working state, the first solenoid valve 2 will open, and at the same time the second solenoid valve 3 will remain closed, so that the pressure in the system can be finely adjusted by controlling the EP-H converter 4. When the system needs to slowly relieve pressure, the operation is reversed, that is, the first solenoid valve 2 is closed and the second solenoid valve 3 is opened, so that the pressure inside the system can be slowly and safely released through the needle valve 5.

[0038] The needle valve 5: Its specific model is NV-N01 and is connected to the second exhaust port of the system. In the case of slow pressure relief required, the operator can finely control the pressure release speed inside the system by adjusting the opening degree of the needle valve 5, thus effectively avoiding various safety problems that may be caused by a sudden drop in pressure. The needle valve 5 is a slow pressure relief valve.

[0039] During the operation of the entire system, the system continuously monitors the outlet pressure of the electrolytic cell and the real-time pressure on the gas-liquid separation tank 1. Once an overpressure situation is detected, the system will automatically perform the operation of closing the first solenoid valve 2 and opening the second solenoid valve 3, and at the same time open the needle valve 5 for slow pressure relief, ensuring the stable operation and operational safety of the system in a high-pressure environment.

[0040] The utility model effectively solves the problem of the danger existing in the electrolytic water hydrogen production technology when working under high-pressure conditions.

[0041] Specifically, the utility model adopts the following strategies and methods:

[0042] Back-pressure control and safety pressure relief: By introducing a back-pressure valve and controlling the EP-H converter, the utility model can accurately control the back pressure in the system to ensure its operation within a safe range. When the system pressure exceeds the preset value, the control EP-H converter will adjust the opening degree of the back-pressure valve to reduce the system pressure.

[0043] Combined control of solenoid valves: The combination of the first solenoid valve (normally closed) and the second solenoid valve (normally open) is used to achieve precise control of the gas flow in the system. In the normal working state, the first solenoid valve is open and the second solenoid valve is closed to ensure the normal operation of the system; while in the case of pressure relief or emergency, the first solenoid valve is closed and the second solenoid valve is open to achieve safe pressure relief.

[0044] Slow pressure relief function of the needle valve: The design of the needle valve enables the gas to be slowly and stably released when pressure relief is required, avoiding system instability or safety accidents that may be caused by a sudden drop in pressure. By adjusting the opening degree of the needle valve, the pressure relief speed can be finely controlled to ensure the safety and controllability of the whole process.

[0045] Gas-liquid separation protection: The introduction of the gas-liquid separation tank effectively separates gas and liquid, protecting subsequent equipment from the influence of liquid, ensuring the purity of the gas entering the system, and improving the stability and safety of the system.

[0046] Real-time monitoring and automatic response: The system continuously monitors the pressure at the outlet of the electrolyzer and the pressure on the gas-liquid separation tank. Once overpressure is detected, it can automatically close the first solenoid valve and open the second solenoid valve, while opening the needle valve for slow pressure relief. This real-time monitoring and automatic response mechanism greatly enhances the safety of the system under high-pressure conditions.

[0047] In summary, the present utility model effectively solves the danger problem of the electrolytic water hydrogen production technology working under high-pressure conditions by comprehensively applying technical means such as backpressure control, solenoid valve combination control, slow pressure relief of the needle valve, gas-liquid separation protection, and real-time monitoring and automatic response, providing a strong guarantee for the safe application of the electrolytic water hydrogen production technology.

[0048] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, various changes and modifications can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A safety system based on slow pressure relief during high-pressure backpressure of a PEM electrolyzer, characterized in that Including: A gas-liquid separation tank (1), a first solenoid valve (2), a second solenoid valve (3), a control EP-H converter (4), a needle valve (5), and a back pressure valve (6); One end of the gas-liquid separation tank (1) is connected to a gas source, the other end of the gas-liquid separation tank (1) is connected to the back pressure valve (6), one end of the back pressure valve (6) is connected to a first exhaust port, and the other end of the back pressure valve (6) is connected to the first solenoid valve (2); One end of the control EP-H converter (4) is connected to a driving gas source, and the other end of the control EP-H converter (4) is connected to the first solenoid valve (2); One end of the second solenoid valve (3) is connected to the first solenoid valve (2), the other end of the second solenoid valve (3) is connected to the needle valve (5), and the needle valve (5) is connected to a second exhaust port.

2. The safety system for slow pressure relief during high-pressure backpressure of a PEM electrolyzer according to claim 1, wherein The model of the first solenoid valve (2) is SOV-N01, the model of the second solenoid valve (3) is SOV-N02. When there is back pressure, the first solenoid valve (2) is opened and the second solenoid valve (3) is closed. The control EP-H converter (4) is used to adjust the back pressure.

3. The safety system for slow pressure relief during high-pressure backpressure of a PEM electrolyzer according to claim 1, wherein The model of the needle valve (5) is NV-N01. When the needle valve (5) is used for slow pressure relief, the first solenoid valve (2) is closed and the second solenoid valve (3) is opened.

4. The safety system for slow pressure relief during high-pressure backpressure of a PEM electrolyzer according to claim 1, characterized in that, Detect the pressure at the outlet of the electrolytic cell and the pressure on the gas-liquid separation tank (1). If there is overpressure, close the first solenoid valve (2), open the second solenoid valve (3), and slowly relieve the pressure by opening the needle valve (5).

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