High-pressure drainage system based on PEM electrolytic bath

Abstract

The utility model relates to the technical field of PEM electrolytic baths, and provides a high-pressure drainage system based on a PEM electrolytic bath, which comprises a circulating water pump arranged at an inlet of the PEM electrolytic bath, a pressure sensor arranged at an outlet of the PEM electrolytic bath, and a primary gas-liquid separator, a pressure sensor and a second-stage gas-liquid separator are arranged at an outlet of the first-stage gas-liquid separator, the second-stage gas-liquid separator is provided with an upper liquid level sensor and a lower liquid level sensor, a back pressure valve is arranged at a gas outlet of the second-stage gas-liquid separator, and two pneumatic drain valves which are connected in parallel are arranged at a liquid outlet of the second-stage gas-liquid separator. A needle valve is arranged behind the pneumatic drain valve, and a needle valve is arranged behind the pneumatic drain valve. High-pressure and low-pressure drainage is performed by introducing the parallel pneumatic valve and the needle valve in a manner of dividing pressure levels and dividing drainage durations, so that the effects of discharging excessive water in equipment and keeping back pressure stable can be achieved during drainage under different pressure levels.

Description

Technical Field

[0001] The utility model relates to the technical field of PEM electrolyzers, and particularly relates to a high-pressure drainage system based on a PEM electrolyzer. Background Art

[0002] With the increasing depletion of traditional energy sources, the use and development of new energy have been increasingly put on the agenda and received extensive attention from society. In particular, PEM electrolyzers in the field of hydrogen production have the characteristics of low pollution, high gas production efficiency, high hydrogen production concentration, and high gas production pressure. A PEM electrolyzer, that is, a Proton Exchange Membrane Electrolyzer, is a device that uses a proton exchange membrane for water electrolysis. With its characteristics of high efficiency, compactness, and rapid response, PEM electrolyzers have significant advantages in the field of electrolytic water hydrogen production from renewable energy, and are particularly suitable for combining with intermittent renewable energy such as wind energy and solar energy to achieve green and efficient hydrogen production.

[0003] A PEM electrolyzer relies on electrolyzing water to produce hydrogen and oxygen. The gas mixture of water vapor generated after electrolyzing water needs to pass through a gas-liquid separator to separate the water in the gas, and then relatively pure hydrogen or oxygen can be obtained.

[0004] During the operation of a PEM electrolyzer, since the produced hydrogen and oxygen contain a large amount of water, the PEM electrolyzer needs to separate and drain water during operation. And as the PEM electrolyzer mostly operates under high pressure to produce gas, how to maintain the pressure stability in the electrolyzer system during drainage has become an urgent problem to be solved. Summary of the Utility Model

[0005] The utility model provides a high-pressure drainage system based on a PEM electrolyzer to solve the problem of how to maintain the pressure stability in the electrolyzer system during drainage.

[0006] The utility model provides a high-pressure drainage system based on a PEM electrolyzer, including:

[0007] A circulation water pump is connected to the inlet of the PEM electrolyzer and is used to provide water source for the PEM electrolyzer;

[0008] An electrolyzer outlet pressure sensor is installed at the outlet of the PEM electrolyzer and is used to monitor the pressure stability of the system;

[0009] A primary gas-liquid separator receives the gas generated by the PEM electrolyzer, removes the moisture therein, and is also used as a water storage tank for electrolyzing water;

[0010] A secondary gas-liquid separator inlet pressure sensor is arranged at the inlet of the secondary gas-liquid separator and is used to detect the pressure stability of the system;

[0011] The secondary gas-liquid separator processes the gas transmitted from the primary gas-liquid separator. The secondary gas-liquid separator is used to remove residual moisture from the gas. An upper liquid level sensor and a lower liquid level sensor are installed on the secondary gas-liquid separator. The upper liquid level sensor and the lower liquid level sensor are used to collect the water level information for the drainage operation. The secondary gas-liquid separator is provided with a gas outlet and a liquid outlet;

[0012] The back pressure valve is installed at the gas outlet of the secondary gas-liquid separator for adjusting the gas back pressure;

[0013] The first pneumatic drain valve and the first needle valve are connected in parallel at the liquid outlet of the secondary gas-liquid separator for maintaining stable back pressure during the drainage operation;

[0014] The second pneumatic drain valve and the second needle valve are connected in parallel at the liquid outlet of the secondary gas-liquid separator and work together with the first pneumatic drain valve and the first needle valve for maintaining stable back pressure;

[0015] The power supply is used to provide the required electric energy for the PEM electrolyzer to perform water electrolysis to produce hydrogen and oxygen.

[0016] According to the high-pressure drainage system based on the PEM electrolyzer described in the claim, after the second pneumatic drain valve and the second needle valve rotate, when the pressure is lower than 500 kPa, the first pneumatic drain valve is fully opened and the second pneumatic drain valve is fully closed at the same time.

[0017] The high-pressure drainage system based on the PEM electrolyzer includes the following steps: turn on the power supply, turn on the water pump, the PEM electrolyzer electrolyzes water to produce hydrogen and oxygen, set the working pressure of the back pressure valve, start the back pressure valve, observe the liquid level of the secondary gas-liquid separator, whether it reaches the upper liquid level. When the secondary gas-liquid separator reaches the upper liquid level, start drainage, judge the current pressure, determine the drainage method, and adopt different drainage methods at different pressure stages to keep the back pressure value stable. This method introduces a way of using parallel pneumatic valves and needle valves to divide the pressure levels and drainage durations for high- and low-pressure drainage, so that drainage at different pressure levels can achieve the effect of both discharging the excess water in the equipment and keeping the back pressure stable.

[0018] Advantages of the present utility model:

[0019] Improved pressure stability: By introducing the back pressure valve and the intelligent drainage control system, the present utility model significantly improves the pressure stability of the electrolyzer system during the drainage process. The back pressure valve can automatically adjust the system pressure, and the intelligent drainage control strategy ensures smooth and effective drainage at different pressure levels, thereby reducing pressure fluctuations and enhancing the stability and reliability of the system.

[0020] Improved water removal efficiency: Through the design of a two-stage gas-liquid separator, the utility model can more efficiently remove moisture from the electrolytic gas. The first-stage gas-liquid separator preliminarily removes most of the moisture, while the second-stage gas-liquid separator further processes it finely to ensure that the moisture in the gas is completely removed, thereby improving the purity and quality of the gas.

[0021] Automation and intelligence: By combining a liquid level sensor and an intelligent control system, the utility model realizes the automation and intelligence of the drainage process. The system can automatically judge when to start or stop drainage based on parameters such as liquid level and pressure, reducing the need for manual intervention and improving the convenience and accuracy of operation.

[0022] Wide applicability: The utility model is not only applicable to PEM electrolyzers, but can also be adjusted and applied to other types of electrolyzers or related gas treatment systems as needed, with strong versatility and flexibility.

[0023] Energy conservation and environmental protection: By optimizing the drainage process and control strategy, the utility model can reduce unnecessary energy consumption and water resource waste, thus achieving the goal of energy conservation and environmental protection to a certain extent.

[0024] In summary, through the beneficial effects such as improving pressure stability, water removal efficiency, automation and intelligence level, and wide applicability, the utility model has brought significant improvements and enhancements to the application in PEM electrolyzers and related fields. Brief description of the drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic diagram of the actual application scenario of a high-pressure drainage system based on a PEM electrolyzer provided by the present utility model.

[0027] Figure 2 It is a schematic diagram of the usage process of a high-pressure drainage system based on a PEM electrolyzer provided by the present utility model.

[0028] Illustration: 101. Electrolyzer outlet pressure sensor; 102. Primary gas-liquid separator; 103. Circulation water pump; 104. Secondary gas-liquid separator inlet pressure sensor; 105. Secondary gas-liquid separator; 106. Back pressure valve; 107. Upper liquid level of the secondary gas-liquid separator; 108. Lower liquid level of the secondary gas-liquid separator; 109. First pneumatic drain valve; 110. First needle valve; 111. Second pneumatic drain valve; 112. Second needle valve; 113. Power supply. Detailed implementation manners

[0029] Please refer to Figure 1 , an embodiment of the present utility model provides a high-pressure drainage system based on a PEM electrolyzer, including:

[0030] The circulation water pump 103 is connected to the inlet of the PEM electrolyzer and is used to provide water source for the PEM electrolyzer;

[0031] The electrolyzer outlet pressure sensor 101 is installed at the outlet of the PEM electrolyzer and is used to monitor the pressure stability of the system;

[0032] The primary gas-liquid separator 102 receives the gas generated by the PEM electrolyzer, removes the moisture therein, and is also used as a water storage tank for electrolyzed water;

[0033] The secondary gas-liquid separator inlet pressure sensor 104 is arranged at the inlet of the secondary gas-liquid separator 105 and is used to detect the pressure stability of the system;

[0034] The secondary gas-liquid separator 105 processes the gas transmitted from the primary gas-liquid separator 102. The secondary gas-liquid separator 105 is used to remove the residual moisture in the gas. An upper liquid level sensor 107 and a lower liquid level sensor 108 are installed on the secondary gas-liquid separator 105. The upper liquid level sensor 107 and the lower liquid level sensor 108 are used to collect the water level information for the drainage operation. The secondary gas-liquid separator 105 is provided with a gas outlet and a liquid outlet;

[0035] The back pressure valve 106 is installed at the gas outlet of the secondary gas-liquid separator 105 and is used to adjust the gas back pressure;

[0036] The first pneumatic drain valve 109 and the first needle valve 110 are connected in series at the liquid outlet of the secondary gas-liquid separator 105 and are used to maintain the back pressure stability during the drainage operation;

[0037] The second pneumatic drain valve 111 and the second needle valve 112 are connected in series at the liquid outlet of the secondary gas-liquid separator 105 and cooperate with the first pneumatic drain valve 109 and the first needle valve 110 to maintain the back pressure stability;

[0038] The power supply 113 is used to provide the required electric energy for the PEM electrolyzer to carry out water electrolysis to generate hydrogen and oxygen.

[0039] Specifically, the present invention provides a high-pressure drainage system based on a PEM electrolyzer. After the second pneumatic drainage valve 111 and the second needle valve 112 rotate, when the pressure is lower than 500 kPa, the first pneumatic drainage valve 109 is fully opened, and at the same time, the second pneumatic drainage valve 111 is fully closed.

[0040] Specifically, the present invention provides a high-pressure drainage system based on a PEM electrolyzer. When the pressure is between 0.5 and 3 MPa, the first pneumatic drainage valve 109 drains water in a fast pulse manner, and the second pneumatic drainage valve 111 is closed.

[0041] Specifically, the present invention provides a high-pressure drainage system based on a PEM electrolyzer. When the pressure is greater than 3 MPa, the second pneumatic drainage valve 111 drains water in a fast pulse manner, and the first pneumatic drainage valve 109 is closed.

[0042] The utility model solves the problem of how to maintain the pressure stability in the electrolyzer system during drainage in the following ways:

[0043] Adjustment of the back pressure valve: A back pressure valve is installed at the gas outlet of the secondary gas-liquid separator. The main function of this back pressure valve is to adjust the back pressure of the gas to ensure that the pressure inside the system can be maintained stable during the discharge of the gas generated by the electrolyzer. The back pressure valve can automatically adjust the opening degree according to the change of the system pressure, so as to maintain a constant back pressure and prevent pressure fluctuations caused by drainage operations.

[0044] Intelligent drainage control: The utility model adopts an intelligent drainage control system, which drains water by dividing the pressure levels and drainage durations through parallel pneumatic drainage valves and needle valves. Specifically, when the system pressure is lower than 500 kPa, the first pneumatic drainage valve is fully opened, and the second pneumatic drainage valve is fully closed; when the pressure is between 0.5 and 3 MPa, the second pneumatic drainage valve drains water in a fast pulse manner, while the first pneumatic drainage valve is closed; when the pressure is greater than 3 MPa, the drainage method will be adjusted according to the actual situation. This hierarchical drainage control method can ensure smooth drainage at different pressures and reduce the impact on the system pressure.

[0045] Application of liquid level sensors: The upper liquid level sensor and the lower liquid level sensor installed on the secondary gas-liquid separator are used to monitor the liquid level to ensure that the drainage operation is started or stopped at the appropriate time. This can avoid unnecessary drainage and thus reduce the possibility of pressure fluctuations.

[0046] The working principle of the utility model is as follows:

[0047] The utility model first provides a stable water source for the PEM electrolytic cell through a circulating water pump. The electrolytic cell electrolyzes water to generate hydrogen and oxygen under the condition of being powered on. The generated gas then enters the first gas-liquid separator, where most of the moisture in the gas is removed, and this separator also serves as a water storage tank for electrolyzing water.

[0048] Next, the processed gas enters the second gas-liquid separator for more refined moisture removal. The second gas-liquid separator is equipped with an upper liquid level sensor and a lower liquid level sensor, and these two sensors are responsible for monitoring the liquid level and providing accurate water level information for the drainage operation.

[0049] When the liquid level of the second gas-liquid separator reaches the preset upper limit, the system will start the drainage program. At this time, according to the pressure situation inside the system, an appropriate drainage mechanism is intelligently selected:

[0050] When the system pressure is lower than 500 kPa, the first pneumatic drain valve will be fully opened for drainage, while the second pneumatic drain valve remains closed.

[0051] When the pressure is in the range of 0.5 - 3 MPa, the first pneumatic drain valve will drain water in a fast pulse manner, and at this time the second pneumatic drain valve does not work.

[0052] When the pressure exceeds 3 MPa, the second pneumatic drain valve drains water in a fast pulse manner, and at this time the first pneumatic drain valve does not work.

[0053] In the whole drainage process, the back pressure valve plays a key role. It is responsible for regulating the back pressure of the gas to ensure that the system maintains a stable pressure throughout the operation process.

[0054] In this way, the utility model can effectively drain the excess moisture in the system under different pressure conditions while maintaining the stability of the back pressure, thereby ensuring the efficient and safe operation of the PEM electrolytic cell.

[0055] The above description is only the preferred embodiment of the utility model and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included within the protection scope of the utility model.

Claims

1. A high-pressure drainage system based on a PEM electrolyzer, characterized in that Including: A circulating water pump (103) is connected to the inlet of the PEM electrolyzer to supply water source for the PEM electrolyzer; An electrolyzer outlet pressure sensor (101) is installed at the outlet of the PEM electrolyzer to monitor the pressure stability of the system; A primary gas-liquid separator (102) receives the gas generated by the PEM electrolyzer, removes the moisture therein, and is also used as a water storage tank for electrolyzed water; A secondary gas-liquid separator inlet pressure sensor (104) is arranged at the inlet of the secondary gas-liquid separator (105) to detect the pressure stability of the system; The secondary gas-liquid separator (105) processes the gas transmitted from the primary gas-liquid separator (102). The secondary gas-liquid separator (105) is used to remove the residual moisture in the gas. An upper liquid level sensor (107) and a lower liquid level sensor (108) are installed on the secondary gas-liquid separator (105). The upper liquid level sensor (107) and the lower liquid level sensor (108) are used to collect the water level information for the drainage operation. The secondary gas-liquid separator (105) is provided with a gas outlet and a liquid outlet; A back pressure valve (106) is installed at the gas outlet of the secondary gas-liquid separator (105) to adjust the gas back pressure; A first pneumatic drain valve (109) and a first needle valve (110) are connected in parallel at the liquid outlet of the secondary gas-liquid separator (105) to maintain the back pressure stability during the drainage operation; A second pneumatic drain valve (111) and a second needle valve (112) are connected in parallel at the liquid outlet of the secondary gas-liquid separator (105), and cooperate with the first pneumatic drain valve (109) and the first needle valve (110) to keep the back pressure stable; A power supply (113) is used to provide the required electric energy for the PEM electrolyzer to generate hydrogen and oxygen by electrolyzing water.

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