Device and method for detecting air tightness of diaphragm for hydrogen production by water electrolysis

Abstract

The invention relates to an air tightness detection device and method for a diaphragm for hydrogen production through water electrolysis, and relates to the technical field of hydrogen production through water electrolysis. The diaphragm airtightness detection device comprises a detection tube, a diaphragm to be detected is fixed in the detection tube, an electric heating wire is arranged below the diaphragm to be detected, an alkali liquor inlet and an alkali liquor outlet which are used for circulation of reaction alkali liquor are formed in the peripheral wall of the bottom end of the detection tube, and a net-shaped platform is arranged on the bottom wall in the detection tube. Reaction metal used for reacting with reaction alkali liquor is placed on the net-shaped platform, and the side wall of the detection pipe is communicated with a U-shaped reading pipe used for recording readings. The diaphragm air tightness detection device has the effect of improving the reliability of air tightness detection of the diaphragm for water electrolysis hydrogen production.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen production by electrolysis of water, and in particular to a diaphragm air tightness detection device and method for hydrogen production by electrolysis of water. Background Art

[0002] The principle of hydrogen production by water electrolysis is to fill the electrolyzer with electrolyte, and after direct current is passed, water molecules undergo electrochemical reactions on the electrodes and decompose into hydrogen and oxygen. This technology has important applications in fields such as fuel cell vehicles and semiconductor manufacturing. The diaphragm is an important component in the process of hydrogen production by water electrolysis. It plays a role in separating the anode and cathode and allowing ions to move. Therefore, the airtightness of the diaphragm is an important criterion for measuring the quality of the diaphragm. In the prior art, the airtightness detection method for the diaphragm used for hydrogen production by water electrolysis detects the airtightness of the diaphragm to the air. In actual hydrogen production equipment, the molecular size of the product hydrogen is much smaller than that of air. Therefore, the current detection method is different from the actual working conditions and is not reliable for the actual application of the diaphragm in the electrolyzer, so it needs to be improved. Summary of the invention

[0003] In order to improve the reliability of the air tightness detection of the diaphragm used for hydrogen production by electrolysis of water, the present application provides a device and method for detecting the air tightness of the diaphragm used for hydrogen production by electrolysis of water.

[0004] In the first aspect, the present application provides a diaphragm air tightness detection device for hydrogen production by water electrolysis, which adopts the following technical solution: A diaphragm air tightness detection device for electrolyzing water to produce hydrogen comprises a detection tube, a diaphragm to be detected is fixed inside the detection tube, an electric heating wire is arranged below the diaphragm to be detected, an alkali solution inlet and an alkali solution outlet for circulating a reaction alkali solution are arranged on the peripheral wall of the bottom end of the detection tube, a mesh platform is arranged on the bottom wall inside the detection tube, a reaction metal for reacting with the reaction alkali solution is placed on the mesh platform, and a U-shaped reading tube for recording readings is connected to the side wall of the detection tube.

[0005] By adopting the above technical scheme, the reaction alkali solution reacts with the reaction metal to generate hydrogen. When the pressure below the diaphragm to be tested increases to a certain level, the hydrogen will enter the top of the diaphragm to be tested in the form of bubbles. By recording the reading when the first bubble is generated through a U-shaped reading tube, the airtightness of the diaphragm to be tested can be measured. The device of the present application is easy to operate, can simulate actual working conditions, and improves the reliability of airtightness detection of diaphragms used for hydrogen production by electrolysis of water.

[0006] Preferably, the reaction alkali solution is potassium hydroxide, the concentration of the reaction alkali solution is 30%, and the reaction metal is aluminum.

[0007] By adopting the above technical solution, potassium hydroxide and aluminum react conveniently, which can effectively simulate the generation of hydrogen and has many advantages such as convenient operation and economic saving.

[0008] Preferably, the inner wall of the detection tube is provided with an installation cavity for installing the diaphragm to be tested.

[0009] By adopting the above technical solution, the installation cavity is opened to facilitate the installation of the diaphragm to be tested, so that the installation position of the diaphragm to be tested is fixed, which helps to improve the accuracy of subsequent test values ​​and improve the reliability of the air tightness detection of the diaphragm for hydrogen production by water electrolysis.

[0010] Preferably, two fixed rubber rings are arranged in the installation cavity, and the diaphragm to be tested is fixed between the fixed rubber rings on both sides.

[0011] By adopting the above technical solution, setting a fixed rubber ring can effectively improve the fixing stability of the diaphragm to be tested, so as to prevent the problem that the fixing place of the diaphragm to be tested cannot withstand the pressure value and affects the test result.

[0012] Preferably, solenoid valves are provided on both the alkali solution inlet and the alkali solution outlet.

[0013] By adopting the above technical solution, setting up a solenoid valve can effectively improve the controllability of the diaphragm air tightness detection device for hydrogen production by electrolysis of water in the present application, so that the detection process can be controlled more conveniently and efficiently, which helps to improve the reliability of the diaphragm air tightness detection results for hydrogen production by electrolysis of water.

[0014] In a second aspect, the present application also provides a method for detecting the air tightness of a diaphragm for producing hydrogen by electrolysis of water, comprising the following steps: S1: Take an appropriate amount of reactive metal and place it on the mesh platform; S2: Flatten the diaphragm to be tested and fix it between the fixed rubber rings on both sides, and use a small hydraulic press to press the diaphragm to be tested; S3: pour an appropriate amount of reaction alkali solution with a mass concentration of 30% from the top of the test tube, and add reaction alkali solution with a mass concentration of 30% through the alkali solution inlet until the space below the diaphragm to be tested is filled; S4: Start the electric heating wire to heat the reaction alkali solution; S5: When the pressure on the lower side of the detection diaphragm increases until the first bubble appears on the upper side of the diaphragm to be detected, the pressure value when the first bubble is generated is recorded through a U-shaped reading tube.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 1. The reaction alkali solution reacts with the reaction metal to generate hydrogen. When the pressure below the diaphragm to be tested increases to a certain level, the hydrogen will enter the top of the diaphragm to be tested in the form of bubbles. The reading when the first bubble is generated is recorded by the U-shaped reading tube, and the air tightness of the diaphragm to be tested can be measured. The device of the present application is easy to operate, can simulate actual working conditions, and improves the reliability of the air tightness detection of the diaphragm for hydrogen production by electrolysis of water; 2. Potassium hydroxide reacts easily with aluminum, which can effectively simulate the generation of hydrogen, and has many advantages such as convenient operation and economic savings; 3. The installation cavity is provided to facilitate the installation of the diaphragm to be tested, so that the installation position of the diaphragm to be tested is fixed, which helps to improve the accuracy of subsequent test values ​​and the reliability of the air tightness test of the diaphragm for hydrogen production by electrolysis of water; the setting of a fixed rubber ring can effectively improve the fixing stability of the diaphragm to be tested to prevent the problem that the fixing part of the diaphragm to be tested cannot withstand the pressure value and affect the test results; 4. There is 30% potassium hydroxide solution on both sides of the diaphragm to be tested, which can effectively simulate the actual operating conditions and improve the reliability of the air tightness test results of the diaphragm used for hydrogen production by water electrolysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a diaphragm air tightness detection device for producing hydrogen by electrolysis of water according to an embodiment of the present application.

[0017] Explanation of the reference numerals: 1. Detection tube; 2. Diaphragm to be tested; 3. Electric heating wire; 4. Alkali solution inlet; 5. Alkali solution outlet; 6. Mesh platform; 7. Reaction metal; 8. U-shaped reading tube; 9. Installation cavity; 10. Fixed rubber ring; 11. Solenoid valve. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1 This application is described in further detail.

[0019] The present application embodiment discloses a diaphragm air tightness detection device for hydrogen production by water electrolysis. Figure 1 , including a detection tube 1, a mounting cavity 9 is opened in the detection tube 1 for mounting a diaphragm 2 to be tested, two fixed rubber rings 10 are arranged in the mounting cavity 9, and the two fixed rubber rings 10 are distributed in the vertical direction. The diaphragm 2 to be tested is straightened and fixed between the fixed rubber rings 10 on both sides, and is compressed by a small hydraulic press to ensure the stability of the installation of the diaphragm 2 to be tested, so that the diaphragm 2 to be tested is not easy to loosen under high pressure, thereby ensuring the reliability of the air tightness test result of the diaphragm for hydrogen production by electrolysis of water; the presence of the diaphragm 2 to be tested divides the detection tube 1 into an upper and lower side, and in the process of the air tightness test of the diaphragm for hydrogen production by electrolysis of water, the reaction alkali solution needs to be injected from the top of the detection tube 1.

[0020] Reference Figure 1Three interfaces are welded on the outer wall of the detection tube 1, two of which are located below the detection tube 1 for circulating the reaction alkali solution. The two interfaces are respectively provided with an alkali solution inlet 4 and an alkali solution outlet 5. The alkali solution inlet 4 and the alkali solution outlet 5 are both provided with an electromagnetic valve 11 for controlling the on-off of the alkali solution inlet 4 and the alkali solution outlet 5, thereby controlling the normal circulation of the reaction alkali solution in the detection tube 1, thereby improving the automation performance and controllability of the diaphragm air tightness detection device for electrolysis of water to produce hydrogen in the present application; in this embodiment, the reaction alkali solution adopts a potassium hydroxide solution with a mass concentration of 30%; a mesh platform 6 is provided on the inner bottom wall of the detection tube 1, and a reaction metal 7 for reacting with the reaction alkali solution is placed on the surface of the mesh platform 6. In this embodiment, the reaction metal 7 is selected from aluminum to react with the potassium hydroxide solution to generate hydrogen, simulating the actual working conditions of electrolysis of water to produce hydrogen, and measuring the air tightness of the diaphragm to be tested relative to hydrogen.

[0021] Reference Figure 1 An electric heating wire 3 is arranged in the detection tube 1, and the electric heating wire 3 is located below the diaphragm 2 to be tested. When the electric heating wire is energized, the temperature of the reaction alkali solution can be increased for heating, so that the potassium hydroxide solution and the aluminum are at an appropriate reaction temperature to maintain the normal progress of the reaction, thereby ensuring that the present application can be used in cold weather, and improving the flexibility and applicability of the diaphragm air tightness detection device for hydrogen production by electrolysis of water of the present application.

[0022] Reference Figure 1 Another interface on the detection tube 1 is connected to a U-shaped reading tube 8, and a scale is set on the U-shaped reading tube 8. When the staff performs the diaphragm air tightness test, it is necessary to observe the bubble generation in the potassium hydroxide solution on the upper side of the diaphragm 2 to be tested, so as to record the pressure value on the U-shaped reading tube 8 when the first bubble is generated, so as to measure the air tightness of the diaphragm 2 to be tested, thereby improving the reliability of the diaphragm air tightness test results.

[0023] The implementation principle of the diaphragm air tightness detection device for hydrogen production by electrolysis of water in the embodiment of the present application is as follows: potassium hydroxide solution reacts with aluminum to generate hydrogen. When the pressure below the diaphragm 2 to be tested increases to a certain level, the hydrogen will enter the top of the diaphragm 2 to be tested in the form of bubbles. The reading when the first bubble is generated is recorded by the U-shaped reading tube 8, so that the air tightness of the diaphragm 2 to be tested can be measured. The device of the present application is easy to operate, can simulate actual working conditions, and improves the reliability of the air tightness detection of the diaphragm for hydrogen production by electrolysis of water.

[0024] The present application also provides a method for detecting the air tightness of a diaphragm for hydrogen production by electrolysis of water, comprising the following steps: S1: Take an appropriate amount of reactive metal 7 and place it on the mesh platform 6; S2: Flatten the diaphragm 2 to be tested and fix it between the fixed rubber rings 10 on both sides, and use a small hydraulic press to press the diaphragm 2 to be tested; S3: Pour an appropriate amount of reaction alkali solution with a mass concentration of 30% from the top of the test tube 1, and add the reaction alkali solution with a mass concentration of 30% through the alkali solution inlet 4 until the space below the diaphragm 2 to be tested is filled; S4: Start the electric heating wire 3 to heat the reaction alkali solution; S5: The pressure at the lower side of the diaphragm to be tested increases until the first bubble appears at the upper side of the diaphragm to be tested 2, and the pressure value when the first bubble is generated is recorded by the U-shaped reading tube 8.

[0025] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A diaphragm air tightness detection device for hydrogen production by water electrolysis, characterized in that: It comprises a detection tube, in which a diaphragm to be tested is fixed, an electric heating wire is arranged below the diaphragm to be tested, an alkali solution inlet and an alkali solution outlet are arranged on the peripheral wall of the bottom end of the detection tube for circulating the reaction alkali solution, a mesh platform is arranged on the bottom wall inside the detection tube, a reaction metal for reacting with the reaction alkali solution is placed on the mesh platform, and a U-shaped reading tube for recording readings is connected to the side wall of the detection tube.

2. The diaphragm air tightness detection device for hydrogen production by water electrolysis according to claim 1, characterized in that: The reaction alkali solution is potassium hydroxide, the concentration of the reaction alkali solution is 30%, and the reaction metal is aluminum.

3. The diaphragm air tightness detection device for hydrogen production by water electrolysis according to claim 1, characterized in that: The inner wall of the detection tube is provided with an installation cavity for installing the diaphragm to be tested.

4. The diaphragm air tightness detection device for hydrogen production by water electrolysis according to claim 3, characterized in that: Two fixed rubber rings are arranged in the installation cavity, and the diaphragm to be tested is fixed between the fixed rubber rings on both sides.

5. The diaphragm air tightness detection device for hydrogen production by water electrolysis according to claim 1, characterized in that: The alkali solution inlet and the alkali solution outlet are both provided with electromagnetic valves.

6. A method for detecting the air tightness of a diaphragm for producing hydrogen by electrolysis of water, characterized in that: The steps include: S1: Take an appropriate amount of reactive metal and place it on the mesh platform; S2: Flatten the diaphragm to be tested and fix it between the fixed rubber rings on both sides, and use a small hydraulic press to press the diaphragm to be tested; S3: pour an appropriate amount of reaction alkali solution with a mass concentration of 30% from the top of the test tube, and add reaction alkali solution with a mass concentration of 30% through the alkali solution inlet until the space below the diaphragm to be tested is filled; S4: Start the electric heating wire to heat the reaction alkali solution; S5: When the pressure on the lower side of the detection diaphragm increases until the first bubble appears on the upper side of the diaphragm to be detected, the pressure value when the first bubble is generated is recorded through a U-shaped reading tube.

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