Off-line activation device for electrolyzed water membrane electrode

Abstract

The utility model relates to the field of anion exchange membrane water electrolysis hydrogen production, and provides an off-line activation device of an electrolysis water membrane electrode, which comprises an alkali liquor storage tank, a non-alkali liquor storage tank, a pure water storage tank and a plurality of membrane electrode activation units, each membrane electrode activation unit comprises a cathode chamber and an anode chamber, and a membrane electrode is arranged between the cathode chamber and the anode chamber; an inlet of the cathode chamber is communicated with a cathode liquid inlet pipeline, and one end, far away from the cathode chamber, of the cathode liquid inlet pipeline is communicated with an alkali liquor storage tank and a non-alkali liquor storage tank; an outlet of the cathode chamber is communicated with an alkali liquor outlet branch and a non-alkali liquor outlet branch, one end, far away from the cathode chamber, of the alkali liquor outlet branch is communicated with an alkali liquor storage tank, and one end, far away from the cathode chamber, of the non-alkali liquor outlet branch is communicated with a non-alkali liquor storage tank; the pure water storage tank is communicated with the anode chamber; an alkali liquor inlet valve is arranged on the alkali liquor inlet branch; a non-alkali liquid inlet valve is arranged on the non-alkali liquid inlet branch; an alkali liquor outlet valve is arranged on the alkali liquor outlet branch; a non-alkali liquor outlet valve is arranged on the non-alkali liquor outlet branch; and an anode liquid inlet valve is arranged on the anode liquid inlet pipeline. The method has the advantage of improving activation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen production by anion exchange membrane electrolysis of water, and more specifically, to an offline activation device for an electrolysis membrane electrode. Background Technology

[0002] Hydrogen production through water electrolysis is one of the core technologies driving carbon neutrality. By replacing fossil fuels with green hydrogen, it helps decarbonize industries and store renewable energy. Anion exchange membrane (AEM) water electrolysis has become a technological focus due to its unique advantages: it uses non-precious metal catalysts and solid anion exchange membranes, combining the low cost of alkaline electrolyzers with the high efficiency and compactness of proton exchange membranes (PEMs). It can quickly respond to fluctuating power sources under normal pressure, and its modular design is suitable for distributed hydrogen production scenarios, providing a cost-effective and environmentally friendly solution for large-scale green hydrogen production.

[0003] Because of I - ,Br - Cl - and HCO3 - The ions have weak nucleophilicity, which can significantly slow down the degradation rate of quaternary ammonium groups; and in the process of AEM membrane preparation, Br - Cl - Ions are easier to use as initial ions to achieve uniform doping. AEM films often use I0. - ,Br - Cl - and HCO3 - Ions serve as the initial ion pair for the AEM membrane. During the AEM water electrolysis for hydrogen production, quaternary ammonium groups attract and conduct OH groups. - Ions are used to achieve ion transport. Therefore, before the AEM water electrolysis reaction begins, it is necessary to remove the I+ ions from the AEM membrane. - ,Br - Cl - Or HCO3 - Initially, the ion is replaced by OH. - That is, to perform ion replacement activation.

[0004] The current activation methods are mainly divided into two types. (1) Immerse the AEM water electrolysis hydrogen production CCM or MEA in 1M KOH solution, and replace the initial pair ions in the AEM membrane with OH- through ion exchange. This method requires a significant change in the size of the immersion equipment depending on the number of AEM water electrolysis hydrogen production CCM or MEA activated at one time. It also requires a large amount of KOH solution for immersion ion exchange. In addition, this exchange method has low efficiency and requires a long activation time. (2) Install the AEM water electrolysis hydrogen production CCM or MEA on the electrolyzer, and replace the initial pair ions with OH- through online in-situ activation. -This method introduces the initial displaced ions into the reactant (1M KOH) solution, where they accumulate as the displacement progresses, impacting performance during subsequent AEM water electrolysis. Furthermore, this method is only suitable for Cl... - Or HCO3 - This can directly react with OH - AEM membrane undergoing ion replacement. When the initial pair of ions is I... - At that time, OH - Unable to directly use I - It is displaced from the AEM membrane. A KCl solution of a certain concentration is required; first, I... - Ion replacement with Cl - Then replace the activation solution with 1M KOH solution, and add Cl... - Ion replacement with OH - In this case, online in-situ activated AEM water electrolysis for hydrogen production CCM or MEA is not applicable. Utility Model Content

[0005] The present invention aims to overcome at least one defect (deficiency) of the prior art and provide an offline activation device for water electrolysis membrane electrodes to improve the activation efficiency of membrane electrodes.

[0006] This utility model provides an offline activation device for an electrolytic water membrane electrode, comprising: an alkaline solution storage tank, a non-alkaline solution storage tank, a pure water storage tank, and several membrane electrode activation units.

[0007] The membrane electrode activation unit includes a cathode chamber and an anode chamber. When the membrane electrode is activated, it is placed between the cathode chamber and the anode chamber. Both the cathode chamber and the anode chamber include an outlet and an inlet.

[0008] The inlet of the cathode chamber is connected to a cathode liquid inlet pipe. The end of the cathode liquid inlet pipe away from the cathode chamber is connected to an alkaline liquid storage tank through an alkaline liquid inlet branch. The end of the cathode liquid inlet pipe away from the cathode chamber is also connected to a non-alkaline liquid storage tank through a non-alkaline liquid inlet branch.

[0009] The outlet of the cathode chamber is connected to an alkaline solution outlet branch and a non-alkaline solution outlet branch. The end of the alkaline solution outlet branch away from the cathode chamber is connected to an alkaline solution storage tank, and the end of the non-alkaline solution outlet branch away from the cathode chamber is connected to a non-alkaline solution storage tank.

[0010] The pure water storage tank is connected to the inlet of the anode chamber through an anode inlet pipe and to the outlet of the anode chamber through an anode outlet pipe.

[0011] An alkali inlet valve is provided on the alkali inlet branch; a non-alkali inlet valve is provided on the non-alkali inlet branch; an alkali outlet valve is provided on the alkali outlet branch; a non-alkali outlet valve is provided on the non-alkali outlet branch; and an anode inlet valve is provided on the anode inlet pipe.

[0012] In this technical solution, the valves mentioned all control the on / off state of the corresponding pipelines. In actual activation applications, the non-alkaline solution storage tank can be a chlorine solution storage tank. Water from the pure water storage tank enters the anode chamber through the anode inlet pipeline, while an alkaline or non-alkaline solution, such as chlorine solution, is introduced into the cathode chamber. Due to the concentration difference between the liquids in the cathode and anode chambers, ions in the solution in the cathode chamber diffuse towards the anode chamber, thereby displacing the ions in the membrane electrode placed between the two chambers.

[0013] When the membrane electrode needs to be replaced first, I - At this time, the alkali inlet valve and alkali outlet valve can be closed, and the non-alkali inlet valve and non-alkali outlet valve can be opened to allow Cl to flow into the cathode chamber first. - After the replacement is complete, close the non-alkali inlet valve and the non-alkali outlet valve, and open the alkali inlet valve and the alkali outlet valve to allow alkali solution to flow into the cathode chamber for replacement, thereby replacing all the initial ions in the membrane electrode with OH-. - This allows I to be achieved within the same activation device. - Replacement with other initial ions, without needing to replace I in other devices. - Then activation is performed, which improves the activation efficiency.

[0014] The membrane electrode activation unit can be one, three, or five, depending on the actual number of membrane electrodes to be activated, facilitating batch activation. This solution eliminates the need to change the size of the membrane electrode activation unit based on the number of membrane electrodes, thus simplifying the membrane electrode activation operation, improving activation efficiency, and offering high flexibility and applicability.

[0015] Furthermore, the membrane electrode activation unit is horizontally arranged, and the cathode chamber is located above the anode chamber.

[0016] In this technical solution, the membrane electrode activation unit is horizontally arranged, that is, the membrane electrode is placed horizontally in the unit. Ions in the liquid in the cathode chamber can diffuse not only towards the anode chamber through the concentration difference, but also towards the anode chamber below through gravity, which improves the efficiency of ion replacement.

[0017] Furthermore, one end of the cathode inlet pipe near the cathode chamber is connected to a cathode outlet pipe, and a cathode outlet valve is provided on the cathode outlet pipe;

[0018] An anode drain pipe is provided at one end of the anode inlet pipe near the anode chamber, and an anode drain valve is provided on the anode drain pipe.

[0019] In this technical solution, the drainage pipeline facilitates the discharge of waste liquid from the anode and cathode. When the liquid in the pipeline is contaminated, it is also convenient to discharge the contaminated liquid as soon as possible, so as to avoid the contaminated liquid affecting the subsequent use of the activation device.

[0020] Furthermore, a cathode pump is provided on the cathode inlet pipeline, and the cathode pump is located on the side of the alkali inlet valve near the cathode chamber. An anode pump is provided on the anode inlet pipeline, and the anode inlet valve is located on the side of the anode pump near the pure water storage tank.

[0021] In this technical solution, the installation of the cathode pump and the anode pump can increase the delivery speed of the liquid in the corresponding pipeline, thereby further improving the activation efficiency.

[0022] Furthermore, a first repair valve is provided on the cathode inlet pipe, which is located between the cathode pump and the cathode chamber; a second repair valve is provided on the anode inlet pipe, which is located between the anode pump and the anode chamber; and a third repair valve is provided on the anode outlet pipe, which is located between the pure water storage tank and the anode chamber.

[0023] In this technical solution, when the cathode pump malfunctions and requires repair, the first repair valve and the alkali inlet valve can be closed, thus separating the cathode pump from the circulation system before repair. This setup eliminates the need to drain the entire circulation system before repair, greatly simplifying maintenance. Similarly, the second repair valve, in conjunction with the anode inlet valve, can improve the maintenance efficiency of the anode pump, and the third repair valve, in conjunction with the anode inlet valve, can improve the maintenance efficiency of the pure water storage tank.

[0024] Furthermore, the membrane electrode activation unit includes a cathode plate and an anode plate, the edges of which are detachably connected, and a sealed cavity is formed between the anode plate and the cathode plate; when the membrane electrode is activated, the periphery of the membrane electrode is clamped between the cathode plate and the anode plate, the membrane electrode and the cathode plate enclose a cathode chamber, the interior of which is a cathode cavity, and the membrane electrode and the anode plate enclose an anode chamber, the interior of which is an anode cavity.

[0025] In this technical solution, the edge of the membrane electrode should be understood as the edge that avoids the active region; that is, the part sandwiched between the anode plate and the cathode plate is the inactive region of the membrane electrode. The membrane electrode divides the cavity between the anode plate and the cathode plate into an anode cavity and a cathode cavity. The opening and inlet of the anode cavity are preferably located on opposite sides of the anode plate, and the opening and inlet of the cathode cavity are preferably located on opposite sides of the cathode plate.

[0026] Furthermore, the height of the cathode cavity is 10–300 mm, and the height of the anode cavity is 20–400 mm.

[0027] In this technical solution, if the height of the cathode cavity is too small, the AEM water electrolysis membrane electrode will absorb water and swell during the activation process, reducing the space for alkali flow and thus decreasing the amount of alkali available for activation, thereby reducing the activation efficiency. Furthermore, an insufficient height can easily lead to the AEM water electrolysis membrane electrode swelling and blocking the alkali outlet, resulting in increased pressure in the alkali chamber on the cathode side, posing a risk of damaging the activated AEM water electrolysis membrane electrode and causing alkali leakage. Conversely, if the height of the cathode cavity is too large, the demand for alkali will increase, raising costs. Additionally, the alkali flow rate within the alkali chamber will decrease, causing a concentration gradient to form on the membrane electrode surface, thus reducing the activation efficiency.

[0028] Preferably, the height of the cathode cavity is 50–200 mm. This height fully considers both the increased thickness caused by water absorption and swelling of the AEM water electrolysis film electrode during activation and the balance between activation efficiency and economic efficiency.

[0029] When the cathode chamber is located above the anode chamber, the membrane electrode is placed horizontally. Its middle part will naturally shift downward under the action of gravity, which will result in a greater height difference between the anode plate and the membrane electrode to be activated. That is, the height of the anode chamber needs to be higher to avoid the membrane electrode blocking the water outlet after absorbing water and swelling. This will prevent the pressure in the anode chamber from increasing and causing leakage. Preferably, the height of the anode chamber is 100-300 mm.

[0030] Furthermore, the offline activation device includes at least two membrane electrode activation units, which are stacked vertically; the cathode chambers of two adjacent membrane electrode activation units are connected, and the anode chambers of two adjacent membrane electrode activation units are connected.

[0031] In this technical solution, when the offline activation device includes multiple membrane electrode activation units, the inlet pipe and outlet pipe are preferably connected to the uppermost membrane electrode activation unit and the lowermost membrane electrode activation unit.

[0032] Furthermore, the cathode plates and anode plates of two adjacent membrane electrode activation units are snap-fitted together.

[0033] In this technical solution, the stability between the membrane electrode activation units is improved by a snap-fit ​​connection, ensuring smooth activation. Specifically, the cathode plate has a protrusion, and the anode plate has a matching recess. The protrusion of the cathode plate on the membrane electrode activation unit and the recess of the anode plate of the activation unit above it are matched and connected, thereby fixing the two activation units relative to each other.

[0034] Furthermore, a concentration detector is connected to the anode inlet pipe.

[0035] In this technical solution, the concentration detector is used to detect the ion concentration of the liquid in the anode inlet pipeline. When it exceeds a certain standard value, the pure water is replaced in a timely manner to ensure the activation efficiency. In addition, the detector can also serve as a basis for diagnosing faults such as whether the AEM water electrolysis membrane electrode is damaged.

[0036] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0037] (1) This utility model can achieve I in the same activation device. - Replacement with other initial ions, without needing to replace I in other devices. - Then activation is performed, which improves the activation efficiency.

[0038] (2) The membrane electrode activation unit of this utility model can be set according to the actual number of membrane electrodes to be activated, which facilitates batch activation. This solution does not require changing the size of the membrane electrode activation unit according to the number of membrane electrodes, which simplifies the membrane electrode activation operation, improves the activation efficiency, and the activation device has high flexibility and applicability.

[0039] (3) This invention drives ion diffusion through the dual effects of concentration difference and gravity, thereby improving activation efficiency. Attached Figure Description

[0040] Figure 1 This is a cross-sectional view of an offline activation device with one membrane electrode activation unit.

[0041] Figure 2 This is a cross-sectional view of a stack of multiple membrane electrode activation units.

[0042] Reference numerals: Alkali storage tank 100, Non-alkali storage tank 200, Pure water storage tank 300, Membrane electrode activation unit 400, Cathode chamber 410, Anode chamber 420, Membrane electrode 430, Cathode inlet pipe 500, Alkali inlet branch 510, Alkali inlet valve 511, Non-alkali inlet branch 520, Non-alkali inlet valve 521, Cathode drain pipe 530, Cathode drain valve 531, Cathode pump 540, etc. Repair valve 550, alkaline solution outlet branch 600, non-alkaline solution outlet branch 610, non-alkaline solution outlet valve 611, alkaline solution outlet valve 620, cathode outlet pipeline 630, anode inlet pipeline 700, anode outlet pipeline 710, anode drain pipeline 720, anode drain valve 721, anode pump 730, second repair valve 740, third repair valve 750, anode inlet valve 760, concentration detector 770. Detailed Implementation

[0043] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product; it is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0044] Example 1

[0045] refer to Figure 1 This embodiment discloses an offline activation device for a water electrolysis membrane electrode, characterized in that it includes: an alkaline solution storage tank 100, a non-alkaline solution storage tank 200, a pure water storage tank 300, and several membrane electrode activation units 400. Each membrane electrode activation unit 400 includes a cathode chamber 410 and an anode chamber 420. When the membrane electrode 430 is activated, it is placed between the cathode chamber 410 and the anode chamber 420. Both the cathode chamber 410 and the anode chamber 420 include an outlet and an inlet. The inlet of the cathode chamber 410 is connected to a cathode inlet pipe 500. One end of the cathode inlet pipe 500 away from the cathode chamber 410 is connected to the alkaline solution storage tank 100 via an alkaline solution inlet branch pipe 510. The other end of the cathode inlet pipe 500 away from the cathode chamber 410 is also connected to the non-alkaline solution storage tank 200 via a non-alkaline solution inlet branch pipe 520. The outlet of the cathode chamber 410 is connected to an alkaline solution outlet branch 600 and a non-alkaline solution outlet branch 610. The end of the alkaline solution outlet branch 600 away from the cathode chamber 410 is connected to an alkaline solution storage tank 100, and the end of the non-alkaline solution outlet branch 610 away from the cathode chamber 410 is connected to a non-alkaline solution storage tank 200. The pure water storage tank 300 is connected to the inlet of the anode chamber 420 through the anode inlet pipe 700 and to the outlet of the anode chamber 420 through the anode outlet pipe 710. An alkaline solution inlet valve 511 is provided on the alkaline solution inlet branch 510. A non-alkaline solution inlet valve 521 is provided on the non-alkaline solution inlet branch 520. An alkaline solution outlet valve 620 is provided on the alkaline solution outlet branch 600. A non-alkaline solution outlet valve 611 is provided on the non-alkaline solution outlet branch 610. An anode inlet valve 760 is provided on the anode inlet pipe 700. A concentration detector 770 is connected to the anode inlet pipe 700.

[0046] For example, the pipe diameters corresponding to the outlets and inlets on the cathode chamber 410 and the anode chamber 420 are 1 / 4 inch. Both the alkali outlet branch 600 and the non-alkali outlet branch 610 are connected to the outlet of the cathode chamber 410 via a cathode outlet pipe 630.

[0047] To improve activation efficiency, the membrane electrode activation unit 400 is horizontally arranged, and the cathode chamber 410 is located above the anode chamber 420.

[0048] To facilitate drainage, the cathode inlet pipe 500 is connected to a cathode drain pipe 530 at one end near the cathode chamber 410, and a cathode drain valve 531 is provided on the cathode drain pipe 530; the anode inlet pipe 700 is connected to an anode drain pipe 720 at one end near the anode chamber 420, and an anode drain valve 721 is provided on the anode drain pipe 720. For example, both the cathode drain valve 531 and the anode drain valve 721 are manual valves for convenient drainage control.

[0049] To facilitate the control of the pipeline flow, a cathode pump 540 is provided on the cathode inlet pipeline 500, and the cathode pump 540 is located on the side of the alkali inlet valve 511 near the cathode chamber 410; an anode pump 730 is provided on the anode inlet pipeline 700, and the anode inlet valve 760 is located on the side of the anode pump 730 near the pure water storage tank 300.

[0050] For ease of repair, a first repair valve 550 is provided on the cathode inlet pipe 500, which is located between the cathode pump 540 and the cathode chamber 410; a second repair valve 740 is provided on the anode inlet pipe 700, which is located between the anode pump 730 and the anode chamber 420; and a third repair valve 750 is provided on the anode outlet pipe 710, which is located between the pure water storage tank 300 and the anode chamber 420.

[0051] The membrane electrode activation unit 400 includes a cathode plate and an anode plate, whose edges are detachably connected, forming a sealed cavity between them. For example, the edges of the cathode and anode plates are secured with multiple bolts, which are positioned away from the membrane electrode 430. The bolt torque range is 2–10 N*m, preferably 3 N*m. Insufficient torque will result in incomplete sealing, causing liquid leakage from the cathode chamber 410 and anode chamber 420 after activation begins, leading to decreased activation efficiency and increased risk of safety accidents such as alkali leakage. Excessive torque will cause deformation of the AEM water electrolysis membrane electrode 430, damaging its structure and resulting in activation failure.

[0052] When the membrane electrode 430 is activated, its four edges are clamped between the cathode plate and the anode plate, forming a cathode chamber 410. The cathode chamber 410 contains a cathode cavity. The membrane electrode 430 and the anode plate form an anode chamber 420, which contains an anode cavity. The height of the cathode cavity is 10–300 mm, and the height of the anode cavity is 20–400 mm. For example, the height of the cathode cavity is 150 mm, and the height of the anode cavity is 250 mm. The membrane electrode 430 to be activated has a size of 25 cm. 2 .

[0053] refer to Figure 2 In some embodiments, the offline activation device includes at least two membrane electrode activation units 400, which are stacked vertically. The cathode chambers 410 of adjacent membrane electrode activation units 400 are connected by pipelines, and the anode chambers 420 of adjacent membrane electrode activation units 400 are also connected by pipelines. When the offline activation device includes multiple membrane electrode activation units 400, the inlet and outlet pipelines are preferably connected to the uppermost and lowermost membrane electrode activation units 400. Further, as a preferred embodiment, the cathode inlet pipeline 500 is connected to the inlet of the uppermost cathode chamber 410, and the alkaline solution outlet branch 600 and the non-alkaline solution outlet branch 610 are connected to the outlet of the lowermost cathode chamber 410; the anode inlet pipeline 700 is connected to the inlet of the uppermost anode chamber 420, and the anode outlet pipeline 710 is connected to the outlet of the lowermost anode chamber 420.

[0054] For a secure connection, the cathode and anode plates of two adjacent membrane electrode activation units 400 are snap-fitted together. Specifically, the cathode plate has a protrusion, and the anode plate has a matching recess. The protrusion of the cathode plate on the membrane electrode activation unit matches and connects with the recess of the anode plate of the activation unit above it, thereby fixing the two activation units relative to each other.

[0055] As an example, one way to use the above-mentioned offline activation device is as follows:

[0056] Solution addition: Add 1M KOH alkali solution to alkali storage tank 100 to 4 / 5 of the total tank volume; add 3M KCl to non-alkali storage tank 200 to 4 / 5 of the total tank volume; add pure water to anode pure water storage tank 300 to 4 / 5 of the total volume.

[0057] Cl - Initial ion replacement. Open the cathode inlet valve, non-alkali inlet valve 521, and non-alkali outlet valve 611; start the cathode pump 540 and adjust the flow rate to 200 mL / min; open the anode inlet valve 760 and the anode outlet valve; start the anode pump 730 and adjust the flow rate to 200 mL / min; keep all other valves closed. Maintain at room temperature for 3 hours.

[0058] OH - Ion replacement Cl - Ions. Continue to close the non-alkali inlet valve 521, open the alkali inlet valve 511, and maintain at room temperature for 15 minutes; open the alkali outlet valve, close the non-alkali outlet valve, and maintain at room temperature for 3 hours.

[0059] After activation is complete, stop the cathode pump 540, open the cathode drain valve 531 to drain the circulating alkaline solution on the cathode side. Close the alkaline solution inlet valve 511 and the alkaline solution outlet valve 620. Open the non-alkaline solution inlet valve 521 and the non-alkaline solution outlet valve 611 to drain the non-alkaline solution. Connect the anode drain pipe 720 to the inlet pipe of the cathode chamber 410, open the anode drain valve 721, and pump pure water into the cathode chamber 410 for cleaning. After cleaning, the pure water is discharged from the cathode drain pipe.

[0060] As an example, another way to use the above-mentioned offline activation device is as follows:

[0061] Solution addition. Add 1M KOH alkali solution to alkali storage tank 100 to 4 / 5 of the total tank volume; add pure water to anode pure water storage tank 300 to 4 / 5 of the total volume.

[0062] OH - Initial ion replacement. Open the cathode inlet and outlet valves, start the cathode pump 540, and adjust the flow rate to 200 mL / min; open the anode inlet valve 760 and outlet valve, start the anode pump 730, and adjust the flow rate to 200 mL / min. Keep all other valves closed. Maintain at room temperature for 3 hours.

[0063] After activation is complete, stop the cathode pump 540, open the cathode drain valve 531, and drain the circulating alkaline solution on the cathode side. Connect the anode drain pipe 720 to the inlet pipe of the cathode chamber 410, open the anode drain valve 721, and pump pure water into the cathode chamber 410 for cleaning. After cleaning, the pure water is discharged from the cathode drain pipe.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An offline activation device for an electrolytic water membrane electrode, characterized in that, include: Alkali solution storage tank, non-alkali solution storage tank, pure water storage tank, and several membrane electrode activation units. The membrane electrode activation unit includes a cathode chamber and an anode chamber. When the membrane electrode is activated, it is placed between the cathode chamber and the anode chamber. Both the cathode chamber and the anode chamber include an outlet and an inlet. The inlet of the cathode chamber is connected to a cathode liquid inlet pipe. The end of the cathode liquid inlet pipe away from the cathode chamber is connected to an alkaline liquid storage tank through an alkaline liquid inlet branch. The end of the cathode liquid inlet pipe away from the cathode chamber is also connected to a non-alkaline liquid storage tank through a non-alkaline liquid inlet branch. The outlet of the cathode chamber is connected to an alkaline solution outlet branch and a non-alkaline solution outlet branch. The end of the alkaline solution outlet branch away from the cathode chamber is connected to an alkaline solution storage tank, and the end of the non-alkaline solution outlet branch away from the cathode chamber is connected to a non-alkaline solution storage tank. The pure water storage tank is connected to the inlet of the anode chamber through an anode inlet pipe and to the outlet of the anode chamber through an anode outlet pipe. An alkali inlet valve is provided on the alkali inlet branch; a non-alkali inlet valve is provided on the non-alkali inlet branch; an alkali outlet valve is provided on the alkali outlet branch; a non-alkali outlet valve is provided on the non-alkali outlet branch; and an anode inlet valve is provided on the anode inlet pipe.

2. The offline activation device for the water electrolysis membrane electrode according to claim 1, characterized in that, The membrane electrode activation unit is horizontally arranged, and the cathode chamber is located above the anode chamber.

3. The offline activation device for the water electrolysis membrane electrode according to claim 1, characterized in that, The cathode inlet pipe is connected to a cathode outlet pipe at one end near the cathode chamber, and a cathode outlet valve is provided on the cathode outlet pipe; An anode drain pipe is provided at one end of the anode inlet pipe near the anode chamber, and an anode drain valve is provided on the anode drain pipe.

4. The offline activation device for the water electrolysis membrane electrode according to claim 1, characterized in that, A cathode pump is installed on the cathode inlet pipeline, and the cathode pump is located on the side of the alkali inlet valve near the cathode chamber. An anode pump is installed on the anode inlet pipeline, and the anode inlet valve is located on the side of the anode pump near the pure water storage tank.

5. The offline activation device for the water electrolysis membrane electrode according to claim 4, characterized in that, The cathode inlet pipeline is equipped with a first repair valve, which is located between the cathode pump and the cathode chamber. A second repair valve is provided on the anode inlet pipeline, and the second repair valve is located between the anode pump and the anode chamber; A third repair valve is provided on the anode outlet pipeline, and the third repair valve is located between the pure water storage tank and the anode chamber.

6. The offline activation device for the water electrolysis membrane electrode according to any one of claims 1 to 5, characterized in that, The membrane electrode activation unit includes a cathode plate and an anode plate, the edges of which are detachably connected, and a sealed cavity is formed between the anode plate and the cathode plate. When the membrane electrode is activated, the membrane electrode is sandwiched between the cathode plate and the anode plate at its four edges. The membrane electrode and the cathode plate enclose a cathode chamber, and the inside of the cathode chamber is the cathode cavity. The membrane electrode and the anode plate enclose an anode chamber, and the inside of the anode chamber is the anode cavity.

7. The offline activation device for the water electrolysis membrane electrode according to claim 6, characterized in that, The height of the cathode cavity is 10–300 mm, and the height of the anode cavity is 20–400 mm.

8. The offline activation device for the water electrolysis membrane electrode according to claim 6, characterized in that, The offline activation device includes at least two membrane electrode activation units, which are stacked vertically; the cathode chambers of two adjacent membrane electrode activation units are connected, and the anode chambers of two adjacent membrane electrode activation units are connected.

9. The offline activation device for the water electrolysis membrane electrode according to claim 8, characterized in that, The cathode and anode plates of two adjacent membrane electrode activation units are snapped together.

10. The offline activation device for the water electrolysis membrane electrode according to claim 6, characterized in that, A concentration detector is connected to the anode inlet pipe.

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