System component
By introducing hydrogen tanks and multiple valves into the electrolytic reactor system, additional hydrogen is provided to the electrolytic reactor, which solves the problems of uneven aging of electrolytic cells and oxide formation, extends the service life of the electrolytic device and improves stability.
Patent Information
- Application Number
- CN202420741703.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-04-11
- Filing Date
- 2024-04-11
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-04-11
AI Technical Summary
The electrolytic cell is uneven in operation due to manufacturing tolerances and fluctuations in operation, especially due to oxide formation caused by temperature differences and uneven oxygen/hydrogen supply, and the catalyst layer deteriorates.
By introducing hydrogen tanks and multiple valves into the system components, additional hydrogen is provided to the anode and cathode region of the electrolyte stack for restoring the operating capacity of the electrolytic cell, reducing degradation, and filling hydrogen during shutdown to prevent oxide formation.
It effectively extends the service life of the electrolytic device, reduces the degradation of the electrolytic cell, prevents the formation of oxides and the degradation of the catalyst layer, and improves the stability and reliability of the system.
Smart Images
Figure CN222684785U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a system component with an electrolysis stack. Such a system component is used, for example, for electrolysis of water. In addition, the utility model relates to a method for regenerating the electrolysis stack of such a system component and a method for shutting down the electrolysis stack of such a system component.
[0002] A preferred field of application of the present invention is the generation of hydrogen. Background Art
[0003] For example, hydrogen can be produced by means of electrolysis.
[0004] The electrolysis takes place in an electrolytic cell / electrolyser of an electrolytic device, which is also called an electrolytic stack. In practice, a plurality of electrolytic cells are electrically connected in series and combined into a cell stack. The cell stack forms an electrolytic device. A plurality of cell stacks or electrolytic devices can be combined into an electrolytic plant.
[0005] The electrolytic cells connected in series to form a stack are loaded with the same current during operation, but age to different degrees. The reasons for this may be production tolerances and / or fluctuations during operation, for example due to temperature differences and / or differences in the oxygen or hydrogen supply to the individual electrolytic cells. Utility Model Content
[0006] In comparison, the system assembly according to the present invention has the following advantages: by coupling the hydrogen tank, the working capacity of the electrolysis cell can be restored or the degradation of the electrolysis cell can be minimized.
[0007] For this purpose, the system component has an electrolysis stack. The electrolysis stack has an anode region and a cathode region, wherein the anode region comprises a water inlet channel and a water outlet channel, and the cathode region comprises a hydrogen outlet channel. In addition, a hydrogen tank is arranged downstream of the hydrogen outlet, and the hydrogen tank has a multi-way valve.
[0008] The stored hydrogen can thus be used in a structurally simple manner for a recovery strategy in which the hydrogen is to be reduced in oxides, or the stored hydrogen can also be used in the anode region and / or cathode region after a shutdown of the electrolyzer in order to prevent oxidation there by diffused air. In particular, degradation of the catalyst layer due to oxide formation is prevented in this case.
[0009] In a first advantageous embodiment, it is provided that the multi-way valve can be connected via an inlet line of the anode region to a water inlet channel and / or a water outlet channel of the anode region of the electrolysis stack and / or to a hydrogen outlet channel of the cathode region of the electrolysis stack.
[0010] In an advantageous embodiment, it is provided that the multi-way valve can be connected to the cathode region of the electrolysis stack via an inlet channel.
[0011] In this way, both the anode region and also the cathode region of the electrolysis stack can be supplied with additional hydrogen in a constructively simple manner.
[0012] In a further embodiment of the invention, it is advantageously provided that the cathode region comprises a water inflow channel. Thus, the service life of the electrolysis device can be increased, in which a recovery process for the electrolysis stack can be initiated via the water inflow channel. The recovery process is a real reversal of the electrolysis operation in order to promote the elimination of oxygen and other oxides which accumulate as by-products in the anode region and / or cathode region of the electrolysis stack, in particular in the individual electrolysis cells.
[0013] In an advantageous embodiment, it is provided that the multi-way valve can be connected to a hydrogen consumer system, preferably via a hydrogen tank system.
[0014] In a further embodiment of the invention, it is advantageously provided that the hydrogen consumer system is a fuel cell system or a hydrogen internal combustion engine system.
[0015] In an advantageous embodiment, it is provided that the electrolysis stack is a PEM (Proton Exchange Membrane, German: Protonen-Austausch-Membran) electrolysis stack or an AEM (Anion Exchange Membrane, English: Anion Exchange Membrane, German: Anionen-Austausch-Membran) electrolysis stack.
[0016] In an advantageous embodiment, the system components may be used for the electrolysis of water.
[0017] In addition, the utility model relates to a method for regenerating an electrolytic stack of the above-mentioned system components, wherein, in order to dissolve oxygen and / or oxides, in particular catalyst oxides, in the electrolytic stack, hydrogen is flushed into the water inlet channel and / or water outlet channel of the anode region of the electrolytic stack and / or into the hydrogen outlet channel and / or inlet channel of the cathode region of the electrolytic stack via a multi-way valve outside of normal operation. Thus, outside of normal operation, i.e. when no hydrogen is produced, the electrolytic stack can be fully filled (fluted) with hydrogen in order to treat the electrolytic stack as evenly as possible. Thus, the introduced hydrogen can react with oxygen and other oxides, in particular catalyst oxides and platinum oxides, and remove them from the electrolytic stack.
[0018] The invention also relates to a method for shutting down an electrolysis stack of the above-mentioned system component, wherein, in order to prevent the formation of oxides, the anode region and / or cathode region of the electrolysis stack is filled with hydrogen. Thus, the formation of oxides can be prevented because the electrolysis stack remains stationary in hydrogen. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] An embodiment of the system assembly according to the present invention is shown in the accompanying drawings.
[0020] Figure 1 A possible exemplary embodiment of a system arrangement according to the invention with an electrolysis stack and a hydrogen tank is shown in a schematic illustration. DETAILED DESCRIPTION
[0021] Figure 1 A possible exemplary embodiment of a system component 1 according to the invention is shown in a schematic illustration.
[0022] The system component 1 has an electrolysis stack 100, which can be implemented as a PEM (proton exchange membrane, English: Proton-Exchange Membrane, German: Protonen-Austausch-Membran) electrolysis stack or an AEM (anion exchange membrane, English: Anion-Exchange Membrane, German: Anionen-Austausch-Membran) electrolysis stack. The electrolysis stack 100 includes an anode region 101 and a cathode region 102. The anode region 101 has a water inlet channel 2 and a water outlet channel 9, while the cathode region 102 has an inlet channel 7 and a hydrogen outlet channel 10, which is preferably used for hydrogen, but can also be used for water.
[0023] A hydrogen tank 6 is arranged downstream of the hydrogen outlet 10, and the hydrogen tank has a multi-way valve 5. A small amount of hydrogen is stored in the hydrogen tank 6, which is used for the recovery strategy or for the shutdown process.
[0024] The multi-way valve 5 can be connected to the water inlet channel 2 and / or the water outlet channel 9 of the anode region 101 of the electrolysis stack 100 via the inlet pipe 8. In addition, the multi-way valve 5 can be connected to the hydrogen outlet channel 10 of the cathode region 102 of the electrolysis stack 100 and / or the inlet channel 7 of the cathode region 102.
[0025] Furthermore, the cathode region 102 has a water inlet channel 3. In an alternative embodiment, this water inlet channel can also be omitted.
[0026] Furthermore, the multi-way valve 5 can be connected to a hydrogen consumer system 15, preferably via a hydrogen tank system 14. The hydrogen consumer system 15 can be, for example, a fuel cell system or a hydrogen internal combustion engine system.
[0027] Therefore, the electrolysis stack 100 is supplied with hydrogen via the hydrogen tank 6 , which can be used for the recovery process and / or the shutdown process.
[0028] Here, the utility model relates to a method for regenerating an electrolysis stack 100 of the above-mentioned system component 1, wherein, in order to dissolve oxygen and / or oxides, especially catalyst oxides, in the electrolysis stack 100, hydrogen is flushed into the water inlet channel 2 and / or water outlet channel 9 of the anode region 101 of the electrolysis stack 100 and / or flushed into the hydrogen outlet channel 10 and / or inlet channel 7 of the cathode region 102 of the electrolysis stack 100 via a multi-way valve 5 outside normal operation. Outside normal operation refers to when hydrogen is not produced. For example, the electrolysis stack 100 can be operated in a fuel cell mode, that is, in this operating mode, hydrogen is not produced, but consumed. Thus, hydrogen can be provided to the electrolysis stack 100 via a hydrogen tank 6, and the hydrogen reacts with oxygen and other oxides in the electrolysis stack 100. Here, hydrogen is flushed through the anode region 101 and / or cathode region 102 of the electrolysis stack 100 so that hydrogen can react with oxygen and other oxides, and the other oxides are especially catalyst oxides and platinum oxides. Here, hydrogen is flushed into the water inlet channel 2 and the water outlet channel 9 of the anode region 101 of the electrolysis stack 100 via the multi-way valve 5, and flushed into the hydrogen outlet channel 10 and the inlet channel 7 of the cathode region 102 of the electrolysis stack 100. It can thus be ensured that the electrolysis cells of the electrolysis stack 100 are treated as evenly as possible.
[0029] Furthermore, the present invention relates to a method for shutting down an electrolysis stack 100 of the above-mentioned system component 1 , wherein the anode region 101 and / or the cathode region 102 of the electrolysis stack 100 is filled with hydrogen in order to prevent oxide formation.
[0030] When the electrolysis stack 100 is shut down, the anode region 101 and the cathode region 102 of the electrolysis stack 100 are therefore filled with hydrogen in order to prevent oxide formation, since the electrolysis stack 100 remains shut down in hydrogen.
[0031] The system component 1 can be used, for example, for the electrolysis of water.
Claims
1. A system component (1) for the electrolysis of water, comprising an electrolysis stack (100), the electrolysis stack (100) having an anode region (101) and a cathode region (102), wherein: The anode region (101) comprises a water inlet channel (2) and a water outlet channel (9), and the cathode region (102) comprises a hydrogen outlet channel (10), characterized in that a hydrogen tank (6) is arranged downstream of the hydrogen outlet channel (10), and the hydrogen tank has a multi-way valve (5).
2. The system component (1) according to claim 1, characterized in that The multi-way valve (5) can be connected to the water inlet channel (2) and / or the water outlet channel (9) of the anode region (101) of the electrolysis stack (100) via the inlet pipeline (8) of the anode region (101) and / or to the hydrogen outlet channel (10) of the cathode region (102) of the electrolysis stack (100).
3. The system component (1) according to claim 1 or 2, characterized in that The multi-way valve (5) can be connected to the cathode region (102) of the electrolysis stack (100) via an inlet channel (7).
4. The system component (1) according to claim 1 or 2, characterized in that The cathode region (102) includes a water inflow channel (3).
5. System component (1) according to claim 1 or 2, characterized in that The multi-way valve (5) can be connected to a hydrogen consumer system (15).
6. System component (1) according to claim 5, characterized in that The hydrogen consumer system (15) is a fuel cell system or a hydrogen internal combustion engine system.
7. System component (1) according to claim 1 or 2, characterized in that The electrolysis stack (100) is a PEM electrolysis stack or an AEM electrolysis stack.
8. The system component (1) according to claim 5, characterized in that The multi-way valve (5) can be connected to a hydrogen consumer system (15) via a hydrogen tank system (14).