Water electrolysis hydrogen production test system

Abstract

The utility model belongs to the field of hydrogen production by water electrolysis, and discloses a test system for hydrogen production by water electrolysis, which comprises a direct current power supply, a hydrogen separator, an oxygen separator, a plurality of hydrogen side ball valves, a plurality of oxygen side ball valves and a plurality of liquid inlet valves, the direct-current power supply comprises a plurality of power supply channels; each power supply channel is electrically connected with one electrolytic cell; the plurality of hydrogen side ball valves are respectively arranged on the hydrogen sides of the plurality of electrolytic cells, the plurality of oxygen side ball valves are respectively arranged on the oxygen sides of the plurality of electrolytic cells, and the plurality of liquid inlet valves are respectively arranged on liquid inlet pipelines of the plurality of electrolytic cells; the plurality of hydrogen side ball valves are connected with an inlet pipeline of the hydrogen separator through a hydrogen public pipeline, and the plurality of oxygen side ball valves are connected with an inlet pipeline of the oxygen separator through an oxygen public pipeline; a liquid outlet of the hydrogen separator and a liquid outlet of the oxygen separator are respectively connected with a plurality of liquid inlet valve pipelines through a liquid inlet public pipeline. According to the utility model, independent control of the single electrolytic cell can be realized, and test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water electrolysis hydrogen production, in particular to a water electrolysis hydrogen production testing system. Background Art

[0002] The water electrolysis hydrogen production route is currently the most commonly used process route for industrial hydrogen production. In related technologies, the water electrolysis hydrogen production system usually includes an electrolyzer and auxiliary systems. The auxiliary systems include hydrogen separators, oxygen separators, power distribution cabinets, pumps, valves, etc. Traditional hydrogen production systems generally equip one electrolyzer with one set of auxiliary systems (such as patents CN220413534U and CN116815243A, etc.). This "one-to-one" mode of one electrolyzer with one set of auxiliary systems can only control one electrolyzer at a time, and the test system is inefficient and costly. Therefore, a test scheme has emerged in which multiple electrolyzers correspond to one set of auxiliary systems. However, in this scheme, a single electrolyzer cannot be controlled independently. When an electrolyzer fails or needs to be replaced, the entire system needs to be shut down, and the test process will be interrupted, affecting the test efficiency. Utility Model Content

[0003] The purpose of this application is to provide a water electrolysis hydrogen production testing system that can achieve independent control of a single electrolytic cell and improve testing efficiency.

[0004] The technical solutions provided in this application are as follows:

[0005] A water electrolysis hydrogen production test system is used to test multiple electrolyzers of the same type, including a DC power supply, a hydrogen separator, an oxygen separator, multiple hydrogen-side ball valves, multiple oxygen-side ball valves, and multiple liquid inlet valves;

[0006] The DC power supply includes a plurality of independent power supply channels, each of which is used to be electrically connected to one of the electrolytic cells;

[0007] The plurality of hydrogen-side ball valves are respectively provided on the hydrogen side of the plurality of electrolyzers, the plurality of oxygen-side ball valves are respectively provided on the oxygen side of the plurality of electrolyzers, and the plurality of liquid inlet valves are respectively provided on the liquid inlet pipelines of the plurality of electrolyzers; the plurality of hydrogen-side ball valves are connected to the inlet pipeline of the hydrogen separator through a hydrogen common pipeline, and the plurality of oxygen-side ball valves are connected to the inlet pipeline of the oxygen separator through an oxygen common pipeline;

[0008] The liquid outlet of the hydrogen separator and the liquid outlet of the oxygen separator are respectively connected to the plurality of liquid inlet pipelines through a common liquid inlet pipeline.

[0009] In some embodiments, the gas outlet of the hydrogen separator is in communication with the atmosphere, and the gas outlet of the oxygen separator is in communication with the atmosphere.

[0010] In some embodiments, a plurality of drain valves are further included, and the plurality of drain valves are respectively disposed on the liquid inlet pipelines of the plurality of electrolytic cells.

[0011] In some embodiments, a variable pump is further included, and the variable pump is provided on the common liquid inlet pipeline to control the flow on the common liquid inlet pipeline.

[0012] In some embodiments, a heater is further included, which is disposed on the common liquid inlet pipe and is used to heat the liquid in the common liquid inlet pipe.

[0013] In some embodiments, the housing of the hydrogen separator and the housing of the oxygen separator are respectively provided with scale lines; and / or the hydrogen separator and the housing of the oxygen separator are respectively provided with thermometers.

[0014] In some embodiments, a water tank and a water supply valve are further included. The water tank is connected to the hydrogen separator through a pipeline, and the water supply valve is provided on the pipeline connecting the water tank and the hydrogen separator.

[0015] In some embodiments, the internal flow field structures of the plurality of electrolytic cells are respectively the same or different;

[0016] The electrodes of the plurality of electrolytic cells are respectively the same or different;

[0017] The diaphragms of the plurality of electrolytic cells are respectively the same or different;

[0018] The input currents of the plurality of electrolytic cells are respectively the same or different.

[0019] In some embodiments, the temperatures of the electrolytes in the plurality of electrolytic cells are respectively the same;

[0020] The concentrations of the electrolytes in the plurality of electrolytic cells are the same.

[0021] In some embodiments, the power supply channel includes a voltage electrolysis mode and a current electrolysis mode, and the voltage electrolysis mode and the current electrolysis mode are switchable.

[0022] The technical effect of this application is that each electrolytic cell is connected to the same DC power supply through an independent power supply channel, which can realize independent adjustment and separate disassembly of the electrolytic cell. When disassembling a certain electrolytic cell, it will not affect the normal operation of other electrolytic cells, thereby improving testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0024] Figure 1 This is a structural diagram of a water electrolysis hydrogen production test system provided in a specific embodiment of the present application;

[0025] Figure 2 This is a process flow chart of a water electrolysis hydrogen production test system provided in a specific embodiment of the present application.

[0026] Description of Figure Numbers:

[0027] 10. DC power supply; 11. Power supply channel; 12. Display screen; 20. Hydrogen separator; 30. Oxygen separator; 40. Electrolyzer; 41. Hydrogen side ball valve; 42. Oxygen side ball valve; 43. Liquid inlet valve; 44. Drain valve; 50. Water tank; 60. Water supply valve; 70. Variable pump; 80. Heater; 90. Thermometer. DETAILED DESCRIPTION

[0028] In the following description, specific details such as specific system structures and technologies are provided for illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obstructing the description of the present application with unnecessary details.

[0029] In order to more clearly illustrate the application embodiments or technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive efforts.

[0030] To simplify the drawings, only the parts relevant to this application are schematically shown in each figure. They do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0031] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0032] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application.

[0033] In the embodiments shown in the drawings, directional indications (such as up, down, left, right, front, and back, etc.) are not absolute but relative when describing the structure and movement of each component, and are not used to limit the direction of the product in actual use.

[0034] In addition, in the description of this application, ordinal numbers, such as "first", "second", etc., are only used to distinguish and describe related objects, and cannot be understood as indicating or implying the relative importance or order between related objects.

[0035] According to the specific embodiments provided in this application, Figure 1 and Figure 2 As shown, a water electrolysis hydrogen production test system is used to test multiple electrolyzers 40 of the same type. The water electrolysis hydrogen production test system includes a DC power supply 10, a hydrogen separator 20, an oxygen separator 30, multiple hydrogen-side ball valves 41, multiple oxygen-side ball valves 42, and multiple liquid inlet valves 43. The DC power supply 10 includes multiple power supply channels 11, which are independent of each other. Each power supply channel 11 can independently control and adjust the output voltage to meet the needs of different loads or equipment. Each electrolyzer 40 is electrically connected to one of the power supply channels 11. Multiple hydrogen-side ball valves 41 are respectively provided on the hydrogen side of the multiple electrolyzers 40 and connected to the inlet pipeline of the hydrogen separator 20 through a hydrogen common pipeline. Multiple oxygen-side ball valves 42 are respectively provided on the oxygen side of the multiple electrolyzers 40 and connected to the inlet pipeline of the oxygen separator 30 through an oxygen common pipeline. Multiple liquid inlet valves 43 are respectively provided on the liquid inlet pipelines of the multiple electrolyzers 40 , and the liquid outlet of the hydrogen separator 20 and the liquid outlet of the oxygen separator 30 are respectively connected to the multiple liquid inlet valves 43 through a common liquid inlet pipeline.

[0036] Specifically, the electrolysis water hydrogen production test system is equipped with N electrolytic cells 40, N ≥ 1. A hydrogen-side ball valve 41 is installed on the hydrogen side of each electrolytic cell 40, an oxygen-side ball valve 42 is installed on the oxygen side of each electrolytic cell 40, and an inlet valve 43 is installed below each electrolytic cell 40. The inlet valve 43 of each electrolytic cell 40 is connected to a common inlet pipe, which is connected to the liquid outlet of the hydrogen separator 20 and the liquid outlet of the oxygen separator 30 to transport the electrolyte in the hydrogen separator 20 and the oxygen separator 30 to each electrolytic cell 40. The temperature and concentration of the electrolyte in each electrolytic cell 40 are the same. During the test, the opening of each inlet valve 43 is reasonably adjusted to ensure that the electrolyte flow rate in each electrolytic cell 40 is consistent.

[0037] The hydrogen-side ball valve 41 of each electrolyzer 40 is connected to the hydrogen common pipeline, and the oxygen-side ball valve 42 of each electrolyzer 40 is connected to the oxygen common pipeline. After the electrolyte enters each electrolyzer 40 for electrolysis, the generated hydrogen gas is collected by the hydrogen-side ball valve 41 and then enters the hydrogen common pipeline. The hydrogen gas then enters the hydrogen separator 20 through the hydrogen common pipeline for gas-liquid separation. The hydrogen gas can be collected through the outlet of the hydrogen separator 20, or the outlet of the hydrogen separator 20 is connected to the atmosphere and discharged into the atmosphere through the outlet of the hydrogen separator 20. The electrolyte is delivered to each electrolyzer 40 through the liquid inlet common pipeline. The generated oxygen is collected by the oxygen-side ball valve 42 and fed into the oxygen common pipeline. It then enters the oxygen separator 30 through the oxygen common pipeline for gas-liquid separation. The oxygen can be collected through the gas outlet of the oxygen separator 30, or the gas outlet of the oxygen separator 30 is connected to the atmosphere, whereupon the oxygen is discharged into the atmosphere through the gas outlet of the oxygen separator 30. The electrolyte is delivered to each electrolyzer 40 through the liquid common pipeline. In this embodiment, when the gas outlets of the hydrogen separator 20 and the oxygen separator 30 are respectively connected to the atmosphere, the hydrogen and oxygen generated by electrolysis enter the separators for gas-liquid separation before being discharged into the atmosphere. Both the hydrogen separator 20 and the oxygen separator 30 are at atmospheric pressure, eliminating the need for a pressure sensor and simplifying the overall system structure. In addition, the liquid outlets of the hydrogen separator 20 and the oxygen separator 30 are connected through a common liquid inlet pipeline, and the pressures in the hydrogen separator 20 and the oxygen separator 30 are equal, which can ensure that the liquid levels of the hydrogen separator 20 and the oxygen separator 30 are equal. In this way, the pressures of the hydrogen separator 20 and the oxygen separator 30 are the same, thereby keeping the flow rates of the hydrogen separator 20 and the oxygen separator 30 consistent.

[0038] The water electrolysis hydrogen production test system is also equipped with a DC power supply 10. The type of DC power supply 10 is not limited. In this embodiment, the input voltage of the DC power supply 10 is 220V. The DC power supply 10 includes multiple independent power supply channels 11. Each power supply channel 11 can be set to two constant current / constant voltage adjustment modes, namely voltage electrolysis mode and current electrolysis mode. The voltage electrolysis mode and current electrolysis mode are switchable. Each power supply channel 11 can independently power an electrolyzer 40 and can independently adjust the voltage or current of each electrolyzer 40. A display screen 12 can be provided on the DC power supply 10 to display the operating status of each electrolyzer 40 controlled by the DC power supply 10, such as the real-time electrolysis current and corresponding electrolysis voltage of each electrolyzer 40, and store operating data. There is no limit on the number of power supply channels 11. The number of power supply channels 11 is greater than or equal to the number of electrolyzers 40 to achieve simultaneous power supply to all electrolyzers 40. When it is necessary to replace a particular electrolytic cell 40 in the system, the DC power supply 10 can be controlled to cut off power to that cell 40 and close the liquid inlet valve 43 of that cell 40. The electrolytic cell 40 can then be removed. This removal process does not affect the normal operation of the remaining electrolytic cells 40. Furthermore, as long as there are sufficient power supply channels 11, the system can readily increase the number of working electrolytic cells 40. Installing a new electrolytic cell 40 does not affect the normal operation of the remaining electrolytic cells 40.

[0039] The DC power supply 10 of this embodiment can independently control multiple electrolytic cells 40 by providing multiple independent power supply channels 11. When a certain electrolytic cell 40 needs to be replaced, it is only necessary to cut off the power supply of the electrolytic cell 40 for disassembly. The entire disassembly process will not affect the normal operation of other electrolytic cells 40, the system does not need to be shut down, and the test process will not be interrupted, thereby improving the test efficiency. In addition, the hydrogen separator 20 and the oxygen separator 30 of this embodiment are both connected to the atmosphere. The hydrogen separator 20 and the oxygen separator 30 are in a normal pressure state during the test process, and there is no need to set a pressure sensor, which can simplify the system structure and reduce the test cost.

[0040] In some embodiments, as Figure 1 and Figure 2As shown, the system further includes a water tank 50 and a water replenishment valve 60. The water tank 50 is connected to the hydrogen separator 20 via a pipeline, and the water replenishment valve 60 is installed on the pipeline connecting the water tank 50 and the hydrogen separator 20. Electrolyte is replenished from the water tank 50 through the water replenishment valve 60 into the hydrogen separator 20, and the corresponding electrolyte is replenished according to the type of electrolyzer 40. For strong-base hydrogen production electrolyzers (alkaline electrolyzers, ALK), the replenished electrolyte is a potassium hydroxide solution with a mass fraction of 27-32%. For weak-base hydrogen production electrolyzers (anion exchange membrane electrolyzers, AEM), the replenished electrolyte is a potassium hydroxide solution with a mass fraction of 5%. For pure water production electrolyzers (proton exchange membrane electrolyzers, PEM), the replenished electrolyte is pure water with a conductivity of ≤0.1ms / m.

[0041] It should be noted that the internal structures of the electrolyzers 40 required to be tested by the electrolysis water hydrogen production test system may be different, but the types must be the same. That is, the multiple electrolyzers connected to the system at the same time are all of the same type, such as all electrolyzers are ALK (strong alkaline hydrogen production electrolyzer), or all electrolyzers are PEM (pure water electrolyzer), or all electrolyzers are AEM (weak alkaline hydrogen production electrolyzer). If different types of electrolyzers need to be tested, multiple tests need to be performed, selecting one type of electrolyzer for each test, and testing another type of electrolyzer after one type of electrolyzer has completed the test.

[0042] The internal structures of the electrolytic cells 40 may be different in any one or more of the internal flow field structure, electrodes, or diaphragms of the electrolytic cells 40. Furthermore, the input current or voltage of each electrolytic cell 40 may be the same or different.

[0043] In some embodiments, as Figure 1 As shown, the system further includes multiple drain valves 44, which are arranged on the liquid inlet pipelines of the multiple electrolytic cells 40. When a certain electrolytic cell 40 needs to be repaired or replaced, the power supply to this electrolytic cell 40 is cut off, the liquid inlet valve 43, hydrogen-side ball valve 41, and oxygen-side ball valve 42 of this electrolytic cell 40 are closed, and then the electrolyte in the electrolytic cell 40 is drained through the drain valve 44. Then, the electrolytic cell 40 is disassembled, which reduces the difficulty of disassembly and improves the efficiency of disassembly. The normal operation of the other electrolytic cells 40 is not affected during the disassembly process.

[0044] In some embodiments, as Figure 1As shown, the water electrolysis hydrogen production test system further includes a variable pump 70, which is provided on the liquid inlet common pipeline and is used to control the flow rate on the liquid inlet common pipeline. A variable pump 70 is connected to N electrolytic cells 40, and the flow rate of the variable pump 70 and the opening of the liquid inlet valve 43 can be adjusted according to the number of operating electrolytic cells 40 to ensure that the electrolyte flow rate in each electrolytic cell 40 is evenly distributed. Since the liquid outlets of the hydrogen separator 20 and the oxygen separator 30 are connected through a common liquid inlet pipeline, the electrolyte in each electrolytic cell 40 comes from the same common liquid inlet pipeline, so that the electrolyte temperature and concentration in each electrolytic cell 40 are the same. Compared with a variable pump connected to one electrolytic cell, its temperature and concentration may change. The test results of the one-to-many test system of this embodiment are more accurate. At the same time, since the electrolyte in each electrolytic cell 40 comes from the same common liquid inlet pipeline, only one variable pump 70 needs to be set on the common liquid inlet pipeline, and there is no need to set a variable pump 70 at the liquid outlet of the hydrogen separator 20 and the oxygen separator 30 to control the flow rate, which simplifies the structure of the test system and reduces production costs.

[0045] In some embodiments, as Figure 1 and Figure 2 As shown, the water electrolysis hydrogen production test system also includes a heater 80, which is disposed on the common liquid inlet pipe and is used to heat the liquid in the common liquid inlet pipe. Heater 80 can heat the electrolyte in the common liquid inlet pipe, reducing the cold start time of electrolyzer 40, thereby shortening the test cycle.

[0046] In some embodiments, scale lines are provided on the housing of hydrogen separator 20 and oxygen separator 30. Providing scale lines on the housings of hydrogen separator 20 and oxygen separator 30 allows for replenishing electrolyte according to scale changes, eliminating the need for a level gauge and simplifying the structure of the entire testing system.

[0047] In some embodiments, as Figure 1 and Figure 2As shown, the water electrolysis hydrogen production test system also includes a thermometer 90; the thermometer 90 is provided on each of the hydrogen separator 20 and the oxygen separator 30. Each of the hydrogen separator 20 and the oxygen separator 30 is equipped with a thermometer 90 for measuring the temperature of the electrolyte in the hydrogen separator 20 and the oxygen separator 30. Different types of electrolytic cells 40 have different electrolyte temperatures. For the strong base hydrogen production electrolyzer (alkaline electrolyzer, ALK), the temperature of the electrolyte in the hydrogen separator 20 and the oxygen separator 30 is maintained at 80-90°C; for the weak base hydrogen production electrolyzer (anion exchange membrane electrolyzer, AEM), the temperature of the electrolyte in the hydrogen separator 20 and the oxygen separator 30 is maintained at 60-90°C; for the pure water production electrolyzer (proton exchange membrane electrolyzer, PEM), the temperature of the electrolyte in the hydrogen separator 20 and the oxygen separator 30 is maintained at 50-85°C. This hydrogen production test system is equipped with a temperature control system to monitor and control the electrolyte temperature in real time to keep it within the control range.

[0048] The connection and startup process of the water electrolysis hydrogen production test system is as follows:

[0049] 1. Connect the water electrolysis hydrogen production test system to all electrolyzers 40 to be tested. It should be noted that during the same test process, the internal structures of all electrolyzers 40 to be tested can be different, but the types must be the same. That is, the electrolyzers 40 connected to the system at the same time are all of the same type (ALK, PEM or AEM);

[0050] 2. Close the drain valves 44 of all electrolytic cells 40, and open the hydrogen-side ball valves 41, oxygen-side ball valves 42, and liquid inlet valves 43 of all electrolytic cells 40. Open the water supply valve 60 below the water tank 50, and add the electrolyte required by the electrolytic cells 40 to the hydrogen separator 20. Turn on the variable pump 70 to fill each electrolytic cell 40 with electrolyte. The electrolyte is then transported to the oxygen separator 30 through the common liquid inlet pipeline until the liquid level meets the control requirements.

[0051] 3. When the electrolyte fills all the electrolytic cells 40, turn on the DC power supply 10 to supply power to all the electrolytic cells 40 simultaneously;

[0052] 4. The system operates at normal pressure. Gas outlets are located above the hydrogen separator 20 and the oxygen separator 30. The liquid level balance in the two separators is controlled by the communicating vessel principle. The electrolyte is replenished through the water supply valve 60 of the water tank 50, and the electrolyte temperature in the hydrogen separator 20 and the oxygen separator 30 is monitored in real time.

[0053] The calculation formula for hydrogen production of a single electrolyzer 40 is:

[0054] Q = (nI × 22.4 × 3.6) / 2F;

[0055] Where Q is the hydrogen production of a single electrolyzer, in Nm 3 / h; n is the number of cells in the electrolytic cell; I is the electrolysis current in A; and F is the Faraday constant, which is 96485 C / mol. The input current, i.e., the electrolysis current, of each electrolytic cell 40 can be calculated based on the preset hydrogen production rate. The input current of each electrolytic cell 40 to be tested can be the same or different. After inputting the current, the corresponding electrolysis voltage of each electrolytic cell 40 can be obtained. By comparing the electrolysis voltages, the efficiency of the electrolytic cell 40 can be determined. Generally speaking, the lower the electrolysis voltage, the higher the efficiency of the electrolytic cell 40.

[0056] The present water electrolysis hydrogen production test system can simultaneously test electrolytic cells 40 with different structures and different numbers of chambers. The following example illustrates the adjustment process of the electrolytic cell 40:

[0057] Example 1: There are 5 electrolytic cells 40. For ease of explanation, the 5 electrolytic cells 40 are respectively marked as electrolytic cell 1, electrolytic cell 2, electrolytic cell 3, electrolytic cell 4, and electrolytic cell 5. Electrolytic cell 1, electrolytic cell 2, electrolytic cell 3, electrolytic cell 4, and electrolytic cell 5 all have 10 electrolytic chambers. Taking electrolytic cell 4 as a reference, the anode of electrolytic cell 1 is foamed nickel, the cathode is a nickel mesh sprayed with Raney nickel catalyst, the diaphragm is a PPS material, and the main electrode plate is a papillary structure. The cathode material of electrolytic cell 2 is different from that of electrolytic cell 1 (the cathode of electrolytic cell 2 uses a multi-element alloy catalyst or a precious metal catalyst, etc.); the anode material of electrolytic cell 3 is different from that of electrolytic cell 1 (the anode of electrolytic cell 3 uses a nickel mesh or foamed nickel loaded with a catalyst, etc.), the diaphragm material of electrolytic cell 4 is different from that of electrolytic cell 1 (the diaphragm of electrolytic cell 4 uses a composite diaphragm, etc.), and the plate type (flow field structure) of electrolytic cell 5 is different from that of electrolytic cell 1. The remaining components of electrolytic cell 2, electrolytic cell 3, electrolytic cell 4, and electrolytic cell 5 are the same as those of electrolytic cell 1.

[0058] By controlling the DC power supply 10 to supply power to the five electrolytic cells, the current input of each electrolytic cell is controlled to be 24-48A (corresponding to a hydrogen production of 0.1-0.2Nm 3 / h). The DC power supply 10 can read the total electrolysis voltage of each electrolytic cell and the electrolysis voltage of each electrolytic cell under the input current. By comparing the electrolysis voltage of each electrolytic cell, the advantages and disadvantages of the electrode, diaphragm selection and flow channel design can be confirmed, thereby achieving the test purpose.

[0059] Example 2: Similarly, the number of electrolytic cells 40 is 5, and electrolytic cell 1, electrolytic cell 2, and electrolytic cell 3 all have 10 electrolytic chambers. Taking electrolytic cell 1 as a reference, the cathode of electrolytic cell 2 is different from that of electrolytic cell 1 (the rest of the structures and components are the same), and the anode of electrolytic cell 3 is different from that of electrolytic cell 1 (the rest of the structures and components are the same). Electrolytic cells 4 and electrolytic cells 5 have 20 electrolytic chambers. Taking electrolytic cell 1 as a reference, the internal structure of electrolytic cell 4 is exactly the same as that of electrolytic cell 1, and the flow field structure of electrolytic cell 5 is different from that of electrolytic cell 1, while the rest are the same. The five electrolytic cells are powered by controlling the DC power supply 10, and the input current of electrolytic cell 1, electrolytic cell 2, and electrolytic cell 3 is adjusted to 24-48A (corresponding to a hydrogen production of 0.1-0.2Nm 3 / h), the input current of electrolyzer 4 and electrolyzer 5 is 12-24A (corresponding to hydrogen production of 0.1-0.2Nm 3 / h). The electrolysis voltage corresponding to each electrolytic cell under the input current can be read by the DC power supply 10. Under the same electrolysis current, the lower the average cell voltage of the electrolytic cell, the higher the electrolysis efficiency.

[0060] The disassembly and installation process of the electrolyzer of the water electrolysis hydrogen production test system is as follows:

[0061] When the system is operating normally and a certain electrolytic cell (such as electrolytic cell 3) needs to be disassembled, the disassembly and installation process is as follows:

[0062] On the premise of ensuring power supply to the remaining electrolyzers, cut off the power input of electrolyzer 3, close the hydrogen side ball valve and oxygen side ball valve of electrolyzer 3, cut off the electrolyte supply of electrolyzer 3, and control the variable pump to reduce the flow output to ensure that the flow of the remaining electrolyzers remains unchanged; open the drain valve under electrolyzer 3 to drain the electrolyte; remove electrolyzer 3, and keep the remaining electrolyzers in normal operation; after the fault of electrolyzer 3 is handled, keep the original hydrogen side ball valve, oxygen side ball valve and drain valve closed, and reinstall electrolyzer 3 to the hydrogen production test system; after the installation of electrolyzer 3 is completed, on the premise of ensuring the normal operation of the remaining electrolyzers, keep the drain valve closed, open the hydrogen side ball valve and oxygen side ball valve of electrolyzer 3, and control the variable pump 70 to increase the flow output to ensure that the flow of each electrolyzer is consistent after the installation of electrolyzer 3 is completed; when the electrolyzer 3 is full of electrolyte, the DC power supply is energized for it, and the system operates normally.

[0063] The water electrolysis hydrogen production test system in the above embodiment has the following technical effects:

[0064] 1. Each electrolytic cell is connected to the same DC power supply through an independent power supply channel, which enables independent adjustment and separate disassembly of the electrolytic cell. When disassembling a certain electrolytic cell, it will not affect the normal operation of other electrolytic cells, thereby improving test efficiency and test cost. In addition, N electrolytic cells with different structures can be tested simultaneously.

[0065] 2. The water electrolysis hydrogen production test system has high compatibility and can simultaneously meet the testing requirements of strong alkaline hydrogen production electrolyzers (alkaline electrolyzers, ALK), weak alkaline hydrogen production electrolyzers (anion exchange membrane electrolyzers, AEM) or pure water hydrogen production electrolyzers (proton exchange membrane electrolyzers, PEM).

[0066] 3. The test system can increase the number of working electrolytic cells at any time. When installing a new electrolytic cell, the system does not need to be shut down and will not affect the normal operation of other electrolytic cells.

[0067] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0068] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications should also be considered as the scope of protection of the present application.

Claims

1. A water electrolysis hydrogen production test system, used to test multiple electrolyzers of the same type, characterized in that: It includes a DC power supply, a hydrogen separator, an oxygen separator, a plurality of hydrogen-side ball valves, a plurality of oxygen-side ball valves and a plurality of liquid inlet valves; The DC power supply includes a plurality of independent power supply channels, each of which is electrically connected to one of the electrolytic cells; The plurality of hydrogen-side ball valves are respectively provided on the hydrogen side of the plurality of electrolyzers, the plurality of oxygen-side ball valves are respectively provided on the oxygen side of the plurality of electrolyzers, and the plurality of liquid inlet valves are respectively provided on the liquid inlet pipelines of the plurality of electrolyzers; the plurality of hydrogen-side ball valves are connected to the inlet pipeline of the hydrogen separator through a hydrogen common pipeline, and the plurality of oxygen-side ball valves are connected to the inlet pipeline of the oxygen separator through an oxygen common pipeline; The liquid outlet of the hydrogen separator and the liquid outlet of the oxygen separator are respectively connected to the plurality of liquid inlet pipelines through a common liquid inlet pipeline.

2. A water electrolysis hydrogen production test system according to claim 1, characterized in that: The gas outlet of the hydrogen separator is communicated with the atmosphere, and the gas outlet of the oxygen separator is communicated with the atmosphere.

3. A water electrolysis hydrogen production test system according to claim 1, characterized in that: It also includes a plurality of drain valves, which are respectively arranged on the liquid inlet pipelines of the plurality of electrolytic cells.

4. A water electrolysis hydrogen production test system according to claim 1, characterized in that: It also includes a variable pump, which is arranged on the common liquid inlet pipeline and is used to control the flow on the common liquid inlet pipeline.

5. A water electrolysis hydrogen production test system according to claim 4, characterized in that: It also includes a heater, which is arranged on the liquid inlet common pipeline and is used to heat the liquid in the liquid inlet common pipeline.

6. A water electrolysis hydrogen production test system according to claim 1, characterized in that: The housing of the hydrogen separator and the housing of the oxygen separator are respectively provided with scale lines; and / or the hydrogen separator and the housing of the oxygen separator are respectively provided with thermometers.

7. A water electrolysis hydrogen production test system according to claim 1, characterized in that: It also includes a water tank and a water supply valve. The water tank is connected to the hydrogen separator through a pipeline, and the water supply valve is arranged on the pipeline connecting the water tank and the hydrogen separator.

8. A water electrolysis hydrogen production testing system according to any one of claims 1 to 7, characterized in that: The internal flow field structures of the plurality of electrolytic cells are respectively the same or different; The electrodes of the plurality of electrolytic cells are respectively the same or different; The diaphragms of the plurality of electrolytic cells are respectively the same or different; The input currents of the plurality of electrolytic cells are respectively the same or different.

9. A water electrolysis hydrogen production test system according to claim 8, characterized in that: The temperatures of the electrolytes in the plurality of electrolytic cells are respectively the same; The concentrations of the electrolytes in the plurality of electrolytic cells are the same.

10. A water electrolysis hydrogen production testing system according to any one of claims 1 to 7, characterized in that: The power supply channel includes a voltage electrolysis mode and a current electrolysis mode, and the voltage electrolysis mode and the current electrolysis mode are switchable.

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