Hydrogen production system and control method of hydrogen production system

Abstract

The invention discloses a hydrogen production system and a control method of the hydrogen production system, and relates to the technical field of hydrogen production. The hydrogen production system comprises at least two electrolytic cells arranged in parallel, a gas-liquid separator, a gas blow-down pipe, a liquid discharge pipe, a liquid storage tank and a control valve group; a gas inlet / outlet of the electrolytic cell is communicated with a mixture inlet of the gas-liquid separator through a first pipeline; a liquid outlet of the gas-liquid separator is communicated with a liquid inlet / outlet of the electrolytic cell through a second pipeline; each gas inlet and outlet is communicated with a gas blow-down pipe; each liquid inlet / outlet is also communicated with a liquid discharge pipe; the liquid discharge pipe is also communicated with a liquid storage tank; the control valve group can control the first pipeline and the second pipeline to circulate and control the gas blow-down pipe and the liquid discharge pipe to be cut off; or the control valve group can control the first pipeline and the second pipeline to be cut off and the gas blow-down pipe and the liquid discharge pipe to be communicated. According to the hydrogen production system provided by the invention, at least one electrolytic cell can be independently cut out without influencing the normal operation of other parts of the hydrogen production system.

Description

Technical Field

[0001] This application relates to the field of hydrogen production technology, and in particular to a hydrogen production system and a control method for the hydrogen production system. Background Technology

[0002] In large-scale hydrogen production systems, multiple electrolyzers are typically connected in parallel to a gas-liquid separation unit. When one or more electrolyzers malfunction, the entire system must be shut down for repair, resulting in a waste of production capacity. Summary of the Invention

[0003] The main purpose of this application is to propose a hydrogen production system and a control method for the hydrogen production system, which aims to improve the problem that in large-scale hydrogen production systems, the entire system needs to be shut down before one or more electrolyzers can be inspected and maintained.

[0004] To achieve the above objectives, the hydrogen production system proposed in this application includes:

[0005] An electrolytic cell, wherein at least two electrolytic cells are connected in parallel, and the electrolytic cell has a gas inlet / outlet and a liquid inlet / outlet;

[0006] A gas-liquid separator having a mixture inlet and a liquid outlet, wherein the gas inlet and outlet are connected to the mixture inlet via a first pipe, and the liquid outlet is connected to the liquid inlet and outlet via a second pipe;

[0007] A gas venting pipe is provided, and each of the electrolytic cells is connected to the gas inlet and outlet of the gas venting pipe. The end of the gas venting pipe away from the gas inlet and outlet is connected to the outside.

[0008] The liquid discharge pipe is also connected to the liquid inlet and outlet of each electrolytic cell;

[0009] The liquid storage tank, and the liquid discharge pipe is also connected to the liquid storage tank; and

[0010] A control valve assembly is provided, wherein the control valve assembly is capable of controlling both the first and second pipes to be in a flowing state, and both the gas vent pipe and the liquid discharge pipe to be in a closed state; or, the control valve assembly is capable of controlling both the first and second pipes to be in a closed state, and both the gas vent pipe and the liquid discharge pipe to be in a flowing state.

[0011] In one embodiment, the hydrogen production system further includes a gas buffer tank, which is disposed on the gas vent pipe.

[0012] In one embodiment, the hydrogen production system further includes a nitrogen source, which is connected to the gas buffer tank via a third pipeline.

[0013] In one embodiment, the nitrogen source is connected to the gas inlet / outlet via a fourth pipe, and the control valve assembly can also control the fourth pipe to be in a flowing or closed state.

[0014] In one embodiment, the gas vent pipe is also provided with a sight glass.

[0015] In one embodiment, the hydrogen production system further includes a power pump located on the liquid discharge pipe.

[0016] In one embodiment, the liquid discharge pipe includes a first sub-pipe and a second sub-pipe, the first sub-pipe being connected to the liquid inlet and outlet, and the second sub-pipe being connected to the liquid storage tank; the inlet end of the power pump is connected to a first connecting pipe and a second connecting pipe, the first connecting pipe also being connected to the first sub-pipe, and the second connecting pipe also being connected to the second sub-pipe; the outlet end of the power pump is connected to a third connecting pipe and a fourth connecting pipe, the third connecting pipe and the fourth connecting pipe being connected to the first sub-pipe and the second sub-pipe, respectively; the control valve assembly can also control the connection between the first connecting pipe and the fourth connecting pipe; or control the connection between the second connecting pipe and the third connecting pipe.

[0017] In one embodiment, the gas inlet and outlet include a hydrogen outlet and an oxygen outlet, and the gas vent pipe includes a hydrogen vent pipe and an oxygen vent pipe, wherein the hydrogen vent pipe and the oxygen vent pipe are respectively connected to the hydrogen outlet and the oxygen outlet.

[0018] The hydrogen vent pipe and the oxygen vent pipe are respectively equipped with a first pressure gauge and a second pressure gauge; the control valve group includes a regulating valve, which is located on the hydrogen vent pipe; the hydrogen production system also includes a differential pressure gauge, the first pressure gauge and the second pressure gauge are both electrically connected to the differential pressure gauge, and the differential pressure gauge is also electrically connected to the regulating valve.

[0019] In one embodiment, the storage tank is connected to a level gauge.

[0020] This application also proposes a control method for the hydrogen production system described above, the control method for the hydrogen production system comprising:

[0021] Obtain the operating status of the electrolytic cell;

[0022] When at least one of the electrolytic cells is found to be in a fault state, the electrolytic cell in the fault state is controlled to be in an unstarted state, and the first pipe and the second pipe connected to the electrolytic cell in the fault state are both controlled to be in a shut-off state.

[0023] Control the discharge of gas from the electrolytic cell;

[0024] The liquid discharge pipe is kept in a flow state.

[0025] Obtain the current discharge status of the electrolytic cell;

[0026] When the current drainage status is stopped, the gas inlet / outlet and the liquid discharge pipe in the electrolytic cell are both kept in a non-flowing state.

[0027] In one embodiment, the step of controlling the gas discharge from the electrolytic cell specifically includes:

[0028] The gas vent pipe is kept in a flowing state.

[0029] In one embodiment, the gas inlet and outlet of the hydrogen production system includes a hydrogen outlet and an oxygen outlet; the gas vent pipe includes a hydrogen vent pipe and an oxygen vent pipe, which are respectively connected to the hydrogen outlet and the oxygen outlet; a first pressure gauge and a second pressure gauge are respectively provided on the hydrogen vent pipe and the oxygen vent pipe; the control valve group includes a regulating valve, which is located on the hydrogen vent pipe; the hydrogen production system also includes a differential pressure gauge, and both the first pressure gauge and the second pressure gauge are electrically connected to the differential pressure gauge, which is also electrically connected to the regulating valve; after the step of controlling the gas vent pipe to be in a flowing state, the system further includes:

[0030] Obtain the current value of the differential pressure gauge, compare the current value with a preset value range, and generate a comparison result;

[0031] Adjust the opening degree of the regulating valve according to the comparison results.

[0032] In one embodiment, the hydrogen production system further includes a nitrogen source, which is connected to the gas inlet / outlet via a fourth pipe; the step of controlling the gas discharge from the electrolyzer further includes:

[0033] The fourth pipe is controlled to be in a flow state.

[0034] In one embodiment, the hydrogen production system further includes a nitrogen source, which is connected to the gas inlet / outlet via a fourth pipe. The step of controlling the gas discharge from the electrolyzer includes:

[0035] The gas vent pipe is controlled to be in a shut-off state;

[0036] The fourth pipe is controlled to be in a flow state.

[0037] In one embodiment, the step of obtaining the current discharge status of the electrolytic cell specifically includes:

[0038] The liquid level in the storage tank is acquired in real time.

[0039] If the liquid level in the storage tank remains constant within a preset time range, then the current discharge state of the electrolytic cell is determined to be a stopped discharge state.

[0040] In one embodiment, the hydrogen production system further includes a nitrogen source, which is connected to the gas inlet / outlet via a fourth pipe; after the step of controlling both the gas inlet / outlet and the liquid discharge pipe in the electrolyzer to be in a non-flowing state when the current discharge state is stopped, the system further includes:

[0041] The fourth pipe is controlled to be in a flow state, and the sealing status of the electrolytic cell is obtained;

[0042] When the sealing condition of the electrolytic cell is found to be in a qualified sealing state, the liquid discharge pipe is controlled to be in a flow state, and the liquid in the storage tank is controlled to flow into the electrolytic cell through the liquid discharge pipe;

[0043] Obtain the liquid injection status of the electrolytic cell;

[0044] When the electrolyte cell is found to be full, the liquid discharge pipe is controlled to be in a non-flowing state.

[0045] In one embodiment, after the step of controlling the liquid discharge pipe to be in a non-flowing state when the electrolytic cell is in a full state, the method further includes:

[0046] Determine whether the current hydrogen production system meets the preset power start-up conditions of the electrolyzer;

[0047] When the preset power start-up conditions of the electrolytic cell are met, both the first and second pipes are controlled to be in a flow state.

[0048] Determine whether the liquid temperature in the second pipe has reached the preset temperature range;

[0049] When the liquid temperature in the second pipe reaches the preset temperature range, the electrolytic cell is turned on.

[0050] The technical solution of this application connects the gas inlet and outlet of each electrolytic cell to a gas vent pipe, with the end of the gas vent pipe away from the gas inlet and outlet connected to the outside. The gas outlet of the electrolytic cell is also connected to the mixture inlet of the gas-liquid separator through a first pipe. The control valve group can control the first pipe to be in a closed state and control the gas vent pipe to be in a flowing state. Thus, the gas inlet and outlet of the electrolytic cell can be selected to enter the gas vent pipe and release hydrogen or oxygen from the gas vent pipe, thereby achieving the depressurization effect of the electrolytic cell. Each electrolyzer's liquid inlet and outlet are connected to a liquid discharge pipe, which in turn connects to a storage tank. The liquid inlet and outlet of the electrolyzer are also connected to the discharge pipe of the gas-liquid separator via a second pipe. The control valve group can control the second pipe to be in a closed state and control the liquid discharge pipe to be in a flowing state. This allows the electrolyte in the electrolyzer requiring maintenance to be discharged into the storage tank through the liquid discharge pipe, thereby achieving the effect of discharging the electrolyte in the electrolyzer. Furthermore, it allows the electrolyzer that has discharged hydrogen, oxygen, and electrolyte to be independent of the gas-liquid separator and other electrolyzers connected to the gas-liquid separator. In other words, at least one electrolyzer can be isolated from other parts of the hydrogen production system and cut off independently without affecting the normal operation of other parts. This improves the problem of having to shut down the entire system to maintain one or more electrolyzers. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of the structure of an embodiment of the hydrogen production system provided in this application;

[0053] Figure 2 This is a schematic diagram of another embodiment of the hydrogen production system provided in this application;

[0054] Figure 3 A schematic diagram of another embodiment of the hydrogen production system provided in this application;

[0055] Figure 4 A schematic flowchart of an embodiment of the control method for the hydrogen production system provided in this application.

[0056] Explanation of icon numbers:

[0057] 100. Electrolytic cell; 110. Gas inlet / outlet; 120. Liquid inlet / outlet;

[0058] 200. Gas-liquid separator; 210. Hydrogen separator; 220. Oxygen separator; 201. Mixture inlet; 202. Drain outlet;

[0059] 310. First pipeline; 320. Second pipeline; 330. Third pipeline; 340. Fourth pipeline;

[0060] 400. Gas vent pipe; 410. Hydrogen vent pipe; 420. Oxygen vent pipe;

[0061] 500, Liquid discharge pipe; 510, First sub-pipe; 520, Second sub-pipe; 530, First connecting pipe; 540, Second connecting pipe; 550, Third connecting pipe; 560, Fourth connecting pipe;

[0062] 600, Control valve assembly; 610, First control valve; 620, Second control valve; 630, Third control valve; 631, Regulating valve; 640, Fourth control valve; 650, Fifth control valve; 660, Sixth control valve; 670, Seventh control valve; 680, Eighth control valve; 691, Ninth control valve; 692, Tenth control valve;

[0063] 710. Gas buffer tank; 720. Sight glass; 730. Power pump; 740. Liquid storage tank;

[0064] 810. First pressure gauge; 820. Second pressure gauge; 830. Differential pressure gauge;

[0065] 900. Level gauge.

[0066] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0067] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0068] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0069] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0070] In large-scale hydrogen production systems, multiple electrolyzers are typically connected in parallel to a gas-liquid separator. When one or more electrolyzers malfunction, the entire system must be shut down before maintenance can be carried out. This requires disconnecting the gas from the gas-liquid separator's exhaust port to allow the gas inside the electrolyzers to escape before maintenance can proceed. However, this also causes other electrolyzers to shut down, resulting in wasted production capacity.

[0071] To address the issue that large-scale hydrogen production systems require a complete shutdown before one or more electrolyzers can be inspected and repaired, this application proposes a hydrogen production system.

[0072] Please refer to the reference. Figures 1 to 3 In one embodiment of this application, the hydrogen production system includes an electrolyzer 100, a gas-liquid separator 200, a gas vent pipe 400, a liquid discharge pipe 500, a storage tank 740, and a control valve assembly 600. At least two electrolyzers 100 are connected in parallel, each having a gas inlet / outlet 110 and a liquid inlet / outlet 120. The gas-liquid separator 200 has a mixture inlet 201 and a liquid outlet 202. The gas inlet / outlet 110 is connected to the mixture inlet 201 via a first pipe 310, and the liquid outlet 202 is connected to the liquid inlet / outlet 120 via a second pipe 320. The gas inlet / outlet 110 of each electrolyzer 100 is connected to... A gas vent pipe 400 is provided, with one end of the gas vent pipe 400 away from the gas inlet / outlet 110 connected to the outside; each electrolytic cell 100's liquid inlet / outlet 120 is also connected to a liquid discharge pipe 500; the liquid discharge pipe 500 is also connected to a storage tank 740; the control valve group 600 can control both the first pipe 310 and the second pipe 320 to be in a flowing state, and both the gas vent pipe 400 and the liquid discharge pipe 500 to be in a closed state; or, the control valve group 600 can control both the first pipe 310 and the second pipe 320 to be in a closed state, and both the gas vent pipe 400 and the liquid discharge pipe 500 to be in a flowing state.

[0073] At least two electrolytic cells 100 are provided, and the two electrolytic cells 100 are arranged in parallel. When the gas inlet / outlet 110 of the electrolytic cell 100 is connected to the mixture inlet 201 of the gas-liquid separator 200, the gas discharged from different electrolytic cells 100 can enter the gas-liquid separator 200 for gas-liquid separation, and the electrolyte separated by the gas-liquid separator 200 can also flow back to the different electrolytic cells 100 through the drain port 202. In this application, the gas inlet / outlet 110 of each electrolytic cell 100 is connected to a gas vent pipe 400. It should be noted that the gas inlet / outlet 110 of each electrolytic cell 100 can discharge the gas generated in the electrolytic cell 100 to the outside, or allow external gas to flow in. Of course, in other examples, the electrolytic cell 100 may have multiple gas inlet / outlet 110s, some of which are only used for discharging the gas generated in the electrolytic cell 100 to the outside, and others are only for allowing external gas to flow in. By connecting the end of the gas vent pipe 400 away from the gas inlet / outlet 110 to the outside, the gas inlet / outlet 110 of the electrolytic cell 100 can selectively enter the gas vent pipe 400 and vent hydrogen or oxygen from the gas vent pipe 400, thereby achieving the pressure relief effect of the electrolytic cell 100. It should be noted that the end of the gas vent pipe 400 away from the gas inlet / outlet 110 needs to be located in a safe position before connecting to the outside. A safe position means that the gas vent pipe 400 is located within the requirements of safety regulations; for example, the end of the gas vent pipe 400 connected to the outside needs to be higher than the specified height and distance of the tallest building within a certain radius. Since this safety requirement is well-known to those skilled in the art, it will not be described in detail here. Specifically, the gas-liquid separator 200 may include a hydrogen separator 210 and an oxygen separator 220. When the electrolytic cell 100 is operating normally, the hydrogen produced enters the hydrogen separator 210, and the oxygen produced enters the oxygen separator 220. Each electrolytic cell 100 has a liquid inlet / outlet 120 connected to a liquid discharge pipe 500, which is also connected to a storage tank 740. This allows the electrolyte in the electrolytic cell 100 requiring maintenance to be discharged into the storage tank 740 through the liquid discharge pipe 500, thus achieving the effect of discharging the electrolyte from the electrolytic cell 100. This allows the electrolytic cell 100, after discharging hydrogen, oxygen, and electrolyte, to operate independently from other electrolytic cells 100 that do not require maintenance, while the other electrolytic cells 100 that do not require maintenance can continue to operate normally without being affected by the electrolytic cell 100 requiring maintenance. Specifically, to reduce safety hazards, two gas vent pipes 400 can be provided, one connected to the hydrogen outlet of the electrolytic cell 100 and the other connected to the oxygen outlet of the electrolytic cell 100.In this application, the gas in the electrolytic cell 100 can be discharged through the gas vent pipe 400 or by pressurization, such as by introducing nitrogen into the gas inlet / outlet 110 of the electrolytic cell 100. At the same time as the electrolyte in the electrolytic cell 100 is discharged from the liquid discharge pipe 500, the gas is also discharged from the liquid discharge pipe 500. The introduced nitrogen can reduce the concentration of hydrogen and oxygen, thereby reducing the risk of explosion caused by the mixing of hydrogen and oxygen.

[0074] In this application, by setting up a control valve group 600, when it is determined that an electrolytic cell 100 needs to be repaired, the control valve group 600 can control the gas inlet / outlet 110 of the electrolytic cell 100 to be repaired to be connected to the corresponding gas vent pipe 400, and control the liquid inlet / outlet 120 of the electrolytic cell 100 to be repaired to flow out of the electrolyte; at the same time, the gas inlet / outlet 110 of the electrolytic cell 100 to be repaired is controlled to be disconnected from the mixture inlet 201, that is, the first pipe 310 is in a closed state, and the liquid inlet / outlet 120 of the electrolytic cell 100 to be repaired is controlled to be disconnected from the drain port 202, that is, the second pipe 320 is in a closed state. Alternatively, once it is determined that an electrolytic cell 100 requires maintenance, the control valve group 600 can control the gas inlet / outlet 110 of the electrolytic cell 100 requiring maintenance to be disconnected from the corresponding gas vent pipe 400, control the liquid inlet / outlet 120 of the electrolytic cell 100 requiring maintenance to flow out of the electrolyte, and increase the gas pressure in the electrolytic cell 100 by adding nitrogen gas into the electrolytic cell 100 through the gas inlet / outlet 110. This will push the liquid in the electrolytic cell 100 out of the electrolytic cell 100 while simultaneously pushing the gas in the electrolytic cell 100 out of the electrolytic cell 100 through the liquid inlet / outlet 120. At the same time, the gas inlet / outlet 110 of the electrolytic cell 100 requiring maintenance is disconnected from the mixture inlet 201, that is, the first pipe 310 is in a closed state, and the liquid inlet / outlet 120 of the electrolytic cell 100 requiring maintenance is disconnected from the drain port 202, that is, the second pipe 320 is in a closed state. In addition, by setting up the control valve group 600, when it is determined that the electrolytic cell 100 does not require maintenance, the gas inlet / outlet 110 can be kept connected to the mixture inlet 201 of the gas-liquid separator 200, and the liquid inlet / outlet 120 can be kept connected to the liquid outlet 202 of the gas-liquid separator 200. At the same time, the control valve group 600 controls the gas vent pipe 400 corresponding to the electrolytic cell 100 that does not require maintenance to be in a closed state, and controls the liquid discharge pipe 500 corresponding to the electrolytic cell 100 that does not require maintenance to be in a closed state.

[0075] Specifically, to achieve the effect that the control valve assembly 600 can control both the first pipe 310 and the second pipe 320 to be in a flowing state, and both the gas vent pipe 400 and the liquid discharge pipe 500 to be in a closed state, or that the control valve assembly 600 can control both the first pipe 310 and the second pipe 320 to be in a closed state, and both the gas vent pipe 400 and the liquid discharge pipe 500 to be in a flowing state, the control valve assembly 600 may include a first control valve 610, a second control valve 620, a third control valve 630, and a fourth control valve 640 respectively installed on the first pipe 310, the second pipe 320, the gas vent pipe 400, and the liquid discharge pipe 500. Alternatively, the first control valve 610 and the third control valve 630 may be combined into a three-way valve or a multi-way valve, and the second control valve 620 and the fourth control valve 640 may also be combined into a three-way valve or a multi-way valve, as long as the on / off effect of controlling each pipe can be achieved.

[0076] The technical solution of this application connects the gas inlet / outlet 110 of each electrolytic cell 100 to a gas vent pipe 400, and the end of the gas vent pipe 400 away from the gas inlet / outlet 110 is connected to the outside. The gas outlet of the electrolytic cell 100 is also connected to the mixture inlet 201 of the gas-liquid separator 200 through the first pipe 310. The control valve group 600 can control the first pipe 310 to be in a closed state and control the gas vent pipe 400 to be in a flowing state. Thus, the gas inlet / outlet 110 of the electrolytic cell 100 can be selected to enter the gas vent pipe 400 and release hydrogen or oxygen from the gas vent pipe 400, thereby achieving the depressurization effect of the electrolytic cell 100. Each electrolytic cell 100 has a liquid inlet / outlet 120 connected to a liquid discharge pipe 500, which is also connected to a storage tank 740. The liquid inlet / outlet 120 of the electrolytic cell 100 is also connected to the discharge pipe of the gas-liquid separator 200 through a second pipe 320. The control valve group 600 can control the second pipe 320 to be in a closed state and control the liquid discharge pipe 500 to be in a flowing state. This allows the electrolyte in the electrolytic cell 100 that needs maintenance to be discharged into the storage tank 740 through the liquid discharge pipe 500, thereby achieving the effect of discharging the electrolyte in the electrolytic cell 100. This allows the electrolytic cell 100, after discharging hydrogen, oxygen, and electrolyte, to be independent of the gas-liquid separator 200 and other electrolytic cells 100 connected to the gas-liquid separator 200. This improves the problem of having to shut down the entire system to maintain one or more electrolytic cells 100. Of course, by controlling the valve group 600 to keep the first pipe 310 and the second pipe 320 in a flowing state, and to keep the gas vent pipe 400 and the liquid discharge pipe 500 in a closed state, the normal operation of the electrolytic cell 100 can be achieved.

[0077] In some embodiments of this application, please refer to the references Figure 1 and Figure 2 The hydrogen production system also includes a gas buffer tank 710, which is located on the gas vent pipe 400.

[0078] By installing a gas buffer tank 710 on the gas vent pipe 400, the gas discharged from the electrolytic cell 100 can be buffered in the gas buffer tank 710 and then discharged through the end of the gas vent pipe 400 away from the gas inlet / outlet 110, thereby further reducing safety hazards.

[0079] Furthermore, please refer to the following: Figure 1 and Figure 2 The hydrogen production system also includes a nitrogen source, which is connected to a gas buffer tank 710 via a third pipeline 330.

[0080] By setting up a nitrogen source, and connecting the nitrogen source to the gas buffer tank 710 via a third pipe 330, the nitrogen source can replenish nitrogen in the gas buffer tank 710, thereby reducing the mixed concentration of hydrogen and oxygen and further reducing safety hazards.

[0081] Furthermore, a ninth control valve 691 can be provided on the third pipeline 330 to control whether the third pipeline 330 is in a flowing or closed state. When the ninth control valve 691 is in the open state, nitrogen can be introduced into the gas buffer tank 710 while the electrolytic cell 100 is discharging gas into the gas buffer tank 710, thereby reducing the risk of explosion. When the electrolytic cell 100 is in normal operation or when electrolyte is being re-injected into the electrolytic cell 100, the ninth control valve 691 can be closed to prevent the nitrogen source from introducing nitrogen into the gas buffer tank 710.

[0082] Furthermore, please refer to the following: Figure 2 and Figure 3 The nitrogen source is connected to the gas inlet / outlet 110 via the fourth pipe 340, and the control valve group 600 can also control the fourth pipe 340 to be in a flowing state or a cut-off state.

[0083] By also providing a fourth pipe 340, which connects the gas inlet / outlet 110 and the nitrogen source, the nitrogen source can directly supply nitrogen to the gas inlet / outlet 110 through the fourth pipe 340. This increases the gas pressure inside the electrolytic cell 100 and provides good power for the electrolyte to flow from the electrolytic cell 100 to the liquid discharge pipe 500, or even to the storage tank 740. On the other hand, it also allows at least a portion of the gas inside the electrolytic cell 100 to be discharged outside the electrolytic cell 100 along with the electrolyte through the liquid discharge pipe 500.

[0084] Furthermore, a tenth control valve 692 may be provided on the fourth pipe 340 to control whether the fourth pipe 340 is in a flowing or closed state. Understandably, during the draining process of the electrolytic cell 100, the tenth control valve 692 can be opened to allow the nitrogen source to charge nitrogen into the electrolytic cell 100, thereby increasing the gas pressure inside the electrolytic cell 100 and pushing the electrolyte into the liquid discharge pipe 500. When the electrolytic cell 100 is in normal operation or when electrolyte is being re-injected into the electrolytic cell 100, the tenth control valve 692 can be closed to prevent the nitrogen source from charging nitrogen into the electrolytic cell 100.

[0085] In some embodiments of this application, please refer to the references Figures 1 to 3 The gas vent pipe 400 is also equipped with a sight glass 720.

[0086] Understandably, when the electrolytic cell 100, after maintenance, needs to return to normal operation, the electrolyte in the storage tank 740 needs to be returned to the electrolytic cell 100. By placing the sight glass 720 on the gas vent pipe 400, the presence or absence of electrolyte in the sight glass 720 can be used as a criterion for determining whether the electrolytic cell 100 is full. Specifically, when the user can observe the electrolyte in the sight glass 720, it can be determined that the electrolytic cell 100 is full. At this time, the control valve assembly 600 can be used to control both the first pipe 310 and the second pipe 320 to be in a flowing state, while the gas vent pipe 400 and the liquid discharge pipe 500 are both in a closed state. When the user cannot observe the electrolyte in the sight glass 720, it is determined that the electrolytic cell 100 is not yet full, and the injection process needs to continue until the electrolyte can be observed in the sight glass 720.

[0087] In some embodiments of this application, please refer to the references Figures 1 to 3 The hydrogen production system also includes a power pump 730, which is located on the liquid discharge pipe 500.

[0088] By installing a power pump 730 on the liquid discharge pipe 500, the flow rate of the electrolyte in the liquid discharge pipe 500 can be increased, and sufficient power can be provided for the electrolyte to be discharged from the electrolytic cell 100 to the storage tank 740 or for the electrolyte to be injected from the storage tank 740 into the electrolytic cell 100.

[0089] Of course, in other examples, the power pump 730 may not be installed on the liquid discharge pipe 500 of the hydrogen production system. Instead, the height of the storage tank 740 may be set lower than the liquid inlet and outlet 120 of the electrolyzer 100. The height difference between the two can be used to make the electrolyte in the electrolyzer 100 flow into the storage tank 740 automatically under the action of gravity.

[0090] Based on the above-mentioned hydrogen production system including the power pump 730, please further refer to the following: Figures 1 to 3 In some embodiments of this application, the liquid discharge pipe 500 includes a first sub-pipe 510 and a second sub-pipe 520. The first sub-pipe 510 is connected to the liquid inlet / outlet 120, and the second sub-pipe 520 is connected to the liquid storage tank 740. The inlet end of the power pump 730 is connected to a first connecting pipe 530 and a second connecting pipe 540. The first connecting pipe 530 is also connected to the first sub-pipe 510, and the second connecting pipe 540 is also connected to the second sub-pipe 520. The outlet end of the power pump 730 is connected to a third connecting pipe 550 and a fourth connecting pipe 540. The third connecting pipe 550 and the fourth connecting pipe 540 are respectively connected to the first sub-pipe 510 and the second sub-pipe 520. The control valve group 600 can also control the connection between the first connecting pipe 530 and the fourth connecting pipe 540; or control the connection between the second connecting pipe 540 and the third connecting pipe 550.

[0091] By connecting the first sub-pipe 510 of the liquid discharge pipe 500 to the liquid inlet / outlet 120, the second sub-pipe 520 to the storage tank 740, the inlet of the power pump 730 to the first connecting pipe 530 (which is also connected to the first sub-pipe 510), and the outlet of the power pump 730 to the fourth connecting pipe 540 (which is connected to the second sub-pipe 520), and by controlling the connection between the first connecting pipe 530 and the fourth connecting pipe 540 by the control valve group 600, the liquid in the electrolytic cell 100 can flow sequentially through the first sub-pipe 510, the first connecting pipe 530, the inlet of the power pump 730, the outlet of the power pump 730, the fourth connecting pipe 540, and the second sub-pipe 520 into the storage tank 740, thereby achieving the effect of discharging the liquid from the electrolytic cell 100. By connecting a second connecting pipe 540 to the inlet of the power pump 730 and a third connecting pipe 550 to the outlet of the power pump 730, with the second connecting pipe 540 connected to the second sub-pipe 520 and the third connecting pipe 550 connected to the first sub-pipe 510, and the control valve assembly 600 capable of controlling the connection between the second connecting pipe 540 and the third connecting pipe 550, the electrolyte can flow from the storage tank 740 sequentially through the second sub-pipe 520, the second connecting pipe 540, the inlet of the power pump 730, the outlet of the power pump 730, the third connecting pipe 550, and the first sub-pipe 510 back into the electrolytic cell 100. With this configuration, there is no need to change the flow direction of the electrolyte within the power pump 730; only a model of power pump 730 that drives the electrolyte flow in one direction is required.

[0092] Specifically, in order for the control valve assembly 600 to control the connection between the first connecting pipe 530 and the fourth connecting pipe 540, and to control the connection between the second connecting pipe 540 and the third connecting pipe 550, a fifth control valve 650, a sixth control valve 660, a seventh control valve 670, and an eighth control valve 680 may be respectively provided on the first connecting pipe 530, the second connecting pipe 540, the third connecting pipe 550, and the fourth connecting pipe 540. When it is necessary to discharge the electrolyte in the electrolytic cell 100 into the storage tank 740, the fifth control valve 650 and the eighth control valve 680 can be in the open state, while the sixth control valve 660 and the seventh control valve 670 can be in the closed state; when it is necessary to discharge the electrolyte in the storage tank 740 back into the electrolytic cell 100, the fifth control valve 650 and the eighth control valve 680 can be in the closed state, while the sixth control valve 660 and the seventh control valve 670 can be in the open state. Alternatively, a first switching valve is provided between the first connecting pipe 530 and the third connecting pipe 550. The first end of the first switching valve is connected to the first sub-pipe 510, the second end of the first switching valve is connected to the first connecting pipe 530, and the third end of the first switching valve is connected to the second connecting pipe 540. A second switching valve is provided between the second connecting pipe 540 and the fourth connecting pipe 540. The first end of the second switching valve is connected to the second sub-pipe 520, the second end of the second switching valve is connected to the third connecting pipe 550, and the third end of the second switching valve is connected to the fourth connecting pipe 540.

[0093] In some embodiments of this application, please refer to the references Figures 1 to 3 The gas inlet / outlet 110 includes a hydrogen outlet and an oxygen outlet, and the gas vent pipe 400 includes a hydrogen vent pipe 410 and an oxygen vent pipe 420, which are respectively connected to the hydrogen outlet and the oxygen outlet.

[0094] The gas venting pipe 400 includes a hydrogen venting pipe 410 connected to a hydrogen outlet and an oxygen venting pipe 420 connected to an oxygen outlet, which can reduce the risk of explosion caused by the mixing of hydrogen and oxygen. When the gas venting pipe 400 is equipped with a control valve, control valves can be installed on both the hydrogen venting pipe 410 and the oxygen venting pipe 420.

[0095] Furthermore, please refer to the following: Figures 1 to 2 The hydrogen vent pipe 410 and the oxygen vent pipe 420 are respectively equipped with a first pressure gauge 810 and a second pressure gauge 820; the control valve group 600 includes a regulating valve 631, which is located on the hydrogen vent pipe 410; the hydrogen production system also includes a differential pressure gauge 830, which is electrically connected to both the first pressure gauge 810 and the second pressure gauge 820, and is also electrically connected to the regulating valve 631.

[0096] By installing a first pressure gauge 810 and a second pressure gauge 820 on the hydrogen vent pipe 410 and the oxygen vent pipe 420 respectively, the first pressure gauge 810 can monitor the gas pressure in the hydrogen vent pipe 410, and the second pressure gauge 820 can monitor the gas pressure in the oxygen vent pipe 420. It is understood that, ideally, the pressure ratio of hydrogen to oxygen is typically 2:1; therefore, the pressure difference between the first pressure gauge 810 and the second pressure gauge 820 must be kept within a certain preset range. By setting a differential pressure gauge 830, both the first pressure gauge 810 and the second pressure gauge 820 are electrically connected to the differential pressure gauge 830. The pressure of hydrogen measured by the first pressure gauge 810 and the pressure of oxygen measured by the second pressure gauge 820 can be fed back to the differential pressure gauge 830, which then calculates the pressure difference and compares it with the preset pressure difference range. By electrically connecting the differential pressure gauge 830 to the regulating valve 631, the opening of the regulating valve 631 can be adaptively adjusted based on the difference between the hydrogen-side pressure and the oxygen-side pressure calculated by the differential pressure gauge 830, thereby achieving the effect of regulating the hydrogen-side pressure. Specifically, when the differential pressure value calculated by the differential pressure gauge 830 is greater than the preset differential pressure range, the opening of the regulating valve 631 can be increased, thereby achieving the effect of appropriately relieving pressure on the hydrogen side. When the differential pressure value calculated by the differential pressure gauge 830 is less than the preset differential pressure range, the opening of the regulating valve 631 can be decreased, thereby achieving the effect of appropriately increasing pressure on the hydrogen side. Specifically, the regulating valve 631 can be the aforementioned third control valve 630, that is, the aforementioned third control valve 630 has both an open or closed state and a function of regulating the opening, which can reduce the number of valves in the control valve group 600. Alternatively, the third control valve 630 can be only a switch valve, and the regulating valve 631 can also be another control valve that can regulate the opening, different from the third control valve 630.

[0097] In some embodiments of this application, please refer to the references Figures 1 to 3 The storage tank 740 is connected to a level gauge 900.

[0098] By connecting a level gauge 900 to the storage tank 740, the liquid level in the tank can be monitored in real time, thereby further determining whether the electrolyte in the electrolytic cell 100 is being discharged into the storage tank 740. Specifically, when the reading of the level gauge 900 no longer changes within a certain time range, it can be determined that the electrolyte in the electrolytic cell 100 has been completely discharged.

[0099] This application also proposes a control method for a hydrogen production system, such as... Figure 4 As shown, the specific structure of the hydrogen production system in the control method of the hydrogen production system refers to the above embodiments. Since the control method of this hydrogen production system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0100] In this application, the control method for the hydrogen production system includes:

[0101] S10: Obtain the operating status of electrolytic cell 100;

[0102] S20: When at least one of the electrolytic cells 100 is found to be in a fault state, the electrolytic cell 100 in the fault state is controlled to be in an unstarted state, and the first pipe 310 and the second pipe 320 connected to the electrolytic cell 100 in the fault state are both controlled to be in a cut-off state.

[0103] S30: Control the gas discharge from the electrolytic cell 100;

[0104] S40: Control the liquid discharge pipe 500 to be in a flow state;

[0105] S50: Obtain the current discharge status of the electrolytic cell 100;

[0106] S60: When the current discharge state is stopped, the gas inlet / outlet 110 and the liquid discharge pipe 500 in the electrolytic cell 100 are both controlled to be in a non-flowing state.

[0107] The operating status of the electrolyzer 100 includes normal operating status and fault status. For example, an analyzer can be installed at the oxygen inlet / outlet of the gas inlet / outlet 110 of the electrolyzer 100 to analyze the hydrogen content in the oxygen. When the hydrogen content in the oxygen is high and exceeds a preset range, the electrolyzer 100 is considered to be in an abnormal operating state, i.e., a fault state. This fault may be caused by damage to the diaphragm within the electrolyzer 100. When the hydrogen content in the oxygen is within the preset range, the electrolyzer 100 is considered to be in normal operating status. Of course, other parameters, such as gas production rate, can also be used as the basis for determining whether the electrolyzer 100 is faulty.

[0108] When at least one electrolyzer 100 is found to be in a faulty state, it needs to be isolated and repaired. To isolate the electrolyzer 100, it needs to be disconnected from other parts of the hydrogen production system and placed in a non-starting state to facilitate repair. By controlling the first pipe 310 and the second pipe 320 connected to the electrolyzer 100 in the faulty state to be in a shut-off state, the normal gas production and transportation channels of the electrolyzer 100 and the return flow from the gas-liquid separator 200 to the electrolyzer 100 can be cut off.

[0109] Furthermore, for safety and ease of maintenance, it is necessary to discharge the liquid and gas within the electrolytic cell 100. By controlling the discharge of gas from the electrolytic cell 100, interference from gas during maintenance can be reduced, and the risk of explosion caused by the mixing of hydrogen and oxygen within the electrolytic cell 100, which could result in injury to maintenance personnel, can be decreased. Specifically, the discharge of gas from the electrolytic cell 100 can be achieved by venting the gas into the gas vent pipe 400, or by discharging the gas along with the electrolyte into the storage tank 740.

[0110] By controlling the liquid discharge pipe 500 to be in a flowing state, the electrolyte in the electrolytic cell 100 can be discharged through the liquid discharge pipe 500, thereby facilitating maintenance operations on the electrolytic cell 100. It should be noted that the process of controlling the gas discharge in the electrolytic cell 100 and the process of controlling the liquid discharge pipe 500 to be in a flowing state to discharge the electrolyte can be carried out simultaneously, or the gas can be discharged first and then the liquid can be discharged, etc.

[0111] Furthermore, by acquiring the current drainage status of the electrolyzer 100, it is possible to determine when the liquid discharge pipe 500 and the gas vent pipe 400 can be shut off. This further ensures that the electrolyzer 100 requiring maintenance is isolated from other parts of the hydrogen production system, facilitating maintenance personnel to begin maintenance operations on the electrolyzer 100. Specifically, the current drainage status includes both a drainage in progress state and a drainage stopped state. This can be monitored by detecting changes in the liquid level in the storage tank 740 or by installing a flow meter on the liquid discharge pipe 500. When the current drainage status is stopped, the gas inlet / outlet 110 and the liquid discharge pipe 500 of the electrolyzer 100 can be controlled to be in a non-flowing state, thereby isolating the electrolyzer 100 from other parts of the hydrogen production system and facilitating maintenance personnel to begin maintenance operations on the electrolyzer 100.

[0112] In this application, by obtaining the operating status of the electrolyzer 100, it is possible to determine whether the electrolyzer 100 needs maintenance, or which one or several electrolyzers 100 require maintenance. When at least one electrolyzer 100 is found to be in a faulty state, the faulty electrolyzer 100 is controlled to be in an inactive state, and the first pipe 310 and the second pipe 320 connected to the faulty electrolyzer 100 are both controlled to be in a closed state, thereby isolating the electrolyzer 100 from other parts of the hydrogen production system. By controlling the gas discharge from the electrolyzer 100 and controlling the liquid discharge pipe 500 to be in a flowing state, both gas and liquid in the electrolyzer 100 can be discharged, thereby improving the safety during the maintenance of the electrolyzer 100. In this application, because the gas vent pipe 400 and the liquid discharge pipe 500 are separately configured, it is possible to achieve the effect of disconnecting the electrolyzer 100 in a faulty state without shutting down other parts of the hydrogen production system, thus reducing the risk of system shutdown. Furthermore, by acquiring the current liquid discharge status of the electrolyzer 100, and controlling the gas inlet / outlet 110 and the liquid discharge pipe 500 to be in a non-flowing state when the current liquid discharge status is stopped, the timing for isolating the electrolyzer 100 from the liquid discharge pipe 500 and the gas vent pipe 400 can be determined. This ensures that the electrolyzer 100 can be more effectively disconnected without affecting the normal operation of other parts of the hydrogen production system.

[0113] Furthermore, in one example, please refer to the reference. Figure 1 , Figure 2 as well as Figure 4 The step of controlling the gas discharge from the electrolytic cell 100 specifically includes:

[0114] The gas vent pipe 400 is kept in a flow state.

[0115] By keeping the gas vent pipe 400 in a flowing state, the gas in the electrolytic cell 100 can be discharged to the outside through the gas vent pipe 400, thereby reducing the risk of safety accidents caused by residual gas in the electrolytic cell 100.

[0116] Furthermore, please refer to the following: Figure 1 , Figure 2 as well as Figure 4The gas inlet / outlet 110 in the hydrogen production system includes a hydrogen outlet and an oxygen outlet. The gas vent pipe 400 includes a hydrogen vent pipe 410 and an oxygen vent pipe 420, which are respectively connected to the hydrogen outlet and the oxygen outlet. A first pressure gauge 810 and a second pressure gauge 820 are respectively provided on the hydrogen vent pipe 410 and the oxygen vent pipe 420. The control valve group 600 includes a regulating valve 631, which is located on the hydrogen vent pipe 410. The hydrogen production system also includes a differential pressure gauge 830, which is electrically connected to both the first pressure gauge 810 and the second pressure gauge 820, and is also electrically connected to the regulating valve 631. After the step of controlling the gas vent pipe 400 to be in a flowing state, the system further includes:

[0117] Obtain the current value of the differential pressure gauge 830, compare the current value with a preset value range, and generate a comparison result;

[0118] Adjust the opening degree of the regulating valve 631 according to the comparison results.

[0119] Under ideal conditions, the pressure ratio of hydrogen to oxygen is typically 2:1. Therefore, the pressure difference between the first pressure gauge 810 and the second pressure gauge 820 must be within a certain preset range. By setting a differential pressure gauge 830, which is electrically connected to both the first and second pressure gauges 810 and 820, the pressure of hydrogen measured by the first pressure gauge 810 and the pressure of oxygen measured by the second pressure gauge 820 can both be fed back to the differential pressure gauge 830. By obtaining the current value of the differential pressure gauge 830, comparing it with a preset range, and generating a comparison result, adjusting the opening of the regulating valve 631 based on the comparison result, the differential pressure value of the differential pressure gauge 830 can be kept within the preset range. This reduces the risk of pressure imbalance on both sides of the hydrogen and oxygen sides damaging the isolation membrane inside the electrolyzer 100, thereby improving the accuracy of subsequent maintenance of the electrolyzer 100.

[0120] In another example, please refer to the reference. Figure 3 and Figure 4 The hydrogen production system further includes a nitrogen source, which is connected to the gas inlet / outlet 110 via a fourth pipe 340; the step of controlling the gas discharge from the electrolyzer 100 further includes:

[0121] The fourth pipe 340 is controlled to be in a flow state.

[0122] By keeping the fourth pipe 340 in a flowing state, the nitrogen source can fill the electrolytic cell 100 with nitrogen gas through the fourth pipe 340, thereby increasing the pressure inside the electrolytic cell 100 and providing power for the electrolyte to be discharged from the electrolytic cell 100.

[0123] In yet another example, the hydrogen production system further includes a nitrogen source connected to the gas inlet / outlet 110 via a fourth pipe 340, and the step of controlling the gas discharge from the electrolyzer 100 includes:

[0124] The gas vent pipe 400 is controlled to be in a closed state;

[0125] The fourth pipe 340 is controlled to be in a flow state.

[0126] By first shutting off the gas vent pipe 400 and then controlling the fourth pipe 340 to be open, the nitrogen source can be supplied with nitrogen gas through the fourth pipe 340 into the electrolytic cell 100, thereby increasing the pressure inside the electrolytic cell 100 and providing the power for the electrolyte to be discharged from the electrolytic cell 100. Furthermore, this setup also dilutes the hydrogen and oxygen concentrations inside the electrolytic cell 100, reducing the risk of an explosion due to the mixing of hydrogen and oxygen, and improving safety during subsequent maintenance.

[0127] Furthermore, please refer to the following: Figures 1 to 4 The step of obtaining the current discharge status of the electrolytic cell 100 specifically includes:

[0128] The liquid level height of the storage tank 740 is obtained in real time;

[0129] If the liquid level of the storage tank 740 remains constant within a preset time range, then the current discharge state of the electrolytic cell 100 is determined to be a stopped discharge state.

[0130] By acquiring the liquid level height of the storage tank 740, changes in the liquid level within the tank can be monitored, allowing for the determination of whether the electrolyte in the electrolytic cell 100 has been emptied. To acquire the liquid level height of the storage tank 740, a level gauge 900 can be installed on the tank 740, enabling real-time monitoring of the liquid level. When the liquid level height of the storage tank 740 remains constant within a preset time range, it indicates that no more electrolyte has flowed into the storage tank 740 from the electrolytic cell 100. This allows the electrolytic cell 100 to be determined to be in a stopped state, prompting the user to close the liquid discharge pipe 500 and perform maintenance on the electrolytic cell 100.

[0131] Furthermore, please refer to the following: Figures 1 to 4After the faulty electrolyzer 100 has been repaired and the fault has been resolved, it needs to be put back into production. To allow for replenishment of the electrolyzer 100, in some embodiments, the hydrogen production system further includes a nitrogen source, which is connected to the gas inlet / outlet 110 via a fourth pipe 340. Following the step of controlling both the gas inlet / outlet 110 and the liquid discharge pipe 500 in the electrolyzer 100 to be in a non-flowing state when the current discharge state is stopped, the system further includes:

[0132] The fourth pipe 340 is controlled to be in a flow state, and the sealing status of the electrolytic cell is obtained;

[0133] When the sealing condition of the electrolytic cell 100 is found to be in a qualified sealing state, the liquid discharge pipe 500 is controlled to be in a flow state, and the liquid in the storage tank 740 is controlled to flow into the electrolytic cell 100 through the liquid discharge pipe 500.

[0134] Obtain the liquid injection status of the electrolytic cell 100;

[0135] When the liquid filling status of the electrolytic cell 100 is obtained as full, the liquid discharge pipe 500 is controlled to be in a non-flowing state.

[0136] Keeping the fourth pipe 340 in a flowing state is to re-pressurize the electrolytic cell 100 with nitrogen supply. This pressurization with nitrogen supply can be higher than the pressure applied when the electrolyte in the electrolytic cell 100 flows to the liquid discharge pipe 500, thus facilitating the testing of the electrolytic cell 100's sealing performance. Two different sealing states may occur during testing: a qualified seal and a failed seal. If the seal is failed, the electrolytic cell 100 needs to be re-inspected. If the seal is qualified, the electrolytic cell 100 has passed inspection and can proceed with the replenishment operation.

[0137] When the electrolyzer 100 is found to be in a qualified sealing state, by controlling the liquid discharge pipe 500 to be in a flowing state and controlling the liquid in the storage tank 740 to flow back into the electrolyzer 100 through the liquid discharge pipe 500, the electrolyte in the storage tank 740 is returned to the electrolyzer 100, thereby realizing the liquid replenishment operation of the electrolyzer 100. Of course, when the hydrogen production system includes the aforementioned fourth pipe 340 and the ninth control valve 691 provided on the fourth pipe 340, when it is necessary to re-inject electrolyte into the electrolyzer 100, the ninth control valve 691 of the fourth pipe 340 can be closed, thereby preventing the nitrogen source from charging nitrogen into the electrolyzer 100. Specifically, the liquid discharge pipe 500 of the aforementioned hydrogen production system includes a first sub-pipe 510 and a second sub-pipe 520. The first sub-pipe 510 is connected to the liquid inlet / outlet 120, and the second sub-pipe 520 is connected to the storage tank 740. The inlet end of the power pump 730 is connected to a first connecting pipe 530 and a second connecting pipe 540. The first connecting pipe 530 is also connected to the first sub-pipe 510, and the second connecting pipe 540 is also connected to the second sub-pipe 520. The outlet end of the power pump 730 is connected to a third connecting pipe 550 and a fourth connecting pipe 540. The third connecting pipe 550 and the fourth connecting pipe 540 are respectively connected to the first sub-pipe 510 and the second sub-pipe 520. Furthermore, a fifth control valve 650, a sixth control valve 660, a seventh control valve 670, and an eighth control valve 680 may be respectively installed on the first connecting pipe 530, the second connecting pipe 540, the third connecting pipe 550, and the fourth connecting pipe 540. When the fifth control valve 650 and the eighth control valve 680 are closed, the sixth control valve 660 and the seventh control valve 670 are opened, thereby achieving the effect of returning the electrolyte from the storage tank 740 to the electrolytic cell 100. Alternatively, in other examples, the power pump 730 can be a bidirectional pump, that is, when the power pump 730 rotates forward, it can drive the electrolyte from the electrolytic cell 100 to the storage tank 740, and when it rotates in reverse, it can drive the electrolyte from the storage tank 740 to the electrolytic cell 100, thereby achieving the effect of driving the electrolyte in the storage tank 740 back to the electrolytic cell 100 simply by changing the rotation direction of the power pump 730.

[0138] By acquiring the liquid filling status of the electrolytic cell 100, it can be determined whether the electrolytic cell 100 is full of liquid. When the liquid filling status of the electrolytic cell 100 is acquired to be full, the risk of electrolyte flowing away again through the liquid discharge pipe 500 is reduced by controlling the liquid discharge pipe 500 to be in a non-flowing state. Specifically, in order to determine whether the electrolytic cell 100 is full of electrolyte, in one example, the liquid level in the electrolytic cell 100 can be detected in real time by setting a level gauge connected to the electrolytic cell 100. In another example, the gas vent pipe 400 can be controlled to be in a flowing state, which can vent the gas in the electrolytic cell 100. On the other hand, when the liquid discharge pipe 500 is in a flowing state and the liquid in the storage tank 740 flows back into the electrolytic cell 100, a sight glass 720 can be installed on the gas vent pipe 400. When the liquid is observed through the sight glass 720 on the gas vent pipe 400, it indicates that the electrolyte in the electrolytic cell 100 is full. After it is full, the gas vent pipe 400 and the liquid discharge pipe 500 can be controlled to be in a closed state.

[0139] Furthermore, after the step of controlling the liquid discharge pipe 500 to be in a non-flowing state when the electrolytic cell 100 is in a full state, the method further includes:

[0140] Determine whether the current hydrogen production system meets the preset power start-up conditions of the electrolyzer 100;

[0141] When the preset power start-up conditions of the electrolytic cell 100 are met, the first pipe 310 and the second pipe 320 are both controlled to be in a flow state.

[0142] Determine whether the liquid temperature in the second pipe 320 has reached the preset temperature range;

[0143] When the liquid temperature in the second pipe 320 reaches the preset temperature range, the electrolytic cell 100 is turned on.

[0144] By determining whether the current hydrogen production system meets the preset power start-up conditions of the electrolyzer 100, it can be determined whether the electrolyte in the electrolyzer 100 needs to be in a circulating state to increase its temperature during circulation. When the preset power start-up conditions of the electrolyzer 100 are met, both the first pipe 310 and the second pipe 320 are controlled to be in a flowing state, thereby enabling the electrolyte in the electrolyzer 100 to be in a circulating state to increase its temperature during circulation. Since the electrolyzer 100 needs to meet certain electrolyte temperature requirements for normal operation, it can be determined whether the electrolyzer 100 meets the start-up conditions by determining whether the liquid temperature in the second pipe 320 reaches the preset temperature range. Specifically, a thermometer can be installed on the second pipe 320 to monitor the liquid temperature in the second pipe 320 in real time. When the liquid temperature in the second pipe 320 reaches the preset temperature range, the electrolyzer 100 is controlled to start up, thereby restoring the electrolyzer 100 to normal operation.

[0145] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A hydrogen production system, characterized in that, include: An electrolytic cell, wherein at least two electrolytic cells are connected in parallel, and the electrolytic cell has a gas inlet / outlet and a liquid inlet / outlet; A gas-liquid separator having a mixture inlet and a liquid outlet, wherein the gas inlet and outlet are connected to the mixture inlet via a first pipe, and the liquid outlet is connected to the liquid inlet and outlet via a second pipe; A gas venting pipe is provided, and each of the electrolytic cells is connected to the gas inlet and outlet of the gas venting pipe. The end of the gas venting pipe away from the gas inlet and outlet is connected to the outside. The liquid discharge pipe is also connected to the liquid inlet and outlet of each electrolytic cell; The liquid storage tank, and the liquid discharge pipe is also connected to the liquid storage tank; and A control valve assembly is provided, wherein the control valve assembly is capable of controlling both the first and second pipes to be in a flowing state, and both the gas vent pipe and the liquid discharge pipe to be in a closed state; or, the control valve assembly is capable of controlling both the first and second pipes to be in a closed state, and both the gas vent pipe and the liquid discharge pipe to be in a flowing state.

2. The hydrogen production system as described in claim 1, characterized in that, The hydrogen production system also includes a gas buffer tank, which is located on the gas vent pipe.

3. The hydrogen production system as described in claim 2, characterized in that, The hydrogen production system also includes a nitrogen source, which is connected to the gas buffer tank via a third pipeline.

4. The hydrogen production system as described in claim 3, characterized in that, The nitrogen source is connected to the gas inlet and outlet via a fourth pipe, and the control valve group can also control the fourth pipe to be in a flowing state or a closed state.

5. The hydrogen production system as described in claim 1, characterized in that, The gas vent pipe is also equipped with a sight glass.

6. The hydrogen production system as described in claim 1, characterized in that, The hydrogen production system also includes a power pump, which is located on the liquid discharge pipe.

7. The hydrogen production system as described in claim 6, characterized in that, The liquid discharge pipe includes a first sub-pipe and a second sub-pipe. The first sub-pipe is connected to the liquid inlet and outlet, and the second sub-pipe is connected to the liquid storage tank. The inlet end of the power pump is connected to a first connecting pipe and a second connecting pipe. The first connecting pipe is also connected to the first sub-pipe, and the second connecting pipe is also connected to the second sub-pipe. The outlet end of the power pump is connected to a third connecting pipe and a fourth connecting pipe. The third connecting pipe and the fourth connecting pipe are respectively connected to the first sub-pipe and the second sub-pipe. The control valve assembly can also control the connection between the first connecting pipe and the fourth connecting pipe; or control the connection between the second connecting pipe and the third connecting pipe.

8. The hydrogen production system as described in claim 1, characterized in that, The gas inlet and outlet include a hydrogen outlet and an oxygen outlet, and the gas vent pipe includes a hydrogen vent pipe and an oxygen vent pipe, which are respectively connected to the hydrogen outlet and the oxygen outlet. The hydrogen vent pipe and the oxygen vent pipe are respectively equipped with a first pressure gauge and a second pressure gauge; the control valve group includes a regulating valve, which is located on the hydrogen vent pipe; the hydrogen production system also includes a differential pressure gauge, the first pressure gauge and the second pressure gauge are both electrically connected to the differential pressure gauge, and the differential pressure gauge is also electrically connected to the regulating valve.

9. The hydrogen production system according to any one of claims 1 to 8, characterized in that, The storage tank is connected to a level gauge.

10. A control method based on a hydrogen production system as described in any one of claims 1 to 9, characterized in that, The control method for the hydrogen production system includes: Obtain the operating status of the electrolytic cell; When at least one of the electrolytic cells is found to be in a fault state, the electrolytic cell in the fault state is controlled to be in an unstarted state, and the first pipe and the second pipe connected to the electrolytic cell in the fault state are both controlled to be in a shut-off state. Control the discharge of gas from the electrolytic cell; The liquid discharge pipe is kept in a flow state. Obtain the current discharge status of the electrolytic cell; When the current drainage status is stopped, the gas inlet / outlet and the liquid discharge pipe in the electrolytic cell are both kept in a non-flowing state.

11. The control method for the hydrogen production system as described in claim 10, characterized in that, The step of controlling the gas discharge from the electrolytic cell specifically includes: The gas vent pipe is kept in a flowing state.

12. The control method for the hydrogen production system as described in claim 11, characterized in that, The hydrogen production system includes the hydrogen production system as described in claim 9; after the step of controlling the gas vent pipe to be in a flowing state, it further includes: Obtain the current value of the differential pressure gauge, compare the current value with a preset value range, and generate a comparison result; Adjust the opening degree of the regulating valve according to the comparison results.

13. The control method for the hydrogen production system as described in claim 11, characterized in that, The hydrogen production system further includes a nitrogen source, which is connected to the gas inlet / outlet via a fourth pipe; the step of controlling the gas discharge from the electrolyzer further includes: The fourth pipe is controlled to be in a flow state.

14. The control method for the hydrogen production system as described in claim 10, characterized in that, The hydrogen production system also includes a nitrogen source, which is connected to the gas inlet / outlet via a fourth pipe. The step of controlling the gas discharge from the electrolyzer includes: The gas vent pipe is controlled to be in a closed state; The fourth pipe is controlled to be in a flow state.

15. The control method for the hydrogen production system as described in claim 10, characterized in that, The step of obtaining the current discharge status of the electrolytic cell specifically includes: The liquid level in the storage tank is acquired in real time. If the liquid level in the storage tank remains constant within a preset time range, then the current discharge state of the electrolytic cell is determined to be a stopped discharge state.

16. The control method for the hydrogen production system as described in claim 10, characterized in that, The hydrogen production system further includes a nitrogen source, which is connected to the gas inlet and outlet via a fourth pipe; after the step of controlling the gas inlet and outlet and the liquid discharge pipe in the electrolyzer to be in a non-flowing state when the current discharge state is stopped, the system further includes: The fourth pipe is controlled to be in a flow state, and the sealing status of the electrolytic cell is obtained; When the sealing condition of the electrolytic cell is found to be in a qualified sealing state, the liquid discharge pipe is controlled to be in a flow state, and the liquid in the storage tank is controlled to flow into the electrolytic cell through the liquid discharge pipe; Obtain the liquid injection status of the electrolytic cell; When the electrolyte cell is found to be full, the liquid discharge pipe is controlled to be in a non-flowing state.

17. The control method for the hydrogen production system as described in claim 16, characterized in that, The step of controlling the liquid discharge pipe to be in a non-flowing state when the electrolytic cell is in a full state further includes: Determine whether the current hydrogen production system meets the preset power start-up conditions of the electrolyzer; When the preset power start-up conditions of the electrolytic cell are met, both the first and second pipes are controlled to be in a flow state. Determine whether the liquid temperature in the second pipe has reached the preset temperature range; When the liquid temperature in the second pipe reaches the preset temperature range, the electrolytic cell is turned on.

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