Alkaline water electrolysis hydrogen production system

Abstract

The utility model discloses an alkaline water electrolysis hydrogen production system which comprises an oxygen separation device, an oxygen pressure control device, a hydrogen separation device, a hydrogen pressure control device and a controller. The oxygen pressure control device adopts a combined valve of a first pneumatic ball valve, a second pneumatic ball valve, a first stop valve and a first back pressure valve; the hydrogen pressure control device adopts a combination valve of a third pneumatic ball valve, a fourth pneumatic ball valve, a second stop valve and a second back pressure valve, the combination valve is 2-3 thousand yuan per set, and when the system works, only the second pneumatic ball valve and the fourth pneumatic ball valve need to be opened and closed, so that the quick-wear parts only comprise pneumatic ball valve actuators, and the safety of the system is greatly improved. Not only is cost greatly reduced, but also replacement and maintenance are more convenient and faster.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrogen production, and particularly relates to an alkaline water electrolysis hydrogen production system. Background Art

[0002] In the alkaline water electrolysis hydrogen production system, the amount of hydrogen produced is twice that of oxygen. The hydrogen and oxygen produced by water electrolysis are mixed with alkaline solution and enter the hydrogen separator and oxygen separator respectively. Due to the different amounts produced, it will cause pressure imbalance on both sides of hydrogen and oxygen. The pressure imbalance directly affects the liquid level difference of gas-liquid separation on both sides, affecting the gas-liquid separation effect. Excessive pressure difference will also cause hydrogen and oxygen leakage on both sides of the electrolyzer diaphragm. Therefore, how to control the pressure of the hydrogen production system to maintain at the working pressure and maintain the pressure balance on both sides of hydrogen and oxygen is crucial to the efficiency of water electrolysis hydrogen production, hydrogen safety, and hydrogen purity.

[0003] Currently, the hydrogen / oxygen that has undergone secondary separation is mainly controlled by frequently adjusting the opening of a pneumatic diaphragm control valve to maintain the operating pressure of the entire system. However, this system requires high manufacturing precision of the pneumatic diaphragm control valve. However, the manufacturing cost of high-precision pneumatic diaphragm control valves is very high, especially for small-flow pneumatic diaphragm control valves, which cost about 15,000 to 20,000 yuan per unit.

[0004] Therefore, how to maintain the pressure balance on both sides of hydrogen and oxygen while effectively reducing costs is a technical problem that those skilled in the art urgently need to solve. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide an alkaline water electrolysis hydrogen production system that can maintain pressure balance on both sides of hydrogen and oxygen and effectively reduce costs.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] An alkaline water electrolysis hydrogen production system includes an oxygen separation device, an oxygen pressure control device, a hydrogen separation device, a hydrogen pressure control device and a controller;

[0008] The oxygen separation device is used to separate the oxygen generated by electrolyzing water to produce hydrogen and the oxygen in the mixture formed by the alkaline solution;

[0009] The oxygen pressure control device includes an oxygen inlet pipeline, a first oxygen delivery pipeline, a second oxygen delivery pipeline, and an oxygen outlet pipeline. The oxygen inlet pipeline is provided with a first pressure detection component, the first oxygen delivery pipeline is provided with a first pneumatic ball valve and a first stop valve, the second oxygen delivery pipeline is provided with a second pneumatic ball valve and a first back pressure valve, the first pneumatic ball valve, the first stop valve, and the first back pressure valve are all normally open valves, and the second pneumatic ball valve is electrically connected to the controller;

[0010] The hydrogen separation device is used to separate the hydrogen produced by electrolysis of water and the hydrogen in the mixture formed by the alkaline solution;

[0011] The hydrogen pressure control device includes a hydrogen inlet pipeline, a first hydrogen delivery pipeline, a second hydrogen delivery pipeline and a hydrogen outlet pipeline. The hydrogen inlet pipeline is provided with a second pressure detection component, the first hydrogen delivery pipeline is provided with a third pneumatic ball valve and a second stop valve, and the second hydrogen delivery pipeline is provided with a fourth pneumatic ball valve and a second back pressure valve. The third pneumatic ball valve, the second stop valve and the second back pressure valve are all normally open valves, and the second pressure detection component and the fourth pneumatic ball valve are both electrically connected to the controller.

[0012] Optionally, both the first pressure detecting component and the second pressure detecting component are pressure transmitters or pressure sensors.

[0013] Optionally, the oxygen pressure control device further includes a third oxygen delivery pipeline, and the third oxygen delivery pipeline is further provided with a first ball valve and a first pressure gauge;

[0014] The hydrogen pressure control device further includes a third hydrogen delivery pipeline, and the third hydrogen delivery pipeline is further provided with a second ball valve and a second pressure gauge.

[0015] Optionally, both the first ball valve and the second ball valve are manual valves or pneumatic valves.

[0016] Optionally, the hydrogen outlet pipeline includes a first hydrogen outlet pipeline and a second hydrogen outlet pipeline, the first hydrogen outlet pipeline is connected to the outside atmosphere, and the second hydrogen outlet pipeline is connected to the purification system.

[0017] Optionally, the hydrogen separation device includes a hydrogen separator, a hydrogen level meter and a hydrogen heat exchanger, wherein the hydrogen separator is capable of receiving a mixture of hydrogen and alkaline solution from the electrolyzer and separating the hydrogen from the mixture;

[0018] The hydrogen level meter is used to detect the liquid level in the hydrogen separator, and the hydrogen level meter is electrically connected to the controller;

[0019] The hydrogen heat exchanger is used to exchange heat with the hydrogen separated from the hydrogen separator.

[0020] Optionally, the hydrogen separation device further includes a secondary hydrogen gas-liquid separator, and both ends of the secondary hydrogen gas-liquid separator are respectively connected to the hydrogen heat exchanger and the hydrogen pressure control device.

[0021] Optionally, the oxygen separation device includes an oxygen separator, an oxygen level meter, and an oxygen heat exchanger, wherein the oxygen separator is capable of receiving a mixture of oxygen from the electrolyzer and an alkaline solution and separating the oxygen from the mixture;

[0022] The oxygen level meter is used to detect the liquid level in the oxygen separator, and the oxygen level meter is electrically connected to the controller;

[0023] The oxygen heat exchanger is used to exchange heat with the oxygen separated from the oxygen separator.

[0024] Optionally, the oxygen separation device further includes a secondary oxygen gas-liquid separator, and both ends of the secondary oxygen gas-liquid separator are respectively connected to the heat exchanger and the oxygen pressure control device.

[0025] It can be seen from the above technical solution that when the alkaline water electrolysis hydrogen production system is working, after the oxygen generated by water electrolysis hydrogen production enters the oxygen inlet pipeline in the oxygen pressure control device, the first pressure detection component detects the oxygen pressure value entering the oxygen pressure control device. When the first pressure detection component detects that the oxygen pressure value in the oxygen pressure control device is greater than the preset pressure value, the controller controls the second pneumatic ball valve to open. At this time, the oxygen flows through the first pneumatic ball valve, the first stop valve, the second pneumatic ball valve and the first back pressure valve, and flows out from the oxygen outlet pipeline, so that the oxygen pressure value in the oxygen pressure control device is maintained at the preset pressure value; when the first pressure detection component detects that the oxygen pressure value is less than the preset pressure value, the controller controls the second pneumatic ball valve to close. At this time, the oxygen only flows through the first pneumatic ball valve and the first stop valve, and flows out from the oxygen outlet pipeline, so that the oxygen pressure value in the oxygen pressure control device is maintained at the preset pressure value.

[0026] Since there is a liquid level difference between the hydrogen separation device and the oxygen separation device, when the liquid level of the hydrogen separation device is lower than the liquid level of the oxygen separation device, it means that the pressure of the hydrogen pressure control device is higher than the pressure of the oxygen pressure control device. At this time, the controller controls the second pneumatic ball valve to open, so that hydrogen flows through the third pneumatic ball valve, the second stop valve, the fourth pneumatic ball valve and the second back pressure valve, so that the hydrogen pressure value in the hydrogen pressure control device remains the same as the pressure value of the oxygen pressure control device; when the liquid level of the hydrogen separation device is higher than the liquid level of the oxygen separation device, it means that the pressure of the hydrogen pressure control device is lower than the pressure of the oxygen pressure control device. At this time, the controller controls the second pneumatic ball valve to open, so that the hydrogen pressure value in the hydrogen pressure control device remains the same as the pressure value of the oxygen pressure control device.

[0027] Compared with the prior art, in the alkaline water electrolysis hydrogen production system disclosed in the embodiment of the present utility model, the oxygen pressure control device adopts a combination valve of a first pneumatic ball valve, a second pneumatic ball valve, a first stop valve and a first back pressure valve; the hydrogen pressure control device adopts a combination valve of a third pneumatic ball valve, a fourth pneumatic ball valve, a second stop valve and a second back pressure valve. The combination valve costs 2,000 to 3,000 yuan per set, and when the system is working, only the second pneumatic ball valve and the fourth pneumatic ball valve need to be opened and closed. Therefore, the wearing parts only include the pneumatic ball valve actuator, which not only greatly reduces the cost but also makes replacement and maintenance more convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of the combined structure of an oxygen pressure control device and an oxygen separation device is provided for an embodiment of the present utility model;

[0030] Figure 2 A schematic diagram of the combined structure of a hydrogen pressure control device and a hydrogen separation device is provided for an embodiment of the present utility model.

[0031] Description of reference numerals:

[0032] 100. Oxygen separation device; 101. Oxygen separator; 102. Oxygen level gauge; 103. Oxygen heat exchanger; 104. Oxygen secondary gas-liquid separator;

[0033] 200, oxygen pressure control device; 201, oxygen inlet pipeline; 202, first oxygen delivery pipeline; 203, second oxygen delivery pipeline; 204, oxygen outlet pipeline; 205, third oxygen delivery pipeline; 206, first pressure detection element; 207, first pneumatic ball valve; 208, first stop valve; 209, second pneumatic ball valve; 210, first back pressure valve; 211, first ball valve; 212, first pressure gauge;

[0034] 300. Hydrogen separation device; 301. Hydrogen separator; 302. Hydrogen level gauge; 303. Hydrogen heat exchanger; 304. Hydrogen secondary gas-liquid separator;

[0035] 400. Hydrogen pressure control device; 401. Hydrogen inlet pipeline; 402. First hydrogen delivery pipeline; 403. Second hydrogen delivery pipeline; 404. Third hydrogen delivery pipeline; 405. First hydrogen outlet pipeline; 406. Second hydrogen outlet pipeline; 407. Second pressure detection component; 408. Third pneumatic ball valve; 409. Second stop valve; 410. Fourth pneumatic ball valve; 411. Second back pressure valve; 412. Second ball valve; 413. Second pressure gauge. DETAILED DESCRIPTION

[0036] In view of this, the core of the present invention is to provide an alkaline water electrolysis hydrogen production system, which can not only maintain the pressure balance on both sides of hydrogen and oxygen, but also effectively reduce costs.

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] Please refer to Figure 1 and Figure 2 The alkaline water electrolysis hydrogen production system disclosed in the embodiment of the present utility model includes an oxygen separation device 100, an oxygen pressure control device 200, a hydrogen separation device 300, a hydrogen pressure control device 400 and a controller.

[0039] Among them, the oxygen separation device 100 is used to separate the oxygen generated by hydrogen production from water electrolysis and the oxygen in the mixture formed by the alkaline solution. The oxygen pressure control device 200 includes an oxygen inlet pipeline 201, a first oxygen delivery pipeline 202, a second oxygen delivery pipeline 203 and an oxygen outlet pipeline 204. The oxygen inlet pipeline 201 is provided with a first pressure detection component 206, the first oxygen delivery pipeline 202 is provided with a first pneumatic ball valve 207 and a first stop valve 208, and the second oxygen delivery pipeline 203 is provided with a second pneumatic ball valve 209 and a first back pressure valve 210. The first pneumatic ball valve 207, the first stop valve 208 and the first back pressure valve 210 are all normally open valves, and the second pneumatic ball valve 209 is electrically connected to the controller.

[0040] The hydrogen separation device 300 is used to separate the hydrogen produced by water electrolysis and the hydrogen in the mixture formed by the alkaline solution. The hydrogen pressure control device 400 includes a hydrogen inlet pipeline 401, a first hydrogen delivery pipeline 402, a second hydrogen delivery pipeline 403 and a hydrogen outlet pipeline. The hydrogen inlet pipeline 401 is provided with a second pressure detection component 407, the first hydrogen delivery pipeline 402 is provided with a third pneumatic ball valve 408 and a second stop valve 409, and the second hydrogen delivery pipeline 403 is provided with a fourth pneumatic ball valve 410 and a second back pressure valve 411. The third pneumatic ball valve 408, the second stop valve 409 and the second back pressure valve 411 are all normally open valves, and the second pressure detection component 407 and the fourth pneumatic ball valve 410 are both electrically connected to the controller.

[0041] When the alkaline water electrolysis hydrogen production system is in operation, after the oxygen generated by water electrolysis hydrogen production enters the oxygen inlet pipe 201 in the oxygen pressure control device 200, the first pressure detection element 206 detects the oxygen pressure value entering the oxygen pressure control device 200. When the first pressure detection element 206 detects that the oxygen pressure value in the oxygen pressure control device 200 is greater than the preset pressure value, the controller controls the second pneumatic ball valve 209 to open. At this time, the oxygen flows through the first pneumatic ball valve 207, the first stop valve 208, the second pneumatic ball valve 209, and the first back pressure valve 210, and flows out of the oxygen outlet pipe 204, so that the oxygen pressure value in the oxygen pressure control device 200 is maintained at the preset pressure value. When the first pressure detection element 206 detects that the oxygen pressure value is less than the preset pressure value, the controller controls the second pneumatic ball valve 209 to close. At this time, the oxygen only flows through the first pneumatic ball valve 207 and the first stop valve 208, and flows out of the oxygen outlet pipe 204, so that the oxygen pressure value in the oxygen pressure control device 200 is maintained at the preset pressure value.

[0042] Due to the liquid level difference between the hydrogen separation device 300 and the oxygen separation device 100, when the liquid level of the hydrogen separation device 300 is lower than the liquid level of the oxygen separation device 100, it means that the pressure of the hydrogen pressure control device 400 is higher than the pressure of the oxygen pressure control device 200. At this time, the controller controls the second pneumatic ball valve 209 to open, allowing hydrogen to flow through the third pneumatic ball valve 408, the second stop valve 409, the fourth pneumatic ball valve 410, and the second back pressure valve 411, so that the hydrogen pressure value in the hydrogen pressure control device 400 remains the same as the pressure value in the oxygen pressure control device 200. When the liquid level of the hydrogen separation device 300 is higher than the liquid level of the oxygen separation device 100, it means that the pressure of the hydrogen pressure control device 400 is lower than the pressure of the oxygen pressure control device 200. At this time, the controller controls the second pneumatic ball valve 209 to open, so that the hydrogen pressure value in the hydrogen pressure control device 400 remains the same as the pressure value in the oxygen pressure control device 200.

[0043] Compared with the prior art, in the alkaline water electrolysis hydrogen production system disclosed in the embodiment of the present utility model, the oxygen pressure control device 200 adopts a combination valve of a first pneumatic ball valve 207, a second pneumatic ball valve 209, a first stop valve 208 and a first back pressure valve 210; the hydrogen pressure control device 400 adopts a combination valve of a third pneumatic ball valve 408, a fourth pneumatic ball valve 410, a second stop valve 409 and a second back pressure valve 411. The combination valve costs 2,000 to 3,000 yuan per set, and when the system is working, only the second pneumatic ball valve 209 and the fourth pneumatic ball valve 410 need to be opened and closed. Therefore, the wearing parts only include the pneumatic ball valve actuators, which not only greatly reduces the cost but also makes replacement and maintenance more convenient and quick.

[0044] The embodiment of the present utility model does not limit the specific structure of the first pressure detection component 206 and the second pressure detection component 407. As long as the structure meets the use requirements of the present utility model, it is within the protection scope of the present utility model.

[0045] As one embodiment, the first pressure detecting component 206 disclosed in the embodiment of the present utility model can be a pressure transmitter or a pressure sensor, and the second pressure detecting component 407206 can be a pressure transmitter or a pressure sensor.

[0046] As a further embodiment, the oxygen pressure control device 200 disclosed in the embodiment of the present invention further includes a third oxygen delivery pipeline 205. The third oxygen delivery pipeline 205 is further provided with a first ball valve 211 and a first pressure gauge 212. When the system pressure is abnormal, the first ball valve 211 can be opened to reduce the system pressure to 0 for maintenance. The pressure in the system can be observed through the first pressure gauge 212.

[0047] As a further embodiment, the hydrogen pressure control device 400 disclosed in the embodiment of the present utility model also includes a third hydrogen delivery pipeline 404, and a second ball valve 412 and a second pressure gauge 413 are also provided on the third hydrogen delivery pipeline 404. When the system pressure is abnormal, the second ball valve 412 can be opened to reduce the system pressure to 0 for maintenance, and the pressure in the system can be observed through the second pressure gauge 413.

[0048] The embodiment of the present utility model does not limit the specific structure of the first ball valve 211 and the second ball valve 412. As long as the structure meets the use requirements of the present utility model, it is within the protection scope of the present utility model.

[0049] As one embodiment, the first ball valve 211 disclosed in the embodiment of the present utility model can be a manual valve or a pneumatic valve, and the second ball valve 412 can be a manual valve or a pneumatic valve. Those skilled in the art can make a choice according to actual conditions.

[0050] When the first ball valve 211 is a pneumatic valve, the first ball valve 211 is electrically connected to the controller; when the second ball valve 412 is a pneumatic valve, the second ball valve 412 is electrically connected to the controller.

[0051] As a further example, the hydrogen outlet pipeline disclosed in the embodiment of the present invention includes a first hydrogen outlet pipeline 405 and a second hydrogen outlet pipeline 406. The first hydrogen outlet pipeline 405 is connected to the outside atmosphere, and the second hydrogen outlet pipeline 406 is connected to the purification system. When the hydrogen purity meets the requirements, it can enter the purification system; when the hydrogen purity does not meet the requirements, it can be discharged into the outside atmosphere.

[0052] The embodiment of the present utility model does not limit the specific structure of the hydrogen separation device 300. As long as the structure meets the use requirements of the present utility model, it is within the protection scope of the present utility model.

[0053] As one embodiment, the hydrogen separation device 300 disclosed in the embodiment of the present utility model includes a hydrogen separator 301, a hydrogen level meter 302 and a hydrogen heat exchanger 303, wherein the hydrogen separator 301 can receive a mixture of hydrogen and alkaline solution from the electrolyzer and separate the hydrogen in the mixture.

[0054] The hydrogen level gauge 302 is used to detect the liquid level height in the hydrogen separator 301. The hydrogen level gauge 302 is electrically connected to the controller. The hydrogen level gauge 302 transmits the liquid level information in the hydrogen separator 301 to the controller. The controller determines whether the pressures of the hydrogen pressure control device 400 and the oxygen pressure control device 200 are balanced based on the liquid level height, and adjusts the pressure of the hydrogen pressure control device 400.

[0055] The hydrogen heat exchanger 303 is used to exchange heat with the hydrogen separated from the hydrogen separator 301 .

[0056] A mixture of hydrogen and alkaline solution from the electrolyzer enters the hydrogen separator 301. The hydrogen separated by the hydrogen separator 301 enters the hydrogen heat exchanger 303. The hydrogen level meter 302 determines whether the pressures of the hydrogen pressure control device 400 and the oxygen pressure control device 200 are balanced by detecting the liquid level of the hydrogen separator 301, and adjusts the pressure of the hydrogen pressure control device 400.

[0057] As a further embodiment, the hydrogen separation device 300 disclosed in the embodiment of the present invention further includes a secondary hydrogen gas-liquid separator 304 , and both ends of the secondary hydrogen gas-liquid separator 304 are respectively connected to the hydrogen heat exchanger 303 and the hydrogen pressure control device 400 .

[0058] The embodiment of the present invention does not limit the specific structure of the oxygen separation device 100. As long as the structure meets the use requirements of the present invention, it falls within the protection scope of the present invention.

[0059] As one embodiment, the oxygen separation device 100 disclosed in the embodiment of the present invention includes an oxygen separator 101, an oxygen level meter 102 and an oxygen heat exchanger 103. The oxygen separator 101 can receive a mixture of oxygen and alkaline solution from the electrolytic cell and separate the oxygen in the mixture.

[0060] The oxygen level gauge 102 is used to detect the liquid level height in the oxygen separator 101. The oxygen level gauge 102 is electrically connected to the controller. The controller determines the pressure in the oxygen pressure control device 200 according to the liquid level height and adjusts the pressure in the oxygen pressure control device 200.

[0061] The oxygen heat exchanger 103 is used to exchange heat with the oxygen separated from the oxygen separator 101 .

[0062] A mixture of oxygen from the electrolyzer and the alkaline solution enters the oxygen separator 101. The hydrogen separated by the oxygen separator 1014 enters the oxygen heat exchanger 103. The oxygen level meter 102 determines the pressure inside the oxygen pressure control device 200 by detecting the liquid level height of the oxygen separator 101 and adjusts the pressure inside the oxygen pressure control device 200.

[0063] As a further embodiment, the oxygen separation device 100 disclosed in the embodiment of the present invention further includes a secondary oxygen gas-liquid separator 104 , and both ends of the secondary oxygen gas-liquid separator 104 are respectively connected to the oxygen heat exchanger 103 and the oxygen pressure control device 200 .

[0064] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0065] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0066] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An alkaline water electrolysis hydrogen production system, characterized in that: It includes an oxygen separation device, an oxygen pressure control device, a hydrogen separation device, a hydrogen pressure control device and a controller; The oxygen separation device is used to separate the oxygen generated by electrolyzing water to produce hydrogen and the oxygen in the mixture formed by the alkaline solution; The oxygen pressure control device includes an oxygen inlet pipeline, a first oxygen delivery pipeline, a second oxygen delivery pipeline, and an oxygen outlet pipeline. The oxygen inlet pipeline is provided with a first pressure detection component, the first oxygen delivery pipeline is provided with a first pneumatic ball valve and a first stop valve, the second oxygen delivery pipeline is provided with a second pneumatic ball valve and a first back pressure valve, the first pneumatic ball valve, the first stop valve, and the first back pressure valve are all normally open valves, and the second pneumatic ball valve is electrically connected to the controller; The hydrogen separation device is used to separate the hydrogen produced by electrolysis of water and the hydrogen in the mixture formed by the alkaline solution; The hydrogen pressure control device includes a hydrogen inlet pipeline, a first hydrogen delivery pipeline, a second hydrogen delivery pipeline and a hydrogen outlet pipeline. The hydrogen inlet pipeline is provided with a second pressure detection component, the first hydrogen delivery pipeline is provided with a third pneumatic ball valve and a second stop valve, and the second hydrogen delivery pipeline is provided with a fourth pneumatic ball valve and a second back pressure valve. The third pneumatic ball valve, the second stop valve and the second back pressure valve are all normally open valves, and the second pressure detection component and the fourth pneumatic ball valve are both electrically connected to the controller.

2. The alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: The first pressure detecting component and the second pressure detecting component are both pressure transmitters or pressure sensors.

3. The alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: The oxygen pressure control device further comprises a third oxygen delivery pipeline, and the third oxygen delivery pipeline is further provided with a first ball valve and a first pressure gauge; The hydrogen pressure control device further includes a third hydrogen delivery pipeline, and the third hydrogen delivery pipeline is further provided with a second ball valve and a second pressure gauge.

4. The alkaline water electrolysis hydrogen production system according to claim 3, characterized in that: The first ball valve and the second ball valve are both manual valves or pneumatic valves.

5. The alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: The hydrogen outlet pipeline includes a first hydrogen outlet pipeline and a second hydrogen outlet pipeline, the first hydrogen outlet pipeline is connected to the external atmosphere, and the second hydrogen outlet pipeline is connected to the purification system.

6. The alkaline water electrolysis hydrogen production system according to claim 5, characterized in that: The hydrogen separation device includes a hydrogen separator, a hydrogen level meter and a hydrogen heat exchanger. The hydrogen separator is capable of receiving a mixture of hydrogen and alkaline solution from the electrolyzer and separating the hydrogen from the mixture. The hydrogen level meter is used to detect the liquid level in the hydrogen separator, and the hydrogen level meter is electrically connected to the controller; The hydrogen heat exchanger is used to exchange heat with the hydrogen separated from the hydrogen separator.

7. The alkaline water electrolysis hydrogen production system according to claim 6, characterized in that: The hydrogen separation device further includes a secondary hydrogen gas-liquid separator, and both ends of the secondary hydrogen gas-liquid separator are respectively connected to the hydrogen heat exchanger and the hydrogen pressure control device.

8. The alkaline water electrolysis hydrogen production system according to claim 5, characterized in that: The oxygen separation device includes an oxygen separator, an oxygen level meter and an oxygen heat exchanger. The oxygen separator is capable of receiving a mixture of oxygen and alkaline solution from the electrolytic cell and separating the oxygen from the mixture. The oxygen level meter is used to detect the liquid level in the oxygen separator, and the oxygen level meter is electrically connected to the controller; The oxygen heat exchanger is used to exchange heat with the oxygen separated from the oxygen separator.

9. The alkaline water electrolysis hydrogen production system according to claim 8, characterized in that: The oxygen separation device further includes a secondary oxygen gas-liquid separator, and both ends of the secondary oxygen gas-liquid separator are respectively connected to the heat exchanger and the oxygen pressure control device.

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