Hydrogen production system

Abstract

The hydrogen production system comprises an electrolytic cell, an oxygen separation device, a hydrogen separation device, a circulating pump and a gas collection separation device, an oxygen outlet of the electrolytic cell is communicated with an inlet of the oxygen separation device, an outlet of the oxygen separation device is communicated with a first electrolyte conveying pipeline, and a hydrogen outlet of the electrolytic cell is communicated with an inlet of the hydrogen separation device; an outlet of the hydrogen separation device is communicated with a second electrolyte conveying pipeline, the first electrolyte conveying pipeline and the second electrolyte conveying pipeline are converged to form an electrolyte conveying pipeline, the electrolyte conveying pipeline is communicated with an electrolyte inlet of the electrolytic bath, and the circulating pump is arranged on the electrolyte conveying pipeline; and at least one of the first electrolyte conveying pipeline and the second electrolyte conveying pipeline is communicated. According to the hydrogen production system disclosed by the invention, due to the arrangement of the gas collection and separation device, hydrogen and oxygen in the electrolyte can be collected, the situation that hydrogen and oxygen flow back to the hydrogen separation device and the oxygen separation device is reduced, and the possibility that hydrogen and oxygen are mixed is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production by electrolysis, and more specifically, to a hydrogen production system. Background Art

[0002] Electrolysis is a traditional method of producing hydrogen. The main device is an electrolytic cell, which consists of a pair of electrodes immersed in an electrolyte and a diaphragm in the middle to prevent gas penetration. When a certain voltage of direct current is applied, water decomposes to produce hydrogen on the cathode surface and oxygen on the anode surface. In order to meet the requirements of low energy consumption, high purity, and high yield for industrial applications, the pressure difference on the hydrogen and oxygen sides of the electrolytic hydrogen production system must be reasonably designed. If the pressure difference is too large, the diaphragm will be broken, causing hydrogen and oxygen to mix, which is explosive.

[0003] Hydrogen production by electrolysis refers to the electrochemical process in which water molecules are dissociated into hydrogen and oxygen under the action of direct current, and then separated from the cathode and anode respectively. Depending on the electrolyte, it can be divided into two categories: alkaline water electrolysis hydrogen production and acidic water electrolysis hydrogen production. Figure 1 As shown in the figure, under the action of direct current, water molecules undergo a reduction reaction at the cathode to generate hydrogen and hydroxide ions (OH–). Hydroxyl ions (OH–) pass through the diaphragm to the anode under the action of the electric field and the concentration difference between the hydrogen and oxygen sides, and undergo an oxygen evolution reaction on the anode side to generate oxygen and water. When the electrolyzer is assembled, it is immersed in a high concentration (20%~30%) KOH solution. At this time, the ion conductivity is the highest. The main disadvantage is that the electrolyte is corrosive. NaOH and NaCl solutions can also be used as electrolytes, but they are not commonly used. The electrolytic cell of the alkali tank is divided into two electrodes, which separate the airtight diaphragm. Due to the obstruction of the diaphragm, hydrogen and oxygen will not mix together through the diaphragm, but the electrolyte can enter the other side through the diaphragm. When the hydrogen production system is in operation, the mixture of hydrogen and alkali solution and the mixture of oxygen and alkali solution pass through the gas-water separator to separate the gas and solution, and the alkali solution flows back to the electrolyzer. The hydrogen and oxygen enter the purification device for purification and collection.

[0004] In the existing hydrogen production system, due to structural limitations, the hydrogen and oxygen free in the pipeline cannot be completely separated. A part of them randomly enters the gas-liquid separation device on both sides through the pipeline. As a result, the alkaline liquid at the outlet of the anode and cathode gas-liquid separator is mixed with more than 90% hydrogen and oxygen due to the electrolyte mixing mode, which is very dangerous.

[0005] The existing technology uses electronic equipment to detect the concentration changes of oxygen in hydrogen and hydrogen in oxygen. It is difficult to achieve real-time control and monitoring. There are errors in the monitoring equipment at different monitoring points, and there is a lag time in the electronic equipment. In addition, the electronic equipment and control system are relatively expensive and complex, requiring professional designers and construction personnel to design and construct. The requirements for operators are too high, and professional training is required for operators. In addition, electronic control equipment cannot be used in certain occasions (such as places with a relatively high explosion-proof level). Even if it is found that the mixing concentration exceeds the standard, the system can only be shut down to discharge all the gas in the separator.

[0006] Therefore, how to reduce the occurrence of hydrogen-oxygen mixing in the hydrogen production system and ensure the safe operation of the hydrogen production system has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0007] In view of this, an object of the present invention is to provide a hydrogen production system to reduce the occurrence of hydrogen-oxygen mixing in the hydrogen production system and ensure the safe operation of the hydrogen production system.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A hydrogen production system, comprising:

[0010] Electrolyzer;

[0011] An oxygen separation device, wherein the oxygen outlet of the electrolyzer is connected to the inlet of the oxygen separation device, and the outlet of the oxygen separation device is connected to the first electrolyte delivery pipeline;

[0012] A hydrogen separation device, wherein the hydrogen outlet of the electrolyzer is connected to the inlet of the hydrogen separation device, and the outlet of the hydrogen separation device is connected to the second electrolyte delivery pipeline;

[0013] A circulation pump, wherein the first electrolyte delivery pipeline and the second electrolyte delivery pipeline merge into an electrolyte delivery pipeline, the electrolyte delivery pipeline is connected to the electrolyte inlet of the electrolytic cell, and the circulation pump is arranged on the electrolyte delivery pipeline;

[0014] The gas collecting and separating device includes at least one gas collecting and separating device, and is connected to at least one of the first electrolyte delivery pipeline and the second electrolyte delivery pipeline. An exhaust port is arranged on the top of the gas collecting and separating device.

[0015] Optionally, in the above-mentioned hydrogen production system, an electrolyte inlet and an electrolyte outlet are provided on the gas collecting and separation device, the electrolyte inlet is provided on the side wall of the gas collecting and separation device, and the electrolyte outlet is provided at the bottom of the gas collecting and separation device. The electrolyte flowing out of the oxygen separation device and / or the hydrogen separation device flows into the gas collecting and separation device through the electrolyte inlet and flows out from the electrolyte outlet.

[0016] Optionally, in the above hydrogen production system, the gas collecting and separating devices include two, one of which is arranged on the first electrolyte delivery pipeline, and the other is arranged on the second electrolyte delivery pipeline.

[0017] Optionally, in the above hydrogen production system, the gas collection and separation device includes one, and is arranged on one of the first electrolyte delivery pipeline and the second electrolyte delivery pipeline.

[0018] Optionally, in the above-mentioned hydrogen production system, the gas collection and separation device includes one, a connecting pipeline is arranged between the first electrolyte delivery pipeline and the second electrolyte delivery pipeline, the height of the connecting pipeline is higher than the height of the first electrolyte delivery pipeline and the second electrolyte delivery pipeline, and the gas collection and separation device is arranged on the connecting pipeline.

[0019] Optionally, in the above hydrogen production system, a separation component is provided in the gas collecting and separating device, an air inlet hole is provided on the side wall of the separation component, and a gas channel connected to the exhaust port is opened in the separation component.

[0020] Optionally, in the above hydrogen production system, a filter screen or a diaphragm is provided in the gas collection and separation device, and the bottom height of the filter screen or the diaphragm is higher than the height of the electrolyte inlet.

[0021] Optionally, in the above hydrogen production system, an observation window is provided on the gas collecting and separating device.

[0022] Optionally, in the above hydrogen production system, an exhaust valve is provided on the exhaust port of the gas collecting and separating device.

[0023] Optionally, in the above hydrogen production system, the electrolyzers include multiple electrolyzers, the oxygen outlet of each electrolyzer is connected to the inlet of the oxygen separation device through an oxygen pipeline, and the hydrogen outlet of each electrolyzer is connected to the inlet of the hydrogen separation device through a hydrogen pipeline.

[0024] It can be seen from the above scheme that the hydrogen production system disclosed in the present invention includes a gas collection and separation device, which includes at least one gas collection and separation device, which is connected to at least one of the first electrolyte delivery pipeline and the second electrolyte delivery pipeline. In the first electrolyte delivery pipeline and the second electrolyte delivery pipeline, the hydrogen and oxygen in the electrolyte flow with the electrolyte. When the electrolyte flows through the gas collection and separation device, since the density of the gas is less than the density of the electrolyte and it does not circulate with the electrolyte, the hydrogen and oxygen in the electrolyte are freed from the electrolyte, float up and gather at the top of the gas collection and separation device. The gas collection and separation device collects the precipitated and free hydrogen and oxygen from the electrolyte, so that they will not flow back into the hydrogen separation device and the oxygen separation device, and can be discharged through the exhaust port on the top. Corresponding treatment is performed on them, which effectively blocks the path of gas mixing and reduces the possibility of hydrogen and oxygen mixing. The hydrogen and oxygen mixing concentration in the hydrogen separation device and the oxygen separation device is always at a minimum, reducing the risk of explosion in the hydrogen production system and improving the safety of the hydrogen production system. At the same time, it can protect the circulation pump, reduce the probability of vacuum, and ensure the safe operation of the hydrogen production system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 Schematic diagram of electrolysis of alkaline aqueous solution;

[0027] Figure 2 It is a structural schematic diagram of a hydrogen production system disclosed in a first embodiment of the present invention;

[0028] Figure 3 It is a structural schematic diagram of a hydrogen production system disclosed in a second embodiment of the present invention;

[0029] Figure 4 It is a front view of the gas collection and separation device disclosed in an embodiment of the present invention;

[0030] Figure 5 It is a cross-sectional view of the gas collection and separation device disclosed in an embodiment of the present invention.

[0031] Wherein, 10 is an electrolytic cell, and 11 is an electrolyte delivery pipeline;

[0032] 20 is an oxygen separation device, 21 is a first electrolyte delivery pipeline;

[0033] 30 is a hydrogen separation device, 31 is a second electrolyte delivery pipeline;

[0034] 40 is a circulation pump;

[0035] 50 is a gas collecting and separating device, 51 is an electrolyte inlet, 52 is an electrolyte outlet, 53 is an exhaust port, 531 is an exhaust valve, 54 is an observation window, and 55 is a separation component;

[0036] 60 is a connecting pipeline. DETAILED DESCRIPTION

[0037] The core of the present invention is to disclose a hydrogen production system, reduce the occurrence of hydrogen-oxygen mixing in the hydrogen production system, and ensure the safe operation of the hydrogen production system.

[0038] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0039] like Figure 2-Figure 3 As shown, an embodiment of the present invention discloses a hydrogen production system, including an electrolyzer 10, an oxygen separation device 20, a hydrogen separation device 30, a circulation pump 40 and a gas collection and separation device 50.

[0040] Specifically, the oxygen outlet of the electrolyzer 10 is connected to the inlet of the oxygen separation device 20, the oxygen separation device 20 separates and collects the oxygen in the electrolyte, and the outlet of the oxygen separation device 20 is connected to the first electrolyte delivery pipeline 21, so as to re-deliver the electrolyte from which the oxygen is separated to the electrolyzer 10 for recycling. The hydrogen outlet of the electrolyzer 10 is connected to the inlet of the hydrogen separation device 30, the hydrogen separation device 30 separates and collects the hydrogen in the electrolyte, and the outlet of the hydrogen separation device 30 is connected to the second electrolyte delivery pipeline 31, so as to re-deliver the electrolyte from which the hydrogen is separated to the electrolyzer 10 for recycling. The arrows in the figure indicate the flow direction of the medium.

[0041] The first electrolyte delivery pipeline 21 and the second electrolyte delivery pipeline 31 merge into the electrolyte delivery pipeline 11, and the electrolyte delivery pipeline 11 is connected to the electrolyte inlet of the electrolytic cell 10. The circulation pump 40 is arranged on the electrolyte delivery pipeline to provide power for the electrolyte to flow back to the electrolytic cell 10. The circulation pump 40 is preferably a variable frequency pump.

[0042] The gas collecting and separating device 50 includes at least one, and is connected to at least one of the first electrolyte delivery pipeline 21 and the second electrolyte delivery pipeline 31, and is preferably arranged at the high point of the first electrolyte delivery pipeline 21 and the second electrolyte delivery pipeline 31. An exhaust port 53 is arranged on the top of the gas collecting and separating device 50. When the electrolyte carrying oxygen passes through the gas collecting and separating device 50, the oxygen floats up, is collected in the gas collecting and separating device 50, and is discharged through the exhaust port 53; when the electrolyte carrying hydrogen passes through the gas collecting and separating device 50, the hydrogen floats up, is collected in the gas collecting and separating device 50, and is discharged through the exhaust port 53. The gas discharged through the exhaust port 53 can be discharged into the air. Since the amount discharged each time is small, it can be quickly diluted by the surrounding air. Of course, the gas discharged through the exhaust port 53 can also be discharged to a designated location through a pipeline.

[0043] It should be noted that the electrolyzer 10 includes one or more, and the number of the oxygen separation device 20 and the hydrogen separation device 30 can be one. When the electrolyzer 10 includes multiple, the oxygen outlet of each electrolyzer 10 can be connected to the oxygen separation device 20 through an oxygen delivery pipeline, and the hydrogen outlet of each electrolyzer 10 can be connected to the hydrogen separation device 30 through a hydrogen delivery pipeline.

[0044] Of course, the oxygen separation device 20 and the hydrogen separation device 30 can include multiple corresponding ones, and multiple electrolyzers 10 can share one oxygen separation device 20 and hydrogen separation device 30. The number of gas collection and separation devices 50 here includes at least one, which means that for any group of corresponding oxygen separation devices 20 and hydrogen separation devices 30, when the oxygen separation device 20 and the hydrogen separation device 30 include multiple groups, the number of gas collection and separation devices 50 is set corresponding to the number of oxygen separation devices 20 and hydrogen separation devices 30.

[0045] The hydrogen production system disclosed in the embodiment of the present invention includes a gas collection and separation device 50, which includes at least one gas collection and separation device 50, which is connected to at least one of the first electrolyte delivery pipeline 21 and the second electrolyte delivery pipeline 31. In the first electrolyte delivery pipeline 21 and the second electrolyte delivery pipeline 31, the hydrogen and oxygen in the electrolyte flow with the electrolyte. When the electrolyte flows through the gas collection and separation device 50, since the density of the gas is less than the density of the electrolyte and it does not circulate with the electrolyte, the hydrogen and oxygen in the electrolyte are freed from the electrolyte, float up and gather at the top of the gas collection and separation device 50. The gas collection and separation device 50 collects the precipitated and free hydrogen and oxygen from the electrolyte, so that they will not flow back into the hydrogen separation device 30 and the oxygen separation device 20, and can be discharged through the exhaust port 53 on the top, and corresponding treatment is performed on them, which effectively blocks the path of gas mixing, reduces the possibility of hydrogen and oxygen mixing, and keeps the hydrogen and oxygen mixing concentration in the hydrogen separation device 30 and the oxygen separation device 20 at a minimum, thereby reducing the risk of explosion in the hydrogen production system and improving the safety of the hydrogen production system; at the same time, it can protect the circulation pump, reduce the probability of vacuum, and ensure the safe operation of the hydrogen production system.

[0046] Furthermore, if Figure 4 As shown, the gas collection and separation device 50 is provided with an electrolyte inlet 51 and an electrolyte outlet 52. The electrolyte inlet 51 is provided on the side wall of the gas collection and separation device 50, and the electrolyte outlet 52 is provided at the bottom of the gas collection and separation device 50. The electrolyte flowing out of the oxygen separation device 20 and / or the hydrogen separation device 30 flows into the gas collection and separation device 50 through the electrolyte inlet 51, flows out through the electrolyte outlet 52, and flows back to the electrolytic cell 10 through the electrolyte delivery pipeline 11. The gas collection and separation device 50 is preferably in the form of a tank body to facilitate gas collection.

[0047] Furthermore, in some specific embodiments, Figure 2 As shown, the gas collecting and separating devices 50 include two, one of which is arranged on the first electrolyte delivery pipeline 21, and the other is arranged on the second electrolyte delivery pipeline 31, preferably arranged near the outlet of the oxygen separation device 20 and the outlet of the hydrogen separation device 30. It should be noted that the two here refer to the arrangement of one oxygen separation device 20 and one hydrogen separation device 30. When the oxygen separation device 20 and the hydrogen separation device 30 include corresponding multiple ones, the gas collecting and separating devices 50 include multiple ones corresponding to the oxygen separation device 20 and the hydrogen separation device 30 one by one.

[0048] The electrolyte flowing out of the oxygen separation device 20 enters from the electrolyte inlet 51 of one of the gas collection and separation devices 50, and the oxygen precipitated and free in the electrolyte floats up and is collected in the gas collection and separation device 50, and is discharged from the exhaust port 53. The electrolyte is discharged through the electrolyte outlet 52 at the bottom and enters the electrolytic cell 10 for recycling. The electrolyte flowing out of the hydrogen separation device 30 enters from the electrolyte inlet 51 of another gas collection and separation device 50, and the hydrogen precipitated and free in the electrolyte floats up and is collected in the gas collection and separation device 50, and is discharged from the exhaust port 53. The electrolyte is discharged through the electrolyte outlet 52 at the bottom and enters the electrolytic cell 10 for recycling.

[0049] The inventors found through experiments that by respectively arranging the gas collection and separation device 50 on the first electrolyte delivery pipeline 21 and the second electrolyte delivery pipeline 31, the hydrogen peroxide mixing ratio is reduced to 10%, which greatly reduces the hydrogen peroxide mixing ratio and improves the safety performance of the hydrogen production system.

[0050] Further, in some specific embodiments, the gas collection and separation device 50 includes one, and is disposed on one of the first electrolyte delivery pipeline 21 and the second electrolyte delivery pipeline 31. For example, the gas collection and separation device 50 is disposed on the first electrolyte delivery pipeline 21, and is not disposed on the second electrolyte delivery pipeline 31, the electrolyte flowing out of the oxygen separation device 20 enters from the electrolyte inlet 51 of the gas collection and separation device 50, the oxygen precipitated and free in the electrolyte floats up, is collected in the gas collection and separation device 50, and is discharged from the exhaust port 53, and the electrolyte is discharged through the electrolyte outlet 52 at the bottom. At this time, if the precipitated and free hydrogen in the second electrolyte delivery pipeline 31 enters the first electrolyte delivery pipeline 21, when passing through the gas collection and separation device 50, the hydrogen floats up and is collected in the gas collection and separation device 50, and is discharged through the exhaust port 53 at the top. The hydrogen will not enter the oxygen separation device 20. The setting of the gas collection and separation device 50 blocks the path of hydrogen mixing, thereby reducing the possibility of hydrogen mixing in the oxygen separation device 20. When the gas collection and separation device 50 is set on the second electrolyte delivery pipeline 31, the principle is the same as that of being set on the first electrolyte delivery pipeline 21, and it will not be repeated.

[0051] Furthermore, in some specific embodiments, Figure 3As shown, the gas collection and separation device 50 includes a connecting pipeline 60 disposed between the first electrolyte delivery pipeline 21 and the second electrolyte delivery pipeline 31. The height of the connecting pipeline 60 is higher than the height of the first electrolyte delivery pipeline 21 and the second electrolyte delivery pipeline 31. The gas collection and separation device 50 is disposed on the connecting pipeline 60. The oxygen in the first electrolyte delivery pipeline 21 and the hydrogen in the second electrolyte delivery pipeline 31 float upward during the flow process, enter the connecting pipeline 60, gather in the gas collection and separation device 50, and are discharged from the exhaust port 53 at the top of the gas collection and separation device 50, thereby reducing the occurrence of hydrogen oxidation mixing in the oxygen separation device 20 and the hydrogen separation device 30.

[0052] Further, in order to separate the electrolyte carried by oxygen and hydrogen, in some specific embodiments, as Figure 5 As shown, a separation assembly 55 is provided in the gas collection and separation device 50, and an air inlet hole is provided on the side wall of the separation assembly 55. The separation assembly 55 is provided with a gas passage connected with the exhaust port 53. When the gas passes through the separation assembly 55, it is blocked by the bottom plate at the bottom of the separation assembly 55, and the gas flow direction is changed. The gas enters the separation assembly 55 through the air inlet hole on the side wall. Due to the change in the gas flow direction, the electrolyte carried in the gas falls to the bottom of the gas collection and separation device 50 under the action of gravity and is discharged through the electrolyte outlet 52.

[0053] Furthermore, in some other specific embodiments, a filter screen or a diaphragm is provided in the gas collection and separation device 50, and the bottom height of the filter screen or the diaphragm is higher than the height of the electrolyte inlet 51, so as to separate the electrolyte carried in the gas.

[0054] Furthermore, for the convenience of observation, an observation window 54 is provided on the gas collection and separation device 50, and the arrangement of the observation window 54 facilitates the observation of the circulation state of the electrolyte. Figure 2-Figure 3 As shown, an exhaust valve 531 is provided on the exhaust port of the gas collecting and separating device 50. The exhaust valve 531 can be an automatic exhaust valve or a manual exhaust valve, and an automatic exhaust valve is preferred.

[0055] It should be noted that 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.

[0056] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0057] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A hydrogen production system, characterized in that: include: Electrolyzer (10); An oxygen separation device (20), wherein the oxygen outlet of the electrolytic cell (10) is connected to the inlet of the oxygen separation device (20), and the outlet of the oxygen separation device (20) is connected to the first electrolyte delivery pipeline (21); A hydrogen separation device (30), wherein the hydrogen outlet of the electrolytic cell (10) is connected to the inlet of the hydrogen separation device (30), and the outlet of the hydrogen separation device (30) is connected to the second electrolyte delivery pipeline (31); a circulation pump (40), wherein the first electrolyte delivery pipeline (21) and the second electrolyte delivery pipeline (31) merge into an electrolyte delivery pipeline (11), the electrolyte delivery pipeline (11) is connected to an electrolyte inlet of the electrolytic cell (10), and the circulation pump (40) is arranged on the electrolyte delivery pipeline (11); A gas collecting and separating device (50), the gas collecting and separating device (50) comprising at least one gas collecting and separating device (50) being connected to at least one of the first electrolyte delivery pipeline (21) and the second electrolyte delivery pipeline (31), and an exhaust port (53) being provided at the top of the gas collecting and separating device (50).

2. The hydrogen production system according to claim 1, characterized in that: The gas collection and separation device (50) is provided with an electrolyte inlet (51) and an electrolyte outlet (52); the electrolyte inlet (51) is provided on the side wall of the gas collection and separation device (50), and the electrolyte outlet (52) is provided at the bottom of the gas collection and separation device (50); the electrolyte flowing out of the oxygen separation device (20) and / or the hydrogen separation device (30) flows into the gas collection and separation device (50) through the electrolyte inlet (51) and flows out from the electrolyte outlet (52).

3. The hydrogen production system according to claim 2, characterized in that: The gas collection and separation devices (50) include two devices, one of which is arranged on the first electrolyte delivery pipeline (21), and the other is arranged on the second electrolyte delivery pipeline (31).

4. The hydrogen production system according to claim 2, characterized in that: The gas collection and separation device (50) comprises one device, which is arranged on one of the first electrolyte delivery pipeline (21) and the second electrolyte delivery pipeline (31).

5. The hydrogen production system according to claim 1, characterized in that: The gas collection and separation device (50) comprises a connecting pipeline (60) provided between the first electrolyte delivery pipeline (21) and the second electrolyte delivery pipeline (31), the height of the connecting pipeline (60) being higher than the height of the first electrolyte delivery pipeline (21) and the second electrolyte delivery pipeline (31), and the gas collection and separation device (50) being provided on the connecting pipeline (60).

6. The hydrogen production system according to claim 2, characterized in that: A separation component (55) is provided in the gas collection and separation device (50), an air inlet hole is provided on a side wall of the separation component (55), and a gas passage communicating with the exhaust port (53) is provided in the separation component (55).

7. The hydrogen production system according to claim 2, characterized in that: A filter screen or a diaphragm is provided in the gas collection and separation device (50), and the bottom height of the filter screen or the diaphragm is higher than the height of the electrolyte inlet (51).

8. The hydrogen production system according to any one of claims 1 to 7, characterized in that: The gas collecting and separating device (50) is provided with an observation window (54).

9. The hydrogen production system according to any one of claims 1 to 7, characterized in that: An exhaust valve (531) is provided on the exhaust port (53) of the gas collecting and separating device (50).

10. The hydrogen production system according to claim 1, characterized in that: The electrolytic cells (10) include a plurality of electrolytic cells (10), wherein the oxygen outlet of each electrolytic cell (10) is connected to the inlet of the oxygen separation device (20) via an oxygen pipeline, and the hydrogen outlet of each electrolytic cell (10) is connected to the inlet of the hydrogen separation device (30) via a hydrogen pipeline.

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