Electrolytic hydrogen production system and electrolytic hydrogen production method capable of adapting to power fluctuations

Abstract

The application discloses a sustainable electrolysis hydrogen production system and method which can adapt to power fluctuation. The electrolysis cell of the electrolysis hydrogen production system comprises n electrolysis sections (6). Each electrolysis section (6) comprises 2y electrolysis chambers (5), two cathode end plates (2) and one anode middle plate (1). The two cathode end plates (2) are located at the two ends of the electrolysis section (6), and the anode middle plate (1) is located in the middle of the electrolysis section (6). Each electrolysis section (6) is divided into left and right parts, and each part comprises y electrolysis chambers (5). Wherein n is greater than 1, y is greater than 1, and the n electrolysis sections (6) are arranged in series from 1 to n. The electrolysis cell of the electrolysis hydrogen production system comprises n electrolysis sections (6). The electrolyte in the electrolysis cell of each electrolysis section (6) has a constant temperature during operation, so that the electrolysis hydrogen production system of the application can be continuously regulated under fluctuating power conditions, has strong adaptability, is more suitable for fluctuating power input conditions, and has higher safety performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrolytic hydrogen production, in particular to a sustainable electrolytic hydrogen production system and method capable of adapting to power fluctuations. BACKGROUND

[0002] Water electrolysis hydrogen production technology produces green hydrogen, which is of great significance to achieving the dual carbon goal and plays an important role in improving the utilization rate of wind power and photovoltaic power resources, grid peak shaving, etc. Renewable power such as wind power and photovoltaic power has the characteristics of obvious intermittency, volatility and randomness, especially wind power, which is more random and volatile, making it difficult to provide stable power for water electrolysis devices.

[0003] Therefore, there is an urgent need for a water electrolysis hydrogen production system and method that can adapt to unstable power generation of wind power and photovoltaic power plants, has a wide power adjustment range, and does not shorten the running life of the device and reduce the purity of hydrogen products due to large power fluctuations.

[0004] In order to solve the above problems, the present application is proposed. SUMMARY

[0005] In view of the shortcomings of the prior art, the present application provides a sustainable electrolytic hydrogen production system and control method capable of adapting to power fluctuations. In order to adapt to the irregular fluctuation characteristics of new energy, the electrolytic cell of the electrolytic hydrogen production system of the present application comprises n electrolytic segments 6, each electrolytic segment 6 comprises 2y electrolytic chambers 5, two cathode end plates 2 and one anode middle plate 1, n electrolytic segments 6 are arranged in series from 1 to n, and the two cathode end plates 2 at both ends of two adjacent electrolytic segments 6 are shared. The power of each electrolytic segment 6 can be individually regulated, while multiple electrolytic segments 6 are connected and run, and the electrolyte in each electrolytic segment 6 is constantly at a constant temperature during operation, so that the electrolytic hydrogen production system of the present application can be continuously regulated under fluctuating power conditions, has strong adaptability, is more suitable for fluctuating power input conditions, and has better safety performance.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present application is:

[0007] In order to solve the above-mentioned technical problems, the present application divides the entire electrolytic cell into multiple segments, and the internal structures of each segment are consistent. The electrolytic hydrogen production system of the present application not only adapts to the irregular fluctuation characteristics of new energy, but also takes into account the problems that the current density should not be too high and the fluctuation should not be too large during electrolysis. The electrolytic cell of the electrolytic hydrogen production system of the present application comprises n electrolytic segments 6, each electrolytic segment 6 is divided into left and right parts, and comprises 2y electrolytic chambers 5. The voltage of a single electrolytic chamber 5 is designed to be 1.85V, so the total required voltage U is n x y x 1.85V (n is the number of electrolytic cell segments, and 2y is the number of small electrolytic chambers). The power of the device is adjusted by controlling the current of each segment.

[0008] The first aspect of the present application provides a sustainable electrolytic hydrogen production system that can adapt to power fluctuations, wherein the electrolytic cell of the electrolytic hydrogen production system comprises n electrolytic segments 6, each of which comprises 2y electrolytic chambers 5, two cathode end plates 2 and one anode middle plate 1, the two cathode end plates 2 are located at the two ends of the electrolytic segment 6, and the anode middle plate 1 is located in the middle of the electrolytic segment 6, each of the electrolytic segments 6 is divided into left and right parts, each part comprises y electrolytic chambers 5; wherein n is greater than 1, y is greater than 1, and the n electrolytic segments 6 are arranged in series from 1 to n.

[0009] Preferably, the two cathode end plates 2 at the two ends of two adjacent electrolytic segments 6 are shared.

[0010] Preferably, the electrolytic hydrogen production system further comprises an electrolytic alkali outlet 3 and an electrolytic alkali inlet 4.

[0011] The electrolytic alkali outlet 3 is located at the upper end of the electrolytic hydrogen production system.

[0012] The electrolytic alkali inlet 4 is located at the lower end of the electrolytic hydrogen production system.

[0013] In order to avoid the dissolution of hydrogen and oxygen mixture, the electrolytic alkali outlet 3 and the electrolytic alkali inlet 4 are symmetrically arranged at the two ends of the electrolytic cell, and the electrolyte carrying oxygen and the electrolyte carrying hydrogen are separated to participate in the gas-liquid separation and cooling circulation process.

[0014] Preferably, the electrolytic alkali outlet 3 and the electrolytic alkali inlet 4 are four, and are evenly distributed at the two ends of the electrolytic cell, two of which are oxygen ends, and the other two are hydrogen ends.

[0015] The four electrolytic alkali outlets 3 are symmetrically arranged at the two ends of the electrolytic cell.

[0016] The four electrolytic alkali inlets 4 are symmetrically arranged at the two ends of the electrolytic cell.

[0017] Preferably, each electrolytic chamber 5 has an electrolytic chamber independent inlet 7 and an electrolytic chamber independent outlet 8. That is, the electrolyte of the electrolytic alkali inlet 4 is dispersed to the multiple electrolytic chamber independent inlets 7, and the electrolyte of the multiple electrolytic chamber independent outlets 8 is collected to the electrolytic alkali outlet 3.

[0018] Preferably, the electrolytic alkali outlet 3 is a total flow channel outlet connected to the electrolytic chambers 5 in the electrolytic cell at the upper end of each segment, and the electrolytic alkali inlet 4 is a total flow channel inlet connected to the electrolytic chambers 5 in the electrolytic cell at the lower end of each segment.

[0019] Preferably, the electrolytic alkali liquor outlet 3 is connected to a gas-liquid separation device, and the electrolytic liquor carrying gas in each electrolytic chamber 5 flows out from the electrolytic alkali liquor outlet 3 at both ends and enters the gas-liquid separation device.

[0020] Preferably, the electrolytic liquor after gas-liquid separation flows into a cooling circulation device connected to the outer end pipe of the electrolytic alkali liquor inlet 4, and the cooled electrolytic liquor flows into the electrolytic tank communication flow channel from the electrolytic alkali liquor inlet 4 at both ends and flows into each electrolytic chamber 5.

[0021] Although the electrolytic tank of the electrolytic hydrogen production system is divided into n electrolytic sections 6, the consistency of the input power and the consistency of the electrolysis temperature in the tank are maintained after the segmentation. In the case of continuous power fluctuation, this temperature characteristic makes the electrolytic system respond faster to the control of the control system, and is more suitable for fluctuating power input conditions.

[0022] Preferably, the electrolytic hydrogen production system further comprises a power input copper bar 9, one end of which is connected to a power source, and the current flows from the power input copper bar 9 into the electrolytic tank, and the other end of the power input copper bar 9 is connected to a rectifier cabinet to control the current input into the electrolytic hydrogen production system. When power fluctuation or failure occurs in one of the 1-n electrolytic sections 6, since the internal structure of the 1-n electrolytic sections 6 is basically the same, in order to adapt to the segmented control of the electrolytic tank, the input power of the corresponding power input copper bar 9 in the 1-n electrolytic sections 6 is adjusted to change the input power, so that the rated current of each section is consistent, but the actual running current can be adjusted within 0-100% of the rated current.

[0023] In order for the electrolytic hydrogen production system to operate normally, the electrolytic hydrogen production system of the present application further comprises other commonly used components in addition to the above-mentioned components.

[0024] The second aspect of the present application provides an electrolytic hydrogen production method of the electrolytic hydrogen production system of the first aspect of the present application. When the external power load fluctuates in the range of 75%+m×25% / n-100% of the rated current, the current of the m-1 electrolytic section 6 is maintained at 75% of the rated current, and the current of the m electrolytic section 6 is automatically adjusted in the range of 75%-100% of the rated current according to the power load.

[0025] When the external power load continues to decrease in the range of 50%+m×25% / n-75% of the rated current, the current of the m-1 electrolytic section 6 is maintained at 50% of the rated current, and the current of the m electrolytic section 6 is automatically adjusted in the range of 50%-75% of the rated current according to the power load.

[0026] When the external power load continues to drop in the range of 25%+m*25% / n~50% of the rated current, the power supply of the m-1th electrolysis section 6 is turned off, and the current of the mth electrolysis section 6 is automatically adjusted according to the power load in the range of 25%~50% of the rated current;

[0027] When the external power load increases, the system automatically recovers the current of the electrolysis section 6 in the reverse order of the shutdown sequence, so that the electrolytic hydrogen production system can be continuously and automatically adjusted when the power load fluctuates in the range of 25%~100% of the rated current, thereby reducing the influence of the fluctuation of the external power load on the electrolytic hydrogen production system.

[0028] Wherein, m is an integer and m<=n.

[0029] The step of the above power supply section adjustment is 25% / n, which can be adjusted according to the actual situation, and the step can be set lower, such as 20% / n, if necessary.

[0030] In the system, multi-section electrolytic cells are used for electrolysis, two outer ends of any section in the multi-section are cathode end plates, and the middle is an anode middle plate. When the current is transmitted through the copper bar into the electrolytic cell, electrolysis starts to occur, the upper electrolyte carries the generated gas into the communication flow channel, and is discharged from the electrolytic cell into the separation system. The electrolyte containing gas is separated by the separation device and then enters the cooling device. After cooling, the cooled alkali solution flows back to the electrolytic cell through the lower communication flow channel, and the gas-liquid separation process and the alkali cooling process are completed. One electrolytic cell can contain multiple electrolytic chambers, but they are all connected to the total flow channel of the communication flow channel to ensure the communication between the electrolytic cells. The power input into each electrolytic cell is controlled by the rectifier cabinet before the copper bar.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] 1. The electrolytic hydrogen production system of the present application comprises n electrolysis sections 6, each of which is divided into left and right parts, and comprises 2y electrolytic chambers 5, two cathode end plates 2 and an anode middle plate 1. The n electrolysis sections 6 are arranged continuously from 1 to n, the power of each electrolysis section 6 can be individually controlled, and multiple electrolysis sections 6 are connected and run, and the electrolyte in each electrolysis section 6 has a constant temperature during operation, so that the electrolytic hydrogen production system of the present application can be continuously controlled under fluctuating power supply conditions, has strong adaptability, is more suitable for fluctuating power supply conditions, and has higher safety performance.

[0033] 2. In a multi-segment electrolyzer design, each segment operates relatively independently. When a fault occurs in one segment's electrolysis chamber, other segments remain unaffected due to their independent power supply to the copper busbars. Even when the corresponding protection mechanism activates, the water electrolysis hydrogen production system continues to operate normally, effectively meeting production demands and providing a buffer against faults. Specifically, when power adjustment is required, controlling the current input to each electrolyzer segment via the copper busbars allows for partial power adjustment, resulting in a wider overall adjustment range for the electrolyzer, with a load capacity ranging from 20% to 150% of the rated power.

[0034] 3. After segmented control, it is equivalent to connecting the various electrolytic cells in series, which can ensure a consistent overall current. The voltage drop across each electrolytic cell is the total input voltage U divided by the number of segments n. For each electrolytic cell segment, while ensuring the electrolytic current, the voltage drop between the positive and negative electrodes is reduced, thus better ensuring the safety performance of the device.

[0035] 4. When starting an electrolytic cell at a certain power, the start-up time is related to the initial temperature. A low initial temperature during electrolysis will increase the start-up time. When centralized liquid inlet and interconnected flow channels are enabled, the electrolyte temperature remains constant across all sections under interconnected conditions. When facing power fluctuations in standby mode, the electrolytic cell can operate at a higher than rated load for a short time due to the relatively consistent operating temperature within the cell. This allows the electrolytic cell to reach high-efficiency operation more quickly in the face of power input fluctuations. The control method of this application enables the electrolytic cell to respond quickly in low-power standby mode, reducing heat dissipation during operating condition fluctuations, fully utilizing electrical energy, and improving the energy utilization efficiency of the system in application. Attached Figure Description

[0036] Figure 1 Here is a schematic diagram of the electrolytic hydrogen production system of this invention:

[0037] The attached diagram is described as follows: 1. Anode middle plate; 2. Cathode end plate; 3. Electrolytic alkali outlet; 4. Electrolytic alkali inlet; 5. Electrolysis chamber (2y units); 6. Electrolysis section (n sections); 7. Independent inlet for electrolysis chamber; 8. Independent outlet for electrolysis chamber; 9. Power supply copper busbar. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the embodiments.

[0039] Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be construed as limiting the scope of the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed in accordance with the techniques or conditions described in the literature in the field or according to the product instructions. Materials or equipment whose manufacturers are not specified are all conventional products that can be obtained by purchase.

[0040] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” to another element, it can be directly connected to the other element, or there may be an intermediate element. Furthermore, the term “connected” as used herein can include wireless connections.

[0041] In the description of this invention, unless otherwise stated, "a plurality of" means two or more. The terms "inner," "upper," "lower," etc., indicate the orientation or state relationship based on the orientation or state relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "equipped with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0044] like Figure 1 As shown, the electrolyzer of the electrolytic hydrogen production system that can sustainably adapt to power fluctuations in this embodiment includes n electrolysis sections 6. Each electrolysis section 6 includes 2y electrolysis chambers 5, two cathode end plates 2, and one anode middle plate 1. The two cathode end plates 2 are located at both ends of the electrolysis section 6, while the anode middle plate 1 is located in the middle of the electrolysis section 6. Each electrolysis section 6 is divided into left and right parts, each part including y electrolysis chambers 5. The left and right parts are located on both sides of the anode middle plate 1, respectively. Wherein n is greater than 1, y is greater than 1, and the n electrolysis sections 6 are arranged in series from 1 to n.

[0045] Two cathode end plates 2 at both ends of two adjacent electrolytic segments 6 are shared.

[0046] The electrolytic hydrogen production system further comprises an electrolytic lye outlet 3 and an electrolytic lye inlet 4;

[0047] The electrolytic lye outlet 3 is located at the upper end of the electrolytic hydrogen production system;

[0048] The electrolytic lye inlet 4 is located at the lower end of the electrolytic hydrogen production system.

[0049] In order to avoid the dissolution of hydrogen and oxygen mixture, the electrolytic lye outlet 3 and the electrolytic lye inlet 4 are symmetrically arranged at both ends of the electrolytic cell, and the electrolyte carrying oxygen and the electrolyte carrying hydrogen are separated to participate in the gas-liquid separation and cooling circulation process.

[0050] The electrolytic lye outlet 3 and the electrolytic lye inlet 4 are both four, and are evenly distributed at both ends of the electrolytic cell, two of which are oxygen ends, and the other two are hydrogen ends;

[0051] The four electrolytic lye outlets 3 are symmetrically arranged at both ends of the electrolytic cell;

[0052] The four electrolytic lye inlets 4 are symmetrically arranged at both ends of the electrolytic cell.

[0053] Each electrolytic chamber 5 has an electrolytic chamber independent inlet 7 and an electrolytic chamber independent outlet 8.

[0054] The electrolytic lye outlet 3 is a total flow channel outlet connected to the electrolytic chamber 5 in the upper end of each electrolytic cell, and the electrolytic lye inlet 4 is a total flow channel inlet connected to the electrolytic chamber 5 in the lower end of each electrolytic cell;

[0055] The electrolytic lye outlet 3 is connected to the gas-liquid separation device through a pipeline, and the electrolyte carrying gas in each electrolytic chamber 5 flows out from the electrolytic lye outlet 3 at both ends and enters the gas-liquid separation device.

[0056] The electrolyte after gas-liquid separation flows into the cooling circulation device, and the cooling circulation device is connected to the electrolytic lye inlet 4 through a pipeline, and the cooled electrolyte flows into the electrolytic cell through the electrolytic lye inlet 4 at both ends and flows into each electrolytic chamber 5.

[0057] Although the electrolytic cell of the electrolytic hydrogen production system is divided into n electrolytic segments 6, the consistent input power and the consistent electrolytic temperature in the cell are still maintained. Under the condition of continuous power fluctuation, this temperature characteristic makes the response speed of the electrolytic system to the control system regulation faster, and more suitable for the fluctuating power input condition.

[0058] The electrolytic hydrogen production system further comprises a power supply access copper bar 9, one end of the power supply access copper bar 9 is connected with a power supply, current flows from the power supply access copper bar 9 into the electrolytic cell, the other end of the power supply access copper bar 9 is connected with a rectifier cabinet to control the current accessed to the electrolytic hydrogen production system. When power fluctuation or failure occurs in some electrolytic cell of the 1-n electrolytic section 6, since the internal structure of the 1-n electrolytic section 6 is basically consistent, in order to adapt to the segmented control of the electrolytic cell, the input power of the corresponding power supply access copper bar 9 of the 1-n electrolytic section 6 is adjusted to change the input power, so that the rated current of each section is consistent, but the actual running current can be adjusted in the range of 0-100% of the rated current.

[0059] In order to ensure the normal operation of the electrolytic hydrogen production system, the electrolytic hydrogen production system further comprises other commonly used components in addition to the above-mentioned components.

[0060] The electrolytic hydrogen production method of the electrolytic hydrogen production system, when the external power supply load fluctuates in the range of 75%+m×25% / n-100% of the rated current, the current of the m-1 electrolytic section 6 is maintained at 75% of the rated current, and the current of the m electrolytic section 6 is automatically adjusted in the range of 75%-100% of the rated current according to the power supply load;

[0061] When the external power supply load continues to decrease in the range of 50%+m×25% / n-75% of the rated current, the current of the m-1 electrolytic section 6 is maintained at 50% of the rated current, and the current of the m electrolytic section 6 is automatically adjusted in the range of 50%-75% of the rated current according to the power supply load;

[0062] When the external power supply load continues to decrease in the range of 25%+m×25% / n-50% of the rated current, the power supply of the m-1 electrolytic section 6 is turned off, and the current of the m electrolytic section 6 is automatically adjusted in the range of 25%-50% of the rated current according to the power supply load;

[0063] When the external power supply load increases, the system automatically recovers the current of the electrolytic section 6 in the reverse order of the shutdown, thereby realizing the continuous automatic adjustment of the electrolytic hydrogen production system in the range of 25%-100% of the rated current, so as to reduce the influence of the external power supply load fluctuation on the electrolytic hydrogen production system;

[0064] Wherein, m is an integer and m≤n.

[0065] The system of the present application adopts multi-section electrolytic tank, the two outer ends of any section of the multi-section are cathode end plates, and the middle is anode middle plate. When the current is transmitted by copper row into the electrolytic tank, electrolysis starts to occur, the upper electrolyte carries the generated gas into the communication flow channel, and is discharged from the electrolytic tank into the separation system. The electrolyte containing gas is separated by the separation device, and then enters the cooling device. After cooling, the cooled alkali solution flows back to the electrolytic tank through the lower communication flow channel, and the gas-liquid separation process and the alkali cooling process are completed. One section of electrolytic tank can contain multiple electrolytic chambers, but they are all connected with the total flow channel of the communication flow channel to ensure the communication between the electrolytic tanks. The power input into each electrolytic tank is controlled by the rectifier cabinet before the copper row.

[0066] Taking 380V voltage electrolysis as an example, if three-section type is used, i.e. n=3 in the electrolysis section 6. The electrolytic tank is provided with 168 electrolytic chambers 5, and there are 56 (y=28) electrolytic chambers 5 in each section on average. If the design is 1.85V / chamber, the total voltage of the power supply should be 156V, and the voltage of each section is 52V.

Claims

1. A sustainable hydrogen production system that adapts to power fluctuations via electrolysis, characterized in that, The electrolytic cell of the electrolytic hydrogen production system includes n electrolytic sections (6), each electrolytic section (6) includes 2y electrolytic chambers (5), two cathode end plates (2), and one anode middle plate (1). The two cathode end plates (2) are located at both ends of the electrolytic section (6), while the anode middle plate (1) is located in the middle of the electrolytic section (6). Each electrolytic section (6) is divided into left and right parts, each part including y electrolytic chambers (5); where n is greater than 1, y is greater than 1, and the n electrolytic sections (6) are arranged in series from 1 to n. The cathode end plates (2) at both ends of the two adjacent electrolysis sections (6) are shared; The electrolytic hydrogen production system also includes a power supply copper busbar (9), one end of which is connected to a power source, and current flows from the power supply copper busbar (9) into the electrolytic cell. The other end of the power supply copper busbar (9) is connected to a rectifier cabinet to control the current connected to the electrolytic hydrogen production system.

2. The electrolytic hydrogen production system that can sustainably adapt to power fluctuations according to claim 1, characterized in that, The electrolytic hydrogen production system also includes an electrolytic alkali outlet (3) and an electrolytic alkali inlet (4). The electrolytic alkaline solution outlet (3) is located at the upper end of the electrolytic hydrogen production system; The electrolytic alkali inlet (4) is located at the lower end of the electrolytic hydrogen production system.

3. The electrolytic hydrogen production system that can sustainably adapt to power fluctuations according to claim 2, characterized in that, There are four electrolytic alkaline solution outlets (3) and four electrolytic alkaline solution inlets (4), which are evenly distributed at both ends of the electrolytic cell, two of which are oxygen ends and the other two are hydrogen ends; The four electrolytic alkali outlets (3) are symmetrically arranged at both ends of the electrolytic cell; The four electrolytic alkali inlets (4) are symmetrically arranged at both ends of the electrolytic cell.

4. The electrolytic hydrogen production system that can sustainably adapt to power fluctuations according to claim 2, characterized in that, Each electrolysis chamber (5) has an independent inlet (7) and an independent outlet (8).

5. The electrolytic hydrogen production system that can sustainably adapt to power fluctuations according to claim 2, characterized in that, The electrolytic alkali outlet (3) is the outlet of the main flow channel in the tank, connecting the upper electrolytic cells and the electrolysis chamber (5) in the section. The electrolytic alkali inlet (4) is the inlet of the main flow channel in the tank, connecting the lower electrolytic cells and the electrolysis chamber (5) in the section.

6. The electrolytic hydrogen production system that can sustainably adapt to power fluctuations according to claim 2, characterized in that, The external pipe of the electrolytic alkali outlet (3) is connected to the gas-liquid separation device. The electrolyte carrying gas in each of the electrolysis chambers (5) flows out from the electrolytic alkali outlets (3) at both ends and enters the gas-liquid separation device.

7. The electrolytic hydrogen production system that can sustainably adapt to power fluctuations according to claim 6, characterized in that, After gas-liquid separation, the electrolyte flows into the cooling circulation device, which is connected to the outer end pipe of the electrolytic alkali inlet (4). The cooled electrolyte flows into the electrolytic cell connecting channel from the electrolytic alkali inlets (4) at both ends and into each of the electrolysis chambers (5).

8. A method for producing hydrogen by electrolysis using the electrolysis hydrogen production system according to any one of claims 1-7, characterized in that, When the external power supply load fluctuates within the range of 75%+m×25% / n to 100% of the rated current, the current of the electrolysis section (6) from the first to the m-1th is maintained at 75% of the rated current, while the current of the electrolysis section (6) in the mth section is automatically adjusted according to the power supply load within the range of 75% to 100% of the rated current. When the external power supply load continues to decrease to within the range of 50%+m×25% / n to 75% of the rated current, the current of the electrolysis section (6) in the first to m-1 segments is maintained at 50% of the rated current, while the current of the electrolysis section (6) in the m segment is automatically adjusted according to the power supply load within the range of 50% to 75% of the rated current. When the external power supply load continues to drop to within the range of 25%+m×25% / n to 50% of the rated current, the power supply of the electrolysis section (6) from the first to the m-1th section is turned off, and the current of the electrolysis section (6) in the mth section is automatically adjusted according to the power supply load within the range of 25% to 50% of the rated current. When the external power load increases, the system automatically restores the current of the electrolysis section (6) in reverse order of shutdown, thereby realizing the continuous automatic adjustment of the electrolysis hydrogen production system when the rated current fluctuates between 25% and 100%, so as to reduce the impact of external power load fluctuation on the electrolysis hydrogen production system. Where m is an integer and m≤n.

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