Safety design method of electrolytic hydrogen production device and electrolytic hydrogen production device

Abstract

The invention discloses a safety design method of an electrolytic hydrogen production device. The electrolytic hydrogen production device comprises a cabinet body and hydrogen production equipment mounted in the cabinet body, the safety design method comprises the following steps: calculating the sum of effective volumes of devices containing hydrogen in the hydrogen production equipment under rated working pressure, and taking the obtained volume as the volume VH1 of the hydrogen in the hydrogen production equipment under the working pressure; converting the volume VH1 of the hydrogen under the working pressure into the volume VH2 of the hydrogen under the standard atmospheric pressure; when the hydrogen leaks into the cabinet body, the concentration of the hydrogen which does not explode is controlled to be smaller than 4%, and the safe volume V31 of the cabinet body is calculated to be larger than or equal to 24 times of the volume VH2 of the hydrogen under the standard atmospheric pressure. According to the safety design method of the electrolytic hydrogen production device, the concentration of hydrogen can be ensured to be at the lower limit of explosion, and the explosion danger can be effectively avoided. The invention further relates to an electrolytic hydrogen production device.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolytic hydrogen production, and in particular to a safety design method for an electrolytic hydrogen production device and the electrolytic hydrogen production device. Background Art

[0002] Hydrogen production equipment is a process system that produces hydrogen through water electrolysis. Currently, hydrogen production equipment is housed in a cabinet. However, the existing cabinet volume does not match the volume of hydrogen. Therefore, if hydrogen leaks from the hydrogen production equipment and the concentration exceeds 4%, it is prone to explosion, posing a safety hazard to the equipment's operation. Summary of the Invention

[0003] In view of this, the present invention provides a safety design method for an electrolytic hydrogen production device, which can ensure that the concentration of hydrogen is within the lower explosion limit and effectively avoid the risk of explosion.

[0004] A safety design method for an electrolytic hydrogen production device, the electrolytic hydrogen production device comprising a cabinet and hydrogen production equipment installed in the cabinet; the safety design method comprising: calculating the sum of the effective volumes of components containing hydrogen in the hydrogen production equipment at a rated working pressure, and using the obtained volume as the volume V of the hydrogen in the hydrogen production equipment at the working pressure. H 1. The volume of hydrogen at working pressure V H 1Converted to the volume of hydrogen at standard atmospheric pressure V H 2. The hydrogen leaks into the cabinet, and the concentration of the hydrogen that does not explode is controlled to be less than 4%. The calculated safety volume V31 of the cabinet is greater than or equal to 24 times the volume V of the hydrogen at the standard atmospheric pressure. H 2.

[0005] Optionally, the hydrogen-containing device in the hydrogen production equipment includes a hydrogen-water separator, a drip collector and a dryer connected in series with the electrolyzer through a pipeline, and the volume of the hydrogen V H 1 is calculated by:

[0006] Calculating the volumes of the hydrogen-water separator, the drip trap, the dryer, and the pipeline containing hydrogen;

[0007] The volumes of the hydrogen-water separator, the drip collector, the dryer, and the hydrogen-containing pipeline are summed and multiplied by a surplus coefficient, where the surplus coefficient is greater than 1.

[0008] Optionally, when oxygen generated by the hydrogen production equipment leaks into the cabinet, the safety design method includes:

[0009] Calculate the sum of the effective volumes of the components containing oxygen in the hydrogen production equipment at the rated working pressure, and use the obtained volume as the volume V of the oxygen in the hydrogen production equipment at the working pressure. O 1;

[0010] The volume V of the oxygen at the working pressure O 1 converted to the volume of oxygen at standard atmospheric pressure V O 2;

[0011] The concentration of oxygen is controlled to be less than 23.5% so as not to produce an oxygen-rich environment. The calculated safety volume V32 of the cabinet is greater than or equal to 31.6 times the volume V of oxygen at the standard atmospheric pressure. O 2;

[0012] Compare the volume V31 of the cabinet obtained by the hydrogen leakage calculation with the volume V32 of the cabinet obtained by the oxygen leakage calculation, and select the larger value as the safe volume of the cabinet.

[0013] Optionally, the oxygen-containing device in the hydrogen production equipment includes an oxygen-water separator connected to the electrolyzer via a pipeline, and the volume of the oxygen V O 1 is calculated by:

[0014] Calculate the volume V4 of the inner cavity of the oxygen-water separator and the volume V5 of the water in the oxygen-water separator, the volume V O 1 is equal to the difference between the volume V4 and the volume V5.

[0015] Optionally, the cabinet is provided with an exhaust fan and an air inlet, the exhaust fan is used to exhaust the air in the cabinet, and the design method of the minimum air volume of the exhaust fan includes:

[0016] Calculating the maximum hydrogen production of the electrolyzer, the minimum air volume of the exhaust fan is greater than or equal to 24 times the maximum hydrogen production of the electrolyzer;

[0017] Calculating the maximum oxygen production of the electrolytic cell, the minimum air volume of the exhaust fan is greater than or equal to 31.5 times the maximum oxygen production of the electrolytic cell;

[0018] The air volume of the exhaust fan obtained by the hydrogen leakage calculation is compared with the air volume of the exhaust fan obtained by the oxygen leakage calculation, and the larger value is selected as the minimum air volume of the exhaust fan.

[0019] Optionally, the cabinet body includes a frame, two cabinet doors, multiple outer shell panels, at least one telescopic flexible member and a driving mechanism, the two cabinet doors are connected to the front side of the frame in a switchable manner, multiple outer shell panels are connected to the area of the frame avoiding the cabinet doors, the telescopic flexible member is connected between at least one outer shell panel and the frame, the telescopic flexible member is arranged around the periphery of the outer shell panel, and the driving mechanism is used to drive the outer shell panel connected with the telescopic flexible member to telescopically move to change the volume of the cabinet body.

[0020] Optionally, the electrolysis hydrogen production device further includes a controller and a first sensor, wherein the controller is electrically connected to the first sensor and the driving mechanism respectively, and the first sensor is used to detect whether hydrogen leakage occurs in the hydrogen production equipment;

[0021] When the first sensor detects that hydrogen leakage occurs in the hydrogen production equipment, the controller controls the driving mechanism to drive the outer shell plate to move, so that the volume of the cabinet increases to the safety volume V31.

[0022] Optionally, the electrolysis hydrogen production device further includes a second sensor, the controller is electrically connected to the second sensor, and the second sensor is used to detect whether oxygen leakage occurs in the hydrogen production equipment;

[0023] When the second sensor detects that oxygen leakage occurs in the hydrogen production equipment, the controller controls the driving mechanism to drive the outer shell plate to move, so that the volume of the cabinet increases to the safety volume V32.

[0024] Optionally, the electrolytic hydrogen production device further includes a circulation fan, which is installed in the cabinet and is used to maintain air flow in the cabinet.

[0025] The present application also relates to an electrolytic hydrogen production device, which is manufactured using the above-mentioned safety design method for the electrolytic hydrogen production device.

[0026] The safety design method of the electrolytic hydrogen production device of the present invention matches the volume of the cabinet with the volume of hydrogen, so that when hydrogen leaks into the cabinet instantaneously, the inherent volume of the cabinet itself can ensure that the concentration of hydrogen is within the lower explosion limit, effectively avoiding the risk of explosion and improving the safety of personnel and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the electrolytic hydrogen production device of the present application.

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the hydrogen production equipment of this application.

[0029] Figure 3 It is a schematic diagram of the process of the electrolytic hydrogen production device of the present application.

[0030] Figure 4 It is a schematic cross-sectional structural diagram of the cabinet of the present application in an expanded state. DETAILED DESCRIPTION

[0031] The following describes the implementation of the present application through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0032] In the following description, reference is made to the accompanying drawings, which illustrate several embodiments of the present application. It should be understood that other embodiments may be used, and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present application. The following detailed description should not be considered limiting, and the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present application.

[0033] Although the terms "first", "second", etc. are used herein to describe various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

[0034] Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprise", "include" indicate the presence of features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition occur only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0035] Figure 1 This is a schematic diagram of the three-dimensional structure of the electrolytic hydrogen production device of the present application. Figure 2 This is a schematic diagram of the three-dimensional structure of the hydrogen production equipment of this application. Figure 3 This is a schematic diagram of the process of the electrolytic hydrogen production device of this application, such as Figure 1 、 Figure 2 and Figure 3As shown, the present application relates to a safety design method for an electrolytic hydrogen production device. The safety design method for an electrolytic hydrogen production device is used to design and manufacture an electrolytic hydrogen production device 100. The electrolytic hydrogen production device 100 includes a cabinet 10 and a hydrogen production device 20 installed in the cabinet 10. The safety design method includes:

[0036] Calculate the sum of the effective volumes of the components containing hydrogen in the hydrogen production equipment 20 at the rated working pressure, and use the obtained volume as the volume V of hydrogen in the hydrogen production equipment 20 at the working pressure. H 1;

[0037] The volume of hydrogen at working pressure V H 1Converted to the volume of hydrogen at standard atmospheric pressure V H 2;

[0038] Hydrogen leaks into the cabinet 10. The concentration of hydrogen that does not explode is controlled to be less than 4%. The calculated safety volume V31 of the cabinet 10 is greater than or equal to the volume V of hydrogen at 24 times the standard atmospheric pressure. H 2.

[0039] The safety design method of the electrolytic hydrogen production device of the present application matches the volume of the cabinet 10 with the volume of hydrogen, so that when hydrogen leaks into the cabinet 10 instantaneously, relying on the inherent volume of the cabinet 10 itself, it can ensure that the concentration of hydrogen is within the lower explosion limit, which can effectively avoid the risk of explosion and improve the safety of personnel and equipment.

[0040] Optionally, the hydrogen-containing device in the hydrogen production equipment 20 includes a hydrogen-water separator 23, a droplet catcher 24 and a dryer 25 connected in series with the electrolyzer 22 via a pipeline 21, and the volume of hydrogen V H 1 is calculated by:

[0041] Calculate the volumes of the hydrogen-water separator 23, the drip trap 24, the dryer 25, and the hydrogen-containing pipeline 21;

[0042] The sum of the volumes of the hydrogen-water separator 23, the drip trap 24, the dryer 25, and the hydrogen-containing pipeline 21 is multiplied by a margin coefficient. The margin coefficient is greater than 1, for example, 1.05, 1.08, 1.1, or 1.15, but is not limited thereto. In this embodiment, the margin coefficient is determined by comprehensively considering the volume occupied by the hydrogen production equipment 20 in the cabinet 10. The value of this parameter can be selected based on the actual size of the hydrogen production equipment 20. Since the hydrogen in the electrolyzer 22 occupies a relatively small space, the volume of this portion of the hydrogen is included in the margin coefficient.

[0043] Optionally, when oxygen generated by the hydrogen production equipment 20 leaks into the cabinet 10, the safety design method includes:

[0044] Calculate the sum of the effective volumes of the components containing oxygen in the hydrogen production equipment 20 at the rated working pressure, and use the obtained volume as the volume V of oxygen in the hydrogen production equipment 20 at the working pressure. O 1;

[0045] The volume of oxygen at working pressure V O 1 converted to the volume of oxygen at standard atmospheric pressure V O 2;

[0046] The concentration of oxygen is controlled to be less than 23.5% so as not to produce an oxygen-rich environment. The calculated safety volume V32 of the cabinet 10 is greater than or equal to 31.6 times the volume of oxygen at standard atmospheric pressure V O 2;

[0047] Compare the volume V31 of cabinet 10 obtained from hydrogen leakage calculations with the volume V32 of cabinet 10 obtained from oxygen leakage calculations, and select the larger value as the safe volume of cabinet 10. It is worth noting that an oxygen content greater than 23.5% by volume constitutes an oxygen-rich environment. While oxygen itself is non-flammable, an oxygen-rich environment significantly increases the risk of fire and explosion. Fires are more likely to occur in an oxygen-rich environment, burning hotter and spreading faster. Even normally non-flammable materials can become highly flammable in an oxygen-rich environment.

[0048] The safety design method of the electrolytic hydrogen production device of the present application matches the volume of the cabinet 10 with the volume of oxygen, so that when oxygen leaks into the cabinet 10 instantaneously, the inherent volume of the cabinet 10 itself can ensure that the oxygen concentration is less than 23.5%, thereby avoiding the generation of an oxygen-rich environment.

[0049] Optionally, the oxygen-containing device in the hydrogen production equipment 20 includes an oxygen-water separator 26 connected to the electrolyzer 22 via a pipeline, and the volume of oxygen V O 1 is calculated by:

[0050] Calculate the volume V4 of the inner cavity of the oxygen-water separator 26, the volume V5 of the water in the oxygen-water separator 26, and the volume V O 1 is equal to the difference between volume V4 and volume V5.

[0051] Optionally, the cabinet 10 is provided with an exhaust fan 11 and an air inlet 101. The exhaust fan 11 is used to exhaust the air in the cabinet 10. The design method of the minimum air volume of the exhaust fan 11 includes:

[0052] Calculate the maximum hydrogen production of the electrolytic cell 22, and the minimum air volume of the exhaust fan 11 is greater than or equal to 24 times the maximum hydrogen production of the electrolytic cell 22;

[0053] Calculate the maximum oxygen production of the electrolytic cell 22, and the minimum air volume of the exhaust fan 11 is greater than or equal to 31.5 times the maximum oxygen production of the electrolytic cell 22;

[0054] The air volume of exhaust fan 11 obtained by calculating hydrogen leakage is compared with the air volume of exhaust fan 11 obtained by calculating oxygen leakage, and the larger value is selected as the minimum air volume of exhaust fan 11. In this embodiment, the air volume of exhaust fan 11 can ensure that the hydrogen concentration in cabinet 10 does not exceed the lower explosion limit and can effectively avoid the formation of an oxygen-rich environment.

[0055] Optionally, the electrolytic hydrogen production device 100 further includes a circulation fan 30, which is installed in the cabinet 10 and is used to maintain air flow in the cabinet 10. In this embodiment, the circulation fan 30 can evenly mix the gas in the cabinet 10 and prevent hydrogen from gathering in a local area of the cabinet 10.

[0056] The invention of this application is further described below with reference to specific embodiments.

[0057] Design a 10Nm 3 / h hydrogen production equipment 20.

[0058] During normal operation, the generated hydrogen is sealed inside the hydrogen-water separator 23, the dryer 25, the droplet catcher 24, the hydrogen-containing pipeline 21 and other equipment.

[0059] 1. Calculation of instantaneous hydrogen leakage

[0060] (1) Volume of hydrogen-water separator 23:

[0061] The hydrogen-water separator 23 has an inner diameter of 76 mm, a height of 219 mm, and a volume of 0.99 L.

[0062] (2) Volume of dryer 25:

[0063] The dryer 25 has an inner diameter of 70 mm, a height of 950 mm, and a capacity of 3.65 L. Excluding the space occupied by the desiccant, and assuming that each tower can hold a maximum of 1.8 L of hydrogen, the two towers can hold a total of 3.6 L.

[0064] (3) Volume of dripper 24:

[0065] The dropper 24 has an inner diameter of 20 mm, a height of 600 mm, and a volume of 0.2 L.

[0066] (4) Volume of hydrogen-containing pipeline 21:

[0067] The hydrogen-containing pipe 21 has an inner diameter of 8 mm, a length of 10 m, and a volume of 0.5 L.

[0068] (5) Total hydrogen volume at 3 MPa:

[0069] 0.99+3.6+0.2+0.5=5.29L, taking the remainder coefficient as 1.1, the total volume of hydrogen at 3MPa (gauge pressure) is 5.8L, that is, the total volume of hydrogen at working pressure V H 1=5.8L.

[0070] (6) Volume of total instantaneous leakage (from 3 MPa to standard atmospheric pressure, 1 standard atmospheric pressure is 0.1 MPa):

[0071] (3+0.1)×5.8 / 0.1=180L, which is the volume of hydrogen at standard atmospheric pressure V H 2=180L.

[0072] (7) Minimum safe volume of cabinet 10:

[0073] 180×24=4320L. Check the size of the designed cabinet 10. If the volume of the cabinet 10 is greater than 4320L, the check passes. If the volume of the cabinet 10 is less than 4320L, the size of the cabinet 10 needs to be increased. The designed cabinet 10 is 2.2m long, 1m wide, and 2.2m high. The calculated volume is 4.84m. 3 , that is, 48400L>4320L, the verification passed.

[0074] 2. Instantaneous oxygen leakage calculation

[0075] Oxygen-water separator 26 has an inner diameter of 300 mm, a length of 500 mm, and a capacity of 35 L. Half of this volume is water, with oxygen occupying at most half the volume, or 17.5 L. The pressure inside oxygen-water separator 26 is 2 bar (gauge pressure). The total volume of gas that leaks instantly (from 2 bar to standard atmospheric pressure, where 1 standard atmospheric pressure is 1 bar) is: (2 + 1) × 17.5 / 1 = 52.5 L.

[0076] The minimum safe volume of the cabinet 10 is 52.5×31.6=1659 L, which is much smaller than the value of 4320 L calculated based on hydrogen leakage. Therefore, the safety requirements for both hydrogen leakage and oxygen leakage can be met by calculating based on hydrogen leakage.

[0077] 3. Calculation of air volume of exhaust fan 11

[0078] The hydrogen production is 10Nm 3 / h, that is, if hydrogen continues to leak, the maximum leakage is 10Nm 3 / h, the minimum air volume of the exhaust fan 11 is:

[0079] 10×24=240Nm 3 / h.

[0080] The oxygen production is 5Nm 3 / h, that is, if oxygen continues to leak, the maximum leakage is 5Nm 3 / h, the minimum air volume of the exhaust fan 11 is:

[0081] 5×31.6=158Nm 3 / h.

[0082] 240Nm 3 / h>158Nm 3 / h, the air volume of exhaust fan 11 is greater than 240Nm 3 / h.

[0083] Optionally, when no hydrogen leakage and / or oxygen leakage occurs in the hydrogen production equipment 20, in order to prevent the cabinet 10 from taking up too much space, the present application designs the cabinet 10 to be an expandable and retractable structure. On the premise of ensuring that the hydrogen production equipment 20 can be fully accommodated, the original volume of the cabinet 10 can be designed to be smaller than the safe volume when oxygen leaks. At this time, the overall volume of the cabinet 10 is small, does not take up too much space, and is convenient for transportation and installation. The specific implementation method is as follows.

[0084] Optionally, Figure 4 This is a schematic cross-sectional view of the cabinet in the expanded state of the present application. Figure 4 As shown, the cabinet 10 includes a frame (not shown), two cabinet doors 12, multiple outer shell panels 13, at least one telescopic flexible member 14, and a drive mechanism 15. The two cabinet doors 12 are switchably connected to the front side of the frame, and the multiple outer shell panels 13 are connected to the frame in an area away from the cabinet doors 12. The telescopic flexible member 14 is connected between at least one outer shell panel 13 and the frame, and the telescopic flexible member 14 is arranged around the periphery of the outer shell panel 13. The drive mechanism 15 is used to drive the outer shell panel 13 connected to the telescopic flexible member 14 to move telescopically to change the volume of the cabinet 10. In this embodiment, the drive mechanism 15 includes, for example, a motor, a screw rod, and other structures to drive the outer shell panel 13 to move.

[0085] Optionally, the cabinet body 10 includes five outer shell plates 13, wherein one outer shell plate 13 is connected to the top of the frame, one outer shell plate 13 is connected to the bottom of the frame, serving as a bottom plate for supporting part of the hydrogen production equipment 20, and the other two outer shell plates 13 are connected to the left and right sides of the frame, and the last outer shell plate 13 is connected to the rear side of the frame, that is, the outer shell plate 13 is parallel to and opposite to the two closed cabinet doors 12.

[0086] like Figure 4 As shown, the rear shell plate 13 of the frame is connected to the telescopic flexible member 14 and can move in a direction away from or close to the frame under the drive of the driving mechanism 15 .

[0087] In one embodiment, the outer shell plates 13 on the left and right sides of the frame are both connected with telescopic flexible members 14 .

[0088] Optionally, the body of the telescopic flexible member 14 includes a plurality of pleated structures connected in sequence, and the plurality of pleated structures can be compressed together or stretched. In this embodiment, the telescopic flexible member 14 is annular as a whole, and its shape matches the shape of the outer shell plate 13.

[0089] Optionally, the electrolysis hydrogen production device 100 further includes a controller (not shown) and a first sensor (not shown), the controller being electrically connected to the first sensor and the driving mechanism 15, respectively, and the first sensor being used to detect whether hydrogen leakage occurs in the hydrogen production equipment 20;

[0090] When the first sensor detects that hydrogen leakage occurs in the hydrogen production equipment 20 , the controller controls the driving mechanism 15 to drive the outer shell plate 13 to move, so that the volume of the cabinet 10 increases to the safety volume V31 .

[0091] Optionally, the electrolysis hydrogen production device 100 further includes a second sensor, the controller is electrically connected to the second sensor, and the second sensor is used to detect whether oxygen leakage occurs in the hydrogen production equipment 20;

[0092] When the second sensor detects that the hydrogen production equipment 20 has oxygen leakage, the controller controls the driving mechanism 15 to drive the outer shell plate 13 to move, so that the volume of the cabinet 10 increases to the safety volume V32;

[0093] When the first sensor detects hydrogen leakage in the hydrogen production equipment 20 and the second sensor detects oxygen leakage in the hydrogen production equipment 20 , the controller controls the driving mechanism 15 to move the outer shell plate 13 to increase the volume of the cabinet 10 to the safety volume V31 .

[0094] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A safety design method for an electrolytic hydrogen production device, characterized in that: The electrolytic hydrogen production device includes a cabinet and hydrogen production equipment installed in the cabinet; the safety design method includes: Calculate the sum of the effective volumes of the components containing hydrogen in the hydrogen production equipment at the rated working pressure, and use the obtained volume as the volume V of the hydrogen in the hydrogen production equipment at the working pressure. H 1; The volume V of the hydrogen at the working pressure H 1Converted to the volume of hydrogen at standard atmospheric pressure V H 2; The hydrogen leaks into the cabinet, and the concentration of the hydrogen is controlled to be less than 4% to prevent explosion. The calculated safety volume V31 of the cabinet is greater than or equal to 24 times the volume V of the hydrogen under the standard atmospheric pressure. H 2.

2. The safety design method for the electrolytic hydrogen production device according to claim 1, characterized in that: The hydrogen-containing device in the hydrogen production equipment includes a hydrogen-water separator, a drip collector and a dryer connected in series with the electrolyzer through a pipeline. The volume of the hydrogen is V H 1 is calculated by: Calculating the volumes of the hydrogen-water separator, the drip trap, the dryer, and the pipeline containing hydrogen; The volumes of the hydrogen-water separator, the drip collector, the dryer, and the hydrogen-containing pipeline are summed and multiplied by a surplus coefficient, where the surplus coefficient is greater than 1.

3. The safety design method for the electrolytic hydrogen production device according to claim 2, characterized in that: When the oxygen generated by the hydrogen production equipment leaks into the cabinet, the safety design method includes: Calculate the sum of the effective volumes of the components containing oxygen in the hydrogen production equipment at the rated working pressure, and use the obtained volume as the volume V of the oxygen in the hydrogen production equipment at the working pressure. O 1; The volume V of the oxygen at the working pressure O 1 converted to the volume of oxygen at standard atmospheric pressure V O 2; The concentration of oxygen is controlled to be less than 23.5% so as not to produce an oxygen-rich environment. The calculated safety volume V32 of the cabinet is greater than or equal to 31.6 times the volume V of oxygen under the standard atmospheric pressure. O 2; Compare the volume V31 of the cabinet obtained by the hydrogen leakage calculation with the volume V32 of the cabinet obtained by the oxygen leakage calculation, and select the larger value as the safe volume of the cabinet.

4. The safety design method for the electrolytic hydrogen production device according to claim 3, characterized in that: The device containing oxygen in the hydrogen production equipment includes an oxygen-water separator connected to the electrolyzer through a pipeline, and the volume of the oxygen V O 1 is calculated by: Calculate the volume V4 of the inner cavity of the oxygen-water separator and the volume V5 of the water in the oxygen-water separator, the volume V O 1 is equal to the difference between the volume V4 and the volume V5.

5. The safety design method for the electrolytic hydrogen production device according to claim 3, characterized in that: The cabinet is provided with an exhaust fan and an air inlet, and the exhaust fan is used to exhaust the air in the cabinet. The design method of the minimum air volume of the exhaust fan includes: Calculating the maximum hydrogen production of the electrolyzer, the minimum air volume of the exhaust fan is greater than or equal to 24 times the maximum hydrogen production of the electrolyzer; Calculating the maximum oxygen production of the electrolytic cell, the minimum air volume of the exhaust fan is greater than or equal to 31.5 times the maximum oxygen production of the electrolytic cell; The air volume of the exhaust fan obtained by the hydrogen leakage calculation is compared with the air volume of the exhaust fan obtained by the oxygen leakage calculation, and the larger value is selected as the minimum air volume of the exhaust fan.

6. The safety design method for the electrolytic hydrogen production device according to claim 3, characterized in that: The cabinet body includes a frame, two cabinet doors, multiple outer shell panels, at least one telescopic flexible member and a driving mechanism. The two cabinet doors are connected to the front side of the frame in a switchable manner. Multiple outer shell panels are connected to the area of the frame avoiding the cabinet doors. The telescopic flexible member is connected between at least one outer shell panel and the frame. The telescopic flexible member is arranged around the periphery of the outer shell panel. The driving mechanism is used to drive the outer shell panel connected with the telescopic flexible member to telescopically move to change the volume of the cabinet body.

7. The safety design method for the electrolytic hydrogen production device according to claim 6, characterized in that: The electrolytic hydrogen production device further includes a controller and a first sensor, wherein the controller is electrically connected to the first sensor and the driving mechanism respectively, and the first sensor is used to detect whether hydrogen leakage occurs in the hydrogen production equipment; When the first sensor detects that hydrogen leakage occurs in the hydrogen production equipment, the controller controls the driving mechanism to drive the outer shell plate to move, so that the volume of the cabinet increases to the safety volume V31.

8. The safety design method for the electrolytic hydrogen production device according to claim 6, characterized in that: The electrolytic hydrogen production device further includes a second sensor, the controller is electrically connected to the second sensor, and the second sensor is used to detect whether oxygen leakage occurs in the hydrogen production equipment; When the second sensor detects that oxygen leakage occurs in the hydrogen production equipment, the controller controls the driving mechanism to drive the outer shell plate to move, so that the volume of the cabinet increases to the safety volume V32.

9. The safety design method for an electrolytic hydrogen production device according to any one of claims 1 to 8, characterized in that: The electrolytic hydrogen production device further includes a circulation fan installed in the cabinet, and the circulation fan is used to maintain air flow in the cabinet.

10. An electrolytic hydrogen production device, characterized in that: The electrolytic hydrogen production device is manufactured using the safety design method for an electrolytic hydrogen production device according to any one of claims 1 to 9.

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