Water electrolysis control device and water electrolysis hydrogen production system

Abstract

The utility model discloses an electrolyzed water control device and an electrolyzed water hydrogen production system, and relates to the technical field of hydrogen production, the electrolyzed water control device comprises a gas-liquid separation device, a plurality of electrolytic baths and a plurality of control valves, the gas-liquid separation device is provided with a gas inlet part; each electrolytic cell is provided with an air outlet pipe, and the air outlet pipes of the multiple electrolytic cells are connected into the air inlet part and communicate with one another through the air inlet part; the plurality of control valves are arranged on the gas outlet pipes of the plurality of electrolytic cells in a one-to-one manner; and the control valves are used for controlling the connection / disconnection between the corresponding electrolytic cells and the gas-liquid separation devices. Therefore, the situation that gas conveyed to the gas-liquid separation device from the electrolytic cell which is started firstly flows into the electrolytic cell which is not opened or just opened, so that an exchange membrane of the electrolytic cell which is not opened or just opened is damaged, and even the safety problem occurs due to the fact that the concentration of the flowing-in gas is too high and exceeds the safety load range of the electrolytic cell is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production, in particular to a water electrolysis control device and a water electrolysis hydrogen production system. Background Art

[0002] At present, with the increasing demand for hydrogen production, the scale of water electrolysis hydrogen production equipment is gradually increasing. In such large-scale projects, it is generally necessary to connect multiple electrolyzers to the gas-liquid separation device. However, because the gas outlets of the electrolyzers are interconnected, when it is necessary to open different electrolyzers one after another, the gas outlets of some of the electrolyzers that have been opened will flow into the electrolyzers that have not been opened or opened later. The gas that flows in from other electrolyzers will damage the exchange membrane of the electrolyzers that have not been opened or have just been opened, causing safety problems for the electrolyzers. Utility Model Content

[0003] The main purpose of the utility model is to provide a water electrolysis control device and a water electrolysis hydrogen production system, aiming to solve the technical problem of gas blowby occurring when the electrolyzer is working.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a water electrolysis control device, comprising:

[0005] The gas-liquid separation device is provided with an air inlet portion;

[0006] A plurality of electrolytic cells, each of which is provided with an air outlet pipe, the air outlet pipes of the plurality of electrolytic cells are respectively connected to the air inlet part and are interconnected through the air inlet part;

[0007] A plurality of control valves are arranged one-to-one on the gas outlet pipes of the plurality of electrolytic cells, and the control valves are used to control the on / off connection between the corresponding electrolytic cells and the gas-liquid separation device.

[0008] In one embodiment, the plurality of control valves are any one or a combination of switch valves and check valves.

[0009] In one embodiment, when the control valve is a switch valve, the electrolysis water control device also includes a plurality of pressure detection devices, each of which has a first detection end and a second detection end, the first detection end is connected to the air inlet part, and is used to detect the gas pressure in the air inlet part; the second detection end is connected to the outlet pipe of the corresponding electrolytic cell, and is used to detect the gas pressure in the outlet pipe.

[0010] In one embodiment, the water electrolysis control device also includes a control component, which is electrically connected to multiple pressure detection devices and multiple switch valves, respectively, and is used to control the switch valve to control the connection between the electrolytic cell and the gas-liquid separation device based on the gas pressure in the outlet pipe detected by the pressure detection device.

[0011] In one embodiment, when the control valve is a check valve, the check valve is triggered when the pressure difference between the gas pressure in the air inlet and the gas pressure in the air outlet pipe reaches a preset pressure difference threshold, and the connection between the electrolytic cell and the gas-liquid separation device is connected.

[0012] In one embodiment, the electrolyzed water control device further includes a plurality of pressure detection devices, each of which is disposed on the gas outlet pipe of the electrolytic cell and is disposed close to the electrolytic cell for detecting the gas pressure in the gas outlet pipe of the electrolytic cell.

[0013] In one embodiment, the water electrolysis control device also includes a control component, which is electrically connected to the multiple electrolytic cells and multiple pressure detection devices, respectively, and is used to control the corresponding electrolytic cell to stop working when the gas pressure in the outlet pipe is greater than a preset pressure threshold.

[0014] In one embodiment, each of the electrolytic cells is provided with a liquid inlet pipe, and the gas-liquid separation device is further provided with a recovery liquid outlet, and the recovery liquid outlet is respectively connected to the liquid inlet pipes of the plurality of electrolytic cells.

[0015] In one embodiment, the gas outlet pipe includes a hydrogen gas outlet pipe and an oxygen gas outlet pipe which are independently arranged, and the gas inlet portion includes a first gas inlet portion and a second gas inlet portion, and the hydrogen gas outlet pipes of the plurality of electrolyzers are respectively connected to the first gas inlet portion and are interconnected through the first gas inlet portion; the oxygen gas outlet pipes of the plurality of electrolyzers are respectively connected to the second gas inlet portion and are interconnected through the second gas inlet portion.

[0016] The utility model also provides a water electrolysis hydrogen production system, which includes the water electrolysis control device as described above.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The gas produced by the electrolytic cell is mixed with liquid, and the gas outlet pipes of the multiple electrolytic cells of the electrolytic water control device are respectively connected to the gas inlet of the gas-liquid separation device, and are interconnected through the gas inlet to transmit the discharged hydrogen and oxygen to the gas-liquid separation device, and the gas and liquid are separated by the gas-liquid separation device to improve the gas purity;

[0019] Connecting the gas outlet pipes of multiple electrolyzers to the gas inlet of the gas-liquid separation device respectively can reduce the use of the gas-liquid separation device, further reduce the space occupied by the water electrolysis hydrogen production system, and improve the control efficiency of the water electrolysis control device;

[0020] A plurality of control valves are arranged one-to-one on the gas outlet pipes of a plurality of electrolytic cells, and the control valves are used to control the connection between the corresponding electrolytic cells and the gas-liquid separation device to be turned on / off, so as to prevent the gas transmitted from the previously opened electrolytic cell to the gas-liquid separation device from entering the electrolytic cell that has not yet been opened or has just been opened, causing damage to the exchange membrane of the electrolytic cell that has not yet been opened or has just been opened, and even causing safety problems due to excessive concentration of the gas entering and exceeding the safe load range of the electrolytic cell;

[0021] By arranging a control valve on the gas outlet pipe of each electrolytic cell, it is suitable to realize continuous opening of the gas outlet pipes of different electrolytic cells by connecting the control valve, or to keep the gas outlet pipe of the electrolytic cell closed by closing the control valve, or to realize continuous closing of the gas outlet pipes of different electrolytic cells. After opening any electrolytic cell, by opening the corresponding control valve and controlling the corresponding control valves of other unopened electrolytic cells to remain closed, it is possible to prevent the gas generated by the working electrolytic cell from leaking into the unopened electrolytic cell, thereby effectively improving the reliability and safety of the control and reducing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of functional modules of an embodiment of a water electrolysis control device provided by the utility model;

[0024] Figure 2 A schematic structural diagram of an embodiment of a water electrolysis control device provided by the utility model;

[0025] Figure 3 This is a schematic structural diagram of another embodiment of the water electrolysis control device provided by the utility model.

[0026] Description of Figure Numbers:

[0027] 1011, first air inlet; 1012, second air inlet; 1021, hydrogen side liquid outlet; 1022, oxygen side liquid outlet; 110, hydrogen side gas-liquid separation device; 120, oxygen side gas-liquid separation device;

[0028] 200, electrolyzer; 211, hydrogen outlet pipe; 212, oxygen outlet pipe; 221, hydrogen side liquid inlet pipe; 222, oxygen side liquid inlet pipe;

[0029] 300, control valve; 310, switch valve; 320, check valve;

[0030] 400, pressure detection device; 410, first pressure detection device; 420, second pressure detection device;

[0031] 500. Control components.

[0032] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0036] At present, with the increasing demand for hydrogen production, the scale of water electrolysis hydrogen production equipment is gradually increasing. In such large-scale projects, it is generally necessary to connect multiple electrolyzers to the gas-liquid separation device, but because the gas outlets of the electrolyzers are interconnected, safety issues arise when different electrolyzers need to be opened one after another.

[0037] Taking the example of a water electrolysis hydrogen production system with four electrolyzers, if the gas outlet pipes of the four electrolyzers are connected in parallel and connected to the gas inlet of the gas-liquid separation device through a bus or other connecting lines, when two of the electrolyzers are operated in advance, the gas produced by the electrolyzers that have been operated in advance will enter the other two electrolyzers in a closed state along the main pipe or other connecting lines, causing the oxygen, hydrogen and other gases produced by the two electrolyzers that were opened in advance to penetrate into the unopened or later-opened electrolyzers, destroying the exchange membrane of the unopened or just-opened electrolyzers. In this way, after the electrolyzers are opened continuously, the concentration of oxygen in the hydrogen or hydrogen in the oxygen in the electrolyzers when they are just started will be in danger of exceeding the standard, posing a safety hazard.

[0038] In order to solve the problem of gas blowby when the electrolyzer is working and prevent the gas generated by the running electrolyzer from blowing into the unopened or just opened electrolyzer to cause safety problems, the utility model provides an electrolysis water control device and an electrolysis water hydrogen production system, which controls the connection between the corresponding electrolyzer and the gas-liquid separation device by setting a control valve, and further controls the connection of the pipeline according to the pressure difference of the gas outlet pipe, so as to effectively solve the safety problems caused by gas blowby.

[0039] Reference Figures 1 to 3 The water electrolysis control device provided by the utility model includes a gas-liquid separation device, a plurality of electrolytic cells 200 and a plurality of control valves 300 .

[0040] The gas-liquid separation device is provided with an air inlet, which can be specifically configured as an air inlet main pipe. Each electrolytic cell 200 is provided with an air outlet pipe, and the air outlet pipes of multiple electrolytic cells 200 are respectively connected to the air inlet and are interconnected through the air inlet.

[0041] Since the gas produced by the electrolyzer 200 is mixed with liquid, the gas outlet pipes of the multiple electrolyzers 200 of the electrolytic water control device are respectively connected to the gas inlet of the gas-liquid separation device, and are interconnected through the gas inlet, which can be used to transmit the discharged hydrogen and oxygen to the gas-liquid separation device, and separate the gas and liquid through the gas-liquid separation device to improve the gas purity. In this way, the use of the gas-liquid separation device can be reduced, and the space occupied by the electrolytic water hydrogen production system can be further reduced, and the control efficiency of the electrolytic water control device can be improved.

[0042] The control valve 300 is configured to be closed when the pressure on the side close to the electrolytic cell 200 is less than the pressure on the side close to the gas-liquid separator, so as to cut off the connection between the gas outlet pipe of the corresponding electrolytic cell and the gas-liquid separation device; and to be opened when the pressure on the side close to the electrolytic cell 200 is not less than the pressure on the side close to the gas-liquid separator, so as to connect the connection between the gas outlet pipe of the corresponding electrolytic cell 200 and the gas-liquid separation device. A plurality of control valves 300 are arranged one-to-one on the gas outlet pipes of a plurality of electrolytic cells 200, and the control valves 300 are used to control the connection on / off between the corresponding electrolytic cell 200 and the gas-liquid separation device. In this way, it is possible to prevent the gas transmitted from the previously opened electrolytic cell 200 to the gas-liquid separation device from entering the electrolytic cell 200 that has not yet been opened or has just been opened, resulting in damage to the exchange membrane of the electrolytic cell 200 that has not yet been opened or has just been opened, and even safety problems may occur due to excessive concentration of the gas entering and exceeding the safe load range of the electrolytic cell 200.

[0043] By arranging a control valve 300 on the gas outlet pipe of each electrolytic cell 200, it is suitable to realize continuous opening of the gas outlet pipes of different electrolytic cells 200 by connecting the control valve 300, or to keep the gas outlet pipe of the electrolytic cell 200 closed by closing the control valve 300, or to realize continuous closing of the gas outlet pipes of different electrolytic cells 200. After opening any electrolytic cell 200, by opening the corresponding control valve 300 and controlling the corresponding control valves 300 of other unopened electrolytic cells 200 to remain closed, it is possible to prevent the gas generated by the working electrolytic cell 200 from leaking into the unopened electrolytic cell 200, thereby effectively improving the reliability and safety of the control and reducing safety hazards.

[0044] In the utility model, at least one bus or other interconnecting line (or chamber) may be optionally provided on the gas-liquid separation device, and the gas outlet pipe of each electrolytic cell 200 is connected to the bus or other interconnecting line (or chamber), and at least one bus or other interconnecting line (or chamber) is used as the gas inlet of the gas-liquid separation device to mix the gases transmitted by different electrolytic cells 200 and transmit the gases generated by multiple electrolytic cells 200 to the gas-liquid separation device; or, the gas inlet of the gas-liquid separation device is used as the gas inlet to centrally send the gases generated by different electrolytic cells 200 into the gas-liquid separation device through the gas inlet.

[0045] The gas-liquid separation device is used to separate gases such as oxygen and hydrogen and liquids such as alkali solution in the gas transmitted by the electrolytic cell 200. In order to achieve environmental protection, in one embodiment, each electrolytic cell 200 is provided with a liquid inlet pipe, and the gas-liquid separation device is also provided with a liquid recovery outlet, which is respectively connected to the liquid inlet pipes of multiple electrolytic cells 200.

[0046] Specifically, the gas-liquid separation device includes a hydrogen-side gas-liquid separation device 110 and an oxygen-side gas-liquid separation device 120, and the recovered liquid outlet includes a hydrogen-side liquid outlet 1021 and an oxygen-side liquid outlet 1022. The hydrogen-side liquid outlet 1021 is provided in the hydrogen-side gas-liquid separation device 110, and the oxygen-side liquid outlet 1022 is provided in the oxygen-side gas-liquid separation device 120. The liquid inlet pipe of each electrolyzer includes a hydrogen-side liquid inlet pipe 221 and an oxygen-side liquid inlet pipe 222. The hydrogen-side liquid outlet 1021 is respectively connected to the hydrogen-side liquid inlet pipes 221 of the plurality of electrolyzers, and the oxygen-side liquid outlet 1022 is respectively connected to the oxygen-side liquid inlet pipes 222 of the plurality of electrolyzers.

[0047] In this way, the separated alkali solution and other liquids can be transmitted to the electrolytic cell 200 through the liquid inlet pipe of the electrolytic cell 200, and the recovered liquid outlet can be specifically configured as a liquid outlet main pipe to realize the reuse of recovered liquids such as alkali solution, improve the utilization rate of alkali solution, and reduce production and processing costs.

[0048] To improve gas purity, in one embodiment, the gas outlet pipe includes a hydrogen gas outlet pipe 211 and an oxygen gas outlet pipe 212 that are independently arranged, and the gas inlet portion includes a first gas inlet portion 1011 and a second gas inlet portion 1012. The hydrogen gas outlet pipes 211 of the plurality of electrolytic cells 200 are respectively connected to the first gas inlet portion 1011, and are interconnected through the first gas inlet portion 1011; the oxygen gas outlet pipes 212 of the plurality of electrolytic cells 200 are respectively connected to the second gas inlet portion 1012, and are interconnected through the second gas inlet portion 1012.

[0049] Specifically, the gas-liquid separation device includes a hydrogen-side gas-liquid separation device 110 and an oxygen-side gas-liquid separation device 120. The first gas inlet 1011 is arranged on the hydrogen-side gas-liquid separation device 110, and the second gas inlet 1012 is arranged on the oxygen-side gas-liquid separation device 120. The first gas inlet 1011 is connected to the hydrogen outlet pipe 211 of the multiple electrolytic cells 200 to receive the hydrogen transmitted by the multiple electrolytic cells 200; the second gas inlet 1012 is connected to the oxygen outlet pipe 212 of the multiple electrolytic cells 200 to receive the oxygen transmitted by the multiple electrolytic cells 200 to avoid hydrogen and oxygen mixing, affecting the gas purity, and even affecting the subsequent processes.

[0050] In the present invention, the electrolysis water control device has a manual control function and / or an automatic control function. To realize the manual control function, the staff can optionally control the connection or disconnection of the corresponding control valve 300 to realize the connection / disconnection between the gas-liquid separation device and the corresponding electrolytic cell 200 gas outlet pipe. In order to realize the automatic control function, the connection or disconnection of the control valve 300 can be optionally controlled by the remote control component 500 and other control components 500 that can comprehensively control the operation of each control valve 300, so as to further realize the connection / disconnection between the gas-liquid separation device and the corresponding electrolytic cell 200 outlet pipe; or a control component 500 is respectively set for each outlet pipe, and the control component 500 controls the connection or disconnection of the corresponding control valve 300 by itself, so as to further realize the connection / disconnection between the gas-liquid separation device and the corresponding electrolytic cell 200 outlet pipe; or a check valve 320 or other control valve 300 that can automatically realize connection and disconnection is respectively set for each outlet pipe, and the control valve 300 is automatically connected or closed according to the pressure in the pipe, so as to further realize the connection / disconnection between the gas-liquid separation device and the corresponding electrolytic cell 200 outlet pipe.

[0051] The control component 500 shown can be, but is not limited to, an MCU (Micro Control Unit), a single-chip microcomputer or other controller, or other control devices that can obtain the detection signal transmitted by the above-mentioned pressure detection device 400, and control the switch valve 310, the check valve 320 and other control valves 300 to be turned on or off; it includes a circuit with a control device that can realize the above-mentioned functions; the specific settings can be based on actual conditions and are not limited here.

[0052] Optionally, according to actual needs, all control valves 300 can be set to remain in a closed state at all times, and only be connected when it is necessary to connect the connection between the corresponding electrolytic cell 200 and the gas-liquid separation device; or, the control valves 300 of some electrolytic cells 200 that need to be connected to the gas separation device can be set to remain in an connected state, and the control valves 300 of other electrolytic cells 200 that do not need to be connected to the gas separation device can be controlled to remain in a closed state, until the corresponding control valve 300 is connected when it is necessary to connect the connection between the electrolytic cell 200 and the gas-liquid separation device.

[0053] Since the gas outlet pipe of the electrolytic cell 200 that has been turned on and operated is connected to the gas inlet part of the gas-liquid separation device, the gas pressure in the gas outlet pipe of the electrolytic cell 200 that is connected to the gas-liquid separation device is the same as the gas pressure in the gas inlet part. Specifically, this part can be regarded as an air circuit system, and it is necessary to compare the gas pressure in the gas outlet pipe of the electrolytic cell 200 that has just been turned on with the pressure difference of this part of the air circuit system. Only when the gas pressure in the gas outlet pipe of the electrolytic cell 200 is not less than the gas pressure of this part of the air circuit system, or only when the gas pressure in the gas outlet pipe of the electrolytic cell 200 and the pressure difference of this part of the air circuit system reach a preset pressure difference threshold (that is, the gas pressure in the gas outlet pipe of the electrolytic cell 200 is close to the gas pressure of this part of the air circuit system), can the gas of this part of the air circuit system be prevented from flowing back into the electrolytic cell 200 through the gas outlet pipe of the electrolytic cell 200, thereby causing a safety hazard. Specifically, the control valve 300 is used to control the connection or closing of the gas outlet pipe to maintain the closure of the gas outlet pipe of the unopened electrolytic cell 200 and maintain the closure of the gas outlet pipe of the just-opened electrolytic cell 200, until the gas production of the opened electrolytic cell 200 makes the pressure difference in the gas outlet pipe and the gas path system formed by the gas outlet pipes of other opened and running electrolytic cells 200 reach the requirement and can effectively prevent the gas from flowing back into the just-opened electrolytic cell 200, then the gas outlet pipe of the just-opened electrolytic cell 200 will be connected.

[0054] Optionally, the control valve 300 may be, but is not limited to, a switch valve 310, a check valve 320, or any other switch control assembly suitable for actual use. The switch valve 310 is used to control the connection between the corresponding electrolyzer 200 and the gas-liquid separation device by turning on or off the switch valve 310 when realizing the manual control function or the automatic control function, so as to facilitate the realization of the control function. The check valve 320 is used to allow oxygen, hydrogen and other media to flow in one direction to avoid reverse flow. The check valve 320 can be used to automatically control the connection between the corresponding electrolyzer 200 and the gas-liquid separation device according to the pressure difference between the gas pressure in the air inlet and the gas pressure in the air outlet pipe, so as to reduce the control process. Specifically, the switch valve 310, the check valve 320, or any other switch control assembly suitable for actual use can be set on the air outlet pipe as needed, which is not limited here.

[0055] To avoid accidents, in one embodiment, the plurality of control valves 300 are any one or a combination of switch valves 310 and check valves 320 .

[0056] It can be understood that in the present invention, a switch valve 310 may be optionally provided on all the outlet pipes, or a check valve 320 may be provided on all the outlet pipes, or a switch valve 310 may be provided on some of the outlet pipes and a check valve 320 may be provided on other outlet pipes, or either a switch valve 310 or a check valve 320 may be provided on some of the outlet pipes and other control valves 300 may be provided on other outlet pipes; this is not limited here.

[0057] Further, in the utility model, the electrolysis water control device also includes a plurality of pressure detection devices 400. Specifically, the pressure detection device 400 is arranged on the air outlet pipe of the electrolytic cell 200. Specifically, the pressure detection device 400 and the control valve 300 can be arranged in parallel between the air outlet pipe of the electrolytic cell 200 and the air inlet of the gas-liquid separation device; or, the pressure detection device 400 and the control valve 300 can be arranged in series between the air outlet pipe of the electrolytic cell 200 and the air inlet of the gas-liquid separation device, and the pressure detector is arranged close to the electrolytic cell 200, or the pressure detector is arranged close to the air inlet; specifically, the pressure detection device 400 and the control valve 300 can be arranged according to the actual connection between the air outlet pipe of the electrolytic cell 200 and the air inlet of the gas-liquid separation device, which is not specifically limited here.

[0058] By setting the pressure detection device 400, the connection between the corresponding electrolyzer 200 and the gas-liquid separation device can be further controlled based on the pressure difference between the gas pressure in the air inlet and the gas pressure in the air outlet pipe, so as to avoid the gas pressure in the air outlet pipe of the electrolyzer 200 being too low, resulting in the pressure difference between the gas pressure in the air outlet pipe and the gas pressure in the air inlet failing to meet the requirement and causing gas blowby; it can also avoid the gas pressure in the air outlet pipe of the electrolyzer 200 being too high, resulting in the pressure difference between the gas pressure in the air outlet pipe and the gas pressure in the air inlet exceeding the preset pressure difference threshold or other control standards, resulting in overpressure, which affects the control of the control valve 300 and the process of hydrogen production by electrolysis of water.

[0059] In order to distinguish the pressure detection device 400 used when the control valve 300 adopts the switch valve 310 and the pressure detection device 400 used when the control valve 300 adopts the check valve 320, the following example uses the pressure detection device 400 used when the control valve 300 adopts the switch valve 310 as the first pressure detection device 410, and uses the pressure detection device 400 used when the control valve 300 adopts the check valve 320 as the second pressure detection device 420 for explanation.

[0060] Reference Figure 2 As an example of an embodiment of the present utility model, when the control valve 300 is a switch valve 310:

[0061] In this example, each first pressure detection device 410 has a first detection end and a second detection end. The first detection end is connected to the air inlet and is used to detect the gas pressure in the air inlet; the second detection end is connected to the outlet pipe of the corresponding electrolytic cell 200 and is used to detect the gas pressure in the outlet pipe.

[0062] Optionally, the first pressure detection device 410 shown uses a differential pressure gauge or other pressure detection devices that can automatically detect the pressure difference, and the first pressure detection device 410 such as the differential pressure gauge automatically calculates the pressure difference between the gas pressure in the air inlet part and the gas pressure in the air outlet pipe according to the detection conditions of the first detection end and the second detection end; or, the first pressure detection device 410 includes two pressure gauges or other pressure detection devices respectively arranged corresponding to the gas-liquid separation device and the electrolytic cell 200, and the detection end of one of the pressure gauges is used as the first detection end, and the detection end of the other pressure gauge is used as the second detection end, so as to obtain the pressure difference between the gas pressure in the air inlet part and the gas pressure in the air outlet pipe by manual calculation or automatic calculation according to the detection conditions of the first detection end and the second detection end.

[0063] The water electrolysis control device also includes a control component 500. Taking the automatic control function of the water electrolysis control device realized by the remote control component 500 and other control components 500 that can comprehensively control the operation of each control valve 300 as an example, when the control valve 300 is a switch valve 310, in one embodiment, the control component 500 is electrically connected to multiple pressure detection devices 400 and multiple switch valves 310 respectively, and is used to control the switch valve 310 to control the connection between the electrolytic cell 200 and the gas-liquid separation device according to the gas pressure in the outlet pipe detected by the pressure detection device 400.

[0064] The automatic control function is realized by the control component 500, which is used to control the switch valve 310 to connect the connection between the corresponding electrolyzer 200 and the gas-liquid separation device when the gas pressure in the outlet pipe reaches a preset pressure threshold, or the pressure difference between the gas pressure in the air inlet and the gas pressure in the outlet pipe reaches a preset pressure difference threshold, so as to avoid the gas pressure in the outlet pipe of the electrolyzer 200 being too small, resulting in the pressure difference between the gas pressure in the outlet pipe and the gas pressure in the air inlet failing to meet the requirement and causing gas blowby; it also avoids the gas pressure in the outlet pipe of the electrolyzer 200 being too large, resulting in the pressure difference between the gas pressure in the outlet pipe and the gas pressure in the air inlet exceeding the preset pressure difference threshold or other control standards, resulting in overpressure, affecting the control of the control valve 300 and the progress of the water electrolysis hydrogen production process.

[0065] Optionally, in the present invention, the outlet pipe includes a hydrogen outlet pipe 211 and an oxygen outlet pipe 212 which are independently arranged, and the air inlet portion includes a first air inlet portion 1011 and a second air inlet portion 1012; the hydrogen outlet pipes 211 of multiple electrolyzers 200 are respectively connected to the first air inlet portion 1011, and are interconnected through the first air inlet portion 1011; the oxygen outlet pipes 212 of multiple electrolyzers 200 are respectively connected to the second air inlet portion 1012, and are interconnected through the second air inlet portion 1012. Specifically, it is necessary to respectively set a switch valve 310 and a first pressure detection device 410 corresponding to the hydrogen outlet pipe 211 and the oxygen outlet pipe 212 of each electrolyzer 200, so as to control the switch valve 310 to be turned on when the pressure difference between the gas pressure in the first air inlet 1011 and the gas pressure in the hydrogen outlet pipe 211 reaches a preset first pressure difference threshold, and to control the switch valve 310 to be turned on when the pressure difference between the gas pressure in the second air inlet 1012 and the gas pressure in the oxygen outlet pipe reaches a preset second pressure difference threshold; the preset first pressure difference threshold and the preset second pressure difference threshold may be the same or different, which may be based on the detection accuracy of the first pressure detection device actually used and the pipeline setting, and is not limited here.

[0066] Taking the electrolysis water hydrogen production system as an example, N electrolyzers 200 are provided (N≥2, N is a positive integer), the outlet pipes of the N electrolyzers 200 are connected in parallel, and are connected to the air inlet of the gas-liquid separation device through a bus or other interconnecting lines. When 1 or N-1 electrolyzers 200 are in operation, the opened electrolyzers 200 have established a corresponding hydrogen system through the corresponding hydrogen outlet pipe 211 connected to the gas-liquid separation device, and established a corresponding oxygen system through the corresponding oxygen outlet pipe 212, and the established oxygen system and hydrogen system are in a high-pressure state. If the remaining N-1 or other electrolyzers 200 need to be opened, the corresponding switch valve 310 needs to be kept in a closed state first, and the electrolyzer 200 is opened first. After the electrolyzer 200 produces gas, the internal pressure of the electrolyzer 200 and the gas pressure in the gas outlet pipe are gradually increased until the pressure in the pipelines on both sides of the switch valve 310 (that is, the gas pressure in the air inlet and the gas pressure in the gas outlet pipe of the electrolyzer 200) are gradually equal, and after determining that the pressure difference reaches a preset pressure difference threshold value such as 8Pa, 15Pa, 20Pa, 50Pa, 70Pa or any other pressure difference value or pressure difference range suitable for actual use set according to the detection accuracy of the first pressure detection device, the switch valve 310 is connected. In this way, it can be avoided that the gas in the system enters the electrolyzer 200 opened later, causing damage to the exchange membrane of the electrolyzer 200 opened later, or causing the electrolyzer 200 opened later to have a safety hazard due to excessive concentration of oxygen in hydrogen or hydrogen in oxygen.

[0067] Reference Figure 3 As another example of an embodiment of the present invention, when the control valve 300 is a check valve 320:

[0068] In this example, the check valve 320 is triggered when the pressure difference between the gas pressure in the air inlet and the gas pressure in the air outlet pipe reaches a preset pressure difference threshold, and the connection between the electrolytic cell 200 and the gas-liquid separation device is connected.

[0069] The check valve 320 automatically controls the connection between the corresponding electrolytic cell 200 and the gas-liquid separation device according to the pressure difference between the gas pressure in the air inlet and the gas pressure in the air outlet pipe, so as to reduce the control process.

[0070] In one embodiment, the electrolysis water control device further includes a plurality of pressure detection devices 400 , each of which is disposed on the gas outlet pipe of the electrolytic cell 200 and is disposed close to the electrolytic cell 200 for detecting the gas pressure in the gas outlet pipe of the electrolytic cell 200 .

[0071] Optionally, the second pressure detection device 420 shown uses a remote pressure gauge, an electric contact pressure gauge or other second pressure detection device that can automatically detect pressure. The second pressure detection device 420 connected between the electrolytic cell 200 and the check valve 320 detects the gas pressure in the part of the outlet pipe between the electrolytic cell 200 and the check valve 320.

[0072] The water electrolysis control device also includes a control component 500. Taking the automatic control function of the water electrolysis control device realized by the remote control component 500 and other control components 500 that can comprehensively control the operation of each control valve 300 as an example, when the control valve 300 is a check valve 320, in one embodiment, the control component 500 is electrically connected to multiple electrolytic cells 200 and multiple pressure detection devices 400, respectively, and is used to control the corresponding electrolytic cell 200 to stop working when the gas pressure in the outlet pipe is greater than a preset pressure threshold.

[0073] The second pressure detection device 420 plays a safety maintenance role, and the control component 500 realizes the automatic control function, so that when the gas pressure in the outlet pipe between the electrolytic cell 200 and the check valve 320 is too high, the corresponding electrolytic cell 200 is controlled to be closed in time, so that the electrolytic cell 200 stops working. In this way, it can be used to prevent the check valve 320 from being unable to be opened in time due to problems such as failure of the check valve 320, causing the gas pressure in the pipe between the electrolytic cell 200 and the check valve 320 to be too high, resulting in safety problems.

[0074] Optionally, in the present invention, the gas outlet pipe includes a hydrogen gas outlet pipe 211 and an oxygen gas outlet pipe 212 which are independently arranged, and the gas inlet portion includes a first gas inlet portion 1011 and a second gas inlet portion 1012. The hydrogen gas outlet pipes 211 of the plurality of electrolyzers 200 are respectively connected to the first gas inlet portion 1011 and are interconnected through the first gas inlet portion 1011; the oxygen gas outlet pipes 212 of the plurality of electrolyzers 200 are respectively connected to the second gas inlet portion 1012 and are interconnected through the second gas inlet portion 1012. Specifically, a check valve 320 and a second pressure detection device 420 need to be respectively arranged corresponding to the hydrogen gas outlet pipe 211 and the oxygen gas outlet pipe 212 of each electrolyzer 200. When the gas pressure in the gas outlet pipe is much lower than the gas pressure in the gas inlet portion, the check valve 320 is always kept in a closed state. When the gas pressure in the gas outlet pipe is not lower than the gas pressure in the gas outlet pipe, the connection between the electrolyzer 200 and the gas-liquid separation device is automatically connected by the check valve 320. The second pressure detection device 420 plays a role in safety maintenance, and is used to control the electrolytic cell 200 to stop working when the check valve 320 fails and the connection between the electrolytic cell 200 and the gas-liquid separation device cannot be connected.

[0075] Taking the electrolysis water hydrogen production system as an example, N electrolyzers 200 are provided (N≥2, N is a positive integer), the outlet pipes of the N electrolyzers 200 are connected in parallel, and are connected to the air inlet of the gas-liquid separation device through a bus or other interconnecting lines. When 1 or N-1 electrolyzers 200 are in operation, the opened electrolyzers 200 have established a corresponding hydrogen system through the corresponding hydrogen outlet pipe 211 connected to the gas-liquid separation device, and established a corresponding oxygen system through the corresponding oxygen outlet pipe 212, and the established oxygen system and hydrogen system are in a high-pressure state. If the remaining N-1 or other electrolytic cells 200 need to be opened, the corresponding switch valve 310 needs to be kept in a closed state first, and the electrolytic cell 200 is opened first. After the electrolytic cell 200 produces gas, the internal pressure of the electrolytic cell 200 and the gas pressure in the gas outlet pipe gradually increase until the gas pressure in the gas outlet pipe of the electrolytic cell 200 is not less than the gas pressure in the gas inlet part, and the check valve 320 is automatically triggered to open, so that the gas produced by the corresponding electrolytic cell 200 enters the gas inlet part. When the connection between the electrolytic cell 200 and the gas-liquid separation device cannot be connected due to a failure of the check valve 320 or other reasons, so that the gas pressure in the gas outlet pipe between the electrolytic cell 200 and the check valve 320 is too high, the corresponding electrolytic cell 200 is promptly controlled to be shut down, so that the electrolytic cell 200 stops working to avoid safety problems.

[0076] As another embodiment of the present invention, the control valve 300 is a combination of a switch valve 310 and a check valve 320:

[0077] The electrolysis water control device further includes a plurality of pressure detection devices 400, wherein the plurality of pressure detection devices 400 include a first pressure detection device 410 and a second pressure detection device 420;

[0078] When the control valve 300 is a switch valve 310, each first pressure detection device 410 has a first detection end and a second detection end, the first detection end is connected to the air inlet, and is used to detect the gas pressure in the air inlet; the second detection end is connected to the outlet pipe of the corresponding electrolytic cell 200, and is used to detect the gas pressure in the outlet pipe; the control component 500 is electrically connected to the plurality of first pressure detection devices 410 and the plurality of switch valves 310, respectively, and is used to control the switch valve 310 to control the connection between the electrolytic cell 200 and the gas-liquid separation device to be on / off according to the gas pressure in the outlet pipe detected by the pressure detection device 400;

[0079] When the control valve 300 is the check valve 320, the check valve 320 is triggered when the pressure difference between the gas pressure in the air inlet and the gas pressure in the outlet pipe reaches a preset pressure difference threshold, and the connection between the electrolytic cell 200 and the gas-liquid separation device is connected; each second pressure detection device 420 is arranged on the outlet pipe of the electrolytic cell 200 and is arranged close to the electrolytic cell 200, and is used to detect the gas pressure in the outlet pipe of the electrolytic cell 200. The control component 500 is electrically connected to multiple electrolytic cells 200 and multiple second pressure detection devices 420, respectively, and is used to control the corresponding electrolytic cell 200 to stop working when the gas pressure in the outlet pipe is greater than the preset pressure threshold.

[0080] The embodiment corresponding to this example is basically the same as the corresponding embodiments when the control valve 300 is a switch valve 310 and the control valve 300 is a check valve 320 , so they are not described one by one here.

[0081] The utility model also provides a water electrolysis hydrogen production system, which includes the water electrolysis control device as above. Since the water electrolysis hydrogen production system adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, so it will not be repeated here one by one.

[0082] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A water electrolysis control device, characterized in that: include: The gas-liquid separation device is provided with an air inlet portion; A plurality of electrolytic cells, each of which is provided with an air outlet pipe, the air outlet pipes of the plurality of electrolytic cells are respectively connected to the air inlet part and are interconnected through the air inlet part; A plurality of control valves are arranged one-to-one on the gas outlet pipes of the plurality of electrolytic cells, and the control valves are used to control the on / off connection between the corresponding electrolytic cells and the gas-liquid separation device.

2. The electrolyzed water control device according to claim 1, characterized in that: The control valves are any one or a combination of switch valves and check valves.

3. The electrolyzed water control device according to claim 2, characterized in that: When the control valve is a switch valve, the electrolysis water control device also includes a plurality of pressure detection devices, each of which has a first detection end and a second detection end, the first detection end is connected to the air inlet part, and is used to detect the gas pressure in the air inlet part; the second detection end is connected to the outlet pipe of the corresponding electrolytic cell, and is used to detect the gas pressure in the outlet pipe.

4. The electrolyzed water control device according to claim 3, characterized in that: The water electrolysis control device also includes a control component, which is electrically connected to multiple pressure detection devices and multiple switch valves respectively, and is used to control the switch valve to control the connection between the electrolytic cell and the gas-liquid separation device based on the gas pressure in the outlet pipe detected by the pressure detection device.

5. The electrolysis water control device according to claim 2, characterized in that: When the control valve is a check valve, the check valve is triggered when the pressure difference between the gas pressure in the air inlet and the gas pressure in the air outlet pipe reaches a preset pressure difference threshold, and the connection between the electrolytic cell and the gas-liquid separation device is connected.

6. The electrolyzed water control device according to claim 5, characterized in that: The electrolysis water control device also includes a plurality of pressure detection devices, each of which is arranged on the gas outlet pipe of the electrolytic cell and is arranged close to the electrolytic cell to detect the gas pressure in the gas outlet pipe of the electrolytic cell.

7. The electrolyzed water control device according to claim 6, characterized in that: The water electrolysis control device also includes a control component, which is electrically connected to the multiple electrolytic cells and multiple pressure detection devices respectively, and is used to control the corresponding electrolytic cell to stop working when the gas pressure in the outlet pipe is greater than a preset pressure threshold.

8. The water electrolysis control device according to any one of claims 1 to 7, characterized in that: Each of the electrolytic cells is provided with a liquid inlet pipe, and the gas-liquid separation device is also provided with a liquid recovery outlet, and the liquid recovery outlet is respectively connected to the liquid inlet pipes of the plurality of electrolytic cells.

9. The water electrolysis control device according to any one of claims 1 to 7, characterized in that: The gas outlet pipe includes a hydrogen gas outlet pipe and an oxygen gas outlet pipe which are independently arranged, and the gas inlet portion includes a first gas inlet portion and a second gas inlet portion. The hydrogen gas outlet pipes of the plurality of electrolyzers are respectively connected to the first gas inlet portion and are interconnected through the first gas inlet portion; the oxygen gas outlet pipes of the plurality of electrolyzers are respectively connected to the second gas inlet portion and are interconnected through the second gas inlet portion.

10. A system for producing hydrogen by electrolysis of water, characterized in that: It comprises the water electrolysis control device as described in any one of claims 1 to 9.

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