Alkaline water electrolysis hydrogen production system, method for detecting hydrogen in oxygen, controller and system

Abstract

The invention provides an alkaline water electrolysis hydrogen production system, a method for detecting hydrogen in oxygen, a controller and a system. The system comprises a plurality of electrolytic cells, an oxygen side separation device and a device for detecting hydrogen in oxygen, the oxygen side separation device is communicated with the plurality of electrolytic baths, oxygen is obtained through separation from a gas-liquid mixture formed by electrolyzing water in the electrolytic baths, and alkali liquor obtained in the process of obtaining the oxygen through separation is discharged back to the plurality of electrolytic baths; the hydrogen-in-oxygen detection device is communicated with the plurality of electrolytic cells and is used for detecting the hydrogen content in oxygen of the gas-liquid mixture formed by each electrolytic cell; the device for detecting hydrogen in oxygen comprises an alkali liquor storage device which is used for storing alkali liquor separated in the process of detecting the content of hydrogen in oxygen in the gas-liquid mixture, and the alkali liquor storage device is directly or indirectly communicated with the electrolytic cells. The hydrogen content in independent oxygen of each electrolytic cell of the hydrogen production system can be detected, it is guaranteed that the concentration of alkali liquor in the alkaline water electrolysis hydrogen production system cannot be continuously reduced along with running time, and the hydrogen production performance of the system is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of water electrolysis hydrogen production, and in particular to an alkaline water electrolysis hydrogen production system, a method for detecting hydrogen in oxygen, a controller and a system. Background Art

[0002] Hydrogen has the characteristics of high energy density, long-term storage and almost no energy consumption. It is regarded as an ideal large-scale, long-term energy storage medium among renewable energy sources and can play a significant role in the adjustment of energy structure. Hydrogen production by water electrolysis is an efficient and clean hydrogen production technology. Its raw material is water, which has abundant reserves, and the hydrogen production process is simple. The product is green and pollution-free, making it the most promising large-scale hydrogen production technology.

[0003] Alkaline liquid hydrogen production is currently a very mature hydrogen production method with low cost and long life, and has been widely used in industrial production. Alkaline liquid hydrogen production systems include one-to-one (one electrolyzer corresponds to one separation system) and many-to-one structures (multiple electrolyzers correspond to one separation system). The separation system includes an oxygen side separation system and a hydrogen side separation system. The hydrogen content in oxygen (HTO) obtained by separating the oxygen side separation system is one of the important indicators for evaluating the operating status of the electrolyzer and the safety of the alkaline liquid hydrogen production system. For many-to-one hydrogen production systems, the hydrogen content in oxygen is usually sampled and tested at the outlet of the separation system. In this case, it is impossible to individually detect the hydrogen content in oxygen of the gas-liquid mixture discharged from each electrolyzer. Summary of the invention

[0004] One object of the present application is to provide an alkaline water electrolysis hydrogen production system, to achieve separate oxygen-hydrogen content detection of each electrolyzer in the hydrogen production system, and to ensure that the concentration of alkali solution in the alkaline water electrolysis hydrogen production system does not continue to decrease with the running time, thereby ensuring the hydrogen production performance of the system. Another object of the present application is to provide a method for detecting hydrogen in oxygen based on an alkaline water electrolysis hydrogen production system. Another object of the present application is to provide a controller. Another object of the present application is to provide a system for detecting hydrogen in oxygen based on an alkaline water electrolysis hydrogen production system. Another object of the present application is to provide a terminal device. Another object of the present application is to provide a computer-readable storage medium.

[0005] In order to achieve the above objectives, the present application discloses, on one hand, an alkaline water electrolysis hydrogen production system, comprising a plurality of electrolytic cells, an oxygen side separation device, and an oxygen-hydrogen detection device;

[0006] The oxygen-side separation device is in communication with the plurality of electrolytic cells, separates oxygen from the gas-liquid mixture formed by electrolyzing water in the electrolytic cells, and discharges the alkaline solution obtained in the process of separating oxygen back to the plurality of electrolytic cells;

[0007] The hydrogen-in-oxygen detection device is in communication with the plurality of electrolytic cells and is used to detect the hydrogen content in the oxygen of the gas-liquid mixture formed by each of the electrolytic cells;

[0008] The hydrogen-in-oxygen detection device comprises an alkali solution storage device for storing the alkali solution separated during the process of detecting the hydrogen content in oxygen of the gas-liquid mixture, and the alkali solution storage device is directly or indirectly connected to the plurality of electrolytic cells.

[0009] Optionally, the oxygen side separation device includes a first gas-liquid separator, a first scrubber, a first condenser, a first gas-water separator and a first water collector which are sequentially connected through pipelines;

[0010] The first gas-liquid separator is in communication with the plurality of electrolytic cells, receives the gas-liquid mixture formed by electrolyzing water in the electrolytic cells, and discharges the alkaline solution obtained in the process of separating oxygen back to the plurality of electrolytic cells;

[0011] A first switch valve is provided on the pipeline connecting the first gas-water separator and the first water collector;

[0012] The first water collector comprises an oxygen-side sewage outlet, the oxygen-side sewage outlet is connected to a sewage pipe, and a second switch valve is arranged on the sewage pipe.

[0013] Optionally, the hydrogen-in-oxygen detection device comprises at least one hydrogen-in-oxygen detection module and at least one alkali solution storage device, and each of the hydrogen-in-oxygen detection modules is connected to at least one of the electrolytic cells;

[0014] When one hydrogen-in-oxygen detection module is connected to a plurality of the electrolytic cells, a third switch valve is provided on the connecting pipe between the one hydrogen-in-oxygen detection module and each corresponding electrolytic cell.

[0015] Optionally, the hydrogen in oxygen detection module includes a second gas-liquid separator, a second scrubber, a second condenser, a second gas-water separator and an oxygen-hydrogen analyzer which are connected in sequence, each of the alkali liquid storage devices is connected to at least one of the second gas-liquid separators, and a fourth switch valve is provided on the pipeline connecting the alkali liquid storage device and the second gas-liquid separator;

[0016] The second gas-liquid separator is in communication with the corresponding electrolytic cell;

[0017] The alkali solution storage is connected to at least one of the electrolytic cell and / or the oxygen side separation device, and a fifth switch valve is arranged on the pipeline connecting the alkali solution storage and the corresponding electrolytic cell and / or the oxygen side separation device.

[0018] Optionally, the hydrogen in oxygen detection module further includes a water replenishment pump;

[0019] The water replenishment pump is arranged on a pipeline connecting the alkali solution storage device and the multiple electrolytic cells and / or the oxygen side separation device, and is used to transport the alkali solution in the alkali solution storage device to the correspondingly connected electrolytic cells and / or the oxygen side separation device.

[0020] Optionally, the hydrogen-in-oxygen detection module further includes a nitrogen purge component;

[0021] The nitrogen purge assembly includes a nitrogen tank connected to the second gas-liquid separator and a sixth switch valve arranged between the nitrogen tank and the second gas-liquid separator.

[0022] Optionally, the hydrogen-in-oxygen detection module further includes an exhaust pipe connected to the second gas-water separator and the hydrogen-in-oxygen analyzer;

[0023] The exhaust pipe is provided with a seventh switch valve.

[0024] Optionally, the second gas-liquid separator of the hydrogen-in-oxygen detection module is further connected to an oxygen discharge end of the oxygen-side separation device through which the oxygen is discharged, and an eighth switch valve is provided on the pipeline connecting the second gas-liquid separator and the oxygen discharge end.

[0025] The present application also discloses a method for detecting hydrogen in oxygen based on an alkaline water electrolysis hydrogen production system, wherein the alkaline water electrolysis hydrogen production system comprises a plurality of electrolytic cells, an oxygen side separation device, and an oxygen-in-hydrogen detection device;

[0026] The oxygen-side separation device is in communication with the multiple electrolytic cells, separates oxygen from the gas-liquid mixture formed by electrolyzing water in the electrolytic cells, and discharges the alkaline solution obtained in the process of separating oxygen back to the multiple electrolytic cells; the hydrogen-in-oxygen detection device is in communication with the multiple electrolytic cells, and is used to detect the hydrogen content in the oxygen of the gas-liquid mixture formed by each electrolytic cell; the hydrogen-in-oxygen detection device includes an alkaline solution storage device, which is used to store the alkaline solution separated in the process of detecting the hydrogen content in the oxygen of the gas-liquid mixture, and the alkaline solution storage device is directly or indirectly connected to the multiple electrolytic cells;

[0027] The method comprises:

[0028] Detecting the hydrogen content in oxygen of the gas-liquid mixture formed in each electrolytic cell by the hydrogen-in-oxygen detection device;

[0029] When a preset condition is reached, the alkali solution stored in the alkali solution storage is discharged to the plurality of electrolytic cells.

[0030] Optionally, when a preset condition is reached, discharging the alkali solution stored in the alkali solution storage device to the plurality of electrolytic cells comprises:

[0031] When the alkali solution capacity in the oxygen-side separation device decreases to a preset limit or reaches a preset time condition, the alkali solution stored in the alkali solution storage is discharged to the plurality of electrolytic cells.

[0032] Optionally, the hydrogen-in-oxygen detection device comprises at least one hydrogen-in-oxygen detection module and at least one alkali solution storage device, and each of the hydrogen-in-oxygen detection modules is connected to at least one of the electrolytic cells;

[0033] When one oxygen-hydrogen detection module is connected to a plurality of the electrolytic cells, a third switch valve is provided on the connecting pipe between the one oxygen-hydrogen detection module and each corresponding electrolytic cell;

[0034] The method further comprises:

[0035] One of the third switch valves is controlled to open and the other third switch valves are controlled to close in sequence, and the hydrogen content in oxygen detected by the hydrogen-in-oxygen detection module corresponding to the third switch valve in the open state is obtained.

[0036] Optionally, the hydrogen-in-oxygen detection module further includes a nitrogen purge component;

[0037] The nitrogen purge assembly includes a nitrogen tank connected to the second gas-liquid separator and a sixth switch valve arranged between the nitrogen tank and the second gas-liquid separator;

[0038] The method comprises:

[0039] Control all the third switch valves to close, the sixth switch valve to open, and use the nitrogen tank of the nitrogen purge assembly to output nitrogen to purge the gas in the second gas-liquid separator;

[0040] After the predetermined purge condition is reached, the sixth switch valve is closed.

[0041] Optionally, the second gas-liquid separator of the hydrogen-in-oxygen detection module is further connected to an oxygen discharge end of the oxygen-side separation device for discharging the oxygen, and an eighth switch valve is provided on the pipeline connecting the second gas-liquid separator and the oxygen discharge end;

[0042] The method comprises:

[0043] Controlling one of the third switch valves among all the third switch valves to open, and after the other third switch valves are closed, controlling the eighth switch valve to open, so as to input the oxygen discharged from the oxygen side separation device into the second gas-liquid separator;

[0044] The hydrogen content in oxygen detected by the hydrogen-in-oxygen detection module corresponding to the third switch valve in the open state is obtained, and the hydrogen content in oxygen is corrected based on the flow rate of oxygen discharged from the oxygen-side separation device.

[0045] The present application also discloses a controller, which is applied to an alkaline water electrolysis hydrogen production system, wherein the alkaline water electrolysis hydrogen production system comprises a plurality of electrolytic cells, an oxygen side separation device, and an oxygen-hydrogen detection device;

[0046] The oxygen-side separation device is in communication with the multiple electrolytic cells, separates oxygen from the gas-liquid mixture formed by electrolyzing water in the electrolytic cells, and discharges the alkaline solution obtained in the process of separating oxygen back to the multiple electrolytic cells; the hydrogen-in-oxygen detection device is in communication with the multiple electrolytic cells, and is used to detect the hydrogen content in the oxygen of the gas-liquid mixture formed by each electrolytic cell; the hydrogen-in-oxygen detection device includes an alkaline solution storage device, which is used to store the alkaline solution separated in the process of detecting the hydrogen content in the oxygen of the gas-liquid mixture, and the alkaline solution storage device is directly or indirectly connected to the multiple electrolytic cells;

[0047] The controller comprises:

[0048] A detection control module, used for detecting the hydrogen content in oxygen of the gas-liquid mixture formed by each of the electrolytic cells through the hydrogen-in-oxygen detection device;

[0049] The alkali solution circulation control module is used to discharge the alkali solution stored in the alkali solution storage to the multiple electrolytic cells when a preset condition is reached.

[0050] The present application also discloses a hydrogen-in-oxygen detection system based on an alkaline water electrolysis hydrogen production system, comprising the alkaline water electrolysis hydrogen production system as described above and the controller as described above.

[0051] The present application also discloses a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above method when executing the computer program.

[0052] The present application also discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described above is implemented.

[0053] The oxygen-hydrogen detection device in the alkaline water electrolysis hydrogen production system of the present application is connected to the multiple electrolyzers, and can detect the oxygen-hydrogen content of the gas-liquid mixture formed by each of the electrolyzers. At the same time, an alkali liquid storage device is provided in the oxygen-hydrogen detection device, which can be used to store the alkali liquid separated in the process of detecting the oxygen-hydrogen content of the gas-liquid mixture. The alkali liquid storage device is directly or indirectly connected to the multiple electrolyzers, and the alkali liquid stored in the alkali liquid storage device can be discharged back to the multiple electrolyzers. The oxygen-hydrogen detection device of the present application stores the alkali liquid separated in the process of detecting the oxygen-hydrogen content of the gas-liquid mixture in the alkali liquid storage device while realizing the detection of the oxygen-hydrogen content of each electrolyzer, and then the alkali liquid in the alkali liquid storage device can be discharged back to the multiple electrolyzers, replenishing the alkali liquid lost in the electrolyzer and the oxygen-side separation device during the detection of the oxygen-hydrogen content, ensuring that the alkali concentration in the alkaline water electrolysis hydrogen production system will not continue to decrease with the running time, and ensuring the hydrogen production performance of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0055] Figure 1 to Figure 4 A schematic diagram showing a specific embodiment of the alkaline water electrolysis hydrogen production system of the present application;

[0056] Figure 5 A schematic diagram showing a specific embodiment of the controller of the present application;

[0057] Description of reference numerals:

[0058] 100, electrolytic cell; 200, oxygen side separation device; 300, oxygen-hydrogen detection device; 210, first gas-liquid separator; 220, first scrubber; 230, first condenser; 240, first gas-water separator; 250, first water collector; 301, second gas-liquid separator; 302, second scrubber; 303, second condenser; 304, second gas-water separator; 305, oxygen-hydrogen analyzer; 306, alkali liquid storage device; 307, pressure reducing valve; 308, flow regulating valve; 309, water supply pump; 310, nitrogen tank; 311, liquid level transmitter; 312, pressure gauge; S1, first switch valve; S2, second switch valve; S3, third switch valve; S4, fourth switch valve; S5, fifth switch valve; S6, sixth switch valve; S7, seventh switch valve; S8, eighth switch valve; S9, ninth switch valve. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0060] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0061] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0062] Positional relationships such as “parallel” or “perpendicular” include not only completely “parallel” or “perpendicular” positional relationships, but also positional relationships whose angle deviations relative to completely “parallel” or “perpendicular” are within a preset deviation range.

[0063] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0064] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figure 1 to Figure 5 The present application is described in detail with reference to embodiments.

[0066] In the prior art, a multi-to-one structure shares a set of oxygen-side separation systems. The hydrogen production system usually sets an oxygen-hydrogen analyzer 305 at the outlet of the oxygen-side separation system to detect the oxygen-hydrogen content of the total amount of oxygen in multiple electrolyzers 100. As a result, it is impossible to judge the operating status of a single electrolyzer 100 by detecting the oxygen-hydrogen content at the outlet of the separation system. If a single or a few electrolyzers 100 have a diaphragm breakage or other faults, the HTO at the outlet of the cell will be significantly increased, but because the HTO at the outlet of the other normally operating electrolyzers 100 remains at a low value, the HTO at the outlet of the separation system remains within a safe and controllable range, and thus the safety hazard cannot be detected in time. In order to detect the oxygen-hydrogen content of each electrolyzer 100, the present application separately sets up a set of oxygen-hydrogen content detection devices to separate and detect the gas-liquid mixture input to each electrolyzer 100 in the alkaline water electrolysis hydrogen production system, so that part of the gas-liquid mixture formed by the electrolysis of water in each electrolyzer 100 enters the oxygen-hydrogen detection device 300 for separate oxygen-hydrogen content detection of each electrolyzer 100. However, during the process of detecting the hydrogen content in oxygen of the gas-liquid mixture by the hydrogen in oxygen detection device 300, alkali liquid will be separated out, and these alkali liquids will remain in the hydrogen in oxygen detection device 300, resulting in the loss of alkali liquid in the electrolyzer 100 and the oxygen side separation device 200, affecting the hydrogen production performance. If it is supplemented by adding pure water, the concentration of alkali liquid in the separation system will be reduced, affecting the electrolysis efficiency. Based on this, the hydrogen in oxygen detection device 300 of the present application is provided with an alkali liquid storage device 306, and the alkali liquid entering the hydrogen in oxygen detection device 300 is first discharged into the alkali liquid storage device 306 for temporary storage, and then the alkali liquid in the alkali liquid storage device 306 can be output to multiple electrolyzers 100 when necessary, so as to maintain the alkali liquid content in the electrolyzer 100, and ensure that the alkali liquid concentration in the alkaline water electrolysis hydrogen production system will not decrease with the running time.

[0067] According to one aspect of the present application, this embodiment discloses an alkaline water electrolysis hydrogen production system. Figure 1 As shown, the alkaline water electrolysis hydrogen production system includes a plurality of electrolytic cells 100 , an oxygen side separation device 200 and an oxygen-hydrogen detection device 300 .

[0068] The oxygen-side separation device 200 is connected to the multiple electrolytic cells 100 to separate oxygen from the gas-liquid mixture formed by electrolyzing water in the electrolytic cells 100, and discharges the alkaline solution obtained in the process of separating oxygen back to the multiple electrolytic cells 100.

[0069] The hydrogen-in-oxygen detection device 300 is in communication with the plurality of electrolytic cells 100 , and is used to detect the hydrogen content in the oxygen of the gas-liquid mixture formed by each of the electrolytic cells 100 .

[0070] The hydrogen-in-oxygen detection device 300 includes an alkali solution storage device 306 for storing the alkali solution separated during the process of detecting the hydrogen content in oxygen of the gas-liquid mixture. The alkali solution storage device 306 is directly or indirectly connected to the plurality of electrolytic cells 100 .

[0071] The oxygen-hydrogen detection device 300 in the alkaline water electrolysis hydrogen production system of the present application is connected to the multiple electrolytic cells 100, and can detect the oxygen-hydrogen content of the gas-liquid mixture formed by each electrolytic cell 100. At the same time, an alkali liquid storage 306 is provided in the oxygen-hydrogen detection device 300, and the alkali liquid storage 306 can be used to store the alkali liquid separated during the detection of the oxygen-hydrogen content of the gas-liquid mixture. The alkali liquid storage 306 is directly or indirectly connected to the multiple electrolytic cells 100, and the alkali liquid stored in the alkali liquid storage 306 can be discharged back to the multiple electrolytic cells 100. The hydrogen-in-oxygen detection device 300 of the present application can detect the hydrogen-in-oxygen content of each electrolytic cell 100 and store the alkaline solution separated in the process of detecting the hydrogen-in-oxygen content of the gas-liquid mixture in the alkaline solution storage device 306. The alkaline solution in the alkaline solution storage device 306 can then be discharged back to the multiple electrolytic cells 100 to replenish the alkaline solution lost in the electrolytic cell 100 and the oxygen-side separation device 200 during the detection of the hydrogen-in-oxygen content, thereby ensuring that the alkaline solution concentration in the alkaline water electrolysis hydrogen production system will not continue to decrease with the operating time, thereby ensuring the hydrogen production performance of the system.

[0072] In an optional embodiment, the oxygen-side separation device 200 includes a first gas-liquid separator 210, a first scrubber 220, a first condenser 230, a first gas-water separator 240 and a first water collector 250 which are sequentially connected through pipelines.

[0073] The first gas-liquid separator 210 is connected to the multiple electrolytic cells 100, receives the gas-liquid mixture formed by the electrolytic cells 100 electrolyzing water, and discharges the alkaline solution obtained in the process of separating oxygen back to the multiple electrolytic cells 100. A first switch valve S1 is provided on the pipeline connecting the first gas-water separator 240 and the first water collector 250; the first water collector 250 includes an oxygen-side sewage outlet, the oxygen-side sewage outlet is connected to a sewage pipeline, and a second switch valve S2 is provided on the sewage pipeline.

[0074] Specifically, the structure and function of the oxygen side separation device 200 are similar to those of the prior art. The oxygen side separation device 200 sequentially processes the gas-liquid mixture formed by electrolyzing water in the electrolytic cell 100 through the first gas-liquid separator 210, the first scrubber 220, the first condenser 230 and the first gas-water separator 240, and obtains oxygen by repeated gas-liquid separation and cleaning, and discharges the separated oxygen through the oxygen exhaust port. Of course, in actual applications, those skilled in the art can set the specific structure of the oxygen side separation device 200 according to needs, which is a conventional technical means in the field and will not be repeated here.

[0075] Among them, the liquid separated in the first gas-water separator 240 can be discharged through the first water collector 250 and the sewage pipe. Specifically, when the first switch valve S1 is opened, the liquid in the first gas-water separator 240 is discharged to the first water collector 250 through the pipe connected between the first gas-water separator 240 and the first water collector 250. When the second switch valve S2 is opened, the liquid in the first water collector 250 is discharged through the sewage pipe connected to the oxygen-side sewage outlet to prevent the accumulation of liquid in the first gas-water separator 240.

[0076] Optionally, in practical applications, the opening and closing of the first switch valve S1 and the second switch valve S2 may be controlled by an oxygen side separation controller disposed inside or externally connected to the oxygen side separation device 200 to achieve liquid discharge control of the first gas-water separator 240 .

[0077] The first gas-water separator 240 is provided with an oxygen discharge end for discharging oxygen, and the oxygen discharge end can be connected to an oxygen discharge pipeline to discharge the separated oxygen. Optionally, a ninth switch valve S9 can be provided on the oxygen discharge pipeline, and the discharge of oxygen is controlled by opening and closing the ninth switch valve S9. Among them, the ninth switch valve S9 can adopt a common switch valve such as a pneumatic ball valve, and preferably a diaphragm regulating ball valve can also be adopted, so that the discharge of oxygen is automatically controlled based on the air pressure in the system through the diaphragm regulating ball valve to maintain the air pressure balance in the system.

[0078] In an optional embodiment, the hydrogen in oxygen detection device 300 includes at least one hydrogen in oxygen detection module and at least one alkali solution storage 306, and each of the hydrogen in oxygen detection modules is connected to at least one of the electrolyzers 100. When one hydrogen in oxygen detection module is connected to multiple electrolyzers 100, a third switch valve S3 is provided on the connecting pipe between the one hydrogen in oxygen detection module and each corresponding electrolyzer 100.

[0079] It should be noted that the alkali liquid hydrogen production system is usually composed of an electrolyzer 100, a separation system, an auxiliary system, a public auxiliary system, and an electrical system. The separation system is mainly used for separation of hydrogen / oxygen and alkali liquid mixture, preliminary purification of hydrogen, and circulation cooling of alkali liquid, and can be composed of a gas-liquid separator, an alkali liquid pump, a heat exchanger, a scrubber, a condenser, and a gas-water separator. At present, the alkali liquid hydrogen production system includes a one-to-one and a many-to-one structure. In a large-scale alkali liquid hydrogen production system, an integrated, modular structure in the form of many-to-one is imperative.

[0080] In a many-to-one hydrogen production system, since multiple electrolyzers 100 share a set of separation systems, that is, multiple electrolyzers 100 are connected to an oxygen-side separation device 200, it is impossible to judge the operating status of a single electrolyzer 100 by detecting the hydrogen content in the oxygen at the outlet of the separation system. If a single or a few electrolyzers 100 have a diaphragm breakage or other faults, the HTO at the outlet of the cell will increase significantly, but since the HTO at the outlet of the other normally operating electrolyzers 100 remains at a low value, the HTO at the outlet of the separation system remains within a safe and controllable range, and safety hazards cannot be detected in time. Therefore, in a many-to-one hydrogen production scenario, it is necessary to individually detect the HTO content at the outlet of each electrolyzer 100 to determine the operating status of the electrolyzer 100.

[0081] In this optional embodiment, each hydrogen-in-oxygen detection module can independently detect the hydrogen content in oxygen of one electrolyzer 100. When the number of electrolyzers 100 in the system is the same as the number of hydrogen-in-oxygen detection modules in the hydrogen-in-oxygen detection device 300, the hydrogen-in-oxygen detection modules and the electrolyzers 100 can be matched one-to-one to perform hydrogen content detection in oxygen.

[0082] Among them, since the oxygen at the outlet of the many-to-one oxygen side separation device 200 cannot measure the hydrogen content in oxygen of each electrolytic cell 100, in this optional embodiment, the hydrogen in oxygen detection device 300 is connected to each electrolytic cell 100 respectively, and the gas-liquid mixture discharged from the electrolytic cell 100 is directly obtained to separate the oxygen and detect the hydrogen content in oxygen, thereby realizing the separate detection of the hydrogen content in oxygen of each electrolytic cell 100.

[0083] Optionally, a pipe connected to the hydrogen-in-oxygen detection module may be introduced into the pipe connecting the electrolyzer 100 and the first gas-liquid separator 210 of the oxygen-side separation device 200, so that a portion of the gas-liquid mixture entering the oxygen-side separation device 200 from the electrolyzer 100 can enter the hydrogen-in-oxygen detection module for hydrogen content detection in oxygen. Of course, in actual applications, other methods such as a separate opening on the electrolyzer 100 may be used to allow a portion of the gas-liquid mixture discharged from the electrolyzer 100 to enter the hydrogen-in-oxygen detection module for hydrogen content detection in oxygen, and this application does not limit this specific implementation method.

[0084] However, this one-to-one separate detection solution requires that the oxygen-hydrogen detection device 300 be provided with the same number of oxygen-hydrogen detection modules as the number of electrolyzers 100, which will lead to a complex system structure and increased costs. If multiple electrolyzers 100 share one oxygen-hydrogen detection module and perform oxygen-hydrogen detection at the same time, the detection results of the multiple electrolyzers 100 will affect each other.

[0085] In order to simplify the system structure and reduce the cost, the hydrogen content in oxygen of the gas-liquid mixture formed by each electrolyzer 100 can be detected. In this optional embodiment, one hydrogen-in-oxygen detection module can be connected to multiple electrolyzers 100 through pipelines, and a third switch valve S3 is set on the connecting pipeline between the hydrogen-in-oxygen detection module and each corresponding electrolyzer 100. Figure 2 In each detection process of hydrogen content in oxygen, only one third switch valve S3 is opened, and the other third switch valves S3 are kept closed. In this way, only the gas-liquid mixture discharged from one electrolytic cell 100 can enter the hydrogen content in oxygen detection module in each detection. Then, by opening each third switch valve S3 in turn, the hydrogen content in oxygen of the connected electrolytic cells 100 can be detected in turn.

[0086] In an optional embodiment, a hydrogen-in-oxygen analyzer 305 may be provided at the oxygen outlet of the oxygen-side separation device 200 to analyze the overall content of hydrogen-in-oxygen in the total amount of oxygen output by the multiple electrolyzers 100. If the overall content of hydrogen-in-oxygen fluctuates to a preset fluctuation range, the hydrogen-in-oxygen detection module of the hydrogen-in-oxygen detection device 300 sequentially opens the third switch valve S3 to detect the hydrogen-in-oxygen content of each electrolyzer 100 individually, and determines the electrolyzer 100 with a fault, so as to quickly and accurately locate the faulty electrolyzer 100 and eliminate the fault, thereby avoiding the shutdown inspection of the entire hydrogen production system. Of course, in other optional embodiments, the hydrogen-in-oxygen detection module may also be continuously used to sequentially open the third switch valve S3 to detect the hydrogen-in-oxygen content of each electrolyzer 100 in turn, so as to promptly find the electrolyzer 100 with a fault and eliminate the fault. Those skilled in the art may set the control flow of hydrogen-in-oxygen content detection of multiple electrolyzers 100 separately according to actual needs, and the present application does not limit this.

[0087] Among them, optionally, multiple electrolyzers 100 can be connected to the oxygen-hydrogen detection module through independent pipelines, or multiple electrolyzers 100 can be connected to a branch pipeline respectively, and multiple branch pipelines are connected to one end of a main pipeline, and the other end of the main pipeline is connected to the oxygen-hydrogen detection module. In this case, the third switch valve S3 needs to be set on the branch pipeline to ensure that only the gas-liquid mixture of one branch pipeline can enter the oxygen-hydrogen detection module through the main pipeline for oxygen-hydrogen content detection each time.

[0088] In an optional embodiment, the oxygen-hydrogen detection module includes a second gas-liquid separator 301, a second scrubber 302, a second condenser 303, a second gas-water separator 304 and an oxygen-hydrogen analyzer 305 which are connected in sequence, each of the alkali liquid storage devices 306 is connected to at least one of the second gas-liquid separators 301, and a fourth switch valve S4 is provided on the pipeline connecting the alkali liquid storage device 306 and the second gas-liquid separator 301. The second gas-liquid separator 301 is connected to the corresponding electrolyzer 100; the alkali liquid storage device 306 is connected to at least one of the electrolyzer 100 and / or the oxygen side separation device 200, and a fifth switch valve S5 is provided on the pipeline connecting the alkali liquid storage device 306 and the corresponding electrolyzer 100 and / or the oxygen side separation device 200.

[0089] Specifically, it is understandable that after the hydrogen-in-oxygen detection module obtains the gas-liquid mixture formed by the electrolyzer 100, it is necessary to separate the oxygen sample from the gas-liquid mixture and then detect the hydrogen content in the oxygen sample. Based on this, the structure of the hydrogen-in-oxygen detection module can be similar to that of the oxygen side separation device 200, that is, the hydrogen-in-oxygen detection module performs gas-liquid separation and cleaning steps on the gas-liquid mixture through the second gas-liquid separator 301, the second scrubber 302, the second condenser 303 and the second gas-water separator 304 to obtain the oxygen sample, and then measures the hydrogen content in the oxygen sample through the hydrogen-in-oxygen analyzer 305, which is the hydrogen content in the oxygen discharged from the oxygen side separation device 200. The alkaline liquid separated from the gas-liquid mixture by the second gas-liquid separator 301 is directly or indirectly discharged back to the electrolytic cell 100 through the alkaline liquid storage 306, and the separated gas first enters the second scrubber 302 to remove impurities such as alkaline mist contained in the gas, and then passes through the second condenser 303 and the second gas-water separator 304 for gas cooling and water removal, and finally the obtained oxygen sample enters the oxygen-hydrogen analyzer 305. After the washing, condensation and gas-water separation process, it is not only helpful to improve the detection accuracy of the oxygen-hydrogen analyzer 305, but also conducive to improving the service life of the analyzer.

[0090] Optionally, a pressure reducing valve 307 and a flow regulating valve 308 may be provided between the second gas-water separator 304 and the oxygen-hydrogen analyzer 305 , and the gas flow entering the oxygen-hydrogen analyzer 305 may be controlled by the pressure reducing valve 307 and the flow regulating valve 308 .

[0091] It should be noted that the number of hydrogen in oxygen detection modules included in the hydrogen in oxygen detection device 300 may be one or more; the number of alkali liquid storage devices 306 may be one or more. Thus, each alkali liquid storage device 306 may be connected to the second gas-liquid separator 301 of one hydrogen in oxygen detection module to store the alkali liquid of one hydrogen in oxygen detection module, or may be connected to the second gas-liquid separators 301 of multiple hydrogen in oxygen detection modules to store the alkali liquid of multiple hydrogen in oxygen detection modules. Preferably, as Figure 4 As shown, an alkali solution storage 306 may be provided to store the alkali solutions of all the hydrogen-in-oxygen detection modules, and the alkali solution stored in the alkali solution storage 306 is recycled back to each electrolytic cell 100 to reduce the structural complexity of the system.

[0092] In this embodiment, the oxygen side separation device 200 discharges the alkali solution obtained in the process of separating oxygen back to the multiple electrolytic cells 100, so that the alkali solution in the oxygen side separation device 200 is in a dynamic equilibrium state with the alkali solution in the electrolytic cell 100. Then, the alkali solution storage 306 can be connected to at least one of the electrolytic cells 100 and / or the oxygen side separation device 200, so that the alkali solution stored in the alkali solution storage 306 can be discharged to the electrolytic cell 100 and / or the oxygen side separation device 200, and the alkali solution in the electrolytic cell 100 can be replenished.

[0093] Among them, in the specific implementation, the alkali liquid storage device 306 can be connected to the electrolytic cell 100 through a pipeline, so that the alkali liquid in the alkali liquid storage device 306 can be directly discharged back to the electrolytic cell 100; the alkali liquid storage device 306 can also be connected to the first gas-liquid separator 210 of the oxygen side separation device 200 through a pipeline, and the alkali liquid in the alkali liquid storage device 306 is first discharged back to the first gas-liquid separator 210, and then transported back to the electrolytic cell 100 through the first gas-liquid separator 210; of course, the alkali liquid storage device 306 can also be connected to the electrolytic cell 100 and the first gas-liquid separator 210 at the same time, so that the alkali liquid can be transported back to the electrolytic cell 100 through any of the pathways.

[0094] When the alkali liquid storage 306 is connected to the electrolytic cell 100, the existing structures of each electrolytic cell 100 need to be improved to achieve the connection. However, in a many-to-one hydrogen production system, it is preferred to open a hole in the first gas-liquid separator 210 to connect it to the alkali liquid storage 306 through a pipeline to reduce the difficulty of improving the structure of the existing hydrogen production system for discharging the alkali liquid.

[0095] When the hydrogen content in oxygen is detected, when the third switch valve S3 is provided on the connecting pipe between the hydrogen detection module in oxygen and each corresponding electrolyzer 100, the third switch valve S3 can be controlled to open, and the fourth switch valve S4 provided on the pipe connecting the alkali liquid storage device 306 and the second gas-liquid separator 301 is closed, and the alkali liquid in the second gas-liquid separator 301 will gradually increase. When the upper limit of the liquid level is reached, the third switch valve S3 is controlled to close, and the fourth switch valve S4 is opened, and the alkali liquid separated from the second gas-liquid separator 301 is discharged to the alkali liquid storage device 306 for temporary storage. When the alkali liquid in the second gas-liquid separator 301 reaches the lower limit of the liquid level, the fourth switch valve S4 is controlled to close, and the third switch valve S3 is opened, and the hydrogen content in oxygen is continued to be detected. Among them, the liquid level of the alkali liquid can be detected by devices such as the liquid level transmitter 311. Of course, in actual applications, a fixed time point or time interval can be set to discharge the alkali liquid in the second gas-liquid separator 301 at a fixed time point or at a preset time interval. Those skilled in the art can set the control conditions for the discharge of the alkali liquid according to actual needs, and the present application does not limit this.

[0096] In other embodiments, when the alkali discharge process of the second gas-liquid separator 301 varies greatly, the fourth switch valve S4 between the second gas-liquid separator 301 and the alkali liquid storage device 306 can be set as a membrane regulating valve. The liquid level height is automatically adjusted by setting the membrane regulating valve to achieve the balance of the alkali liquid inlet and outlet of the second gas-liquid separator 301, so as to simplify the alkali discharge control.

[0097] Optionally, when the second gas-liquid separator 301 is connected to the alkali liquid storage 306, the alkali liquid outlet position should be ensured to be located at the highest point to ensure that the alkali liquid in the second gas-liquid separator 301 can be discharged into the alkali liquid storage 306 by gravity. Of course, in actual application, the alkali liquid can also be discharged to the alkali liquid storage 306 by other active methods, and this application is not limited to this.

[0098] A fifth switch valve S5 is provided on the pipeline connecting the alkali liquid storage 306 and the corresponding electrolytic cell 100 and / or the oxygen side separation device 200. When the preset condition is reached, the fifth switch valve S5 can be controlled to open, so that the alkali liquid stored in the alkali liquid storage 306 is discharged to the multiple electrolytic cells 100, that is, discharged to the electrolytic cell 100 and / or the oxygen side separation device 200. Among them, the preset condition can be the situation that the alkali liquid capacity in the oxygen side separation device 200 is reduced to a preset limit value or reaches a preset time condition. For example, in one embodiment, the preset limit value can be a liquid level value set according to actual needs. The liquid level value of the first gas-liquid separator 210 can be obtained by setting a liquid level transmitter 311 in the first gas-liquid separator 210 of the oxygen side separation device 200. If the liquid level value reaches the preset limit value, the fifth switch valve S5 is controlled to open, so that the alkali liquid stored in the alkali liquid storage 306 is discharged. In another embodiment, the preset time condition may be a preset time point or a time interval, and the alkali solution stored in the alkali solution storage 306 is discharged when the preset time point is reached or every preset time interval. Of course, in practical applications, those skilled in the art may determine the preset conditions according to actual conditions, and this application does not limit this.

[0099] Optionally, in order to avoid the alkali solution discharge process taking too long, the diameter of the pipe connecting the second gas-liquid separator 301 and the alkali solution storage 306 should be larger than the diameter of the pipe connecting the outlet of the electrolytic cell 100 and the second gas-liquid separator 301 .

[0100] In an optional embodiment, the hydrogen in oxygen detection module further includes a water replenishment pump 309. The water replenishment pump 309 is disposed on a pipeline connecting the alkali solution storage 306 and the plurality of electrolytic cells 100 and / or the oxygen side separation device 200, and is used to transport the alkali solution in the alkali solution storage 306 to the correspondingly connected electrolytic cells 100 and / or the oxygen side separation device 200.

[0101] It is understandable that the positional relationship between the alkali liquid storage 306 and the electrolytic cell 100 or the oxygen side separation device 200 can be set so that the alkali liquid in the alkali liquid storage 306 can be discharged under its own gravity. Of course, the alkali liquid discharge can also be assisted by the water replenishment pump 309. After the fifth switch valve S5 is controlled to open, the water replenishment pump 309 is started to transport the alkali liquid in the alkali liquid storage 306 to the corresponding connected electrolytic cell 100 and / or the oxygen side separation device 200 to improve the alkali liquid discharge efficiency. Among them, transporting the alkali liquid in the alkali liquid storage 306 to the oxygen side separation device 200 means transporting it to the first gas-liquid separator 210 in the oxygen side separation device 200, etc., which separates the alkali liquid and circulates it back to the electrolytic cell 100.

[0102] Since the air intake of the oxygen-hydrogen analyzer 305 is small, the oxygen sample separated by the small-capacity oxygen-hydrogen detection module can meet the gas source demand of the analyzer. A small pipeline is drawn from the main pipeline connecting each electrolyzer 100 and the oxygen-side separation device 200 to the oxygen-hydrogen detection module. The flow rate of the gas-liquid mixture in the small pipeline is determined by the air intake of the oxygen-hydrogen analyzer 305. Since the oxygen-hydrogen detection module has no other exhaust channels except the analyzer air intake, the air intake flow rate of the oxygen-hydrogen detection module and the air intake flow rate of the oxygen-hydrogen analyzer 305 should be guaranteed to be the same. If the former is greater than the latter, the pressure in the oxygen-hydrogen detection module will continue to increase. If the former is less than the latter, the pressure in the oxygen-hydrogen detection module will continue to decrease, which will cause safety problems.

[0103] Optionally, the second gas-water separator 304 of the hydrogen-in-oxygen detection module can be connected to the second scrubber 302, so that the liquid discharged from the second gas-water separator 304 directly flows back to the second gas-liquid separator 301, thereby reducing the structural complexity and the control complexity of the second gas-water separator 304.

[0104] In an optional embodiment, the hydrogen in oxygen detection module further includes a nitrogen purge assembly. The nitrogen purge assembly includes a nitrogen tank 310 connected to the second gas-liquid separator 301 and a sixth switch valve S6 disposed between the nitrogen tank 310 and the second gas-liquid separator 301 .

[0105] Specifically, in order to ensure the safety of the hydrogen-in-oxygen detection module when the detection of hydrogen content in oxygen is stopped, in this optional embodiment, a nitrogen purge assembly is provided. During nitrogen purge, the sixth switch valve S6 can be controlled to open, so that the nitrogen in the nitrogen tank 310 can purge the entire hydrogen-in-oxygen detection module through the second gas-liquid separator 301, and discharge the flammable gas remaining in the hydrogen-in-oxygen detection module. It should be noted that during nitrogen purge, the third switch valve S3 provided on the pipeline connecting the second gas-liquid separator 301 and the electrolytic cell 100 and the fourth switch valve S4 between the second gas-liquid separator 301 and the alkali liquid storage 306 need to be in a closed state to prevent nitrogen from affecting parts such as electrolytic hydrogen production.

[0106] After the predetermined purging condition is reached, the purging ends and the sixth switch valve S6 is closed. The purging condition includes but is not limited to the purging duration and other conditions. Those skilled in the art can set the purging condition according to actual needs, and this application does not limit this.

[0107] In an optional embodiment, if Figure 3 As shown, the hydrogen-in-oxygen detection module further includes an exhaust pipe connected to the second gas-water separator 304 and the hydrogen-in-oxygen analyzer 305; a seventh switch valve S7 is provided on the exhaust pipe.

[0108] Specifically, the exhaust pipe is connected to the connecting pipe of the second gas-water separator 304 and the oxygen-hydrogen analyzer 305. The pressure of the oxygen-hydrogen detection module can be adjusted by the seventh switch valve S7 arranged on the exhaust pipe, and the air intake flow rate of the connecting pipe between the outlet of the electrolyzer 100 and the second gas-liquid separator 301 is no longer limited by the air intake flow rate of the oxygen-hydrogen analyzer 305; when the air intake volume is large, the excess gas can be discharged through the seventh switch valve S7 to ensure pressure stability; when the pressure fluctuates at the air inlet of the second gas-liquid separator 301, the pressure can also be leveled with the help of the seventh switch valve S7.

[0109] Optionally, the seventh switch valve S7 can be an electrically controlled switch valve such as a pneumatic ball valve, and the pressure in the oxygen-hydrogen detection module can be detected by a pressure detection device such as a pressure gauge 312, and then the pressure can be regulated by controlling the opening or closing of the seventh switch valve S7. Preferably, the seventh switch valve S7 can be an automatic switch valve such as a diaphragm regulating valve, and the pressure of the oxygen-hydrogen detection module can be automatically regulated by setting the diaphragm regulating valve, which has a simple structure and operation and low cost.

[0110] In an optional embodiment, the second gas-liquid separator 301 of the hydrogen-in-oxygen detection module is further connected to the oxygen discharge end of the oxygen side separation device 200 for discharging the oxygen, and an eighth switch valve S8 is provided on the pipeline connecting the second gas-liquid separator 301 and the oxygen discharge end.

[0111] Specifically, since the dynamic change rate of hydrogen in oxygen is very slow, after switching the electrolyzer 100 whose hydrogen content in oxygen is to be detected, it is necessary to ensure that the hydrogen content in oxygen reaches a steady state again before the operating state of the electrolyzer 100 can be determined. In order to increase the speed of reaching a steady state and improve the inspection rate, in this optional embodiment, a gas pipeline is led out at the outlet of the oxygen side separation device 200. By controlling the opening and closing of the eighth switch valve S8, it can be controlled whether part of the discharged oxygen is passed into the second gas-liquid separator 301 at a certain flow rate. After the oxygen discharged from the oxygen side separation device 200 is introduced, the gas flow rate in the second gas-liquid separator 301 increases, and the time for HTO to reach a steady state will be significantly shortened.

[0112] It should be noted that, although the oxygen introduced into the second gas-liquid separator 301 is not absolutely pure oxygen, the oxygen purity and flow rate can be detected by means of equipment such as an oxygen-hydrogen analyzer 305 arranged at the outlet of the oxygen-side separation device 200. The hydrogen content in oxygen detected by the hydrogen-in-oxygen detection device 300 can be corrected by the purity and flow rate of the oxygen discharged from the oxygen-side separation device 200 to obtain the actual hydrogen content in oxygen of the corresponding electrolytic cell 100. This correction process is a conventional technical means in the field and will not be repeated here.

[0113] It should be noted that the switch valve in this embodiment can be an electrically controlled switch valve such as a pneumatic ball valve, or a self-controlled switch valve such as a diaphragm regulating valve can be used to simplify the control based on the needs of automatic control. Those skilled in the art can set it according to actual needs. For the control of the switch valve, the liquid level transmitter 311 and other detection equipment and other equipment in the hydrogen production system, the system built-in controller can be used to control the operation, or it can be electrically connected to an external controller to realize the operation control of the switch valve and each device through the external controller. Those skilled in the art can generate the control logic and control program of the controller based on the above-mentioned inventive concept disclosed in this application and the prior art, which is a conventional technical means in this field and will not be repeated here.

[0114] Based on the same principle, this embodiment also discloses a method for detecting hydrogen in oxygen based on an alkaline water electrolysis hydrogen production system. The alkaline water electrolysis hydrogen production system includes a plurality of electrolyzers 100, an oxygen-side separation device 200, and an oxygen-hydrogen detection device 300; the oxygen-side separation device 200 is connected to the plurality of electrolyzers 100, and oxygen is separated from the gas-liquid mixture formed by the electrolysis of water in the electrolyzer 100, and the alkaline solution obtained in the process of separating oxygen is discharged back to the plurality of electrolyzers 100; the oxygen-hydrogen detection device 300 is connected to the plurality of electrolyzers 100, and is used to detect the content of hydrogen in oxygen of the gas-liquid mixture formed by each of the electrolyzers 100; the oxygen-hydrogen detection device 300 includes an alkaline solution storage device 306, which is used to store the alkaline solution separated in the process of detecting the content of hydrogen in oxygen of the gas-liquid mixture, and the alkaline solution storage device 306 is directly or indirectly connected to the plurality of electrolyzers 100.

[0115] The method comprises:

[0116] S110: The hydrogen content in oxygen of the gas-liquid mixture formed in each of the electrolytic cells 100 is detected by the hydrogen-in-oxygen detection device 300 .

[0117] S120 : When a preset condition is reached, the alkali solution stored in the alkali solution storage 306 is discharged to the plurality of electrolytic cells 100 .

[0118] In an optional embodiment, when a preset condition is reached, the step S120 of discharging the alkali solution stored in the alkali solution storage 306 to the plurality of electrolytic cells 100 includes:

[0119] S121 : When the alkali solution capacity in the oxygen-side separation device 200 is reduced to a preset limit or reaches a preset time condition, the alkali solution stored in the alkali solution storage 306 is discharged to the multiple electrolytic cells 100 .

[0120] In an optional embodiment, the hydrogen-in-oxygen detection device 300 includes at least one hydrogen-in-oxygen detection module and at least one alkali solution storage 306, and each of the hydrogen-in-oxygen detection modules is connected to at least one of the electrolytic cells 100;

[0121] When one oxygen-hydrogen detection module is connected to a plurality of the electrolyzers 100, a third switch valve S3 is provided on the connecting pipe between the one oxygen-hydrogen detection module and each corresponding electrolyzer 100;

[0122] The method further comprises:

[0123] S300: sequentially controlling one of the third switch valves S3 to open and the other third switch valves S3 to close, and obtaining the hydrogen content in oxygen detected by the hydrogen-in-oxygen detection module corresponding to the third switch valve S3 in the open state.

[0124] In an optional embodiment, the hydrogen-in-oxygen detection module further includes a nitrogen purge assembly;

[0125] The nitrogen purge assembly includes a nitrogen tank 310 connected to the second gas-liquid separator 301 and a sixth switch valve S6 disposed between the nitrogen tank 310 and the second gas-liquid separator 301;

[0126] The method comprises:

[0127] S410: Control all the third switch valves S3 to close, and the sixth switch valve S6 to open, and use the nitrogen tank 310 of the nitrogen purge assembly to output nitrogen to purge the gas in the second gas-liquid separator 301.

[0128] S420: After the predetermined purge condition is reached, the sixth switch valve S6 is closed.

[0129] In an optional embodiment, the second gas-liquid separator 301 of the oxygen-hydrogen detection module is further connected to the oxygen discharge end of the oxygen side separation device 200 for discharging the oxygen, and an eighth switch valve S8 is provided on the pipeline connecting the second gas-liquid separator 301 and the oxygen discharge end;

[0130] The method comprises:

[0131] S510: Control one of the third switch valves S3 to open, and after the other third switch valves S3 are closed, control the eighth switch valve S8 to open, so as to input the oxygen discharged from the oxygen side separation device 200 into the second gas-liquid separator 301 .

[0132] S520: Obtaining the hydrogen content in oxygen detected by the hydrogen-in-oxygen detection module corresponding to the third switch valve S3 in the open state, and correcting the hydrogen content in oxygen based on the flow rate of oxygen discharged from the oxygen-side separation device 200.

[0133] Since the principle of solving the problem by the method for detecting hydrogen in oxygen is similar to that of the above alkaline water electrolysis hydrogen production system, the implementation of the method for detecting hydrogen in oxygen can refer to the implementation of the alkaline water electrolysis hydrogen production system, which will not be repeated here.

[0134] Based on the same principle, Figure 5 As shown, this embodiment also discloses a controller, which is applied to an alkaline water electrolysis hydrogen production system, wherein the alkaline water electrolysis hydrogen production system includes a plurality of electrolytic cells 100, an oxygen side separation device 200, and an oxygen-hydrogen detection device 300;

[0135] The oxygen-side separation device 200 is in communication with the multiple electrolytic cells 100, and separates oxygen from the gas-liquid mixture formed by electrolyzing water in the electrolytic cells 100, and discharges the alkaline solution obtained in the process of separating oxygen back to the multiple electrolytic cells 100; the oxygen-hydrogen detection device 300 is in communication with the multiple electrolytic cells 100, and is used to detect the hydrogen content in the oxygen of the gas-liquid mixture formed by each of the electrolytic cells 100; the oxygen-hydrogen detection device 300 includes an alkaline solution storage device 306, which is used to store the alkaline solution separated in the process of detecting the hydrogen content in the oxygen of the gas-liquid mixture, and the alkaline solution storage device 306 is directly or indirectly connected to the multiple electrolytic cells 100;

[0136] The controller comprises a detection control module 11 and an alkali solution circulation control module 12 .

[0137] The detection control module 11 is used to detect the hydrogen content in oxygen of the gas-liquid mixture formed by each of the electrolytic cells 100 through the hydrogen-in-oxygen detection device 300 .

[0138] The alkali solution circulation control module 12 is used to discharge the alkali solution stored in the alkali solution storage 306 to the multiple electrolytic cells 100 when a preset condition is reached.

[0139] Since the principle of solving the problem by the controller is similar to that of the above alkaline water electrolysis hydrogen production system, the implementation of the controller can refer to the implementation of the alkaline water electrolysis hydrogen production system, and will not be repeated here.

[0140] Based on the same principle, this embodiment also discloses a hydrogen in oxygen detection system based on an alkaline water electrolysis hydrogen production system. The system includes the alkaline water electrolysis hydrogen production system and a controller described in this embodiment.

[0141] Since the principle of solving the problem by the hydrogen in oxygen detection system is similar to that of the alkaline water electrolysis hydrogen production system, the implementation of the hydrogen in oxygen detection system can refer to the implementation of the alkaline water electrolysis hydrogen production system, which will not be repeated here.

[0142] An embodiment of the present application also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above method when executing the computer program.

[0143] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program implements the above method when executed by a processor.

[0144] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer programs to produce the systems, devices, modules or units described in the above embodiments, which can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer device, and specifically, the computer device can be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0145] In a typical example, the computer device specifically includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the method executed by the client as described above is implemented; or, when the processor executes the program, the method executed by the server as described above is implemented.

[0146] The computer equipment of the present application embodiment includes a central processing unit (CPU), which can perform various appropriate work and processing according to the program stored in the read-only memory (ROM) or the program loaded from the storage part into the random access memory (RAM). In the RAM, various programs and data required for system operation are also stored. The CPU, ROM, and RAM are connected to each other through a bus. The input / output (I / O) interface is also connected to the bus.

[0147] The following components are connected to the I / O interface: an input section including a keyboard, a mouse, etc.; an output section including a cathode ray tube (CRT), a liquid crystal feedback device (LCD), etc., and a speaker, etc.; a storage section including a hard disk, etc.; and a communication section including a network interface card such as a LAN card, a modem, etc. The communication section performs communication processing via a network such as the Internet. A drive is also connected to the I / O interface as needed. Removable media, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., are installed on the drive as needed so that a computer program read therefrom is installed as needed as a storage section.

[0148] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program tangibly contained on a machine-readable medium, and the computer program includes program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication part, and / or installed from a removable medium.

[0149] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0150] For the convenience of description, the above device is described in various units according to their functions. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0151] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0152] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0153] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0154] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0155] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0156] The present application may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0157] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0158] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An alkaline water electrolysis hydrogen production system, characterized in that: It includes a plurality of electrolytic cells, an oxygen side separation device and an oxygen-hydrogen detection device; The oxygen-side separation device is in communication with the plurality of electrolytic cells, separates oxygen from the gas-liquid mixture formed by electrolyzing water in the electrolytic cells, and discharges the alkaline solution obtained in the process of separating oxygen back to the plurality of electrolytic cells; The hydrogen-in-oxygen detection device is in communication with the plurality of electrolytic cells and is used to detect the hydrogen content in the oxygen of the gas-liquid mixture formed by each of the electrolytic cells; The hydrogen-in-oxygen detection device comprises an alkali solution storage device for storing the alkali solution separated during the process of detecting the hydrogen content in oxygen of the gas-liquid mixture, and the alkali solution storage device is directly or indirectly connected to the plurality of electrolytic cells.

2. The alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: The oxygen side separation device comprises a first gas-liquid separator, a first scrubber, a first condenser, a first gas-water separator and a first water collector which are sequentially connected through pipelines; The first gas-liquid separator is in communication with the plurality of electrolytic cells, receives the gas-liquid mixture formed by electrolyzing water in the electrolytic cells, and discharges the alkaline solution obtained in the process of separating oxygen back to the plurality of electrolytic cells; A first switch valve is provided on the pipeline connecting the first gas-water separator and the first water collector; The first water collector comprises an oxygen-side sewage outlet, the oxygen-side sewage outlet is connected to a sewage pipe, and a second switch valve is arranged on the sewage pipe.

3. The alkaline water electrolysis hydrogen production system according to claim 1, characterized in that: The hydrogen-in-oxygen detection device comprises at least one hydrogen-in-oxygen detection module and at least one alkali solution storage device, and each of the hydrogen-in-oxygen detection modules is connected to at least one of the electrolytic cells; When one hydrogen-in-oxygen detection module is connected to a plurality of the electrolytic cells, a third switch valve is provided on the connecting pipe between the one hydrogen-in-oxygen detection module and each corresponding electrolytic cell.

4. The alkaline water electrolysis hydrogen production system according to claim 3, characterized in that: The oxygen-hydrogen detection module comprises a second gas-liquid separator, a second scrubber, a second condenser, a second gas-water separator and an oxygen-hydrogen analyzer which are connected in sequence, each of the alkali liquid storage devices is connected to at least one of the second gas-liquid separators, and a fourth switch valve is provided on the pipeline connecting the alkali liquid storage device and the second gas-liquid separator; The second gas-liquid separator is in communication with the corresponding electrolytic cell; The alkali solution storage is connected to at least one of the electrolytic cell and / or the oxygen side separation device, and a fifth switch valve is arranged on the pipeline connecting the alkali solution storage and the corresponding electrolytic cell and / or the oxygen side separation device.

5. The alkaline water electrolysis hydrogen production system according to claim 4, characterized in that: The hydrogen in oxygen detection module also includes a water replenishment pump; The water replenishment pump is arranged on a pipeline connecting the alkali solution storage device and the multiple electrolytic cells and / or the oxygen side separation device, and is used to transport the alkali solution in the alkali solution storage device to the correspondingly connected electrolytic cells and / or the oxygen side separation device.

6. The alkaline water electrolysis hydrogen production system according to claim 4, characterized in that: The hydrogen in oxygen detection module also includes a nitrogen purge component; The nitrogen purge assembly includes a nitrogen tank connected to the second gas-liquid separator and a sixth switch valve arranged between the nitrogen tank and the second gas-liquid separator.

7. The alkaline water electrolysis hydrogen production system according to claim 4, characterized in that: The hydrogen-in-oxygen detection module further includes an exhaust pipe connected to the second gas-water separator and the hydrogen-in-oxygen analyzer; The exhaust pipe is provided with a seventh switch valve.

8. The alkaline water electrolysis hydrogen production system according to claim 4, characterized in that: The second gas-liquid separator of the hydrogen-in-oxygen detection module is further connected to the oxygen discharge end of the oxygen-side separation device for discharging the oxygen, and an eighth switch valve is provided on the pipeline connecting the second gas-liquid separator and the oxygen discharge end.

9. A method for detecting hydrogen in oxygen based on an alkaline water electrolysis hydrogen production system, characterized in that: The alkaline water electrolysis hydrogen production system comprises a plurality of electrolytic cells, an oxygen side separation device and an oxygen-hydrogen detection device; The oxygen-side separation device is in communication with the multiple electrolytic cells, separates oxygen from the gas-liquid mixture formed by electrolyzing water in the electrolytic cells, and discharges the alkaline solution obtained in the process of separating oxygen back to the multiple electrolytic cells; the hydrogen-in-oxygen detection device is in communication with the multiple electrolytic cells, and is used to detect the hydrogen content in the oxygen of the gas-liquid mixture formed by each electrolytic cell; the hydrogen-in-oxygen detection device includes an alkaline solution storage device, which is used to store the alkaline solution separated in the process of detecting the hydrogen content in the oxygen of the gas-liquid mixture, and the alkaline solution storage device is directly or indirectly connected to the multiple electrolytic cells; The method comprises: Detecting the hydrogen content in oxygen of the gas-liquid mixture formed in each electrolytic cell by the hydrogen-in-oxygen detection device; When a preset condition is reached, the alkali solution stored in the alkali solution storage is discharged to the plurality of electrolytic cells.

10. The method for detecting hydrogen in oxygen according to claim 9, characterized in that: When the preset condition is reached, discharging the alkali solution stored in the alkali solution storage device to the plurality of electrolytic cells comprises: When the alkali solution capacity in the oxygen-side separation device decreases to a preset limit or reaches a preset time condition, the alkali solution stored in the alkali solution storage is discharged to the plurality of electrolytic cells.

11. The method for detecting hydrogen in oxygen according to claim 9, characterized in that: The hydrogen-in-oxygen detection device comprises at least one hydrogen-in-oxygen detection module and at least one alkali solution storage device, and each of the hydrogen-in-oxygen detection modules is connected to at least one of the electrolytic cells; When one oxygen-hydrogen detection module is connected to a plurality of the electrolytic cells, a third switch valve is provided on the connecting pipe between the one oxygen-hydrogen detection module and each corresponding electrolytic cell; The method further comprises: One of the third switch valves is controlled to open and the other third switch valves are controlled to close in sequence, and the hydrogen content in oxygen detected by the hydrogen-in-oxygen detection module corresponding to the third switch valve in the open state is obtained.

12. The method for detecting hydrogen in oxygen according to claim 11, characterized in that: The hydrogen in oxygen detection module also includes a nitrogen purge component; The nitrogen purge assembly includes a nitrogen tank connected to the second gas-liquid separator and a sixth switch valve arranged between the nitrogen tank and the second gas-liquid separator; The method comprises: Control all the third switch valves to close, the sixth switch valve to open, and use the nitrogen tank of the nitrogen purge assembly to output nitrogen to purge the gas in the second gas-liquid separator; After the predetermined purge condition is reached, the sixth switch valve is closed.

13. The method for detecting hydrogen in oxygen according to claim 11, characterized in that: The second gas-liquid separator of the hydrogen-in-oxygen detection module is further connected to the oxygen discharge end of the oxygen-side separation device for discharging the oxygen, and an eighth switch valve is provided on the pipeline connecting the second gas-liquid separator and the oxygen discharge end; The method comprises: Controlling one of the third switch valves among all the third switch valves to open, and after the other third switch valves are closed, controlling the eighth switch valve to open, so as to input the oxygen discharged from the oxygen side separation device into the second gas-liquid separator; The hydrogen content in oxygen detected by the hydrogen-in-oxygen detection module corresponding to the third switch valve in the open state is obtained, and the hydrogen content in oxygen is corrected based on the flow rate of oxygen discharged from the oxygen-side separation device.

14. A controller, characterized in that: Applicable to an alkaline water electrolysis hydrogen production system, the alkaline water electrolysis hydrogen production system comprising a plurality of electrolytic cells, an oxygen side separation device and an oxygen-hydrogen detection device; The oxygen-side separation device is in communication with the multiple electrolytic cells, separates oxygen from the gas-liquid mixture formed by electrolyzing water in the electrolytic cells, and discharges the alkaline solution obtained in the process of separating oxygen back to the multiple electrolytic cells; the hydrogen-in-oxygen detection device is in communication with the multiple electrolytic cells, and is used to detect the hydrogen content in the oxygen of the gas-liquid mixture formed by each electrolytic cell; the hydrogen-in-oxygen detection device includes an alkaline solution storage device, which is used to store the alkaline solution separated in the process of detecting the hydrogen content in the oxygen of the gas-liquid mixture, and the alkaline solution storage device is directly or indirectly connected to the multiple electrolytic cells; The controller comprises: A detection control module, used for detecting the hydrogen content in oxygen of the gas-liquid mixture formed by each of the electrolytic cells through the hydrogen-in-oxygen detection device; The alkali solution circulation control module is used to discharge the alkali solution stored in the alkali solution storage to the multiple electrolytic cells when a preset condition is reached.

15. A hydrogen in oxygen detection system based on an alkaline water electrolysis hydrogen production system, characterized in that: It comprises the alkaline water electrolysis hydrogen production system as described in any one of claims 1 to 8 and the controller as described in claim 14.

16. A terminal device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 9 to 13 is implemented.

17. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 9 to 13 is implemented.

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