Electrolytic hydrogen production system and its water discharge control method

Abstract

The embodiment of the application discloses an electrolytic hydrogen production system and a drainage control method thereof, and relates to the technical field of electrolytic hydrogen production. The electrolytic hydrogen production system comprises a preparation device, a hydrogen separator, a drainage assembly and a controller. The gas inlet end of the hydrogen separator is connected with the hydrogen discharge end of the preparation device through a pipeline. The drainage assembly comprises a liquid pumping device, a storage container, a first connecting pipe and a second connecting pipe. The first connecting pipe connects the drainage end of the hydrogen separator and the input end of the liquid pumping device. The second connecting pipe connects the output end of the liquid pumping device and the water inlet end of the storage container. The controller controls the operating power of the liquid pumping device based on the operating condition parameters of the electrolytic hydrogen production system. The technical scheme provided by the embodiment of the application aims to realize stable pressure drainage of the hydrogen separator and improve the stability and safety performance of the electrolytic hydrogen production system.

Description

Technical Field

[0001] The embodiments in this application relate to the field of electrolytic hydrogen production technology, and in particular to an electrolytic hydrogen production method and its wastewater control method. Background Technology

[0002] In related technologies, the hydrogen produced by the preparation device of the electrolytic hydrogen production system is mostly mixed with certain impurities such as water and alkali. Usually, the produced hydrogen can be transported to a hydrogen separator through pipelines to perform certain gas-liquid separation treatment in the hydrogen separator, reduce the impurities mixed in the hydrogen, and ensure the purified gas output of the electrolytic hydrogen production system.

[0003] However, current hydrogen separators are prone to internal pressure instability during operation, which causes fluctuations in the hydrogen-oxygen pressure difference of the electrolytic hydrogen production system, reducing the stability of the electrolytic hydrogen production system. Summary of the Invention

[0004] Several embodiments in this application propose an electrolytic hydrogen production system, which aims to achieve stable drainage of the hydrogen separator and improve the stability and safety performance of the electrolytic hydrogen production system.

[0005] An embodiment of this application proposes an electrolytic hydrogen production system including a preparation device, a hydrogen separator, a drainage assembly, and a controller. The inlet of the hydrogen separator is connected to the hydrogen outlet of the preparation device. The drainage assembly includes a pumping device, a storage container, a first connecting pipe, and a second connecting pipe. The first connecting pipe connects the drainage end of the hydrogen separator to the input end of the pumping device, and the second connecting pipe connects the output end of the pumping device to the inlet of the storage container. The controller adjusts the operating power of the pumping device based on the operating parameters of the electrolytic hydrogen production system.

[0006] In one embodiment, the drainage assembly further includes a third connecting pipe and a fourth connecting pipe, the third connecting pipe being connected to the drainage end of the storage container and the input end of the liquid extraction device, and the fourth connecting pipe being connected to the output end of the liquid extraction device.

[0007] In one embodiment, the first connecting pipe is provided with a first control valve, the second connecting pipe is provided with a second control valve, the third connecting pipe is provided with a third control valve, and the fourth connecting pipe is provided with a fourth control valve.

[0008] In one embodiment, the input end of the liquid extraction device is connected to a first three-way valve, and the first connecting pipe and the third connecting pipe are respectively connected to the two input ends of the first three-way valve; the output end of the liquid extraction device is connected to a second three-way valve, and the second connecting pipe and the fourth connecting pipe are respectively connected to the two input ends of the second three-way valve.

[0009] In one embodiment, the storage container is a flash evaporator.

[0010] An embodiment of this application also proposes a drainage control method for an electrolytic hydrogen production system, applied to the electrolytic hydrogen production system as described above, characterized in that the drainage control method for the electrolytic hydrogen production system includes:

[0011] Start the liquid extraction device to draw out the liquid from the hydrogen separator.

[0012] The first operating condition information of the preparation device and the second operating condition information of the hydrogen separator are detected, and a first control signal is obtained based on the first operating condition information and the second operating condition information.

[0013] The operating power of the pumping device is adjusted according to the first control signal to regulate the flow rate of the liquid in the first connecting pipe.

[0014] In one embodiment, the step of detecting the first operating condition information of the preparation apparatus and the second operating condition information of the hydrogen separator, and obtaining the first control signal based on the first and second operating condition information, includes:

[0015] The hydrogen production information of the preparation device is detected and acquired, and the first operating condition information is formed based on the hydrogen production information of the preparation device;

[0016] The working pressure, standard pressure, and working temperature inside the hydrogen separator are detected and obtained, and a second operating condition information is generated based on the working pressure, standard pressure, and working temperature inside the hydrogen separator.

[0017] The drainage rate of the hydrogen separator is calculated based on the first operating condition information and the second operating condition information, and the first control signal is obtained based on the drainage rate.

[0018] In one embodiment, prior to the step of controlling the start of the liquid extraction device, the method further includes:

[0019] Detect the liquid level information inside the hydrogen separator;

[0020] If the liquid level in the hydrogen separator is greater than or equal to the first threshold, a signal to drain the liquid is sent to the pumping device.

[0021] In one embodiment, after the step of adjusting the operating power of the pumping device according to the first control signal to regulate the flow rate of the liquid in the first connecting pipe, the method further includes:

[0022] Detect the liquid level information inside the hydrogen separator;

[0023] If the liquid level in the hydrogen separator is less than or equal to the second threshold, a stop drainage signal is sent to the pumping device.

[0024] In one embodiment, after the step of sending a stop drainage signal to the pumping device if the liquid level in the storage container is less than or equal to a second threshold, the method further includes:

[0025] Control the start of the liquid extraction device to draw out and discharge the liquid from the storage container;

[0026] The hydrogen production information of the preparation device and the liquid level information of the hydrogen separator are detected and obtained, and the drainage time is set according to the hydrogen production information and the liquid level information.

[0027] The liquid level in the storage container is detected, and a second control signal is obtained based on the liquid level and the set drainage time. The operating power of the liquid pumping device is adjusted according to the second control signal.

[0028] In the various embodiments provided in this application, a liquid extraction device is used to extract liquid from the hydrogen separator and collect it into a storage container. This allows the controller to adjust the operating power of the extraction device according to the operating parameters of the electrolytic hydrogen production system. For example, the operating power of the extraction device can be adjusted according to data such as the hydrogen production of the preparation device and the working pressure required to be maintained in the hydrogen separator. This enables control of the flow rate and volume of the liquid extracted by the extraction device, which in turn controls the drainage speed of the hydrogen separator. This achieves stable drainage of the hydrogen separator, which helps prevent the gas phase space in the hydrogen separator from increasing or changing abruptly, reduces the gas pressure changes in the hydrogen separator, and thus effectively reduces the fluctuation of the hydrogen-oxygen side pressure difference in the electrolytic hydrogen production system, improving the stability and reliability of the electrolytic hydrogen production system. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments or prior art of this application, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of an embodiment of the electrolytic hydrogen production system provided in this application;

[0031] Figure 2 This is a schematic diagram of another embodiment of the electrolytic hydrogen production system provided in this application;

[0032] Figure 3 A schematic flowchart of an embodiment of the drainage control method for the electrolytic hydrogen production system provided in this application;

[0033] Figure 4 for Figure 3 A detailed flowchart of an embodiment of step S20;

[0034] Figure 5 A schematic flowchart of another embodiment of the drainage control method for the electrolytic hydrogen production system provided in this application;

[0035] Figure 6 A schematic flowchart of another embodiment of the drainage control method for the electrolytic hydrogen production system provided in this application;

[0036] Figure 7 This is a schematic flowchart of another embodiment of the drainage control method for the electrolytic hydrogen production system provided in this application.

[0037] Explanation of icon numbers:

[0038] 100. Electrolytic hydrogen production system; 10. Preparation apparatus; 30. Hydrogen separator; 50. Drainage assembly; 51. Liquid pumping device; 511. First three-way valve; 513. Second three-way valve; 52. Storage container; 53. First connecting pipe; 531. First control valve; 54. Second connecting pipe; 541. Second control valve; 55. Third connecting pipe; 551. Third control valve; 56. Fourth connecting pipe; 561. Fourth control valve; 70. Controller. Detailed Implementation

[0039] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of several embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0040] It should be noted that if directional indications (such as up, down, left, right, front, back, etc.) are involved in multiple embodiments of this application, the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0041] Furthermore, if multiple embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0042] In related technologies, the gases generated by the electrolytic hydrogen production system often contain impurities such as water and alkali. Typically, the generated gases are piped to a gas-liquid separator to perform gas-liquid separation, reducing impurities and ensuring purified gas output from the electrolytic hydrogen production system. However, after a period of operation, the separated liquid needs to be discharged from the hydrogen separator. Currently, the discharge process affects the internal gas pressure, potentially causing significant fluctuations in the hydrogen-oxygen pressure difference, thus reducing the system's stability.

[0043] Understandably, most current gas-liquid separators have a regulating valve installed on the pipe connected to the drain end of the gas-liquid separator. By controlling the opening of the regulating valve, the liquid collected in the gas-liquid separator can be discharged into the storage container through the pipe, thus avoiding the possibility that the liquid level in the gas-liquid separator is too high and will affect the operation of the gas-liquid separator.

[0044] However, the large pressure difference between the gas-liquid separator and the storage container leads to a high flow rate in the pipes when draining from the gas-liquid separator, causing a rapid drop in the liquid level within the separator. This can easily cause an increase or abrupt change in the volume of the gas phase space within the hydrogen separator, affecting the hydrogen pressure and consequently resulting in significant fluctuations in the pressure difference between the output hydrogen and oxygen from the electrolytic hydrogen production system. This reduces the operational stability and reliability of the electrolytic hydrogen production system. Furthermore, pressure changes within the hydrogen separator can negatively impact its lifespan, posing certain safety hazards to the electrolytic hydrogen production system. To address these issues, this application proposes an electrolytic hydrogen production system 100.

[0045] Please see Figure 1 and Figure 2In one embodiment of this application, the electrolytic hydrogen production system 100 includes a preparation device 10, a hydrogen separator 30, a drainage assembly 50, and a controller 70. The inlet end of the hydrogen separator 30 is connected to the hydrogen outlet end of the preparation device 10. The drainage assembly 50 includes a pumping device 51, a storage container 52, a first connecting pipe 53, and a second connecting pipe 54. The first connecting pipe 53 connects the drainage end of the hydrogen separator 30 and the input end of the pumping device 51. The second connecting pipe 54 connects the output end of the pumping device 51 and the inlet end of the storage container 52. The controller 70 adjusts the operating power of the pumping device 51 based on the operating parameters of the electrolytic hydrogen production system 100.

[0046] The preparation device 10 can be used to electrolyze and generate hydrogen and oxygen. This device 10 can be an electrolytic cell structure, where electrode plates are arranged and installed inside the cell to electrolyze the electrolyte solution and generate a certain amount of gas. Alternatively, the preparation device 10 can be any other device capable of electrolyzing and generating hydrogen and oxygen; this application does not limit the type of preparation device 10. The preparation device 10 can have a hydrogen outlet for the generated hydrogen and an oxygen outlet for the generated oxygen. A pipeline connects the hydrogen outlet of the preparation device 10 to the inlet of the hydrogen separator 30, allowing the hydrogen generated by the preparation device 10 to be stably delivered to the hydrogen separator 30 for gas-liquid separation.

[0047] When gas is introduced into the hydrogen separator 30, the gas can be separated from the liquid it carries by gravity in the hydrogen separator 30, or the gas can be separated from the liquid it carries by centrifugal force in the hydrogen separator 30. Since the principle of separating gas and liquid in the hydrogen separator 30 is existing technology, this application will not describe the specific structural design of the hydrogen separator 30 in detail.

[0048] The hydrogen separator 30 can temporarily store the separated liquid in its inner cavity, while the separated hydrogen is transported through the exhaust end of the hydrogen separator 30 to other purification equipment in the electrolytic hydrogen production system 100 for further purification.

[0049] By connecting the input end of the pumping device 51 and the drain end of the hydrogen separator 30 through the first connecting pipe 53, and connecting the output end of the pumping device 51 and the inlet end of the storage container 52 through the second connecting pipe 54, when the liquid stored in the hydrogen separator 30 reaches a certain liquid level, the pumping device 51 can extract the liquid from the hydrogen separator 30 and transport it through the first connecting pipe 53 and the second connecting pipe 54 to the storage container 52, so that the gas phase space and the liquid phase space in the hydrogen separator 30 can maintain a certain relatively stable state.

[0050] The controller 70 can be wired to the hydrogen production system 100, including the preparation device 10, hydrogen separator 30, and liquid extraction device 51, to ensure stable operation. This allows the controller 70 to reliably receive operating information from the hydrogen production system 100 and to reliably control each device, guaranteeing stable operation. Alternatively, the controller 70 can receive and transmit electrical signals. Operating information from the hydrogen production system 100 can be transmitted to the controller via electrical signals, and control signals from the controller 70 can be transmitted to each device via electrical signals, ensuring stable operation of the hydrogen production system 100. The liquid extraction device 51 can be a variable frequency pump, centrifugal pump, gear pump, etc. The flow rate of the liquid extracted by the pumping device 51 can be controlled by adjusting its operating power, thus regulating the flow rate and volume within the first connecting pipe 53. Furthermore, the electrolytic hydrogen production system 100 can acquire information such as the hydrogen production rate of the preparation device 10 and the required working pressure within the hydrogen separator 30 during operation. Based on this information, the controller 70 adjusts the operating power of the pumping device 51 accordingly, thereby controlling the flow rate and volume of the liquid in the first connecting pipe 53. This means that the drainage speed of the hydrogen separator 30 can be controlled by adjusting the operating power of the pumping device 51, enabling the drainage component 50 to achieve a certain pressure stabilization effect on the hydrogen separator 30. This prevents excessively fast drainage from causing abrupt changes in the gas phase space within the hydrogen separator 30, resulting in a more constant overall pressure. This improves the structural stability and service life of the hydrogen separator 30, ensuring that the gas within the hydrogen separator 30 can be separated and purified under a relatively stable pressure environment. This reduces fluctuations in the hydrogen-oxygen pressure difference of the electrolytic hydrogen production system 100, effectively improving its stability and reliability. The liquid extraction device 51 can also be a plunger pump, etc. This application does not limit the specific structure of the liquid extraction device 51, as long as it can achieve a certain liquid extraction function and a certain power adjustment function. The storage container 52 can be a liquid storage tank, liquid storage bottle, or flash tank, etc., as long as it can be a container with a certain liquid storage space, this application does not limit it.

[0051] In one embodiment of this application, by using a liquid extraction device 51 to extract liquid from the hydrogen separator 30 and collect it into a storage container 52, the controller 70 can adjust the operating power of the liquid extraction device 51 according to the operating parameters of the electrolytic hydrogen production system 100. For example, the operating power of the liquid extraction device 51 can be adjusted according to data such as the hydrogen production of the preparation device 10 and the working pressure required to be maintained in the hydrogen separator 30, thereby controlling the flow rate and flow rate of the liquid extracted by the liquid extraction device 51. In other words, the drainage speed of the hydrogen separator 30 can be controlled, achieving stable drainage of the hydrogen separator 30. This helps to prevent the gas phase space in the hydrogen separator 30 from increasing or changing abruptly, reducing the gas pressure change in the hydrogen separator 30, and thus effectively reducing the fluctuation of the hydrogen-oxygen side pressure difference in the electrolytic hydrogen production system 100, improving the stability and reliability of the electrolytic hydrogen production system 100.

[0052] See Figure 1 and Figure 2 In one embodiment of this application, the drainage assembly 50 further includes a third connecting pipe 55 and a fourth connecting pipe 56. The third connecting pipe 55 is connected to the drainage end of the storage container 52 and the input end of the pumping device 51, and the fourth connecting pipe 56 is connected to the output end of the pumping device 51.

[0053] In this embodiment, the input end of the liquid extraction device 51 and the drain end of the storage container 52 are connected by a third connecting pipe 55, and the output end of the liquid extraction device 51 is connected by a fourth connecting pipe 56. This allows the extraction device to extract and discharge the collected liquid from the storage container 52, preventing overload of the storage container 52 and further improving the system stability and reliability of the electrolytic hydrogen production system 100. Alternatively, the liquid extraction device 51 can have two independent extraction systems built-in, or valves can be installed on the pipes connecting the input and output ends of the liquid extraction device 51. This allows the liquid extraction device 51 to not only extract liquid from the hydrogen separator 30 and transport it to the storage container 52 via the first connecting pipe 53 and the second connecting pipe 54, but also to extract liquid from the storage container 52 and discharge it via the third connecting pipe 55 and the fourth connecting pipe 56, effectively improving the practicality of the drainage assembly 50. The fourth connecting pipe 56 can be connected to the preparation device 10, so that the water, alkali solution, etc. collected in the storage container 52 can be returned to the preparation device 10 for further electrolysis, thereby making full use of the electrolytic solution; or, the fourth connecting pipe 56 can be connected to other containers or devices, so that the liquid collected in the storage container 52 can be used for other purposes.

[0054] See Figure 1In one embodiment of this application, a first control valve 531 is provided on the first connecting pipe 53, a second control valve 541 is provided on the second connecting pipe 54, a third control valve 551 is provided on the third connecting pipe 55, and a fourth control valve 561 is provided on the fourth connecting pipe 56.

[0055] In this embodiment, by setting control valves on each connecting pipe of the drainage assembly 50, the opening and closing of the corresponding connecting pipes can be adjusted by operating the control valves to switch the pumping direction of the pumping device 51. That is, by controlling the first control valve 531 and the second control valve 541 to open and the third control valve 551 and the fourth control valve 561 to close, the first connecting pipe 53 and the second connecting pipe 54 are connected, and the third connecting pipe 55 and the fourth connecting pipe 56 are disconnected, so that the pumping device 51 can pump the liquid in the hydrogen separator 30 and transport it to the storage container 52 through the first connecting pipe 53 and the second connecting pipe 54; or, by controlling the first control valve 531 and the second control valve 541 to close and the third control valve 551 and the fourth control valve 561 to open, the first connecting pipe 53 and the second connecting pipe 54 are disconnected, and the third connecting pipe 55 and the fourth connecting pipe 56 are connected, so that the pumping device 51 can pump and discharge the liquid collected in the storage container 52. The control valve in the drainage assembly 50 can be adjusted to switch between draining the hydrogen separator 30 and draining the storage container 52 by the pumping device 51. This simplifies the structural design of the drainage assembly 50 and further improves the operational convenience of the electrolytic hydrogen production system 100. The control valves on each connecting pipe can be electrically or signal-connected to the controller 70, allowing for better automated control of the electrolytic hydrogen production system via the controller 70. Alternatively, the control valves can be manually operated; this application does not limit the method of operation for the control valves.

[0056] See Figure 2 In one embodiment of this application, the input end of the liquid extraction device 51 is connected to a first three-way valve 511, and a first connecting pipe 53 and a third connecting pipe 55 are respectively connected to the two input ends of the first three-way valve 511. The output end of the liquid extraction device 51 is connected to a second three-way valve 513, and a second connecting pipe 54 and a fourth connecting pipe 56 are respectively connected to the two input ends of the second three-way valve 513.

[0057] In this embodiment, the drainage assembly 50 can also be equipped with a first three-way valve 511 and a second three-way valve 513 at the input and output ends of the pumping device 51, respectively. These first three-way valves 511 and 513 can be three-way valves capable of changing the flow direction in the pipeline. Furthermore, by adjusting the valves of the first three-way valves 511 and 513, the input direction of the pumping device can be changed. That is, by adjusting the first three-way valve 511, the first connecting pipe 53 can be connected to the input end of the pumping device, while the third connecting pipe 55 can be disconnected from the input end of the pumping device. Simultaneously, by adjusting the second three-way valve 513, the second connecting pipe can be connected. The first connecting pipe 54 is connected to the output end of the extraction device, and the fourth connecting pipe 56 is disconnected from the input end of the extraction device, so that the extraction device can extract the liquid in the hydrogen separator 30 and transport it to the storage container 52 through the first connecting pipe 53 and the second connecting pipe 54; or, by adjusting the first three-way valve 511, the third connecting pipe 55 is connected to the input end of the extraction device, and the first connecting pipe 53 is disconnected from the input end of the extraction device. At the same time, by adjusting the second three-way valve 513, the fourth connecting pipe 56 is connected to the output end of the extraction device, and the second connecting pipe 54 is disconnected from the input end of the extraction device, so that the liquid extraction device 51 can extract and discharge the liquid collected in the storage container 52. By adjusting the first three-way valve 511 and the second three-way valve 513 to change the connection direction of the input and output ends of the extraction device, it is easier to switch the liquid extraction device 51 to drain the hydrogen separator 30 or the storage container 52, which helps to simplify the structural design of the drainage component 50 and further improves the operational convenience of the electrolytic hydrogen production system 100.

[0058] Furthermore, in one embodiment of this application, the storage container 52 is a flash evaporator.

[0059] Understandably, by using equipment such as a flash tank for liquid storage in storage container 52, since the pressure inside the hydrogen separator 30 is higher than that inside the flash tank, when the pumping device 51 draws gas from the hydrogen separator 30 into storage container 52 for storage, the high-pressure fluid may experience a sudden pressure drop upon entering the flash tank, potentially causing the water in the fluid to evaporate and vaporize. This allows some of the water in the fluid to be separated, enabling storage container 52 to also function as a separator for impurities such as alkali and water. This allows storage container 52 to better store the alkali collected in the hydrogen separator 30, improving the utilization rate of the liquid stored in storage container 52, reducing subsequent waste liquid treatment processes, and further enhancing the practicality of drainage component 50.

[0060] In addition, in other embodiments, the storage container 52 may also be other devices capable of using pressure to perform a certain separation operation on the waste liquid, which is not limited in this application.

[0061] This invention provides a drainage control method for an electrolytic hydrogen production system 100, referring to... Figure 3 , Figure 3 This is a flowchart illustrating an embodiment of the drainage control method for an electrolytic hydrogen production system 100 of the present invention. This application provides an embodiment of the drainage control method for an electrolytic hydrogen production system 100. It should be noted that although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that shown here. The drainage control method for the electrolytic hydrogen production system 100 includes the following steps:

[0062] Step S10: Control the start of the liquid extraction device 51 so that the liquid extraction device 51 extracts the liquid in the hydrogen separation unit 30.

[0063] Understandably, after the hydrogen separator 30 of the electrolytic hydrogen production system 100 has been operating for a certain period of time, a certain amount of the separated mixed solution can be stored in the hydrogen separator 30. At this time, the liquid pumping device 51 can be started to pump the liquid in the hydrogen separator 30 and transport it to the storage container 52 through the first connecting pipe 53 and the second connecting pipe 54, so as to discharge a certain amount of waste liquid from the hydrogen separator 30. This allows the hydrogen separator 30 to maintain a certain internal cavity space to continuously perform gas-liquid separation operations, ensuring the stable operation of the electrolytic hydrogen production system 100. There are many ways to control the start and stop of the liquid extraction device 51. For example, the start and stop of the liquid extraction device 51 can be controlled according to the change of liquid level in the hydrogen separator 30, or the start and stop of the liquid extraction device 51 can be controlled according to a certain timing control program, or the start and stop of the liquid extraction device 51 can be controlled according to the change of pressure in the hydrogen separator 30. This application does not limit this, as long as the liquid extraction device 51 can be triggered to start under certain variable conditions, so as to effectively realize the automated control of the electrolytic hydrogen production system 100.

[0064] Step S20: Detect the first operating condition information of the preparation device 10 and the second operating condition information of the hydrogen separator 30, and obtain the first control signal based on the first operating condition information and the second operating condition information;

[0065] When discharging waste liquid from the hydrogen separator 30, hydrogen can be continuously input into the hydrogen separator 30. At this time, the waste liquid in the hydrogen separator 30 needs to be discharged at a certain flow rate to maintain a certain pressure environment within the hydrogen separator 30, preventing excessive pressure fluctuations in the discharged hydrogen after separation by the hydrogen separator 30, thereby preventing large fluctuations in the hydrogen-oxygen pressure difference of the electrolytic hydrogen production system 100. Therefore, when discharging waste liquid from the hydrogen separator 30, the system can detect and acquire first operating condition information, which may include, but is not limited to, the gas production rate, gas production volume, gas production temperature, and pressure, etc., and detect second operating condition information within the hydrogen separator 30, which may include, but is not limited to, the working pressure, working temperature, liquid level, etc., within the hydrogen separator 30. Based on the conditions required for the hydrogen separator 30 to maintain stable pressure operation, the controller 70 of the electrolytic hydrogen production system 100 can obtain a first control signal to control the operation of the pumping device 51 based on the first and second operating condition information.

[0066] Step S30: Adjust the operating power of the liquid extraction device 51 according to the first control signal to regulate the liquid flow rate in the first connecting pipe 53.

[0067] Furthermore, by regulating the operating power of the pumping device 51 according to the first control signal, the rate at which the pumping device 51 extracts the liquid flow can be controlled to a certain extent. This enables control of the liquid flow velocity in the first connecting pipe 53 and the second connecting pipe 54, allowing the discharge rate of the hydrogen separator 30 to be controlled based on the hydrogen production status of the preparation device 10 and environmental factors within the hydrogen separator 30. This avoids a rapid drop in the liquid level within the hydrogen separator 30, which could potentially lead to an increase or sudden change in the gas phase space within the hydrogen separator 30. As a result, the hydrogen separator 30 can maintain a relatively stable gas phase pressure environment during drainage, which helps to better reduce the gas pressure changes entering and exiting the hydrogen separator 30. This reduces the pressure difference fluctuations on the hydrogen-oxygen side of the electrolytic hydrogen production system 100, further improving the stability and reliability of the electrolytic hydrogen production system 100.

[0068] See Figure 4 In one embodiment of this application, the step of detecting the first operating condition information of the preparation apparatus 10 and the second operating condition information of the hydrogen separator 30, and obtaining the first control signal based on the first and second operating condition information, includes:

[0069] Step S21: Detect and acquire hydrogen production information of the preparation device 10, and form first operating condition information based on the hydrogen production information of the preparation device 10;

[0070] The preparation device 10 can be equipped with a sensor or other detection device to detect the gas output, so that the detection device can transmit the gas production information of the preparation device 10 to the controller 70 of the electrolysis hydrogen production system 100 in a timely manner. At this time, the pressure, temperature and gas production per unit time of the gas output by the preparation device 10 can be obtained from the gas production information. The controller 70 can form the first operating condition information based on the detected gas production information.

[0071] Step S22: Detect and acquire the working pressure, standard pressure and working temperature inside the hydrogen separator 30, and generate second working condition information based on the working pressure, standard pressure and working temperature inside the hydrogen separator 30.

[0072] The hydrogen separator 30 can be equipped with detection devices such as pressure transmitters, temperature transmitters, and liquid level detection devices. These detection devices can transmit information such as the working temperature and working pressure of the hydrogen separator 30 to the controller 70 of the electrolysis hydrogen production system 100 in a timely manner. Based on the detected working temperature, working pressure, and standard operating pressure of the hydrogen separator 30, the controller 70 can generate second operating condition information.

[0073] Step S23: Calculate the drainage rate of the hydrogen separator 30 based on the first operating condition information and the second operating condition information, and obtain the first control signal based on the drainage rate.

[0074] Understandably, the hydrogen separator 30 can discharge waste liquid at a certain drainage rate to prevent the liquid level inside the hydrogen separator 30 from dropping too quickly, reduce abrupt changes in the gas phase space inside the hydrogen separator 30, and achieve a pressure-stabilized drainage effect. At this time, based on the first and second operating condition information detected from the preparation apparatus 10 and the hydrogen separator 30, the maximum drainage rate of the hydrogen separator 30 can be calculated using the following formula:

[0075] V≤0.7×(Q / (P+P0))×(t+273.15) / 273.15

[0076] In the above formula, V represents the maximum drainage rate of the hydrogen separator 30, Q represents the standard hydrogen production rate in the preparation device 10, P is the working pressure inside the hydrogen separator 30, P0 represents the standard operating pressure inside the hydrogen separator 30, and t represents the working temperature inside the hydrogen separator 30.

[0077] Furthermore, the flow rates on the first connecting pipe 53 and the second connecting pipe 54 can be detected, and the feedback signal formed by comparing the detected flow rates with the drainage rate can be used as the first control signal to regulate the pumping device 51. Alternatively, a set of regulation information corresponding to the drainage rate and the operating power of the pumping device 51 can be pre-stored in the controller 70 of the electrolytic hydrogen production system 100. This set of regulation information can be formed by collecting the drainage rates of the pumping device 51 under various operating power conditions, so that the controller 70 can obtain the required operating power of the pumping device 51 from the regulation information set based on the obtained drainage rate, and form a corresponding first control signal to regulate the pumping device 51. By using the formula calculation, the maximum drainage rate for the hydrogen separator 30 to achieve stable drainage can be obtained more accurately, which is beneficial to improving the control accuracy and reliability of the electrolytic hydrogen production system 100.

[0078] See Figure 5 In one embodiment of this application, before the step of controlling the start of the liquid extraction device 51, the method further includes:

[0079] Step S01: Detect the liquid level information inside the hydrogen separator 30;

[0080] It is understandable that a liquid level detection device can be installed in the hydrogen separator 30 to detect the liquid level of the separated and stored liquid in the hydrogen separator 30 in a timely manner, so that the controller 70 can make corresponding adjustments to the liquid level changes in the hydrogen separator 30 in a timely manner, and ensure the stable operation of the electrolysis hydrogen production system 100.

[0081] Step S02: If the liquid level in the hydrogen separator 30 is greater than or equal to the first threshold, a drainage signal is sent to the pumping device 51.

[0082] At this time, when the liquid level detection device of the hydrogen separator 30 detects that the liquid level in the hydrogen separator 30 has risen to the first threshold, which can be a relatively high position of the liquid level in the hydrogen separator 30, the controller 70 can determine that the hydrogen separator 30 needs to be drained to avoid liquid overload in the hydrogen separator 30 and affect the normal operation of the hydrogen separator 30. Furthermore, when the liquid level in the hydrogen separator 30 is greater than or equal to the first threshold, the controller 70 can send a drainage signal to the pumping device 51, so as to control the pumping device 51 to start according to the drainage signal, and can also control the operation of the pipeline valves in the drainage assembly 50 according to the drainage signal, so that the pumping device 51 can stably draw water from the hydrogen separator 30 and collect it into the storage container 52 through the first connecting pipe 53 and the second connecting pipe 54, further improving the stability and reliability of the electrolytic hydrogen production system 100.

[0083] See Figure 6In one embodiment of this application, after the step of adjusting the operating power of the pumping device 51 according to the first control signal to regulate the flow rate of the liquid in the first connecting pipe 53, the method further includes:

[0084] Step S41: Detect the liquid level information inside the hydrogen separator 30;

[0085] When the hydrogen separator 30 is performing drainage operations, the liquid level detection device of the hydrogen separator 30 can be activated to detect and obtain the liquid level changes in the hydrogen separator 30 in a timely manner, so as to intervene and regulate the liquid discharge of the hydrogen separator 30 in response to the changes in liquid level, thereby achieving more stable and reliable system control of the electrolysis hydrogen production system 100.

[0086] Step S42: If the liquid level in the hydrogen separator 30 is less than or equal to the second threshold, a stop drainage signal is sent to the pumping device 51.

[0087] At this point, when the liquid level in the hydrogen separator 30 drops to the second threshold, it indicates that the liquid level in the hydrogen separator 30 has dropped to a lower level. This allows the controller 70 to send a stop-drain signal to the pumping device 51 to stop its operation. This helps prevent the pumping device 51 from drawing gas from the hydrogen separator 30 or from running dry, ensuring stable separation operation of the hydrogen separator 30, reducing damage caused by the pumping device 51 running dry, and further improving the stability and reliability of the electrolytic hydrogen production system 100. Specifically, when the controller 70 sends a stop-drain signal to the pumping device 51 to stop it, it can correspondingly control the valves on the first connecting pipe 53 and the second connecting pipe 54 to close, preventing backflow of fluid in the storage container 52 and further improving the stability of the electrolytic hydrogen production system 100.

[0088] See Figure 7 In one embodiment of this application, after the step of sending a stop drainage signal to the pumping device 51 if the liquid level in the storage container 52 is less than or equal to the second threshold, the method further includes:

[0089] Step S51: Control the start of the liquid extraction device 51 so that the liquid extraction device 51 extracts the liquid in the discharge storage container 52;

[0090] It is understandable that by storing the liquid separated in the hydrogen separator 30 in the storage container 52, the stored liquid can be returned to the preparation device 10 for full utilization, or the liquid in the storage container 52 can be discharged to other equipment for other uses. Furthermore, when the hydrogen separator 30 does not require drainage, the liquid pumping device 51 can be used to pump and discharge liquid from the storage container 52, so that the liquid pumping device 51 can be used not only for drainage of the hydrogen separator 30, but also for liquid reuse in the storage container 52, effectively enriching the functionality of the drainage component 50. Specifically, the pumping direction of the liquid pumping device 51 can be changed by adjusting the control valves on the connecting pipes between the liquid pumping device 51 and the hydrogen separator 30 and the storage container 52; or the liquid pumping device 51 can be integrated with two independent liquid pumping pipeline systems to achieve liquid pumping and discharge from the hydrogen separator 30 and the storage container 52 respectively, ensuring the stable operation of the electrolytic hydrogen production system 100.

[0091] Step S52: Detect and acquire hydrogen production information of the preparation device 10 and liquid level information of the hydrogen separator 30, and determine the set drainage time based on the hydrogen production information and liquid level information;

[0092] To achieve coordinated drainage of the hydrogen separator 30 and storage container 52 by the pumping device 51, the time for the pumping device 51 to complete the drainage of the storage container 52 should be set before the time required for the hydrogen separator 30 to be pumped. That is, the set drainage time required for the storage container 52 should not exceed the time it takes for the liquid level in the hydrogen separator 30 to rise to a first threshold. Therefore, when performing the drainage operation on the storage container 52, the preparation apparatus 10 and the hydrogen separator 30 can be monitored to determine the required drainage time for the hydrogen separator 30. The drainage rate of the pumping device 51 on the storage container 52 can then be adjusted accordingly to ensure that the storage container 52 completes drainage within the set drainage time.

[0093] The hydrogen production information of the preparation device 10 can be detected by the detection equipment on the preparation device 10. From the hydrogen production information, we can know the amount of hydrogen produced by the preparation device 10 under the operating power, the rate of hydrogen production, and the amount of water carried in the produced hydrogen. At this time, the liquid level information in the hydrogen separator 30 can be detected by the liquid level detection device in the hydrogen separator 30. Then, based on the hydrogen production information of the preparation device 10 and the liquid level information of the hydrogen separator 30, the set drainage time can be calculated from the following formula.

[0094] T≤60 / (V1 / V2)

[0095] In the above formula, T represents the set drainage time in minutes; V1 represents the amount of water entrained in the hydrogen produced by the preparation device 10 under operating power; and V2 represents the volume required for the hydrogen separator 30 to rise from the current liquid level to the first threshold.

[0096] Step S53: Detect the liquid volume in the storage container 52, and obtain a second control signal based on the liquid volume and the set drainage time, and adjust the operating power of the liquid pumping device 51 according to the second control signal.

[0097] Furthermore, based on the obtained set drainage time, the liquid volume in the storage container 52 at this time can be detected, and the drainage flow rate required for the storage container 52 to complete drainage within the set drainage time can be calculated. Furthermore, by detecting the fluid flow rate in the third connecting pipe 55 connecting the storage container 52 and the pumping device 51, and comparing the detected flow rate with the required drainage flow rate, a feedback signal for adjusting the power of the pumping device 51 can be obtained. This feedback signal can be sent as a second control signal to the pumping device 51 to control its operating power, so that the pumping device 51 can more stably complete the pumping and discharge of the storage container 52 within the set drainage time. Alternatively, the water flow rate in the third connecting pipe 55 of the pumping device 51 under different operating power can be collected, and the collected data can be stored in the controller 70 as a power control set. When the controller 70 obtains the required drainage flow rate of the storage container 52, it can quickly obtain the control power of the pumping device 51 from the power control set and send a corresponding second control signal to the pumping device 51, so that the pumping device 51 can be stably adjusted to the required operating power, ensuring that the storage container 52 can stably complete the drainage within the set drainage time.

[0098] Therefore, by adjusting the operating power of the pumping device 51 to correspond to the operating parameters of the preparation device 10, the hydrogen separator 30, and the storage container 52, the pressure stabilization and drainage of the hydrogen separator 30 can be effectively guaranteed, and the pumping device 51 can be stably switched between the drainage operation of the hydrogen separator 30 and the drainage operation of the storage container 52. This achieves stable and reliable control of the electrolytic hydrogen production system 100, further improving the system stability and reliability of the electrolytic hydrogen production system 100.

[0099] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. An electrolytic hydrogen production system, characterized in that, include: Preparation apparatus; A hydrogen separator, wherein the inlet end of the hydrogen separator is connected to the hydrogen outlet pipe of the preparation device; A drainage assembly includes a liquid pumping device, a storage container, a first connecting pipe, and a second connecting pipe. The first connecting pipe connects the drainage end of the hydrogen separator to the input end of the liquid pumping device, and the second connecting pipe connects the output end of the liquid pumping device to the inlet end of the storage container. A controller that adjusts the operating power of the pumping device based on the operating parameters of the electrolytic hydrogen production system.

2. The electrolytic hydrogen production system as described in claim 1, characterized in that, The drainage assembly further includes a third connecting pipe and a fourth connecting pipe. The third connecting pipe connects the drainage end of the storage container to the input end of the liquid extraction device, and the fourth connecting pipe connects to the output end of the liquid extraction device.

3. The electrolytic hydrogen production system as described in claim 2, characterized in that, The first connecting pipe is equipped with a first control valve, the second connecting pipe is equipped with a second control valve, the third connecting pipe is equipped with a third control valve, and the fourth connecting pipe is equipped with a fourth control valve.

4. The electrolytic hydrogen production system as described in claim 2, characterized in that, The input end of the liquid extraction device is connected to a first three-way valve, and the first connecting pipe and the third connecting pipe are respectively connected to the two input ends of the first three-way valve. The output end of the liquid extraction device is connected to a second three-way valve, and the second connecting pipe and the fourth connecting pipe are respectively connected to the two input ends of the second three-way valve.

5. The electrolytic hydrogen production system according to any one of claims 1 to 4, characterized in that, The storage container is a flash evaporator.

6. A drainage control method for an electrolytic hydrogen production system, applied to the electrolytic hydrogen production system as described in any one of claims 1 to 5, characterized in that, The drainage control method of the electrolytic hydrogen production system includes: The liquid extraction device is activated to extract and discharge the liquid from the hydrogen separator. The first operating condition information of the preparation device and the second operating condition information of the hydrogen separator are detected, and a first control signal is obtained based on the first operating condition information and the second operating condition information. The operating power of the pumping device is adjusted according to the first control signal to regulate the flow rate of the liquid in the first connecting pipe.

7. The drainage control method as described in claim 6, characterized in that, The step of detecting the first operating condition information of the preparation device and the second operating condition information of the hydrogen separator, and obtaining the first control signal based on the first operating condition information and the second operating condition information includes: The hydrogen production information of the preparation device is detected and acquired, and a first operating condition information is formed based on the hydrogen production information; The working pressure, standard pressure, and working temperature inside the hydrogen separator are detected and obtained, and a second operating condition information is generated based on the working pressure, standard pressure, and working temperature inside the hydrogen separator. The drainage rate of the hydrogen separator is calculated based on the first operating condition information and the second operating condition information, and a first control signal is obtained based on the drainage rate.

8. The drainage control method as described in claim 6, characterized in that, Before the step of controlling the start of the liquid extraction device to extract and discharge the liquid from the hydrogen separator, the method further includes: Detect the liquid level information inside the hydrogen separator; If the liquid level in the hydrogen separator is greater than or equal to the first threshold, a drainage signal is sent to the pumping device.

9. The drainage control method as described in claim 6, characterized in that, After the step of adjusting the operating power of the pumping device according to the first control signal to regulate the flow rate of the liquid in the first connecting pipe, the method further includes: Detect the liquid level information inside the hydrogen separator; If the liquid level in the hydrogen separator is less than or equal to the second threshold, a stop drainage signal is sent to the pumping device.

10. The drainage control method as described in claim 9, characterized in that, After the step of sending a stop drainage signal to the pumping device if the liquid level in the storage container is less than or equal to the second threshold, the method further includes: The liquid extraction device is activated to draw and discharge the liquid from the storage container. The hydrogen production information of the preparation device and the liquid level information of the hydrogen separator are detected and obtained, and the set drainage time is obtained based on the hydrogen production information and the liquid level information; The liquid level in the storage container is detected, and a second control signal is obtained based on the liquid level and the set drainage time. The operating power of the liquid pumping device is adjusted according to the second control signal.

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