Electrolytic hydrogen production system and control method thereof

Abstract

According to the electrolytic hydrogen production system and the control method thereof, one or more delay moments in the future, the content of hydrogen in oxygen or the content of oxygen in hydrogen in a gas-liquid separator of the system and other lag response information are predicted according to current power supply information, and inflation control information is determined according to the predicted value; therefore, before the hydrogen content in oxygen or the oxygen content in hydrogen exceeds the standard, the preset safe gas can be filled into the corresponding gas-liquid separator in advance according to the gas filling control information instead of starting to fill gas when the corresponding content is monitored to exceed the standard through a measuring instrument, so that the content of the related gas is predicted and effectively controlled; and the safety of the electrolytic hydrogen production system is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of electrolytic hydrogen production, and in particular to an electrolytic hydrogen production system and a control method thereof. Background Art

[0002] Hydrogen energy, that is, the chemical energy of hydrogen, has the characteristics of high energy density, long-term storage and almost no energy consumption. It is a renewable clean energy that has attracted much attention. Hydrogen energy is a secondary energy source that needs to be produced by certain methods using other energy sources.

[0003] Hydrogen production by water electrolysis refers to the dissociation of water molecules under the action of direct current to generate oxygen and hydrogen, which are precipitated from the anode and cathode of the electrolyzer respectively. The oxygen and hydrogen produced by electrolysis are dissolved in the electrolyte and need to be separated from the electrolyte by passing through a gas-liquid separator.

[0004] During the process of hydrogen production by electrolysis, the hydrogen produced at the cathode may pass through the diaphragm between the cathode and cathode and enter the anode, so that the oxygen separated in the gas-liquid separator on the oxygen side may be mixed with hydrogen. When the hydrogen content in oxygen exceeds the standard, there is a risk of explosion. Similarly, the hydrogen separated in the gas-liquid separator on the hydrogen side may also be mixed with oxygen, affecting the purity of the hydrogen and posing a risk of explosion.

[0005] Therefore, in order to ensure the safety and quality of the hydrogen production system by electrolysis, it is necessary to control the content of hydrogen in the oxygen separated by the system (i.e. the hydrogen content in oxygen) or the content of oxygen in the hydrogen separated by the system (i.e. the oxygen content in hydrogen). Summary of the invention

[0006] In order to control the content of hydrogen in oxygen or oxygen in hydrogen in a hydrogen production system by electrolysis, some embodiments of the present application provide a hydrogen production system by electrolysis and a control method thereof.

[0007] In a first aspect, some embodiments of the present application provide a method for controlling a hydrogen production system by electrolysis, comprising:

[0008] Obtaining the current power supply information of the electrolyzer in the electrolytic hydrogen production system at the current moment;

[0009] According to the current power supply information, predict the delayed response information of the electrolytic hydrogen production system at at least one delayed time after the current time; wherein the delayed response information includes at least one of the following: the hydrogen content in oxygen and the oxygen content in hydrogen in the gas-liquid separator of the electrolytic hydrogen production system;

[0010] determining inflation control information according to the delayed response information;

[0011] According to the inflation control information, the process of filling the preset safety gas into the gas-liquid separator is controlled.

[0012] In a possible implementation manner, the inflation control information includes: at least one inflation flow rate, and an inflation time corresponding to the inflation flow rate.

[0013] In a possible implementation manner, the control method further includes:

[0014] Determine the difference between the current power supply information and the historical power supply information; the historical power supply information includes the power supply information corresponding to the previous moment adjacent to the current moment;

[0015] When the difference reaches a preset condition, the method of predicting the delayed response information of the hydrogen production system by electrolysis at least one delayed time after the current time according to the current power supply information is executed.

[0016] In a possible implementation manner, the control method further includes:

[0017] Acquiring historical operation data of the hydrogen production system by electrolysis;

[0018] Determining at least one preset power supply information;

[0019] For each of the preset power supply information, according to the first historical moment when the preset power supply information appears, at least one hydrogen content in oxygen or oxygen content in hydrogen corresponding to a second historical moment is selected from the historical operation data to obtain a response data set corresponding to the preset power supply information; the second historical moment is later than the first historical moment;

[0020] According to the response data sets corresponding to the preset power supply information, the power supply information of the electrolyzer of the electrolytic hydrogen production system is fitted with the correlation between the hydrogen content in oxygen or the oxygen content in hydrogen in the gas-liquid separator of the electrolytic hydrogen production system to obtain an information fitting relationship;

[0021] Determining the delayed response information of the hydrogen production system by electrolysis according to the current power supply information includes: determining the delayed response information according to the information fitting relationship and the current power supply information.

[0022] In a possible implementation manner, the fitting function includes at least one of the following parameters:

[0023] The gas phase pressure of the gas-liquid separator;

[0024] The liquid inlet temperature of the gas-liquid separator;

[0025] The volume of the gas-liquid separator;

[0026] The volume of the electrolytic cell.

[0027] In a possible implementation manner, determining the inflation control information according to the delayed response information includes:

[0028] Determining oxygen-side charging control information corresponding to the oxygen-side gas-liquid separator in the gas-liquid separator according to the predicted hydrogen content in the oxygen;

[0029] The control method further comprises:

[0030] In the process of charging the preset safety gas into the oxygen-side gas-liquid separator according to the oxygen-side charging information, obtaining a first pressure in the oxygen-side gas-liquid separator and a second pressure in the hydrogen-side gas-liquid separator;

[0031] The hydrogen side charging control information corresponding to the hydrogen side gas-liquid separator is determined according to the first pressure and the second pressure.

[0032] In a second aspect, some embodiments of the present application further provide an electrolysis hydrogen production system, comprising:

[0033] Electrolyzer;

[0034] A gas-liquid separator; the liquid inlet of the gas-liquid separator is connected to the electrolytic cell; the gas-liquid separator is provided with a gas charging port for receiving a preset safety gas; the gas-liquid separator includes at least one of an oxygen-side gas-liquid separator and a hydrogen-side gas-liquid separator;

[0035] A control device, used for controlling the preset safety gas to be charged into the gas-liquid separator via the charging port according to the control method described in any one of claims 1 to 6.

[0036] In a possible implementation, the electrolysis hydrogen production system further includes: a gas storage device storing a preset safety gas; the gas storage device includes at least one of an oxygen storage device, a hydrogen storage device, and a nitrogen storage device;

[0037] The gas storage device is connected to the gas charging port via a gas charging pipe;

[0038] The inflation pipe is provided with an inflation valve;

[0039] The inflation control information determined by the control device includes the opening degree of the inflation valve.

[0040] In a possible implementation manner, the inflation pipe is further provided with at least one of the following valves:

[0041] a check valve, disposed between the inflation valve and the inflation port;

[0042] A pressure reducing valve, disposed between the inflation valve and the gas storage device;

[0043] A manual valve is connected in parallel with the inflation valve.

[0044] In a possible implementation manner, the inflation port is an independent opening of the gas-liquid separator;

[0045] Alternatively, the gas filling port is reused as the liquid inlet of the gas-liquid separator.

[0046] In summary, the electrolytic hydrogen production system and control method thereof provided in the embodiments of the present application predict the delayed response information such as the hydrogen content in oxygen or the oxygen content in hydrogen in the gas-liquid separator of the system at one or more delayed moments in the future based on the current power supply information, and determine the inflation control information based on the predicted value, so that the preset safety gas can be filled into the corresponding gas-liquid separator in advance according to the inflation control information before the hydrogen content in oxygen or the oxygen content in hydrogen exceeds the standard, instead of starting to inflate when the corresponding content exceeds the standard through the measuring instrument, thereby realizing the prediction and effective control of the relevant gas content and ensuring the safety of the electrolytic hydrogen production system.

[0047] Secondly, the above embodiment is simple and easy to implement. It does not require much improvement to the hydrogen production electrolysis system itself, and does not require the development of a more airtight diaphragm or a more efficient gas-liquid separation method. Therefore, the control of the hydrogen in oxygen and the oxygen content in hydrogen in the hydrogen production electrolysis system can be achieved at a relatively low cost. It can be widely used in hydrogen production electrolysis systems of different scales and types to ensure the safety of the hydrogen production electrolysis system. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a structural block diagram of a hydrogen production system by electrolysis in some embodiments of the present application;

[0049] Figure 2 A flow chart of a method for controlling a hydrogen production system by electrolysis provided in some embodiments of the present application;

[0050] Figure 3 A flow chart of a method for controlling a hydrogen production system by electrolysis provided in some embodiments of the present application;

[0051] Figure 4 This is a structural block diagram of a control device for an electrolytic hydrogen production system provided in some embodiments of the present application;

[0052] Figure 5 A structural block diagram of an electronic device provided in some embodiments of the present application;

[0053] Figure 6 A structural block diagram of a hydrogen production system by electrolysis provided in some embodiments of the present application;

[0054] Figure 7 This is a schematic diagram of the gas filling pipeline configuration of the electrolysis hydrogen production system provided in some embodiments of the present application. DETAILED DESCRIPTION

[0055] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0056] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0057] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0058] Figure 1 This is a structural block diagram of an electrolysis hydrogen production system provided in some embodiments of the present application. Figure 1 The electrolytic hydrogen production system 100 may include an electrolytic cell 110, an oxygen-side separation and purification system 120, a hydrogen-side separation and purification system 130, an electrolyte recovery system (not shown in the figure), etc.

[0059] The electrolyzer 110 may be an alkaline water electrolysis (ALK or AWE), a proton exchange membrane electrolyzer (PEM), an anion exchange membrane electrolyzer (AEM), or the like.

[0060] Direct current is applied to the electrolyte in the electrolytic cell 110 through the power supply system 200 to electrolyze water molecules. The oxygen (O2) produced at the anode accompanies the electrolyte into the oxygen side separation and purification system 120, and the hydrogen (H2) produced at the cathode accompanies the electrolyte into the hydrogen side separation and purification system 130.

[0061] In the oxygen side separation and purification system 120, the electrolyte containing oxygen first enters the oxygen side gas-liquid separator 121 to stand. Due to the different specific gravities of gas and liquid, the oxygen in the electrolyte will gradually rise until it leaves the gas-liquid interface, thereby achieving gas-liquid separation. The oxygen separated by the oxygen side gas-liquid separator 121 is then processed accordingly through a cooler, a drying tank, etc., to finally obtain an oxygen product.

[0062] Similarly, in the hydrogen side separation and purification system 130, the electrolyte containing hydrogen first enters the hydrogen side gas-liquid separator 131 for gas-liquid separation, and the separated hydrogen will also be processed accordingly through a cooler, a deoxygenation device, a drying tank, etc., and finally a hydrogen product is obtained.

[0063] The interiors of the oxygen side gas-liquid separator 121 and the hydrogen side gas-liquid separator 131 are divided into upper and lower parts by the gas-liquid interface; the lower part is the liquid phase part, that is, containing the electrolyte, and the upper part is the gas phase part, that is, containing the separated gas.

[0064] In addition, the electrolyte entering the oxygen-side gas-liquid separator 121 and the hydrogen-side gas-liquid separator 131 can be sent back to the electrolytic cell 110 for reuse through a recovery system after most of the gas is separated after standing for a period of time.

[0065] In the electrolytic hydrogen production system 100, the hydrogen generated on the cathode side of the electrolytic cell 110 will pass through the diaphragm between the anode and cathode to reach the anode side, and enter the oxygen side gas-liquid separator 121 together with the oxygen generated on the anode side, so that the separated oxygen is doped with hydrogen; similarly, the oxygen generated on the anode side of the electrolytic cell 110 will also pass through the diaphragm between the anode and cathode to reach the cathode side, and enter the hydrogen side gas-liquid separator 131 together with the hydrogen generated on the cathode side, so that the separated hydrogen is doped with oxygen.

[0066] Since there is a risk of explosion when the content of hydrogen in oxygen or oxygen in hydrogen reaches a certain level, for safety reasons, in the oxygen-side separation and purification system 120, an oxygen-side detection instrument 122 is usually provided on the outlet pipe of the oxygen-side gas-liquid separator 121 or the cooler to detect the quality of oxygen, such as the purity of oxygen, the content of hydrogen (O(H)) in oxygen, etc.; correspondingly, a hydrogen-side detection instrument 132 is also provided at a corresponding position in the hydrogen-side separation and purification system 130 to detect the quality of hydrogen, such as the purity of hydrogen, the content of oxygen (H(O)) in hydrogen, etc.

[0067] According to the structure and principle of the above-mentioned electrolytic hydrogen production system 100, it can be known that hydrogen in oxygen and oxygen in hydrogen already exist in the electrolytic cell 110, but they are not detected until the detection instrument placed at the rear end of the gas-liquid separator or even the rear end of the cooler; obviously, the gas-liquid separation process, the cooling process, etc., all require a certain amount of time, which leads to a long time lag in the system's detection of the content of hydrogen in oxygen and oxygen in hydrogen. In this case, the gas-liquid separator at the front end may have exploded due to the excessive content of the separated gas before the detection instrument at the rear end detects that the content exceeds the standard, posing a serious threat to the safety of the system.

[0068] Therefore, how to deal with the problem of excessive hydrogen in oxygen or excessive oxygen in hydrogen is the key to ensuring the safety of the electrolytic hydrogen production system. Theoretically, there are many ways to solve the above problems, such as: developing a highly airtight diaphragm to prevent hydrogen and oxygen from passing through the diaphragm between the anode and cathode; or developing a more efficient gas-liquid separation method to separate as much main gas as possible (for the oxygen side gas-liquid separator 121, oxygen is its main gas; for the hydrogen side gas-liquid separator 131, hydrogen is its main gas). However, these solutions require high costs and are difficult to implement.

[0069] In view of this, some embodiments of the present application provide a control method for a hydrogen production system by electrolysis, aiming to solve the safety risks of the hydrogen production system by electrolysis at a relatively low cost.

[0070] Figure 2 A schematic flow chart of a control method for an electrolytic hydrogen production system provided in some embodiments of the present application. Figure 2 , the control method may include the following steps:

[0071] Step 11, obtaining the current power supply information of the electrolyzer in the electrolytic hydrogen production system at the current moment;

[0072] by Figure 1 Taking the electrolysis hydrogen production system 100 as an example, the electrolyzer 110 is provided with the electric energy required for electrolysis by the power supply system 200; the size of the power supply is an important factor affecting the electrolysis efficiency of the electrolyzer 110. The power supply system 200 can be a battery stack of a power generation system such as photovoltaic power generation, wind power generation, etc.; the power supply rate of these power generation systems is greatly affected by natural environmental conditions, which is easy to cause fluctuations in the storage energy of the battery stack, and then cause changes in the power supply of the battery stack to the electrolyzer 110, which ultimately affects the electrolysis efficiency of the electrolyzer 110.

[0073] The lower the electrolysis efficiency of the electrolyzer 110, the lower the hydrogen and oxygen production per unit time, the less the amount of main gas separated in the oxygen-side gas-liquid separator 121 and the hydrogen-side gas-liquid separator 131, and thus the higher the content of hydrogen in oxygen and oxygen in hydrogen. Therefore, in order to control the content of hydrogen in oxygen and oxygen in hydrogen in the electrolytic hydrogen production system, it is necessary to monitor the power supply information of the electrolyzer 110 in real time.

[0074] In some embodiments, the above step 11 can be executed repeatedly during the operation of the electrolytic hydrogen production system to obtain power supply information in real time, that is, the current power supply information corresponding to the current moment. The above current power supply information can specifically be at least one of the following information: the real-time power supply power, real-time current density, and the ratio of the real-time power supply power to the preset power supply power applied by the power supply system 200 to the electrolyzer 110; or at least one of the following information: the average power supply power, average current density, and the ratio of the average power supply power to the preset power supply power applied by the power supply system 200 to the electrolyzer 110 within a period of time including the current moment.

[0075] It should be noted that the current power supply information obtained by the control method provided in some embodiments of the present application is not limited to the above information and can be configured according to the actual application scenario.

[0076] Step 12: predicting the delayed response information of the hydrogen production system by electrolysis at least one delayed time after the current time according to the current power supply information;

[0077] In some embodiments, the above-mentioned delayed response information includes but is not limited to at least one of the following information: the hydrogen content in oxygen and the oxygen content in hydrogen in the gas phase part of the gas-liquid separator of the electrolytic hydrogen production system.

[0078] From the foregoing description of the structure and working principle of the electrolytic hydrogen production system 100, it can be seen that it takes a certain amount of time for the power supply of the electrolytic cell 110 to change, for the oxygen production at the anode and the hydrogen production at the cathode to change accordingly, and for the amounts of oxygen and hydrogen separated by the oxygen-side gas-liquid separator 121 and the hydrogen-side gas-liquid separator 131 to change accordingly, thereby causing the hydrogen content in the oxygen in the oxygen-side gas-liquid separator 121 and the oxygen content in the hydrogen in the hydrogen-side gas-liquid separator 131 to change accordingly.

[0079] That is to say, the current power supply information changes at the current moment, resulting in corresponding changes in the hydrogen content in oxygen and the oxygen content in hydrogen at certain moments in the future (i.e., the delayed moments), which is a delayed response and cannot be measured by relevant measuring instruments at the current moment; therefore, this embodiment predicts the delayed response information such as the hydrogen content in oxygen and the oxygen content in hydrogen corresponding to one or more delayed moments based on the current power supply information, so as to take timely countermeasures to avoid exceeding the hydrogen content in oxygen or the oxygen content in hydrogen in the future.

[0080] The above-mentioned delayed response information may be a discrete value corresponding to different delay times. For example, assuming that the current time is time t0, the current power supply information can be combined with the configuration information such as the length of the pipeline between adjacent containers in the electrolytic hydrogen production system 100 and the capacity of the gas-liquid separator to predict one or more future times, that is, one or more delay times t after time t0. i(i=1,2,3……), the hydrogen content O_H in the oxygen in the oxygen-side gas-liquid separator 121 i , the oxygen content H_O in the hydrogen in the hydrogen side gas-liquid separator 131 i wait.

[0081] The above-mentioned delayed response information may also be a fitting function of the hydrogen content in oxygen and the oxygen content in hydrogen in the gas-liquid separator within a certain delay period in the future. For example, the fitting function of the hydrogen content in oxygen and the oxygen content in hydrogen can be directly analyzed and determined based on the current power supply information and the configuration information of the hydrogen production system 100; or, the above-mentioned O_H can be first determined based on the current power supply information, etc. i or H_O i Equal discrete values, and then according to these discrete values, determine the function O_H=f1(t) of the change of hydrogen content in oxygen with time t, the function H_O=f2(t) of the change of oxygen content in hydrogen with time, etc.

[0082] Step 13, determining inflation control information according to the delayed response information;

[0083] Step 14: Control the process of charging the preset safety gas into each gas-liquid separator according to the charging control information.

[0084] Exemplarily, after predicting the delayed response information such as the hydrogen content in oxygen and the oxygen content in hydrogen corresponding to one or more delay moments through step 12, these delayed response information can be compared with the preset threshold value in step 13, and the inflation control information (such as whether the corresponding gas-liquid separator needs to be inflated) can be determined according to the difference between these delayed response information and the preset threshold value, and then in step 14, the preset safety gas is filled into the corresponding gas-liquid separator according to the inflation control information to reduce the hydrogen content in oxygen and the oxygen content in hydrogen, thereby avoiding exceeding the standard.

[0085] Exemplarily, the preset threshold value can be the safe upper limit value of 2% of the hydrogen content in oxygen; through step 12, it is predicted that at the fifth delay time t5, the hydrogen content in oxygen in the oxygen-side gas-liquid separator 121 will reach 2%. If no relevant measures are taken, the hydrogen content in oxygen will continue to rise, bringing the risk of explosion; therefore, at times t1, t2, etc. before the delay time t5, the oxygen-side gas-liquid separator 121 can be filled with preset safety gases such as oxygen or nitrogen, so that when the actual time t5 is reached, the hydrogen content in oxygen can be lower than 2%, reducing the risk of explosion.

[0086] In the above embodiment, the hydrogen content in oxygen or the oxygen content in hydrogen in the gas-liquid separator at one or more future delay moments is predicted based on the current power supply information, and the inflation control information is determined based on the predicted value, so that before the hydrogen content in oxygen or the oxygen content in hydrogen exceeds the standard, the preset safety gas can be filled into the corresponding gas-liquid separator in advance according to the inflation control information, instead of starting to inflate when the corresponding content exceeds the standard through the measuring instrument, which more effectively avoids the relevant content from exceeding the standard and ensures the safety of the electrolytic hydrogen production system.

[0087] In some embodiments, in order to reduce costs, the preset safety gas may be nitrogen, which is low-cost, easily available, and has stable chemical properties.

[0088] In other embodiments, in order to ensure the purity of the oxygen product or hydrogen product, the preset safety gas may be the main gas corresponding to the gas-liquid separator. For example, instead of filling nitrogen, filling the oxygen-side gas-liquid separator 121 with its corresponding main gas, i.e., oxygen, can not only achieve the purpose of reducing the hydrogen content in oxygen, but also ensure the purity of the oxygen product finally obtained by the oxygen-side separation and purification system 120.

[0089] In other embodiments, the preset safety gas may also be other gases with stable chemical properties, such as inert gases such as helium and argon.

[0090] In actual application scenarios, appropriate preset safety gases can be selected based on product requirements, cost budgets, and other factors. For example, in an application scenario where only the purity of hydrogen products is required, the preset safety gas corresponding to the oxygen-side gas-liquid separator 121 can be nitrogen, and the preset safety gas corresponding to the hydrogen-side gas-liquid separator 131 can be hydrogen; and in an application scenario where the purity of both hydrogen products and oxygen products is required, the preset safety gas corresponding to the oxygen-side gas-liquid separator 121 is oxygen, and the preset safety gas corresponding to the hydrogen-side gas-liquid separator 131 is hydrogen.

[0091] In some embodiments, the inflation control information determined in the above step 13 may include not only whether to inflate the corresponding gas-liquid separator, but also the inflation start time, inflation flow rate, etc.

[0092] Exemplarily, the inflation flow rate may be a fixed value, that is, during the entire inflation process, the preset safety gas is uniformly charged into the corresponding gas-liquid separator according to the fixed value.

[0093] For example, the inflation flow rate may be a variable value, that is, inflation is performed at different flow rates at different times during the entire inflation process. Accordingly, determining the inflation control information in step 13 includes determining the inflation flow rates corresponding to different inflation times.

[0094] In some embodiments, the specific values ​​of the inflation start time, inflation flow rate, etc. in the above-mentioned inflation control information can be determined based on the rising rate of the hydrogen content in oxygen or the oxygen content in hydrogen in the hysteresis response information, the length of the interval between the delay time corresponding to the preset content value and the current time, etc.

[0095] For example, for the oxygen-side gas-liquid separator, the moment when the hydrogen content in the oxygen reaches 2% is considered a dangerous moment; assuming that the dangerous moment is determined according to the delayed response information to be the mth delayed moment t m ;

[0096] If m exceeds the corresponding threshold, it means that the hydrogen content in oxygen may exceed the standard after a long time. In this case, the corresponding inflation flow rate can be set to a smaller value, or the inflation start time can be set to a time far away from the current time (such as t i＝3 ) to avoid prematurely filling a large amount of preset safety gas into the oxygen side gas-liquid separator, causing waste or affecting the oxygen purity;

[0097] If m does not exceed the corresponding threshold, it means that the hydrogen content in oxygen may exceed the standard in a short time. In this case, the corresponding inflation flow rate can be set to a larger value, or the inflation start time can be set to a time closer to the current time (such as t i＝1 ) to quickly fill the oxygen-side gas-liquid separator with a sufficient amount of preset safety gas to suppress the increase of hydrogen content in oxygen;

[0098] In some embodiments, one or more different values ​​of inflation flow rates can be pre-configured according to parameters such as the volume of the gas-liquid separator, and the advance amount δ of the inflation start time corresponding to each value of the inflation flow rate relative to the dangerous moment; when the dangerous moment t is determined according to the delayed response information m After that, a value of the inflation flow rate and the corresponding advance amount δ are selected, and the inflation start time is determined as t in combination with the advance amount δ. m-δ .

[0099] In some embodiments, the hydrogen content in oxygen in the oxygen side gas-liquid separator 121 and the oxygen content in hydrogen in the hydrogen side gas-liquid separator 131 can be predicted based on step 12, and the oxygen side charging control information corresponding to the oxygen side gas-liquid separator 121 and the hydrogen side charging control information corresponding to the hydrogen side gas-liquid separator 131 can be determined based on step 13, and then in step 14, the preset safety gas is filled into the oxygen side gas-liquid separator 121 according to the oxygen side charging control information, and the preset safety gas is filled into the hydrogen side gas-liquid separator 131 according to the hydrogen side charging control information.

[0100] In some embodiments, in step 13, the oxygen-side charging control information corresponding to the oxygen-side gas-liquid separator 121 may be determined only according to the delayed response information, and then in the process of executing step 14, that is, in the process of charging the preset safety gas into the oxygen-side gas-liquid separator 121 according to the oxygen-side charging control information, the control method further includes determining the hydrogen-side charging control information corresponding to the hydrogen-side gas-liquid separator 131 through the following steps:

[0101] Obtaining a first pressure in the oxygen-side gas-liquid separator 121 and a second pressure in the hydrogen-side gas-liquid separator 131;

[0102] The hydrogen-side charging control information corresponding to the hydrogen-side gas-liquid separator 131 is determined according to the first pressure and the second pressure.

[0103] That is to say, in the above embodiment, the oxygen side charging control information can be determined in step 13 according to the delayed response information predicted in step 12, while the hydrogen side charging control information is determined according to the pressure of the oxygen side gas-liquid separator 121 and the hydrogen side gas-liquid separator 131.

[0104] Exemplarily, if the first pressure is lower than the second pressure, it can be determined that the hydrogen side gas-liquid separator 131 is not charged temporarily, or it can be determined that the hydrogen side charging flow in the hydrogen side charging control information is lower than the oxygen side charging flow in the oxygen side charging control information.

[0105] Exemplarily, if the first pressure is greater than the second pressure, it can be determined that the hydrogen side charging flow rate in the hydrogen side charging control information is greater than the oxygen side charging flow rate in the oxygen side charging control information.

[0106] In the above embodiment, during the process of inflating the oxygen side gas-liquid separator, the hydrogen side inflation control information is determined or adjusted according to the pressure of the two gas-liquid separators, and the inflation of the hydrogen side gas-liquid separator is controlled according to the hydrogen side inflation control information, thereby ensuring the pressure balance between the two gas-liquid separators and avoiding the gas-liquid separation speed being affected by excessive pressure on one side.

[0107] In some embodiments, the control method of the electrolysis hydrogen production system may further include, after step 11:

[0108] Determine whether the current power supply information meets the preset working conditions. If not, continue to execute step 12. If yes, return to step 11.

[0109] In the above embodiment, the above preset operating condition may also include different contents according to the different types of information included in the current power supply information. Exemplarily, for the current power supply power in the current power supply information, the above preset operating condition may include that the current power supply power of the power supply system 200 to the electrolytic cell 110 is greater than the preset power threshold.

[0110] The above preset working conditions represent the relevant parameter conditions that the hydrogen production and oxygen production of the electrolytic hydrogen production system are sufficient to ensure the safe operation of the system. When the current power supply information meets the preset working conditions, it can be ensured that the system will not exceed the standard of hydrogen in oxygen or oxygen in hydrogen due to low hydrogen production and oxygen production before electrolysis, that is, there will be no safety risk, and the gas-liquid separator does not need to be inflated. Therefore, in this case, step 12 and other related steps can be omitted, and step 11 can be directly returned; and when the current power supply information does not meet the preset working conditions, the hydrogen production and oxygen production may be greatly reduced, which may lead to the problem of excessive hydrogen in oxygen or oxygen in hydrogen. Therefore, in this case, the gas-liquid separator can be inflated through the above steps 12 to 14, so as to control the hydrogen in oxygen or oxygen in hydrogen in the gas-liquid separator and ensure system safety.

[0111] In some embodiments, in addition to determining whether to inflate the gas-liquid separator based on a preset operating condition, it may also be determined based on a change in power supply information. Figure 3 As shown, the control method of the above-mentioned electrolysis hydrogen production system may further include, after step 11:

[0112] Step 15, determine the difference between the current power supply information and the historical power supply information, and judge whether the difference meets the preset condition; if the preset condition is met, continue to execute step 12; if the preset condition is not met, return to step 11 to re-acquire the current power supply information at the next sampling time.

[0113] The above historical power supply information may include power supply information corresponding to the previous moment adjacent to the current moment. The above preset condition may include a threshold value for evaluating the difference between the current power supply information and the historical power supply information.

[0114] Exemplarily, the current power supply information is, at the current time t j , the power supply power P of the power supply system 200 to the electrolytic cell 110 j ; The historical power supply information is, at the previous moment t j-1 , the power supply power P of the power supply system 200 to the electrolytic cell 110 j-1 The difference between the current power supply information and the historical power supply information can be expressed as the power supply power P j and P j-1 The difference between j -P j-1 Or the difference percentage (P j -P j-1 ) / P j-1 *100%; accordingly, the above preset condition can be any of the following:

[0115] A: The difference between the power supply at the current moment and the previous moment P j -Pj-1 Less than -△P set , that is, P j -P j-1 <-△P set .

[0116] △P set is the power supply difference threshold, which is a positive number in watts (W) or kilowatts (kW). set =1kW, the preset condition A is met, that is, the power supply power at the current moment decreases by more than 1kW compared with the previous moment.

[0117] B: The difference in power between the current moment and the previous moment (P j -P j-1 ) / P j-1 *100% is less than -k%, that is, (P j -P j-1 ) / P j-1 *100%<-k%.

[0118] k% is the power supply power difference percentage threshold, which is a positive number. For example, if k%=1%, the preset condition B is satisfied, that is, the power supply power at the current moment decreases by more than 1% relative to the previous moment.

[0119] Regardless of whether the above-mentioned preset condition A or preset condition B is met, it can be explained that the power supply at the current moment has decreased compared with the previous moment, and the decrease has exceeded a certain degree, which may cause the hydrogen content in oxygen or the oxygen content in hydrogen to increase substantially in the future; therefore, when the above-mentioned preset conditions are met, the gas-liquid separator can be inflated in advance by continuing to execute step 12 and subsequent steps to avoid a substantial increase in the hydrogen content in oxygen or the oxygen content in hydrogen.

[0120] On the contrary, if the above preset conditions are not met, it means that the power supply at the current moment has not decreased much compared with the previous moment, or even the power supply at the current moment is greater than the power supply at the previous moment, which will not cause a significant increase in the hydrogen content in oxygen or the oxygen content in hydrogen in the future. Therefore, if the above preset conditions are not met, the current inflation control state of the electrolytic hydrogen production system can be kept unchanged, and the system returns to step 11 to enter the next control cycle to obtain the next moment t j+1 power supply information.

[0121] In addition, in some embodiments, after step 12, while executing subsequent related steps such as step 13 or step 14, the next control cycle can be started at any time, that is, step 11 is re-executed to obtain the power supply information at the next moment, thereby realizing continuous cycle control of the electrolysis hydrogen production system.

[0122] In some embodiments, the control method may further include:

[0123] Determine the power supply information change trend based on the current power supply information and the historical power supply information obtained at multiple historical moments between the current moment;

[0124] The inflation control information is adjusted according to the change trend of the power supply information.

[0125] In the above embodiment, the historical power supply information of multiple historical moments and the current power supply information of the current moment are arranged and compared in chronological order to determine the power supply information change trend, such as the power supply power gradually decreasing or increasing over time.

[0126] Since the power supply information is constantly changing, there will be a large deviation between the delayed response information predicted based on the power supply information at a certain moment and the actual response information, and the inflation control information determined based on the delayed response information may not meet the control requirements; therefore, in some embodiments, the above-mentioned inflation control information can be adjusted in combination with the changing trend of the power supply information.

[0127] For example, if the above-mentioned power supply information change trend includes that the power supply power gradually decreases over time, it means that the oxygen production and hydrogen production of the electrolyzer will also gradually decrease, and the risk of excessive hydrogen in oxygen or oxygen in hydrogen in the gas-liquid separator will gradually increase. Therefore, the inflation control information can be adjusted accordingly, such as increasing the inflation flow rate, advancing the inflation start time, etc., to suppress the increase of hydrogen in oxygen or oxygen in hydrogen, and ensure the safe operation of the electrolytic hydrogen production system.

[0128] In some embodiments, in the above step 12, the hysteresis response information of the electrolytic hydrogen production system is determined according to the current power supply information, and the following implementation methods can be used:

[0129] According to the current power supply information and the information fitting relationship between the power supply information and the response information, the delayed response information caused by the current power supply information is predicted.

[0130] The above information fitting relationship, that is, the association relationship between the power supply information x and the response information y caused by it, can predict the corresponding delayed response information y0 regardless of the current power supply information x0 obtained.

[0131] The above-mentioned information fitting relationship may include one or more; in different embodiments, different information fitting relationships can be obtained based on different types of power supply information (such as power supply power, current density or other parameters that can represent the power supply situation), or different types of response information (such as the hydrogen content in the oxygen in the gas phase part of the oxygen side gas-liquid separator, or the oxygen content in the hydrogen in the gas phase part of the hydrogen side gas-liquid separator, etc.), for predicting the required delayed response information.

[0132] In some embodiments, in order to determine the above information fitting relationship, the above control method may further include the following steps:

[0133] Acquire historical operation data of the hydrogen production system 100 by electrolysis;

[0134] Determine at least one preset power supply information x set_u (where u = 1, 2, 3, ...);

[0135] For each preset power supply information, according to the first historical moment when the preset power supply information appears, at least one hydrogen content in oxygen or oxygen content in hydrogen corresponding to a second historical moment is selected from the historical operation data to obtain a response data set corresponding to the preset power supply information; the second historical moment is later than the first historical moment;

[0136] According to the response data sets corresponding to the preset power supply information, the power supply information of the electrolyzer 110 of the hydrogen production system 100 and the correlation between the hydrogen content in oxygen or the oxygen content in hydrogen in the gas-liquid separators 121 and 131 of the hydrogen production system 100 are fitted to obtain the information fitting relationship.

[0137] It can be understood that the above-mentioned historical operation data records the operation information of the hydrogen production system 100 at different times. These operation information may include the power supply information of the electrolytic cell 110, the gas phase pressure in each gas-liquid separator, the hydrogen content in oxygen or the oxygen content in hydrogen, the oxygen flow rate and purity at the outlet of the oxygen side separation and purification system, the hydrogen flow rate and purity at the outlet of the hydrogen side separation and purification system, etc.; these operation information also have corresponding timestamps.

[0138] For example, the first preset power supply information x set 1 as an example, the corresponding response data set acquisition and relationship fitting process are as follows:

[0139] a) Find the preset power supply information x from the historical operation data set_1 The first historical moment 1_0 (That is, x set_1 The corresponding timestamp), and the timestamp is the first historical moment t 1_0 Response information y 1_0 ;

[0140] b) Filter out from the historical operation data, at the first historical moment t 1_0 One or more second historical moments t 1_v (where v = 1, 2, 3, ...), response information y such as the hydrogen content in oxygen and the oxygen content in hydrogen measured by relevant measuring instruments in the electrolytic hydrogen production system 100 1_v ;

[0141] The above response information y1_v (v=1,2,3,……) can be used as the preset power supply information x set_1 The corresponding response dataset.

[0142] c) Taking the first historical moment t 1_0 The corresponding response information y 1_0 is the initial value, combined with multiple second historical moments t 1_v The corresponding response information y 1_v , the preset power supply information x can be fitted set_1 The corresponding response information y1 changes with time t; this change relationship can be expressed as a function y1 = f(x set_1 , t).

[0143] Similarly, through the above process a) to c), the second preset power supply information x can be determined set_2 The corresponding response information y2 changes with time t. set_2 , t), the third preset power supply information x set_3 The corresponding response information y3 changes with time t. set_3 , t), etc., that is, any preset power supply information x can be determined set_u The corresponding response information y u The relationship y changes with time t u =f(x set_u , t)(u=1,2,3,……).

[0144] d) Comprehensive preset power supply information x set_u The corresponding response information y u , the relationship y=f(x, t) of the response information y corresponding to the power supply information x changing with time t is obtained by fitting, which is used as the above information fitting relationship.

[0145] It should be noted that since the parameters and information involved in the hydrogen production system by electrolysis are diverse, in order to simplify the fitting and prediction complexity and improve the prediction accuracy, different response information such as the hydrogen content in oxygen or the oxygen content in hydrogen can be fitted separately based on the above-mentioned fitting processes a) to d) to obtain different information fitting relationships; and then in step 12, the appropriate information fitting relationship can be selected for calculation and prediction according to the type of delayed response information to be predicted.

[0146] In some embodiments, there may be multiple parameters in the electrolysis hydrogen production system that affect the above-mentioned information fitting relationship, including but not limited to the gas phase pressure F of each gas-liquid separator, the liquid inlet temperature T of the gas-liquid separator, the volume V1 of the gas-liquid separator, the volume V2 of the electrolytic cell, etc.; when performing relationship fitting and response information prediction, these parameters can be configured as constants or independent variables.

[0147] For example, after the hardware equipment of the electrolytic hydrogen production system 100 is built, parameters such as the volume V1 of the gas-liquid separator and the volume V2 of the electrolytic cell are determined to remain unchanged. These parameters can be regarded as static parameters and can participate in the relationship fitting and response information prediction described in the above embodiment in the form of constants.

[0148] For example, parameters such as the gas phase pressure F of each gas-liquid separator in the electrolysis hydrogen production system 100 and the liquid inlet temperature T of the gas-liquid separator will change during the operation of the system, so these parameters can be regarded as dynamic parameters and participate in the relationship fitting and response information prediction described in the above embodiments in the form of independent variables; accordingly, the information fitting relationship can be expressed as a function y=f(x, t, F, T).

[0149] As described in the above embodiments, the information fitting relationship can be expressed in the form of a function. In other embodiments, the above information fitting relationship can also be configured in a pre-built prediction model, which uses the current power supply information as input data, and the corresponding output data is the hysteresis response information corresponding to the current power supply information.

[0150] Exemplarily, the prediction model can be a physical model, a mathematical model or a neural network model, etc. The prediction model can be obtained by training an original model with historical operation data; the prediction model can be applied to the above step 12 to realize the prediction of the delayed response information corresponding to any current power supply information.

[0151] All the above embodiments can be combined arbitrarily to form optional embodiments of the present application, which will not be described one by one here.

[0152] Figure 4 This is a schematic diagram of the structure of a control device for an electrolytic hydrogen production system provided in an embodiment of the present application, see Figure 4 , the control device 400 comprises:

[0153] An acquisition module 401 is used to acquire current power supply information of an electrolyzer in an electrolytic hydrogen production system at a current moment;

[0154] The prediction module 402 is used to predict the delayed response information of the hydrogen production system by electrolysis at least one delayed time after the current time according to the current power supply information; wherein the delayed response information includes at least one of the following: the hydrogen content in oxygen and the oxygen content in hydrogen in the gas-liquid separator of the hydrogen production system by electrolysis;

[0155] A determination module 403, configured to determine inflation control information according to the delayed response information;

[0156] The charging control module 404 is used to control the process of charging the preset safety gas into each gas-liquid separator according to the charging control information.

[0157] In some embodiments, the control device 400 may further include:

[0158] The judgment module is used to determine the difference between the current power supply information obtained by the acquisition module 401 and the historical power supply information, and trigger the prediction module 402 to predict the delayed response information when the difference reaches a preset condition.

[0159] In other embodiments, the judgment module may also execute other

[0160] In some embodiments, the control device 400 may further include:

[0161] The fitting module is used to fit the correlation between the power supply information received by the electrolyzer and the hydrogen content in oxygen or the oxygen content in hydrogen in the gas-liquid separator according to the historical operation data of the electrolytic hydrogen production system, so as to obtain the information fitting relationship.

[0162] Correspondingly, the prediction module 402 can specifically predict the delayed response information corresponding to the current power supply information through the information fitting relationship obtained by the fitting module.

[0163] In some embodiments, the inflation control information determined by the determination module 403 may specifically include the oxygen-side inflation control information corresponding to the oxygen-side gas-liquid separator; accordingly, the control device 400 may further include:

[0164] The balancing module is used to obtain the first pressure of the gas phase part in the oxygen side gas-liquid separator and the second pressure of the gas phase part in the hydrogen side gas-liquid separator, and determine the hydrogen side charging control information corresponding to the hydrogen side gas-liquid separator according to the first pressure and the second pressure.

[0165] Correspondingly, the above-mentioned inflation control module 404 can, on the one hand, control the inflation process of the oxygen side gas-liquid separator according to the oxygen side inflation control information determined by the determination module 403, and on the other hand, can control the inflation process of the hydrogen side gas-liquid separator according to the hydrogen side inflation control information determined by the balancing module.

[0166] It should be noted that the specific implementation of each module in the above-mentioned control device 400 can also refer to the above-mentioned method embodiment, which will not be repeated here.

[0167] The present application also provides an electronic device, see Figure 5The electronic device 500 includes a processor 501, a memory 502, and a program or instruction stored in the memory 502 and executable on the processor 501. When the program or instruction is executed by the processor 501, each process of the above-mentioned electrolysis hydrogen production system control method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. It should be noted that the electronic device in the embodiment of the present application includes a mobile electronic device and a non-mobile electronic device.

[0168] An embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the various processes of the above-mentioned electrolysis hydrogen production system control method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0169] The processor is the processor in the electronic device in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0170] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0171] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0172] The present application also provides a system for producing hydrogen by electrolysis, such as Figure 6 As shown, the electrolytic hydrogen production system 100' comprises: an electrolytic cell 110', an oxygen-side gas-liquid separator 121', a hydrogen-side gas-liquid separator 131' and a control device 140'.

[0173] Among them, the electrolytic cell 110' is powered by the power supply system 200; the anode liquid outlet of the electrolytic cell 110' is connected to the liquid inlet of the oxygen-side gas-liquid separator 121' through a liquid infusion pipeline, which is used to send the oxygen generated at the anode of the electrolytic cell 110' together with the electrolyte into the oxygen-side gas-liquid separator 121' for gas-liquid separation; the cathode liquid outlet of the electrolytic cell 110' is connected to the liquid inlet of the hydrogen-side gas-liquid separator 131' through a liquid infusion pipeline, which is used to send the hydrogen generated at the cathode of the electrolytic cell 110' together with the electrolyte into the hydrogen-side gas-liquid separator 131' for gas-liquid separation.

[0174] The oxygen side gas-liquid separator 121' is provided with a gas outlet for sending the separated oxygen to the next processing container, such as a cooler, a drying tank, etc. The oxygen side gas-liquid separator 121' and the cooler, drying tank and other equipment on the oxygen side together constitute the oxygen side separation and purification system 120', which is used to separate and purify the oxygen generated by electrolysis to obtain usable oxygen products.

[0175] The hydrogen side gas-liquid separator 131' is also provided with a gas outlet for sending the separated hydrogen to the next processing container. The hydrogen side gas-liquid separator 131' and the hydrogen side cooler, drying tank and other equipment together constitute the hydrogen side separation and purification system 130', which is used to separate and purify the hydrogen generated by electrolysis to obtain a usable hydrogen product.

[0176] The oxygen side gas-liquid separator 121' is also provided with a charging port 1211', through which a preset safety gas can be charged into the oxygen side gas-liquid separator 121'. The hydrogen side gas-liquid separator 131' is also provided with a charging port 1311', through which a preset safety gas can be charged into the hydrogen side gas-liquid separator 131'.

[0177] The control device 140' can execute any one of the above-mentioned embodiments of the electrolysis hydrogen production system control method to control the preset safety gas to be filled into the oxygen-side gas-liquid separator 121' through the filling port 1211' to reduce the hydrogen content in the oxygen in the oxygen-side gas-liquid separator 121', or control the preset safety gas to be filled into the hydrogen-side gas-liquid separator 131' through the filling port 1311' to reduce the oxygen content in the hydrogen in the hydrogen-side gas-liquid separator 131'.

[0178] Exemplarily, the control device 140' may be any one of the hydrogen production by electrolysis system control device 400, the electronic device 500, the computer-readable storage medium, etc., described in the previous embodiments.

[0179] In some embodiments, the charging port 1211' can be an independent opening on the oxygen side gas-liquid separator 121', and the charging port 1311' can be an independent opening on the hydrogen side gas-liquid separator 131', which are only used to charge the preset safety gas into the oxygen side gas-liquid separator 121' and the hydrogen side gas-liquid separator 131' respectively.

[0180] In other embodiments, the liquid inlet of any gas-liquid separator can also be reused as a charging port. That is, the liquid inlet is used to feed the electrolyte mixed with oxygen or hydrogen into the corresponding gas-liquid separator on the one hand, and is also used to charge the preset safety gas into the corresponding gas-liquid separator on the other hand. In this way, the charging control can be achieved without making major improvements to the gas-liquid separator.

[0181] Exemplarily, when the liquid inlet is reused as the inflation port, valves can be respectively provided on the inflation pipe and the liquid infusion pipe connected to the liquid inlet; when it is necessary to fill the corresponding gas-liquid separator with a preset safety gas, the valve on the inflation pipe can be opened and the valve on the liquid infusion pipe can be closed; when it is necessary to transport the electrolyte to the corresponding gas-liquid separator, the valve on the liquid infusion pipe can be opened and the valve on the inflation pipe can be closed.

[0182] In some embodiments, the electrolysis hydrogen production system 100 ′ may further include: at least one gas storage device storing a preset safety gas.

[0183] The gas storage device is connected to the gas charging port of each gas-liquid separator via a gas charging pipe, so that under the control of the control device 140', the preset safety gas stored in the gas storage device can be charged into the corresponding gas-liquid separator via the gas charging pipe and the gas charging port.

[0184] The gas storage device may include at least one of an oxygen storage device, a hydrogen storage device and a nitrogen storage device.

[0185] In some embodiments, Figure 6 As shown, the electrolytic hydrogen production system 100' is provided with a nitrogen storage device 151' and a hydrogen storage device 152'.

[0186] The nitrogen storage device 151' is connected to the charging port 1211' of the oxygen side gas-liquid separator 121'. The nitrogen storage device 151' provides the oxygen side gas-liquid separator 121' with a preset safety gas, namely nitrogen N2, so that the hydrogen content in the oxygen in the oxygen side gas-liquid separator 121' can be controlled at a relatively low cost.

[0187] The hydrogen storage device 152' is connected to the charging port 1311' of the hydrogen side gas-liquid separator 131'; the hydrogen storage device 152' is also connected to the hydrogen side separation and purification system 130', and the hydrogen stored in the hydrogen storage device 152' is the hydrogen obtained by the hydrogen side separation and purification system 130'. In other words, the hydrogen storage device 152' serves as a hydrogen product storage device of the electrolytic hydrogen production system 100' on the one hand, and also serves as a storage and supply device for the preset safety gas corresponding to the hydrogen side gas-liquid separator on the other hand, and there is no need to configure an additional storage device for the preset safety gas on the hydrogen side, thereby controlling the cost of the electrolytic hydrogen production system and simplifying the system structure.

[0188] Figure 7 Schematic diagram of the connection structure between the gas filling port of the gas-liquid separator and the gas storage device in some embodiments. Figure 7 The gas-liquid separator shown may be at least one of the oxygen-side gas-liquid separator 121 ′ and the hydrogen-side gas-liquid separator 131 ′, and correspondingly, the gas storage device may be an oxygen storage device, a hydrogen storage device, a nitrogen storage device, etc.

[0189] Reference Figure 7 The connecting pipe between the gas-liquid separator and the corresponding gas storage device is the inflation pipe 160'; the inflation pipe 160' is provided with an inflation valve 161'.

[0190] The inflation control information determined by the control device 140' may include the opening of the inflation valve 161'. Accordingly, the control device 140' may control the flow of the preset safety gas flowing through the inflation pipe 160', i.e., control the inflation flow, by controlling the opening of the inflation valve 161'. The inflation start time described in the above embodiments is the time when the control device 140' controls the inflation valve 161' to open.

[0191] In some embodiments, the inflation valve 161' can be a pneumatic valve or an electric valve, which can respond to the control signal sent by the control device 140' to adjust its own switching state or opening, so that the hydrogen content in oxygen and the oxygen content in hydrogen in the electrolysis hydrogen production system 100' can be automatically monitored and adjusted based on the control device 140'.

[0192] In some embodiments, Figure 7 As shown, a manual valve 164' is also provided on the inflation pipe 160' in parallel with the inflation valve 161', so that in special circumstances such as the inflation valve 161' fails or the maximum opening is not enough to meet the demand, relevant personnel can manually adjust the opening of the manual valve 164' to increase the inflation flow rate and meet the inflation demand of the corresponding gas-liquid separator.

[0193] In some embodiments, Figure 7 As shown, a check valve 162' may also be provided on the inflation pipe 160'; the check valve 162' is provided between the inflation valve 161' and the inflation port of the gas-liquid separator to prevent the gas in the gas-liquid separator from flowing back to the gas storage device.

[0194] In some embodiments, Figure 7 As shown, a pressure reducing valve 163' can also be provided on the inflation pipe 160'; the pressure reducing valve 163' is provided between the inflation valve 161' and the gas storage device, and can adjust the gas pressure output by the gas storage device to avoid excessive pressure inside the gas storage device, which may cause impact on the inflation pipe 160' or the gas-liquid separator, etc., thereby ensuring the safety of the inflation process.

[0195] The electrolytic hydrogen production system provided in the above embodiment does not need to be configured with a more airtight diaphragm or a more efficient gas-liquid separation method, and can control the content of hydrogen in oxygen and oxygen in hydrogen in the gas-liquid separator of the system at a relatively low cost; and there is no restriction on the scale and type of the system. For example, the capacity of the electrolytic cell can be either 100 standard cubic meters or 1000 standard cubic meters, and it can be either an alkaline electrolytic cell or a proton exchange membrane electrolytic cell, etc.

[0196] 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 device and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0197] Although one or more embodiments of this specification provide method operation steps as described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-creative labor. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent the only execution order. When the actual device or client product is executed, it can be executed in the order of the method shown in the embodiments or the drawings or in parallel (for example, in a parallel processor or multi-threaded processing environment).

[0198] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of the present application. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0199] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0200] The present application has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements may be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A method for controlling a hydrogen production system by electrolysis, characterized in that: include: Obtaining the current power supply information of the electrolyzer in the electrolytic hydrogen production system at the current moment; According to the current power supply information, predict the delayed response information of the electrolytic hydrogen production system at at least one delayed time after the current time; wherein the delayed response information includes at least one of the following: the hydrogen content in oxygen and the oxygen content in hydrogen in the gas-liquid separator of the electrolytic hydrogen production system; determining inflation control information according to the delayed response information; According to the inflation control information, the process of filling the preset safety gas into the gas-liquid separator is controlled.

2. The control method according to claim 1, characterized in that: The inflation control information includes: at least one inflation flow rate, and an inflation time corresponding to the inflation flow rate.

3. The control method according to claim 1, characterized in that: Also includes: Determining the difference between the current power supply information and the historical power supply information; The historical power supply information includes power supply information corresponding to the previous moment adjacent to the current moment; When the difference reaches a preset condition, the method of predicting the delayed response information of the hydrogen production system by electrolysis at least one delayed time after the current time according to the current power supply information is executed.

4. The control method according to claim 1, characterized in that: Also includes: Acquiring historical operation data of the hydrogen production system by electrolysis; Determining at least one preset power supply information; For each of the preset power supply information, according to the first historical moment when the preset power supply information appears, at least one hydrogen content in oxygen or oxygen content in hydrogen corresponding to the second historical moment is selected from the historical operation data to obtain a response data set corresponding to the preset power supply information; The second historical moment is later than the first historical moment; According to the response data sets corresponding to the preset power supply information, the power supply information of the electrolyzer of the electrolytic hydrogen production system is fitted with the correlation between the hydrogen content in oxygen or the oxygen content in hydrogen in the gas-liquid separator of the electrolytic hydrogen production system to obtain an information fitting relationship; Determining the delayed response information of the hydrogen production system by electrolysis according to the current power supply information includes: determining the delayed response information according to the information fitting relationship and the current power supply information.

5. The control method according to claim 4, characterized in that: The fitting function includes at least one of the following parameters: The gas phase pressure of the gas-liquid separator; The liquid inlet temperature of the gas-liquid separator; The volume of the gas-liquid separator; The volume of the electrolytic cell.

6. The control method according to claim 1, characterized in that: The step of determining the inflation control information according to the delayed response information includes: Determining oxygen-side charging control information corresponding to the oxygen-side gas-liquid separator in the gas-liquid separator according to the predicted hydrogen content in the oxygen; The control method further comprises: In the process of charging the preset safety gas into the oxygen-side gas-liquid separator according to the oxygen-side charging information, obtaining a first pressure in the oxygen-side gas-liquid separator and a second pressure in the hydrogen-side gas-liquid separator; The hydrogen side charging control information corresponding to the hydrogen side gas-liquid separator is determined according to the first pressure and the second pressure.

7. A hydrogen production system by electrolysis, characterized in that: include: Electrolyzer; A gas-liquid separator; the liquid inlet of the gas-liquid separator is connected to the electrolytic cell; the gas-liquid separator is provided with a gas charging port for receiving a preset safety gas; the gas-liquid separator includes at least one of an oxygen-side gas-liquid separator and a hydrogen-side gas-liquid separator; A control device, used for controlling the preset safety gas to be charged into the gas-liquid separator via the charging port according to the control method described in any one of claims 1 to 6.

8. The system according to claim 7, characterized in that It also includes: a gas storage device storing a preset safety gas; the gas storage device includes at least one of an oxygen storage device, a hydrogen storage device and a nitrogen storage device; The gas storage device is connected to the gas charging port via a gas charging pipe; The inflation pipe is provided with an inflation valve; The inflation control information determined by the control device includes the opening degree of the inflation valve.

9. The system according to claim 8, characterized in that The inflation pipe is also provided with at least one of the following valves: a check valve, disposed between the inflation valve and the inflation port; A pressure reducing valve, disposed between the inflation valve and the gas storage device; A manual valve is connected in parallel with the inflation valve.

10. The system according to claim 7, characterized in that The inflation port is an independent opening of the gas-liquid separator; Alternatively, the gas filling port is reused as the liquid inlet of the gas-liquid separator.

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