Pulse current regulation and control method and system for water electrolysis hydrogen production

Abstract

The invention discloses a pulse current regulation and control method and system for hydrogen production through water electrolysis, relates to the field of hydrogen production, and solves the problem of poor regulation and control of an existing pulse current regulation and control method.The pulse current regulation and control method comprises the steps that S1, electrolyte concentration corresponding to a sample hydrogen production batch is periodically monitored, and the periodic concentration average deviation degree is obtained according to a monitoring result; and S2, carrying out concentration change type analysis on the sample hydrogen production batches according to the periodic concentration average deviation degree, dividing the sample hydrogen production batches into solute normal batches and concentration abnormal batches according to an analysis result, carrying out hydrogen production efficiency analysis on the solute normal batches, and obtaining a periodic equipment hydrogen production rate according to the analysis result. And S3, pulse current regulation and control are conducted on the batch hydrogen production equipment with the normal solute according to the periodic equipment hydrogen production rate. The pulse current regulation and control method is high in pertinence and accuracy.

Description

Technical Field

[0001] This invention belongs to the field of hydrogen production and relates to pulse current regulation technology, specifically a pulse current regulation method and system for hydrogen production by water electrolysis. Background Technology

[0002] Existing pulse current control methods for hydrogen production via water electrolysis have the following drawbacks:

[0003] 1. Existing methods for producing hydrogen by water electrolysis do not analyze the dilution of the electrolyte solution based on the amount of hydrogen produced in each monitoring segment during the electrolyte concentration monitoring process. This makes it difficult to obtain the theoretical change value of the electrolyte concentration in each segment based on the analysis results, and the deviation analysis is not performed between the theoretical change value and the actual measured change value of the segment concentration, resulting in a lack of accuracy in the electrolyte concentration monitoring process.

[0004] 2. Existing methods for producing hydrogen through water electrolysis do not analyze the concentration change type of sample hydrogen production batches by using the average deviation of the periodic concentration during electrolyte concentration monitoring. It is difficult to classify the sample hydrogen production batches into batches with normal solute and batches with abnormal concentration based on the analysis results. Furthermore, hydrogen production efficiency analysis is not performed on batches with normal solute to obtain the hydrogen production rate of the periodic equipment. As a result, the process of obtaining the hydrogen production rate of the periodic equipment lacks specificity and is prone to wasting hydrogen production rate monitoring resources.

[0005] Therefore, we propose a pulse current control method and system for hydrogen production by water electrolysis. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a pulse current control method and system for hydrogen production via water electrolysis, thereby improving the targeting and accuracy of the pulse current control method for hydrogen production via water electrolysis.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a pulse current control method for hydrogen production by water electrolysis, comprising the following steps:

[0008] Step S1: Monitor the electrolyte concentration corresponding to the sample hydrogen production batch, and obtain the average deviation of the periodic concentration based on the monitoring results;

[0009] Step S2: Analyze the concentration change type of the sample hydrogen production batches based on the average deviation of the periodic concentration. Based on the analysis results, divide the sample hydrogen production batches into solute normal batches and concentration abnormal batches. Analyze the hydrogen production efficiency of the solute normal batches and obtain the hydrogen production rate of the periodic equipment based on the analysis results.

[0010] Step S3: Adjust the pulse current of the hydrogen production equipment for normal batches of solute according to the hydrogen production rate of the cycle equipment.

[0011] Furthermore, step S1 also includes the following steps:

[0012] Step S11: Obtain a sample hydrogen production batch from the water electrolysis hydrogen production batch that requires pulse current regulation;

[0013] Step S12: During the process of monitoring the electrolyte concentration of the sample hydrogen production batch, the hydrogen production equipment corresponding to the sample hydrogen production batch is obtained to obtain the sample hydrogen production equipment.

[0014] Step S13: Obtain the time point of the last injection of electrolyte aqueous solution into the sample hydrogen production equipment to obtain the start time point of the concentration cycle, and set the time interval between the start time point of the concentration cycle and the current time as the electrolyte concentration monitoring cycle;

[0015] Step S14: Perform electrolyte concentration analysis on the sample electrolysis equipment during the electrolyte concentration monitoring cycle, and obtain the average deviation of the cycle concentration based on the analysis results.

[0016] Furthermore, step S14 also includes the following steps:

[0017] Step S141: Obtain the original electrolyte concentration value, set a preset concentration change ratio, calculate the product of the original electrolyte concentration value and the preset concentration change ratio to obtain the preset electrolyte concentration value, and obtain the time point when the electrolyte concentration value corresponding to the sample electrolysis device reaches the preset electrolyte concentration value to obtain the preset concentration monitoring time point.

[0018] Step S142: Set the time interval between the start time of the concentration cycle and the preset concentration monitoring time point as the characteristic concentration duration. Within the electrolyte concentration monitoring cycle, set a real-time concentration monitoring window. Use the real-time concentration monitoring window to iterate through the electrolyte concentration monitoring cycle to obtain multiple real-time concentration change values.

[0019] Step S143: Analyze the electrolyte concentration change of the sample electrolysis device located in the real-time concentration monitoring window, and obtain the real-time concentration change value of the window based on the analysis results;

[0020] Step S144: Set a preset value for real-time concentration change. If the real-time concentration change value of the window is greater than or equal to the preset value, then set the corresponding real-time concentration monitoring window as a valid monitoring window. If the real-time concentration change value of the window is less than the preset value, then set the corresponding real-time concentration monitoring window as an invalid monitoring window.

[0021] Step S145: Set the time period corresponding to the effective monitoring window to the N1 concentration change segment to the Na-1 concentration change segment, and set the corresponding segment concentration change value to the N1 segment concentration change value to the Na-1 segment concentration change value.

[0022] Step S146: Obtain the volume of hydrogen produced by the N1 concentration change segment to the Na-1 concentration change segment of the sample electrolysis equipment to obtain the volume produced by the N1 segment to the Na-1 segment.

[0023] Step S147: Based on the N1 fragment preparation volume, obtain the theoretical change value of electrolyte concentration of the sample electrolysis equipment during the N1 concentration change segment, and obtain the theoretical change value of N1 concentration.

[0024] Step S148: Repeat the theoretical change value of N1 concentration to obtain the theoretical change value of electrolyte concentration for the sample electrolysis device in each concentration change segment, and obtain the theoretical change value of N2 concentration to the theoretical change value of Na-1 concentration.

[0025] Step S149: Calculate the difference between the N1 fragment concentration change value and the theoretical N1 concentration change value, and calculate the deviation between the absolute value of the difference and the theoretical N1 concentration change value to obtain the N1 concentration change deviation. Similarly, calculate the difference between the Na-1 fragment concentration change value and the theoretical N2 concentration change value, and calculate the deviation between the absolute value of the difference and the theoretical Na-1 concentration change value to obtain the Na-1 concentration change deviation. Calculate the average value of the N1 concentration change deviation to the Na-1 concentration change deviation to obtain the periodic concentration average deviation.

[0026] Furthermore, step S143 also includes the following steps:

[0027] Several concentration monitoring points are set up inside the sample electrolysis equipment. The electrolyte concentration value corresponding to the start time of the concentration monitoring real-time window for each concentration monitoring point is acquired, and the average of the multiple electrolyte concentration values ​​is calculated to obtain the starting electrolyte concentration value. The electrolyte concentration value corresponding to the end time of the concentration monitoring real-time window for each concentration monitoring point is acquired, and the average of the multiple electrolyte concentration values ​​is calculated to obtain the ending electrolyte concentration value.

[0028] Calculate the difference between the starting and ending electrolyte concentration values, and take the absolute value of the difference to obtain the real-time concentration change value of the window.

[0029] Step S142 further includes the following steps:

[0030] Several concentration monitoring points are set up inside the sample electrolysis equipment. The average value of the electrolyte concentration at each concentration monitoring point is calculated to obtain multiple electrolyte concentration values.

[0031] Calculate the difference in electrolyte concentration between any two adjacent time points, and take the absolute value of the difference to obtain the concentration change values ​​for multiple time segments.

[0032] Furthermore, step S147 also includes the following steps:

[0033] Obtain the N1 electrolyte concentration value, obtain the mass of the aqueous solution corresponding to the beginning time point of the N1 concentration change segment of the sample electrolysis device, and obtain the N1 water mass value. Obtain the volume of hydrogen produced by the sample electrolysis device during the N1 concentration change segment, and obtain the N1 segment production volume.

[0034] Obtain the theoretical consumption of hydrogen-containing aqueous solution, calculate the product of the N1 fragment production volume and the theoretical consumption of hydrogen-containing aqueous solution, and obtain the theoretical mass of N1 aqueous solution consumed.

[0035] The electrolyte mass corresponding to the start time point of the N1 concentration change segment of the sample electrolysis device was obtained to obtain the N1 electrolyte mass value. The electrolyte solution mass value corresponding to the start time point of the N1 concentration change segment of the sample electrolysis device was obtained to obtain the N1 electrolyte solution mass value.

[0036] The theoretical change in N1 concentration is obtained by calculating the mass values ​​of N1 electrolyte, N1 electrolyzed solution, and the theoretical mass of N1 aqueous solution consumed.

[0037] Furthermore, step S2 also includes the following steps:

[0038] Step S21: Obtain the average deviation of the periodic concentration, set a reasonable deviation range for the periodic concentration, classify the hydrogen production batch of samples whose average deviation of the periodic concentration is within the reasonable deviation range as solute normal batches, and classify the hydrogen production batch of samples whose average deviation of the periodic concentration is not within the reasonable deviation range as solute abnormal batches.

[0039] Step S22: Perform hydrogen production efficiency analysis on normal batches of solute, and obtain the hydrogen production rate of the cycle equipment based on the analysis results.

[0040] Furthermore, step S22 also includes the following steps:

[0041] During the hydrogen production efficiency analysis of normal batches of solute, a hydrogen production rate monitoring cycle is set.

[0042] The volume of hydrogen produced by the hydrogen production equipment in normal batches of solute during the hydrogen production rate monitoring cycle is obtained to obtain the cycle hydrogen production volume. The cycle duration corresponding to the hydrogen production rate monitoring cycle is obtained to obtain the hydrogen production cycle duration. The ratio of the cycle hydrogen production volume to the hydrogen production cycle duration is calculated to obtain the cycle equipment hydrogen production rate.

[0043] Furthermore, step S3 also includes the following steps:

[0044] Obtain the hydrogen production rate of the cycle equipment, obtain the preset range of the cycle hydrogen production rate, and obtain the upper limit and lower limit of the preset range of the cycle hydrogen production rate based on the preset range of the cycle hydrogen production rate.

[0045] For electrolysis equipment whose cycle hydrogen production rate exceeds the upper limit of the preset range of cycle hydrogen production rate, the pulse current power is reduced until the cycle hydrogen production rate is within the preset range of cycle hydrogen production rate.

[0046] If the hydrogen production rate of the cycle equipment is less than the lower limit of the preset range of cycle hydrogen production rate, the pulse current of the electrolysis equipment will be increased until the hydrogen production rate of the cycle equipment is within the preset range of cycle hydrogen production rate.

[0047] If the hydrogen production rate of the cycle equipment is within the preset range of the cycle hydrogen production rate, there is no need to adjust the power of the pulse current.

[0048] A pulse current control system for hydrogen production by water electrolysis includes:

[0049] Concentration monitoring module: Monitors the electrolyte concentration corresponding to the sample hydrogen production batch and obtains the average deviation of the periodic concentration based on the monitoring results;

[0050] Efficiency monitoring module: Analyzes the concentration change type of sample hydrogen production batches based on the average deviation of the cycle concentration, classifies the sample hydrogen production batches into solute normal batches and concentration abnormal batches based on the analysis results, analyzes the hydrogen production efficiency of solute normal batches, and obtains the hydrogen production rate of the cycle equipment based on the analysis results.

[0051] Pulse control module: Adjusts the pulse current of the hydrogen production equipment for normal batches of solute according to the hydrogen production rate of the cycle equipment.

[0052] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0053] 1. In the process of monitoring electrolyte concentration, this invention obtains the amount of hydrogen produced for each monitoring segment to analyze the dilution of the electrolyte solution, obtains the theoretical change value of electrolyte concentration for each segment based on the analysis results, and performs deviation analysis between the theoretical change value and the actual measured change value of electrolyte concentration for each segment, thereby improving the accuracy of the electrolyte concentration monitoring process.

[0054] 2. In the process of monitoring electrolyte concentration, this invention analyzes the concentration change type of sample hydrogen production batches by the average deviation of the periodic concentration. Based on the analysis results, the sample hydrogen production batches are divided into solute normal batches and concentration abnormal batches. Hydrogen production efficiency analysis is performed on the solute normal batches to obtain the hydrogen production rate of the periodic equipment, thereby ensuring the targeted monitoring of the hydrogen production rate of the periodic equipment and improving the utilization efficiency of hydrogen production rate monitoring resources. Attached Figure Description

[0055] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0056] Figure 1 This is a diagram illustrating the implementation steps of the present invention;

[0057] Figure 2 This is an overall system block diagram of the present invention. Detailed Implementation

[0058] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0059] Example 1

[0060] Please see Figure 1 This invention provides a technical solution: a pulse current control method for hydrogen production by water electrolysis, comprising the following steps:

[0061] Step S1: Periodically monitor the electrolyte concentration corresponding to the sample hydrogen production batch, and obtain the average deviation of the periodic concentration based on the monitoring results;

[0062] Step S1 further includes the following steps:

[0063] The batches of hydrogen production by water electrolysis that require pulse current regulation are obtained, resulting in multiple batches of hydrogen production by water electrolysis. Then, one sample batch of hydrogen production is randomly selected from the multiple batches of hydrogen production by water electrolysis.

[0064] During the process of monitoring the electrolyte concentration of the sample hydrogen production batch, the hydrogen production equipment corresponding to the sample hydrogen production batch is obtained, and the sample hydrogen production equipment is obtained.

[0065] The time point at which the electrolyte aqueous solution was injected into the sample hydrogen production equipment was obtained to obtain the start time point of the concentration cycle. The time point corresponding to the current moment was set as the end time point of the concentration cycle, and the time period between the start time point and the end time point of the concentration cycle was set as the electrolyte concentration monitoring cycle.

[0066] It should be noted here that:

[0067] In this application, the electrolyte referred to herein is sodium hydroxide, and the sample hydrogen production equipment referred to herein is an alkaline electrolyzer.

[0068] In this application, the sample hydrogen production equipment will not be replenished with water during the electrolyte concentration monitoring period.

[0069] Electrolyte concentration analysis was performed on the sample electrolysis equipment during the electrolyte concentration monitoring cycle, and the average deviation of the cycle concentration was obtained based on the analysis results.

[0070] Specifically as follows:

[0071] Obtain the original electrolyte concentration value, set a preset concentration change ratio, calculate the product of the original electrolyte concentration value and the preset concentration change ratio to obtain the preset electrolyte concentration value, and obtain the time point when the electrolyte concentration value corresponding to the sample electrolysis device reaches the preset electrolyte concentration value to obtain the preset concentration monitoring time point.

[0072] It should be noted here that:

[0073] In this application, the preset concentration change ratio is 99%.

[0074] Set the characteristic concentration duration to the time interval between the start time of the concentration cycle and the preset concentration monitoring time. Within the electrolyte concentration monitoring cycle, set a real-time concentration monitoring window. Use the real-time concentration monitoring window to iterate through the electrolyte concentration monitoring cycle to obtain real-time concentration change values ​​for multiple windows.

[0075] It should be noted here that:

[0076] In this application, the real-time concentration monitoring window referred to herein is specifically a sliding time segment for monitoring the electrolysis of the electrolysis equipment.

[0077] Electrolyte concentration changes were analyzed for the sample electrolysis equipment located within the real-time concentration monitoring window, and the real-time concentration change value of the window was obtained based on the analysis results.

[0078] Specifically as follows:

[0079] Several concentration monitoring points are set up inside the sample electrolysis equipment. The electrolyte concentration value corresponding to the start time of the concentration monitoring real-time window for each concentration monitoring point is acquired, and the average of the multiple electrolyte concentration values ​​is calculated to obtain the starting electrolyte concentration value. The electrolyte concentration value corresponding to the end time of the concentration monitoring real-time window for each concentration monitoring point is acquired, and the average of the multiple electrolyte concentration values ​​is calculated to obtain the ending electrolyte concentration value.

[0080] Calculate the difference between the initial electrolyte concentration and the final electrolyte concentration, and take the absolute value of the difference to obtain the real-time concentration change value of the window.

[0081] Set a preset value for real-time concentration change. If the real-time concentration change value of the window is greater than or equal to the preset value, the corresponding real-time concentration monitoring window will be set as a valid monitoring window. If the real-time concentration change value of the window is less than the preset value, the corresponding real-time concentration monitoring window will be set as an invalid monitoring window.

[0082] It should be noted here that:

[0083] In this application, the preset value for real-time concentration change is the minimum real-time concentration change value corresponding to the historical effective monitoring window.

[0084] Set the time period corresponding to the effective monitoring window as the N1 concentration change segment to the Na-1 concentration change segment, and set the corresponding segment concentration change value as the N1 segment concentration change value to the Na-1 segment concentration change value.

[0085] The volume of hydrogen produced by the sample electrolysis equipment from the N1 concentration change segment to the Na-1 concentration change segment is obtained to obtain the volume produced by the N1 segment to the Na-1 segment.

[0086] The theoretical change in electrolyte concentration of the sample electrolysis equipment during the N1 concentration change segment is obtained based on the N1 fragment preparation volume, thus obtaining the theoretical change in N1 concentration.

[0087] Specifically as follows:

[0088] Obtain the N1 electrolyte concentration value, obtain the mass of the aqueous solution corresponding to the beginning time point of the N1 concentration change segment of the sample electrolysis device, and obtain the N1 water mass value. Obtain the volume of hydrogen produced by the sample electrolysis device during the N1 concentration change segment, and obtain the N1 segment production volume.

[0089] Obtain the theoretical consumption of hydrogen-containing aqueous solution, calculate the product of the N1 fragment production volume and the theoretical consumption of hydrogen-containing aqueous solution, and obtain the theoretical mass of N1 aqueous solution consumed.

[0090] It should be noted here that:

[0091] In this application, the theoretical consumption of the hydrogen-producing aqueous solution is specifically 803.52, meaning that approximately 803.52 grams of water are required to produce 1 cubic meter of hydrogen.

[0092] The electrolyte mass corresponding to the start time point of the N1 concentration change segment of the sample electrolysis device was obtained to obtain the N1 electrolyte mass value. The electrolyte solution mass value corresponding to the start time point of the N1 concentration change segment of the sample electrolysis device was obtained to obtain the N1 electrolyte solution mass value.

[0093] The theoretical change in N1 concentration is obtained by calculating the mass values ​​of N1 electrolyte, N1 electrolytic solution, and the theoretical mass of N1 aqueous solution consumed.

[0094] The theoretical change in N1 concentration is calculated using the following formula:

[0095] ;

[0096] Wherein, Nbh1 is the theoretical change in N1 concentration, Zzl1 is the mass value of N1 electrolyte, Yzl1 is the mass value of N1 electrolyzed solution, and Yyz1 is the theoretical mass of N1 aqueous solution consumed;

[0097] Repeat the theoretical change value of N1 concentration to obtain the theoretical change value of electrolyte concentration for the sample electrolysis equipment in each concentration change segment, and obtain the theoretical change value of N2 concentration to the theoretical change value of Na-1 concentration;

[0098] Calculate the difference between the N1 fragment concentration change value and the theoretical N1 concentration change value, and calculate the deviation between the absolute value of the difference and the theoretical N1 concentration change value to obtain the N1 concentration change deviation degree. Similarly, calculate the difference between the Na-1 fragment concentration change value and the theoretical N2 concentration change value, and calculate the deviation between the absolute value of the difference and the theoretical Na-1 concentration change value to obtain the Na-1 concentration change deviation degree.

[0099] The average value of the deviation from N1 concentration change to Na-1 concentration change is calculated to obtain the average deviation of the periodic concentration.

[0100] In step S1 above, the amount of hydrogen produced for each monitoring segment is obtained to analyze the dilution of the electrolyte solution. Based on the analysis results, the theoretical change value of the electrolyte concentration of the segment is obtained, and a deviation analysis is performed between this theoretical change value and the actual measured change value of the segment concentration. This has the following advantages:

[0101] By combining dynamic correlation analysis of hydrogen production and electrolyte solution dilution, a theoretical concentration change model was constructed, and the deviation was compared with actual monitoring data, thus realizing a two-way verification mechanism for electrolyte concentration changes.

[0102] The above process not only improves the dynamic adaptability of concentration monitoring through the interaction and correction of theoretical derivation and measured data, but also identifies abnormal fluctuations or systematic errors in the monitoring process in a timely manner, thereby optimizing the adjustment efficiency of monitoring strategies.

[0103] Step S2: Analyze the concentration change type of the sample hydrogen production batches according to the average deviation of the periodic concentration. Based on the analysis results, divide the sample hydrogen production batches into solute normal batches and concentration abnormal batches. Analyze the hydrogen production efficiency of the solute normal batches and obtain the hydrogen production rate of the periodic equipment based on the analysis results.

[0104] Step S2 further includes the following steps:

[0105] Step S21: Obtain the average deviation of the periodic concentration, set a reasonable deviation range for the periodic concentration. If the average deviation of the periodic concentration is within the reasonable deviation range, the sample hydrogen production batch is classified as a solute normal batch. If the average deviation of the periodic concentration is not within the reasonable deviation range, the sample hydrogen production batch is classified as a solute abnormal batch.

[0106] Step S22: Perform hydrogen production efficiency analysis on normal batches of solute, and obtain the hydrogen production rate of the cycle equipment based on the analysis results;

[0107] Step S22 further includes the following steps:

[0108] In the process of analyzing the hydrogen production efficiency of normal batches of solute, the time point when the hydrogen production equipment of normal batches of solute starts working is set as the first rate analysis time point, the time point corresponding to the current moment is set as the second rate analysis time point, and the time between the first rate analysis time point and the second rate analysis time point is set as the hydrogen production rate monitoring cycle.

[0109] The volume of hydrogen produced by the hydrogen production equipment in the normal batch of solute during the hydrogen production rate monitoring cycle is obtained to obtain the cycle hydrogen production volume. The cycle duration corresponding to the hydrogen production rate monitoring cycle is obtained to obtain the hydrogen production cycle duration. The ratio of the cycle hydrogen production volume to the hydrogen production cycle duration is calculated to obtain the cycle equipment hydrogen production rate.

[0110] In step S2 above, the concentration change type of the sample hydrogen production batch is analyzed by the average deviation of the periodic concentration. Based on the analysis results, the sample hydrogen production batch is divided into batches with normal solute and batches with abnormal concentration. The hydrogen production efficiency of the batches with normal solute is analyzed to obtain the hydrogen production rate of the periodic equipment. This has the following advantages:

[0111] Classifying hydrogen production batches by periodic concentration average deviation allows for precise differentiation between batches with normal solute conditions and those exhibiting abnormal concentrations, preventing anomalous data from interfering with the evaluation of equipment hydrogen production efficiency. Analyzing the hydrogen production efficiency of batches with normal solute conditions provides a more accurate reflection of the actual hydrogen production rate under stable conditions, offering a reliable basis for equipment performance monitoring, maintenance strategy development, and process parameter optimization.

[0112] Meanwhile, timely identification of abnormal batches helps to quickly pinpoint potential problems (such as uneven solute distribution, equipment operation fluctuations, etc.), thereby enabling targeted improvement measures to ensure the stability and efficiency of the overall hydrogen production process. This method, through the synergistic effect of classification and efficiency analysis, improves the precision of hydrogen production process management, providing dual assurance for the efficient operation of the system.

[0113] Step S3: Adjust the pulse current of the hydrogen production equipment for normal batches of solute according to the hydrogen production rate of the cycle equipment;

[0114] Step S3 further includes the following steps:

[0115] Obtain the hydrogen production rate of the cycle equipment, obtain the preset range of the cycle hydrogen production rate, and obtain the upper limit and lower limit of the preset range of the cycle hydrogen production rate based on the preset range of the cycle hydrogen production rate.

[0116] If the hydrogen production rate of the cycle equipment is greater than the upper limit of the preset range of cycle hydrogen production rate, the pulse current power is reduced until the hydrogen production rate of the cycle equipment is within the preset range of cycle hydrogen production rate.

[0117] If the hydrogen production rate of the cycle equipment is less than the lower limit of the preset range of cycle hydrogen production rate, the pulse current power is increased until the hydrogen production rate of the cycle equipment is within the preset range of cycle hydrogen production rate.

[0118] If the hydrogen production rate of the cycle equipment is within the preset range of the cycle hydrogen production rate, there is no need to adjust the power of the pulse current.

[0119] In this application, if a corresponding calculation formula appears, the above calculation formula is a dimensionless calculation. The weighting coefficient, proportional coefficient and other coefficients in the formula are set to quantify each parameter to obtain a result value. The size of the weighting coefficient and proportional coefficient is only required to not affect the proportional relationship between the parameter and the result value.

[0120] Example 2

[0121] Please see Figure 2Based on another concept of the same invention, a pulse current control system for hydrogen production by water electrolysis is proposed, including a concentration monitoring module, an efficiency monitoring module, a pulse control module and a server. The concentration monitoring module, efficiency monitoring module and pulse control module are respectively connected to the server, and the server controls the concentration monitoring module, efficiency monitoring module and pulse control module respectively.

[0122] The concentration monitoring module periodically monitors the electrolyte concentration corresponding to each batch of hydrogen production in the sample and obtains the average deviation of the periodic concentration based on the monitoring results.

[0123] The batches of hydrogen production by water electrolysis that require pulse current regulation are obtained, resulting in multiple batches of hydrogen production by water electrolysis. Then, one sample batch of hydrogen production is randomly selected from the multiple batches of hydrogen production by water electrolysis.

[0124] During the process of monitoring the electrolyte concentration of the sample hydrogen production batch, the hydrogen production equipment corresponding to the sample hydrogen production batch is obtained, and the sample hydrogen production equipment is obtained.

[0125] The time point at which the electrolyte aqueous solution was injected into the sample hydrogen production equipment was obtained to obtain the start time point of the concentration cycle. The time point corresponding to the current moment was set as the end time point of the concentration cycle, and the time period between the start time point and the end time point of the concentration cycle was set as the electrolyte concentration monitoring cycle.

[0126] It should be noted here that:

[0127] In this application, the electrolyte referred to herein is sodium hydroxide, and the sample hydrogen production equipment referred to herein is an alkaline electrolyzer.

[0128] In this application, the sample hydrogen production equipment will not be replenished with water during the electrolyte concentration monitoring period.

[0129] Electrolyte concentration analysis was performed on the sample electrolysis equipment during the electrolyte concentration monitoring cycle, and the average deviation of the cycle concentration was obtained based on the analysis results.

[0130] Specifically as follows:

[0131] Obtain the original electrolyte concentration value, set a preset concentration change ratio, calculate the product of the original electrolyte concentration value and the preset concentration change ratio to obtain the preset electrolyte concentration value, and obtain the time point when the electrolyte concentration value corresponding to the sample electrolysis device reaches the preset electrolyte concentration value to obtain the preset concentration monitoring time point.

[0132] It should be noted here that:

[0133] In this application, the preset concentration change ratio is 99%.

[0134] Set the characteristic concentration duration to the time interval between the start time of the concentration cycle and the preset concentration monitoring time. Within the electrolyte concentration monitoring cycle, set a real-time concentration monitoring window. Use the real-time concentration monitoring window to iterate through the electrolyte concentration monitoring cycle to obtain real-time concentration change values ​​for multiple windows.

[0135] It should be noted here that:

[0136] In this application, the real-time concentration monitoring window referred to herein is specifically a sliding time segment for monitoring the electrolysis of the electrolysis equipment.

[0137] Electrolyte concentration changes were analyzed for the sample electrolysis equipment located within the real-time concentration monitoring window, and the real-time concentration change value of the window was obtained based on the analysis results.

[0138] Specifically as follows:

[0139] Several concentration monitoring points are set up inside the sample electrolysis equipment. The electrolyte concentration value corresponding to the start time of the concentration monitoring real-time window for each concentration monitoring point is acquired, and the average of the multiple electrolyte concentration values ​​is calculated to obtain the starting electrolyte concentration value. The electrolyte concentration value corresponding to the end time of the concentration monitoring real-time window for each concentration monitoring point is acquired, and the average of the multiple electrolyte concentration values ​​is calculated to obtain the ending electrolyte concentration value.

[0140] Calculate the difference between the initial electrolyte concentration and the final electrolyte concentration, and take the absolute value of the difference to obtain the real-time concentration change value of the window.

[0141] Set a preset value for real-time concentration change. If the real-time concentration change value of the window is greater than or equal to the preset value, the corresponding real-time concentration monitoring window will be set as a valid monitoring window. If the real-time concentration change value of the window is less than the preset value, the corresponding real-time concentration monitoring window will be set as an invalid monitoring window.

[0142] It should be noted here that:

[0143] In this application, the preset value for real-time concentration change is the minimum real-time concentration change value corresponding to the historical effective monitoring window.

[0144] Set the time period corresponding to the effective monitoring window as the N1 concentration change segment to the Na-1 concentration change segment, and set the corresponding segment concentration change value as the N1 segment concentration change value to the Na-1 segment concentration change value.

[0145] The volume of hydrogen produced by the sample electrolysis equipment from the N1 concentration change segment to the Na-1 concentration change segment is obtained to obtain the volume produced by the N1 segment to the Na-1 segment.

[0146] The theoretical change in electrolyte concentration of the sample electrolysis equipment during the N1 concentration change segment is obtained based on the N1 fragment preparation volume, thus obtaining the theoretical change in N1 concentration.

[0147] Specifically as follows:

[0148] Obtain the N1 electrolyte concentration value, obtain the mass of the aqueous solution corresponding to the beginning time point of the N1 concentration change segment of the sample electrolysis device, and obtain the N1 water mass value. Obtain the volume of hydrogen produced by the sample electrolysis device during the N1 concentration change segment, and obtain the N1 segment production volume.

[0149] Obtain the theoretical consumption of hydrogen-containing aqueous solution, calculate the product of the N1 fragment production volume and the theoretical consumption of hydrogen-containing aqueous solution, and obtain the theoretical mass of N1 aqueous solution consumed.

[0150] It should be noted here that:

[0151] In this application, the theoretical consumption of the hydrogen-producing aqueous solution is specifically 803.52, meaning that approximately 803.52 grams of water are required to produce 1 cubic meter of hydrogen.

[0152] The electrolyte mass corresponding to the start time point of the N1 concentration change segment of the sample electrolysis device was obtained to obtain the N1 electrolyte mass value. The electrolyte solution mass value corresponding to the start time point of the N1 concentration change segment of the sample electrolysis device was obtained to obtain the N1 electrolyte solution mass value.

[0153] The theoretical change in N1 concentration is obtained by calculating the mass values ​​of N1 electrolyte, N1 electrolytic solution, and the theoretical mass of N1 aqueous solution consumed.

[0154] The theoretical change in N1 concentration is calculated using the following formula:

[0155] ;

[0156] Wherein, Nbh1 is the theoretical change in N1 concentration, Zzl1 is the mass value of N1 electrolyte, Yzl1 is the mass value of N1 electrolyzed solution, and Yyz1 is the theoretical mass of N1 aqueous solution consumed;

[0157] Repeat the theoretical change value of N1 concentration to obtain the theoretical change value of electrolyte concentration for the sample electrolysis equipment in each concentration change segment, and obtain the theoretical change value of N2 concentration to the theoretical change value of Na-1 concentration;

[0158] Calculate the difference between the N1 fragment concentration change value and the theoretical N1 concentration change value, and calculate the deviation between the absolute value of the difference and the theoretical N1 concentration change value to obtain the N1 concentration change deviation degree. Similarly, calculate the difference between the Na-1 fragment concentration change value and the theoretical N2 concentration change value, and calculate the deviation between the absolute value of the difference and the theoretical Na-1 concentration change value to obtain the Na-1 concentration change deviation degree.

[0159] The average value of the deviation from N1 concentration change to Na-1 concentration change is calculated to obtain the average deviation of the periodic concentration.

[0160] The efficiency monitoring module analyzes the concentration change type of the sample hydrogen production batches based on the average deviation of the cycle concentration. Based on the analysis results, the sample hydrogen production batches are divided into solute normal batches and concentration abnormal batches. The hydrogen production efficiency of the solute normal batches is analyzed, and the hydrogen production rate of the cycle equipment is obtained based on the analysis results.

[0161] Specifically as follows:

[0162] The average deviation of the periodic concentration is obtained, and a reasonable deviation range for the periodic concentration is set. If the average deviation of the periodic concentration is within the reasonable deviation range, the hydrogen production batch of the sample is classified as a solute normal batch. If the average deviation of the periodic concentration is not within the reasonable deviation range, the hydrogen production batch of the sample is classified as a solute abnormal batch.

[0163] It should be noted here that:

[0164] In this application, the solute normal batch designation includes a periodic concentration average deviation within the periodic concentration reasonable deviation range, which is 0% to 5%.

[0165] Hydrogen production efficiency analysis was performed on normal batches of solute, and the hydrogen production rate of the cycle equipment was obtained based on the analysis results.

[0166] Specifically as follows:

[0167] In the process of analyzing the hydrogen production efficiency of normal batches of solute, the time point when the hydrogen production equipment of normal batches of solute starts working is set as the first rate analysis time point, the time point corresponding to the current moment is set as the second rate analysis time point, and the time between the first rate analysis time point and the second rate analysis time point is set as the hydrogen production rate monitoring cycle.

[0168] The volume of hydrogen produced by the hydrogen production equipment in the normal batch of solute during the hydrogen production rate monitoring cycle is obtained to obtain the cycle hydrogen production volume. The cycle duration corresponding to the hydrogen production rate monitoring cycle is obtained to obtain the hydrogen production cycle duration. The ratio of the cycle hydrogen production volume to the hydrogen production cycle duration is calculated to obtain the cycle equipment hydrogen production rate.

[0169] The pulse control module adjusts the pulse current of the solute normal batch hydrogen production equipment according to the hydrogen production rate of the cycle equipment.

[0170] Obtain the hydrogen production rate of the cycle equipment, obtain the preset range of the cycle hydrogen production rate, and obtain the upper limit and lower limit of the preset range of the cycle hydrogen production rate based on the preset range of the cycle hydrogen production rate.

[0171] It should be noted here that:

[0172] The preset range of the periodic hydrogen production rate involved here needs to be set by hydrogen production technicians based on the historical hydrogen production records of the hydrogen production equipment for normal batches of solute.

[0173] If the hydrogen production rate of the cycle equipment is greater than the upper limit of the preset range of cycle hydrogen production rate, the pulse current power is reduced until the hydrogen production rate of the cycle equipment is within the preset range of cycle hydrogen production rate.

[0174] If the hydrogen production rate of the cycle equipment is less than the lower limit of the preset range of cycle hydrogen production rate, the pulse current power is increased until the hydrogen production rate of the cycle equipment is within the preset range of cycle hydrogen production rate.

[0175] If the hydrogen production rate of the cycle equipment is within the preset range of the cycle hydrogen production rate, there is no need to adjust the power of the pulse current.

[0176] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A pulse current control method for hydrogen production by water electrolysis, characterized in that, include: Step S1: Monitor the electrolyte concentration corresponding to the sample hydrogen production batch, and obtain the average deviation of the periodic concentration based on the monitoring results; Step S2: Analyze the concentration change type of the sample hydrogen production batches based on the average deviation of the periodic concentration. Based on the analysis results, divide the sample hydrogen production batches into solute normal batches and concentration abnormal batches. Analyze the hydrogen production efficiency of the solute normal batches and obtain the hydrogen production rate of the periodic equipment based on the analysis results. Step S3: Adjust the pulse current of the hydrogen production equipment for normal batches of solute according to the hydrogen production rate of the cycle equipment.

2. The pulse current control method for hydrogen production by water electrolysis according to claim 1, characterized in that, Step S1 further includes the following steps: Step S11: Obtain a sample hydrogen production batch from the water electrolysis hydrogen production batch that requires pulse current regulation; Step S12: During the process of monitoring the electrolyte concentration of the sample hydrogen production batch, the hydrogen production equipment corresponding to the sample hydrogen production batch is obtained to obtain the sample hydrogen production equipment. Step S13: Obtain the time point of the last injection of electrolyte aqueous solution into the sample hydrogen production equipment to obtain the start time point of the concentration cycle, and set the time interval between the start time point of the concentration cycle and the current time as the electrolyte concentration monitoring cycle; Step S14: Perform electrolyte concentration analysis on the sample electrolysis equipment during the electrolyte concentration monitoring cycle, and obtain the average deviation of the cycle concentration based on the analysis results.

3. The pulse current control method for hydrogen production by water electrolysis according to claim 2, characterized in that, Step S14 further includes the following steps: Step S141: Obtain the original electrolyte concentration value, set a preset concentration change ratio, calculate the product of the original electrolyte concentration value and the preset concentration change ratio to obtain the preset electrolyte concentration value, and obtain the time point when the electrolyte concentration value corresponding to the sample electrolysis device reaches the preset electrolyte concentration value to obtain the preset concentration monitoring time point. Step S142: Set the time interval between the start time of the concentration cycle and the preset concentration monitoring time point as the characteristic concentration duration. Within the electrolyte concentration monitoring cycle, set a real-time concentration monitoring window. Use the real-time concentration monitoring window to iterate through the electrolyte concentration monitoring cycle to obtain multiple real-time concentration change values. Step S143: Analyze the electrolyte concentration change of the sample electrolysis device located in the real-time concentration monitoring window, and obtain the real-time concentration change value of the window based on the analysis results; Step S144: Set a preset value for real-time concentration change. If the real-time concentration change value of the window is greater than or equal to the preset value, then set the corresponding real-time concentration monitoring window as a valid monitoring window. If the real-time concentration change value of the window is less than the preset value, then set the corresponding real-time concentration monitoring window as an invalid monitoring window. Step S145: Set the time period corresponding to the effective monitoring window to the N1 concentration change segment to the Na-1 concentration change segment, and set the corresponding segment concentration change value to the N1 segment concentration change value to the Na-1 segment concentration change value. Step S146: Obtain the volume of hydrogen produced by the N1 concentration change segment to the Na-1 concentration change segment of the sample electrolysis equipment to obtain the volume produced by the N1 segment to the Na-1 segment. Step S147: Based on the N1 fragment preparation volume, obtain the theoretical change value of electrolyte concentration of the sample electrolysis equipment during the N1 concentration change segment, and obtain the theoretical change value of N1 concentration. Step S148: Repeat the theoretical change value of N1 concentration to obtain the theoretical change value of electrolyte concentration for the sample electrolysis device in each concentration change segment, and obtain the theoretical change value of N2 concentration to the theoretical change value of Na-1 concentration. Step S149: Calculate the difference between the N1 fragment concentration change value and the theoretical N1 concentration change value, and calculate the deviation between the absolute value of the difference and the theoretical N1 concentration change value to obtain the N1 concentration change deviation. Similarly, calculate the difference between the Na-1 fragment concentration change value and the theoretical N2 concentration change value, and calculate the deviation between the absolute value of the difference and the theoretical Na-1 concentration change value to obtain the Na-1 concentration change deviation. Calculate the average value of the N1 concentration change deviation to the Na-1 concentration change deviation to obtain the periodic concentration average deviation.

4. The pulse current control method for hydrogen production by water electrolysis according to claim 3, characterized in that, Step S143 further includes the following steps: Several concentration monitoring points are set up inside the sample electrolysis equipment. The electrolyte concentration value corresponding to the start time of the concentration monitoring real-time window for each concentration monitoring point is acquired, and the average of the multiple electrolyte concentration values ​​is calculated to obtain the starting electrolyte concentration value. The electrolyte concentration value corresponding to the end time of the concentration monitoring real-time window for each concentration monitoring point is acquired, and the average of the multiple electrolyte concentration values ​​is calculated to obtain the ending electrolyte concentration value. Calculate the difference between the starting and ending electrolyte concentration values, and take the absolute value of the difference to obtain the real-time concentration change value of the window.

5. A pulse current control method for hydrogen production by water electrolysis according to claim 3, characterized in that, Step S142 further includes the following steps: Several concentration monitoring points are set up inside the sample electrolysis equipment. The average value of the electrolyte concentration at each concentration monitoring point is calculated to obtain multiple electrolyte concentration values. Calculate the difference in electrolyte concentration between any two adjacent time points, and take the absolute value of the difference to obtain the concentration change values ​​for multiple time segments.

6. The pulse current control method for hydrogen production by water electrolysis according to claim 3, characterized in that, Step S147 further includes the following steps: Obtain the N1 electrolyte concentration value, obtain the mass of the aqueous solution corresponding to the beginning time point of the N1 concentration change segment of the sample electrolysis device, and obtain the N1 water mass value. Obtain the volume of hydrogen produced by the sample electrolysis device during the N1 concentration change segment, and obtain the N1 segment production volume. Obtain the theoretical consumption of hydrogen-containing aqueous solution, calculate the product of the N1 fragment production volume and the theoretical consumption of hydrogen-containing aqueous solution, and obtain the theoretical mass of N1 aqueous solution consumed. The electrolyte mass corresponding to the start time point of the N1 concentration change segment of the sample electrolysis device was obtained to obtain the N1 electrolyte mass value. The electrolyte solution mass value corresponding to the start time point of the N1 concentration change segment of the sample electrolysis device was obtained to obtain the N1 electrolyte solution mass value. The theoretical change in N1 concentration is obtained by calculating the mass values ​​of N1 electrolyte, N1 electrolyzed solution, and the theoretical mass of N1 aqueous solution consumed.

7. The pulse current control method for hydrogen production by water electrolysis according to claim 1, characterized in that, Step S2 further includes the following steps: Step S21: Obtain the average deviation of the periodic concentration, set a reasonable deviation range for the periodic concentration, classify the hydrogen production batch of samples whose average deviation of the periodic concentration is within the reasonable deviation range as solute normal batches, and classify the hydrogen production batch of samples whose average deviation of the periodic concentration is not within the reasonable deviation range as solute abnormal batches. Step S22: Perform hydrogen production efficiency analysis on normal batches of solute, and obtain the hydrogen production rate of the cycle equipment based on the analysis results.

8. A pulse current control method for hydrogen production by water electrolysis according to claim 7, characterized in that, Step S22 further includes the following steps: During the hydrogen production efficiency analysis of normal batches of solute, a hydrogen production rate monitoring cycle is set. The volume of hydrogen produced by the hydrogen production equipment in normal batches of solute during the hydrogen production rate monitoring cycle is obtained to obtain the cycle hydrogen production volume. The cycle duration corresponding to the hydrogen production rate monitoring cycle is obtained to obtain the hydrogen production cycle duration. The ratio of the cycle hydrogen production volume to the hydrogen production cycle duration is calculated to obtain the cycle equipment hydrogen production rate.

9. A pulse current control method for hydrogen production by water electrolysis according to claim 1, characterized in that, Step S3 further includes the following steps: Obtain the hydrogen production rate of the cycle equipment, obtain the preset range of the cycle hydrogen production rate, and obtain the upper limit and lower limit of the preset range of the cycle hydrogen production rate based on the preset range of the cycle hydrogen production rate. For electrolysis equipment whose cycle hydrogen production rate exceeds the upper limit of the preset range of cycle hydrogen production rate, the pulse current power is reduced until the cycle hydrogen production rate is within the preset range of cycle hydrogen production rate. If the hydrogen production rate of the cycle equipment is less than the lower limit of the preset range of cycle hydrogen production rate, the pulse current of the electrolysis equipment will be increased until the hydrogen production rate of the cycle equipment is within the preset range of cycle hydrogen production rate. If the hydrogen production rate of the cycle equipment is within the preset range of the cycle hydrogen production rate, there is no need to adjust the power of the pulse current.

10. A pulse current control system for hydrogen production by water electrolysis, applicable to the pulse current control method for hydrogen production by water electrolysis as described in any one of claims 1-9, characterized in that, The pulse current regulation system includes: Concentration monitoring module: Monitors the electrolyte concentration corresponding to the sample hydrogen production batch and obtains the average deviation of the periodic concentration based on the monitoring results; Efficiency monitoring module: Analyzes the concentration change type of sample hydrogen production batches based on the average deviation of the cycle concentration, classifies the sample hydrogen production batches into solute normal batches and concentration abnormal batches based on the analysis results, analyzes the hydrogen production efficiency of solute normal batches, and obtains the hydrogen production rate of the cycle equipment based on the analysis results. Pulse control module: Adjusts the pulse current of the hydrogen production equipment for normal batches of solute according to the hydrogen production rate of the cycle equipment.

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