Hydrogen production system purging method and device, hydrogen production system and machine readable storage medium

Abstract

The invention discloses a hydrogen production system purging method and device, a hydrogen production system and a machine readable storage medium, and relates to the technical field of new energy. The method comprises the following steps: determining a purging mode based on a hydrogen production stage of the hydrogen production system; determining a target volume based on the hydrogen production phase, the target volume comprising a volume within the separation system and / or the purification system; based on the gas state parameters, the gas material balance principle and the purging mode, a first corresponding relation is determined, and the first corresponding relation is the corresponding relation among the purging flow, the purging time and the target volume; purge control parameters are determined in the purge mode based on the target volume, the first corresponding relation and preset parameters, and the preset parameters comprise preset time parameters or preset flow parameters; and purging is carried out in the hydrogen production stage based on the purging control parameters. By introducing the preset time parameter or the preset flow parameter, the purging operation is flexibly adjusted based on actual requirements, and unnecessary resource waste is avoided.

Description

Technical Field

[0001] The present application relates to the field of new energy technologies, and particularly to a purging method and device for a hydrogen production system, a hydrogen production system, and a machine-readable storage medium. Background Art

[0002] With the increasing global emphasis on clean energy and sustainable development, hydrogen energy, as an efficient and clean energy carrier, has an increasingly broad application prospect. In many fields such as industrial production and transportation, hydrogen energy is gradually replacing traditional fossil fuels and becoming an important force in promoting the transformation of the energy structure. As one of the current mainstream hydrogen production methods, the water electrolysis hydrogen production technology separates hydrogen ions and oxygen ions in water by electrolyzing water, and then generates hydrogen and oxygen, which has the advantages of rich raw materials, pure products, and environmental friendliness.

[0003] However, the safe operation problem of the water electrolysis hydrogen production system cannot be ignored. During the hydrogen production process, since hydrogen and oxygen are flammable and explosive gases, if the gas mixing ratio in the system reaches the explosion limit and encounters a fire source or high temperature, an explosion accident may occur, posing a serious threat to personnel and equipment. Especially in the two key stages of startup and shutdown, due to the conversion of the system state and the replacement of gases, safety hazards are more likely to occur. Therefore, how to perform reliable gas purging during the hydrogen production process is of great significance for ensuring the safe operation of the water electrolysis hydrogen production system. Summary of the Invention

[0004] In view of the above deficiencies in the prior art, the purpose of the embodiments of the present application is to provide a purging method and device for a hydrogen production system, a hydrogen production system, and a machine-readable storage medium.

[0005] To achieve the above purpose, the first aspect of the present application provides a purging method for a hydrogen production system, which is applied to a hydrogen production system. The hydrogen production system includes a nitrogen purging device, an electrolyzer, a separation system, and a purification system connected in sequence. The nitrogen purging device is connected to the separation system and the purification system respectively. The purging method for the hydrogen production system includes:

[0006] Determine a purging mode based on the hydrogen production stage of the hydrogen production system, where the purging mode includes a startup purging mode, a pre-hydrogen production purging mode, and a shutdown purging mode;

[0007] Determine a target volume based on the hydrogen production stage, where the target volume includes the volume in the separation system and / or the purification system;

[0008] Determine a first corresponding relationship based on gas state parameters, the gas material balance principle, and the purging mode, where the first corresponding relationship is the corresponding relationship among the purging flow rate, the purging time, and the target volume;

[0009] Determine purge control parameters in the purge mode based on the target volume, the first correspondence, and preset parameters, where the preset parameters include a preset time parameter or a preset flow parameter;

[0010] Perform purging during the hydrogen production stage based on the purge control parameters.

[0011] In the embodiments of the present application, determining the first correspondence based on gas state parameters, the gas material balance principle, and the purge mode includes:

[0012] When the purge mode is the startup purge mode, determine a second correspondence based on the oxygen material balance principle, the initial oxygen volume fraction, and the oxygen concentration threshold, where the second correspondence is the correspondence between the purge nitrogen molar flow rate, the molar amount of the gas stored in the system, and the purge time;

[0013] Determine a third correspondence based on gas state parameters, where the gas state parameters include gas temperature and absolute gas pressure, and the third correspondence is the correspondence between the target volume and the molar amount of the gas stored in the system, and the molar amount of the gas stored in the system includes the molar amount of the gas stored in the separation system or the molar amount of the gas stored in the purification system;

[0014] Determine a fourth correspondence based on gas state parameters, where the fourth correspondence is the correspondence between the purge nitrogen molar flow rate and the nitrogen purge flow rate;

[0015] Determine the first correspondence based on the second correspondence, the third correspondence, and the fourth correspondence, where the purge flow rate in the first correspondence is the nitrogen purge flow rate.

[0016] In the embodiments of the present application, determining the first correspondence based on gas state parameters, the gas material balance principle, and the purge mode includes:

[0017] When the purge mode is the pre-hydrogen production purge mode, determine a fifth correspondence based on the nitrogen material balance principle, the initial nitrogen volume fraction, and the nitrogen concentration threshold, where the fifth correspondence is the correspondence between the purge hydrogen molar flow rate, the molar amount of the gas stored in the system, and the purge time, and the molar amount of the gas stored in the system is the total molar amount of the gas stored in the separation system and the purification system;

[0018] Determine a sixth correspondence based on gas state parameters, where the gas state parameters include gas temperature and absolute gas pressure, and the sixth correspondence is the correspondence between the target volume and the molar amount of the gas stored in the system;

[0019] Determine the first correspondence based on the fifth correspondence and the sixth correspondence, where the purge flow rate in the first correspondence is the purge hydrogen molar flow rate.

[0020] In the embodiments of the present application, determining the first correspondence relationship based on gas state parameters, the gas material balance principle, and the purge mode includes:

[0021] When the purge mode is the shutdown purge mode, determining the seventh correspondence relationship based on the hydrogen material balance principle, the initial hydrogen volume fraction, and the hydrogen concentration threshold, where the seventh correspondence relationship is the correspondence relationship among the purge nitrogen molar flow rate, the molar amount of the gas stored in the system, and the purge time, and the molar amount of the gas stored in the system includes the molar amount of the gas stored in the separation system or the molar amount of the gas stored in the purification system;

[0022] Determining the eighth correspondence relationship based on the gas state parameters, where the gas state parameters include the gas temperature and the absolute gas pressure, and the eighth correspondence relationship is the correspondence relationship between the target volume and the molar amount of the gas stored in the system;

[0023] Determining the ninth correspondence relationship based on the gas state parameters, where the ninth correspondence relationship is the correspondence relationship between the purge nitrogen molar flow rate and the nitrogen purge flow rate;

[0024] Determining the first correspondence relationship based on the seventh correspondence relationship, the eighth correspondence relationship, and the ninth correspondence relationship, where the purge flow rate in the first correspondence relationship is the nitrogen purge flow rate.

[0025] In the embodiments of the present application, determining the target volume based on the hydrogen production stage includes:

[0026] When the hydrogen production stage is the startup stage, determining the target volume as the volume in the separation system or the volume in the purification system;

[0027] When the hydrogen production stage is the pre-hydrogen production stage, determining the target volume as the total volume in the separation system and the purification system;

[0028] When the hydrogen production stage is the shutdown stage, determining the target volume as the volume in the separation system or the volume in the purification system.

[0029] In the embodiments of the present application, the hydrogen production system further includes an exhaust port and a hydrogen outlet. The nitrogen purge device includes a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a first flowmeter, a second flowmeter, and a nitrogen supply unit. The nitrogen supply unit is sequentially connected to the inlet of the separation system through the first valve, the second valve, and the first flowmeter. The nitrogen supply unit is also sequentially connected to the third valve, the fourth valve, the second flowmeter, and the inlet of the purification system. The outlet of the separation system is connected to the inlet of the purification system through the fifth valve. The outlet of the separation system is also connected to the exhaust port through the sixth valve. The outlet of the purification system is respectively connected to the hydrogen outlet through the seventh valve and to the exhaust port through the eighth valve;

[0030] Perform purging during the hydrogen production stage based on purging control parameters, including:

[0031] When the hydrogen production stage is the startup stage, open the first valve, the third valve, the sixth valve, and the eighth valve, close the fifth valve and the seventh valve, and control the opening degrees of the second valve and the fourth valve based on the purging control parameters;

[0032] When the hydrogen production stage is the pre-hydrogen production stage, open the fifth valve and the eighth valve, close the sixth valve and the seventh valve, and determine the target purging load current value of the electrolyzer based on the purging control parameters, so that the hydrogen electrolyzed by the electrolyzer based on the target purging load current value enters the separation system;

[0033] When the hydrogen production stage is the shutdown stage, open the first valve, the third valve, the sixth valve, and the eighth valve, close the fifth valve and the seventh valve, and control the opening degrees of the second valve and the fourth valve based on the purging control parameters.

[0034] In the embodiments of the present application, when the hydrogen production stage is the shutdown stage, open the first valve, the third valve, the sixth valve, and the eighth valve, close the fifth valve and the seventh valve, and control the opening degrees of the second valve and the fourth valve based on the purging control parameters, including:

[0035] When the hydrogen production stage is the shutdown stage, open the sixth valve and the eighth valve, close the sixth valve until the pressure in the separation system reaches the first preset pressure, and close the eighth valve until the pressure in the purification system reaches the second preset pressure;

[0036] Open the first valve, the third valve, the sixth valve, and the eighth valve, close the fifth valve and the seventh valve, and control the opening degrees of the second valve and the fourth valve based on the purging control parameters.

[0037] The second aspect of the present application provides a purging device for a hydrogen production system, including:

[0038] A memory configured to store instructions;

[0039] A processor configured to call instructions from the memory and be able to implement the purging method of the hydrogen production system as described in the above embodiments when executing the instructions.

[0040] The third aspect of the present application provides a hydrogen production system, including:

[0041] The purging device for a hydrogen production system as described in the above embodiments;

[0042] An electrolyzer, a separation system, and a purification system connected in sequence;

[0043] A nitrogen purging device connected to the separation system and the purification system respectively.

[0044] In the embodiment of the present application, the hydrogen production system further includes an exhaust port and a hydrogen outlet;

[0045] The nitrogen purging device includes a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a first flowmeter, a second flowmeter, and a nitrogen supply unit. The nitrogen supply unit is sequentially connected to the first valve, the second valve, the first flowmeter, and the inlet of the separation system. The nitrogen supply unit is also sequentially connected to the third valve, the fourth valve, the second flowmeter, and the inlet of the purification system. The outlet of the separation system is respectively connected to the inlet of the purification system through the fifth valve and to the exhaust port through the sixth valve. The outlet of the purification system is respectively connected to the hydrogen outlet through the seventh valve and to the exhaust port through the eighth valve.

[0046] The fourth aspect of the present application provides a machine-readable storage medium, on which instructions are stored for causing a machine to execute the hydrogen production system purging method as described in the above embodiment.

[0047] Through the above technical solutions, the purging mode is determined based on the hydrogen production stage of the hydrogen production system, where the purging mode includes a startup purging mode, a pre-hydrogen production purging mode, and a shutdown purging mode; the appropriate purging mode is selected according to the specific operating state of the hydrogen production system to reduce unnecessary purging operations and improve the efficiency of the entire hydrogen production process. The target volume is determined based on the hydrogen production stage, and the target volume includes the volume in the separation system and / or the purification system; the target volume of purging is clarified to ensure the pertinence and effectiveness of the purging operation. Based on the gas state parameters, the gas material balance principle, and the purging mode, a first correspondence is determined, where the first correspondence is the correspondence between the purging flow rate, the purging time, and the target volume; based on the target volume, the first correspondence, and the preset parameters, the purging control parameters are determined in the purging mode, where the preset parameters include preset time parameters or preset flow parameters; purging is performed in the hydrogen production stage based on the purging control parameters. By introducing preset time parameters or preset flow parameters, the purging operation can be flexibly adjusted based on actual needs to avoid unnecessary resource waste.

[0048] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used together with the following specific implementation to explain the embodiments of the present application, but do not constitute a limitation to the embodiments of the present application. In the drawings:

[0050] Figure 1 A schematic flow diagram of a hydrogen production system purging method according to an embodiment of the present application is schematically shown;

[0051] Figure 2 Schematically shows a schematic structural diagram of a hydrogen production system according to an embodiment of the present application.

[0052] Description of reference numerals

[0053] 100, nitrogen purging device; 200, electrolytic cell; 300, separation system; 400, purification system; 500, exhaust port; 600, hydrogen outlet; 101, first valve; 102, second valve; 103, third valve; 104, fourth valve; 105, fifth valve; 106, sixth valve; 107, seventh valve; 108, eighth valve; 110, first flowmeter; 120, second flowmeter; 130, nitrogen supply unit. Detailed implementation manners

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0055] It should be noted that the acquisition, transmission, storage, use, processing, etc. of data in the technical solutions of the present application all comply with the relevant regulations of national laws and regulations. In the embodiments of the present application, some industry-existing solutions such as certain software, components, models, etc. may be mentioned. They should be regarded as exemplary, and their purpose is only to illustrate the feasibility in the implementation of the technical solutions of the present application, but it does not mean that the applicant has already or necessarily used this solution.

[0056] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0057] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments may be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0058] Figure 1 Schematically shows a flowchart of a purging method for a hydrogen production system according to an embodiment of the present application. As Figure 1 shown, the embodiment of the present application provides a purging method for a hydrogen production system, which is applied to the hydrogen production system. Referring to Figure 2 , the hydrogen production system includes a nitrogen purging device 100, an electrolyzer 200, a separation system 300, and a purification system 400 connected in sequence. The nitrogen purging device 100 is respectively connected to the separation system 300 and the purification system 400. The purging method for the hydrogen production system may include the following steps:

[0059] Step 100, determining a purging mode based on the hydrogen production stage in which the hydrogen production system is located, where the purging mode includes a startup purging mode, a pre-hydrogen production purging mode, and a shutdown purging mode;

[0060] It should be noted that as one of the current mainstream hydrogen production methods, the water electrolysis hydrogen production technology separates hydrogen ions and oxygen ions in water by electrolyzing water, and then generates hydrogen and oxygen, which has the advantages of rich raw materials, pure products, and environmental friendliness. However, the safe operation problem of the water electrolysis hydrogen production system cannot be ignored. During the hydrogen production process, since hydrogen and oxygen are flammable and explosive gases, if the gas mixing ratio in the system reaches the explosion limit, once encountering a fire source or high temperature, an explosion accident may occur, posing a serious threat to personnel and equipment.

[0061] In this embodiment, the hydrogen production system includes a nitrogen purging device, an electrolytic cell, a separation system, and a purification system that are connected in sequence. The nitrogen purging device is connected to the separation system and the purification system respectively. Analyzing the gases in the hydrogen production system during operation, it is found that when the hydrogen production system is started for the first time, or after being placed for a long time and then started, or after maintenance and then started for the first time, there will be residual air in the hydrogen production system. The mixture of this residual air and hydrogen may form explosive gases, increasing the safety risk. When the hydrogen production system starts to produce hydrogen, if the hydrogen in the hydrogen production system is impure and there are miscellaneous gases, it will affect the purity of the produced hydrogen. After the hydrogen production system stops, if there is still residual hydrogen in the hydrogen production system, it is also extremely likely to form a hazard source. Therefore, in this embodiment, the hydrogen production stage includes a startup stage, a pre-hydrogen production stage, and a shutdown stage. Among them, the startup stage refers to the stage when the hydrogen production system is started for the first time, or after being placed for a long time and then started, or after maintenance and then started for the first time; the pre-hydrogen production stage refers to the stage before the hydrogen production system starts to produce hydrogen; the shutdown stage refers to the stage when the hydrogen production system stops.

[0062] In this embodiment, a corresponding purging mode is determined according to the hydrogen production stage of the hydrogen production system. Among them, the purging mode includes a startup purging mode, a pre-hydrogen production purging mode, and a shutdown purging mode. Specifically, the startup stage corresponds to the startup purging mode; the pre-hydrogen production stage corresponds to the pre-hydrogen production purging mode; the shutdown stage corresponds to the shutdown purging mode. That is, for each hydrogen production stage of the hydrogen production system, gas purging is carried out based on different purging modes to reduce the safety risk and improve the hydrogen production purity.

[0063] Step 200, determining a target volume based on the hydrogen production stage, where the target volume includes the volume in the separation system and / or the purification system;

[0064] It should be noted that the purging modes adopted for different hydrogen production stages are different. In this embodiment, the characteristics and purging time of different hydrogen production stages are comprehensively considered to save the purging time to the greatest extent while completing the purging task and improve the system operation efficiency. In this embodiment, the separation system and the purification system of the hydrogen production system are purged separately or together corresponding to different hydrogen production stages. For different purging methods, the volume that the gas purging needs to cover is also different.

[0065] Specifically, in one embodiment, determining a target volume based on the hydrogen production stage, where the target volume includes the volume in the separation system and / or the purification system, includes:

[0066] When the hydrogen production stage is the startup stage, determining the target volume as the volume in the separation system or the volume in the purification system;

[0067] When the hydrogen production stage is the pre-hydrogen production stage, determining the target volume as the total volume in the separation system and the purification system;

[0068] When the hydrogen production stage is the shutdown stage, determine the target volume as the volume within the separation system or the volume within the purification system.

[0069] In this embodiment, during the startup stage, since the system has just changed from the shutdown state to the operating state, it is necessary to ensure that there are no residual impure gases or impurities in the system to avoid affecting the subsequent hydrogen production efficiency and product quality. It is possible to choose to purge the separation system and the purification system separately or together. In this embodiment, in order to shorten the system startup time, priority is given to purging the separation system and the purification system separately and starting the purging simultaneously to more precisely control the purging process and effect. At this stage, determine the target volume as the volume within the separation system or the volume within the purification system. Among them, when the target volume is the volume within the separation system, the target volume can be used to calculate the control parameters for purging the separation system during the startup stage; when the target volume is the volume within the purification system, the target volume can be used to calculate the control parameters for purging the purification system during the startup stage.

[0070] Before the hydrogen production stage, the system is already in a ready state and is about to start the formal hydrogen production process. To ensure the cleanliness and safety of the entire system, it is usually necessary to conduct a comprehensive purge of the entire system. In this embodiment, during the pre-hydrogen production stage, the separation system and the purification system are purged together to ensure that there are no residual impure gases or impurities in the system. At this stage, determine the target volume as the total volume within the separation system and the purification system.

[0071] During the shutdown stage, the system needs to change from the operating state to the shutdown state. At this time, to ensure that there are no residual hydrogen or other harmful gases in the system, it is necessary to purge the hydrogen production system. It is possible to choose to purge the separation system and the purification system separately or together. In this embodiment, in order to shorten the system shutdown time, priority is given to purging the separation system and the purification system separately to facilitate the maintenance and repair of each system after shutdown. At this stage, determine the target volume as the volume within the separation system or the volume within the purification system. At this stage, determine the target volume as the volume within the separation system or the volume within the purification system. Among them, when the target volume is the volume within the separation system, the target volume can be used to calculate the control parameters for purging the separation system during the startup stage; when the target volume is the volume within the purification system, the target volume can be used to calculate the control parameters for purging the purification system during the startup stage.

[0072] Step 300, based on the gas state parameters, the gas material balance principle, and the purging mode, determine the first correspondence relationship, where the first correspondence relationship is the correspondence relationship among the purging flow rate, the purging time, and the target volume;

[0073] It should be noted that according to the principle of gas material balance, the total amount of gas entering the system during the purging process should be equal to the total amount of gas discharged from the system. The purging flow rate multiplied by the purging time should be equal to the total amount of gas replaced within the target volume. However, considering the change in gas state, the gas state equation needs to be introduced for correction. The first corresponding relationship is the relationship among the purging flow rate, purging time, and target volume. To determine this first corresponding relationship, comprehensive analysis and calculation need to be carried out based on gas state parameters, the principle of gas material balance, and the purging mode. In one embodiment, the corresponding relationship among the optimal purging flow rate, time, and target volume can be determined through experiments or simulations to ensure that the purging effect meets the expectations.

[0074] Step 400, determine the purging control parameters in the purging mode based on the target volume, the first corresponding relationship, and the preset parameters, where the preset parameters include a preset time parameter or a preset flow parameter;

[0075] Step 500, perform purging during the hydrogen production stage based on the purging control parameters.

[0076] It should be noted that the preset parameters can be a preset time parameter or a preset flow parameter. Which parameter to choose depends on the characteristics of the system and the actual operation requirements. If the hydrogen production system has strict requirements for the purging time, or it is difficult to accurately control the purging flow rate, the preset parameter can be selected as the preset time parameter. At this time, a reasonable purging time needs to be determined, and then the required purging flow rate can be calculated according to the first corresponding relationship. If the hydrogen production system can accurately control the purging flow rate, or has a high requirement for the stability of the purging flow rate, the preset parameter can be selected as the preset flow parameter. At this time, a suitable purging flow rate needs to be determined, and then the required purging time can be calculated according to the first corresponding relationship. The purging control parameters include the purging flow rate or the purging time. According to the target volume, the first corresponding relationship, and the preset parameters, the purging control parameters are calculated. If the preset time parameter is selected, the required purging flow rate is calculated; if the preset flow parameter is selected, the required purging time is calculated.

[0077] In this embodiment, the purging mode is determined based on the hydrogen production stage of the hydrogen production system. The purging mode includes a startup purging mode, a pre-hydrogen production purging mode, and a shutdown purging mode. By selecting a suitable purging mode according to the specific operating state of the hydrogen production system, unnecessary purging operations are reduced, and the efficiency of the entire hydrogen production process is improved. The target volume is determined based on the hydrogen production stage. The target volume includes the volume within the separation system and / or the purification system. Defining the target volume of purging ensures the pertinence and effectiveness of the purging operation. Based on the gas state parameters, the gas material balance principle, and the purging mode, a first correspondence is determined. The first correspondence is the correspondence between the purging flow rate, the purging time, and the target volume. Based on the target volume, the first correspondence, and the preset parameters, the purging control parameters are determined in the purging mode. The preset parameters include preset time parameters or preset flow parameters. Purging is performed in the hydrogen production stage based on the purging control parameters. By introducing preset time parameters or preset flow parameters, the purging operation can be flexibly adjusted based on actual requirements, avoiding unnecessary resource waste.

[0078] In one embodiment, determining the first correspondence based on the gas state parameters, the gas material balance principle, and the purging mode includes:

[0079] In the case where the purging mode is the startup purging mode, a second correspondence is determined based on the oxygen material balance principle, the initial oxygen volume fraction, and the oxygen concentration threshold. The second correspondence is the correspondence between the purging nitrogen molar flow rate, the system storage gas molar amount, and the purging time.

[0080] Specifically, based on the oxygen material balance principle, it can be obtained that:

[0081]

[0082] where n1 represents the storage gas molar amount of the separation system or the purification system, unit: mol; x1 represents the initial oxygen volume fraction, which can take the value of 0.21 in the startup purging mode; t represents the purging time, unit: min; N1 in represents the purging nitrogen molar flow rate, unit: mol / min.

[0083] Integrating the above formula to solve the change of the oxygen volume fraction with the purging time, and paying attention to the oxygen concentration decreasing from the initial oxygen volume fraction of 0.21 to the oxygen concentration threshold. According to the existing standard, it is qualified to reduce the oxygen concentration in the separation system or the purification system to 0.5% by nitrogen purging. In this embodiment, the oxygen concentration threshold is taken as 0.005, and it can be obtained that:

[0084]

[0085] Among them, n1 represents the molar amount of stored gas in the separation system or the molar amount of stored gas in the purification system, unit: mol; x1 represents the initial volume fraction of oxygen; t represents the purging time, unit: min; N1 in represents the molar flow rate of purging nitrogen, unit: mol / min.

[0086] Furthermore, the second corresponding relationship can be determined as:

[0087]

[0088] Among them, n1 represents the molar amount of stored gas in the separation system or the molar amount of stored gas in the purification system, unit: mol; t represents the purging time, unit: min; N1 in represents the molar flow rate of purging nitrogen, unit: mol / min.

[0089] Based on the gas state parameters, a third corresponding relationship is determined. Among them, the gas state parameters include gas temperature and absolute gas pressure. The third corresponding relationship is the corresponding relationship between the target volume and the molar amount of stored gas in the system. The molar amount of stored gas in the system includes the molar amount of stored gas in the separation system or the molar amount of stored gas in the purification system;

[0090] It should be noted that the gas temperature can be detected by a temperature sensor in the separation system or the purification system; the absolute gas pressure can be detected by a pressure sensor in the separation system or the purification system. Specifically, the third corresponding relationship can be expressed as:

[0091]

[0092] Among them, n1 represents the molar amount of stored gas in the separation system or the molar amount of stored gas in the purification system, unit: mol; V1 represents the target volume, unit: L. The target volume during the startup stage is the volume in the separation system or the volume in the purification system; T represents the gas temperature, unit: °C; P represents the absolute gas pressure, unit: barg.

[0093] Based on the gas state parameters, a fourth corresponding relationship is determined. Among them, the fourth corresponding relationship is the corresponding relationship between the molar flow rate of purging nitrogen and the nitrogen purging flow rate;

[0094] The third corresponding relationship can be expressed as:

[0095]

[0096] Among them, N1 in represents the molar flow rate of purging nitrogen, unit: mol / min; M1 in represents the nitrogen purging flow rate, unit: L / min; T represents the gas temperature, unit: °C; P represents the absolute gas pressure, unit: barg.

[0097] Determine the first correspondence based on the second correspondence, the third correspondence, and the fourth correspondence, where the purging flow rate in the first correspondence is the nitrogen purging flow rate.

[0098] In this embodiment, by combining the second correspondence, the third correspondence, and the fourth correspondence, the relationship among the nitrogen purging flow rate, the molar amount of the gas stored in the system, and the purging time in the startup purging mode can be obtained.

[0099] For the separation system, when the purging time is determined, combine the volume in the separation system, the molar amount of the stored gas in the separation system, and this first correspondence to determine the nitrogen purging flow rate for purging the separation system; when the nitrogen purging flow rate is determined, combine the volume in the separation system, the molar amount of the stored gas in the separation system, and this first correspondence to determine the purging time for purging the separation system.

[0100] For the purification system, when the purging time is determined, combine the volume in the purification system, the molar amount of the stored gas in the purification system, and this first correspondence to determine the nitrogen purging flow rate for purging the purification system; when the nitrogen purging flow rate is determined, combine the volume in the purification system, the molar amount of the stored gas in the purification system, and this first correspondence to determine the purging time for purging the purification system.

[0101] In one embodiment, determine the first correspondence based on the gas state parameters, the gas material balance principle, and the purging mode, including:

[0102] When the purging mode is the pre-hydrogen production purging mode, determine the fifth correspondence based on the nitrogen material balance principle, the initial nitrogen volume fraction, and the nitrogen concentration threshold, where the fifth correspondence is the correspondence among the purging hydrogen molar flow rate, the molar amount of the gas stored in the system, and the purging time, and the molar amount of the gas stored in the system is the total molar amount of the gas stored in the separation system and the purification system;

[0103] Specifically, based on the nitrogen material balance principle, it can be obtained that:

[0104]

[0105] Among them, n2 represents the total molar amount of the gas stored in the separation system and the purification system, unit: mol; x2 represents the initial nitrogen volume fraction, which can take the value of 1 in the pre-hydrogen production purging mode; t represents the purging time, unit: min; H in represents the purging hydrogen molar flow rate, unit: mol / min.

[0106] Integrate the above formula to solve for the change in the nitrogen volume fraction with the purging time, and pay attention to the nitrogen concentration decreasing from the initial oxygen volume fraction of 1 to the nitrogen concentration threshold. In this embodiment, the nitrogen concentration threshold is taken as x0, and the following can be obtained:

[0107]

[0108] where n2 represents the total number of moles of stored gas in the separation system and the purification system, unit: mol; x2 represents the initial nitrogen volume fraction; t represents the purging time, unit: min; H in represents the molar flow rate of purging hydrogen, unit: mol / min.

[0109] Furthermore, the fifth corresponding relationship can be determined as:

[0110]

[0111] where n2 represents the total number of moles of stored gas in the separation system and the purification system, unit: mol; t represents the purging time, unit: min; H in represents the molar flow rate of purging hydrogen, unit: mol / min.

[0112] Based on the gas state parameters, the sixth corresponding relationship is determined. The gas state parameters include the gas temperature and the absolute gas pressure. The sixth corresponding relationship is the corresponding relationship between the target volume and the total number of moles of stored gas in the system;

[0113] It should be noted that the gas temperature can be detected by a temperature sensor in the separation system or the purification system; the absolute gas pressure can be detected by a pressure sensor in the separation system or the purification system. Specifically, the sixth corresponding relationship can be expressed as:

[0114]

[0115] where n2 represents the total number of moles of stored gas in the separation system and the purification system, unit: mol; V2 represents the target volume, unit: L. The target volume in the pre-hydrogen production stage is the total volume in the separation system and the purification system; T represents the gas temperature, unit: °C; P represents the absolute gas pressure, unit: barg.

[0116] Based on the fifth corresponding relationship and the sixth corresponding relationship, the first corresponding relationship is determined. The purging flow rate in the first corresponding relationship is the molar flow rate of purging hydrogen.

[0117] In this embodiment, by combining the fifth corresponding relationship and the sixth corresponding relationship, the relationship between the molar flow rate of purging hydrogen, the total number of moles of stored gas in the system, and the purging time in the pre-hydrogen production purging mode can be obtained.

[0118] For the separation system and the purification system, when the purging time is determined, the purging hydrogen molar flow rate for purging the separation system and the purification system is determined by combining the total volume in the separation system and the purification system, the total stored gas molar amount of the separation system and the purification system, and this first correspondence; when the purging hydrogen molar flow rate is determined, the total volume in the separation system and the purification system, the total stored gas molar amount of the separation system and the purification system, and this first correspondence determine the purging time for purging the separation system and the purification system.

[0119] In one embodiment, based on the gas state parameters, the gas material balance principle, and the purging mode, the first correspondence is determined, including:

[0120] When the purging mode is the shutdown purging mode, the seventh correspondence is determined based on the hydrogen material balance principle, the initial hydrogen volume fraction, and the hydrogen concentration threshold, where the seventh correspondence is the correspondence between the purging nitrogen molar flow rate, the system stored gas molar amount, and the purging time, and the system stored gas molar amount includes the stored gas molar amount of the separation system or the stored gas molar amount of the purification system;

[0121] Specifically, based on the hydrogen material balance principle, it can be obtained that:

[0122]

[0123] Among them, n3 represents the stored gas molar amount of the separation system or the purification system, unit: mol; x3 represents the initial hydrogen volume fraction, which can take the value of 1 in the shutdown purging mode; t represents the purging time, unit: min; N2 in represents the purging nitrogen molar flow rate, unit: mol / min.

[0124] Integrate the above formula to solve the change of the hydrogen volume fraction with the purging time, and pay attention to the hydrogen concentration decreasing from the initial hydrogen volume fraction of 1 to the hydrogen concentration threshold. Among them, according to the existing standard, it is qualified to purge the separation system or the purification system with nitrogen so that the hydrogen concentration in the system drops to 0.5%. In this embodiment, the hydrogen concentration threshold takes the value of 0.005, and it can be obtained that:

[0125]

[0126] Among them, n3 represents the stored gas molar amount of the separation system or the purification system, unit: mol; x3 represents the initial hydrogen volume fraction; t represents the purging time, unit: min; N2 in represents the purging nitrogen molar flow rate, unit: mol / min.

[0127] Furthermore, the seventh correspondence can be determined as:

[0128]

[0129] Among them, n3 represents the molar amount of stored gas in the separation system or the purification system, unit: mol; t represents the purging time, unit: min; N3 in represents the molar flow rate of purging nitrogen, unit: mol / min.

[0130] Determine the eighth corresponding relationship based on the gas state parameters, where the gas state parameters include gas temperature and absolute gas pressure, and the eighth corresponding relationship is the corresponding relationship between the target volume and the molar amount of stored gas in the system;

[0131] It should be noted that the gas temperature can be detected by a temperature sensor in the separation system or the purification system; the absolute gas pressure can be detected by a pressure sensor in the separation system or the purification system. Specifically, the eighth corresponding relationship can be expressed as:

[0132]

[0133] Among them, n3 represents the molar amount of stored gas in the separation system or the purification system, unit: mol; V3 represents the target volume, unit: L, and the target volume in the shutdown stage is the volume in the separation system or the purification system; T represents the gas temperature, unit: °C; P represents the absolute gas pressure, unit: barg.

[0134] Determine the ninth corresponding relationship based on the gas state parameters, where the ninth corresponding relationship is the corresponding relationship between the molar flow rate of purging nitrogen and the nitrogen purging flow rate;

[0135] The ninth corresponding relationship can be expressed as:

[0136]

[0137] Among them, N2 in represents the molar flow rate of purging nitrogen, unit: mol / min; M2 in represents the nitrogen purging flow rate, unit: L / min; T represents the gas temperature, unit: °C; P represents the absolute gas pressure, unit: barg.

[0138] Determine the first corresponding relationship based on the seventh corresponding relationship, the eighth corresponding relationship and the ninth corresponding relationship, where the purging flow rate in the first corresponding relationship is the nitrogen purging flow rate.

[0139] In this embodiment, by combining the seventh corresponding relationship, the eighth corresponding relationship and the ninth corresponding relationship, the relationship between the nitrogen purging flow rate, the molar amount of stored gas in the system and the purging time in the shutdown purging mode can be obtained.

[0140] For the separation system, when determining the purging time, the nitrogen purging flow rate for purging the separation system is determined by combining the volume within the separation system, the molar amount of the stored gas in the separation system, and this first corresponding relationship; when determining the nitrogen purging flow rate, the purging time for purging the separation system is determined by combining the volume within the separation system, the molar amount of the stored gas in the separation system, and this first corresponding relationship.

[0141] For the purification system, when determining the purging time, the nitrogen purging flow rate for purging the purification system is determined by combining the volume within the purification system, the molar amount of the stored gas in the purification system, and this first corresponding relationship; when determining the nitrogen purging flow rate, the purging time for purging the purification system is determined by combining the volume within the purification system, the molar amount of the stored gas in the purification system, and this first corresponding relationship.

[0142] Reference Figure 2 , in one embodiment, the hydrogen production system further includes an exhaust port 500 and a hydrogen outlet 600. The nitrogen purging device 100 includes a first valve 101, a second valve 102, a third valve 103, a fourth valve 104, a fifth valve 105, a sixth valve 106, a seventh valve 107, an eighth valve 108, a first flowmeter 110, a second flowmeter 120, and a nitrogen supply unit 130. The nitrogen supply unit 130 is sequentially connected to the inlet of the separation system 300 through the first valve 101, the second valve 102, and the first flowmeter 110. The nitrogen supply unit 130 is also sequentially connected to the third valve 103, the fourth valve 104, the second flowmeter 120, and the inlet of the purification system 400. The outlet of the separation system 300 is connected to the inlet of the purification system 400 through the fifth valve 105. The outlet of the separation system 300 is also connected to the exhaust port 500 through the sixth valve 106. The outlet of the purification system 400 is respectively connected to the hydrogen outlet 600 through the seventh valve 107 and to the exhaust port 500 through the eighth valve 108;

[0143] Purging is performed during the hydrogen production stage based on the purging control parameters, including:

[0144] When the hydrogen production stage is the startup stage, the first valve 101, the third valve 103, the sixth valve 106, and the eighth valve 108 are opened, the fifth valve 105 and the seventh valve 107 are closed, and the opening degrees of the second valve 102 and the fourth valve 104 are controlled based on the purging control parameters;

[0145] It should be noted that when the hydrogen production stage is the startup stage, the purging mode is the startup purging mode. In this embodiment, in the startup purging mode, the separation system 300 and the purification system 400 are purged separately and nitrogen purging is carried out simultaneously. For the separation system 300, the first valve 101 and the sixth valve 106 are opened to connect the separation system 300 with the nitrogen supply unit 130, the fifth valve 105 is closed, and the opening degree of the second valve 102 is controlled based on the purging control parameters and through the flow monitoring of the first flowmeter 110 to complete the startup nitrogen purging of the separation system 300. After purging for the purging time or meeting the purging flow rate, the first valve 101 and the sixth valve 106 are closed, and the fifth valve 105 is opened. For the purification system 400, the third valve 103 and the eighth valve 108 are opened to connect the purification system 400 with the nitrogen supply unit 130, the seventh valve 107 is closed, and the opening degree of the fourth valve 104 is controlled based on the purging control parameters and through the flow monitoring of the second flowmeter 120 to complete the startup nitrogen purging of the purification system 400. After purging for the purging time or meeting the purging flow rate, the third valve 103 and the eighth valve 108 are closed, and the seventh valve 107 is opened.

[0146] When the hydrogen production stage is the pre-hydrogen production stage, the fifth valve 105 and the eighth valve 108 are opened, the sixth valve 106 and the seventh valve 107 are closed, and the target purging load current value of the electrolyzer 200 is determined based on the purging control parameters, so that the hydrogen electrolyzed by the electrolyzer 200 based on the target purging load current value enters the separation system 300;

[0147] It should be noted that when the hydrogen production stage is the pre-hydrogen production stage, the purging mode is the pre-hydrogen production purging mode. In this embodiment, in the pre-hydrogen production stage mode, the separation system 300 and the purification system 400 are connected together for hydrogen purging. The fifth valve 105 is opened to connect the separation system 300 and the purification system 400, and the gas is discharged by opening the eighth valve 108. In this embodiment, hydrogen purging is carried out by the hydrogen generated in the electrolyzer 200, and the target purging load current value of the electrolyzer 200 is determined by implementing the calculated purging control parameters, so that the hydrogen electrolyzed by the electrolyzer 200 based on the target purging load current value enters the separation system 300 and the purification system 400. After completing the hydrogen purging, the fifth valve 105 and the eighth valve 108 are closed, and the seventh valve 107 is opened.

[0148] Among them, when determining the target purging load current value of the electrolyzer 200 by implementing the purging control parameters, the corresponding relationship between the purging hydrogen molar flow rate and the purging load current value is referred to, and this corresponding relationship can be expressed as:

[0149]

[0150] Among them, Hin represents the molar flow rate of purging hydrogen, unit: mol / min; Y represents the number of cells in the electrolyzer 200, which is a fixed value, unit: piece; I represents the value of the purging draw current.

[0151] In the case where the purging mode is the pre-hydrogen-production purging mode, the molar flow rate of purging hydrogen can be calculated based on the first corresponding relationship, and then the target purging draw current value can be obtained.

[0152] After the hydrogen purging is completed, close the fifth valve 105 and the eighth valve 108, and open the seventh valve 107.

[0153] In the case where the hydrogen-production stage is the shutdown stage, open the first valve 101, the third valve 103, the sixth valve 106, and the eighth valve 108, close the fifth valve 105 and the seventh valve 107, and control the opening degrees of the second valve 102 and the fourth valve 104 based on the purging control parameters.

[0154] It should be noted that in the case where the hydrogen-production stage is the shutdown stage, the purging mode is the shutdown purging mode. In this embodiment, in the shutdown purging mode, the separation system 300 and the purification system 400 are purged separately and nitrogen purging is carried out simultaneously. For the separation system 300, open the first valve 101 and the sixth valve 106 to connect the separation system 300 with the nitrogen supply unit 130, close the fifth valve 105, and control the opening degree of the second valve 102 based on the purging control parameters and through the flow monitoring of the first flowmeter 110 to complete the start-up nitrogen purging of the separation system 300. After purging for the purging time or meeting the purging flow rate, close the first valve 101 and the sixth valve 106, and open the fifth valve 105. For the purification system 400, open the third valve 103 and the eighth valve 108 to connect the purification system 400 with the nitrogen supply unit 130, close the seventh valve 107, and control the opening degree of the fourth valve 104 based on the purging control parameters and through the flow monitoring of the second flowmeter 120 to complete the start-up nitrogen purging of the purification system 400. After purging for the purging time or meeting the purging flow rate, close the third valve 103 and the eighth valve 108, and open the seventh valve 107.

[0155] In one embodiment, in the case where the hydrogen-production stage is the shutdown stage, open the first valve 101, the third valve 103, the sixth valve 106, and the eighth valve 108, close the fifth valve 105 and the seventh valve 107, and control the opening degrees of the second valve 102 and the fourth valve 104 based on the purging control parameters, including:

[0156] In the case where the hydrogen production stage is the shutdown stage, open the sixth valve 106 and the eighth valve 108, and close the sixth valve 106 until the pressure in the separation system 300 reaches the first preset pressure, and close the eighth valve 108 until the pressure in the purification system 400 reaches the second preset pressure;

[0157] Open the first valve 101, the third valve 103, the sixth valve 106, and the eighth valve 108, close the fifth valve 105 and the seventh valve 107, and control the opening degrees of the second valve 102 and the fourth valve 104 based on the purge control parameters.

[0158] It can be understood that before entering the shutdown purge mode, the hydrogen production system will also be depressurized to improve the operating safety of the hydrogen production system. Specifically, open the sixth valve 106 and the eighth valve 108, close the sixth valve 106 until the pressure in the separation system 300 reaches the first preset pressure, and close the eighth valve 108 until the pressure in the purification system 400 reaches the second preset pressure, so as to realize the depressurization of the separation system 300 and the purification system 400. After the depressurization is completed, open the first valve 101, the third valve 103, the sixth valve 106, and the eighth valve 108, close the fifth valve 105 and the seventh valve 107, and control the opening degrees of the second valve 102 and the fourth valve 104 based on the purge control parameters.

[0159] The embodiment of the present application further provides a hydrogen production system purge device, including:

[0160] A memory configured to store instructions;

[0161] A processor configured to call instructions from the memory and be able to implement the hydrogen production system purge method as described in the above embodiment when executing the instructions.

[0162] Reference Figure 2 , the embodiment of the present application further provides a hydrogen production system, including:

[0163] The hydrogen production system purge device as described in the above embodiment;

[0164] An electrolytic cell 200, a separation system 300, and a purification system 400 connected in sequence;

[0165] A nitrogen purge device 100 connected to the separation system 300 and the purification system 400 respectively.

[0166] Reference Figure 2 , in one embodiment, the hydrogen production system further includes an exhaust port 500 and a hydrogen outlet 600;

[0167] The nitrogen purging device 100 includes a first valve 101, a second valve 102, a third valve 103, a fourth valve 104, a fifth valve 105, a sixth valve 106, a seventh valve 107, an eighth valve 108, a first flowmeter 110, a second flowmeter 120, and a nitrogen supply unit 130. The nitrogen supply unit 130 is sequentially connected to the first valve 101, the second valve 102, the first flowmeter 110, and the inlet of the separation system 300. The nitrogen supply unit 130 is also sequentially connected to the third valve 103, the fourth valve 104, the second flowmeter 120, and the inlet of the purification system 400. The outlet of the separation system 300 is respectively connected to the inlet of the purification system 400 through the fifth valve 105 and to the exhaust port 500 through the sixth valve 106. The outlet of the purification system 400 is respectively connected to the hydrogen outlet 600 through the seventh valve 107 and to the exhaust port 500 through the eighth valve 108.

[0168] An embodiment of the present application also provides a machine-readable storage medium, on which instructions are stored, and the instructions are used to cause a machine to execute the above hydrogen production system purging method.

[0169] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0170] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one or more flows or multiple flows and / or blocks Figure 1 one or more blocks or multiple blocks.

[0171] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the functions in the process Figure 1one or more processes and / or blocks Figure 1 the functions specified in one or more blocks.

[0172] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one or more processes and / or blocks Figure 1 one or more blocks.

[0173] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and memory.

[0174] The memory may include non-permanent memory in the computer-readable medium, in the form of random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

[0175] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can store information by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media, such as modulated data signals and carrier waves.

[0176] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, commodity or device comprising the element.

[0177] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A hydrogen production system purging method, characterized in that: Applied to a hydrogen production system, the hydrogen production system comprises a nitrogen purge device and an electrolyzer, a separation system and a purification system connected in sequence, the nitrogen purge device is connected to the separation system and the purification system respectively, and the hydrogen production system purge method comprises: Determining a purge mode based on the hydrogen production stage of the hydrogen production system, wherein the purge mode includes a startup purge mode, a pre-hydrogen production purge mode, and a shutdown purge mode; Determining a target volume based on the hydrogen production stage, the target volume being the volume within the separation system and / or the purification system; Based on the gas state parameter, the gas material balance principle and the purge mode, a first corresponding relationship is determined, wherein the first corresponding relationship is a corresponding relationship between the purge flow rate, the purge time and the target volume; Determining a purge control parameter in the purge mode based on the target volume, the first corresponding relationship, and a preset parameter, wherein the preset parameter includes a preset time parameter or a preset flow parameter; Purging is performed during the hydrogen production stage based on the purge control parameter.

2. The hydrogen production system purging method according to claim 1, characterized in that: The determining of the first corresponding relationship based on the gas state parameter, the gas material balance principle and the purge mode includes: When the purge mode is the startup purge mode, a second corresponding relationship is determined based on the oxygen material balance principle, the initial volume fraction of oxygen, and the oxygen concentration threshold, wherein the second corresponding relationship is a corresponding relationship between the purge nitrogen molar flow rate, the system storage gas molar amount, and the purge time; Determining a third corresponding relationship based on the gas state parameter, wherein the gas state parameter includes gas temperature and gas absolute pressure, and the third corresponding relationship is a corresponding relationship between the target volume and a molar amount of gas stored in the system, and the molar amount of gas stored in the system includes a molar amount of gas stored in the separation system or a molar amount of gas stored in the purification system; Determining a fourth corresponding relationship based on the gas state parameter, wherein the fourth corresponding relationship is a corresponding relationship between the purge nitrogen molar flow rate and the nitrogen purge flow rate; A first corresponding relationship is determined based on the second corresponding relationship, the third corresponding relationship, and the fourth corresponding relationship, wherein the purge flow in the first corresponding relationship is the nitrogen purge flow.

3. The hydrogen production system purging method according to claim 1, characterized in that: The determining of the first corresponding relationship based on the gas state parameter, the gas material balance principle and the purge mode includes: In the case where the purge mode is a pre-hydrogen production purge mode, a fifth corresponding relationship is determined based on the nitrogen material balance principle, the initial volume fraction of nitrogen, and the nitrogen concentration threshold, wherein the fifth corresponding relationship is a corresponding relationship between the purge hydrogen molar flow rate, the system storage gas molar amount, and the purge time, and the system storage gas molar amount is the total storage gas molar amount of the separation system and the purification system; Determining a sixth corresponding relationship based on the gas state parameters, wherein the gas state parameters include gas temperature and gas absolute pressure, and the sixth corresponding relationship is a corresponding relationship between the target volume and a molar amount of gas stored in the system; A first corresponding relationship is determined based on the fifth corresponding relationship and the sixth corresponding relationship, wherein the purge flow in the first corresponding relationship is the purge hydrogen molar flow.

4. The hydrogen production system purging method according to claim 1, characterized in that: The determining of the first corresponding relationship based on the gas state parameter, the gas material balance principle and the purge mode includes: When the purge mode is the shutdown purge mode, a seventh corresponding relationship is determined based on the hydrogen material balance principle, the initial volume fraction of hydrogen, and the hydrogen concentration threshold, wherein the seventh corresponding relationship is a corresponding relationship between the purge nitrogen molar flow rate, the system storage gas molar amount, and the purge time, and the system storage gas molar amount includes the storage gas molar amount of the separation system or the storage gas molar amount of the purification system; Determining an eighth corresponding relationship based on the gas state parameter, wherein the gas state parameter includes gas temperature and gas absolute pressure, and the eighth corresponding relationship is a corresponding relationship between the target volume and a molar amount of gas stored in the system; Determining a ninth corresponding relationship based on the gas state parameter, wherein the ninth corresponding relationship is a corresponding relationship between a purge nitrogen molar flow rate and a nitrogen purge flow rate; A first corresponding relationship is determined based on the seventh corresponding relationship, the eighth corresponding relationship, and the ninth corresponding relationship, wherein the purge flow in the first corresponding relationship is the nitrogen purge flow.

5. The hydrogen production system purging method according to claim 1, characterized in that: The determining of the target volume based on the hydrogen production stage comprises: In a case where the hydrogen production stage is a startup stage, determining the target volume to be a volume within the separation system or a volume within the purification system; In the case where the hydrogen production stage is a pre-hydrogen production stage, determining the target volume to be the total volume of the separation system and the purification system; When the hydrogen production stage is a shutdown stage, the target volume is determined to be a volume in the separation system or a volume in the purification system.

6. The hydrogen production system purging method according to claim 1, characterized in that: The hydrogen production system also includes an exhaust port and a hydrogen outlet, the nitrogen purge device includes a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a first flow meter, a second flow meter and a nitrogen supply unit, the nitrogen supply unit is connected to the inlet of the separation system through the first valve, the second valve and the first flow meter in sequence, the nitrogen supply unit is also connected to the third valve, the fourth valve, the second flow meter and the inlet of the purification system in sequence, the outlet of the separation system is connected to the inlet of the purification system through the fifth valve, the outlet of the separation system is also connected to the exhaust port through the sixth valve, and the outlet of the purification system is respectively connected to the hydrogen outlet through the seventh valve and to the exhaust port through the eighth valve; The performing of purging in the hydrogen production stage based on the purging control parameter includes: When the hydrogen production stage is a startup stage, the first valve, the third valve, the sixth valve and the eighth valve are opened, the fifth valve and the seventh valve are closed, and the openings of the second valve and the fourth valve are controlled based on the purge control parameter; In the case where the hydrogen production stage is a pre-hydrogen production stage, the fifth valve and the eighth valve are opened, the sixth valve and the seventh valve are closed, and a target purge load current value of the electrolyzer is determined based on the purge control parameter, so that hydrogen obtained by electrolysis of the electrolyzer based on the target purge load current value enters the separation system; When the hydrogen production stage is a shutdown stage, the first valve, the third valve, the sixth valve and the eighth valve are opened, the fifth valve and the seventh valve are closed, and the opening of the second valve and the fourth valve is controlled based on the purge control parameter.

7. The hydrogen production system purging method according to claim 6, characterized in that: When the hydrogen production stage is a shutdown stage, the first valve, the third valve, the sixth valve, and the eighth valve are opened, the fifth valve and the seventh valve are closed, and the opening of the second valve and the fourth valve is controlled based on the purge control parameter, including: When the hydrogen production stage is a shutdown stage, the sixth valve and the eighth valve are opened until the pressure in the separation system reaches a first preset pressure and then the sixth valve is closed, and the pressure in the purification system reaches a second preset pressure and then the eighth valve is closed; The first valve, the third valve, the sixth valve and the eighth valve are opened, the fifth valve and the seventh valve are closed, and the openings of the second valve and the fourth valve are controlled based on the purge control parameter.

8. A hydrogen production system purge device, characterized in that: include: a memory configured to store instructions; A processor is configured to call the instructions from the memory and implement the hydrogen production system purging method according to any one of claims 1 to 7 when executing the instructions.

9. A hydrogen production system, characterized in that: include: The hydrogen production system purge device according to claim 8; An electrolytic cell, a separation system and a purification system connected in sequence; A nitrogen purge device is connected to the separation system and the purification system respectively.

10. The hydrogen production system according to claim 9, characterized in that: The hydrogen production system also includes an exhaust port and a hydrogen outlet; The nitrogen purging device includes a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a first flowmeter, a second flowmeter and a nitrogen supply unit. The nitrogen supply unit is connected to the first valve, the second valve, the first flowmeter and the inlet of the separation system in sequence. The nitrogen supply unit is also connected to the third valve, the fourth valve, the second flowmeter and the inlet of the purification system in sequence. The outlet of the separation system is connected to the inlet of the purification system through the fifth valve and to the exhaust port through the sixth valve, respectively. The outlet of the purification system is connected to the hydrogen outlet through the seventh valve and to the exhaust port through the eighth valve, respectively.

11. A machine-readable storage medium, characterized in that: The machine-readable storage medium stores instructions, which are used to enable a machine to execute the hydrogen production system purging method according to any one of claims 1 to 7.

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