Hydrogen production system

Abstract

The application discloses a hydrogen production system, and belongs to the technical field of hydrogen production. The hydrogen production system comprises an electrolytic cell, a gas-liquid separation unit, a purification unit and an electric heater, the electric heater is used for heating at least one of the electrolytic cell, the gas-liquid separation unit and the purification unit, the electric heater comprises a plurality of electric heating pipe groups, at least one of the plurality of electric heating pipe groups is electrically connected with a power supply through a corresponding power regulator and a corresponding circuit breaker, and other electric heating pipe groups of the plurality of electric heating pipe groups are electrically connected with the power supply through corresponding contactors and corresponding circuit breakers. In the technical scheme of the application, the power control precision of the electric heater can be improved through the grouping control of the electric heater by the power regulator and the contactor with a small range.

Description

Technical Field

[0001] This application belongs to the field of hydrogen production technology, and in particular relates to a hydrogen production system. Background Technology

[0002] Driven by the strong global goal of carbon neutrality, and in order to meet the urgent demand of downstream industries and the energy sector for low-cost, large-scale green hydrogen production, the strengthening of system integration and control technologies has led to modularization and large-scale development as the core trends in the current water electrolysis hydrogen production industry. Among related technologies, current electric heater control devices and methods have several drawbacks. For example, excessive heater power leads to the selection of an oversized power regulator, while the heating power required for low-load operation of the hydrogen production unit is relatively small, resulting in insufficient control accuracy of the power regulator and inability to meet temperature control stability requirements. Furthermore, power regulators based on silicon controlled rectifiers (SCRs) can have a certain impact on grid quality during operation; the higher the power, the greater the impact. Moreover, a single heating element failure can render the entire electric heater unusable, indicating room for improvement. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the related art. To this end, this application proposes a hydrogen production system that can improve the power control accuracy of the electric heater.

[0004] In a first aspect, this application provides a hydrogen production system, comprising: an electrolyzer, a gas-liquid separation unit, a purification unit, and an electric heater, wherein the electric heater is used to heat at least one of the electrolyzer, the gas-liquid separation unit, and the purification unit; The electric heater includes multiple electric heating tube groups. At least one of the multiple electric heating tube groups is electrically connected to the power supply through a corresponding power regulator and a corresponding circuit breaker. The other electric heating tube groups are electrically connected to the power supply through a corresponding contactor and a corresponding circuit breaker.

[0005] In the above technical solution, the power control accuracy of the electric heater can be improved by using a power regulator and contactor with a smaller range for group control.

[0006] According to one embodiment of this application, the rated power of each of the electric heating tube assemblies is equal.

[0007] According to one embodiment of this application, each of the electric heating tube groups includes multiple electric heating tube groups with equal power and the same number.

[0008] According to one embodiment of this application, at least one of the other electric heating tube groups is electrically connected to the corresponding circuit breaker via a contactor and a power regulator connected in parallel, and the circuit breaker is electrically connected to the power supply.

[0009] According to one embodiment of this application, the hydrogen production system further includes: A temperature transmitter is used to detect the operating temperature of the hydrogen production system; The controller is electrically connected to both the contactor and the power regulator.

[0010] According to one embodiment of this application, the hydrogen production system has a first operating mode, the number of electric heating tube groups is n, in the first operating mode, the power output of the controller is X%, X is less than 100 / n, the contactor is not engaged, and the power regulator outputs nX.

[0011] According to one embodiment of this application, the hydrogen production system has a second operating mode, the number of electric heating tube groups is n, in the second operating mode, the power output of the controller is X%, X is not less than (n-1)100 / n and not greater than 100, the contactors are engaged n-1, and the power regulator outputs n[X-(n-1)100 / n]%.

[0012] According to one embodiment of this application, the hydrogen production system further includes: A temperature transmitter is used to detect the operating temperature of the hydrogen production system; The controller is electrically connected to both the contactor and the power regulator.

[0013] According to one embodiment of this application, the number of electric heating tube groups is n, and the hydrogen production system has a third working mode and a fourth working mode; In the third operating mode, the power output of the controller is X%, X is less than 100 / n, the contactor does not engage, one of the power regulators outputs nX%, and the other power regulators do not output. In the fourth operating mode, the power output of the controller is X%, X is not less than (n-1)100 / n and not greater than 100, n-1 contactors are engaged, one of the power regulators outputs n[X-(n-1)100 / n]%, and the other power regulators do not output.

[0014] According to one embodiment of this application, the number of electric heating tube groups is n, the (n-1)th group of electric heating tubes is electrically connected to the corresponding circuit breaker through the contactor and the power regulator connected in parallel, and the nth group of electric heating tubes is electrically connected to the power supply through the corresponding power regulator and the corresponding circuit breaker. In the event of a fault in either the (n-1)th group of electric heating tubes or the nth group of electric heating tubes, the hydrogen production system has a fifth operating mode and a sixth operating mode. In the fifth operating mode, the power output of the controller is X%, where X is less than 100 / n, the contactor does not engage, and the power regulator corresponding to the non-faulty group of electric heating tubes outputs nX%. In the sixth working mode, the power output of the controller is X%, X is not less than (n-2)100 / n and not greater than 100, n-2 contactors are engaged, the contactors connected in parallel with the power regulator are not engaged, and the power regulator corresponding to the non-faulty electric heating tube group outputs n[X-(n-2)100 / n]%.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is one of the schematic diagrams of the electric heater provided in the embodiments of this application; Figure 2 This is a second schematic diagram of the electric heater provided in the embodiments of this application; Figure 3 This is one of the flowcharts of the electric heater provided in the embodiments of this application; Figure 4 This is the second flowchart of the electric heater provided in the embodiments of this application; Figure 5 This is the third flowchart of the electric heater provided in the embodiments of this application; Figure 6 This is a schematic diagram of the hydrogen production system provided in the embodiments of this application.

[0017] Figure label: 10 electric heating element groups; Power regulator 20, first type power regulator 210, second type power regulator 220; Contactor 30, circuit breaker 40, power supply 50; Electrolytic cell 60, gas-liquid separation unit 70, purification unit 80. Detailed Implementation

[0018] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0019] This application aims to address at least one of the technical problems existing in the related art. To this end, this application proposes a hydrogen production system that can improve the power control accuracy of the electric heater.

[0020] The following is for reference. Figures 1-6 A hydrogen production system according to an embodiment of this application is described.

[0021] like Figure 1 and Figure 6 As shown, the hydrogen production system includes: an electrolyzer 60, a gas-liquid separation unit 70, a purification unit 80, and an electric heater, wherein the electric heater is used to heat at least one of the electrolyzer 60, the gas-liquid separation unit 70, and the purification unit 80. The electric heater includes multiple electric heating tube groups 10. At least one of the multiple electric heating tube groups 10 is electrically connected to the power supply 50 through a corresponding power regulator 20 and a corresponding circuit breaker 40. The other electric heating tube groups 10 are electrically connected to the power supply 50 through a corresponding contactor 30 and a corresponding circuit breaker 40.

[0022] In this embodiment, an electric heater can be used to heat at least one of the electrolytic cell 60, the gas-liquid separation unit 70, and the purification unit 80 to improve electrolysis efficiency.

[0023] When the electrolytic cell 60 starts at room temperature, the electrochemical reaction efficiency is very low. By preheating the electrolyte with an electric heater, the preheated electrolyte enters the electrolytic cell 60, which can quickly bring the electrolytic cell 60 to the optimal operating temperature, thereby reducing the cold start time. Furthermore, when the equipment is operating under low load or the ambient temperature is too low, the heat generated by the electrolytic cell 60 may not be sufficient to maintain its optimal operating temperature. In this case, the electric heater can act as a supplementary heat source and work intermittently to maintain the stability of the system temperature.

[0024] During water electrolysis, the generated hydrogen contains water vapor and oxygen. Catalytic deoxygenation technology is usually used. Under the action of a catalyst, hydrogen and oxygen undergo a combination reaction at a certain temperature to produce water. The catalytic reaction is usually carried out at a certain temperature. The corresponding device in the purification unit 80 is preheated by an electric heater before the hydrogen catalytic reaction begins, which helps the catalytic reaction to proceed smoothly.

[0025] Adsorption dryers are commonly used to remove water vapor, but the adsorbent in the dryer will become saturated after working for a period of time and needs to be regenerated to restore its adsorption capacity. The regeneration process includes two stages: heating and cooling. High-temperature regeneration hydrogen can be generated by an electric heater. The high-temperature regeneration hydrogen purges the adsorption bed to desorb the adsorbed water, thereby regenerating the adsorbent.

[0026] Furthermore, the electric heater includes multiple electric heating tube groups 10, each electric heating tube group 10 including multiple electric heating tubes. The number of electric heating tube groups 10 is defined as n, and the total number of electric heating tubes is defined as m. Then each electric heating tube group 10 includes m / n electric heating tubes.

[0027] At least one of the multiple electric heating tube groups 10 can be electrically connected to the power supply 50 through a corresponding power regulator 20 and a corresponding circuit breaker 40, and the other electric heating tube groups 10 can be electrically connected to the power supply 50 through a corresponding contactor 30 and a corresponding circuit breaker 40.

[0028] The multiple electric heating tube groups 10 can be electrically connected to a single power supply 50, or the multiple electric heating tube groups 10 can be electrically connected to multiple power supplies 50 in a one-to-one correspondence.

[0029] The control device for the electric heater includes at least a circuit breaker 40, a power regulator 20, a controller, and a temperature transmitter. The circuit breaker 40 is mainly used for short-circuit protection. The core component of the power regulator 20 is a thyristor, which is mainly used to regulate the power of the electric heater. It can use PID control. The controller performs PID calculations based on the set temperature and the temperature collected by the temperature transmitter to control the power output from the power regulator 20 to the electric heater.

[0030] Driven by the strong global goal of carbon neutrality, and in order to meet the urgent demand of downstream industries and the energy sector for low-cost, large-scale green hydrogen production, the strengthening of system integration and control technologies has led to modularization and large-scale development as the core trends in the current water electrolysis hydrogen production industry. Among related technologies, current electric heater control devices and methods have several drawbacks. For example, excessive heater power leads to an oversized power regulator 20, while the required heating power for low-load operation of the hydrogen production unit is too small, resulting in insufficient control accuracy of the power regulator 20 and inability to meet temperature control stability requirements. Furthermore, the power regulator 20, with its thyristor as a core component, can have a certain impact on grid quality during operation; the higher the power, the greater the impact. Moreover, a single heating element failure can render the entire electric heater unusable, indicating room for improvement.

[0031] This application divides multiple electric heating tubes of an electric heater into multiple groups. At least one of the multiple electric heating tube groups 10 is controlled by a power regulator 20 for output power control, while the other electric heating tube groups 10 are controlled by a contactor 30 for output power control. This application uses a power regulator 20 with a smaller range for fine adjustment. The power regulator 20 can adjust the output power ratio of a single electric heating tube group 10. The contactor 30 can switch the corresponding electric heating tube group 10 on or off by switching it on and off. The power regulator 20 and the contactor 30 work together to improve the power control accuracy of the electric heater, which helps maintain temperature control stability when the hydrogen production unit is operating at low load and also reduces the risk of equipment shutdown due to the failure of a single heating tube. In addition, the power regulator 20 of this application does not control all electric heating tube groups 10, which helps to reduce the impact of the power regulator 20 on power grid quality. According to the hydrogen production system provided in the embodiments of this application, the power control accuracy of the electric heaters can be improved by using a power regulator 20 and a contactor 30 with a smaller range for group control of the electric heaters.

[0032] In some embodiments, the rated power of each electric heating element group 10 is equal.

[0033] In this embodiment, multiple electric heating tubes are divided into multiple electric heating tube groups 10, and the rated power of each electric heating tube group 10 is equal.

[0034] It is understandable that dividing multiple electric heating tubes into multiple groups 10 of electric heating tubes with equal rated power can achieve precise and predictable graded power input, which helps to simplify the control logic.

[0035] For example, the electric heater includes n electric heating tube groups 10, one of which is controlled by a power regulator 20 for fine adjustment, while the other electric heating tube groups 10 are controlled by a contactor 30 for step compensation.

[0036] The rated power of the electric heating tube assembly 10 is defined as P. When the electric heating tube assembly 10 is outputting power controlled by the power regulator 20 and not outputting power controlled by the contactor 30, the system has a minimum power level, ranging from 0 to P.

[0037] When both the electric heating element group 10 controlled by the power regulator 20 and the electric heating element group 10 controlled by the contactor 30 are outputting power, the system has a maximum power level, ranging from (n-1)P to nP. In other words, the system power can be controlled by the number of connected electric heating tube groups 10 and the output of the power regulator 20.

[0038] In addition, the equal rated power of each of the 10 electric heating tube groups can optimize load distribution, improve system life, and help create a uniform heat field when heating the same equipment, reducing the risk of local overheating or uneven heating.

[0039] In some embodiments, each electric heating element group 10 includes a plurality of electric heating element groups 10 with equal power and the same number.

[0040] In this embodiment, each electric heating tube group 10 includes multiple electric heating tube groups 10 with equal power and the same number, which are easy to replace and do not require consideration of power matching issues, thereby reducing maintenance complexity.

[0041] In some embodiments, such as Figure 2 As shown, at least one of the other electric heating tube groups 10 is electrically connected to the corresponding circuit breaker 40 via a contactor 30 and a power regulator 20 connected in parallel. The circuit breaker 40 is electrically connected to the power supply 50.

[0042] In this embodiment, at least one of the plurality of electric heating tube groups 10 can be electrically connected to the power supply 50 through a corresponding power regulator 20 and a corresponding circuit breaker 40. At least one other of the plurality of electric heating tube groups 10 can be electrically connected to the corresponding circuit breaker 40 through a contactor 30 connected in parallel and a power regulator 20. The corresponding circuit breaker 40 is electrically connected to the power supply 50. Other electric heating tube groups 10 can be electrically connected to the power supply 50 through a corresponding contactor 30 and a corresponding circuit breaker 40.

[0043] For example, the nth electric heating tube group 10 in the n electric heating tube groups 10 is electrically connected to the power supply 50 through the corresponding power regulator 20 and the corresponding circuit breaker 40, the (n-1)th electric heating tube group 10 is electrically connected to the corresponding circuit breaker 40 through the parallel contactor 30 and the power regulator 20, and the corresponding circuit breaker 40 is electrically connected to the power supply 50, and the other n-2 electric heating tube groups 10 are electrically connected to the power supply 50 through the corresponding contactor 30 and the corresponding circuit breaker 40.

[0044] It should be noted that the electric heating tube group 10, which is electrically connected to the corresponding circuit breaker 40 through the parallel contactor 30 and power regulator 20, has two states. The electric heating tube group 10 can be controlled by the contactor 30 or by the power regulator 20, but cannot be controlled by the contactor 30 and the power regulator 20 at the same time.

[0045] Furthermore, the power regulator 20 connected in parallel with the contactor 30 is defined as a first type of power regulator 210, and the power regulator 20 not connected in parallel with the contactor 30 is defined as a second type of power regulator 220.

[0046] In some embodiments, as shown in the figure, the hydrogen production system further includes a temperature transmitter and a controller. The temperature transmitter is used to detect the operating temperature of the hydrogen production system, and the controller is electrically connected to both the contactor 30 and the power regulator 20.

[0047] In this embodiment, the temperature transmitter is used to detect the operating temperature of the hydrogen production system in real time and convert the physical temperature signal into an electrical signal to be sent to the controller.

[0048] The controller receives the signal from the temperature transmitter and compares it with the internally set target temperature value. Based on the deviation between the actual temperature and the target temperature, it performs calculations and makes decisions according to a preset intelligent algorithm, and then sends precise control commands to the execution layer.

[0049] The execution layer includes, but is not limited to, a power regulator 20 and a contactor 30. The power regulator 20 can perform fine-tuning of a single electric heating tube group 10 according to the analog signal from the controller. The contactor 30 performs on / off control according to the switching signal from the controller, thereby controlling the activation and deactivation of the electric heating tube group 10 corresponding to the contactor 30.

[0050] In some embodiments, such as Figure 3 As shown, the number of electric heating tube groups 10 is n. When one of the n electric heating tube groups 10 is electrically connected to the power supply 50 through the corresponding power regulator 20 and the corresponding circuit breaker 40, and the other electric heating tube groups 10 in the n electric heating tube groups 10 are electrically connected to the power supply 50 through the corresponding contactor 30 and the corresponding circuit breaker 40, the hydrogen production system has a first working mode and a second working mode.

[0051] In this embodiment, the power output of the controller is X%. When X is less than 100 / n, the system switches to the first working mode, only the electric heating tube group 10 controlled by the power regulator 20 is activated, and all other contactors 30 are not engaged. The power regulator 20 outputs nX.

[0052] In other words, in the first working mode, the electric heating tube group 10 controlled by the power regulator 20 is in the working state, the contactor 30 is in the open state, and the multiple electric heating tube groups 10 controlled by the contactor 30 are not working. At this time, the output power of the system is the output power of the electric heating tube group 10 controlled by the power regulator 20.

[0053] In this embodiment, the power output of the controller is X%. When X is not less than 100 / n and not greater than 100, the system switches to the second working mode, and the electric heating tube group 10 controlled by the power regulator 20 and the electric heating tube group 10 controlled by some of the contactors 30 are activated. The contactors 30 engage n-1, and the power regulator 20 outputs n(X-100 / n)%.

[0054] In other words, in the second operating mode, the electric heating tube group 10 controlled by the power regulator 20 is in the working state, at least one of the multiple contactors 30 is in the closed state, and at least one of the multiple electric heating tube groups 10 controlled by the contactor 30 is in the working state. At this time, the output power of the system is the sum of the output power of the electric heating tube group 10 controlled by the power regulator 20 and the output power of the electric heating tube group 10 controlled by the contactor 30 in the closed state.

[0055] In some embodiments, such as Figure 4 and Figure 5 As shown, the number of electric heating tube groups 10 is n. At least one of the n electric heating tube groups 10 is electrically connected to the power supply 50 through a corresponding power regulator 20 and a corresponding circuit breaker 40. At least one of the n electric heating tube groups 10 is electrically connected to the corresponding circuit breaker 40 through a parallel contactor 30 and a power regulator 20. The corresponding circuit breaker 40 is electrically connected to the power supply 50. When the other electric heating tube groups 10 in the n electric heating tube groups 10 are electrically connected to the power supply 50 through a corresponding contactor 30 and a corresponding circuit breaker 40, the hydrogen production system has a third working mode, a fourth working mode, a fifth working mode, and a sixth working mode.

[0056] In this embodiment, when multiple electric heating tube groups 10 are not faulty, the hydrogen production system has a third operating mode and a fourth operating mode. When one of the electric heating tube groups 10 electrically connected to the corresponding circuit breaker 40 via the second type of power regulator 220 and the electric heating tube group 10 electrically connected to the corresponding circuit breaker 40 via the parallel contactor 30 and the first type of power regulator 210 fails, the hydrogen production system has a fifth operating mode and a sixth operating mode.

[0057] Among them, such as Figure 4 As shown, when multiple electric heating tube groups 10 are not faulty, taking one of the n electric heating tube groups 10 as an example, which is electrically connected to the corresponding circuit breaker 40 through the corresponding second type power regulator 220, and the other of the n electric heating tube groups 10 as an example, which is electrically connected to the corresponding circuit breaker 40 through the parallel contactor 30 and the first type power regulator 210, the hydrogen production system has a third working mode and a fourth working mode.

[0058] The controller's power output is X%. When X is less than 100 / n, the system switches to the third working mode, and all contactors 30 are not engaged. One power regulator 20 outputs nX%, while the other power regulators 20 do not output. For example, only one electric heating tube group 10 connected to the circuit breaker 40 via the second type of power regulator 220 can be activated, or only one electric heating tube group 10 connected to the circuit breaker 40 via the contactors 30 in parallel and the first type of power regulator 210 can be activated.

[0059] In other words, in the third working mode, one of the electric heating tube groups 10 controlled by the power regulator 20 is in working state, while the other electric heating tube groups 10 controlled by the power regulator 20 are in non-working state, the contactor 30 is in the open state, and all the electric heating tube groups 10 controlled by the contactor 30 are not working. At this time, the output power of the system is the output power of the electric heating tube group 10 controlled by the power regulator 20 in working state.

[0060] In addition, the power output of the controller is X%. When X is not less than (n-1)100 / n and not greater than 100, n-1 contactors 30 are engaged, one of which power regulators 20 outputs n[X-(n-1)100 / n]%, and the other power regulators 20 do not output.

[0061] In other words, in the fourth operating mode, the electric heating tube group 10 controlled by the power regulator 20 is in the working state, at least one of the multiple contactors 30 is in the closed state, and at least one of the multiple electric heating tube groups 10 controlled by the contactor 30 is in the working state. At this time, the output power of the system is the sum of the output power of the electric heating tube group 10 controlled by the power regulator 20 and the output power of the electric heating tube group 10 controlled by the contactor 30 in the closed state.

[0062] In this embodiment, the (n-1)th group of electric heating tubes is electrically connected to the corresponding circuit breaker 40 via a parallel contactor 30 and a first-type power regulator 210, and the nth group of electric heating tubes is electrically connected to the power supply 50 via a corresponding second-type power regulator 220 and a corresponding circuit breaker 40. In the event of a fault in either the (n-1)th group of electric heating tubes or the nth group of electric heating tubes, the hydrogen production system has a fifth operating mode and a sixth operating mode.

[0063] like Figure 5 As shown, taking the failure of the nth group of electric heating tubes as an example, the power output of the controller is X%. When X is less than 100 / n, the system switches to the fifth working mode, all contactors 30 do not engage, and the first type of power regulator 210 corresponding to the non-faulty electric heating tube group 10 outputs nX.

[0064] In other words, in the fifth operating mode, the electric heating tube group 10 controlled by the first type of power regulator 210 that is not faulty is in the working state, the contactor 30 is in the open state, and the multiple electric heating tube groups 10 controlled by the contactor 30 are not working. At this time, the output power of the system is the output power of the electric heating tube group 10 controlled by the first type of power regulator 210 in the working state.

[0065] Taking the failure of the nth group of electric heating tubes as an example, the power output of the controller is X%. When X is not less than (n-2)100 / n and not greater than 100, the system switches to the sixth working mode. Contactors 30 engage n-2, and contactors 30 connected in parallel with the first type of power regulator 210 do not engage. The first type of power regulator 210 corresponding to the non-faulty electric heating tube group 10 outputs n[X-(n-2)100 / n]%.

[0066] In other words, in the sixth operating mode, the electric heating tube group 10 controlled by the first type of power regulator 210 that is not faulty is in the working state, at least one of the multiple contactors 30 is in the closed state, and at least one of the multiple electric heating tube groups 10 controlled by the contactor 30 is in the working state. At this time, the output power of the system is the sum of the output power of the electric heating tube group 10 controlled by the first type of power regulator 210 and the output power of the electric heating tube group 10 controlled by the contactor 30 that is in the closed state.

[0067] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0068] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0069] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0070] In the description of this application, "multiple" means two or more.

[0071] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0072] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A hydrogen production system, characterized in that, include: An electrolytic cell (60), a gas-liquid separation unit (70), a purification unit (80), and an electric heater, the electric heater being used to heat at least one of the electrolytic cell (60), the gas-liquid separation unit (70), and the purification unit (80); The electric heater includes multiple electric heating tube groups (10), at least one of the multiple electric heating tube groups (10) is electrically connected to the power supply (50) through a corresponding power regulator (20) and a corresponding circuit breaker (40), and the other electric heating tube groups (10) are electrically connected to the power supply (50) through a corresponding contactor (30) and a corresponding circuit breaker (40).

2. The hydrogen production system according to claim 1, characterized in that, The rated power of each of the electric heating tube groups (10) is equal.

3. The hydrogen production system according to claim 2, characterized in that, Each of the electric heating tube groups (10) includes multiple electric heating tube groups (10) with equal power and the same number.

4. The hydrogen production system according to any one of claims 1-3, characterized in that, At least one of the other electric heating tube assemblies (10) is electrically connected to the corresponding circuit breaker (40) via a contactor (30) and a power regulator (20) connected in parallel, and the circuit breaker (40) is electrically connected to the power supply (50).

5. The hydrogen production system according to any one of claims 1-3, characterized in that, The hydrogen production system also includes: A temperature transmitter is used to detect the operating temperature of the hydrogen production system; The controller is electrically connected to both the contactor (30) and the power regulator (20).

6. The hydrogen production system according to claim 5, characterized in that, The hydrogen production system has a first working mode, the number of electric heating tube groups (10) is n, in the first working mode, the power output of the controller is X%, X is less than 100 / n, the contactor (30) is not engaged, and the power regulator (20) outputs nX.

7. The hydrogen production system according to claim 5, characterized in that, The hydrogen production system has a second working mode. The number of electric heating tube groups (10) is n. In the second working mode, the power output of the controller is X%, X is not less than (n-1)100 / n and not greater than 100. The contactors (30) are engaged n-1. The power regulator (20) outputs n[X-(n-1)100 / n]%.

8. The hydrogen production system according to claim 4, characterized in that, The hydrogen production system also includes: A temperature transmitter is used to detect the operating temperature of the hydrogen production system; The controller is electrically connected to both the contactor (30) and the power regulator (20).

9. The hydrogen production system according to claim 8, characterized in that, The number of electric heating tube groups (10) is n, and the hydrogen production system has a third working mode and a fourth working mode; In the third working mode, the power output of the controller is X%, X is less than 100 / n, the contactor (30) does not engage, one of the power regulators (20) outputs nX%, and the other power regulators (20) do not output; In the fourth working mode, the power output of the controller is X%, X is not less than (n-1)100 / n and not greater than 100, the contactor (30) engages n-1, one of the power regulators (20) outputs n[X-(n-1)100 / n]%, and the other power regulators (20) do not output.

10. The hydrogen production system according to claim 8, characterized in that, The number of electric heating tube groups (10) is n. The (n-1)th group of electric heating tubes is electrically connected to the corresponding circuit breaker (40) through the contactor (30) and the power regulator (20) connected in parallel. The nth group of electric heating tubes is electrically connected to the power supply (50) through the corresponding power regulator (20) and the corresponding circuit breaker (40). In the event of a fault in either the (n-1)th or the nth group of electric heating tubes, the hydrogen production system has a fifth operating mode and a sixth operating mode. In the fifth operating mode, the power output of the controller is X%, where X is less than 100 / n, the contactor (30) does not engage, and the power regulator (20) corresponding to the non-faulty electric heating tube group (10) outputs nX%. In the sixth working mode, the power output of the controller is X%, X is not less than (n-2)100 / n and not greater than 100, n-2 contactors (30) are engaged, the contactors (30) connected in parallel with the power regulator (20) are not engaged, and the power regulator (20) corresponding to the non-faulty electric heating tube group (10) outputs n[X-(n-2)100 / n]%.

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