Green electricity hydrogen production equipment

Abstract

The utility model discloses green electricity hydrogen production equipment, which belongs to the technical field of hydrogen production and green electricity hydrogen production equipment and comprises a hydrogen production device, a sensor and a controller. The sensor is used for monitoring working parameters of the hydrogen production device. The controller is electrically connected with the sensor and the hydrogen production device, and the controller is used for receiving data of the sensor and adjusting the working state of the hydrogen production device according to the data. According to the green electricity hydrogen production equipment disclosed by the embodiment of the invention, the hydrogen production device is automatically controlled through the controller, the workload of operators can be reduced to the maximum extent, the system has clear parameters, the system only needs to operate according to the parameters, the system is stable and reliable, and the stable work of the hydrogen production device can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydrogen green electricity hydrogen production equipment technical field, specifically, relate to a kind of green electricity hydrogen production equipment. BACKGROUND

[0002] Hydrogen energy technology is a major direction of world energy transformation and power transformation, accelerating the development of hydrogen energy related industries is the choice of responding to global climate change, ensuring energy supply security and realizing sustainable development.

[0003] Although the water electrolysis process has high energy consumption, due to the fluctuation of wind power, photovoltaic power and other power sources, water electrolysis is still a better choice, but the power fluctuation range and system control of the water electrolysis hydrogen production system are higher. In the future, flexible control and safe and efficient hydrogen production system will be well adapted to green electricity hydrogen production in large-scale renewable energy hydrogen production scenarios, and in actual projects, there are problems such as large amount of personnel operation and unclear system operation strategy. UTILITY MODEL CONTENT

[0004] The utility model discloses a kind of green electricity hydrogen production equipment to improve the above-mentioned problem.

[0005] The technical scheme adopted by the utility model to solve the above technical problems is:

[0006] Based on the above purpose, the utility model discloses a kind of green electricity hydrogen production equipment, comprising:

[0007] Hydrogen production device;

[0008] Sensor, the sensor is installed to the hydrogen production device, and the sensor is used to monitor the working parameter of the hydrogen production device;

[0009] Controller, the controller is electrically connected with the sensor and the hydrogen production device, and the controller is used to receive the data of the sensor and adjust the working state of the hydrogen production device according to the data;

[0010] Among them, first control system, second control system and third control system are arranged in the controller, the first control system is used to receive the data of sensor and adjust the working state of the hydrogen production device according to the data, the second control system is used to monitor whether the operation of the first control system is normal, when the second control system monitors that the operation of the first control system is not normal, the second control system makes the third control system start working, and the third control system is used to receive the data of the sensor and control the hydrogen production device to stop working when the working parameter implementation value in the hydrogen production device exceeds predetermined value range.

[0011] Optionally, the temperature sensor for detecting the temperature of the alkali solution is further included, and the temperature sensor is connected with the controller, and when the temperature of the alkali solution is higher than or equal to the preset temperature, the hydrogen production device can be directly started.

[0012] Optionally, the controller further includes a timing circuit, the timing circuit starts timing after the hydrogen production device stops working, during the timing of the timing circuit, the temperature of the alkali solution is kept at the preset temperature, and when the timing of the timing circuit ends, the alkali solution is stopped from being heated.

[0013] Optionally, the hydrogen production device is provided in a plurality of forms, the plurality of hydrogen production devices are electrically connected with the controller, and each of the hydrogen production devices is respectively provided with one sensor.

[0014] Compared with the prior art, the hydrogen production device has the beneficial effects that:

[0015] The embodiment of the utility model discloses a kind of green electricity hydrogen production equipment, it includes hydrogen production device, sensor and controller.Sensor is used to monitor the working parameter of hydrogen production device.Controller is electrically connected with sensor and hydrogen production device, and controller is used to receive the data of sensor and adjusts the working state of hydrogen production device according to the data.

[0016] The green electricity hydrogen production equipment disclosed in the embodiment is automatically controlled by controller to hydrogen production device, can maximize the workload of operator, and the system has clear parameter, system only needs to run according to parameter, system is stable and reliable, can guarantee that hydrogen production device works stably. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The schematic diagram of the green electricity hydrogen production equipment disclosed in the embodiment of the utility model is shown;

[0018] Figure 2 The flow chart of the green electricity hydrogen production method disclosed in the embodiment of the utility model is shown.

[0019] In the figure:

[0020] 100-hydrogen production device, 200-sensor, 300-controller, 310-first control system, 320-second control system, 330-third control system. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below by specific embodiment and in conjunction with the drawings.

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application is described clearly and completely above in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0023] Therefore, the above detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected 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 labor are within the scope of protection of the present application.

[0024] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present application, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the present application.

[0026] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] In the present application, unless otherwise explicitly specified and limited, the first feature above or below the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature above, above and above the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature below, below and below the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0028] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0029] Embodiment:

[0030] Referring to Figure 1 The utility model discloses a kind of green electricity hydrogen production equipment, it includes hydrogen production device 100, sensor 200 and controller 300.Sensor 200 is used to monitor the working parameter of hydrogen production device 100.Controller 300 is electrically connected with sensor 200 and hydrogen production device 100, and controller 300 is used to receive the data of sensor 200 and adjusts the working state of hydrogen production device 100 according to the data.

[0031] The green electricity hydrogen production equipment disclosed in the embodiment can maximize the workload of operator by the automatic control of controller 300 to hydrogen production device 100, and the system has clear parameters, and the system can be operated according to the parameters, and the system is stable and reliable, and can ensure that hydrogen production device 100 works stably.

[0032] Among them, first control system 310 is used to receive the data of sensor 200 and adjusts the working state of hydrogen production device 100 according to the data, second control system 320 is used to monitor whether the operation of first control system 310 is normal, when second control system 320 monitors that the operation of first control system 310 is not normal, second control system 320 makes third control system 330 start working, and third control system 330 is used to receive the data of sensor 200 and controls hydrogen production device 100 to stop working when the implementation value of working parameter in hydrogen production device 100 exceeds predetermined value range.

[0033] In an embodiment, preset control time is arranged in first control system 310, when first control system 310 adjusts the working state of hydrogen production device 100, if first control system 310 does not make hydrogen production device 100 return to normal working state in preset control time period, then first control system 310 controls hydrogen production device 100 to stop working, otherwise, first control system 310 controls hydrogen production device 100 to continue working.

[0034] The green electricity hydrogen production device disclosed in the embodiment further comprises a temperature sensor 200 for detecting the temperature of the alkali solution, and the temperature sensor 200 is connected with the controller 300, and the hydrogen production device 100 can be directly started when the temperature of the alkali solution is higher than or equal to the preset temperature. In the embodiment, the system is divided into a hot standby state and a cold start state, and the hot standby and cold start of the device are defined with reference to the temperature of the alkali solution. In the embodiment, the preset temperature of the alkali solution can be set to 50℃, and when the temperature of the alkali solution is equal to or higher than 50℃, the system is in a hot standby state, and at this time, the hydrogen production device 100 can be directly started. When the temperature of the alkali solution is lower than 50℃, the system is in a cold start state, and at this time, the hydrogen production device 100 cannot be directly started. Of course, in other embodiments, the preset temperature of the alkali solution can also be set to 48℃, 49℃, 51℃ or 52℃, etc.

[0035] In one embodiment, the controller 300 further comprises a timing circuit, which starts timing after the hydrogen production device 100 stops working. During the timing of the timing circuit, the temperature of the alkali solution is maintained at the preset temperature. When the timing of the timing circuit ends, the heating of the alkali solution is stopped. After the system receives a normal shutdown or interlocking shutdown signal, the shutdown program is executed, the hydrogen and oxygen regulating valves are gradually depressurized, and the alkali solution circulating pump works for more than half an hour, and the internal alkali solution performs natural cooling work.

[0036] In one embodiment, the hydrogen production device 100 is provided in multiple, and the multiple hydrogen production devices 100 are electrically connected with the controller 300, and each hydrogen production device 100 is respectively provided with a sensor 200.

[0037] The hydrogen production device 100 comprises an electrolytic cell, a hydrogen collection structure, an oxygen collection structure, a gas-liquid processor and a pressurizing structure. The hydrogen collection structure and the oxygen collection structure are in communication with the electrolytic cell, and the hydrogen collection structure and the oxygen collection structure are respectively provided with the gas-liquid processor and the pressurizing structure. The working parameters include working pressure, working temperature, hydrogen liquid level, hydrogen purity, oxygen liquid level and oxygen purity. The sensor 200 comprises a pressure sensor 200, a temperature sensor 200, a liquid level sensor and a purity sensor 200. The controller 300 adjusts each working parameter according to the data monitored by each sensor 200.

[0038] Further comprising an alarm, and each of the electrolytic cell, the hydrogen collection structure, the oxygen collection structure, the gas-liquid processor and the pressurizing structure is provided with an alarm, and each alarm is correspondingly provided with each sensor 200, and the alarm alarms when each data monitored by the sensor 200 exceeds the preset range.

[0039] After the device is started, the current automatic setting control logic is executed respectively, and the pressure and temperature system in the rear stage is controlled through the system overshoot control strategy to ensure the operation accuracy of the device and the safety performance of the system. The consumption of hydrogen production power in real-time interaction with the upstream system is used to ensure system scheduling. When the system has multiple electrolytic cells, the serial numbers are 1-i electrolytic cells in turn.

[0040] In the debugging boot phase, the initial health degree Qci is calculated through data evaluation, and the health degrees are sorted, so that the execution logic is booted in turn from low health degree to high health degree, and the system is booted in turn when the device reaches the minimum load. It should be noted that in addition to the health degree sorting, the state of the device is started in turn at the minimum load of 20%-40% of the device. This setting can realize the rapid start of the system and ensure the qualified product gas.

[0041] After the next step of complete device startup and stabilization, the overall state of the device is re-evaluated every day, and stable power is allocated to the device with the highest health degree value in turn, and the devices with lower scores bear the fluctuating operating conditions. Preferably, the optimal operating condition of the system device is 60%-100%, and the device can be stopped below this condition; further, 1-i devices can be grouped, and lower array work is performed between different groups, and the interval period is rotated every day.

[0042] When the device is in fluctuating operating conditions, the liquid level and temperature regulation mode refers to the pressure regulation mode, and the key parameters such as the voltage, current and circulation amount of the electrolytic cell are associated, and the purity change index is also focused on to realize dynamic regulation of the parameters. Here, the temperature control logic is taken as an example. According to the heat balance formula:

[0043] Alkaline solution circulation heat Qliquid = mliquid cliquid Atcell (associated with electrolytic cell current and voltage)

[0044] Cooling water heat Qcool = mcool ccool Atcool

[0045] Through the time relationship, the cooling water amount is calculated in advance. In the traditional control method, the opening degree of the refrigerant regulating valve is adjusted through PID by comparing the set value of the post-tank temperature with the post-tank temperature. Since the post-tank temperature has exceeded the set value at this time, the opening degree of the refrigerant regulating valve is relatively large. The utility model calculates the refrigerant flow to make the opening degree of the regulating valve at a reasonable position, and realizes advanced regulation.

[0046] The pressure and liquid level regulation steps optimize the cumulative calculation value of the gas production amount under different currents to adjust the CV value of the valve in advance,

[0047] Set the maximum current, maximum gas production, simulated gas production, set the container volume, and calculate the pressure

[0048] PV = nRT, p = (cumulative gas production value * 89.3 * 0.5 * 8.31 * (273 + 20)) / volume V

[0049] (One standard hydrogen gas is equal to 89.3g, 22.4L of hydrogen gas is 1mol, about 2g, R is 8.31, T is 273 + 20)

[0050] p = (cumulative gas production value * 89.3 * 0.5 * 8.31 * (273 + 20)) / volume V H2

[0051] P = gas production * 108715.16 / volume m3pa

[0052] Similarly, the liquid level difference reflects the pressure difference ΔP = pgh

[0053] In summary, when the system fluctuates rapidly, the overshoot control is realized by rapidly adjusting the system parameters (P ID tuning).

[0054] The approximate working mode of the green electricity hydrogen production equipment disclosed in the embodiment is as follows: 1) under the condition of micro-positive pressure of the equipment, the equipment enters the pre-starting position, the system performs self-checking, first, the alkali solution circulating pump is started to work by intermittently opening and closing the automatic exhaust valve between the inlet and outlet of the alkali solution circulating pump for 10s more than three times; qualified hydrogen and nitrogen are rapidly pressurized from the outside, and the on-off of the gas is intermittently controlled through the electromagnetic valve, so that the system pressure is not less than 0.5MPa. 2) after the equipment receives a starting instruction, the current value and the system pressure are given in sequence by artificial setting, and whether the system parameters are normal is observed, and when there is no abnormality, the parameters of the system are gradually improved to the rated working state; 3) confirmation and operation of the peripheral system, before the equipment works, whether the system is purged, whether the alkali solution circulating pump is exhausted, whether the supply of various instrument parameters, water, electricity and gas is normal; 4) judgment and analysis of the actual working state of each equipment after starting, mainly including instrument reading, whether there is pipeline leakage, working partition and vibration size of the circulating pump, whether there is equipment noise and the like; 5) treatment measures after the equipment fails. After the equipment is started, it is gradually brought into the adjustable range, the judgment basis of the key parameters of the system is increased, and the "health degree" statistics of each device or structure are sequentially completed.

[0055] Referring to Figure 2 The utility model embodiment further discloses a green electricity hydrogen production method, which comprises the following steps: step one, setting a predetermined value range of working parameters; step two, starting the hydrogen production device 100; step three, when the working parameter implementation value in the hydrogen production device 100 exceeds the predetermined value range, the controller 300 automatically adjusts the hydrogen production device 100 to make the working parameter implementation value of the hydrogen production device 100 return to the predetermined value range.

[0056] The green electricity hydrogen production method disclosed in the embodiment can maximize the reduction of the workload of the operator through the automatic control of the hydrogen production device 100 by the controller 300, and the system has clear parameters, and the system only needs to run according to the parameters, the system is stable and reliable, and can ensure the stable work of the hydrogen production device 100.

[0057] After the device is started, the current automatic setting control logic is executed, and the pressure and temperature systems in the later stage are controlled through the system overshoot control strategy to ensure the operation accuracy of the device and the safety performance of the system. In the pre-starting position of the device, the system judges whether the machine starting condition is met through the self-checking process, and connects the external hydrogen storage tank and nitrogen pipeline through the hydrogen separator and the oxygen separator, and adjusts the pressure quickly through the electromagnetic valve.

[0058] In step three, the working parameters include working pressure, working temperature, hydrogen liquid level, hydrogen purity, oxygen liquid level, and oxygen purity. Initially, a predetermined value range is set for each working parameter, and in the subsequent working process of the hydrogen production device 100, if one of the working parameters exceeds the predetermined value range, the controller 300 needs to control the related components of the hydrogen production device 100, so that the related working parameters of the hydrogen production device 100 can return to the predetermined value range.

[0059] In another embodiment, the green electricity hydrogen production method comprises the following steps:

[0060] Step one: set the predetermined value range of the working parameters, the first control system 310 presets the adjustment time, and the third control system 330 sets the delay time.

[0061] Step two: judge the temperature of the alkali solution. When the temperature of the alkali solution is higher than or equal to the preset temperature, the hydrogen production device can be directly started quickly, otherwise, the cold start is performed. In the embodiment, the system is divided into hot standby and cold start state, and the hot standby and cold start of the device are defined with reference to the temperature of the alkali solution. In the embodiment, the preset temperature of the alkali solution can be set to 50℃, when the temperature of the alkali solution is equal to or higher than 50℃, the system is a hot standby device, at this time the hydrogen production device can be directly started quickly, and when the temperature of the alkali solution is lower than 50℃, the system is a cold start state, at this time the hydrogen production device can only be cold started. Of course, in other embodiments, the preset temperature of the alkali solution can be set to 48℃, 49℃, 51℃ or 52℃, etc.

[0062] Step three: when the working parameter implementation value of the hydrogen production device 100 exceeds the predetermined value range, the controller 300 adjusts the hydrogen production device 100 to make the working parameter implementation value of the hydrogen production device 100 return to the predetermined value range.

[0063] Step four: the first control system 310, the second control system 320 and the third control system 330 are arranged in the controller 300. The first control system 310 is used to receive the data of the sensor 200 and adjust the working state of the hydrogen production device 100 according to the data, and the second control system 320 is used to monitor whether the operation of the first control system 310 is normal. When the second control system 320 monitors that the operation of the first control system 310 is not normal, the second control system 320 makes the third control system 330 start working. The third control system 330 is used to receive the data of the sensor 200 and control the hydrogen production device 100 to stop working when the working parameter implementation value in the hydrogen production device 100 exceeds the predetermined value range.

[0064] The system executes the shutdown program after receiving the normal shutdown or interlock shutdown signal, works through the hydrogen and oxygen regulating valve, and gradually reduces the pressure. The caustic soda circulating pump works for more than half an hour, and the internal caustic soda performs natural cooling work. After the equipment shutdown is completed, the analyzer automatically cuts off by cutting off the electromagnetic valve, and at the same time, the external vent line is protected by nitrogen to avoid the influence of the battery.

[0065] When the equipment needs to be shut down, two modes can be considered. The first mode is that the current regulation is zero, and the hot standby state is automatically executed. The second mode is the fault shutdown state, in which the comprehensive fault point cannot automatically start the equipment. At this time, after artificial maintenance, it is restored to the automatic mode and continues to participate in automatic control.

[0066] In the first control system 310, a preset control time is also arranged. When the first control system 310 adjusts the working state of the hydrogen production device 100, if the first control system 310 does not make the hydrogen production device 100 return to the normal working state within the preset control time, the first control system 310 controls the hydrogen production device 100 to stop working, otherwise, the first control system 310 controls the hydrogen production device 100 to continue working.

[0067] It should be noted that the setting control time of each working parameter of the hydrogen production device 100 is independent of each other, that is, when the adjustment of the first working parameter is carried out, the adjustment of the second working parameter is also carried out at the same time. Even if the second working parameter has returned to the preset value range within 10 minutes, and the first working parameter still does not return to the preset value range after 10 minutes, the hydrogen production device 100 will still be stopped.

[0068] In addition, a delay circuit is also arranged in the third control system 330. When the working parameter implementation value in the hydrogen production device 100 exceeds the predetermined value range after the third control system 330 starts working, the delay circuit is triggered. During the triggering of the delay circuit, if the first control system 310 returns to normal working, the third control system 330 stops working, otherwise the third control system 330 makes the hydrogen production device 100 stop working.

[0069] The green electricity hydrogen production method disclosed in the embodiment can simultaneously adjust multiple hydrogen production devices 100, that is, multiple hydrogen production devices 100 can work simultaneously. At this time, the health values of each hydrogen production device 100 can be calculated respectively. When starting, each hydrogen production device 100 is started in turn from low to high health values.

[0070] Specifically, the electrolytic cell current I, the electrolytic cell total voltage U, the electrolytic cell working temperature T, the electrolytic cell running time H, the pump vibration value D, the start-stop number N, the chamber voltage consistency M, the set reference value X, and the set parameter reference value I0, Q0, U0, T0, H0, D0, N0 and M0 are extracted. Each hydrogen production device 100 is named from 1 to i. The health value calculation formula is: Qi=XiUi(1+(U0-Ui) / U0)+XiTi(1+(T0-Ti) / T0)+XiHi(1+(H0-Hi) / H0)+XiDi(1+(D0-Di) / D0)+XiNi(1+(N0-N i) / N0)+XiMi(1+(M0-Mi) / M0).

[0071] The health degree is sorted, so the execution logic is started in turn from low health degree to high health degree. The system is started in turn when the equipment reaches the minimum load. It needs to be emphasized that in addition to the health degree sorting, the state of the equipment start is to start the equipment in turn from the minimum load 20% to 40%. This setting can realize the rapid start of the system and ensure the qualified product gas.

[0072] During the stable operation of the system, when the system purity reaches 80% of the upper limit value, the dynamic power response of the equipment is stopped. When the chamber voltage evaluation M score is low or abnormal, the equipment is directly stopped and re-evaluated.

[0073] The embodiment also provides a green electricity hydrogen production method. The embodiment is a further improvement on the basis of the technical solutions of the above-mentioned embodiments. The technical solutions described in the above-mentioned embodiments are also applicable to the embodiment. The technical solutions disclosed in the above-mentioned embodiments are not repeated.

[0074] Specifically, the difference between the embodiment and the above-mentioned embodiments is that the green electricity hydrogen production method disclosed in the embodiment further comprises a step five: a preset downtime is set, after the hydrogen production device 100 stops working, it is judged whether the hydrogen production device 100 stops for more than the preset downtime, if not, the lye temperature is continuously maintained at the preset temperature, otherwise, the lye is stopped from being heated. In the embodiment, the preset downtime can be set to 7 days, that is, when the downtime of the hydrogen production device 100 does not reach 7 days, the lye will continue to be heated, so that the temperature of the lye dynamically reaches 50℃, so that the hydrogen production device 100 can be quickly started next time; if the hydrogen production device 100 is still not started after 7 days of downtime, the heating of the lye will be stopped.

[0075] The above only is the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A green electricity-to-hydrogen plant, characterized by, The application relates to a hydrogen production device, which comprises: a hydrogen production device; a sensor installed on the hydrogen production device, the sensor being used for monitoring the working parameters of the hydrogen production device; a controller electrically connected with the sensor and the hydrogen production device, the controller being used for receiving the data of the sensor and adjusting the working state of the hydrogen production device according to the data; wherein the controller is provided with a first control system, a second control system and a third control system, the first control system being used for receiving the data of the sensor and adjusting the working state of the hydrogen production device according to the data, the second control system being used for monitoring whether the first control system is normally operated, when the second control system monitors that the first control system is not normally operated, the second control system makes the third control system start to work, and the third control system is used for receiving the data of the sensor and controlling the hydrogen production device to stop working when the working parameters in the hydrogen production device exceed the predetermined value range.

2. The green electricity to hydrogen plant of claim 1, wherein, The application further comprises a temperature sensor for detecting the temperature of alkali liquor, the temperature sensor being connected with the controller, and the hydrogen production device can be directly started when the temperature of the alkali liquor is higher than or equal to the preset temperature.

3. The green electricity to hydrogen plant of claim 2, wherein, The controller further comprises a timing circuit, the timing circuit starting to time after the hydrogen production device stops working, the temperature of the alkali liquor being kept at the preset temperature during the timing of the timing circuit, and the alkali liquor is stopped to be heated after the timing of the timing circuit ends.

4. The green electric hydrogen plant according to any one of claims 1 to 3, characterized in that, The hydrogen production device is provided in a plurality of forms, the plurality of hydrogen production devices are electrically connected with the controller, and each of the hydrogen production devices is respectively provided with one sensor.

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