AEM water electrolysis hydrogen production system and control method

Abstract

The invention relates to an AEM water electrolysis hydrogen production system and a control method, and the system comprises an electrolytic cell module, a water tank module, a power supply module, a circulation module, a heat balance module, a purging module, a control module, a communication module and a display module. The functions of water replenishing of the water tank, direct current setting of the electrolytic bath, electrolyte circulation, electrolyte heat balance, startup purging, shutdown purging and the like are realized; the cold start time is shortened by controlling the technological process, and the hydrogen production efficiency is effectively improved; the service life of the electrolytic bath is effectively guaranteed by controlling the constant current output of the controllable direct-current power supply; safety production is effectively guaranteed through safety measures such as automatic purging of a triggering system; and the anti-risk capability is effectively improved by monitoring the running state of the equipment in real time and giving an alarm prompt.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment control, and more specifically to an AEM water electrolysis hydrogen production system and a control method. Background Art

[0002] In order to achieve the goal of carbon emission reduction, vigorously developing hydrogen energy has become a global consensus. The application of hydrogen energy in energy storage, power generation, transportation, metallurgy and chemical industry is gradually expanding. If we want to achieve large-scale application of hydrogen energy, the development of water electrolysis hydrogen production system and equipment is a crucial link;

[0003] There are four main ways of producing hydrogen by water electrolysis, including alkaline water electrolysis (AWE), proton exchange membrane water electrolysis (PEM), high-temperature solid oxide water electrolysis (SOE) and solid polymer anion exchange membrane water electrolysis (AEM). Among them, AEM water electrolysis has the characteristics of low cost, high efficiency and strong controllability.

[0004] However, there are certain dangers in the process of AEM water electrolysis to produce hydrogen, and the equipment needs to adapt to different operating environments. The existing AEM water electrolysis hydrogen production system and control method have problems such as poor reliability, low efficiency, and complex control. Therefore, it is very important to design a safe, reliable, efficient, simple and precise AEM water electrolysis hydrogen production system and control method. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing AEM water electrolysis hydrogen production system and control method have poor reliability, low efficiency and complex control. In view of the above-mentioned defects of the prior art, a safe, reliable, efficient, simple and precise AEM water electrolysis hydrogen production system and control method are provided.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] An AEM water electrolysis hydrogen production system is constructed, which includes:

[0008] An electrolytic cell module, wherein the electrolytic cell module comprises an electrolytic cell, wherein the electrolytic cell is provided with a battery stack and a first voltage sensor, wherein the battery stack is composed of a plurality of single-mode batteries, and the first voltage sensor is used to detect the voltage of each single-mode battery;

[0009] A power supply module, the power supply module comprising a reaction power supply, a current sensor and a second voltage sensor, the reaction power supply is used to supply power to the electrolytic cell, the current sensor is used to detect the output current of the reaction power supply, and the second voltage sensor is used to detect the output voltage of the reaction power supply;

[0010] A water tank module, the water tank module comprising a water tank, a water inlet pipe, a liquid level sensor and a water replenishment solenoid valve; the liquid level sensor is arranged in the water tank, the liquid level sensor is used to detect the liquid level of the water tank, the water inlet pipe is connected to the water tank, and the water replenishment solenoid valve is arranged in the water inlet pipe;

[0011] An electrolyte circulation module, the electrolyte circulation module comprising an electrolyte input pipeline, a water pump and a flow sensor, the water pump and the flow sensor are arranged in the electrolyte input pipeline;

[0012] An electrolyte heat balance module, the electrolyte heat balance module comprising an electrolyte return pipe, a temperature sensor, a heat exchanger and a cooling fan, wherein the temperature sensor, the heat exchanger and the cooling fan are all arranged in the electrolyte return pipe;

[0013] A purge module, the purge module comprising a gas pipeline, a purge pipeline, a pressure sensor, a gas valve, and a purge solenoid valve; the gas pipeline is connected to the electrolyzer, the purge pipeline is connected to the hydrogen pipeline, the gas valve is arranged in the gas pipeline, the pressure sensor is arranged on the cathode side of the electrolyzer, and the purge solenoid valve is arranged in the purge pipeline;

[0014] A control module, the control module is used to control the electrolytic cell module, the water tank module, the power module, the electrolyte circulation module, the electrolyte heat balance module and the purge module;

[0015] A display module, wherein the display module is used to realize human-computer interaction;

[0016] A communication module, which is used for data transmission between different modules;

[0017] The electrolyte circulation module and the electrolyte heat balance module are both located between the water tank module and the electrolyzer module, and are both connected to the first end of the electrolyzer module and the water tank module; the second end of the electrolyzer module is connected to the purge module, and the third end of the electrolyzer module is fixedly connected to the power module; the water tank module, the electrolyte circulation module, the electrolyte heat balance module, the electrolyzer module, the power module and the display module are all electrically connected to the control module; the control module is electrically connected to the communication module.

[0018] A control method for an AEM water electrolysis hydrogen production system comprises the following steps:

[0019] Refill water through the preset water tank module;

[0020] Performing electrolyte circulation through a preset electrolyte circulation module;

[0021] Setting the voltage and current of the electrolytic cell by a preset power module;

[0022] Balancing the temperature of the electrolyte through a preset electrolyte heat balance module;

[0023] The mixed gas is purged and residual hydrogen is purged through the preset purge module.

[0024] Furthermore, the step of replenishing water through the preset water tank module also includes:

[0025] Powered by a preset main power supply;

[0026] Detecting the liquid level of the water tank module through a preset liquid level sensor and obtaining it;

[0027] determining whether the liquid level reaches the middle level or is below;

[0028] If yes, open the water replenishment solenoid valve to replenish the water tank;

[0029] If not, keep the water replenishment solenoid valve closed.

[0030] Furthermore, the step of circulating the electrolyte by means of a preset electrolyte circulation module further includes:

[0031] Turn on a preset water pump and set the speed of the water pump;

[0032] The electrolyte in the water tank is transported to a preset electrolytic cell by the water pump;

[0033] The electrolyte flow rate is detected and acquired through a preset flow sensor.

[0034] Furthermore, the step of setting the voltage and current of the electrolytic cell by a preset power module further includes:

[0035] Determining whether the electrolyte flow rate reaches a set value;

[0036] If yes, output the set first control voltage to the reaction power supply;

[0037] The reaction power supply outputs a corresponding output voltage and supplies power to a preset battery stack;

[0038] Detecting the single-mode voltage value of each preset single-mode battery by a preset first voltage sensor, and detecting the threshold of the output voltage by a preset second voltage sensor;

[0039] Determining whether each of the single-mode voltage values ​​exceeds a set first voltage value;

[0040] If yes, reducing the single-mode voltage value according to a preset frequency and amplitude by using the first control voltage until any of the single-mode voltage values ​​is lower than the first voltage value;

[0041] If not, the set first control voltage is increased according to the frequency and the amplitude until the output voltage reaches the set voltage.

[0042] Further, if not, then after the step of increasing the set first control voltage according to the frequency and the amplitude until the output voltage reaches the set voltage, the method further includes:

[0043] Detecting the output current value of the reaction power supply through a preset current sensor and obtaining it;

[0044] Adjusting the output voltage until the output current value is within a set constant current value range;

[0045] Determining whether the output current value reaches a set constant current value;

[0046] If it is lower than 95% of the constant current value, a warning is issued through a preset display module;

[0047] If it is lower than 80% of the constant current value, an alarm will be triggered and the machine will be shut down.

[0048] Furthermore, the step of balancing the temperature of the electrolyte by a preset electrolyte heat balance module further includes:

[0049] The electrolyte temperature is detected and acquired through a preset temperature sensor;

[0050] Determining whether the electrolyte temperature is higher than a set temperature value;

[0051] If so, a preset heat exchanger and a preset cooling fan are turned on, wherein the heat exchanger cools the electrolyte until the temperature reaches the temperature value, and the cooling fan discharges the heat.

[0052] Furthermore, the step of purging the mixed gas and the residual hydrogen through a preset purge module further includes:

[0053] Mixed gas detection: Detect the mixed gas pressure value through the preset pressure sensor and obtain it;

[0054] Mixed gas pressure judgment: judging whether the mixed gas pressure value is greater than a set first pressure value;

[0055] Mixed gas purging: If yes, then open the preset purge solenoid valve, and the purge solenoid valve discharges the mixed gas from the preset purge pipeline within the set first time;

[0056] If not, repeat the steps of mixed gas detection and mixed gas pressure judgment until the mixed gas pressure value is greater than the first pressure value; wherein, when the mixed gas pressure is still less than the set first pressure value after exceeding the set second time, an error alarm is issued through the preset display module.

[0057] Further, the mixed gas purging: if yes, then opening a preset purge solenoid valve, the purge solenoid valve discharges the mixed gas from a preset purge pipe within a set first time, after the step, comprising:

[0058] Determining whether the number of times the mixed gas is purged is less than a set first number;

[0059] If yes, repeating the steps of mixed gas detection, mixed gas pressure determination and mixed gas purging until the first number of times is reached;

[0060] If not, the purge solenoid valve is closed, and the hydrogen generated by the electrolyzer is delivered through a preset gas delivery valve.

[0061] Further, if not, the step of closing the purge solenoid valve and delivering the hydrogen generated by the electrolyzer through a preset gas delivery valve comprises:

[0062] Receiving a preset shutdown command;

[0063] Hydrogen detection: detecting the hydrogen pressure value through the pressure sensor and obtaining it;

[0064] Hydrogen pressure judgment: judging whether the hydrogen pressure value is greater than a set second pressure value;

[0065] If not, shut down;

[0066] Hydrogen purge: if yes, open the purge solenoid valve, wherein the purge solenoid valve discharges the residual hydrogen from the purge pipeline within a set third time;

[0067] Repeat the steps of hydrogen detection, hydrogen pressure determination and hydrogen purging until the hydrogen pressure value is less than the second pressure value; wherein, when the hydrogen pressure value is still greater than the second pressure value after being repeated for more than a set second number of times, an error alarm is issued through the display module.

[0068] The present invention also provides a computer device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor executes the computer program to implement the steps in any one of the above methods.

[0069] The present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of any of the above methods are implemented.

[0070] The present invention provides an AEM water electrolysis hydrogen production system and control method, which has the following beneficial effects:

[0071] The present invention relates to an AEM water electrolysis hydrogen production system and a control method. The system comprises an electrolyzer module, a water tank module, a power module, a circulation module, a heat balance module, a purge module, a control module, a communication module and a display module, and realizes functions such as water tank water replenishment, electrolyzer DC current setting, electrolyte circulation, electrolyte heat balance, startup purge and shutdown purge. The present invention effectively improves the hydrogen production efficiency by reducing the cold start time by controlling the process flow; effectively guarantees the service life of the electrolyzer by controlling the constant current output of the reaction power supply; effectively guarantees safe production by triggering safety measures such as automatic purge of the system; and effectively improves the risk resistance capability by real-time monitoring of the equipment operation status and alarm prompts. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 This is an overall block diagram of an AEM water electrolysis hydrogen production system in one embodiment of the present invention;

[0073] Figure 2 A schematic diagram of the method steps of a control method of an AEM water electrolysis hydrogen production system in the present invention;

[0074] Figure 3 It is a schematic diagram of the specific method steps for realizing water replenishment of the water tank module in the present invention;

[0075] Figure 4 It is a schematic diagram of the specific method steps for realizing electrolyte circulation in the present invention;

[0076] Figure 5 It is a schematic diagram of the specific method steps for setting the voltage and current of the electrolytic cell in the present invention;

[0077] Figure 6 It is a schematic diagram of the specific method steps for achieving thermal balance of the electrolyte in the present invention;

[0078] Figure 7 It is a schematic diagram of the specific method steps for achieving mixed gas purging in the present invention;

[0079] Figure 8 It is a schematic diagram of the specific method steps for achieving residual hydrogen purging in the present invention;

[0080] Fig. 9 The present invention is a structural block diagram of a computer device.

[0081] Explanation of reference numerals: 1. Control module; 2. Communication module; 3. Display module; 4. Electrolyzer module; 5. Power module; 6. Water tank module; 7. Electrolyte circulation module; 8. Electrolyte heat balance module; 9. Purge module. DETAILED DESCRIPTION

[0082] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0083] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0084] Please refer to the attached Figure 1 The present invention proposes an AEM water electrolysis hydrogen production system, comprising:

[0085] The electrolytic cell module 4 includes an electrolytic cell, the electrolytic cell is provided with a battery stack and a first voltage sensor, the battery stack is composed of a plurality of single-mode batteries, and the first voltage sensor is used to detect the voltage of the single-mode battery;

[0086] The power module 5 includes a reaction power supply, a current sensor and a second voltage sensor. The reaction power supply is used to receive the control voltage of the control module 1 and convert it into an output voltage to supply power to the electrolytic cell. The current sensor and the second voltage sensor are both arranged between the reaction power supply and the electrolytic cell. The current sensor is used to detect the output current of the reaction power supply, and the second voltage sensor is used to detect the output voltage of the reaction power supply.

[0087] The water tank module 6 includes a water tank, a water inlet pipe, a liquid level sensor and a water supply solenoid valve; the liquid level sensor is arranged in the water tank, the water inlet pipe is fixedly connected to the water tank, and the water supply solenoid valve is arranged in the water inlet pipe;

[0088] The electrolyte circulation module 7 includes an electrolyte input pipeline, a water pump and a flow sensor, and the water pump and the flow sensor are arranged in the electrolyte input pipeline;

[0089] The electrolyte heat balance module 8, the electrolyte circulation and heat balance module includes an electrolyte return pipe, a temperature sensor, a heat exchanger and a cooling fan, and the temperature sensor, the heat exchanger and the cooling fan are all arranged in the electrolyte return pipe;

[0090] The purge module 9 includes a gas pipeline, a purge pipeline, a pressure sensor, a gas valve, and a purge solenoid valve; the gas pipeline is fixedly connected to the electrolyzer, the purge pipeline is fixedly connected to the hydrogen pipeline, the gas valve is arranged in the gas pipeline, the hydrogen pressure sensor is arranged between the electrolyzer and the gas valve, and the purge solenoid valve is arranged in the purge pipeline;

[0091] Control module 1, control module 1 is used to control power module 5, water tank module 6, electrolyte circulation module 7, electrolyte heat balance module 8 and purge module 9;

[0092] Communication module 2, communication module 2 is used for data transmission between different modules;

[0093] Display module 3, display module 3 is used to realize human-computer interaction;

[0094] The electrolyte circulation module 7 and the electrolyte heat balance module 8 are both located between the water tank module 6 and the electrolyzer module 4, and one end of each is connected to the water tank module 6, and the other end of each is connected to the first end of the electrolyzer module 4; the second end of the electrolyzer module 4 is connected to the purge module 9, and the third end of the electrolyzer module 4 is fixedly connected to the power module 5; the water tank module 6, the electrolyte circulation module 7, the electrolyte heat balance module 8, the electrolyzer module 4, the power module 5 and the display module 3 are all electrically connected to the control module 1; the control module 1 is electrically connected to the communication module 2.

[0095] In this embodiment, the electrolytic cell module 4 includes an electrolytic cell, the electrolytic cell is provided with a battery stack and a first voltage sensor, the battery stack is composed of a plurality of single-mode batteries, each single-mode battery is provided with a first voltage sensor, and the first sensor is used to measure the voltage of the single-mode battery;

[0096] The power module 5 includes a reaction power supply, a current sensor and a second voltage sensor. The entire AEM water electrolysis hydrogen production system adopts an AC 220V mains power distribution with a phase current of 16A. The electrolyzer uses DC power for electrolysis. The reaction power supply converts the 220V AC power into DC power. The reaction power supply is a 0-48V output adjustable DC power supply with a power of 3200W. The reaction power supply is independently controlled by the controller through output voltage. The reaction power supply receives the control voltage of the control module 1 and converts it into an output voltage to power the electrolyzer. The current sensor and the second voltage sensor are both arranged between the reaction power supply and the electrolyzer to detect the current and voltage received by the electrolyzer stack. In addition, a 24V switching power supply with a power of 240W is also provided to power other modules. The power distribution cabin is physically isolated from the electrolysis cabin. The internal design of the electric cabin includes components such as a leakage protection switch, an electromagnetic filter and a solid-state relay, which can effectively prevent hydrogen from leaking into the electric cabin and causing safety accidents.

[0097] The water tank module 6 includes a water tank, a water inlet pipe, a liquid level sensor and a water supply solenoid valve; the liquid level sensor is arranged in the water tank to measure the liquid level in the water tank, the water inlet pipe is connected and fixedly connected to the water tank, and the water supply solenoid valve is arranged in the water inlet pipe. In addition, a water tank pressure sensor is also provided to detect the water tank status in real time;

[0098] The electrolyte circulation module 7 includes an electrolyte input pipeline, a water pump and a flow sensor. The water pump and the flow sensor are arranged in the electrolyte input pipeline. The water pump is used to promote electrolyte circulation. The flow sensor is used to measure the electrolyte flow entering the electrolytic cell. The electrolyte in the water tank is driven by the circulating water pump, passes through the electrolyte input pipeline, the electrolytic cell and finally returns to the water tank through the electrolyte return pipeline. At the same time, the circulation can achieve "stirring" of the electrolytic reaction area in the electrolytic cell, reduce the concentration difference between the positive and negative levels of the electrolytic cell, and improve the electrolysis efficiency.

[0099] The electrolyte heat balance module 8 includes an electrolyte circulation and heat balance module, which includes an electrolyte return pipe, a temperature sensor, a heat exchanger and a cooling fan. The temperature sensor, the heat exchanger and the cooling fan are all arranged in the electrolyte return pipe. The temperature sensor is used to measure the temperature of the reflux electrolyte, the heat exchanger is used to cool the electrolyte, and the cooling fan is used to discharge the excess heat of the electrolyte out of the system.

[0100] The purge module 9 includes a gas pipeline, a purge pipeline, a pressure sensor, a gas valve and a purge solenoid valve; the gas pipeline is connected to the cathode side of the electrolyzer, the purge pipeline is connected to the hydrogen pipeline, the gas valve is arranged in the gas pipeline, the pressure sensor is arranged between the electrolyzer and the gas valve, the pressure sensor is used to measure the hydrogen pressure, the purge solenoid valve is arranged in the purge pipeline, and the purge solenoid valve is used to discharge the mixed gas and liquid; in a specific embodiment, the gas valve is a 1.6Mpa one-way valve, and a hydrogen filter is also provided on the cathode side of the electrolyzer. When the hydrogen passes through the filter and the pressure is greater than 1.6Mpa, the hydrogen is discharged through the gas valve and stored, so that a relatively pure product hydrogen can be obtained;

[0101] Control module 1, the main controller is a multi-function control circuit board developed based on Mitsubishi FX-2N series PLC programmable logic controller, which can monitor the running status of electrolyzed water, and alarm or safely shut down after detecting abnormal information; it has 16ch input and output, 6ch analog input, 2ch temperature detection, 2ch analog output, 24ch voltage detection, 2ch high-speed pulse PWM output, 3ch high-speed pulse counting input, where ch refers to channel, that is, independent interface; it can realize the functions of electrolytic cell DC current setting, electrolytic cell single-mode voltage detection, cooling fan and water pump speed setting and feedback, water replenishment and purge solenoid valve control, etc.

[0102] Display module 3, using a touch screen, for realizing human-computer interaction;

[0103] Communication module 2: Communication module 2 is used for data transmission between different modules. The main control board and the display screen exchange data through the RS-485 interface Modbus-RTU communication protocol.

[0104] The electrolyte circulation module 7 and the electrolyte heat balance module 8 are both located between the water tank module 6 and the electrolyzer module 4, and one end of each is connected to the water tank module 6, and the other end of each is connected to the first end of the electrolyzer module 4; the second end of the electrolyzer module 4 is connected to the purge module 9, and the third end of the electrolyzer module 4 is fixedly connected to the power module 5; the water tank module 6, the electrolyte circulation module 7, the electrolyte heat balance module 8, the electrolyzer module 4, the power module 5 and the display module 3 are all electrically connected to the control module 1; the control module 1 is electrically connected to the communication module 2.

[0105] Please refer to Figure 2 , is a control method for an AEM water electrolysis hydrogen production system in one embodiment of the present invention, comprising:

[0106] S1: replenishing water through the preset water tank module 6;

[0107] S2: Circulating the electrolyte through a preset electrolyte circulation module 7;

[0108] S3: Setting the voltage and current of the electrolytic cell through a preset power module 5;

[0109] S4: Balancing the temperature of the electrolyte through a preset electrolyte heat balance module 8;

[0110] S5: Purge the mixed gas and perform residual hydrogen purge through the preset purge module 9.

[0111] In the above steps, water is firstly replenished through the water tank module 6. In a specific embodiment, the entire AEM water electrolysis hydrogen production system adopts AC 220V mains power distribution, phase current 16A, and except for the electrolyzer, other modules are controlled by a switch power supply with a voltage of 24V and a power of 240W; then water is replenished through the water tank module 6. Specifically, when the water level in the water tank module 6 is low, water is added to the water tank from the outside by opening the water replenishment solenoid valve; then the electrolyte circulation is realized through the electrolyte circulation module 7; specifically, the electrolyte in the water tank flows through the electrolyzer through a preset water pump and finally returns to the water tank; then, the electrolyzer is powered by the power supply module 5. Specifically, the electrolyzer requires direct current, and the reaction power supply converts AC220 V alternating current is converted into direct current, and the control module 1 controls the output voltage of the reaction power supply to gradually increase. After the voltage is increased to the set value, the reaction power supply is controlled to output a constant current to power the electrolyzer; then, the electrolyte heat balance is achieved through the electrolyte heat balance module 8. Specifically, the electrolyte is cooled through a heat exchanger, and the heat is removed from the system through a cooling fan; then, the early mixed gas is purged through the purge module 9; specifically, the hydrogen produced in the early stage of the electrolyzer is likely to be a mixed gas, and the early mixed gas is discharged from the system through a purge solenoid valve; finally, the shutdown purge is achieved through the purge module 9; specifically, when the shutdown command is received, there is residual hydrogen in the electrolyzer and the pipeline, and the residual hydrogen is discharged through the purge solenoid valve.

[0112] The present invention relates to an AEM water electrolysis hydrogen production system and a control method. The system comprises an electrolyzer module 4, a water tank module 6, a power module 5, an electrolyte circulation module 7, an electrolyte heat balance module 8, a purge module 9, a control module 1, a communication module 2 and a display module 3, and realizes functions such as water tank water replenishment, electrolyzer constant current setting, electrolyte circulation, electrolyte heat balance, startup purge and shutdown purge. The present invention effectively improves the hydrogen production efficiency by reducing the cold start time by controlling the process flow. In a specific embodiment, the cold start time refers to the time from the startup of the AEM water electrolysis hydrogen production system to the stable operation of the system. Through the precise control method, the modules are precisely coordinated to enable the hydrogen production system to quickly reach the set hydrogen production rate, effectively improve the hydrogen production efficiency, and avoid time waste; the service life of the electrolyzer is effectively guaranteed by the constant current output control of the reaction power supply; safe production is effectively guaranteed by triggering safety measures such as automatic purge of the system; and the risk resistance is effectively improved by real-time monitoring of the equipment operation status and alarm prompts.

[0113] Please refer to Figure 3 The step of replenishing water through the preset water tank module 6 also includes:

[0114] Powered by a preset main power supply;

[0115] The liquid level of the water tank is detected by the liquid level sensor and sent to the control module 1;

[0116] When the control module 1 determines that the liquid level in the water tank reaches the middle level or below, the control module 1 opens the water replenishment solenoid valve to replenish water in the water tank;

[0117] When the control module 1 determines that the liquid level in the water tank reaches a high level, the water replenishment solenoid valve is closed through the control module 1.

[0118] In specific implementation: power is supplied by a preset total power supply. In a specific embodiment, the entire AEM water electrolysis hydrogen production system adopts AC 220V mains power distribution with a phase current of 16A. Except for the electrolyzer, other modules are controlled by a switching power supply with a voltage of 24V and a power of 240W, and power supply and power failure are achieved by a switch button; the liquid level sensor detects the water tank liquid level in real time and sends it to the control module 1. When the control module 1 determines that the water tank liquid level reaches the middle level or below, the control module 1 opens the water supply solenoid valve and adds water to the water tank from the outside until the water tank liquid level reaches the high level, and the control module 1 closes the water supply solenoid valve.

[0119] Please refer to Figure 4 The step of circulating the electrolyte by the preset electrolyte circulation module 7 further includes:

[0120] Turn on the water pump through the control module 1 and set the speed of the water pump;

[0121] The electrolyte in the water tank is transported to the electrolytic cell by a water pump;

[0122] The electrolyte flow rate is detected by a flow sensor and sent to the control module 1.

[0123] During the specific implementation: the control module 1 turns on the water pump and sets the water pump speed. The water pump transports the electrolyte in the water tank to the electrolytic cell. The flow sensor detects the electrolyte flow and sends it to the control module 1. The control module 1 feeds back the water pump speed according to the electrolyte flow to achieve the optimal circulation speed. At the same time, the circulation can "stir" the electrolytic reaction area in the electrolytic cell to reduce the concentration difference between the two stages of the electrolytic cell, which is beneficial to improving the electrolysis efficiency and reducing power consumption.

[0124] Please refer to Figure 5 The step of setting the voltage and current of the electrolytic cell by the preset power module 5 also includes:

[0125] When the control module 1 determines that the water flow rate reaches the set value, the control module 1 outputs the set control voltage and sends it to the reaction power supply;

[0126] The reaction power supply converts the set control voltage into output voltage, and supplies the output voltage to the battery stack;

[0127] Detecting the voltage of the single-mode battery by a first voltage sensor;

[0128] Detecting the output voltage of the reaction power supply by a second voltage sensor;

[0129] Determine, by control module 1, whether the voltage of any single-mode battery exceeds a set first voltage;

[0130] If yes, the control module 1 reduces the set control voltage at the set frequency until the voltage of any single-mode battery is lower than the set first voltage;

[0131] If not, the control module 1 increases the set control voltage at the set frequency until the output voltage value reaches the preset second voltage;

[0132] The output current value of the reaction power supply is detected by the current sensor and sent to the control module 1;

[0133] The output voltage value of the reaction power supply is controlled by the control module 1 using the PID control method, so that the output current value of the reaction power supply at the set hydrogen production rate reaches the set constant current value range;

[0134] Determine whether the output current reaches the set constant current value through the control module 1;

[0135] If it is lower than 95% of the set constant current value, the display module 3 will report a "power supply output voltage triggers the high limit" warning;

[0136] If it is lower than 80% of the set constant current value, an alarm will be triggered and the machine will be shut down.

[0137] In specific implementation: when the control module 1 determines that the water flow rate reaches the set value, the control module 1 outputs a control voltage between 1.1V and 3.7V to the reaction power supply, the reaction power supply receives the control voltage and outputs the corresponding output voltage to power the electrolytic cell. At the same time, the voltage of each single-mode battery is detected in real time by the first voltage sensor and sent to the control module 1, and the output voltage of the reaction power supply is detected by the second voltage sensor and sent to the control module 1. The control module 1 determines whether there is a single-mode battery with a voltage greater than or equal to 2.2V. If so, the control voltage is reduced by 0.1V every 2s by the control module 1 until the control module 1 determines that the voltage of each single-mode battery is less than 2.2V. If it still exists after 5 minutes, If the single-mode voltage is greater than or equal to 2.2V, the shutdown alarm is issued. If not, the control voltage is increased by 0.1V every 2s through the control module 1 until the control module 1 detects that the output voltage of the reaction voltage reaches 48V. Then, the output current of the reaction power supply is detected by the current sensor and sent to the control module 1. The control module 1 controls the output voltage value of the reaction power supply through PID so that the output current of the reaction power supply is a constant value at a hydrogen yield of 100%, and the constant current is 52A. At the same time, the control module 1 determines whether the output current reaches the constant current value. If it is lower than 95% of the set constant current value, the display module 3 reports a "power supply output voltage triggers the high limit" warning. If it is lower than 80% of the set constant current value, an alarm is issued to shut down.

[0138] Please refer to Figure 6 The step of achieving electrolyte heat balance in the electrolytic cell by the electrolyte heat balance module 8 further includes:

[0139] The electrolyte temperature is detected by a temperature sensor and sent to the control module 1;

[0140] When the control module 1 determines that the electrolyte temperature is higher than the set temperature, the control module 1 turns on the heat exchanger and the cooling fan. The heat exchanger cools the electrolyte until it reaches the set temperature, and the cooling fan discharges heat from the system.

[0141] In specific implementation: the hydrogen production process must be supplied with electricity, the electricity consumed in the water electrolysis process exceeds the theoretical heat absorption of the water electrolysis reaction, and the excess is mainly taken away by the circulating electrolyte to maintain the normal temperature of the electrolysis reaction zone. The electrolyte temperature is detected by a temperature sensor and sent to the control module 1. When the control module 1 determines that the electrolyte temperature is higher than 55°C, the control module 1 turns on the heat exchanger, and the heat exchanger dissipates the heat of the electrolyte. The cooling fan is turned on by the control module 1, and the optimal speed of the cooling fan is set according to the temperature feedback to discharge the heat from the system, so that the electrolyte temperature is maintained at about 55°C. At this temperature, the hydrogen production efficiency is highest. In another specific embodiment, a heater can also be provided to heat the electrolyte when the electrolyte temperature is lower than 55°C.

[0142] Please refer to Figure 7 The step of purging the mixed gas and the residual hydrogen through the preset purge module 9 also includes:

[0143] Mixed gas detection: Detect the mixed gas pressure value through the preset pressure sensor and obtain it;

[0144] Mixed gas pressure judgment: judge whether the mixed gas pressure value is greater than the set first pressure value;

[0145] Please refer to Figure 7 Mixed gas purging: If yes, then open the preset purge solenoid valve, and the purge solenoid valve discharges the mixed gas from the preset purge pipe within the preset first time;

[0146] If not, the steps of mixed gas detection and mixed gas pressure determination are repeated until the mixed gas pressure value is greater than the first pressure value; wherein, when the mixed gas pressure is still less than the set first pressure value after exceeding the set second time, an error alarm is issued through the preset display module 3;

[0147] Determine whether the number of mixed gas purges is less than a set first number;

[0148] If yes, repeat the steps of mixed gas detection, mixed gas pressure determination and mixed gas purging until the first number is reached;

[0149] If not, the purge solenoid valve is closed and the hydrogen produced by the electrolyzer is delivered through the preset gas delivery valve.

[0150] In specific implementation: when the entire hydrogen production is connected to the main power supply, the control module 1 opens the purge solenoid valve to evacuate the gas remaining in the system after the previous hydrogen production; after the reaction power boost is completed, hydrogen is gradually generated at the cathode of the electrolyzer. The gas generated in the early stage is mostly mixed gas. The pressure value of the mixed gas is detected by the pressure sensor and sent to the control module 1. The control module 1 determines whether the pressure value of the mixed gas is greater than or equal to 2 bar. If not, the pressure value of the mixed gas is repeatedly detected and determined. If the pressure of the mixed gas is less than 2 bar after 10 minutes, the display module 3 reports an "electrolyzer equipment failure" error. If so, the control module Block 1 opens the purge solenoid valve and keeps it open for 3 seconds. The purge solenoid valve discharges the mixed gas from the purge pipe within 3 seconds and then closes. When the mixed gas pressure is greater than or equal to 2 bar again, the purge solenoid opens again and discharges the mixed gas within 3 seconds and then closes. Exhausting the mixed gas twice in the early stage of hydrogen production is beneficial to ensure the purity of hydrogen and system safety; the hydrogen produced then passes through the filter and is transported to the storage bin through a 1.6Mpa one-way gas valve. Since the hydrogen produced by electrolysis has a certain humidity and water will accumulate in the pipeline when it is cooled after passing through the filter, the solenoid valve will open the purge solenoid valve for 0.5s every 10 minutes to discharge the accumulated water.

[0151] Please refer to Figure 8 The step of purging the mixed gas and the residual hydrogen through the preset purge module 9 also includes:

[0152] Receiving a preset shutdown command through the control module 1;

[0153] Detection: Detect the hydrogen pressure value through the pressure sensor and send it to the control module 1;

[0154] Determination: Determine whether the hydrogen pressure value is greater than the set hydrogen pressure value through the control module 1;

[0155] If not, the AEM water electrolysis hydrogen production system is shut down through the control module 1;

[0156] Purge: If yes, the purge solenoid valve is opened by the control module 1 and lasts for a set third time, and the purge solenoid valve discharges the residual hydrogen from the purge pipe within the set third time and then closes;

[0157] After waiting for the set fourth time, the detection, judgment and purging steps are repeated until the control module 1 determines that the hydrogen pressure value is less than the set hydrogen pressure value; if the hydrogen pressure value is still greater than the set hydrogen pressure value after the detection, judgment and purging steps are repeated for the set second number of times, an error alarm is issued through the display module 3.

[0158] In specific implementation: when the control module 1 receives a preset shutdown command, the control module 1 opens the purge solenoid valve and maintains it for 0.5s. The purge solenoid valve discharges the residual hydrogen in the system from the purge pipe within 0.5s and then closes. The hydrogen pressure value is detected by the pressure sensor and sent to the control module 1. The control module 1 determines whether the hydrogen pressure value is greater than 0.1bar. If not, the control module 1 is shut down. If so, the detection, judgment and purge steps are repeated after 5s until the control module 1 determines that the hydrogen pressure value is less than 0.1bar. The solenoid valve is energized for purge for up to 8 times to ensure that the hydrogen concentration in the hydrogen pipeline is away from the flammable and explosive range (hydrogen accounts for 4% to 75.6% of the air volume concentration). If the hydrogen pressure is still greater than 0.1bar after 8 purges, a "purge abnormality" error is reported.

[0159] Reference Fig. 9 A computer device includes a memory and a processor, wherein a computer program is stored in the memory. The computer device may be a server, and its internal structure is as follows: Fig. 9 As shown. The computer device includes a processor, a memory, a network interface and a database. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory is the operating system, computer program and database in the non-volatile storage medium. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store data such as preset thresholds, templates, tables, etc. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the control method of the AEM water electrolysis hydrogen production system is implemented.

[0160] Those skilled in the art will understand that Fig. 9 The structure shown in is merely a block diagram of a portion of the structure related to the present application solution and does not constitute a limitation on the computer device to which the present application solution is applied.

[0161] An embodiment of the present application also provides a computer storage medium on which a computer program is stored. When the computer program is executed by a processor, a control method for an AEM water electrolysis hydrogen production system is implemented.

[0162] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing related hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media provided in this application and used in the embodiments may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0163] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, device, article or method including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, device, article or method. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, device, article or method including the element.

[0164] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An AEM water electrolysis hydrogen production system, characterized in that: include: An electrolytic cell module, wherein the electrolytic cell module comprises an electrolytic cell, wherein the electrolytic cell is provided with a battery stack and a first voltage sensor, wherein the battery stack is composed of a plurality of single-mode batteries, and the first voltage sensor is used to detect the voltage of each single-mode battery; A power supply module, the power supply module comprising a reaction power supply, a current sensor and a second voltage sensor, the reaction power supply is used to supply power to the electrolytic cell, the current sensor is used to detect the output current of the reaction power supply, and the second voltage sensor is used to detect the output voltage of the reaction power supply; A water tank module, the water tank module comprising a water tank, a water inlet pipe, a liquid level sensor and a water replenishment solenoid valve; the liquid level sensor is arranged in the water tank, the liquid level sensor is used to detect the liquid level of the water tank, the water inlet pipe is connected to the water tank, and the water replenishment solenoid valve is arranged in the water inlet pipe; An electrolyte circulation module, the electrolyte circulation module comprising an electrolyte input pipeline, a water pump and a flow sensor, the water pump and the flow sensor are arranged in the electrolyte input pipeline; An electrolyte heat balance module, the electrolyte heat balance module comprising an electrolyte return pipe, a temperature sensor, a heat exchanger and a cooling fan, wherein the temperature sensor, the heat exchanger and the cooling fan are all arranged in the electrolyte return pipe; A purge module, the purge module comprising a gas pipeline, a purge pipeline, a pressure sensor, a gas valve, and a purge solenoid valve; the gas pipeline is connected to the electrolyzer, the purge pipeline is connected to the hydrogen pipeline, the gas valve is arranged in the gas pipeline, the pressure sensor is arranged on the cathode side of the electrolyzer, and the purge solenoid valve is arranged in the purge pipeline; A control module, the control module is used to control the electrolytic cell module, the water tank module, the power module, the electrolyte circulation module, the electrolyte heat balance module and the purge module; A display module, wherein the display module is used to realize human-computer interaction; A communication module, which is used for data transmission between different modules; The electrolyte circulation module and the electrolyte heat balance module are both located between the water tank module and the electrolyzer module, and are both connected to the first end of the electrolyzer module and the water tank module; the second end of the electrolyzer module is connected to the purge module, and the third end of the electrolyzer module is fixedly connected to the power module; the water tank module, the electrolyte circulation module, the electrolyte heat balance module, the electrolyzer module, the power module and the display module are all electrically connected to the control module; the control module is electrically connected to the communication module.

2. A control method for an AEM water electrolysis hydrogen production system, characterized in that: The following steps are involved: Refill water through the preset water tank module; Performing electrolyte circulation through a preset electrolyte circulation module; Setting the voltage and current of the electrolytic cell by a preset power module; Balancing the temperature of the electrolyte through a preset electrolyte heat balance module; The mixed gas is purged and residual hydrogen is purged through the preset purge module.

3. The control method of the AEM water electrolysis hydrogen production system according to claim 2, characterized in that: The step of replenishing water through the preset water tank module also includes: Powered by a preset main power supply; Detecting the liquid level of the water tank module through a preset liquid level sensor and obtaining it; determining whether the liquid level reaches the middle level or is below; If yes, open the water replenishment solenoid valve to replenish the water tank; If not, keep the water replenishment solenoid valve closed.

4. The control method of the AEM water electrolysis hydrogen production system according to claim 2, characterized in that: The step of circulating the electrolyte by means of a preset electrolyte circulation module further includes: Turn on a preset water pump and set the speed of the water pump; The electrolyte in the water tank is transported to a preset electrolytic cell by the water pump; The electrolyte flow rate is detected and acquired through a preset flow sensor.

5. The control method of the AEM water electrolysis hydrogen production system according to claim 2, characterized in that: The step of setting the voltage and current of the electrolytic cell by a preset power module also includes: Determining whether the electrolyte flow rate reaches a set value; If yes, output the set first control voltage to the preset reaction power supply; The reaction power supply outputs a corresponding output voltage and supplies power to a preset battery stack; Detecting the single-mode voltage value of each preset single-mode battery by a preset first voltage sensor, and detecting the threshold of the output voltage by a preset second voltage sensor; Determining whether each of the single-mode voltage values ​​exceeds a set first voltage value; If yes, reducing the single-mode voltage value according to a preset frequency and amplitude by using the first control voltage until any of the single-mode voltage values ​​is lower than the first voltage value; If not, the set first control voltage is increased according to the frequency and the amplitude until the output voltage reaches the set voltage.

6. The control method of the AEM water electrolysis hydrogen production system according to claim 5, characterized in that: If not, then increasing the set first control voltage according to the frequency and the amplitude until the output voltage reaches the set voltage, the method further includes: Detecting the output current value of the reaction power supply through a preset current sensor and obtaining it; Adjusting the output voltage until the output current value is within a set constant current value range; Determining whether the output current value reaches a set constant current value; If it is lower than 95% of the constant current value, a warning is issued through a preset display module; If it is lower than 80% of the constant current value, an alarm will be triggered and the machine will be shut down.

7. The control method of the AEM water electrolysis hydrogen production system according to claim 2, characterized in that: The step of balancing the temperature of the electrolyte by a preset electrolyte heat balance module also includes: The electrolyte temperature is detected and acquired through a preset temperature sensor; Determining whether the electrolyte temperature is higher than a set temperature value; If so, a preset heat exchanger and a preset cooling fan are turned on, wherein the heat exchanger cools the electrolyte until the temperature reaches the temperature value, and the cooling fan discharges the heat.

8. The control method of the AEM water electrolysis hydrogen production system according to claim 2, characterized in that: The step of purging the mixed gas and the residual hydrogen through a preset purge module also includes: Mixed gas detection: Detect the mixed gas pressure value through the preset pressure sensor and obtain it; Mixed gas pressure judgment: judging whether the mixed gas pressure value is greater than a set first pressure value; Mixed gas purging: If yes, then open the preset purge solenoid valve, and the purge solenoid valve discharges the mixed gas from the preset purge pipeline within the set first time; If not, repeat the steps of mixed gas detection and mixed gas pressure judgment until the mixed gas pressure value is greater than the first pressure value; wherein, when the mixed gas pressure is still less than the set first pressure value after exceeding the set second time, an error alarm is issued through the preset display module.

9. The control method of the AEM water electrolysis hydrogen production system according to claim 8, characterized in that: The mixed gas purging: if yes, then opening a preset purge solenoid valve, the purge solenoid valve discharges the mixed gas from a preset purge pipe within a set first time, after which the step includes: Determining whether the number of times the mixed gas is purged is less than a set first number; If yes, repeating the steps of mixed gas detection, mixed gas pressure determination and mixed gas purging until the first number of times is reached; If not, the purge solenoid valve is closed, and the hydrogen generated by the electrolyzer is delivered through a preset gas delivery valve.

10. The control method of the AEM water electrolysis hydrogen production system according to claim 9, characterized in that: If not, then closing the purge solenoid valve and delivering the hydrogen generated by the electrolyzer through a preset gas delivery valve comprises: Receiving a preset shutdown command; Hydrogen detection: detecting the hydrogen pressure value through the pressure sensor and obtaining it; Hydrogen pressure judgment: judging whether the hydrogen pressure value is greater than a set second pressure value; If not, shut down; Hydrogen purge: if yes, open the purge solenoid valve, wherein the purge solenoid valve discharges the residual hydrogen from the purge pipeline within a set third time; Repeat the steps of hydrogen detection, hydrogen pressure determination and hydrogen purging until the hydrogen pressure value is less than the second pressure value; wherein, when the hydrogen pressure value is still greater than the second pressure value after being repeated for more than a set second number of times, an error alarm is issued through the display module.

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