Megawatt anion exchange membrane water electrolysis hydrogen production integrated system

Abstract

The utility model relates to a megawatt anion exchange membrane water electrolysis hydrogen production integrated system which comprises an electrolytic bath subsystem comprising a plurality of large standard AEM electrolytic baths and is used for water electrolysis hydrogen production. The electrolyte circulation subsystem is used for providing electrolyte and maintaining circulation; the oxygen treatment subsystem is used for drying and dehydrogenating oxygen; the drying and purifying subsystem is used for drying, deoxidizing and purifying the hydrogen; the purging subsystem is used for purging the residual gas; the power supply and distribution subsystem is used for supplying power; the heat dissipation subsystem is used for cooling and heat dissipation; and the centralized control subsystem is used for controlling the whole integrated system. According to the utility model, the centralized control subsystem is adopted to realize remote control and real-time monitoring on the whole integrated system, so that the whole integrated system is in an optimal operation state, and the efficiency and the dynamic response rate are effectively improved; according to the utility model, the purging system is adopted to purge residual gas, so that the safety of the system is improved; and the low-concentration alkaline liquid is adopted, and hydrogen is removed from oxygen, so that the environmental protection property is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of water electrolysis hydrogen production technology, and more specifically, to a megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system. Background Technology

[0002] To achieve carbon emission reduction targets, vigorously developing hydrogen energy has become a global consensus. The application of hydrogen energy in energy storage, power generation, transportation, metallurgy and chemical industries is gradually expanding. However, the development of water electrolysis hydrogen production systems is crucial for realizing the large-scale application of hydrogen energy.

[0003] Currently, there are three main types of mainstream water electrolysis hydrogen production systems: alkaline water electrolysis (AWE), proton exchange membrane water electrolysis (PEM), and high-temperature solid oxide water electrolysis (SOEC). However, the AEM electrolysis hydrogen production scheme integrates the advantages of PEM, such as high efficiency and fast dynamic response, while avoiding the disadvantages of PEM, such as high hydrogen production cost. On the other hand, AWE and SOEC have disadvantages such as low start-up efficiency, environmental unfriendliness, and high maintenance costs. Utility Model Content

[0004] The technical problems to be solved by this utility model are low efficiency, high maintenance cost, slow dynamic response and environmental unfriendliness. In view of the above-mentioned defects of the prior art, a megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system is provided.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system is constructed, which includes an electrolyzer subsystem, an electrolyte circulation subsystem, a heat dissipation subsystem, an oxygen treatment subsystem, a hydrogen drying and purification subsystem, a purging subsystem, a power supply and distribution electronic system, and a centralized control subsystem.

[0007] The electrolyzer subsystem includes multiple AEM electrolyzers, wherein the AEM electrolyzers are large standard AEM electrolyzers, and any one of the AEM electrolyzers is used for water electrolysis to produce hydrogen;

[0008] The electrolyte circulation subsystem is connected to the electrolytic cell subsystem and is used to provide electrolyte to the electrolytic cell subsystem and maintain electrolyte circulation;

[0009] The heat dissipation subsystem is used to cool and dissipate heat from the integrated system.

[0010] The oxygen treatment subsystem is used to dry and dehydrogenate the oxygen produced by the electrolyzer subsystem;

[0011] The hydrogen drying and purification subsystem is connected to the electrolytic cell subsystem and is used to dry, deoxygenate and purify the hydrogen produced by the electrolytic cell subsystem.

[0012] The purging subsystem is used to purge the residual gas in the integrated system;

[0013] The power supply and distribution electronic system is used to supply power to the integrated system;

[0014] The centralized control subsystem is used to control the electrolytic cell subsystem, the electrolyte circulation subsystem, the oxygen treatment subsystem, the hydrogen drying and purification subsystem, the purging subsystem, the power supply and distribution electronic system, and the heat dissipation subsystem.

[0015] Furthermore, the electrolyte circulation subsystem includes a pure water tank, an alkaline water tank, and a circulating water tank. The circulating water tank is equipped with a level gauge, a heating rod, a conductivity sensor, and a first temperature sensor. The level gauge is used to detect the liquid level in the circulating water tank in real time. The centralized control subsystem controls the pure water tank to supply pure water to the circulating water tank based on the liquid level. The alkaline water tank stores alkaline liquid, which mixes with the pure water to form an electrolyte. The heating rod is used to heat the electrolyte. The first temperature sensor is used to detect the temperature of the electrolyte in real time, and the conductivity sensor is used to detect the conductivity of the electrolyte in real time. The centralized control subsystem controls the alkaline water tank to supply alkaline liquid to the circulating water tank based on the conductivity, and controls the heating rod to heat the electrolyte based on the temperature until both the temperature and conductivity of the electrolyte reach a preset range.

[0016] Furthermore, the electrolyte circulation subsystem also includes a main inlet pipe, multiple branch inlet pipes, multiple outlet pipes, and multiple hydrogen outlet pipes. Each AEM electrolyzer has an inlet, an outlet, and a gas outlet. One end of each branch inlet pipe is connected to the main inlet pipe, and the other end is connected to the inlet. The electrolyte enters the AEM electrolyzer sequentially through the main inlet pipe and the branch inlet pipes. Each branch inlet pipe is equipped with a water pump and a flow meter. The water pump is used to pressurize and transport the electrolyte, and the flow meter is used to detect the electrolyte flow rate in real time. The centralized control subsystem controls the water pump based on the flow rate until the flow rate reaches a preset range.

[0017] Furthermore, the heat dissipation subsystem includes a cooling water unit, cooling water pipes, and multiple heat exchangers. Each heat exchanger includes a heat absorption end and a heat dissipation end. Each heat absorption end is connected to the liquid outlet and the liquid outlet pipe, and is used to absorb the heat of the electrolyte. The cooling water unit is connected to the cooling water pipes, and each heat dissipation end is connected to the cooling water pipes. The cooling water generated by the cooling water unit flows through the cooling water pipes to the heat dissipation end and dissipates the heat.

[0018] Furthermore, one end of any of the outlet pipes is connected to the heat absorption end, and the other end is connected to the circulating water tank. The electrolyte flows sequentially through the heat exchanger and the outlet pipe before returning to the circulating water pump. The outlet pipe is equipped with a second temperature sensor, and the outlet is equipped with a third temperature sensor. Both the second and third temperature sensors are used to detect the temperature of the electrolyte in real time. The centralized control subsystem controls the heat exchanger based on the measurement value of the third temperature sensor until the measurement value of the second temperature sensor reaches a preset range.

[0019] Furthermore, the oxygen treatment subsystem is connected to the circulating water tank. The oxygen treatment subsystem includes an oxygen-water separator, a dehydrogenation tower, and an oxygen-hydrogen sensor. The oxygen generated by the AEM electrolyzer is circulated back to the circulating water tank along with the electrolyte and then sequentially enters the oxygen-water separator and the dehydrogenation tower. The oxygen-water separator is used to dry the oxygen, the oxygen-hydrogen sensor is used to monitor the hydrogen content of the oxygen in real time, and the dehydrogenation tower is used to remove hydrogen from the oxygen until the hydrogen content of the oxygen reaches a preset emission standard.

[0020] Furthermore, the outlet of any of the AEM electrolyzers is connected to the hydrogen drying and purification subsystem via a hydrogen outlet pipe. The hydrogen drying and purification subsystem adopts a three-tower process, including three dryers. Each dryer contains an adsorbent. In any cycle, each dryer sequentially experiences a main working state, a secondary working state, and a regeneration state. In the main working state, the adsorbent dries, deoxygenates, and purifies the hydrogen, bringing the dew point of the hydrogen to below -70°C. In the secondary working state, the adsorbent approaches adsorption saturation. In the regeneration state, the adsorbent regains its adsorption capacity.

[0021] Furthermore, the purging subsystem includes a nitrogen purger, a main purging pipeline, and multiple branch purging pipelines. The nitrogen purger is connected to the main purging pipeline and is used to supply nitrogen. One end of each branch purging pipeline is connected to the main purging pipeline, and the other end is connected to the circulating water tank or the AEM electrolysis cell, respectively, and is used to purge residual gas.

[0022] Furthermore, the centralized control subsystem controls the power supply and distribution electronic system to process the AC mains power, so that the AC mains power is converted into different demand power, and the demand power supplies the integrated system accordingly.

[0023] The beneficial effects of this utility model are as follows:

[0024] This invention proposes to use a centralized control subsystem to stably and accurately control the operating status of large-scale AEM electrolytic cells, which is beneficial to improving the efficiency of the integrated system.

[0025] This invention proposes to use the centralized control subsystem to achieve remote automated control and real-time monitoring of the entire integrated system, so that each subsystem can operate stably according to logic, which helps to reduce cold start time and thus increase dynamic response rate.

[0026] This invention proposes to use a purging system to purge residual gas in the integrated system, effectively avoiding safety hazards and improving the safety of system operation.

[0027] This invention proposes to use an oxygen treatment subsystem to remove hydrogen from oxygen, so that the hydrogen content in the oxygen meets the national emission standards, making it more environmentally friendly.

[0028] This invention only requires an environmentally friendly, low-concentration alkaline liquid to meet the needs of hydrogen production through electrolysis, making it more environmentally friendly.

[0029] The integrated system of this invention can select different numbers of large square AEM electrolytic cells according to power requirements. The design of each subsystem is adapted to the change in the number of large square AEM electrolytic cells, so that the power of the integrated system is not limited. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a PID diagram of a megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system according to one embodiment of this utility model;

[0032] Figure 2 This is a layout diagram of a megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system installed inside a container, according to one embodiment of this utility model.

[0033] Figure 3 This is an overall architecture diagram of a megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system according to one embodiment of this utility model.

[0034] Labeling Explanation: 10. Electrolyte Subsystem; 20. Electrolyte Circulation Subsystem; 30. Oxygen Treatment Subsystem; 40. Hydrogen Drying and Purification Subsystem; 50. Purge Subsystem; 60. Power Supply and Distribution Electronic System; 70. Heat Dissipation Subsystem; 80. Central Control Subsystem. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0036] Please refer to the attached document. Figures 1-3 This invention proposes a megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system, comprising an electrolyzer subsystem 10, an electrolyte circulation subsystem 20, an oxygen treatment subsystem 30, a hydrogen drying and purification subsystem 40, a purging subsystem 50, a power supply and distribution electronic system 60, a heat dissipation subsystem 70, and a centralized control subsystem 80. The electrolyzer subsystem 10 includes multiple cubic meter-level AEM electrolyzers, also known as large standard cubic meter AEM electrolyzers, any one of which is used for water electrolysis to produce hydrogen. The electrolyte circulation subsystem 20 is connected to the electrolyzer subsystem 10 and is used to supply electrolyte to the electrolyzer subsystem 10 and maintain electrolyte circulation. The oxygen treatment subsystem 30 is connected to the electrolyte circulation subsystem 20; oxygen produced by the electrolyzer subsystem 10 flows through the electrolyte circulation subsystem 20 and then enters the oxygen treatment subsystem 30. The oxygen treatment subsystem 30 is used to dry oxygen and remove hydrogen; the hydrogen drying and purification subsystem 40 is connected to the electrolyzer subsystem 10 and is used to dry and purify the hydrogen produced by the electrolyzer subsystem 10; the purging subsystem 50 is used to purge the electrolyzer subsystem 10, the electrolyte circulation subsystem 20, the oxygen treatment subsystem 30, and the hydrogen drying and purification subsystem 40; the power supply and distribution electronic system 60 is used to supply power to the integrated system; the heat dissipation subsystem 70 is used to cool the electrolyte circulation subsystem 20, the hydrogen drying and purification subsystem 40, and the power supply and distribution electronic system 60; and the centralized control subsystem 80 is used to control the electrolyzer subsystem 10, the electrolyte circulation subsystem 20, the oxygen treatment subsystem 30, the hydrogen drying and purification subsystem 40, the purging subsystem 50, the power supply and distribution electronic system 60, and the heat dissipation subsystem 70.

[0037] In this embodiment, a megawatt-scale anion exchange membrane (AEM) water electrolysis hydrogen production integrated system typically consists of independent hydrogen chambers and an electrical chamber. The electrolyzer subsystem 10, electrolyte circulation subsystem 20, oxygen treatment subsystem 30, hydrogen drying and purification subsystem 40, purging subsystem 50, heat dissipation subsystem 70, and centralized control subsystem 80 are located within the hydrogen chamber. The power supply and distribution electronic system 60 is independently installed within the electrical chamber to prevent hydrogen leakage into the electrical chamber and potential safety accidents. The electrolyzer subsystem 10 includes multiple large standard cubic meter (BPM) AEM electrolyzers, where BPM represents the hourly hydrogen production capacity of the electrolyzer under standard conditions (0°C, 1 atmosphere), i.e., Nm³. 3 / h (standard cubic meters per hour), hydrogen production of a large-scale AEM electrolyzer under specified conditions is ≥50 Nm³. 3An electrolyzer with a capacity of 250 kW / h is suitable for large-scale green hydrogen production. In one specific embodiment, the large-scale AEM electrolyzer has a power of 64 Nm³ / h and a hydrogen production rate of 64 Nm³ / h at rated power. 3 / h, hydrogen production rate under overload power is 100 Nm 3 The electrolyzer subsystem 10 includes at least four large standard cubic meter AEM electrolyzers, achieving an integrated system for AEM water electrolysis hydrogen production at the megawatt level. Multiple large standard cubic meter AEM electrolyzers are connected in parallel and used for water electrolysis hydrogen production. The electrolyte circulation subsystem 20 is connected to the electrolyzer subsystem 10. The electrolyte circulation subsystem 20 includes a supply module and a circulation module. The supply module mixes pure water and alkaline liquid in a circulating water tank to form the electrolyte. The circulation module transports the electrolyte from the circulating water tank to the large standard cubic meter AEM electrolyzers for use and then returns it to the circulating water tank. Since the large standard cubic meter AEM electrolyzers generate heat during water electrolysis hydrogen production, causing the electrolyte temperature to rise, excessively high electrolyte temperatures can damage the anion exchange membrane and reduce hydrogen production efficiency. The heat dissipation subsystem 70 cools the electrolyte to maintain its temperature within an ideal range.

[0038] The oxygen treatment subsystem 30 is connected to the circulating water tank. Oxygen generated by the electrolytic cell subsystem 10 flows through the electrolyte circulation subsystem 20 and then enters the oxygen treatment subsystem 30. The oxygen treatment subsystem 30 is used to dry and remove hydrogen from the oxygen to ensure that the hydrogen content meets national emission standards, effectively preventing air pollution. The hydrogen drying and purification subsystem 40 is connected to the electrolytic cell subsystem 10 and is used to dry and purify the hydrogen generated by the electrolytic cell subsystem 10. The dew point of the dried and purified hydrogen reaches below -70℃. The hydrogen drying and purification subsystem 40 adopts a three-tower process, ensuring continuous operation and regenerability, which improves efficiency and utilization. The purging subsystem 50 is used to purge the entire system... The system is purged to remove residual oxygen, hydrogen, and impurities from the integrated system, effectively avoiding safety hazards. The power supply and distribution electronic system 60 supplies power to the integrated system. It employs robust and precise control strategies such as constant voltage ramping, gradual voltage increase, and constant current control to control the operation of the large-capacity AEM electrolyzer, which helps improve hydrogen production efficiency. The efficiency of the large-capacity AEM electrolyzer is as high as 90%. The centralized control subsystem 80 enables remote automated control and real-time monitoring of the entire integrated system, ensuring that each subsystem operates stably according to logic. This helps reduce cold start time and thus increases the dynamic response rate. The cold start time refers to the time required for the system to start normal operation from a completely shut-down state (power outage or no input energy).

[0039] Please refer to Figures 1-3The electrolyte circulation subsystem 20 includes a supply module and a circulation module. The supply module includes a pure water tank, an alkaline water tank, and a circulating water tank. The circulating water tank is equipped with a level gauge, a heating rod, a conductivity sensor, and a first temperature sensor. The level gauge is used to detect the liquid level in the circulating water tank in real time. The centralized control subsystem 80 controls the pure water tank to supply pure water to the circulating water tank based on the liquid level. The alkaline water tank stores alkaline liquid, which mixes with pure water to form an electrolyte. The heating rod is used to heat the electrolyte. The first temperature sensor is used to detect the temperature of the electrolyte in real time, and the conductivity sensor is used to detect the conductivity of the electrolyte in real time. The centralized control subsystem 80 controls the alkaline water tank to supply alkaline liquid to the circulating water tank based on the conductivity, and controls the heating rod to heat the electrolyte based on the temperature until the temperature and conductivity of the electrolyte reach the ideal range.

[0040] In practical implementation: the circulating water tank stores pure water, which is obtained by purifying tap water using a pure water machine. The pure water machine is installed in the electrical compartment and is physically isolated from the power supply and distribution electronic system. The circulating water tanks are connected by pipes containing a water pump and a pneumatic ball valve. The water pump is a device that converts mechanical energy into fluid kinetic or potential energy for transporting, pressurizing, or circulating liquids. The pneumatic ball valve is a valve driven by a pneumatic actuator, characterized by its simple structure, high reliability, and rapid control response. The circulating water tank is equipped with a level gauge, an upper level switch, and a lower level switch. The system employs a capacitive level gauge, an instrument that measures liquid level based on the principle of capacitance change. It is used to monitor the liquid level in the circulating water tank in real time. When the liquid level in the tank is lower than the set height, the lower level switch opens the pneumatic ball valve, allowing water to be added to the tank through the pure water unit. When the liquid level reaches the set height, the upper level switch closes the pneumatic ball valve, stopping the water addition. The alkaline water tank stores alkaline liquid. In one specific embodiment, the alkaline liquid is 10% KOH (potassium hydroxide), which is manually prepared and added to the alkaline water tank, providing an environmentally friendly, low-concentration alkaline solution. Meeting demand, easily recyclable, and suitable for large-scale production of various sizes, it is more environmentally friendly. The alkaline water tank is connected to the circulating water tank via pipelines. Alkaline liquid and pure water are mixed to form the electrolyte. A water pump, pneumatic ball valve, and filter are sequentially installed in the pipelines. The filter is used to remove large particulate impurities. The circulating water tank is equipped with a level gauge, heating rod, conductivity sensor, and a first temperature sensor. The first temperature sensor is used to monitor the temperature of the electrolyte in the circulating water tank in real time, and the heating rod is used to heat the electrolyte. In one specific embodiment, when the electrolyte temperature is in the range of 60℃-70℃, the efficiency of AEM water electrolysis for hydrogen production is [not specified]. When the electrolyte temperature is below 60℃-70℃, the heating rod is activated for heating. The conductivity sensor is used to detect the conductivity (EC, Electrical Conductivity) of the electrolyte in real time. The centralized control subsystem 80 controls the alkaline water tank to provide alkaline liquid to the circulating water tank based on the conductivity. In a specific embodiment, when the electrolyte temperature is 60℃ and EC≤50mS / cm (Simons per centimeter), the pneumatic ball valve is opened to add alkaline liquid to the circulating water tank. When EC>70mS / cm (Simons per centimeter), the pneumatic ball valve is closed to stop adding alkaline liquid.

[0041] Please refer to Figures 1-3The circulation module includes a main inlet pipe, multiple branch inlet pipes, and multiple outlet pipes. Each large-format AEM electrolytic cell has an inlet, an outlet, and a vent, and each inlet is equipped with a pneumatic ball valve. One end of each branch inlet pipe is connected to the main inlet pipe, and the other end is connected to the inlet via a pneumatic ball valve. The electrolyte enters the large-format AEM electrolytic cell sequentially through the main inlet pipe and the branch inlet pipes. The branch inlet pipes are equipped with a water pump and a flow meter. The water pump pressurizes the electrolyte, and the flow meter monitors the electrolyte flow rate in real time. The centralized control subsystem 80 controls the water pump based on the flow rate until the flow rate reaches the ideal range.

[0042] In practical implementation: the main inlet pipe is connected to the circulating water tank. The main inlet pipe contains a filter and a pneumatic ball valve, which is located before all inlet branch pipes to control them. Each large-format AEM electrolytic cell has an inlet, an outlet, and a gas outlet, and each outlet is equipped with a pneumatic ball valve. Controlling these valves controls the inflow and outflow of gas and liquid within the large-format AEM electrolytic cell. Each inlet branch pipe is connected at one end to the main inlet pipe and at the other end to the inlet. A pneumatic ball valve allows the electrolyte in the circulating water tank to flow sequentially through the main inlet pipe and the branch inlet pipes before entering the large-scale AEM electrolytic cell. The branch inlet pipes are equipped with a water pump and a flow meter. The flow meter is used to monitor the electrolyte flow rate in real time. The centralized control subsystem 80 controls the water pump based on the flow rate until the flow rate reaches the ideal range. In one specific embodiment, the ideal electrolyte flow rate is 600 ml / min. When the flow rate detected by the flow meter is less than this value, the centralized control subsystem 80 controls the water pump to increase the electrolyte transport capacity.

[0043] Please refer to Figures 1-3 The heat dissipation subsystem 70 includes a cooling water unit, cooling water pipes, and multiple heat exchangers. Each heat exchanger includes a heat absorption end and a heat dissipation end. Each heat absorption end is connected to the liquid outlet and the liquid outlet pipe, and is used to absorb the heat of the electrolyte. The cooling water unit is connected to the cooling water pipes, and each heat dissipation end is connected to the cooling water pipes. The cooling water generated by the cooling water unit flows through the cooling water pipes to the heat dissipation end and dissipates the heat.

[0044] In specific implementation: the heat dissipation subsystem 70 includes a cooling water unit, cooling water pipes and multiple heat exchangers. Each heat exchanger includes a heat absorption end and a heat dissipation end. Each heat absorption end and heat dissipation end includes an inlet and an outlet. The inlet of the heat absorption end is connected to a pneumatic ball valve at the liquid outlet, and the outlet of the heat absorption end is connected to the liquid outlet pipe. The large-scale AEM electrolyzer produces a large amount of heat through water electrolysis to produce hydrogen, which raises the temperature of the electrolyte. If the electrolyte temperature is too high, it will reduce the hydrogen production efficiency and damage the anion exchange membrane. The electrolyte flows through the heat absorption end of the heat exchanger, and the heat absorption end absorbs the heat of the electrolyte. The cooling water unit provides cooling water. The cooling water pipeline is also equipped with a capacitive level gauge and two pneumatic ball valves. The pneumatic ball valves are installed at the inlet and outlet of the cooling water pipeline, respectively, and are used to control the flow and closure of the cooling water pipeline. The inlet and outlet of any heat dissipation end are connected to the cooling water pipeline, and the inlet of the heat dissipation end is in front of the outlet. The cooling water flows into the heat dissipation end and carries away the heat absorbed by the heat absorption end, and achieves liquid cooling of the electrolyte through the heat exchanger. The inlet and outlet of the heat dissipation end are both equipped with pneumatic ball valves, which are used to control the flow of cooling water into and out of the heat exchanger.

[0045] More specifically, the cooling water of the cooling water unit is used not only for cooling the electrolyte circulation subsystem 20, but also for cooling the hydrogen drying and purification subsystem 40 and the power distribution electronic system 60.

[0046] Please refer to the image. Figures 1-3 One end of any outlet pipe is connected to the heat absorption end, and the other end is connected to the circulating water tank. The electrolyte flows through the heat exchanger and the outlet pipe in sequence and then returns to the circulating water pump. The outlet pipe is equipped with a second temperature sensor, and the outlet is equipped with a third temperature sensor. Both the second and third temperature sensors are used to detect the temperature of the electrolyte in real time. The centralized control subsystem 80 controls the heat exchanger according to the measurement value of the third temperature sensor until the measurement value of the second temperature sensor reaches the ideal range.

[0047] In specific implementation: one end of any outlet pipe is connected to the outlet of the heat exchanger's absorber end, and the other end is connected to the circulating water tank. After the electrolyte is cooled by the heat exchanger, it returns to the circulating water pump through the outlet pipe. Each outlet pipe is equipped with a second temperature sensor, which measures the temperature of the electrolyte after cooling. The outlet of any large standard AEM electrolytic cell is equipped with a third temperature sensor, which measures the temperature of the electrolyte before cooling. The centralized control subsystem 80 controls the cooling efficiency of the heat exchanger based on the measurement value of the third temperature sensor until the measurement value of the second temperature sensor reaches the ideal range. In a specific embodiment, the optimal range for the second temperature sensor to measure the temperature of the electrolyte after cooling is 60℃-70℃. When the temperature value measured by the third temperature sensor differs too much from the optimal temperature range, the controller controls the rate at which cooling water flows into the heat exchanger to improve the heat dissipation effect of the heat exchanger.

[0048] Please refer to Figures 1-3The oxygen treatment subsystem 30 is connected to the circulating water tank. The oxygen treatment subsystem 30 includes an oxygen-water separator, a dehydrogenation tower, and an oxygen-hydrogen sensor. The oxygen generated by the large-scale AEM electrolyzer is circulated back to the circulating water tank with the electrolyte and then enters the oxygen-water separator and the dehydrogenation tower in sequence. The oxygen-water separator is used to dry the oxygen, the oxygen-hydrogen sensor is used to monitor the hydrogen content of the oxygen in real time, and the dehydrogenation tower is used to remove hydrogen from the oxygen until the hydrogen content of the oxygen meets the national emission standards.

[0049] In practical implementation: The circulating water tank is equipped with a pressure switch. The oxygen treatment subsystem 30 is connected to the circulating water tank through the pressure switch. The oxygen generated by the large-scale AEM electrolysis cell circulates back to the circulating water tank with the electrolyte. When the pressure switch detects that the pressure value in the circulating water tank reaches the set position, the switch is opened, and the oxygen enters the oxygen treatment subsystem 30. The oxygen flows sequentially through the oxygen-water separator and the dehydrogenation tower of the oxygen treatment subsystem 30. Both the oxygen-water separator and the dehydrogenation tower are equipped with oxygen hydrogen sensors and waste liquid outlets. The oxygen hydrogen sensors are used to monitor the hydrogen content of the oxygen in real time. The oxygen contains some water, hydrogen, and other impurities. The oxygen-water separator is used to remove water and some impurities from the oxygen, and the dehydrogenation tower is used to remove hydrogen from the oxygen. After the hydrogen content of the dehydrogenated oxygen meets the national emission standards, it can be directly discharged. The generated waste liquid is discharged through the waste liquid outlet for scientific treatment to achieve minimal pollution.

[0050] Please refer to Figures 1-3 The outlet of any large standard AEM electrolyzer is connected to the hydrogen drying and purification subsystem 40 via a hydrogen outlet pipeline. The hydrogen drying and purification subsystem 40 adopts a three-tower process, including three dryers. Each dryer contains an adsorbent. In any cycle, each dryer sequentially goes through a main working state, a secondary working state, and a regeneration state. In the main working state, the adsorbent dries and purifies the hydrogen, bringing the hydrogen dew point to below -70°C. In the secondary working state, the adsorbent is close to adsorption saturation. In the regeneration state, the adsorbent regains its adsorption capacity.

[0051] In specific implementation: Each large-scale AEM electrolyzer is equipped with a pressure sensor and a pneumatic ball valve at its outlet. The pressure sensor detects the pressure at the hydrogen production end of the large-scale AEM electrolyzer. One end of each hydrogen outlet pipe is connected to the pneumatic ball valve at the outlet, and the other end is connected to the hydrogen drying and purification subsystem 40. A one-way valve is installed inside the outlet pipe, allowing hydrogen to flow from the hydrogen production end of the large-scale AEM electrolyzer to the hydrogen drying and purification subsystem 40. The hydrogen drying and purification subsystem 40 employs a three-tower process, including three dryers. Each dryer contains an adsorbent, which dries and purifies hydrogen through physical adsorption. In one specific embodiment, a molecular sieve is used as the adsorbent. Within any cycle, each dryer sequentially experiences a main working state and a secondary working state. In the main operating state, the adsorbent dries and purifies the hydrogen, resulting in a dew point below -70°C. This purified hydrogen is then stored in specialized containers. The dew point is the temperature at which hydrogen droplets form when the hydrogen is saturated and the air temperature drops. The dew point determines the purity and stability of the hydrogen. In one specific embodiment, hydrogen with a dew point ≤ -70°C is ultra-high purity hydrogen for semiconductor applications, while hydrogen with a dew point ≤ -60°C can be stored and transported in liquid hydrogen form. In the secondary operating state, the adsorbent's adsorption capacity is close to adsorption saturation. In the regeneration state, the adsorbent is heated to release adsorbed impurities and moisture, allowing it to regain its adsorption capacity and be regenerated. This three-tower process achieves continuous hydrogen drying and purification, effectively improving efficiency.

[0052] Please refer to Figures 1-3 The purging subsystem 50 includes a nitrogen purger, a main purging pipeline, and multiple purging branch pipelines. The nitrogen purger is connected to the main purging pipeline and is used to supply nitrogen. The main purging pipeline is equipped with multiple pneumatic ball valves. One end of any purging branch pipeline is connected to the main purging pipeline through a pneumatic ball valve, and the other end is connected to a circulating water tank or a large standard AEM electrolytic cell.

[0053] In practical implementation: the purging subsystem 50 includes a nitrogen purger, a main purging pipeline, and multiple branch purging pipelines. The nitrogen purger provides nitrogen and is connected to the main purging pipeline. A pressure-reducing valve is installed at the inlet of the main purging pipeline, adjusting its opening based on the detected pressure value to prevent excessive pressure within the pipeline and potential hazards. The main purging pipeline is equipped with multiple pneumatic ball valves. One end of each branch purging pipeline is connected to the main purging pipeline via a pneumatic ball valve, and the other end is connected to a circulating water tank or a large-scale AEM electrolysis cell. The centralized control subsystem 80 is divided into... The opening degree of the pneumatic ball valve is controlled to purge the electrolyzer subsystem 10, electrolyte circulation subsystem 20, oxygen treatment subsystem 30, and hydrogen drying and purification subsystem 40. In a specific embodiment, when the entire integrated system is started, all pipelines of the entire integrated system need to be purged to avoid dangerous accidents caused by residual gas in the pipelines. When the large standard AEM electrolyzer is shut down, the oxygen production side of the large standard AEM electrolyzer needs to be purged to remove oxygen, and the hydrogen production side needs to be purged to remove hydrogen, so as to prevent residual hydrogen and oxygen from forming directional voltage that affects the membrane life.

[0054] Please refer to Figures 1-3 The centralized control subsystem 80 controls the power supply and distribution electronic system 60 to process the AC power so that the AC power is converted into different demand power, and the demand power supplies the integrated system accordingly.

[0055] In practical implementation: the power supply and distribution electronic system 60 includes a control cabinet, a distribution cabinet, a transformer, and a rectifier cabinet. The control cabinet is used to implement logic control, the distribution cabinet is used to distribute the main power to each branch, the transformer is used to implement voltage changes, and the PWM rectifier (Pulse Width Modulation Rectifier) ​​is an AC-DC conversion device based on high-frequency switching control. It consists of two independent rectifier cabinets connected in parallel. Each cabinet is connected to the transformer winding through a circuit breaker. The circuit breaker provides overload and overcurrent protection and quickly disconnects the connection with the power grid. It is also equipped with a soft-start circuit to ensure zero impact on the power grid during each start-up, effectively improving the safety of the integrated system. The control cabinet adopts robust control strategies such as constant voltage ramping, gradual voltage increase, and constant current control to accurately regulate the operating status of the large-scale AEM electrolytic cell, effectively ensuring the stable operation of the integrated system. The efficiency of the large-scale AEM electrolytic cell reaches 90%.

[0056] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, apparatus, article, or method. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, apparatus, article, or method that includes that element.

[0057] The above description is only a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural changes made based on the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system, characterized in that, It includes an electrolyzer subsystem, an electrolyte circulation subsystem, a heat dissipation subsystem, an oxygen treatment subsystem, a hydrogen drying and purification subsystem, a purging subsystem, a power supply and distribution electronic system, and a centralized control subsystem; The electrolyzer subsystem includes multiple AEM electrolyzers, wherein the AEM electrolyzers are large-scale AEM electrolyzers, and any one of the AEM electrolyzers is used for water electrolysis to produce hydrogen; The electrolyte circulation subsystem is connected to the electrolytic cell subsystem and is used to provide electrolyte to the electrolytic cell subsystem and maintain electrolyte circulation; The heat dissipation subsystem is used to cool and dissipate heat from the integrated system. The oxygen treatment subsystem is used to dry and dehydrogenate the oxygen produced by the electrolyzer subsystem; The hydrogen drying and purification subsystem is connected to the electrolytic cell subsystem and is used to dry, deoxygenate and purify the hydrogen produced by the electrolytic cell subsystem. The purging subsystem is used to purge the residual gas in the integrated system; The power supply and distribution electronic system is used to supply power to the integrated system; The centralized control subsystem is used to control the electrolytic cell subsystem, the electrolyte circulation subsystem, the oxygen treatment subsystem, the hydrogen drying and purification subsystem, the purging subsystem, the power supply and distribution electronic system, and the heat dissipation subsystem.

2. The megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system according to claim 1, characterized in that, The electrolyte circulation subsystem includes a pure water tank, an alkaline water tank, and a circulating water tank. The circulating water tank is equipped with a level gauge, a heating rod, a conductivity sensor, and a first temperature sensor. The level gauge is used to detect the liquid level in the circulating water tank in real time. The centralized control subsystem controls the pure water tank to supply pure water to the circulating water tank based on the liquid level. The alkaline water tank stores alkaline liquid, which mixes with the pure water to form an electrolyte. The heating rod is used to heat the electrolyte. The first temperature sensor is used to detect the temperature of the electrolyte in real time, and the conductivity sensor is used to detect the conductivity of the electrolyte in real time. The centralized control subsystem controls the alkaline water tank to supply alkaline liquid to the circulating water tank based on the conductivity, and controls the heating rod to heat the electrolyte based on the temperature until both the temperature and conductivity of the electrolyte reach a preset range.

3. The megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system according to claim 2, characterized in that, The electrolyte circulation subsystem further includes a main inlet pipe, multiple branch inlet pipes, multiple outlet pipes, and multiple hydrogen outlet pipes. Each AEM electrolyzer has an inlet, an outlet, and a gas outlet. One end of each branch inlet pipe is connected to the main inlet pipe, and the other end is connected to the inlet. The electrolyte enters the AEM electrolyzer sequentially through the main inlet pipe and the branch inlet pipes. Each branch inlet pipe is equipped with a water pump and a flow meter. The water pump is used to pressurize and transport the electrolyte, and the flow meter is used to detect the electrolyte flow rate in real time. The centralized control subsystem controls the water pump based on the flow rate until the flow rate reaches a preset range.

4. The megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system according to claim 3, characterized in that, The heat dissipation subsystem includes a cooling water unit, cooling water pipes, and multiple heat exchangers. Each heat exchanger includes a heat absorption end and a heat dissipation end. Each heat absorption end is connected to the liquid outlet and the liquid outlet pipe, and is used to absorb the heat of the electrolyte. The cooling water unit is connected to the cooling water pipes, and each heat dissipation end is connected to the cooling water pipes. The cooling water generated by the cooling water unit flows through the cooling water pipes to the heat dissipation end and dissipates the heat.

5. The megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system according to claim 4, characterized in that, One end of any of the outlet pipes is connected to the heat absorption end, and the other end is connected to the circulating water tank. The electrolyte flows sequentially through the heat exchanger and the outlet pipe before returning to the circulating water pump. The outlet pipe is equipped with a second temperature sensor, and the outlet is equipped with a third temperature sensor. Both the second and third temperature sensors are used to detect the temperature of the electrolyte in real time. The centralized control subsystem controls the heat exchanger based on the measurement value of the third temperature sensor until the measurement value of the second temperature sensor reaches a preset range.

6. The megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system according to claim 5, characterized in that, The oxygen treatment subsystem is connected to the circulating water tank. The oxygen treatment subsystem includes an oxygen-water separator, a dehydrogenation tower, and an oxygen-hydrogen sensor. The oxygen generated by the AEM electrolyzer is circulated back to the circulating water tank with the electrolyte and then sequentially enters the oxygen-water separator and the dehydrogenation tower. The oxygen-water separator is used to dry the oxygen. The oxygen-hydrogen sensor is used to monitor the hydrogen content of the oxygen in real time. The dehydrogenation tower is used to remove hydrogen from the oxygen until the hydrogen content of the oxygen reaches a preset emission standard.

7. The megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system according to claim 6, characterized in that, The outlet of any of the AEM electrolyzers is connected to the hydrogen drying and purification subsystem via a hydrogen outlet pipeline. The hydrogen drying and purification subsystem adopts a three-tower process, including three dryers. Each dryer contains an adsorbent. In any cycle, each dryer sequentially experiences a main working state, a secondary working state, and a regeneration state. In the main working state, the adsorbent dries, deoxygenates, and purifies the hydrogen, bringing the dew point of the hydrogen to below -70°C. In the secondary working state, the adsorbent approaches adsorption saturation. In the regeneration state, the adsorbent regains its adsorption capacity.

8. The megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system according to claim 7, characterized in that, The purging subsystem includes a nitrogen purger, a main purging pipeline, and multiple branch purging pipelines. The nitrogen purger is connected to the main purging pipeline and is used to supply nitrogen. One end of each branch purging pipeline is connected to the main purging pipeline, and the other end is connected to the circulating water tank or the AEM electrolysis cell, respectively, and is used to purge residual gas.

9. A megawatt-level anion exchange membrane water electrolysis hydrogen production integrated system according to claim 8, characterized in that, The centralized control subsystem controls the power supply and distribution electronic system to process the AC mains power so that the AC mains power is converted into different demand power, which in turn supplies power to the integrated system.

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