Hydrogen synthesis green ammonia coupling system and method based on external magnetic field regulation
By controlling the electron spin state of the catalyst through external magnetic field modulation technology, the ferromagnetic-paramagnetic phase transition is promoted, which solves the problem of high energy consumption in alkaline water electrolysis for hydrogen production and ammonia synthesis, and realizes low-cost and high-efficiency green ammonia synthesis.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANGHAI UNIV
- Filing Date
- 2024-05-29
- Publication Date
- 2026-07-24
AI Technical Summary
Existing alkaline water electrolysis processes for hydrogen production and ammonia synthesis suffer from high energy consumption, demanding system requirements, and low catalytic efficiency. They are difficult to achieve efficient catalytic reactions under mild conditions, resulting in excessively high energy consumption and costs for water electrolysis and ammonia synthesis.
The external magnetic field control technology is used to regulate the electronic spin state of the catalyst in the water electrolysis hydrogen production and ammonia synthesis system through the magnetic field control system, thereby promoting the ferromagnetic-paramagnetic phase transition and improving the catalyst activity. The system thermal management module enables efficient heat management and reduces energy consumption.
This technology enables improved catalytic reaction efficiency under mild conditions, reduced energy consumption for hydrogen production via water electrolysis and ammonia synthesis, increased system thermal energy utilization, and facilitated low-cost operation of green ammonia synthesis.
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Figure CN118877909B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of green ammonia synthesis technology, and in particular to a coupled system for green ammonia synthesis by electrolysis of water based on external magnetic field control. Background Technology
[0002] Hydrogen energy, as a crucial component of the global energy transition, is receiving increasing attention for its technological development. However, due to its poor safety and difficulties in storage and transportation, the large-scale promotion and application of hydrogen energy still faces significant challenges. Ammonia, as an important chemical raw material for industrial and agricultural fertilizers, is also an ideal carbon-free energy carrier and hydrogen storage medium. Its hydrogen content is as high as 17.6 wt%, and the volumetric hydrogen storage densities of liquid ammonia and liquid hydrogen are approximately 102 kg / m³. 3 and 70kg / m 3 Ammonia has an energy density 1.5 times that of liquid hydrogen. Furthermore, under standard atmospheric pressure, ammonia can be liquefied at only -33°C, easier than natural gas liquefaction, while hydrogen liquefaction requires temperatures as low as -253°C, resulting in a significant difference in energy consumption. Therefore, ammonia is much cheaper to store and transport than hydrogen, directly determining that using ammonia for hydrogen storage and transportation is superior to direct storage and transportation of high-pressure hydrogen. In terms of safety, the flammable and explosive nature of hydrogen necessitates stringent sealed storage conditions, while ammonia has a narrower explosion limit range (16%–25%), a higher boiling point, and a lower probability of explosion. Therefore, given ammonia's advantages of good safety, easy compression and liquefaction, and convenient storage and transportation, developing a green ammonia synthesis process is imperative to meet the long-term, seasonal, and large-scale energy storage needs.
[0003] Currently, the Haber-Bosch process is the main method for ammonia synthesis. Hydrogen and nitrogen are introduced into an ammonia synthesis tower, where a catalytic addition reaction is carried out at temperatures of 400–500°C and pressures of 20–30 MPa to produce ammonia. However, the hydrogen produced still relies heavily on fossil fuels, which is detrimental to low-carbon development. Therefore, using renewable energy sources to electrolyze water for hydrogen production, replacing fossil fuel consumption, is gradually becoming a crucial path for the low-carbon transformation and sustainable development of the chemical industry. Thus, deeply coupling the water electrolysis hydrogen production system with the ammonia synthesis system, maximizing the utilization of the process's thermal energy, and achieving efficient heat management are key to low-cost operation of water electrolysis hydrogen production for green ammonia synthesis.
[0004] Alkaline water electrolysis for hydrogen production is a feasible technology for large-scale application. The catalysts in the electrolyzer are mainly transition metals such as iron, nickel, and cobalt, while the catalysts for ammonia synthesis are iron catalysts with iron oxide as the main component. Both are ferromagnetic transition metal elements. How to regulate the electronic structure of the catalyst, accelerate electron transfer, improve reaction kinetics, and reduce the rate-determining step energy barrier to improve catalyst performance remains a bottleneck problem in the field of catalysis. A breakthrough in this technology will help catalytic reactions to proceed under mild conditions, directly reducing the energy consumption and cost of water electrolysis and ammonia synthesis processes.
[0005] However, both alkaline water electrolysis for hydrogen production and ammonia synthesis face problems such as high energy consumption, demanding system requirements, and low catalytic efficiency. Therefore, it is necessary to provide new technical solutions to address the shortcomings of existing technologies. Summary of the Invention
[0006] To achieve the above objectives, this invention provides a coupled system for electrolytic water production and ammonia synthesis based on external magnetic field control, characterized in that it includes a renewable energy power supply system, an electrolytic water production system, an ammonia synthesis system, a magnetic field control system, and a system thermal management module; wherein:
[0007] The renewable energy power system includes a transformer and a rectifier, which utilize green electricity to connect to a water electrolysis system to produce hydrogen and oxygen. The power generation unit employs one or more of the following: solar energy, wind power, hydropower, bioenergy, geothermal energy, seawater temperature difference, and tidal energy. The water electrolysis hydrogen production system is connected to the renewable energy power system and includes at least an alkaline electrolyzer, an alkaline solution filtration and circulation unit, a gas-liquid separation unit, and a water and alkali replenishment unit. The alkaline electrolyzer is connected to the gas-liquid separation unit for purifying and collecting hydrogen and oxygen. The ammonia synthesis system includes an air separation and scrubbing unit, an ammonia synthesis tower, and an ammonia purification device. The hydrogen inlet of the ammonia synthesis tower is connected to the... The hydrogen production system via water electrolysis is connected to the hydrogen outlet. The magnetic field control system includes a magnet device, a magnetic field controller, and a magnetic field measuring instrument. Both the alkaline electrolyzer and the ammonia synthesis tower are connected to the magnetic field control system. The catalytic reactions in the water electrolysis hydrogen production system and the ammonia synthesis system are regulated by the external magnetic field. The system thermal management module is connected to the hydrogen heat exchanger and oxygen heat exchanger in the water electrolysis hydrogen production system and the ammonia heat exchanger in the ammonia synthesis system, respectively. Through waste heat exchange and cooling water reuse in the water electrolysis hydrogen production system and the ammonia synthesis system, the module controls heat distribution and waste heat management, thus coupling the water electrolysis hydrogen production system and the ammonia synthesis system.
[0008] Furthermore, in the magnetic field control system, the magnet device is connected to the magnetic field controller via a wire to adjust the magnetic field strength and direction, and the magnetic field measuring instrument is connected to the magnetic field controller to measure the magnetic field during system operation.
[0009] Furthermore, both the alkaline electrolyzer in the water electrolysis hydrogen production system and the ammonia synthesis tower in the ammonia synthesis system contain ferromagnetic transition metal catalysts.
[0010] Furthermore, the ferromagnetic transition metal catalyst can promote the ferromagnetic-paramagnetic phase transition of the catalyst by regulating the electron spin state under the action of the magnetic field control system, thereby overcoming the catalytic rate limitation.
[0011] Furthermore, under the control of the external magnetic field, the unit energy consumption of the alkaline electrolyzer is W (kW·h / Nm³). 3 This includes DC power consumption (W). dAC power consumption W a Sum minus magnetic effect saves W m , is represented as:
[0012] W = W d +W a -W m
[0013] in,
[0014] W d = (E×I) / H
[0015] W a = (P1+P2+P3) / H
[0016] In the formula, E is the total voltage of the alkaline electrolyzer (V); I is the total current of the alkaline electrolyzer (A); and H is the hydrogen production capacity of the alkaline electrolyzer (Nm³). 3 / h); P1, P2, and P3 are the power of the alkali circulation pump, the power of the water replenishment pump, and the power of the control circuit (W), respectively. The ammonia synthesis tower operates at a temperature below 400-500℃ and a pressure below 20-30MPa under the control of the external magnetic field.
[0017] Furthermore, the cooling water outlets of the hydrogen heat exchanger and oxygen heat exchanger in the gas-liquid separation unit of the water electrolysis hydrogen production system are connected to the cooling water inlet of the ammonia heat exchanger in the ammonia synthesis tower to assist in cooling the ammonia synthesis; the waste heat at the outlet of the ammonia synthesis tower is connected to the alkaline solution filtration and circulation unit in the water electrolysis hydrogen production system to provide a heat source for preheating the alkaline solution.
[0018] Furthermore, the ammonia synthesis system obtains nitrogen from an air separator and an air scrubber, which is then connected to the hydrogen outlet of the water electrolysis hydrogen production system. The hydrogen and nitrogen are mixed and pressurized by a compressor before entering the ammonia synthesis tower. Inside the tower, the ammonia synthesis reaction takes place under high temperature, high pressure, and magnetic field-assisted conditions. The outlet is connected to an ammonia heat exchanger, and the ammonia is separated by an ammonia separator and connected to an ammonia analyzer to obtain pure ammonia, which is then placed in an ammonia storage tank. The remaining hydrogen and nitrogen are pressurized by the compressor and returned to the ammonia synthesis tower. The ammonia heat exchanger is connected to the cooling water outlet of the water electrolysis hydrogen production system and the alkali circulation pump, respectively, to form a recycling system.
[0019] Furthermore, it also includes pressure control, temperature control, liquid level control, and a gas analyzer; pressure sensors are installed at the hydrogen and oxygen outlets of the water electrolysis hydrogen production system and at the hydrogen and nitrogen inlets of the ammonia synthesis tower; temperature sensors are installed at the hydrogen and oxygen heat exchangers and cooling water inlets and outlets of the water electrolysis hydrogen production system and at the ammonia heat exchanger of the ammonia synthesis tower; a liquid level monitoring device is installed in the hydrogen and oxygen gas-liquid separation unit of the water electrolysis hydrogen production system; and a gas analyzer is installed at the hydrogen and oxygen outlets of the water electrolysis hydrogen production system and at the ammonia outlet of the ammonia synthesis tower.
[0020] Furthermore, it also includes achieving a paramagnetic phase transition of the ferromagnetic transition metal catalyst under the control of an external magnetic field, improving the catalytic activity of water electrolysis and ammonia synthesis, reducing the unit energy consumption of the alkaline electrolyzer and the operating temperature and pressure of the ammonia synthesis tower, and promoting energy conservation and consumption reduction in the water electrolysis hydrogen production and ammonia synthesis system; the cooling water outlet water of the water electrolysis hydrogen production system is reused by the ammonia synthesis tower; the waste heat from the ammonia synthesis tower outlet is recycled for the waste heat of the electrolyte in the alkaline electrolyzer, reducing the consumption of alkaline heat source; and the water electrolysis hydrogen production system and the ammonia synthesis system are coupled through a thermal management module to improve thermal energy utilization.
[0021] This invention also provides a method for synthesizing green ammonia by electrolysis of water based on external magnetic field control. Based on the electrolysis of water hydrogen production and green ammonia synthesis coupled system described above, the electrolysis of water hydrogen production system is connected to an alkaline electrolyzer via a wind power generator, a transformer, and a rectifier. The hydrogen and oxygen generated by the alkaline electrolyzer are separated and purified by their respective purification units. The oxygen passes through an oxygen heat exchanger, an oxygen gas-liquid separator, and an oxygen scrubber, and is connected to an oxygen analyzer to obtain high-purity oxygen, which is then stored in an oxygen storage tank. The hydrogen passes through a hydrogen heat exchanger, a hydrogen gas-liquid separator, and a hydrogen scrubber, and is connected to a hydrogen analyzer to obtain high-purity hydrogen, which is then connected to a hydrogen storage tank via a hydrogen buffer tank. Demineralized water, after passing through a demineralized water tank to obtain pure water, is pumped into the oxygen scrubber and hydrogen scrubber by a water replenishment pump. The alkaline solution obtained from the oxygen gas-liquid separator and the hydrogen gas-liquid separator is mixed with fresh alkaline solution, passed through an alkaline solution filter, and then pumped into the alkaline electrolyzer by an alkaline solution circulation pump. The alkaline electrolyzer is placed in a magnet device, and the magnetic field strength and direction are controlled by a magnetic field controller, which is connected to a magnetic field measuring instrument.
[0022] Hydrogen produced by the water electrolysis hydrogen production system is piped in and mixed with nitrogen obtained from the air separator. The mixture is then pressurized by a compressor and connected to the ammonia synthesis tower to produce ammonia. The outlet of the mixed gas is connected to an ammonia heat exchanger, where it is separated into ammonia, hydrogen, and nitrogen by an ammonia separator. The ammonia is then stored in an ammonia storage tank after passing through an ammonia analyzer. The hydrogen and nitrogen are further pressurized by the compressor and returned to the ammonia synthesis tower for further reaction. The ammonia synthesis tower is placed in a magnetic device, with the magnetic field strength controlled by a magnetic field controller and connected to a magnetic field measuring instrument. The catalyst in the alkaline electrolyzer is a nickel-iron alloy catalyst, while the ammonia synthesis tower uses an iron catalyst. The catalyst is controlled by the magnetic device to promote a ferromagnetic-paramagnetic phase transition, overcoming the catalytic rate limit. The cooling water outlets of the oxygen and hydrogen heat exchangers are connected to the cooling water inlet of the ammonia heat exchanger to assist in cooling the synthesized ammonia. The waste heat from the ammonia synthesis tower outlet is connected to the outlet of the alkaline solution circulation pump in the water electrolysis hydrogen production system, providing a heat source for preheating the alkaline solution and coupling the water electrolysis hydrogen production and ammonia synthesis systems.
[0023] This invention deeply couples water electrolysis for hydrogen production and ammonia synthesis systems, achieving not only efficient heat management between systems but also replacing fossil fuel-derived gray hydrogen with green hydrogen, potentially becoming a core component of renewable energy technologies. The deepening industrial coupling between hydrogen and ammonia energy can mutually promote and synergistically develop common key technologies.
[0024] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of a coupled system for hydrogen production and green ammonia synthesis based on external magnetic field control provided in an embodiment of the present invention;
[0026] Figure 2 This is a schematic diagram of the ferromagnetic-paramagnetic phase transition of the transition metal catalyst under the control of an external magnetic field in an embodiment of the present invention.
[0027] Figure reference numerals: 1-Transformer; 2-Rectifier; 3-Alkaline electrolyzer; 4-Magnetic device; 5-Magnetic field controller; 6-Magnetic field measuring instrument; 7-Alkaline solution filter; 8-Alkaline solution circulating pump; 9-Oxygen heat exchanger; 10-Oxygen gas-liquid separator; 11-Oxygen scrubber; 12-Hydrogen heat exchanger; 13-Hydrogen gas-liquid separator; 14-Hydrogen scrubber; 15-Demineralized water tank; 16-Make-up water pump; 17-Oxygen storage tank; 18-Hydrogen buffer tank; 19-Hydrogen storage tank; 20-Air separator; 21-Air scrubber; 22-Compressor pressurization; 23-Ammonia synthesis tower; 24-Ammonia heat exchanger; 25-Ammonia separator; 26-Ammonia storage tank. Detailed Implementation
[0028] The following description, with reference to the accompanying drawings, illustrates several preferred embodiments of the present invention to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.
[0029] like Figure 1 The system shown is a coupled system for hydrogen production and ammonia synthesis based on water electrolysis and external magnetic field control, comprising a renewable energy power system, a water electrolysis hydrogen production system, an ammonia synthesis system, a magnetic field control system, and a system thermal management module.
[0030] In this embodiment, the water electrolysis hydrogen production system is connected to the alkaline electrolyzer 3 via wind power generation, transformer 1, rectifier 2, and wind turbine 1. The hydrogen and oxygen generated by the alkaline electrolyzer are separated and purified by their respective separation units. The oxygen passes through the oxygen heat exchanger 9, oxygen gas-liquid separator 10, and oxygen scrubber 11, and is connected to the oxygen analyzer to obtain high-purity oxygen, which is stored in the oxygen storage tank 17. The hydrogen passes through the hydrogen heat exchanger 12, hydrogen gas-liquid separator 13, and hydrogen scrubber 14, and is connected to the hydrogen analyzer to obtain high-purity hydrogen, which is then connected to the hydrogen storage tank 19 via the hydrogen buffer tank 18. The demineralized water is purified by the demineralized water tank 15 and then pumped into the oxygen scrubber 11 and hydrogen scrubber 14 by the water replenishment pump 16. The alkaline solution obtained by the oxygen gas-liquid separator 10 and the hydrogen gas-liquid separator 13 is mixed with fresh alkaline solution and passed through the alkaline solution filter 7, and then pumped into the alkaline electrolyzer 3 by the alkaline solution circulation pump. The alkaline electrolyzer 3 is placed in the magnet device 4, and the magnetic field strength and direction are controlled by the magnetic field controller 5, which is connected to the magnetic field measuring instrument.
[0031] Hydrogen produced by the water electrolysis hydrogen production system is piped in and mixed with nitrogen obtained from air separator 20. After being pressurized by compressor 22, it is connected to ammonia synthesis tower 23 to produce ammonia. The outlet of the mixed gas is connected to ammonia heat exchanger 24 and then separated into ammonia, hydrogen, and nitrogen by ammonia separator 25. The ammonia is stored in ammonia storage tank 26 after passing through an ammonia analyzer. The hydrogen and nitrogen are further pressurized by compressor 22 and returned to ammonia synthesis tower 23 for further reaction. Ammonia synthesis tower 23 is placed in iron device 4, and the magnetic field strength is controlled by magnetic field controller 5 and connected to magnetic field measuring instrument.
[0032] Continue reading Figure 1 In this embodiment, the catalyst in the alkaline electrolyzer 3 is a nickel-iron alloy catalyst, and the ammonia synthesis catalyst in the ammonia synthesis tower 23 is an iron catalyst. The catalyst is regulated by the magnet device 4 to promote the ferromagnetic-paramagnetic phase transition of the catalyst, breaking through the catalytic rate limit, and adjusting the operating temperature of the ammonia synthesis tower 23 to 420℃ and the pressure to 18MPa. The cooling water outlets of the oxygen heat exchanger 9 and the hydrogen heat exchanger 12 are connected to the cooling water inlet of the ammonia heat exchanger 24 to assist in cooling the ammonia synthesis. The waste heat at the outlet of the ammonia synthesis tower 23 is connected to the outlet of the alkaline solution circulation pump 8 in the water electrolysis hydrogen production system to provide a heat source for alkaline solution preheating, thus deeply coupling the water electrolysis hydrogen production and ammonia synthesis systems.
[0033] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.
Claims
1. A coupled system for hydrogen production and green ammonia synthesis via water electrolysis based on external magnetic field control, characterized in that, This includes a renewable energy power system, a water electrolysis hydrogen production system, an ammonia synthesis system, a magnetic field control system, and a system thermal management module; among which: The renewable energy power system includes a transformer and a rectifier, which utilize green electricity to connect to a water electrolysis system to produce hydrogen and oxygen. The power generation unit employs one or more of the following: solar energy, wind power, hydropower, bioenergy, geothermal energy, seawater temperature difference, and tidal energy. The water electrolysis hydrogen production system is connected to the renewable energy power system and includes at least an alkaline electrolyzer, an alkaline solution filtration and circulation unit, a gas-liquid separation unit, and a water and alkali replenishment unit. The alkaline electrolyzer is connected to the gas-liquid separation unit for purifying and collecting hydrogen and oxygen. The ammonia synthesis system includes an air separation and scrubbing unit, an ammonia synthesis tower, and an ammonia purification device. The hydrogen inlet of the ammonia synthesis tower is connected to the hydrogen outlet of the water electrolysis hydrogen production system. The magnetic field control system includes a magnet device, a magnetic field controller, and a magnetic field measuring instrument. The alkaline electrolyzer and the ammonia synthesis tower... The towers are all connected to the magnetic field control system, which regulates the catalytic reactions in the water electrolysis hydrogen production system and the ammonia synthesis system through the action of an external magnetic field. The system thermal management module is connected to the hydrogen heat exchanger and oxygen heat exchanger in the water electrolysis hydrogen production system and the ammonia heat exchanger in the ammonia synthesis system, respectively. It controls heat distribution and waste heat management through waste heat exchange and cooling water reuse in the water electrolysis hydrogen production system and the ammonia synthesis system, thus coupling the water electrolysis hydrogen production system and the ammonia synthesis system. The alkaline electrolyzer in the water electrolysis hydrogen production system and the ammonia synthesis tower in the ammonia synthesis system both contain ferromagnetic transition metal catalysts. The ferromagnetic transition metal catalysts are controlled by the magnetic field control system to regulate the electron spin state, promote the ferromagnetic-paramagnetic phase transition of the catalyst, and overcome the catalytic rate limit.
2. The coupled system for hydrogen production and green ammonia synthesis based on external magnetic field control as described in claim 1, wherein, In the magnetic field control system, the magnet device is connected to the magnetic field controller via a wire to adjust the magnetic field strength and direction. The magnetic field measuring instrument is connected to the magnetic field controller to measure the magnetic field during system operation.
3. The coupled system for hydrogen production and green ammonia synthesis based on external magnetic field control as described in claim 1, wherein, The unit energy consumption W (kW·h / Nm³) of the alkaline electrolytic cell under the control of the external magnetic field is... 3 (Including DC power consumption W) d AC power consumption W a Sum minus magnetic effect saves W m , represented as: ； in, ； ； In the formula, E is the total voltage of the alkaline electrolyzer (V); I is the total current of the alkaline electrolyzer (A); and H is the hydrogen production capacity of the alkaline electrolyzer (Nm³). 3 / h); P1, P2, and P3 are the power of the alkali circulation pump, the power of the water replenishment pump, and the power of the control circuit (W), respectively. The ammonia synthesis tower operates at a temperature below 400~500℃ and a pressure below 20~30MPa under the control of the external magnetic field.
4. The coupled system for hydrogen production and green ammonia synthesis based on external magnetic field control as described in claim 1, wherein, The cooling water outlets of the hydrogen heat exchanger and oxygen heat exchanger in the gas-liquid separation unit of the water electrolysis hydrogen production system are connected to the cooling water inlet of the ammonia heat exchanger in the ammonia synthesis tower to assist in cooling the ammonia synthesis; the waste heat at the outlet of the ammonia synthesis tower is connected to the alkali solution filtration and circulation unit in the water electrolysis hydrogen production system to provide a heat source for alkali solution preheating.
5. The coupled system for hydrogen production and green ammonia synthesis based on external magnetic field control as described in claim 1, wherein, The ammonia synthesis system obtains nitrogen from an air separator and an air scrubber, which is then connected to the hydrogen outlet of the water electrolysis hydrogen production system. The hydrogen and nitrogen are mixed and pressurized by a compressor before entering the ammonia synthesis tower. Inside the tower, the ammonia synthesis reaction takes place under high temperature, high pressure, and magnetic field-assisted conditions. The outlet is connected to an ammonia heat exchanger, and the ammonia is separated by an ammonia separator and connected to an ammonia analyzer to obtain pure ammonia, which is placed in an ammonia storage tank. The remaining hydrogen and nitrogen are pressurized by the compressor and returned to the ammonia synthesis tower. The ammonia heat exchanger is connected to the cooling water outlet of the water electrolysis hydrogen production system and the alkali circulation pump, forming a recycling system.
6. The coupled system for hydrogen production and green ammonia synthesis based on external magnetic field control as described in claim 1, wherein, It also includes pressure control, temperature control, liquid level control, and a gas analyzer; pressure sensors are installed at the hydrogen and oxygen outlets of the water electrolysis hydrogen production system and at the hydrogen and nitrogen inlets of the ammonia synthesis tower; temperature sensors are installed at the hydrogen and oxygen heat exchangers and cooling water inlets and outlets of the water electrolysis hydrogen production system and at the ammonia heat exchanger of the ammonia synthesis tower; a liquid level monitoring device is installed in the hydrogen and oxygen gas-liquid separation unit of the water electrolysis hydrogen production system; and a gas analyzer is installed at the hydrogen and oxygen outlets of the water electrolysis hydrogen production system and at the ammonia outlet of the ammonia synthesis tower.
7. The coupled system for hydrogen production and green ammonia synthesis based on external magnetic field control according to any one of claims 1 to 6, wherein, include: Under the control of an external magnetic field, a paramagnetic phase transition of the ferromagnetic transition metal catalyst is achieved, improving the catalytic activity of water electrolysis and ammonia synthesis, reducing the unit energy consumption of the alkaline electrolyzer and the operating temperature and pressure of the ammonia synthesis tower, and promoting energy conservation and consumption reduction in the water electrolysis hydrogen production and ammonia synthesis system; the cooling water outlet water of the water electrolysis hydrogen production system is reused by the ammonia synthesis tower; the waste heat from the ammonia synthesis tower outlet is recycled to the waste heat of the electrolyte in the alkaline electrolyzer, reducing the consumption of alkaline heat source; the coupling of the water electrolysis hydrogen production system and the ammonia synthesis system is achieved through a thermal management module, improving the thermal energy utilization rate.
8. A method for synthesizing green ammonia through water electrolysis based on external magnetic field control, characterized in that, Based on the electrolysis of water to produce hydrogen and synthesize green ammonia coupling system as described in any one of claims 1-6, the electrolysis of water to produce hydrogen system is connected to an alkaline electrolyzer via a wind power generator, a transformer, and a rectifier. The hydrogen and oxygen generated by the alkaline electrolyzer are separated and purified by their respective separation units. The oxygen passes through an oxygen heat exchanger, an oxygen gas-liquid separator, and an oxygen scrubber, and is connected to an oxygen analyzer to obtain high-purity oxygen, which is then stored in an oxygen storage tank. The hydrogen passes through a hydrogen heat exchanger, a hydrogen gas-liquid separator, and a hydrogen scrubber, and is connected to a hydrogen analyzer to obtain high-purity hydrogen, which is then connected to a hydrogen storage tank via a hydrogen buffer tank. The demineralized water is purified by a demineralized water tank and then pumped into the oxygen scrubber and hydrogen scrubber by a water replenishment pump. The alkaline solution obtained from the oxygen gas-liquid separator and the hydrogen gas-liquid separator is mixed with fresh alkaline solution, passed through an alkaline solution filter, and then pumped into the alkaline electrolyzer by an alkaline solution circulation pump. The alkaline electrolyzer is placed in a magnet device, and the magnetic field strength and direction are controlled by a magnetic field controller and connected to a magnetic field measuring instrument. Hydrogen produced by the water electrolysis hydrogen production system is piped in and mixed with nitrogen obtained from the air separator. The mixture is then pressurized by a compressor and connected to the ammonia synthesis tower to produce ammonia. The outlet of the mixed gas is connected to an ammonia heat exchanger, where it is separated into ammonia, hydrogen, and nitrogen by an ammonia separator. The ammonia is then stored in an ammonia storage tank after passing through an ammonia analyzer. The hydrogen and nitrogen are further pressurized by the compressor and returned to the ammonia synthesis tower for further reaction. The ammonia synthesis tower is placed in a magnetic device, with the magnetic field strength controlled by a magnetic field controller and connected to a magnetic field measuring instrument. The catalyst in the alkaline electrolyzer is a nickel-iron alloy catalyst, while the ammonia synthesis tower uses an iron catalyst. The catalyst is controlled by the magnetic device to promote a ferromagnetic-paramagnetic phase transition, overcoming the catalytic rate limit. The cooling water outlets of the oxygen and hydrogen heat exchangers are connected to the cooling water inlet of the ammonia heat exchanger to assist in cooling the synthesized ammonia. The waste heat from the ammonia synthesis tower outlet is connected to the outlet of the alkaline solution circulation pump in the water electrolysis hydrogen production system, providing a heat source for preheating the alkaline solution and coupling the water electrolysis hydrogen production and ammonia synthesis systems.