An apparatus system and method for coupling hydrogen production and ammonia synthesis

Abstract

The present invention provides a device system and method for coupling hydrogen production and ammonia synthesis. The device system includes a nitrogen supply unit, a hydrogen production unit, and an ammonia synthesis unit. The hydrogen production unit and the ammonia synthesis unit are interconnected, and the hydrogen production unit and the ammonia synthesis unit are respectively and independently connected to the nitrogen supply unit. The method includes introducing nitrogen into the hydrogen production process and the ammonia synthesis process respectively. The device system provided by the present invention deeply integrates the hydrogen production device and the ammonia synthesis device, solves the problems of hydrogen-oxygen intermixing and uneven temperature in the electrolytic cell, and improves the safety and stability of the whole system.

Description

Technical Field

[0001] The present invention belongs to the technical field of green chemical engineering, and relates to a device system for coupling hydrogen production and ammonia synthesis, and particularly to a device system and method for coupling hydrogen production and ammonia synthesis. Background Art

[0002] With the proposal of the national "dual carbon" goal, hydrogen energy has attracted much attention due to its advantages such as high calorific value, zero emission, and no pollution. However, the low density and high danger of hydrogen make its storage and transportation difficult. As one of the most basic raw materials in modern chemical and agricultural production, ammonia is relatively easy to store and transport. Therefore, combining the hydrogen production process with the ammonia synthesis process to convert the produced hydrogen into ammonia to solve the problems of hydrogen storage and transportation is a major current trend.

[0003] However, due to its own structural characteristics, the electrolyzer in the hydrogen production system is prone to a large temperature gradient inside, resulting in uneven temperature, and hydrogen-oxygen intermixing is likely to occur, making the purities of hydrogen and oxygen unqualified, affecting the safety and stability of the electrolyzer, and there are safety risks. Especially in variable power scenarios, such as when using renewable energy for power supply, it is particularly significant. Therefore, in the device system for coupling hydrogen production and ammonia synthesis, how to solve the problems of hydrogen-oxygen intermixing and uneven temperature inside the electrolyzer, and improve the safety and stability of the whole system has become an urgent problem to be solved by those skilled in the art at present. Summary of the Invention

[0004] The purpose of the present invention is to provide a device system and method for coupling hydrogen production and ammonia synthesis. The device system deeply integrates the hydrogen production device and the ammonia synthesis device, solves the problems of hydrogen-oxygen intermixing and uneven temperature inside the electrolyzer, and improves the safety and stability of the whole system.

[0005] To achieve the purpose of this invention, the following technical solutions are adopted:

[0006] In the first aspect, the present invention provides a device system for coupling hydrogen production and ammonia synthesis, and the device system includes a nitrogen supply unit, a hydrogen production unit, and an ammonia synthesis unit.

[0007] The hydrogen production unit is connected to the ammonia synthesis unit, and the hydrogen production unit and the ammonia synthesis unit are respectively and independently connected to the nitrogen supply unit.

[0008] The device system provided by the present invention not only realizes the deep integration between the hydrogen production process and the ammonia synthesis process, solves the current problems of hydrogen storage and transportation, but also connects the nitrogen supply unit and the hydrogen production unit to each other on this basis, so that nitrogen is introduced into the interior of the hydrogen production unit, improving the flow rate of the fluid in the hydrogen production unit, and thus reducing the temperature gradient in the hydrogen production unit. In addition, the nitrogen atmosphere reduces the lower limit of hydrogen-oxygen mixing in the hydrogen production unit, improving the safety and stability of the hydrogen production device.

[0009] Preferably, the nitrogen supply unit includes an air separation machine and / or a nitrogen storage tank.

[0010] Optionally, the hydrogen production unit includes an electrolytic cell, and the nitrogen provided by the nitrogen supply unit is directly introduced into the interior of the electrolytic cell.

[0011] Optionally, the hydrogen production unit includes an electrolytic cell and an electrolyte circulation pump, and the nitrogen provided by the nitrogen supply unit is introduced into the bottom of the electrolytic cell through the outlet of the electrolyte circulation pump, and / or directly introduced into the interior of the electrolytic cell.

[0012] In the present invention, the nitrogen is introduced into the bottom of the electrolytic cell through the outlet of the electrolyte circulation pump specifically as follows: the nitrogen and the electrolyte circulate together into the interior of the electrolytic cell, and are introduced from the bottom of the electrolytic cell, thereby increasing the flow rate of the liquid in the electrolytic cell and further improving the temperature gradient in the electrolytic cell.

[0013] In the present invention, the nitrogen is directly introduced into the interior of the electrolytic cell specifically as follows: the nitrogen is directly introduced into the interior of the electrolytic cell from the middle, lower or middle-lower part of the electrolytic cell, without being introduced simultaneously with the electrolyte.

[0014] Preferably, the nitrogen provided by the air separation machine is divided into two paths, one path of nitrogen is introduced into the electrolytic cell, and the other path of nitrogen is introduced into the ammonia synthesis unit to adjust the nitrogen-hydrogen ratio required for the ammonia synthesis reaction.

[0015] Preferably, the air separation machine is also used to recover the nitrogen in the nitrogen-oxygen mixed gas discharged from the electrolytic cell.

[0016] Preferably, the device system further includes a purification unit, and the purification unit is connected between the hydrogen production unit and the ammonia synthesis unit.

[0017] Preferably, the purification unit includes a drying tower.

[0018] Preferably, the nitrogen-hydrogen mixed gas flowing through the purification unit and the reaction product generated by the ammonia synthesis unit are heated and exchanged to form hot regeneration gas to supply heat for desorption of the drying tower.

[0019] Preferably, the nitrogen-hydrogen mixed gas flowing through the purification unit and the cold circulating gas generated by the ammonia synthesis unit are cooled and exchanged to form cold regeneration gas to cool and regenerate the drying tower.

[0020] In the present invention, the cold recycle gas specifically refers to the gas obtained after cooling and gas-liquid separation of the synthesis ammonia reaction product.

[0021] Preferably, the device system further includes a renewable energy power supply sub-unit for supplying the required electric energy to the device system.

[0022] In the present invention, the electric energy source of the renewable energy power supply sub-unit includes any one or a combination of at least two of wind power generation, photovoltaic power generation, or hydroelectric power generation.

[0023] In a second aspect, the present invention provides a method for coupling hydrogen production and ammonia synthesis using the device system as described in the first aspect. The method includes: introducing nitrogen into the hydrogen production section and the ammonia synthesis section respectively.

[0024] The method provided by the present invention deeply integrates the hydrogen production process and the ammonia synthesis process, and on this basis, solves the problem of temperature gradient existing in the hydrogen production device, improves the safety and stability of the hydrogen production device, and is conducive to large-scale popularization and application.

[0025] Preferably, the introduction of nitrogen into the hydrogen production section includes the following two methods:

[0026] (1) Introducing nitrogen into the electrolytic cell in the hydrogen production section in a quantitative manner according to a preset amount.

[0027] (2) Introducing nitrogen into the electrolytic cell in the hydrogen production section in a variable manner according to the hydrogen production power or hydrogen production amount to maintain the stability of the total gas volume.

[0028] In the present invention, the total gas volume specifically refers to the hydrogen production amount under full power conditions. For example, if the theoretical hydrogen production amount under full power conditions is A and the current actual hydrogen production amount is B, then the introduced nitrogen amount is A - B; among them, the current actual hydrogen production amount B can be directly measured or calculated according to the hydrogen production power.

[0029] Optionally, after the nitrogen is introduced into the electrolytic cell in the hydrogen production section, a nitrogen-hydrogen mixed gas is formed, and the nitrogen-hydrogen mixed gas is purified and then introduced into the ammonia synthesis section as the raw material gas for the ammonia synthesis reaction.

[0030] Optionally, after the nitrogen is introduced into the electrolytic cell in the hydrogen production section, a nitrogen-oxygen mixed gas is formed, and the nitrogen-oxygen mixed gas is recycled to produce nitrogen.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The device system provided by the present invention not only realizes the deep integration between the hydrogen production process and the ammonia synthesis process, solves the current problems of hydrogen storage and transportation, but also connects the nitrogen supply unit and the hydrogen production unit to each other on this basis, so that nitrogen is introduced into the interior of the hydrogen production unit, improving the flow rate of the fluid in the hydrogen production unit, and further reducing the temperature gradient in the hydrogen production unit. In addition, the nitrogen atmosphere reduces the lower limit of hydrogen-oxygen mixing in the hydrogen production unit, improving the safety and stability of the hydrogen production device. Description of the Drawings

[0033] Figure 1 is a schematic diagram of the device system for coupling hydrogen production and ammonia synthesis provided by the present invention;

[0034] Figure 2 is a flowchart of the method for coupling hydrogen production and ammonia synthesis provided by the present invention;

[0035] Figure 3 is a schematic diagram of the device system for coupling hydrogen production and ammonia synthesis provided in Example 4.

[0036] Wherein: 1 - power supply; 2 - electrolytic cell; 3 - gas-liquid separator; 4 - drying tower; 5 - ammonia synthesis gas compressor; 6 - ammonia synthesizer; 7 - ammonia gas-liquid separator; 8 - air separator. Detailed Embodiments

[0037] The technical solutions of the present invention will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0038] The present invention provides a device system for coupling hydrogen production and ammonia synthesis, as Figure 1 shown, the device system includes a nitrogen supply unit, a hydrogen production unit and an ammonia synthesis unit; the hydrogen production unit and the ammonia synthesis unit are connected to each other, and the hydrogen production unit and the ammonia synthesis unit are respectively and independently connected to the nitrogen supply unit.

[0039] Specifically, the nitrogen supply unit includes an air separator 8 and / or a nitrogen storage tank (not shown in the figure); the hydrogen production unit includes an electrolytic cell 2, and the nitrogen provided by the nitrogen supply unit directly enters the interior of the electrolytic cell 2 through the middle, lower or middle-lower part of the electrolytic cell 2; or, the hydrogen production unit includes an electrolytic cell 2 and an electrolyte circulation pump (not shown in the figure), and the nitrogen provided by the nitrogen supply unit enters the bottom of the electrolytic cell 2 through the outlet of the electrolyte circulation pump, and / or directly enters the interior of the electrolytic cell 2 through the middle, lower or middle-lower part of the electrolytic cell 2. The nitrogen provided by the air separator 8 is divided into two paths, one path of nitrogen enters the electrolytic cell 2, and the other path of nitrogen enters the ammonia synthesis unit to adjust the nitrogen-hydrogen ratio required for the ammonia synthesis reaction, and the air separator 8 is also used to recover the nitrogen in the nitrogen-oxygen mixed gas discharged from the electrolytic cell 2.

[0040] In addition, the device system further includes a purification unit, and the purification unit is connected between the hydrogen production unit and the ammonia synthesis unit. The purification unit includes a drying tower 4. The nitrogen-hydrogen mixed gas flowing through the purification unit and the reaction product generated by the ammonia synthesis unit are heated and exchanged to form hot regeneration gas to supply heat for desorption of the drying tower 4, and / or the nitrogen-hydrogen mixed gas flowing through the purification unit and the cold circulating gas generated by the ammonia synthesis unit are cooled and exchanged to form cold regeneration gas to cool and regenerate the drying tower 4. The device system further includes a renewable energy power supply sub-unit for supplying the electric energy required by the device system. As Figure 1 shown, the power supply 1 can be a renewable energy power supply sub-unit, and the power source of the renewable energy power supply sub-unit can be wind power generation, photovoltaic power generation or a combination thereof. The present invention does not limit the specific form of the power source of the renewable energy power supply sub-unit.

[0041] Thus, it can be seen that the device system provided by the present invention not only realizes the deep integration between the hydrogen production process and the ammonia synthesis process, solves the current problems of hydrogen storage and transportation, but also connects the nitrogen supply unit and the hydrogen production unit to each other on this basis, so that nitrogen is introduced into the interior of the hydrogen production unit, improving the flow velocity of the fluid in the hydrogen production unit, and further reducing the temperature gradient in the hydrogen production unit. In addition, the nitrogen atmosphere reduces the lower limit of hydrogen-oxygen mixing in the hydrogen production unit, improving the safety and stability of the hydrogen production device.

[0042] Using the above device system for coupling the hydrogen production process and the ammonia synthesis process, as Figure 2 shown, nitrogen is introduced into the hydrogen production link and the ammonia synthesis link respectively.

[0043] Among them, there are the following two ways for introducing nitrogen into the hydrogen production link:

[0044] (1) Nitrogen is introduced into the electrolytic cell in the hydrogen production link in a quantitative manner according to a preset amount. The value of the preset amount can be determined according to actual needs. For example, the ratio of the amount of nitrogen introduced into the hydrogen production link and the ammonia synthesis link is set to 1:1. The present invention does not limit the value of the preset amount;

[0045] (2) Nitrogen is introduced into the electrolytic cell in the hydrogen production link in a variable manner according to the hydrogen production power or the hydrogen production amount to maintain the stability of the total gas volume. It should be noted that introducing nitrogen in a variable manner is more suitable for the scenario of variable-power hydrogen production and ammonia synthesis, such as hydrogen production and ammonia synthesis using renewable energy.

[0046] Further, the nitrogen gas forms a nitrogen-hydrogen mixed gas after being introduced into the electrolytic cell in the hydrogen production section, and the nitrogen-hydrogen mixed gas is purified and then introduced into the ammonia synthesis section as the raw material gas for the ammonia synthesis reaction; and / or, the nitrogen gas forms a nitrogen-oxygen mixed gas after being introduced into the electrolytic cell in the hydrogen production section, and the nitrogen-oxygen mixed gas is recycled to produce nitrogen gas.

[0047] The above method deeply integrates the hydrogen production process and the ammonia synthesis process, and on this basis, solves the problem of temperature gradient in the hydrogen production device, improves the safety and stability of the hydrogen production device, and is conducive to large-scale popularization and application.

[0048] Example 1

[0049] This example provides a device system for coupling hydrogen production and ammonia synthesis, as Figure 1 shown, the device system includes a nitrogen gas supply unit, a hydrogen production unit, a purification unit and an ammonia synthesis unit; the hydrogen production unit, the purification unit and the ammonia synthesis unit are connected in sequence, and the hydrogen production unit and the ammonia synthesis unit are respectively and independently connected to the nitrogen gas supply unit.

[0050] In this example, the nitrogen gas supply unit is an air separator 8; the hydrogen production unit includes an electrolytic cell 2 and an electrolyte circulation pump (not shown in the figure), and the electrolytic cell 2 is connected to the air separator 8. The upstream of the electrolytic cell 2 is also connected to a power source 1, and the downstream is also connected to a gas-liquid separator 3; among them, the power source 1 can be a renewable energy power supply sub-unit, and the power source of the renewable energy power supply sub-unit can be wind power generation, photovoltaic power generation or a combination thereof. This example does not limit the specific form of the power source of the renewable energy power supply sub-unit; the nitrogen gas provided by the air separator 8 is introduced into the bottom of the electrolytic cell 2 through the outlet of the electrolyte circulation pump, and the nitrogen gas provided by the air separator 8 is divided into two paths, one path of nitrogen gas is introduced into the electrolytic cell 2, and the other path of nitrogen gas is introduced into the ammonia synthesis gas compressor 5 to adjust the nitrogen-hydrogen ratio required for the ammonia synthesis reaction. The air separator 8 is also used to recover the nitrogen gas in the nitrogen-oxygen mixed gas discharged from the electrolytic cell 2.

[0051] In this example, the purification unit includes a drying tower 4. The nitrogen-hydrogen mixed gas flowing through the drying tower 4 and the reaction product generated by the ammonia synthesizer 6 are heated and exchanged to form hot regeneration gas to supply heat for desorption of the drying tower 4, and the nitrogen-hydrogen mixed gas flowing through the drying tower 4 and the cold circulating gas generated by the ammonia synthesis unit are cooled and exchanged to form cold regeneration gas to cool and regenerate the drying tower 4. Among them, the cold circulating gas is specifically the gas obtained after the reaction product generated by the ammonia synthesizer 6 is cooled and the gas-liquid separation effect of the ammonia gas-liquid separator 7.

[0052] The device system provided by Example 1 can introduce nitrogen gas into the hydrogen production section and the ammonia synthesis section respectively, and there are the following two ways for the nitrogen gas to be introduced into the hydrogen production section:

[0053] (1) Nitrogen is introduced into the bottom of the electrolytic cell through the outlet of the electrolyte circulation pump in a quantitative manner according to a preset amount.

[0054] (2) Nitrogen is introduced into the bottom of the electrolytic cell through the outlet of the electrolyte circulation pump in a variable manner according to the hydrogen production power or hydrogen production amount to maintain the stability of the total gas volume.

[0055] Wherein, the total gas volume specifically refers to the hydrogen production amount under full power conditions. For example, the theoretical hydrogen production amount under full power conditions is A, and the current actual hydrogen production amount is B, then the introduced nitrogen amount is A - B.

[0056] Example 2

[0057] This example provides a device system for coupling hydrogen production and ammonia synthesis. As Figure 1 shown, the device system includes a nitrogen supply unit, a hydrogen production unit, a purification unit, and an ammonia synthesis unit; the hydrogen production unit, the purification unit, and the ammonia synthesis unit are connected in sequence, and the hydrogen production unit and the ammonia synthesis unit are respectively and independently connected to the nitrogen supply unit.

[0058] In this example, the nitrogen supply unit is an air separator 8; the hydrogen production unit includes an electrolytic cell 2 and an electrolyte circulation pump (not shown in the figure), and the electrolytic cell 2 is connected to the air separator 8. The upstream of the electrolytic cell 2 is also connected to a power supply 1, and the downstream is also connected to a gas-liquid separator 3; wherein, the power supply 1 can be a renewable energy power supply unit, and the power source of the renewable energy power supply unit can be wind power generation, photovoltaic power generation, or a combination thereof. This example does not limit the specific form of the power source of the renewable energy power supply unit; the nitrogen provided by the air separator 8 is directly introduced into the interior of the electrolytic cell 2 through the middle and lower parts of the electrolytic cell, and the nitrogen provided by the air separator 8 is divided into two paths. One path of nitrogen is introduced into the electrolytic cell 2, and the other path of nitrogen is introduced into the ammonia synthesis gas compressor 5 to adjust the nitrogen-hydrogen ratio required for the ammonia synthesis reaction. The air separator 8 is also used to recover the nitrogen in the nitrogen-oxygen mixed gas discharged from the electrolytic cell 2.

[0059] In this example, the purification unit includes a drying tower 4. The nitrogen-hydrogen mixed gas flowing through the drying tower 4 and the reaction product generated by the ammonia synthesizer 6 are heated and exchanged to form hot regeneration gas to supply heat for desorption of the drying tower 4, and the nitrogen-hydrogen mixed gas flowing through the drying tower 4 and the cold circulating gas generated by the ammonia synthesis unit are cooled and exchanged to form cold regeneration gas to cool and regenerate the drying tower 4. Wherein, the cold circulating gas is specifically the gas obtained after the reaction product generated by the ammonia synthesizer 6 is cooled and the gas-liquid separation effect of the ammonia gas-liquid separator 7.

[0060] The device system provided by Example 1 can be used to introduce nitrogen into the hydrogen production link and the ammonia synthesis link respectively, and there are the following two ways for introducing nitrogen into the hydrogen production link:

[0061] (1) Nitrogen is directly introduced into the interior of the electrolytic cell in a quantitative manner according to a preset amount.

[0062] (2) Nitrogen is directly introduced into the interior of the electrolytic cell in a variable manner according to the hydrogen production power or hydrogen production amount to maintain the stability of the total gas volume.

[0063] Wherein, the total gas volume specifically refers to the hydrogen production amount under full power conditions. For example, if the theoretical hydrogen production amount under full power conditions is A and the current actual hydrogen production amount is B, then the introduced nitrogen gas volume is A - B.

[0064] Example 3

[0065] This example provides a device system for coupling hydrogen production and ammonia synthesis. Except that the air separation machine 8 is changed to a nitrogen storage tank, the rest of the structure and conditions are the same as those in Example 1, so they will not be elaborated here.

[0066] Example 4

[0067] This example provides a device system for coupling hydrogen production and ammonia synthesis. As Figure 3 shown, the device system includes a nitrogen supply unit, a hydrogen production unit, a purification unit and an ammonia synthesis unit; the hydrogen production unit, the purification unit and the ammonia synthesis unit are connected in sequence, and the hydrogen production unit and the ammonia synthesis unit are respectively and independently connected to the nitrogen supply unit.

[0068] In this example, the nitrogen supply unit is an air separation machine 8; the hydrogen production unit includes an electrolytic cell 2 and an electrolyte circulation pump (not shown in the figure), and the electrolytic cell 2 is connected to the air separation machine 8. The upstream of the electrolytic cell 2 is also connected to a power source 1, and the downstream is also connected to a gas-liquid separator 3; wherein, the power source 1 can be a renewable energy power supply sub-unit, and the power source of the renewable energy power supply sub-unit can be wind power generation, photovoltaic power generation or a combination thereof. This example does not limit the specific form of the power source of the renewable energy power supply sub-unit; the nitrogen provided by the air separation machine 8 is introduced into the bottom of the electrolytic cell 2 through the outlet of the electrolyte circulation pump, and the nitrogen provided by the air separation machine 8 is divided into two paths. One path of nitrogen is introduced into the electrolytic cell 2, and the other path of nitrogen is introduced into the ammonia synthesis gas compressor 5 to adjust the nitrogen-hydrogen ratio required for the ammonia synthesis reaction. The air separation machine 8 is also used to recover the nitrogen in the nitrogen-oxygen mixed gas discharged from the electrolytic cell 2. The purification unit includes a drying tower 4.

[0069] The device system provided by Example 1 can introduce nitrogen into the hydrogen production link and the ammonia synthesis link respectively, and the introduction of nitrogen into the hydrogen production link includes the following two methods:

[0070] (1) Nitrogen is introduced into the bottom of the electrolytic cell through the outlet of the electrolyte circulation pump in a quantitative manner according to a preset amount.

[0071] (2) Nitrogen is introduced into the bottom of the electrolyzer through the outlet of the electrolyte circulation pump in a variable manner according to the hydrogen production power or hydrogen production amount to maintain the stability of the total gas volume.

[0072] Wherein, the total gas volume specifically refers to the hydrogen production amount under full power conditions. For example, the theoretical hydrogen production amount under full power conditions is A, and the current actual hydrogen production amount is B, then the introduced nitrogen amount is A - B.

[0073] It can be seen that the device system provided by the present invention not only realizes the deep integration between the hydrogen production process and the ammonia synthesis process, solves the current problems of hydrogen storage and transportation, but also connects the nitrogen supply unit and the hydrogen production unit to each other on this basis, so that nitrogen is introduced into the interior of the hydrogen production unit, improving the flow velocity of the fluid in the hydrogen production unit, and further reducing the temperature gradient in the hydrogen production unit. In addition, the nitrogen atmosphere reduces the lower limit of hydrogen-oxygen mixing in the hydrogen production unit, improving the safety and stability of the hydrogen production device.

[0074] The applicant declares that the above description is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the disclosure scope of the present invention.

Claims

1. An apparatus system for coupling hydrogen production and ammonia synthesis, characterized in that, The described device system includes a nitrogen supply unit, a hydrogen production unit, and an ammonia synthesis unit; The hydrogen production unit is connected to the ammonia synthesis unit, and the hydrogen production unit and the ammonia synthesis unit are respectively and independently connected to the nitrogen supply unit; The hydrogen production unit includes an electrolytic cell, and the nitrogen provided by the nitrogen supply unit is directly introduced into the interior of the electrolytic cell; Alternatively, the hydrogen production unit includes an electrolytic cell and an electrolyte circulation pump, and the nitrogen provided by the nitrogen supply unit is introduced into the bottom of the electrolytic cell through the outlet of the electrolyte circulation pump, and / or directly introduced into the interior of the electrolytic cell.

2. The apparatus system according to claim 1, characterized in that, The nitrogen supply unit includes an air separation unit and / or a nitrogen storage tank.

3. The apparatus system according to claim 2, characterized in that, The nitrogen provided by the air separation unit is divided into two paths. One path of nitrogen is introduced into the electrolytic cell, and the other path of nitrogen is introduced into the ammonia synthesis unit to adjust the nitrogen-hydrogen ratio required for the ammonia synthesis reaction.

4. The apparatus system according to claim 2, characterized in that, The air separation unit is also used to recover the nitrogen in the nitrogen-oxygen mixed gas discharged from the electrolytic cell.

5. The apparatus system according to claim 1, characterized in that, The device system further includes a purification unit, and the purification unit is connected between the hydrogen production unit and the ammonia synthesis unit; The purification unit includes a drying tower.

6. The apparatus system according to claim 5, characterized in that, The nitrogen-hydrogen mixed gas flowing through the purification unit and the reaction product generated by the ammonia synthesis unit are heated by heat exchange to form hot regeneration gas to supply heat for desorption of the drying tower.

7. The apparatus system according to claim 5, characterized in that, The nitrogen-hydrogen mixed gas flowing through the purification unit and the cold circulating gas generated by the ammonia synthesis unit are cooled by heat exchange to form cold regeneration gas to cool and regenerate the drying tower.

8. The apparatus system according to claim 1, characterized in that, The device system further includes a renewable energy power supply sub-unit for supplying the electric energy required by the device system.

9. A method for coupling hydrogen production and ammonia synthesis using the apparatus system according to any one of claims 1-8, characterized in that, The method includes: introducing nitrogen into the hydrogen production process and the ammonia synthesis process respectively.

10. The method according to claim 9, characterized in that, The introduction of nitrogen into the hydrogen production process includes the following two methods: (1) Introducing nitrogen into the electrolytic cell in the hydrogen production process in a quantitative manner according to a preset amount; (2) Introducing nitrogen into the electrolytic cell in the hydrogen production process in a variable manner according to the hydrogen production power or hydrogen production amount to maintain the stability of the total gas volume.

11. The method according to claim 10, characterized in that, After the nitrogen is introduced into the electrolytic cell in the hydrogen production process, a nitrogen-hydrogen mixed gas is formed, and the nitrogen-hydrogen mixed gas is purified and then introduced into the ammonia synthesis process as the raw material gas for the ammonia synthesis reaction.

12. The method according to claim 10, characterized in that, After the nitrogen is introduced into the electrolytic cell in the hydrogen production process, a nitrogen-oxygen mixed gas is formed, and the nitrogen-oxygen mixed gas is recycled to produce nitrogen.

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