A device 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 hydrogen purification unit and an ammonia synthesis unit connected in sequence; a recycle gas transfer unit is coupled between the hydrogen purification unit and the ammonia synthesis unit; the recycle gas transfer unit includes a hot recycle gas transfer component and / or a cold recycle gas transfer component. The method includes: transferring the recycle gas generated in the ammonia synthesis process to the hydrogen purification process as a regeneration gas. The device system provided by the present invention deeply couples the hydrogen production process and the ammonia synthesis process, reduces the device energy consumption of the system, reduces the energy loss of the system, and is conducive to large-scale popularization and application.

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] In recent years, hydrogen energy has gradually become a current research hotspot due to its many advantages such as high calorific value, zero emissions, pollution-free, and wide application. However, due to the small density and high risk of hydrogen, it has problems of difficult storage and transportation. Ammonia, as one of the most basic raw materials in modern chemical and agricultural production, is relatively easy to store and transport, and its production process generally involves a synthesis reaction of hydrogen and nitrogen. Therefore, synthesizing ammonia from hydrogen is one of the effective methods to solve the problem of hydrogen energy storage and transportation.

[0003] In this regard, some technical personnel have combined the electrolytic water hydrogen production technology with the ammonia synthesis technology, and coupled clean energy power generation. While achieving zero-carbon hydrogen production, hydrogen energy is stored and transported in the form of liquid ammonia, thus effectively solving the problem of difficult hydrogen energy storage and transportation.

[0004] However, although the above technology has realized the combination of hydrogen production and ammonia synthesis processes to convert hydrogen into ammonia, it only uses the hydrogen produced by the hydrogen production system as the feed gas for ammonia synthesis, and does not further couple and optimize the two processes and two systems, resulting in relatively high device energy consumption and energy loss in the hydrogen production and ammonia synthesis system.

[0005] Therefore, how to provide a device system and method for coupling hydrogen production and ammonia synthesis to achieve deep coupling of the hydrogen production process and the ammonia synthesis process, thereby reducing the device energy consumption of the system and reducing the energy loss of the system has become an urgent problem to be solved by those skilled in the art at present. Summary of the Invention

[0006] 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 couples the hydrogen production process and the ammonia synthesis process, reduces the device energy consumption of the system, reduces the energy loss of the system, and is conducive to large-scale popularization and application.

[0007] To achieve the purpose of this invention, the following technical solutions are adopted:

[0008] In the first aspect, the present invention provides a device system for coupling hydrogen production and ammonia synthesis, and the device system includes a hydrogen purification unit and an ammonia synthesis unit.

[0009] A circulating gas transfer unit is coupled between the hydrogen purification unit and the ammonia synthesis unit.

[0010] The circulating gas transfer unit includes a hot circulating gas transfer component and / or a cold circulating gas transfer component.

[0011] The device system provided by the present invention couples a recycle gas transfer unit between a hydrogen purification unit and an ammonia synthesis unit, so as to transfer the recycle gas generated in the ammonia synthesis process to the hydrogen purification process as regeneration gas, thereby making full use of the heat and / or cold of the recycle gas, reducing the device energy consumption of the system, reducing the energy loss of the system, and improving the energy utilization rate of the system.

[0012] In addition, due to the sufficient amount of the recycle gas, the device system provided by the present invention can also solve the problem of insufficient regeneration gas volume under variable power, and is particularly suitable for the coupling of renewable energy hydrogen production and ammonia synthesis with large fluctuations in output power, thereby ensuring the normal operation of the hydrogen purification process under the full power range, improving the system efficiency of hydrogen production and ammonia synthesis, extending the service life of the equipment, and being conducive to large-scale popularization and application.

[0013] Preferably, the hydrogen purification unit includes a drying tower.

[0014] Preferably, the recycle gas transfer unit is coupled between the drying tower and the ammonia synthesis unit.

[0015] Preferably, the hot recycle gas transfer component is used to transfer part / all of the hot recycle gas to the drying tower as hot regeneration gas.

[0016] Preferably, the hot recycle gas is the recycle gas obtained by heat exchange between the ammonia synthesis reaction raw material gas and the ammonia synthesis reaction product.

[0017] Preferably, the cold recycle gas transfer component is used to transfer part / all of the cold recycle gas to the drying tower as cold regeneration gas.

[0018] Preferably, the cold recycle gas is the recycle gas obtained after gas-liquid separation of the ammonia synthesis reaction product.

[0019] Preferably, the ammonia synthesis reaction raw material gas includes nitrogen and hydrogen output from the hydrogen purification unit.

[0020] Preferably, the ammonia synthesis reaction raw material gas further includes hot recycle gas and / or cold recycle gas.

[0021] Preferably, the ammonia synthesis unit includes a reaction gas-recycle gas heat exchanger and an ammonia gas-liquid separator.

[0022] Preferably, the hot recycle gas transfer component is arranged between the drying tower and the reaction gas-recycle gas heat exchanger.

[0023] Preferably, the cold recycle gas transfer component is arranged between the drying tower and the ammonia gas-liquid separator.

[0024] Preferably, the device system further includes a renewable energy power supply sub-unit for supplying the required electric energy to the device system.

[0025] 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.

[0026] 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: transferring the recycle gas generated in the ammonia synthesis section to the hydrogen purification section as the regeneration gas, and the recycle gas includes hot recycle gas and / or cold recycle gas.

[0027] The method provided by the present invention directly uses the hot recycle gas and / or cold recycle gas generated in the ammonia synthesis section as the regeneration gas in the hydrogen purification section, without an additional heat exchange process, and has a higher energy utilization rate.

[0028] Preferably, part or all of the hot recycle gas is transferred as the hot regeneration gas to the drying tower in the hydrogen purification section.

[0029] Preferably, part or all of the cold recycle gas is transferred as the cold regeneration gas to the drying tower in the hydrogen purification section.

[0030] Preferably, the gas volume of the hot recycle gas transferred to the drying tower in the hydrogen purification section is 30% of the hydrogen production amount under the full power of the device system.

[0031] Preferably, the gas volume of the cold recycle gas transferred to the drying tower in the hydrogen purification section is 30% of the hydrogen production amount under the full power of the device system.

[0032] The above-mentioned 30% is only a preferred value, not limited thereto, and may also be other values, which can be set as needed by those skilled in the art according to the actual situation.

[0033] Preferably, after flowing through the drying tower, the hot recycle gas and / or cold recycle gas is used as the raw material gas in the ammonia synthesis section for ammonia synthesis reaction.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) The device system provided by the present invention couples a recycle gas transfer unit between the hydrogen purification unit and the ammonia synthesis unit, so as to transfer the recycle gas generated in the ammonia synthesis process to the hydrogen purification process as the regeneration gas, thereby making full use of the heat and / or cold of the recycle gas, reducing the device energy consumption of the system, reducing the energy loss of the system, and improving the energy utilization rate of the system. In addition, due to the sufficient amount of the recycle gas, the device system provided by the present invention can also solve the problem of insufficient regeneration gas volume under variable power, and is particularly suitable for the coupling of renewable energy hydrogen production and ammonia synthesis with large fluctuations in output power, thereby ensuring the normal operation of the hydrogen purification process in the full power range, improving the system efficiency of hydrogen production and ammonia synthesis, extending the service life of the equipment, and being conducive to large-scale popularization and application;

[0036] (2) The method provided by the present invention directly uses the hot recycle gas and / or cold recycle gas generated in the ammonia synthesis process as the regeneration gas for the hydrogen purification process, without an additional heat exchange process, and has a higher energy utilization rate. Description of the Drawings

[0037] Figure 1 is a schematic diagram of the device system for coupling hydrogen production and ammonia synthesis provided by the present invention;

[0038] Figure 2 is a flowchart of the method for coupling hydrogen production and ammonia synthesis by the device system provided by the present invention;

[0039] Figure 3 is a schematic diagram of the device system for coupling hydrogen production and ammonia synthesis provided in Embodiment 3;

[0040] Figure 4 is a schematic diagram of the device system for coupling hydrogen production and ammonia synthesis provided in Embodiment 4.

[0041] Wherein: 1 - power supply; 2 - electrolyzer; 3 - gas-liquid separator; 4 - drying tower; 5 - ammonia synthesis gas compressor; 6 - ammonia synthesizer; 7 - ammonia gas-liquid separator. Detailed Embodiments

[0042] 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.

[0043] The present invention provides a device system for coupling hydrogen production and ammonia synthesis, as Figure 1 shown, the device system includes a hydrogen purification unit and an ammonia synthesis unit, a recycle gas transfer unit is coupled between the hydrogen purification unit and the ammonia synthesis unit, and the recycle gas transfer unit includes a hot recycle gas transfer component and / or a cold recycle gas transfer component. The device system further includes a hydrogen production unit, and the hydrogen production unit provides hydrogen for the hydrogen purification unit.

[0044] Specifically, the hydrogen production unit includes an electrolytic cell 2 and a gas-liquid separator 3 connected in sequence; the hydrogen purification unit includes a drying tower 4; the ammonia synthesis unit includes an ammonia synthesis gas compressor 5, an ammonia synthesizer 6, a reaction gas-circulation gas heat exchanger (not shown in the figure), and an ammonia gas-liquid separator 7 connected in sequence. A circulation gas transfer unit is coupled between the drying tower and the ammonia synthesis unit.

[0045] In the present invention, the hot circulation gas transfer component is used to transfer part / all of the hot circulation gas to the drying tower 4 as hot regeneration gas, and the hot circulation gas is the circulation gas obtained by heat exchange between the ammonia synthesis reaction raw material gas and the ammonia synthesis reaction product; the cold circulation gas transfer component is used to transfer part / all of the cold circulation gas to the drying tower 4 as cold regeneration gas, and the cold circulation gas is the circulation gas obtained after gas-liquid separation of the ammonia synthesis reaction product. Among them, the ammonia synthesis reaction raw material gas includes nitrogen and the hydrogen output from the hydrogen purification unit, and may further include hot circulation gas and / or cold circulation gas.

[0046] In addition, the hot circulation gas transfer component is arranged between the drying tower 4 and the reaction gas-circulation gas heat exchanger (not shown in the figure), and the cold circulation gas transfer component is arranged between the drying tower 4 and the ammonia gas-liquid separator 7.

[0047] The device system further includes a renewable energy power supply sub-unit for supplying the required electric energy to the device system, such as Figure 1 the shown 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.

[0048] It can be seen that the device system provided by the present invention couples a circulation gas transfer unit between the hydrogen purification unit and the ammonia synthesis unit, so as to transfer the circulation gas generated in the ammonia synthesis process to the hydrogen purification process as regeneration gas, thereby making full use of the heat and / or cold of the circulation gas, reducing the device energy consumption of the system, reducing the energy loss of the system, and improving the energy utilization rate of the system. In addition, due to the sufficient gas volume of the circulation gas, the device system provided by the present invention can also solve the problem of insufficient regeneration gas volume under variable power, and is particularly suitable for the coupling of hydrogen production from renewable energy with large output power fluctuations and ammonia synthesis, thereby ensuring the normal operation of the hydrogen purification process in the full power range, improving the system efficiency of hydrogen production and ammonia synthesis, extending the service life of the equipment, and being conducive to large-scale popularization and application.

[0049] The present invention also provides a method for coupling hydrogen production and ammonia synthesis using the above device system, such as Figure 2As shown, the method includes: transferring the recycle gas generated in the ammonia synthesis section to the hydrogen purification section as the regeneration gas, and the recycle gas includes hot recycle gas and / or cold recycle gas.

[0050] Specifically, part / all of the hot recycle gas is transferred to the drying tower 4 in the hydrogen purification section as the hot regeneration gas for the heating regeneration of the drying tower 4. When part is transferred, the gas volume of the hot recycle gas transferred to the drying tower 4 is 30% of the hydrogen production amount under the full power of the device system; part / all of the cold recycle gas is transferred to the drying tower 4 in the hydrogen purification section as the cold regeneration gas for the cold tower treatment of the drying tower 4. When part is transferred, the gas volume of the cold recycle gas transferred to the drying tower 4 is 30% of the hydrogen production amount under the full power of the device system. After the hot recycle gas and / or cold recycle gas flow through the drying tower 4, they are used as the raw material gas for the ammonia synthesis section to carry out the ammonia synthesis reaction.

[0051] The above method directly uses the hot recycle gas and / or cold recycle gas generated in the ammonia synthesis section as the regeneration gas in the hydrogen purification section, without an additional heat exchange process, and has a higher energy utilization rate.

[0052] Example 1

[0053] This example provides a device system for coupling hydrogen production and ammonia synthesis, as Figure 1 shown. The device system includes a power supply 1, a hydrogen production unit, a hydrogen purification unit, and an ammonia synthesis unit connected in sequence. A recycle gas transfer unit is coupled between the hydrogen purification unit and the ammonia synthesis unit, and the recycle gas transfer unit includes a hot recycle gas transfer component and a cold recycle gas transfer component.

[0054] Specifically, the hydrogen production unit includes an electrolytic cell 2 and a gas-liquid separator 3 connected in sequence; the hydrogen purification unit includes a drying tower 4; the ammonia synthesis unit includes an ammonia synthesis gas compressor 5, an ammonia synthesizer 6, a reaction gas-recycle gas heat exchanger (not shown in the figure), and an ammonia gas-liquid separator 7 connected in sequence.

[0055] In this example, the hot recycle gas transfer component is used to transfer all the hot recycle gas to the drying tower 4 as the hot regeneration gas, and the hot recycle gas is the recycle gas obtained by heat exchange between the ammonia synthesis reaction raw material gas and the ammonia synthesis reaction product; the cold recycle gas transfer component is used to transfer all the cold recycle gas to the drying tower 4 as the cold regeneration gas, and the cold recycle gas is the recycle gas obtained after gas-liquid separation of the ammonia synthesis reaction product. Among them, the ammonia synthesis reaction raw material gas includes nitrogen, hydrogen output by the hydrogen purification unit, the hot recycle gas, and the cold recycle gas.

[0056] In addition, the hot recycle gas transfer assembly is disposed between the drying tower 4 and the reaction gas-recycle gas heat exchanger (not shown in the figure), and the cold recycle gas transfer assembly is disposed between the drying tower 4 and the ammonia gas-liquid separator 7.

[0057] Using the device system provided in Example 1, the recycle gas generated in the ammonia synthesis section can be transferred to the hydrogen purification section as the regeneration gas, and the recycle gas includes hot recycle gas and cold recycle gas. Among them, all of the hot recycle gas is transferred to the drying tower 4 in the hydrogen purification section as the hot regeneration gas for the heating regeneration of the drying tower 4; all of the cold recycle gas is transferred to the drying tower 4 in the hydrogen purification section as the cold regeneration gas for the cold tower treatment of the drying tower 4. After the hot recycle gas and the cold recycle gas flow through the drying tower 4, they are used as the raw material gas for the ammonia synthesis reaction in the ammonia synthesis section.

[0058] Example 2

[0059] This example provides a device system for coupling hydrogen production and ammonia synthesis, as Figure 1 shown, the device system includes a power supply 1, a hydrogen production unit, a hydrogen purification unit, and an ammonia synthesis unit connected in sequence. A recycle gas transfer unit is coupled between the hydrogen purification unit and the ammonia synthesis unit, and the recycle gas transfer unit includes a hot recycle gas transfer assembly and a cold recycle gas transfer assembly.

[0060] Specifically, the hydrogen production unit includes an electrolytic cell 2 and a gas-liquid separator 3 connected in sequence; the hydrogen purification unit includes a drying tower 4; the ammonia synthesis unit includes an ammonia synthesis gas compressor 5, an ammonia synthesizer 6, a reaction gas-recycle gas heat exchanger (not shown in the figure), and an ammonia gas-liquid separator 7 connected in sequence.

[0061] In this example, the hot recycle gas transfer assembly is used to transfer part of the hot recycle gas to the drying tower 4 as the hot regeneration gas, and the hot recycle gas is the recycle gas obtained by heat exchange between the raw material gas for the ammonia synthesis reaction and the product of the ammonia synthesis reaction. The gas volume of the hot recycle gas transferred to the drying tower 4 is 30% of the hydrogen production amount under the full power of the device system; the cold recycle gas transfer assembly is used to transfer part of the cold recycle gas to the drying tower 4 as the cold regeneration gas, and the cold recycle gas is the recycle gas obtained after gas-liquid separation of the product of the ammonia synthesis reaction. The gas volume of the cold recycle gas transferred to the drying tower 4 is 30% of the hydrogen production amount under the full power of the device system. Among them, the raw material gas for the ammonia synthesis reaction includes nitrogen, hydrogen output from the hydrogen purification unit, the hot recycle gas, and the cold recycle gas.

[0062] In addition, the hot recycle gas transfer assembly is disposed between the drying tower 4 and the reaction gas-recycle gas heat exchanger (not shown in the figure), and the cold recycle gas transfer assembly is disposed between the drying tower 4 and the ammonia gas-liquid separator 7.

[0063] Using the device system provided in Example 1, part of the recycle gas generated in the ammonia synthesis section can be transferred to the hydrogen purification section as the regeneration gas, and the recycle gas includes hot recycle gas and cold recycle gas. Among them, the gas volumes of the hot recycle gas and the cold recycle gas transferred to the drying tower 4 are independently 30% of the hydrogen production amount under the full power of the device system. After the hot recycle gas and the cold recycle gas flow through the drying tower 4, they are used as the raw material gas for the ammonia synthesis section to carry out the ammonia synthesis reaction.

[0064] Example 3

[0065] This example provides a device system for coupling hydrogen production and ammonia synthesis. As Figure 3 shown, the device system includes a power supply 1, a hydrogen production unit, a hydrogen purification unit, and an ammonia synthesis unit connected in sequence. A recycle gas transfer unit is coupled between the hydrogen purification unit and the ammonia synthesis unit, and the recycle gas transfer unit includes a hot recycle gas transfer component.

[0066] Specifically, the hydrogen production unit includes an electrolytic cell 2 and a gas-liquid separator 3 connected in sequence; the hydrogen purification unit includes a drying tower 4; the ammonia synthesis unit includes an ammonia synthesis gas compressor 5, an ammonia synthesizer 6, a reaction gas-recycle gas heat exchanger (not shown in the figure), and an ammonia gas-liquid separator 7 connected in sequence.

[0067] In this example, the hot recycle gas transfer component is used to transfer all the hot recycle gas to the drying tower 4 as the hot regeneration gas, and the hot recycle gas is the recycle gas obtained by heat exchange between the raw material gas for the ammonia synthesis reaction and the product of the ammonia synthesis reaction. Among them, the raw material gas for the ammonia synthesis reaction includes nitrogen, the hydrogen output by the hydrogen purification unit, and the hot recycle gas.

[0068] In addition, the hot recycle gas transfer component is arranged between the drying tower 4 and the reaction gas-recycle gas heat exchanger (not shown in the figure).

[0069] Using the device system provided in Example 1, the hot recycle gas generated in the ammonia synthesis section can be transferred to the hydrogen purification section as the regeneration gas. Among them, all of the hot recycle gas is transferred to the drying tower 4 in the hydrogen purification section as the hot regeneration gas for the heating regeneration of the drying tower 4, and after the hot recycle gas flows through the drying tower 4, it is used as the raw material gas for the ammonia synthesis section to carry out the ammonia synthesis reaction.

[0070] Example 4

[0071] This example provides a device system for coupling hydrogen production and ammonia synthesis. As Figure 4 shown, the device system includes a power supply 1, a hydrogen production unit, a hydrogen purification unit, and an ammonia synthesis unit connected in sequence. A recycle gas transfer unit is coupled between the hydrogen purification unit and the ammonia synthesis unit, and the recycle gas transfer unit includes a cold recycle gas transfer component.

[0072] Specifically, the hydrogen production unit includes an electrolytic cell 2 and a gas-liquid separator 3 connected in sequence; the hydrogen purification unit includes a drying tower 4; the ammonia synthesis unit includes an ammonia synthesis gas compressor 5, an ammonia synthesizer 6, a reaction gas-circulation gas heat exchanger (not shown in the figure), and an ammonia gas-liquid separator 7 connected in sequence.

[0073] In this embodiment, the cold recycle gas transfer assembly is used to transfer all the cold recycle gas to the drying tower 4 as cold regeneration gas, and the cold recycle gas is the recycle gas obtained after gas-liquid separation of the ammonia synthesis reaction product. The raw material gas for the ammonia synthesis reaction includes nitrogen, hydrogen output from the hydrogen purification unit, and the cold recycle gas.

[0074] In addition, the cold recycle gas transfer assembly is disposed between the drying tower 4 and the ammonia gas-liquid separator 7.

[0075] The device system provided by Embodiment 1 can transfer the cold recycle gas generated in the ammonia synthesis process to the hydrogen purification process as regeneration gas. Among them, all of the cold recycle gas is transferred to the drying tower 4 in the hydrogen purification process as cold regeneration gas for cold tower treatment of the drying tower 4, and the cold recycle gas flows through the drying tower 4 and then is used as the raw material gas for the ammonia synthesis process for ammonia synthesis reaction.

[0076] It can be seen that the device system provided by the present invention couples a recycle gas transfer unit between the hydrogen purification unit and the ammonia synthesis unit, so as to transfer the recycle gas generated in the ammonia synthesis process to the hydrogen purification process as regeneration gas, thereby making full use of the heat and / or cold of the recycle gas, reducing the device energy consumption of the system, reducing the energy loss of the system, and improving the energy utilization rate of the system. In addition, due to the sufficient amount of the recycle gas, the device system provided by the present invention can also solve the problem of insufficient regeneration gas volume under variable power, and is particularly suitable for the coupling of renewable energy hydrogen production and ammonia synthesis with large fluctuations in output power, thereby ensuring the normal operation of the hydrogen purification process in the full power range, improving the system efficiency of hydrogen production and ammonia synthesis, extending the service life of the equipment, and being conducive to large-scale popularization and application.

[0077] In addition, the method provided by the present invention directly uses the hot recycle gas and / or cold recycle gas generated in the ammonia synthesis process as the regeneration gas for the hydrogen purification process, without an additional heat exchange process, and has a higher energy utilization rate.

[0078] 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. A device system for coupling hydrogen production and ammonia synthesis, characterized in that, The described device system includes a hydrogen purification unit and an ammonia synthesis unit; A recycle gas transfer unit is coupled between the hydrogen purification unit and the ammonia synthesis unit; The recycle gas transfer unit includes a hot recycle gas transfer component and / or a cold recycle gas transfer component; The hydrogen purification unit includes a drying tower; The hot recycle gas transfer component is used to transfer part / all of the hot recycle gas to the drying tower as hot regeneration gas; The hot recycle gas is the recycle gas obtained by heat exchange between the raw material gas for ammonia synthesis and the product of ammonia synthesis reaction; The cold recycle gas transfer component is used to transfer part / all of the cold recycle gas to the drying tower as cold regeneration gas; The cold recycle gas is the recycle gas obtained after gas-liquid separation of the product of ammonia synthesis reaction.

2. The device system according to claim 1, wherein, The raw material gas for ammonia synthesis reaction includes nitrogen and hydrogen output from the hydrogen purification unit.

3. The device system according to claim 2, wherein, The raw material gas for ammonia synthesis reaction further includes hot recycle gas and / or cold recycle gas.

4. The device system according to claim 1, characterized in that, The ammonia synthesis unit includes a reaction gas-recycle gas heat exchanger and an ammonia gas-liquid separator; The hot recycle gas transfer component is arranged between the drying tower and the reaction gas-recycle gas heat exchanger; The cold recycle gas transfer component is arranged between the drying tower and the ammonia gas-liquid separator.

5. The device system according to claim 1, wherein The device system further includes a renewable energy power supply sub-unit for supplying the required electric energy to the device system.

6. A method for coupling hydrogen production and ammonia synthesis using the device system according to any one of claims 1-5, characterized in that, The method includes: transferring the recycle gas generated in the ammonia synthesis process to the hydrogen purification process as regeneration gas, and the recycle gas includes hot recycle gas and / or cold recycle gas.

7. The method according to claim 6, characterized in that, Part / all of the hot recycle gas is transferred to the drying tower in the hydrogen purification process as hot regeneration gas; Part / all of the cold recycle gas is transferred to the drying tower in the hydrogen purification process as cold regeneration gas.

8. The method according to claim 7, wherein The gas volume of the hot recycle gas transferred to the drying tower in the hydrogen purification process is 30% of the hydrogen production amount under the full power of the device system; The gas volume of the cold recycle gas transferred to the drying tower in the hydrogen purification process is 30% of the hydrogen production amount under the full power of the device system.

9. The method according to claim 6, characterized in that, The hot recycle gas and / or cold recycle gas flows through the drying tower and then serves as the raw material gas for the ammonia synthesis process to carry out the ammonia synthesis reaction.

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