Compound device for providing feed gas for preparing green ammonia from new energy and green ammonia synthesis system

Abstract

The utility model provides a compound device for providing feed gas for preparing green ammonia from new energy and a green ammonia synthesis system. The composite device comprises a deep cooling air separation nitrogen generation subsystem, a hydrogen supply subsystem and a main heat exchanger, and the hydrogen supply subsystem comprises a water electrolysis hydrogen generation unit, a first hydrogen compressor, a second hydrogen compressor, a hydrogen storage tank and a hydrogen conveying pipeline. The hydrogen conveying pipeline comprises a first hydrogen conveying pipeline, a second hydrogen conveying pipeline and a third hydrogen conveying pipeline; the main heat exchanger is a multi-channel heat exchanger and comprises a first flowing channel used for flowing of a first medium and a second flowing channel used for flowing of a second medium, the second hydrogen compressor is connected with the hydrogen storage tank through the first flowing channel, and the hydrogen storage tank is connected with the third hydrogen conveying pipeline through the second flowing channel. The composite device provided by the utility model can ensure the supply stability of the raw material hydrogen of the ammonia production subsystem, and solves the technical problem that the hydrogen supply is unstable in the existing green ammonia synthesis process.

Description

TECHNICAL FIELD

[0001] The utility model belongs to green ammonia synthesis technical field, concretely relates to a kind of composite device and green ammonia synthesis system for providing raw material gas for new energy green ammonia. BACKGROUND

[0002] Renewable energy can reduce carbon emissions from the source, and is an important means to address energy resource shortages, environmental degradation and climate warming globally. However, renewable energy generation has large load fluctuations and poor stability, which affects renewable energy generation and utilization efficiency, and causes serious wind and light abandonment. Green ammonia (green ammonia) is produced using renewable energy (such as solar and wind energy), aiming to reduce carbon emissions in traditional ammonia production, and is an important part of achieving carbon neutrality.

[0003] The production process of green ammonia mainly includes three steps: first, using renewable energy to generate electricity; second, using renewable energy as power source, water is electrolyzed into hydrogen and oxygen by electrolysis device, and hydrogen is captured for subsequent synthesis; finally, hydrogen and nitrogen in air are synthesized into ammonia by Haber-Bosch process or more efficient alternative process under the action of catalyst. During the entire process, except for the trace amount of waste produced by the catalyst, almost no additional greenhouse gas emissions are generated, achieving truly green production. Compared with traditional ammonia synthesis process, the synthesis of green ammonia is greatly affected by energy and raw material supply, and needs to consider economy and safety, coordinate hydrogen production, nitrogen production, ammonia production and other sections, flexibly optimize ammonia synthesis process, systematically regulate energy and raw material supply, and stably provide hydrogen for ammonia synthesis section. The cold energy and heat energy in the process of hydrogen production, nitrogen production and ammonia synthesis are fully utilized.

[0004] Among them, the raw material gas hydrogen supply unit needs to scientifically and reasonably integrate hydrogen production and hydrogen storage to provide continuous and stable hydrogen for ammonia synthesis section due to the intermittency of renewable new energy generation such as wind and light, and the instability of water electrolysis hydrogen production. Currently, there are four types of hydrogen storage methods, including high-pressure gaseous hydrogen storage, low-temperature liquid hydrogen storage, organic liquid hydrogen storage and solid hydrogen storage. Among them, gaseous hydrogen storage has low cost, and liquid hydrogen storage has high cost and high hydrogen storage density. UTILITY MODEL CONTENTS

[0005] The utility model aims to solve the technical problems of unstable supply of water electrolysis hydrogen as raw material for ammonia synthesis caused by renewable new energy generation and large volume of large-scale hydrogen storage, and provides a composite device capable of providing raw material support for flexible and stable operation of new energy ammonia production.

[0006] To achieve the above object, the utility model provides a kind of for new energy green ammonia preparation raw material gas composite device, the raw material gas includes hydrogen and nitrogen, the composite device includes cryogenic air separation nitrogen subsystem, hydrogen supply subsystem, and for the heat exchange of cryogenic air separation nitrogen subsystem and hydrogen supply subsystem main heat exchanger, wherein: the hydrogen supply subsystem includes electrolytic water preparation hydrogen unit, first hydrogen compressor and second hydrogen compressor connected in turn, hydrogen storage tank connected with the main heat exchanger, and hydrogen delivery pipeline, the hydrogen delivery pipeline includes first hydrogen delivery pipeline and second hydrogen delivery pipeline that are connected and with the outlet of the first hydrogen compressor, and third hydrogen delivery pipeline connected with the main heat exchanger, the second hydrogen delivery pipeline and the third hydrogen delivery pipeline are used to be connected with the hydrogen inlet of ammonia preparation subsystem;The main heat exchanger is multichannel heat exchanger, including the first flow channel for the flow of first medium, and the second flow channel for the flow of second medium, the medium inlet of the first flow channel is connected with the outlet of the second hydrogen compressor, and the medium outlet of the first flow channel is connected with the import of the hydrogen storage tank;The medium inlet of the second flow channel is connected with the outlet of the hydrogen storage tank, and the medium outlet of the second flow channel is connected with the third hydrogen delivery pipeline.

[0007] In a specific embodiment, the hydrogen storage tank is a high-pressure low-temperature hydrogen storage tank, and the main heat exchanger is a plate heat exchanger.

[0008] In a specific embodiment, the hydrogen delivery pipeline further includes a first valve installed on the first hydrogen delivery pipeline and a second valve installed on the second hydrogen delivery pipeline.

[0009] In a specific embodiment, the power supply of the electrolytic water preparation hydrogen unit is provided by renewable new energy. When the renewable new energy is abundant, both the first valve and the second valve are opened. When there is no renewable energy or the renewable new energy is insufficient, the second valve is closed.

[0010] In a specific embodiment, the hydrogen delivery pipeline further includes a connecting pipeline, one end of which is connected with the outlet of the first hydrogen compressor and the other end of which is respectively connected with the first hydrogen delivery pipeline and the second hydrogen delivery pipeline.

[0011] In a specific embodiment, the cryogenic air separation and nitrogen production subsystem comprises, in sequence, an air filter, an air compressor, an air pre-cooler, an air purifier and a rectification tower, and a nitrogen compressor, the gas outlet of the nitrogen compressor being connected to the nitrogen inlet of the ammonia production subsystem; the main heat exchanger further comprises a third flow channel for the flow of a third medium and a fourth flow channel for the flow of a fourth medium, wherein the medium inlet of the third flow channel is connected to the gas outlet of the air purifier, the medium outlet of the third flow channel is connected to the gas inlet of the rectification tower, the medium inlet of the fourth flow channel is connected to the nitrogen gas outlet of the rectification tower, and the medium outlet of the fourth flow channel is connected to the gas inlet of the nitrogen compressor.

[0012] In a specific embodiment, the cryogenic air separation and nitrogen production subsystem further comprises an expander for providing a cold source.

[0013] In a specific embodiment, the main heat exchanger further comprises a fifth flow channel for the flow of a fifth medium, the medium inlet of the fifth flow channel being connected to the outlet of the expander, and the medium outlet of the fifth flow channel being connected to the inlet of the expander.

[0014] The utility model also provides a flexible green ammonia synthesis system, the flexible green ammonia synthesis system includes for providing raw material gas composite device, and ammonia production subsystem, the raw material gas includes hydrogen and nitrogen, for providing raw material gas composite device is composite device above-mentioned.

[0015] In a specific embodiment, the first hydrogen delivery pipeline of the hydrogen supply subsystem is in communication with the hydrogen inlet of the ammonia production subsystem, and / or the third hydrogen delivery pipeline of the hydrogen supply subsystem is in communication with the hydrogen inlet of the ammonia production subsystem, and the gas outlet of the nitrogen compressor of the cryogenic air separation and nitrogen production subsystem is in communication with the nitrogen inlet of the ammonia production subsystem.

[0016] The utility model also provides a Fenton oxidation reaction device, including reaction pool, and for aeration mechanism of aeration of reaction pool, aeration mechanism is aeration mechanism above-mentioned.

[0017] The utility model has at least the following beneficial effects:

[0018] The utility model provides a composite device for new energy green ammonia raw material gas provides including cryogenic air separation nitrogen subsystem, hydrogen supply subsystem, and be used for the heat exchange of cryogenic air separation nitrogen subsystem and hydrogen supply subsystem's main heat exchanger, the hydrogen supply subsystem includes the electrolytic water preparation hydrogen unit, first hydrogen compressor and second hydrogen compressor connected in proper order, hydrogen storage tank connected with the main heat exchanger, and hydrogen delivery pipeline, the hydrogen delivery pipeline includes the first hydrogen delivery pipeline and second hydrogen delivery pipeline that are connected with the outlet of first hydrogen compressor and are arranged in parallel, and the third hydrogen delivery pipeline is connected with the main heat exchanger, and the second hydrogen delivery pipeline and the third hydrogen delivery pipeline are used to be connected with the hydrogen inlet of ammonia preparation subsystem, the main heat exchanger is multichannel heat exchanger, including the first flow channel for the first medium flow, and the second flow channel for the second medium flow, the second hydrogen compressor is connected with hydrogen storage tank through the first flow channel, and hydrogen storage tank is connected with the third hydrogen delivery pipeline through the second flow channel, in this way, when renewable energy is large, the hydrogen of electrolytic water preparation hydrogen unit generates stably, at this time, a part of hydrogen enters ammonia preparation subsystem directly, and the hydrogen of excess hydrogen is stored after cooling through main heat exchanger and carries out hydrogen storage tank, when there is no renewable energy or renewable energy is small, the hydrogen of electrolytic water preparation hydrogen unit generates all and supplies ammonia preparation subsystem, simultaneously, the hydrogen in hydrogen storage tank is introduced to ammonia preparation subsystem after heat exchange through main heat exchanger, to guarantee the stability of hydrogen supply of ammonia preparation subsystem, solve the raw material supply instability of the hydrogen supply of existing green ammonia synthesis process due to the instability of new energy power generation.

[0019] The utility model uses cryogenic air separation nitrogen, uses the low temperature hydrogen stored when new energy is large as cold source, can greatly improve the operation flexibility of traditional cryogenic air separation nitrogen, improves from 70 to 100 to 40 to 100, can well match the raw material load change demand of back end synthetic ammonia.

[0020] The utility model uses high pressure low temperature hydrogen storage, uses the cold quantity of cryogenic air nitrogen to reduce hydrogen storage temperature, improves hydrogen storage density, has higher storage density and economy than traditional gaseous hydrogen storage, has higher economy and lower hydrogen storage unit energy consumption than low temperature liquid hydrogen storage.

[0021] The utility model uses cryogenic air separation nitrogen and high pressure low temperature hydrogen storage combined device, and the whole operation flexibility can improve 42%, provides raw material support for the flexible and stable operation of new energy ammonia.

[0022] V. Make full use of the excess of wind and light, through the refrigeration system to make cold hydrogen storage, no wind or wind power generation is small, release the stored low temperature hydrogen, through heat for cryogenic nitrogen system to provide the required cold, both can achieve the effect of energy storage, but also for subsequent ammonia synthesis to provide qualified hydrogen and nitrogen gas raw materials.

[0023] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages. Below, the utility model will be further detailed with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The overall schematic diagram of the composite device for providing raw gas for green ammonia of new energy is provided for an embodiment of the utility model. DETAILED DESCRIPTION

[0025] The embodiments of the utility model will be described in detail below with reference to the drawings.

[0026] Please refer to Figure 1 The utility model provides a kind of composite device 100 for providing raw gas for green ammonia of new energy, and the raw gas includes hydrogen and nitrogen, which can solve the problem of unstable supply of water electrolysis hydrogen as ammonia synthesis raw material caused by renewable energy power generation and large-scale hydrogen storage volume, and can provide raw material support for flexible and stable operation of new energy ammonia synthesis.

[0027] The composite device 100 includes a cryogenic air separation nitrogen sub-system 10, a hydrogen supply sub-system 20, and a main heat exchanger 30 for heat exchange between the cryogenic air separation nitrogen sub-system 10 and the hydrogen supply sub-system 20.

[0028] The cryogenic air separation nitrogen sub-system 10 includes an air filter 11, an air compressor 12, an air pre-cooler 13, an air purifier 14, a rectifying tower 15 and a nitrogen compressor 16 connected in sequence by pipelines, and an expander 17 connected with the main heat exchanger 30, wherein the expander 17 is used to provide cold energy for the main heat exchanger 30.

[0029] The hydrogen supply sub-system 20 includes an electrolytic water hydrogen production unit 21, a first hydrogen compressor 22 and a second hydrogen compressor 23 connected in sequence, a hydrogen storage tank 24 connected with the main heat exchanger 30, and a hydrogen delivery pipeline 25.

[0030] The hydrogen delivery pipeline 25 includes a first hydrogen delivery pipeline 251, a second hydrogen delivery pipeline 252 connected in parallel with the first hydrogen delivery pipeline 251, a third hydrogen delivery pipeline 253, a connecting pipeline 254, a first valve 255 installed on the first hydrogen delivery pipeline 251, and a second valve 256 installed on the second hydrogen delivery pipeline 252, wherein one end of the connecting pipeline 254 is connected with the first hydrogen compressor 22, and the other end is connected with the first hydrogen delivery pipeline 251 and the second hydrogen delivery pipeline 252 respectively, the other end of the first hydrogen delivery pipeline 251 is used to be connected with an ammonia production subsystem, the other end of the second hydrogen delivery pipeline 252 is connected with the second hydrogen compressor 23, and one end of the third hydrogen delivery pipeline 253 is connected with the main heat exchanger 30 and the other end is used to be connected with the ammonia production subsystem.

[0031] Preferably, the power supply of the electrolytic water ammonia production unit 21 is provided by renewable new energy, when the renewable new energy is large, the first valve 255 and the second valve 256 are both opened, when there is no renewable energy or the renewable new energy is small, the second valve is closed.

[0032] Preferably, when the renewable new energy is large, the first hydrogen delivery pipeline 251 is used to be connected with the ammonia production subsystem; when the renewable new energy is small, the first hydrogen delivery pipeline 251 and the third hydrogen delivery pipeline 253 are used to be connected with the ammonia production subsystem respectively; when there is no renewable energy, the third hydrogen delivery pipeline 253 is used to be connected with the ammonia production subsystem.

[0033] In this way, the stability of the hydrogen provided to the ammonia production subsystem can be guaranteed whether the renewable energy power supply is stable or not, thereby solving the problem of unstable hydrogen supply in the green ammonia synthesis process of the prior art.

[0034] Preferably, the main heat exchanger 30 is a plate heat exchanger.

[0035] The main heat exchanger 30 is a multi-channel heat exchanger, which includes a first flow channel for the flow of a first medium, a second flow channel for the flow of a second medium, a third flow channel for the flow of a third medium, a fourth flow channel for the flow of a fourth medium, and a fifth flow channel for the flow of a fifth medium.

[0036] The medium inlet of the first flow channel is connected with the outlet of the second hydrogen compressor 23, and the medium outlet of the first flow channel is connected with the inlet of the hydrogen storage tank 24; the medium inlet of the second flow channel is connected with the outlet of the hydrogen storage tank 24, and the medium outlet of the second flow channel is connected with the third hydrogen conveying pipeline 253; the medium inlet of the third flow channel is connected with the gas outlet of the air purifier 14, and the medium outlet of the third flow channel is connected with the gas inlet of the rectifying tower 15; the medium inlet of the fourth flow channel is connected with the nitrogen outlet of the rectifying tower 15, and the medium outlet of the fourth flow channel is connected with the gas inlet of the nitrogen compressor 16; the medium inlet of the fifth flow channel is connected with the outlet of the expander 17, and the medium outlet of the fifth flow channel is connected with the inlet of the expander 17.

[0037] That is, the second air compressor 23 and the hydrogen storage tank 24 are connected through the first flow channel of the main heat exchanger, the hydrogen storage tank 24 and the third hydrogen conveying pipeline 253 are connected through the second flow channel of the main heat exchanger, the air purifier 14 and the rectifying tower 15 are connected through the third flow channel of the main heat exchanger, and the nitrogen outlet of the rectifying tower 15 and the nitrogen compressor 15 are connected through the fourth flow channel of the main heat exchanger.

[0038] The composite device 100 provided by the utility model can be adjusted according to the hydrogen production of renewable new energy, can meet the characteristics of renewable new energy, can provide relatively stable raw materials for subsequent ammonia synthesis, and has a certain long-time energy storage function.

[0039] In the utility model, renewable new energy large production refers to photovoltaic power generation and wind power generation large production, and renewable energy small production refers to photovoltaic power generation and wind power generation small production.

[0040] When renewable new energy large production is as follows:

[0041] The ammonia raw material supply process route is as follows: hydrogen: hydrogen from front-end water electrolysis is introduced into a first hydrogen compressor 22, part of the hydrogen is directly introduced out of the first hydrogen compressor 22 to serve as ammonia synthesis raw material gas in an ammonia sub-system, and the remaining hydrogen is compressed by a second hydrogen compressor to the working pressure of a hydrogen storage tank 24, the pressure can be selected from 22-35MPa, is cooled to -190 DEG C by the main heat exchanger, and is stored in a high-pressure low-temperature hydrogen storage tank. Nitrogen: after air, waste gas returned from a rectifying tower and nitrogen are compressed, pre-cooled and purified, and are cooled after heat exchange, the product nitrogen meeting the requirements of ammonia synthesis is introduced into the main heat exchanger to provide the required cold energy for hydrogen, after the cold energy is recovered, is introduced into a nitrogen compressor, is compressed to meet the pressure requirements of ammonia synthesis, and is mixed with hydrogen at the required proportion and is sent into the ammonia sub-system.

[0042] When there is no renewable energy or renewable new energy,

[0043] The synthetic ammonia raw material supply process route is as follows: hydrogen: high-pressure low-temperature hydrogen released by the hydrogen storage tank 24 enters the main heat exchanger 30 after throttling and pressure reduction, serves as an air refrigeration cold source, and after recovering cold energy, enters the ammonia synthesis unit as an ammonia synthesis raw material through a pipeline; nitrogen: after air compressed, purified and pre-cooled, low-temperature hydrogen from the high-pressure low-temperature hydrogen storage tank and waste gas and nitrogen returned from the rectification tower are heat-exchanged and cooled, then enter the rectification tower, and after rectification, product nitrogen meeting the requirements of ammonia synthesis enters the nitrogen compressor 16 after recovering cold energy through the main heat exchanger, is compressed to meet the pressure requirements of ammonia synthesis, and is mixed with hydrogen and sent to the ammonia production subsystem.

[0044] The composite device provided by the utility model provides raw gas for the ammonia production subsystem, and the advantages include:

[0045] (1) The deep-cooling air separation nitrogen production device of the utility model utilizes low-temperature hydrogen stored during the period of large wind and light generation as a cold source, can greatly improve the operation flexibility of traditional deep-cooling air separation nitrogen production, increases from 70-100% to 40-100%, and can well match the raw material load change requirements of the subsequent ammonia synthesis.

[0046] (2) The utility model adopts high-pressure low-temperature hydrogen storage, utilizes the cold energy of deep-cooling air separation nitrogen production to reduce the hydrogen storage temperature and improve the hydrogen storage density, has higher storage density and economy than traditional gaseous hydrogen storage, and has higher economy and lower unit energy consumption of hydrogen storage than low-temperature liquid hydrogen storage.

[0047] (3) The utility model adopts a deep-cooling air separation nitrogen production and high-pressure low-temperature hydrogen storage combined device, the overall operation flexibility can be improved by 42%, and raw material support is provided for the flexible and stable operation of new energy ammonia production.

[0048] (4) The excess electric energy during the period of large wind and light generation is fully utilized to prepare cold energy through a refrigeration system to cool hydrogen storage, when there is no wind and light or the wind and light generation is relatively small, the stored low-temperature hydrogen is released, heat-exchanged to provide the required cold energy for the deep-cooling nitrogen production system, can achieve the effect of energy storage, and can provide qualified hydrogen and nitrogen gas raw materials for subsequent ammonia synthesis.

[0049] The utility model also provides a flexible green ammonia synthesis system, which comprises a composite device for providing raw gas and an ammonia production subsystem, the raw gas comprises hydrogen and nitrogen, and the composite device for providing raw gas is the composite device described above.

[0050] Preferably, the first hydrogen delivery pipeline of the hydrogen supply subsystem is in communication with the hydrogen inlet of the ammonia production subsystem and / or the third hydrogen delivery pipeline of the hydrogen supply subsystem is in communication with the hydrogen inlet of the ammonia production subsystem, and the gas outlet of the nitrogen compressor of the cryogenic air separation nitrogen production subsystem is in communication with the nitrogen inlet of the ammonia production subsystem.

[0051] Specifically, when renewable new energy is large, the first hydrogen delivery pipeline of the hydrogen supply subsystem is in communication with the hydrogen inlet of the ammonia production subsystem, at which time the excess hydrogen enters the high-pressure low-temperature hydrogen storage tank for storage; when renewable new energy is small, the first hydrogen delivery pipeline of the hydrogen supply subsystem is in communication with the hydrogen inlet of the ammonia production subsystem and the third hydrogen delivery pipeline of the hydrogen supply subsystem is in communication with the hydrogen inlet of the ammonia production subsystem, at which time part of the hydrogen needs to be released from the hydrogen storage tank to maintain stable operation of the hydrogen supply; when there is no renewable new energy, the third hydrogen delivery pipeline of the hydrogen supply subsystem is in communication with the hydrogen inlet of the ammonia production subsystem, at which time the source of hydrogen is entirely from the hydrogen storage tank.

[0052] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be deemed to limit the specific implementation of the present application to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the concept of the present application, a number of simple deductions and substitutions can be made, which should all be deemed to fall within the protection scope of the present application.

Claims

1. A composite device for providing raw gas for producing green ammonia from new energy, wherein the raw gas includes hydrogen and nitrogen, characterized in that: The composite device includes a cryogenic air separation nitrogen production subsystem, a hydrogen supply subsystem, and a main heat exchanger for heat exchange between the cryogenic air separation nitrogen production subsystem and the hydrogen supply subsystem, wherein: The hydrogen supply subsystem includes a water electrolysis hydrogen production unit, a first hydrogen compressor and a second hydrogen compressor, a hydrogen storage tank connected to the main heat exchanger, and a hydrogen delivery pipeline connected in sequence. The hydrogen delivery pipeline includes a first hydrogen delivery pipeline and a second hydrogen delivery pipeline arranged in parallel and both connected to the outlet of the first hydrogen compressor, and a third hydrogen delivery pipeline connected to the main heat exchanger. The second hydrogen delivery pipeline and the third hydrogen delivery pipeline are used to be connected to the hydrogen inlet of the ammonia production subsystem; The main heat exchanger is a multi-channel heat exchanger, including a first flow channel for the flow of a first medium and a second flow channel for the flow of a second medium. The medium inlet of the first flow channel is connected to the outlet of the second hydrogen compressor, and the medium outlet of the first flow channel is connected to the inlet of the hydrogen storage tank; the medium inlet of the second flow channel is connected to the outlet of the hydrogen storage tank, and the medium outlet of the second flow channel is connected to the third hydrogen delivery pipeline.

2. The composite device according to claim 1, characterized in that The hydrogen storage tank is a high-pressure and low-temperature hydrogen storage tank, and the main heat exchanger is a plate heat exchanger.

3. The composite device according to claim 1, characterized in that The hydrogen delivery pipeline further includes a first valve installed on the first hydrogen delivery pipeline and a second valve installed on the second hydrogen delivery pipeline.

4. The composite device according to claim 3, characterized in that The power supply of the water electrolysis hydrogen production unit is provided by renewable energy. When the renewable energy is in high production, the first valve and the second valve are both opened. When there is no renewable energy or the renewable energy is in low production, the second valve is closed.

5. The composite device according to claim 1, characterized in that The hydrogen delivery pipeline further includes a connecting pipeline, one end of which is connected to the outlet of the first hydrogen compressor and the other end of which is connected to the first hydrogen delivery pipeline and the second hydrogen delivery pipeline respectively.

6. The composite device according to any one of claims 1 to 5, characterized in that The cryogenic air separation nitrogen production subsystem comprises an air filter, an air compressor, an air precooler, an air purifier, a distillation tower, and a nitrogen compressor connected in sequence, wherein the gas outlet of the nitrogen compressor is used to be connected to the nitrogen inlet of the ammonia production subsystem; The main heat exchanger further includes a third flow channel for flowing a third medium and a fourth flow channel for flowing a fourth medium, wherein the medium inlet of the third flow channel is connected to the gas outlet of the air purifier, the medium outlet of the third flow channel is connected to the air inlet of the distillation tower, the medium inlet of the fourth flow channel is connected to the nitrogen outlet of the distillation tower, and the medium outlet of the fourth flow channel is connected to the air inlet of the nitrogen compressor.

7. The composite device according to claim 6, characterized in that The cryogenic air separation nitrogen production subsystem further includes an expander for providing a cold source.

8. The composite device according to claim 7, characterized in that The main heat exchanger further includes a fifth flow channel for the flow of a fifth medium, a medium inlet of the fifth flow channel is connected to the outlet of the expander, and a medium outlet of the fifth flow channel is connected to the inlet of the expander.

9. A flexible green ammonia synthesis system, characterized in that: The flexible green ammonia synthesis system includes a composite device for providing raw gas and an ammonia production subsystem. The raw gas includes hydrogen and nitrogen. The composite device for providing raw gas is the composite device according to any one of claims 1 to 8.

10. The flexible green ammonia synthesis system according to claim 9, characterized in that: The first hydrogen delivery pipeline of the hydrogen supply subsystem is connected to the hydrogen inlet of the ammonia production subsystem and / or the third hydrogen delivery pipeline of the hydrogen supply subsystem is connected to the hydrogen inlet of the ammonia production subsystem, and the outlet of the nitrogen compressor of the cryogenic air separation nitrogen production subsystem is connected to the nitrogen inlet of the ammonia production subsystem.

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