CN116216743A - Hydrogen production and ammonia synthesis coupling device system and method - Google Patents
Hydrogen production and ammonia synthesis coupling device system and method Download PDFInfo
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- CN116216743A CN116216743A CN202310153172.1A CN202310153172A CN116216743A CN 116216743 A CN116216743 A CN 116216743A CN 202310153172 A CN202310153172 A CN 202310153172A CN 116216743 A CN116216743 A CN 116216743A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/04—Preparation of ammonia by synthesis in the gas phase
- C01C1/0405—Preparation of ammonia by synthesis in the gas phase from N2 and H2 in presence of a catalyst
- C01C1/0488—Processes integrated with preparations of other compounds, e.g. methanol, urea or with processes for power generation
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- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/04—Preparation of ammonia by synthesis in the gas phase
- C01C1/0405—Preparation of ammonia by synthesis in the gas phase from N2 and H2 in presence of a catalyst
- C01C1/0476—Purge gas treatment, e.g. for removal of inert gases or recovery of H2
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
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- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
- C25B15/081—Supplying products to non-electrochemical reactors that are combined with the electrochemical cell, e.g. Sabatier reactor
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
- C25B15/083—Separating products
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
- C25B15/085—Removing impurities
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Abstract
The invention provides a device system and a method for coupling hydrogen production and synthesis ammonia, wherein the device system comprises a hydrogen purification unit and a synthesis ammonia unit which are sequentially connected; a recycle gas transfer unit is coupled between the hydrogen purification unit and the synthetic ammonia unit; the cycle gas transfer unit includes a hot cycle gas transfer module and/or a cold cycle gas transfer module. The method comprises the following steps: and transferring the circulating gas generated in the ammonia synthesis link to a hydrogen purification link to serve as regenerated gas. The device system provided by the invention has the advantages that the hydrogen production process and the ammonia synthesis process are deeply coupled, the device energy consumption of the system is reduced, the energy loss of the system is reduced, and the large-scale popularization and application are facilitated.
Description
Technical Field
The invention belongs to the technical field of green chemical industry, relates to a hydrogen production and synthesis ammonia coupling device system, and particularly relates to a hydrogen production and synthesis ammonia coupling device system and method.
Background
In recent years, hydrogen energy gradually becomes a current research hot spot due to the advantages of high heat value, zero emission, no pollution, wide application and the like. However, hydrogen has a problem of difficult storage and transportation due to its low density and high risk. Ammonia is one of the most basic raw materials for modern chemical and agricultural production, is relatively easy to store and transport, and is generally produced by adopting a synthetic reaction of hydrogen and nitrogen. Therefore, the synthesis of ammonia by utilizing hydrogen is one of the effective methods for solving the difficult problem of hydrogen energy storage and transportation.
In this way, some technicians combine the water electrolysis hydrogen production technology and the ammonia synthesis technology and couple clean energy to generate electricity, and the hydrogen energy is stored and transported in the form of liquid ammonia while the zero-carbon emission hydrogen production is realized, so that the problem of difficult storage and transportation of the hydrogen energy is effectively solved.
However, although the technology combines the hydrogen production and the ammonia synthesis process to convert the hydrogen into ammonia, the ammonia is synthesized by taking the hydrogen produced by the hydrogen production system as raw material gas, and the two processes and the two systems are not further coupled and optimized, so that the device energy consumption of the hydrogen production ammonia synthesis system is high and energy loss exists.
Therefore, how to provide a device system and a method for coupling hydrogen production and synthetic ammonia, and realize the deep coupling of the hydrogen production process and the synthetic ammonia process, thereby reducing the device energy consumption of the system and the energy loss of the system, and becoming the urgent problem to be solved by the current technicians in the field.
Disclosure of Invention
The invention aims to provide a device system and a method for coupling hydrogen production and synthetic ammonia, wherein the device system deeply couples the hydrogen production process and the synthetic ammonia process, reduces the device energy consumption of the system, reduces the energy loss of the system and is beneficial to large-scale popularization and application.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a hydrogen production and synthesis ammonia coupled plant system comprising a hydrogen purification unit and a synthesis ammonia unit.
A recycle gas transfer unit is coupled between the hydrogen purification unit and the ammonia synthesis unit.
The cycle gas transfer unit includes a hot cycle gas transfer module and/or a cold cycle gas transfer module.
The device system provided by the invention is coupled with the circulating gas transfer unit between the hydrogen purification unit and the synthetic ammonia unit so as to transfer the circulating gas generated in the synthetic ammonia link to the hydrogen purification link to serve as regenerated gas, thereby fully utilizing the heat and/or cold of the circulating 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, the device system provided by the invention can solve the problem of insufficient regenerated gas under variable power due to sufficient gas quantity of the circulating gas, and is particularly suitable for coupling the renewable energy source hydrogen production and the synthetic ammonia with large fluctuation of output power, thereby ensuring the normal operation of a hydrogen purification link under a full power section, improving the system efficiency of the hydrogen production and the synthetic ammonia, prolonging the service life of equipment and being beneficial to large-scale popularization and application.
Preferably, the hydrogen purification unit comprises a drying column.
Preferably, the recycle gas transfer unit is coupled between the drying column and the synthesis ammonia unit.
Preferably, the thermal cycle gas transfer assembly is used to transfer part/all of the thermal cycle gas into the drying column as thermal regeneration gas.
Preferably, the thermal recycle gas is recycle gas obtained after heat exchange between synthesis ammonia reaction raw material gas and synthesis ammonia reaction products.
Preferably, the cold recycle gas transfer assembly is for transferring part/all of the cold recycle gas into the drying column as cold recycle gas.
Preferably, the cold recycle gas is recycle gas obtained after gas-liquid separation of synthetic ammonia reaction products.
Preferably, the synthesis ammonia reaction feed gas comprises nitrogen and hydrogen output from the hydrogen purification unit.
Preferably, the synthesis ammonia reaction feed gas further comprises a hot recycle gas and/or a cold recycle gas.
Preferably, the synthesis ammonia unit comprises a reaction gas-recycle gas heat exchanger and an ammonia gas-liquid separator.
Preferably, the thermal cycle gas transfer assembly is disposed between the drying tower and the reactant gas-cycle gas heat exchanger.
Preferably, the cold cycle gas transfer assembly is disposed between the drying column and the ammonia gas-liquid separator.
Preferably, the device system further comprises a renewable energy source power supply unit for providing the device system with the required electrical energy.
In the present invention, the electric energy source of the renewable energy source electric power supply unit includes any one or a combination of at least two of wind power generation, photovoltaic power generation or hydroelectric power generation.
In a second aspect, the present invention provides a method of producing hydrogen and synthesizing ammonia using the apparatus system of the first aspect, the method comprising: and transferring the circulating gas generated in the ammonia synthesis link to a hydrogen purification link to serve as regenerated gas, wherein the circulating gas comprises hot circulating gas and/or cold circulating gas.
According to the method provided by the invention, the hot circulating gas and/or the cold circulating gas generated in the ammonia synthesis link are directly used as the regenerated gas in the hydrogen purification link, an additional heat exchange process is not needed, and the energy utilization rate is higher.
Preferably, part/all of the thermal cycle gas is transferred as a thermal regeneration gas to a drying tower of a hydrogen purification link.
Preferably, part/all of the cold recycle gas is transferred as cold regeneration gas to the drying tower of the hydrogen purification link.
Preferably, the amount of the thermal cycle gas transferred to the drying tower of the hydrogen purification link is 30% of the hydrogen production at full power of the device system.
Preferably, the amount of cold recycle gas transferred to the drying column of the hydrogen purification section is 30% of the hydrogen production at full capacity of the plant system.
The above 30% is only a preferable value, not limited thereto, but may be other values, and those skilled in the art can set the values as needed according to the actual situation.
Preferably, the hot recycle gas and/or the cold recycle gas flow through the drying tower and then are used as raw material gas for synthesizing ammonia.
Compared with the prior art, the invention has the following beneficial effects:
(1) The device system provided by the invention is coupled with the circulating gas transfer unit between the hydrogen purification unit and the synthetic ammonia unit so as to transfer the circulating gas generated in the synthetic ammonia link to the hydrogen purification link to serve as regenerated gas, thereby fully utilizing the heat and/or cold of the circulating 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, the device system provided by the invention can solve the problem of insufficient regenerated gas under variable power due to sufficient gas quantity of the circulating gas, and is particularly suitable for coupling the renewable energy source hydrogen production and the synthetic ammonia with large fluctuation of output power, thereby ensuring the normal operation of a hydrogen purification link under a full power section, improving the system efficiency of the hydrogen production and the synthetic ammonia, prolonging the service life of equipment and being beneficial to large-scale popularization and application;
(2) According to the method provided by the invention, the hot circulating gas and/or the cold circulating gas generated in the ammonia synthesis link are directly used as the regenerated gas in the hydrogen purification link, an additional heat exchange process is not needed, and the energy utilization rate is higher.
Drawings
FIG. 1 is a schematic diagram of a system of devices for coupling hydrogen production with ammonia synthesis provided by the present invention;
FIG. 2 is a flow chart of a method for coupling hydrogen production with ammonia synthesis by the plant system provided by the present invention;
FIG. 3 is a schematic diagram of the system of the apparatus for coupling hydrogen production with ammonia synthesis provided in example 3;
FIG. 4 is a schematic diagram of the system of apparatus for coupling hydrogen production with ammonia synthesis provided in example 4.
Wherein: 1-a power supply; 2-an electrolytic cell; 3-a gas-liquid separator; 4-a drying tower; a 5-ammonia synthesis gas compressor; a 6-ammonia synthesizer; 7-ammonia gas-liquid separator.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
The invention provides a device system for coupling hydrogen production and synthesis ammonia, which is shown in fig. 1, and comprises a hydrogen purification unit and a synthesis ammonia unit, wherein a circulating gas transfer unit is coupled between the hydrogen purification unit and the synthesis ammonia unit, and comprises a hot circulating gas transfer component and/or a cold circulating gas transfer component. The plant system also includes a hydrogen production unit that provides hydrogen to the hydrogen purification unit.
Specifically, the hydrogen production unit comprises an electrolytic tank 2 and a gas-liquid separator 3 which are connected in sequence; the hydrogen purification unit comprises a drying tower 4; the synthesis ammonia unit comprises 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 which are connected in sequence. And a circulating gas transfer unit is coupled between the drying tower and the synthetic ammonia unit.
In the invention, the thermal cycle gas transfer component is used for transferring part/all of the thermal cycle gas into the drying tower 4 to be used as thermal regeneration gas, and the thermal cycle gas is the cycle gas obtained after the heat exchange of the synthesis ammonia reaction raw material gas and the synthesis ammonia reaction product; the cold circulating gas transferring component is used for transferring part/all of the cold circulating gas into the drying tower 4 to be used as cold regenerated gas, and the cold circulating gas is the circulating gas obtained after gas-liquid separation of the synthetic ammonia reaction product. Wherein, the synthesis ammonia reaction raw material gas comprises nitrogen and hydrogen output by the hydrogen purification unit, and can further comprise hot recycle gas and/or cold recycle gas.
Further, the hot recycle gas transfer module is disposed between the drying tower 4 and the reaction gas-recycle gas heat exchanger (not shown in the drawing), and the cold recycle gas transfer module is disposed between the drying tower 4 and the ammonia gas-liquid separator 7.
The device system further comprises a renewable energy source power supply unit for supplying the required electric energy to the device system, the power source 1 shown in fig. 1 can be a renewable energy source power supply unit, and the electric energy source of the renewable energy source power supply unit can be wind power generation, photovoltaic power generation or a combination thereof.
Therefore, the device system provided by the invention is coupled with the circulating gas transfer unit between the hydrogen purification unit and the synthetic ammonia unit so as to transfer the circulating gas generated in the synthetic ammonia link to the hydrogen purification link to serve as regenerated gas, so that the heat and/or cold of the circulating gas are fully utilized, the device energy consumption of the system is reduced, the energy loss of the system is reduced, and the energy utilization rate of the system is improved. In addition, the device system provided by the invention can solve the problem of insufficient regenerated gas under variable power due to sufficient gas quantity of the circulating gas, and is particularly suitable for coupling the renewable energy source hydrogen production and the synthetic ammonia with large fluctuation of output power, thereby ensuring the normal operation of a hydrogen purification link under a full power section, improving the system efficiency of the hydrogen production and the synthetic ammonia, prolonging the service life of equipment and being beneficial to large-scale popularization and application.
The invention also provides a method for coupling hydrogen production and synthesis ammonia by adopting the device system, as shown in fig. 2, comprising the following steps: and transferring the circulating gas generated in the ammonia synthesis link to a hydrogen purification link to serve as regenerated gas, wherein the circulating gas comprises hot circulating gas and/or cold circulating gas.
Specifically, part/all of the thermal cycle gas is transferred to a drying tower 4 in a hydrogen purification link as thermal regeneration gas, so as to be used for heating regeneration of the drying tower 4, and the gas quantity of the thermal cycle gas transferred to the drying tower 4 is 30% of the hydrogen production under the full power of the device system during partial transfer; part/all of the cold recycle gas is transferred to the drying tower 4 in the hydrogen purification link as cold recycle gas for cold tower treatment of the drying tower 4, and the amount 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 during partial transfer. The hot circulation gas and/or the cold circulation gas flows through the drying tower 4 and then is used as raw material gas for synthesizing ammonia to carry out synthesis ammonia reaction.
According to the method, the hot recycle gas and/or the cold recycle gas generated in the synthetic ammonia link are directly used as the regeneration gas in the hydrogen purification link, an additional heat exchange process is not needed, and the energy utilization rate is higher.
Example 1
The embodiment provides a device system for coupling hydrogen production and ammonia synthesis, as shown in fig. 1, the device system comprises a power supply 1, a hydrogen production unit, a hydrogen purification unit and an ammonia synthesis unit which are sequentially connected, a circulating gas transfer unit is coupled between the hydrogen purification unit and the ammonia synthesis unit, and the circulating gas transfer unit comprises a hot circulating gas transfer assembly and a cold circulating gas transfer assembly.
Specifically, the hydrogen production unit comprises an electrolytic tank 2 and a gas-liquid separator 3 which are connected in sequence; the hydrogen purification unit comprises a drying tower 4; the synthesis ammonia unit comprises 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 which are connected in sequence.
In this embodiment, the thermal cycle gas transfer component is configured to transfer all the thermal cycle gas into the drying tower 4 to be used as a thermal regeneration gas, where the thermal cycle gas is a cycle gas obtained after heat exchange between a synthesis ammonia reaction raw material gas and a synthesis ammonia reaction product; the cold circulating gas transfer component is used for transferring all cold circulating gas into the drying tower 4 to be used as cold regenerated gas, and the cold circulating gas is the circulating gas obtained after gas-liquid separation of synthetic ammonia reaction products. Wherein, the synthesis ammonia reaction raw material gas comprises nitrogen, hydrogen output by the hydrogen purification unit, the hot recycle gas and the cold recycle gas.
Further, the hot recycle gas transfer module is disposed between the drying tower 4 and the reaction gas-recycle gas heat exchanger (not shown in the drawing), and the cold recycle gas transfer module is disposed between the drying tower 4 and the ammonia gas-liquid separator 7.
The recycle gas produced in the ammonia synthesis loop can be transferred to the hydrogen purification loop as a regeneration gas using the apparatus system provided in example 1, and the recycle gas includes a hot recycle gas and a cold recycle gas. All the hot recycle gas is used as hot regeneration gas to be transferred to a drying tower 4 in a hydrogen purification link so as to be used for heating and regenerating the drying tower 4; all of the cold recycle gas is transferred as cold recycle gas to the drying tower 4 of the hydrogen purification section for cold tower treatment of the drying tower 4. The hot circulating gas and the cold circulating gas flow are used as raw material gas of a synthetic ammonia link to carry out synthetic ammonia reaction after passing through a drying tower 4.
Example 2
The embodiment provides a device system for coupling hydrogen production and ammonia synthesis, as shown in fig. 1, the device system comprises a power supply 1, a hydrogen production unit, a hydrogen purification unit and an ammonia synthesis unit which are sequentially connected, a circulating gas transfer unit is coupled between the hydrogen purification unit and the ammonia synthesis unit, and the circulating gas transfer unit comprises a hot circulating gas transfer assembly and a cold circulating gas transfer assembly.
Specifically, the hydrogen production unit comprises an electrolytic tank 2 and a gas-liquid separator 3 which are connected in sequence; the hydrogen purification unit comprises a drying tower 4; the synthesis ammonia unit comprises 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 which are connected in sequence.
In this embodiment, the thermal cycle gas transfer component is configured to transfer a part of thermal cycle gas into the drying tower 4 as thermal regeneration gas, where the thermal cycle gas is cycle gas obtained after heat exchange between synthesis ammonia reaction raw material gas and synthesis ammonia reaction product, and the amount of the thermal cycle gas transferred into the drying tower 4 is 30% of the hydrogen yield under full power of the device system; the cold circulating gas transfer component is used for transferring part of cold circulating gas into the drying tower 4 to serve as cold regenerated gas, the cold circulating gas is circulating gas obtained after gas-liquid separation of synthetic ammonia reaction products, and the gas quantity of the cold circulating gas transferred into the drying tower 4 is 30% of the hydrogen production quantity under the full power of the device system. Wherein, the synthesis ammonia reaction raw material gas comprises nitrogen, hydrogen output by the hydrogen purification unit, the hot recycle gas and the cold recycle gas.
Further, the hot recycle gas transfer module is disposed between the drying tower 4 and the reaction gas-recycle gas heat exchanger (not shown in the drawing), and the cold recycle gas transfer module is disposed between the drying tower 4 and the ammonia gas-liquid separator 7.
Part of the recycle gas generated in the ammonia synthesis section can be transferred to the hydrogen purification section as regeneration gas by using the apparatus system provided in example 1, and the recycle gas includes hot recycle gas and cold recycle gas. Wherein the amounts of the hot recycle gas and the cold recycle gas transferred into the drying tower 4 are respectively and independently 30% of the hydrogen production amount under the full power of the device system. The hot circulating gas and the cold circulating gas flow are used as raw material gas of a synthetic ammonia link to carry out synthetic ammonia reaction after passing through a drying tower 4.
Example 3
The embodiment provides a device system for coupling hydrogen production and ammonia synthesis, as shown in fig. 3, the device system comprises a power supply 1, a hydrogen production unit, a hydrogen purification unit and an ammonia synthesis unit which are sequentially connected, a circulating gas transfer unit is coupled between the hydrogen purification unit and the ammonia synthesis unit, and the circulating gas transfer unit comprises a thermal circulating gas transfer assembly.
Specifically, the hydrogen production unit comprises an electrolytic tank 2 and a gas-liquid separator 3 which are connected in sequence; the hydrogen purification unit comprises a drying tower 4; the synthesis ammonia unit comprises 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 which are connected in sequence.
In this embodiment, the thermal cycle gas transfer component is configured to transfer all the thermal cycle gas into the drying tower 4 as the thermal regeneration gas, where the thermal cycle gas is a cycle gas obtained after heat exchange between the synthesis ammonia reaction raw material gas and the synthesis ammonia reaction product. Wherein, the synthesis ammonia reaction raw material gas comprises nitrogen, hydrogen output by the hydrogen purification unit and the thermal cycle gas.
In addition, the heat cycle gas transfer assembly is disposed between the drying tower 4 and the reactant gas-recycle gas heat exchanger (not shown in the drawing).
The thermal cycle gas generated in the ammonia synthesis stage can be transferred to the hydrogen purification stage as regeneration gas by using the apparatus system provided in example 1. All of the thermal circulating gas is transferred to a drying tower 4 of a hydrogen purification link as thermal regeneration gas for heating regeneration of the drying tower 4, and the thermal circulating gas is used as raw material gas of a synthesis ammonia link for synthesis ammonia reaction after passing through the drying tower 4.
Example 4
The embodiment provides a device system for coupling hydrogen production and ammonia synthesis, as shown in fig. 4, the device system comprises a power supply 1, a hydrogen production unit, a hydrogen purification unit and an ammonia synthesis unit which are sequentially connected, a circulating gas transfer unit is coupled between the hydrogen purification unit and the ammonia synthesis unit, and the circulating gas transfer unit comprises a cold circulating gas transfer assembly.
Specifically, the hydrogen production unit comprises an electrolytic tank 2 and a gas-liquid separator 3 which are connected in sequence; the hydrogen purification unit comprises a drying tower 4; the synthesis ammonia unit comprises 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 which are connected in sequence.
In this embodiment, the cold recycle gas transfer component is configured to transfer all the cold recycle gas into the drying tower 4 as cold regenerated gas, where the cold recycle gas is a recycle gas obtained by gas-liquid separation of a synthetic ammonia reaction product. The synthesis ammonia reaction feed gas comprises nitrogen, hydrogen output by the hydrogen purification unit and the cold recycle gas.
Further, the cold cycle gas transfer assembly is disposed between the drying tower 4 and the ammonia gas-liquid separator 7.
The cold recycle gas produced in the ammonia synthesis stage can be transferred to the hydrogen purification stage as regeneration gas using the apparatus system provided in example 1. All of the cold recycle gas is transferred to the drying tower 4 in the hydrogen purification link as cold recycle gas for the cold tower treatment of the drying tower 4, and the cold recycle gas is used as raw material gas in the synthesis ammonia link for the synthesis ammonia reaction after passing through the drying tower 4.
Therefore, the device system provided by the invention is coupled with the circulating gas transfer unit between the hydrogen purification unit and the synthetic ammonia unit so as to transfer the circulating gas generated in the synthetic ammonia link to the hydrogen purification link to serve as regenerated gas, so that the heat and/or cold of the circulating gas are fully utilized, the device energy consumption of the system is reduced, the energy loss of the system is reduced, and the energy utilization rate of the system is improved. In addition, the device system provided by the invention can solve the problem of insufficient regenerated gas under variable power due to sufficient gas quantity of the circulating gas, and is particularly suitable for coupling the renewable energy source hydrogen production and the synthetic ammonia with large fluctuation of output power, thereby ensuring the normal operation of a hydrogen purification link under a full power section, improving the system efficiency of the hydrogen production and the synthetic ammonia, prolonging the service life of equipment and being beneficial to large-scale popularization and application.
In addition, the method provided by the invention directly utilizes the hot recycle gas and/or the cold recycle gas generated in the ammonia synthesis link as the regeneration gas in the hydrogen purification link, does not need an additional heat exchange process, and has higher energy utilization rate.
The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.
Claims (12)
1. A system of devices for coupling hydrogen production with ammonia synthesis, the system of devices comprising a hydrogen purification unit and an ammonia synthesis unit;
a recycle gas transfer unit is coupled between the hydrogen purification unit and the synthetic ammonia unit;
the cycle gas transfer unit includes a hot cycle gas transfer module and/or a cold cycle gas transfer module.
2. The plant system according to claim 1, wherein the hydrogen purification unit comprises a drying column;
the circulating gas transfer unit is coupled between the drying tower and the synthetic ammonia unit.
3. The plant system according to claim 2, wherein the thermal cycle gas transfer assembly is configured to transfer part/all of the thermal cycle gas into the drying column as thermal regeneration gas;
the thermal circulating gas is the circulating gas obtained after heat exchange between the synthesis ammonia reaction raw material gas and the synthesis ammonia reaction product.
4. The plant system according to claim 2, wherein the cold cycle gas shift assembly is configured to shift part/all of the cold cycle gas into the drying column as cold regeneration gas;
the cold circulating gas is obtained by gas-liquid separation of synthetic ammonia reaction products.
5. The plant system of claim 3 or 4, wherein the synthesis ammonia reaction feed gas comprises nitrogen and hydrogen output from the hydrogen purification unit.
6. The plant system of claim 5, wherein the synthesis ammonia reaction feed gas further comprises a hot recycle gas and/or a cold recycle gas.
7. The plant system of claim 2, wherein the synthesis ammonia unit comprises a reactant gas-recycle gas heat exchanger and an ammonia gas-liquid separator;
the thermal cycle gas transfer assembly is arranged between the drying tower and the reaction gas-cycle gas heat exchanger;
the cold circulation gas transfer assembly is arranged between the drying tower and the ammonia gas-liquid separator.
8. The device system of claim 1, further comprising a renewable energy source power supply unit for providing the device system with the required electrical energy.
9. A method of producing hydrogen and synthesizing ammonia using the apparatus system of any one of claims 1-8, the method comprising: and transferring the circulating gas generated in the ammonia synthesis link to a hydrogen purification link to serve as regenerated gas, wherein the circulating gas comprises hot circulating gas and/or cold circulating gas.
10. The method according to claim 9, wherein part/all of the hot recycle gas is transferred as hot recycle gas to the drying column of the hydrogen purification section;
part/all of the cold recycle gas is used as cold regeneration gas to be transferred to a drying tower of a hydrogen purification link.
11. The method of claim 10, wherein the amount of the hot recycle gas transferred to the drying column of the hydrogen purification section is 30% of the hydrogen production at full capacity of the plant system;
the amount of cold recycle gas transferred to the drying tower in the hydrogen purification link is 30% of the hydrogen yield under the full power of the device system.
12. The method according to claim 9, wherein the hot recycle gas and/or the cold recycle gas is used as a feed gas for the synthesis ammonia after passing through the drying tower.
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| CN202310153172.1A CN116216743A (en) | 2023-02-17 | 2023-02-17 | Hydrogen production and ammonia synthesis coupling device system and method |
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| CN202310153172.1A CN116216743A (en) | 2023-02-17 | 2023-02-17 | Hydrogen production and ammonia synthesis coupling device system and method |
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