Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
  • F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
  • F25J3/0635—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of CnHm with 1 carbon atom or more
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
  • F25J3/0605—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the feed stream
  • F25J3/062—Refinery gas, cracking gas, coke oven gas, gaseous mixtures containing aliphatic unsaturated CnHm or gaseous mixtures of undefined nature
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
  • F25J3/0605—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the feed stream
  • F25J3/0625—H2/CO mixtures, i.e. synthesis gas; Water gas or shifted synthesis gas
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
  • F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
  • F25J3/064—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of CnHm with 2 carbon atoms or more
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
  • F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
  • F25J3/0655—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of hydrogen
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
  • F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
  • F25J3/066—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of nitrogen
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
  • F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
  • F25J3/0665—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of carbon monoxide
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J2205/00—Processes or apparatus using other separation and/or other processing means
  • F25J2205/40—Processes or apparatus using other separation and/or other processing means using hybrid system, i.e. combining cryogenic and non-cryogenic separation techniques
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J2205/00—Processes or apparatus using other separation and/or other processing means
  • F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J2205/00—Processes or apparatus using other separation and/or other processing means
  • F25J2205/80—Processes or apparatus using other separation and/or other processing means using membrane, i.e. including a permeation step
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J2210/00—Processes characterised by the type or other details of the feed stream
  • F25J2210/12—Refinery or petrochemical off-gas
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J2270/00—Refrigeration techniques used
  • F25J2270/04—Internal refrigeration with work-producing gas expansion loop

Definitions

• the present invention relates to a system for separating gas in a cryogenic environment.
• Hydrogen may be produced by various methods, but in particular, various methods for producing hydrogen from natural gas is being reviewed.
• methane pyrolysis technique is a technique that pyrolyzes methane in a high-temperature environment and directly decomposes the same into carbon black and hydrogen.
• unreacted methane remains during this process, and hydrocarbon (C x H y ) is generated as a byproduct, thereby requiring separation.
• steam methane reforming method is a method of producing hydrogen by adding steam to natural gas and carbon dioxide gas is generated, and carbon monoxide gas is generated as a byproduct, thereby requiring separation.
• ammonia is a mixture of nitrogen and hydrogen that may be produced through synthesis, and when nitrogen and hydrogen are separated again, high-purity hydrogen may be utilized, so that it has attracted attention as a technique for storing and transporting hydrogen. However, when extracting hydrogen again from ammonia, it is necessary to separate unreacted ammonia and nitrogen.
• a system for separating gas in a cryogenic environment including: a heat exchange unit cooling methane pyrolysis gas from which carbon black is removed, a steam methane reforming gas, and an ammonia decomposition gas to produce a cooling gas including liquefied hydrocarbon, liquefied carbon dioxide, and liquefied ammonia; a recovery unit connected to the heat exchange unit to receive the cooling gas from the heat exchange unit, and condensing the liquefied hydrocarbon, the liquefied carbon dioxide, and the liquefied ammonia included in the cooling gas to recover the liquefied hydrocarbon, the liquefied carbon dioxide, and the liquefied ammonia included in the cooling gas; a separation unit connected to the recovery unit, receiving a remaining gas from which the liquefied hydrocarbon, the liquefied carbon dioxide, and the liquefied ammonia is removed from the cooling gas, and separating a methane gas, a carbon monoxide gas,
• the separation unit may include a cryogenic separation device that receives the remaining gas and separates the remaining gas into the methane gas, the carbon monoxide gas, the nitrogen gas, and the hydrogen gas by diffusing the remaining gas through a separation membrane in the cryogenic environment, wherein the separation membrane may include a cryogenic separating membrane that increases a purity of the separated gas by increasing a selectivity of the remaining gas and reducing a diffusion speed of the remaining gas in the cryogenic environment rather than in a non-cryogenic environment.
• the cold heat supply unit may include a cold heat supply line of methane, carbon monoxide, and nitrogen that connects the cryogenic separation device and the heat exchange unit, and a cold heat production device of the methane, carbon monoxide, and nitrogen that is equipped on a cold heat line of the methane, carbon monoxide, and nitrogen, receives the methane, the carbon monoxide, and the nitrogen gas separated by the cryogenic separation device in the cryogenic environment to cool the same, and supplies the same to the heat exchange unit.
• cold heat of the methane, the carbon monoxide, and the nitrogen gas produced in the cold heat production device of the methane, carbon monoxide, and nitrogen may be transferred to the methane pyrolysis gas from which carbon black is removed, the steam methane reforming gas, and the ammonia decomposition gas that are supplied to the heat exchange unit.
• the separation unit may include a plurality of cryogenic adsorption devices that receive the remaining gas and separate the remaining gas into the nitrogen gas and the hydrogen gas using an adsorbent
• the adsorbent may include a cryogenic adsorbent that increases the purity of separated gas by increasing an adsorption amount of the remaining gas by improving an adsorption performance in the cryogenic environment rather than in the non-cryogenic environment.
• the cold heat supply unit may include a hydrogen cold heat supply line that connects the cryogenic adsorption device and the heat exchange unit, and a hydrogen cold heat production device that is equipped on the hydrogen cold heat supply line and receives the hydrogen gas separated by the cryogenic adsorption device in the cryogenic environment to cool the same, and supplies the same to the heat exchange unit.
• cold heat of the hydrogen gas produced in the hydrogen cold heat production device may be transferred to the methane pyrolysis gas from which carbon black is removed, the steam methane reforming gas, and the ammonia decomposition gas supplied to the heat exchange unit, and a storage unit that receives and stores the hydrogen gas after transferring the cold heat to the methane pyrolysis gas from which carbon black is removed, the steam methane reforming gas, and the ammonia decomposition gas may be further included.
• At least a part of the hydrogen gas after transferring the cold heat to the methane pyrolysis gas from which carbon black is removed, the steam methane reforming gas, and the ammonia decomposition gas stored in the storage unit may be selectively supplied to a plurality of the cryogenic adsorption devices to utilize for regenerating the adsorbent.
• a degassing unit that receives the adsorbed gas adsorbed in the plurality of cryogenic adsorption devices to degas the same may be further included.
• the adsorbed gas degassed in the degassing unit may supplied to the heat exchange unit, and cold heat of the adsorbed gas supplied to the heat exchange unit may be transferred to the methane pyrolysis gas from which carbon black is removed, the steam methane reforming gas, and the ammonia decomposition gas that are supplied to the heat exchange unit.
• a load of the separation unit can be reduced to increase a separation ability by recovering a specific gas by phase-changing, and system efficiency and economic feasibility can also be improved by selling the gas for a separate purpose or recirculating the gas into the system for utilization.
• the separation process can be simplified by maximizing the performance of the adsorbent through a cryogenic adsorption process in the cryogenic environment, thereby ensuring economic feasibility.
• a system 1 for separating gas in the cryogenic environment may include a heat exchange unit 10, a recovery unit 20, a separation unit 30, a cold heat supply unit 40, a storage unit 50, and a degassing unit 60.
• the heat exchange unit 10 may transfer a cold heat of a hydrogen gas discharged from a hydrogen cold heat production device 42 of the cold heat supply unit 40 to the methane pyrolysis gas from which carbon black is removed, the steam methane reforming gas, and the ammonia decomposition gas to cool the methane pyrolysis gas from which carbon black is removed, the steam methane reforming gas, and the ammonia decomposition gas.
• hydrocarbon in gaseous state, carbon dioxide, and ammonia included in the methane pyrolysis gas from which carbon black is removed, the steam methane reforming gas, and the ammonia decomposition gas may be cooled through the heat exchange unit 10 and to phase-change into a liquid or solid state.
• the rear temperature of the first-stage heat exchanger may be set to about 0°C, and a rear end temperature of the second-stage heat exchanger may be set to about - 100 °C.
• the recovery unit 20 may be equipped at a rear end of the first-stage heat exchanger.
• the recovery unit 20 is connected to the heat exchange unit 10 and receives the cooling gas from the heat exchange unit 10, and condenses the liquefied hydrocarbon, the liquefied carbon dioxide, and the liquefied ammonia included in the cooling gas to recover the liquefied hydrocarbon, the liquefied carbon dioxide, and the liquefied ammonia included in the cooling gas.
• the recovery unit 20 may separate the liquefied hydrocarbon, the liquefied carbon dioxide, and the liquefied ammonia from the cooling gas, and when the heat exchange unit 10 is equipped as the second-stage heat exchanger, the recovery unit 20 may separate the moisture from the liquefied hydrocarbon, the liquefied carbon dioxide, and the liquefied ammonia from the cooling gas separately.
• the recovery unit 20 may be equipped as an ammonia condensation tank including a structure that promotes condensation of the liquefied hydrocarbon, the liquefied carbon dioxide, and the liquefied ammonia, or a demister that removes moisture included in the cooling gas, etc. as an example.
• the separation unit 30 may include a plurality of cryogenic adsorption devices 31 that separate the remaining gas into the nitrogen gas and the hydrogen gas using an adsorbent.
• the adsorbent provided to the cryogenic adsorption device 31 may include a cryogenic adsorbent that has an increased adsorption performance in the cryogenic environment than in a non-cryogenic environment.
• the non-cryogenic environment may refer to an environment other than the cryogenic environment, for example, a room temperature/high pressure environment.
• the cryogenic adsorption device 31 may be miniaturized by maximizing the adsorption performance of the cryogenic adsorbent in the cryogenic environment compared to the related art.
• the cryogenic adsorbent may be composed of a material capable of adsorbing a specific gas such as a carbon molecular sieve, zeolite, or activated carbon.
• the cryogenic adsorbent may be composed of not only a solid-state adsorbent but also a liquid state such as DEPG, NMP, PZ, MDEA, and DIPA.
• cryogenic adsorption devices 31 may be operated to produce hydrogen, and a remainder of the plurality of cryogenic adsorption devices 31 may be operated to regenerate the adsorbent.
• the cryogenic adsorption device 31 may receive the remaining gas from the recovery unit 20, and when the cryogenic adsorption device 31 is operated for adsorbent regeneration, the cryogenic adsorption device 31 may receive hydrogen from the storage unit 50. This will be described later.
• the adsorbed gas adsorbed in the cryogenic adsorption process of the plurality of cryogenic adsorption devices 31 may be supplied to the degassing unit 60 to be degassed.
• the adsorbed gas degassed through the degassing unit 60 may be composed of the methane gas, the carbon monoxide gas, the nitrogen gas, and the hydrogen gas and may be supplied to the heat exchange unit 10 to be utilized as a cold heat source for cooling the ammonia decomposition gas. This will be described later.
• the plurality of cryogenic adsorption devices 31 may be operated sequentially in the cryogenic environment. In addition, the plurality of cryogenic adsorption devices 31 may be operated variably for hydrogen purity and hydrogen recovery rate according to quality requirements of the produced hydrogen.
• the cold heat supply unit 40 may include the hydrogen cold heat supply line 41 that connects the cryogenic adsorption device 32 and the heat exchange unit 10 and a hydrogen cold heat production device 42 that is equipped on the hydrogen cold heat supply line 41, receives the hydrogen gas separated in the cryogenic environment by the cryogenic adsorption device 31 to cool the same, and supplies the same to the heat exchange unit 10.
• the hydrogen cold heat production device 42 may be equipped as a means capable of cooling the hydrogen gas, for example, an expander or a freezer.
• the hydrogen gas may be cooled without using a separate energy source, and when the hydrogen cold heat production device 42 is equipped as the freezer, the hydrogen gas may be cooled while maintaining a pressure of the hydrogen gas.
• the cryogenic adsorption device 31 may be miniaturized compared to a case in which when the hydrogen cold heat production device 44 is equipped as the expander.
• the storage unit 50 may receive and store the hydrogen gas after transferring cold heat to the methane pyrolysis gas from which carbon black is removed, the steam methane reforming gas, and the ammonia decomposition gas.
• the hydrogen gas after transferring the cold heat to the methane pyrolysis gas from which carbon black is removed, the steam methane reforming gas, and the ammonia decomposition gas may be understood as a room temperature hydrogen gas.
• the storage unit 50 may be connected to the heat exchange unit 10, and as an example, may be equipped as a storage tank that stores the room temperature hydrogen gas.
• the room temperature hydrogen gas stored in the storage unit 50 may be supplied to the cryogenic adsorption device 31 to be utilized for regenerating the adsorbent in the cryogenic adsorption device 31.
• the degassing unit 60 may receive the adsorbed gas adsorbed in the plurality of cryogenic adsorption devices 31 to degas the same.
• the adsorbed gas may be composed of the methane gas, the carbon monoxide gas, the nitrogen gas, and the hydrogen gas and the degassing unit 60 may be equipped as a vacuum pump as an example.
• the adsorbed gas (hereinafter referred to as "degassed gas") degassed through the degassing unit 60 may be supplied to the heat exchange unit 10.
• the degassed gas supplied to the heat exchange unit 10 in this way may be utilized to cool the methane pyrolysis gas from which carbon black is removed, the steam methane reforming gas, and the ammonia decomposition gas that are supplied to the heat exchange unit 10.
• the separation process can be simplified by maximizing the performance of the adsorbent through a cryogenic adsorption process in the cryogenic environment, thereby ensuring economic feasibility.
• a system 1a for separating gas in a cryogenic environment may include a heat exchange unit 10, a recovery unit 20, a separation unit 30a, a cold heat supply unit 40a, and a storage unit 70.
• the system 1a for separating gas in the cryogenic environment shown in FIGS. 3 and 4 is substantially the same as the system 1 for separating gas in the cryogenic environment described with reference to FIGS.
• the separation unit 30a may be connected to the recovery unit 20, and receive remaining gas from which liquefied hydrocarbon, liquefied carbon dioxide, and liquefied ammonia is removed from the cooling gas, and separate the methane gas, the carbon monoxide gas, the nitrogen gas, and the hydrogen gas included in the remaining gas in the cryogenic environment.
• the separation unit 30a may include a cryogenic separation device 32 that separates the remaining gas into the methane gas, the carbon monoxide gas, the nitrogen gas, and the hydrogen gas by diffusing the remaining gas through a separation membrane in the cryogenic environment.
• the separation membrane provided in the cryogenic separation device 32 may be a cryogenic separating membrane that reduces a diffusion speed of the remaining gas in the cryogenic environment rather than in a non-cryogenic environment.
• the non-cryogenic environment may refer to an environment other than the cryogenic environment, for example, a room temperature/high pressure environment.
• a selectivity of the remaining gas passing through the cryogenic separation device 32 is increased, and the diffusion speed is reduced, thereby maximizing the performance of the separation membrane. Furthermore, separation efficiency of the nitrogen gas and the hydrogen gas may also be improved.
• the cold heat supply unit 40a may provide cold heat of the methane gas, the carbon monoxide gas, and the nitrogen gas that are separated by the separation unit 30a in the cryogenic environment to the heat exchange unit 10.
• the cold heat supply unit 40a may include a cold heat supply line 43 of methane, carbon monoxide, and nitrogen that connects the cryogenic separation device 32 and the heat exchange unit 10, and a cold heat production device 44 of the methane, carbon monoxide, and nitrogen that is equipped on a cold heat line 43 of the methane, carbon monoxide, and nitrogen, receives the methane gas, the carbon monoxide gas, and the nitrogen gas separated by the cryogenic separation device 32 in the cryogenic environment to cool the same, and supplies the same to the heat exchange unit 10.
• the nitrogen cold heat production device 44 may generate cold heat through kinetic energy of the methane gas, the carbon monoxide gas, and the nitrogen gas discharged from the cryogenic separation device 32.
• cold heat required for liquefaction of the hydrocarbon gas, the carbon dioxide gas, and the ammonia gas is produced only by the kinetic energy of the methane gas, the carbon monoxide gas, and the nitrogen gas without a separate energy source, thereby having high energy efficiency.
• the remaining gas supplied to the cold heat production device 44 of the methane, carbon monoxide, and nitrogen is composed only of the methane gas, the carbon monoxide gas, the nitrogen gas, and the hydrogen gas from which liquefiable gas has been removed, thereby increasing reliability of the process.
• the cold heat production device 44 of the methane, carbon monoxide, and nitrogen is the expander or the nozzle
• the cold heat production device 44 of the methane, carbon monoxide, and nitrogen may also be equipped as a freezer module capable of reducing temperature of the methane, the carbon monoxide, and the nitrogen gas discharged from the cryogenic separation device 32.
• the storage unit 70 may receive and store the hydrogen gas after transferring cold heat to the methane pyrolysis gas from which carbon black is removed, the steam methane reforming gas, and the ammonia decomposition gas.
• the methane pyrolysis gas from which carbon black is removed, the steam methane reforming gas, and the ammonia decomposition gas passing through the heat exchange unit 10 absorb the cold heat of a cryogenic hydrogen gas, a temperature of the cryogenic hydrogen gas may be increased to the room temperature.
• the hydrogen gas after transferring the cold heat to the ammonia decomposition gas may be understood as a room temperature hydrogen gas.
• the storage unit 70 may be connected to the heat exchange unit 10, and as an example, may be equipped as a storage tank that stores the room temperature hydrogen gas.
• the system 1a for separating gas in the cryogenic environment having the above-described configuration may reduce a load of the separation unit and increase a separation ability by recovering a specific gas by phase-changing, and system efficiency and economic feasibility may also be improved by selling the gas for a separate purpose or recirculating the gas into the system for utilization.
• a separation efficiency of the methane gas, the carbon monoxide gas, the nitrogen gas, and the hydrogen gas may be improved by reducing the diffusion speed of the remaining gas consisting of the methane gas, the carbon monoxide gas, the nitrogen gas, and the hydrogen gas through the cryogenic separation process in the cryogenic environment and increasing the selectivity.

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• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Separation By Low-Temperature Treatments (AREA)
• Hydrogen, Water And Hydrids (AREA)

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