US20200400371A1 - Cooling system - Google Patents
Cooling system Download PDFInfo
- Publication number
- US20200400371A1 US20200400371A1 US16/969,623 US201916969623A US2020400371A1 US 20200400371 A1 US20200400371 A1 US 20200400371A1 US 201916969623 A US201916969623 A US 201916969623A US 2020400371 A1 US2020400371 A1 US 2020400371A1
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- US
- United States
- Prior art keywords
- neon
- refrigerant
- helium
- raw mixture
- cooling system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- 238000001816 cooling Methods 0.000 title claims abstract description 62
- 239000000203 mixture Substances 0.000 claims abstract description 110
- 239000003507 refrigerant Substances 0.000 claims abstract description 77
- 238000005057 refrigeration Methods 0.000 claims abstract description 69
- 229910052754 neon Inorganic materials 0.000 claims abstract description 68
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000001307 helium Substances 0.000 claims abstract description 62
- 229910052734 helium Inorganic materials 0.000 claims abstract description 62
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 61
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000000926 separation method Methods 0.000 claims abstract description 34
- 239000001257 hydrogen Substances 0.000 claims abstract description 31
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 31
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 239000003570 air Substances 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 35
- 239000012080 ambient air Substances 0.000 claims description 14
- 238000000746 purification Methods 0.000 claims description 11
- 239000012535 impurity Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 5
- CPBQJMYROZQQJC-UHFFFAOYSA-N helium neon Chemical compound [He].[Ne] CPBQJMYROZQQJC-UHFFFAOYSA-N 0.000 description 23
- 238000003860 storage Methods 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 150000002431 hydrogen Chemical class 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002887 superconductor Substances 0.000 description 3
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Images
Classifications
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- 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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/006—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant containing more than one component
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
- C09K5/041—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
- C09K5/041—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems
- C09K5/042—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising compounds containing carbon and hydrogen only
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- 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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B40/00—Subcoolers, desuperheaters or superheaters
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- 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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0005—Light or noble gases
- F25J1/0007—Helium
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0005—Light or noble gases
- F25J1/001—Hydrogen
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
- F25J1/005—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by expansion of a gaseous refrigerant stream with extraction of work
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
- F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
- F25J1/0062—Light or noble gases, mixtures thereof
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
- F25J1/0062—Light or noble gases, mixtures thereof
- F25J1/0065—Helium
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0211—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
- F25J1/0212—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a single flow MCR cycle
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
- F25J1/0234—Integration with a cryogenic air separation unit
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0244—Operation; Control and regulation; Instrumentation
- F25J1/0245—Different modes, i.e. 'runs', of operation; Process control
- F25J1/0249—Controlling refrigerant inventory, i.e. composition or quantity
- F25J1/025—Details related to the refrigerant production or treatment, e.g. make-up supply from feed gas itself
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- 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
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
- F25J1/0262—Details of the cold heat exchange system
- F25J1/0264—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams
- F25J1/0265—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams comprising cores associated exclusively with the cooling of a refrigerant stream, e.g. for auto-refrigeration or economizer
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- 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
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04642—Recovering noble gases from air
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
- C09K2205/10—Components
- C09K2205/13—Inert gases
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- 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
- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/30—Helium
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- 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
- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/32—Neon
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- 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
- F25J2260/00—Coupling of processes or apparatus to other units; Integrated schemes
- F25J2260/02—Integration in an installation for exchanging heat, e.g. for waste heat recovery
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- 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
- F25J2260/00—Coupling of processes or apparatus to other units; Integrated schemes
- F25J2260/20—Integration in an installation for liquefying or solidifying a fluid stream
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- 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
- F25J2270/12—External refrigeration with liquid vaporising loop
Definitions
- the invention relates to a cooling system, preferably for use in or including a refrigeration plant and/or a liquefier plant, having a refrigeration circuit.
- the invention further relates to a method for producing a refrigerant usable in a refrigeration circuit.
- Refrigeration plants configured to achieve very low temperatures of 80 K or below, typically use hydrogen or helium as a refrigerant.
- An industrial hydrogen liquefaction plant is known from EP 3 163 236 A1, in which a hydrogen gas stream is cooled my means of a plurality of closed-loop cooling cycles to a temperature below a condensation point of hydrogen so as to provide a liquid hydrogen stream.
- Refrigeration plants adapted for temperatures below 80 K, usually apply a Brayton cycle or a Claude cycle with compression of the refrigerant at ambient temperature, heat exchange and refrigeration via expansion.
- the refrigerant is compressed via a screw type compressor, piston compressor or turbo-compressor.
- the turbo-compressor is favorable in view of efficiency, flow rate capacity and reliability.
- FIG. 1 illustrates the conventional process to provide a mixture including helium and neon as a refrigerant for a refrigeration and/or liquefaction plant.
- a first process line 100 includes an air separation plant 101 configured to separate ambient air into its component parts by cryogenic rectification.
- a neon rich stream produced from the air separation plant 101 is fed to a neon rectification column 102 to produce a second neon rich stream with a higher concentration of neon. This second neon rich stream is then purified and thereafter stored in a neon-storage 103 .
- Helium is obtained from a different plant via a second process line 110 which is locally separated from the first process line 100 .
- the helium is obtained and separated from natural gas, to which contains helium at a proportion of 1% or more, within a fractionating column 111 .
- Helium is extracted and accumulated within a subsequent process stage 112 and thereafter stored in a helium-storage 113 .
- the pure neon stored in the neon-storage 103 and the pure helium stored in the helium-storage 113 are mixed according to a desired ratio and supplied to a refrigeration plant 120 .
- Helium and neon, as well as mixtures thereof are rather expensive gases. Pure neon is considerably more expensive than helium and not available everywhere. Moreover, refrigeration systems are not completely leak-proof. Considerable quantities of the product may get lost especially during maintenance work. This implies substantial initial, operating and maintenance costs. Moreover, the technology and logistics are complicated. Helium is usually extracted from natural gas. Neon is separated from air by applying a complex process. Thus, both gases are usually extracted, transported and delivered separately and only subsequently mixed to be used in a refrigeration circuit or refrigeration plant.
- the mixture particularly the ratio of neon and helium, has to be monitored and adjusted, which additionally implies technical challenges and costs regarding the analysis and gas management system.
- a cooling system including a refrigeration circuit configured to use a refrigerant including a mixture of helium and neon; wherein the refrigerant is based on a raw mixture, preferably the refrigerant comprises the raw mixture, and wherein the raw mixture extracted from air by an air separation plant.
- the cooling system is preferably adapted for use in or including a refrigeration plant and/or a liquefiers.
- This for instance includes refrigeration plants for cooling high-temperature superconductors, precooling in refrigeration plants (e.g. shield cooling in particle accelerators) and liquefiers, particularly helium or hydrogen liquefiers, etc.
- the cooling system has a refrigeration circuit configured to use a refrigerant including a mixture of helium and neon.
- the mixture comprises helium, neon and hydrogen.
- the refrigerant is based on a raw mixture, preferably is the raw mixture, including helium and neon, extracted from air by an air separation plant.
- the cooling system has the air separation plant configured to extract from air the raw mixture including helium and neon. In other words, both components—helium and neon—are extracted from the air.
- the extraction is preferably done by the same process and/or simultaneously such that after the process the raw mixture is present without any further processing.
- the raw mixture to be used as the refrigerant is provided by extracting it as such from air but not by supplying it by mixing two or more gases which are provided in separate processes or extracted from different raw materials such as air and natural gas.
- the raw mixture including helium and neon is extracted from air in rectification columns of the (cryogenic) air separation plant.
- the air separation plant may be locally separated from the refrigeration circuit.
- the raw mixture may be extracted at any time and stored until usage.
- the raw mixture ex is directly used as the refrigerant or forms the basis of the refrigerant.
- the raw mixture including helium and neon (possibly as well as other components) is used as the refrigerant with or without further treatment, such as cleaning.
- the raw mixture including helium and neon is extracted from the air via the air separation plant. This helps solving the problem of availability and reduces technical complexity and costs as compared to the conventional processes for extracting helium and neon separately and subsequently mixing the two components.
- the logistics for obtaining the refrigerant is simplified since the desired raw mixture is provided via “one source”, i.e. air as the source not for the individual components but the raw mixture itself.
- the raw mixture further includes nitrogen and/or hydrogen.
- a certain amount of nitrogen and/or hydrogen is permitted depending on the intended cooling temperatures. Maintaining nitrogen and/or hydrogen in the raw mixture and preferably also in the refrigerant helps further reducing the technical complexity, because the extracted raw mixture may be used without further treatment, particularly without purification, for instance in an adsorber.
- Hydrogen which is present in ambient air in a concentration of usually 0.4 ppm, may be present in the raw mixture and/or refrigerant corresponding to the amount of 2% or below.
- the raw helium-neon mixture produced from the column(s) of the air separation plant (typically consisting of neon, nitrogen, helium and hydrogen) can directly be used without any further treatment in the refrigeration circuit preferably configured for cooling temperatures below 80 K to approximately 63 K (triple point of nitrogen).
- the cooling system further includes a purification device configured to remove impurities, to for example nitrogen, from the raw mixture.
- a purification device configured to remove impurities, to for example nitrogen, from the raw mixture.
- This provides a refrigerant suitable for lower cooling temperatures such as below 80 K, preferably below 70 K, to approximately 25 K.
- Impurities in this connotation are to be understood to refer to the components not desired in a refrigerant for a particular application but which are inherently included to the raw mixture in the process used to extract the raw mixture.
- the air separation plant is configured to extract the raw mixture from ambient air, wherein the raw mixture includes a neon/helium-ratio which is approximately equal to the neon/helium-ratio included in the ambient air, preferably of approximately 3.5.
- a neon/helium-ratio which is approximately equal to the neon/helium-ratio included in the ambient air, preferably of approximately 3.5.
- the refrigeration circuit is configured to implement a Brayton cycle or a Claude cycle which are particularly suitable for producing cryogenic refrigeration temperatures.
- the refrigeration circuit includes one or more turbo-compressors.
- the refrigeration circuit for instance involves the compression, preferably in one or more turbo-compressors, the cooling, expansion and warming-up of the refrigerant mixture.
- the mixture including neon has a low freezing point and a high molar mass compared to pure helium and hydrogen. The mixture is therefore particularly advantageous with respect to turbo-compressors.
- the cooling system is configured such that neither helium nor neon included in the raw mixture, preferably also in the refrigerant, is added by a source different from the air separation plant.
- the helium and neon are preferably extracted from air together as if they were a single component. This further reduces technical complexity and costs and further simplifies the logistics for obtaining the refrigerant.
- a method for producing a refrigerant usable in a refrigeration circuit for instance as described above, comprises extracting a raw mixture including helium and neon from air and obtaining the refrigerant from the raw mixture.
- a cooling method according to the invention utilizing the refrigerant as described above comprises: a process or method for producing the refrigerant according to the description above; and circulating the refrigerant in a refrigeration circuit, preferably used in or including a refrigeration plant and/or a condenser.
- FIG. 1 schematically illustrates a conventional process to provide mixtures of neon with helium as a refrigerant for a refrigeration and/or liquefaction plant.
- FIG. 2 schematically illustrates a system and process to obtain and supply a raw helium-neon mixture as a refrigerant for a refrigeration plant and/or a liquefier.
- FIG. 3 schematically illustrates a cooling system having an air separation plant and a refrigeration circuit.
- FIG. 4 schematically illustrates a cooling system according to a further embodiment.
- FIG. 5 schematically illustrates a cooling system according to a further embodiment.
- FIG. 1 illustrates the conventional process to provide a mixture including helium and neon as a refrigerant for a refrigeration and/or liquefaction plant.
- a first process line 100 includes an air separation plant 101 configured to separate ambient air into its component parts by cryogenic rectification.
- a neon rich stream produced from the air separation plant 101 is fed to a neon rectification column 102 to produce a second neon rich stream with a higher concentration of neon. This second neon rich stream is then purified and thereafter stored in to a neon-storage 103 .
- Helium is obtained via a second process line 110 which is locally separated from the first process line 100 .
- the helium is obtained and separated from natural gas (petroleum gas), which contains helium at a proportion of 1% or more, within a fractionating column 111 .
- Helium is extracted and accumulated within a subsequent process stage 112 and thereafter stored in a helium-storage 113 .
- the pure neon stored in the neon-storage 103 and the pure helium stored in the helium-storage 113 are mixed according to a desired ratio and supplied to a refrigeration plant 120 .
- FIG. 2 schematically illustrates a system and process according to the present disclosure to obtain and supply a raw helium-neon mixture (nelium) as a refrigerant for a refrigeration plant and/or a condenser including a refrigeration circuit 1 .
- the raw helium-neon mixture is obtained via an air separation plant 2 which includes one or more rectification columns. Thereafter the raw helium-neon mixture may be cleaned or further treated via a purification device 3 (described further below) and is supplied to the refrigeration circuit 1 .
- the mixture of helium and neon as a refrigerant preferably at a ratio as found in the ambient air (approximately 3.5).
- the mixture is typically regarded as a waste product due to missing applications.
- the ratio between neon and helium is almost constant due to the natural occurrence in ambient air. Since an enormous technical effort is required to obtain pure neon from air, only a small number of air separation plants worldwide are operated to separate and accumulate neon from air. Thus, directly utilizing the “waste” helium-neon mixture supplied by the air separation plant 2 drastically reduces costs and technical equipment for obtaining the refrigerant.
- the raw helium-neon mixture may be used as a refrigerant for cooling temperatures below 80 K to approximately 25 K.
- the cooling system may be equipped with a purification device 3 or absorber stages configured to remove impurities (mainly nitrogen but also other impurities).
- the raw helium-neon mixture which is extracted from the column(s) of the air separation plant 2 , i.e. typically a mixture of helium, neon, nitrogen and hydrogen, may be directly used as a refrigerant.
- the helium-neon mixture of neon, nitrogen, helium and hydrogen can be used in a refrigeration circuit 1 of a cooling system adapted for cooling temperatures below 80 K to 63 K (triple point of nitrogen). A small proportion of hydrogen does not interfere with the operation of the cooling system in the proposed temperature range above 25 K.
- the raw mixture obtained from the rectification column(s) of the air separation plant 2 is used as a refrigerant (or basis for a refrigerant) for instance in a refrigeration circuit of a refrigeration plant and/or a liquefier.
- the raw mixture may be used in a low-temperature refrigeration circuit including expansion turbine(s) (Brayton circuit) and/or in a low-temperature refrigeration circuit including expansion turbine(s) and at least one further expansion stage for instance including an expansion valve or expansion device (Claude circuit).
- the main components may comprise: a compressor configured to compress the mixture and/or a purification device or adsorber configured to eliminate impurities and/or a heat exchanger and/or an expansion turbine and/or expansion valve.
- the mixture used as a refrigerant has a low freezing point and a high molar mass compared to helium and hydrogen. The mixture is therefore particularly advantageous for use with turbo-compressors and expansion turbines. Unlike nitrogen, the helium-neon mixture used for cooling temperatures below 77 K does not have to be operated at a sub-atmospheric pressure.
- FIG. 3 illustrates an exemplary cooling system utilizing a direct application of the raw helium-neon mixture provided by the air separation plant 2 as a refrigerant circulated in the refrigeration circuit 1 which is configured as a Brayton cycle.
- the refrigerant preferably a mixture of helium, neon, nitrogen and hydrogen
- compressor 11 preferably configured as a turbo-compressor
- heat exchanger 13 a preferably configured as a plate heat exchanger.
- the refrigerant is expanded via an expansion device 14 .
- the expansion device 14 preferably includes a turbine or a number of turbine-stages. The work of the expansion is used to cool and/or liquefy an object 20 or fluid.
- the refrigerant is then heated in heat exchanger(s) 13 a , 13 b and supplied to the suction side of the compressor 11 .
- the helium-neon mixture as used in a process and refrigeration circuit 1 as illustrated in FIG. 3 is applicable for cooling temperatures below 80 K to 63 K (triple point of nitrogen).
- FIG. 4 illustrates a further cooling system using a raw helium-neon mixture provided by the air separation plant 2 as a refrigerant for a refrigeration circuit 1 ′ which is configured as a Claude cycle.
- the raw helium-neon mixture is compressed via compressor 11 , preferably configured as a turbo-compressor, and subsequently pre-cooled in the cooler 12 and heat exchanger 13 a , preferably configured as a plate heat exchanger. Thereafter, the raw helium-neon mixture is expanded via an expansion device 14 a and expansion valve (Joule-Thomson valve) 14 b . The refrigerant expanded in the expansion device 14 a is used to further cool a partial flow of the refrigerant. Further, the raw helium-neon mixture is purified in an adsorber tank 15 . In particular, nitrogen is separated from the raw helium-neon mixture.
- the refrigerant is cooled down in heat exchangers 13 b , 13 c and released in the expansion valve 14 b .
- the work of the expansion is used to cool and/or liquefy object 20 or to fluid.
- the refrigerant is then heated in the heat exchanger(s) 13 a , 13 b , 13 c and supplied to the suction side of the compressor 11 .
- the exemplary process illustrated in FIG. 4 is applicable for cooling temperatures between 80 K and 25 K.
- the refrigeration plant designed as a Claude circuit including the expansion valve 14 b and the adsorber tank 15 allows for lower temperatures as compared to the embodiment of FIG. 3 .
- FIG. 5 illustrates a further cooling system using a raw helium-neon mixture provided by the air separation plant 2 as a refrigerant for a refrigeration circuit 1 ′′.
- the cooling system according to the present embodiment includes a further purification in a purification device 3 and is adapted for cooling temperatures between 80 K and 25 K.
- the raw helium-neon mixture is purified in the purification device 3 by separating nitrogen.
- the resulting helium-neon-hydrogen mixture can then be used as a refrigerant in the refrigeration circuit 1 ′′ as illustrated in FIG. 5 for very low cooling temperatures up to 25 K.
- the refrigerant is supplied to the compressor 11 . Thereafter, the process essentially corresponds to the process illustrated in FIG. 4 .
- Possible applications for the helium-neon mixture extracted from the rectification column(s) of the air separation plant 2 include refrigeration plants for cooling of high-temperature superconductors (HTS, High Temperature Superconductor cooling) regarding temperatures below 80 K. Further applications include: precooling in refrigeration plants (e.g. shield cooling in particle accelerators) and liquefiers, particularly helium or hydrogen liquefiers.
- precooling in refrigeration plants e.g. shield cooling in particle accelerators
- liquefiers particularly helium or hydrogen liquefiers.
- the refrigerant and process may be used in refrigeration plants adapted for cooling temperatures between 25 K and 80 K, preferably between 30 K and 75 K.
- an air separation plant 2 is directly used for producing the refrigerant or a raw mixture including helium and neon. This solves the problem of availability and reduces technical complexity and costs as compared to the conventional processes which are based on separately extracting helium and neon and subsequently mixing the two components.
- the raw helium-neon mixture produced from the column(s) of the air separation plant (typically consisting of neon, nitrogen, helium and hydrogen) can directly be used without any further treatment in a refrigeration circuit configured for cooling temperatures below 80 K to approximately 63 K (triple point of nitrogen).
Abstract
Cooling system, preferably adapted for use in or including a refrigeration plant and/or liquefier plant, having a refrigeration circuit (1) configured to use a refrigerant including a mixture of helium and neon; wherein the refrigerant is based on a raw mixture, preferably is the raw mixture, including helium and neon, extracted from air by an air separation plant (2). Method for producing a refrigerant usable in a refrigeration circuit (1), comprising: extracting a raw mixture including helium and neon from air, wherein the raw mixture preferably further includes nitrogen and hydrogen; and using the raw mixture as the refrigerant or obtaining the refrigerant from the raw mixture.
Description
- The invention relates to a cooling system, preferably for use in or including a refrigeration plant and/or a liquefier plant, having a refrigeration circuit. The invention further relates to a method for producing a refrigerant usable in a refrigeration circuit.
- Refrigeration plants, configured to achieve very low temperatures of 80 K or below, typically use hydrogen or helium as a refrigerant. An industrial hydrogen liquefaction plant is known from
EP 3 163 236 A1, in which a hydrogen gas stream is cooled my means of a plurality of closed-loop cooling cycles to a temperature below a condensation point of hydrogen so as to provide a liquid hydrogen stream. - Refrigeration plants, adapted for temperatures below 80 K, usually apply a Brayton cycle or a Claude cycle with compression of the refrigerant at ambient temperature, heat exchange and refrigeration via expansion. The refrigerant is compressed via a screw type compressor, piston compressor or turbo-compressor. The turbo-compressor is favorable in view of efficiency, flow rate capacity and reliability.
- If temperatures below 54 K need to be achieved, only hydrogen, helium, neon or mixtures thereof are applicable, because other fluids would freeze at such very low temperatures. Generally speaking, helium used in refrigeration plants is more efficient than neon. On the other hand, compression of helium and hydrogen via turbo-compressors is difficult or requires a large number of compression stages due to the low molecular weight of the hydrogen. The molar weight of neon, however, is larger than that of helium and hydrogen. Thus, neon is advantageous in view of compression when used in combination for instance with helium and/or hydrogen.
- Such alternative refrigerants have been investigated, and it was found that mixtures of helium and neon, called “nelium”, allow processes with higher efficiency compared to pure neon; see Hans Quack, Christoph Haberstroh, Ilka Seemann, Marcel Klaus, “Nelium, a refrigerant with high potential for the temperature range between 27 and 70 K”, Physics Procedia 67 (2015) 176-182.
- The industrial application of neon mixtures with helium and/or hydrogen in refrigeration plants (in particular of large scale) involves a number of technical and economic challenges.
-
FIG. 1 illustrates the conventional process to provide a mixture including helium and neon as a refrigerant for a refrigeration and/or liquefaction plant. Afirst process line 100 includes anair separation plant 101 configured to separate ambient air into its component parts by cryogenic rectification. A neon rich stream produced from theair separation plant 101 is fed to aneon rectification column 102 to produce a second neon rich stream with a higher concentration of neon. This second neon rich stream is then purified and thereafter stored in a neon-storage 103. - Helium is obtained from a different plant via a
second process line 110 which is locally separated from thefirst process line 100. Usually the helium is obtained and separated from natural gas, to which contains helium at a proportion of 1% or more, within a fractionatingcolumn 111. Helium is extracted and accumulated within asubsequent process stage 112 and thereafter stored in a helium-storage 113. The pure neon stored in the neon-storage 103 and the pure helium stored in the helium-storage 113 are mixed according to a desired ratio and supplied to arefrigeration plant 120. - Helium and neon, as well as mixtures thereof are rather expensive gases. Pure neon is considerably more expensive than helium and not available everywhere. Moreover, refrigeration systems are not completely leak-proof. Considerable quantities of the product may get lost especially during maintenance work. This implies substantial initial, operating and maintenance costs. Moreover, the technology and logistics are complicated. Helium is usually extracted from natural gas. Neon is separated from air by applying a complex process. Thus, both gases are usually extracted, transported and delivered separately and only subsequently mixed to be used in a refrigeration circuit or refrigeration plant.
- To maintain the required characteristics in the refrigeration circuit or refrigeration plant, the mixture, particularly the ratio of neon and helium, has to be monitored and adjusted, which additionally implies technical challenges and costs regarding the analysis and gas management system.
- It is an object of the present invention to provide a cooling system and a method for producing a refrigerant which solves or reduces at least one of the above mentioned problems.
- The object is solved with a cooling system having the features of
claim 1 and a method having the features of claim 9. Preferred embodiments are given by the dependent claims, the description and the drawings. - According to a first aspect of the invention, there is provided a cooling system including a refrigeration circuit configured to use a refrigerant including a mixture of helium and neon; wherein the refrigerant is based on a raw mixture, preferably the refrigerant comprises the raw mixture, and wherein the raw mixture extracted from air by an air separation plant.
- The cooling system is preferably adapted for use in or including a refrigeration plant and/or a liquefiers. This for instance includes refrigeration plants for cooling high-temperature superconductors, precooling in refrigeration plants (e.g. shield cooling in particle accelerators) and liquefiers, particularly helium or hydrogen liquefiers, etc.
- The cooling system according to the invention has a refrigeration circuit configured to use a refrigerant including a mixture of helium and neon. Preferably, the mixture comprises helium, neon and hydrogen. The refrigerant is based on a raw mixture, preferably is the raw mixture, including helium and neon, extracted from air by an air separation plant. Preferably, the cooling system has the air separation plant configured to extract from air the raw mixture including helium and neon. In other words, both components—helium and neon—are extracted from the air.
- The extraction is preferably done by the same process and/or simultaneously such that after the process the raw mixture is present without any further processing. In particular, the raw mixture to be used as the refrigerant is provided by extracting it as such from air but not by supplying it by mixing two or more gases which are provided in separate processes or extracted from different raw materials such as air and natural gas.
- Preferably, the raw mixture including helium and neon is extracted from air in rectification columns of the (cryogenic) air separation plant. The air separation plant may be locally separated from the refrigeration circuit. Further, the raw mixture may be extracted at any time and stored until usage. According to the invention, the raw mixture ex is directly used as the refrigerant or forms the basis of the refrigerant. In other words, the raw mixture including helium and neon (possibly as well as other components) is used as the refrigerant with or without further treatment, such as cleaning.
- Importantly, the raw mixture including helium and neon is extracted from the air via the air separation plant. This helps solving the problem of availability and reduces technical complexity and costs as compared to the conventional processes for extracting helium and neon separately and subsequently mixing the two components. The logistics for obtaining the refrigerant is simplified since the desired raw mixture is provided via “one source”, i.e. air as the source not for the individual components but the raw mixture itself.
- Preferably the raw mixture further includes nitrogen and/or hydrogen. A certain amount of nitrogen and/or hydrogen is permitted depending on the intended cooling temperatures. Maintaining nitrogen and/or hydrogen in the raw mixture and preferably also in the refrigerant helps further reducing the technical complexity, because the extracted raw mixture may be used without further treatment, particularly without purification, for instance in an adsorber. Hydrogen, which is present in ambient air in a concentration of usually 0.4 ppm, may be present in the raw mixture and/or refrigerant corresponding to the amount of 2% or below. Thus, the raw helium-neon mixture produced from the column(s) of the air separation plant (typically consisting of neon, nitrogen, helium and hydrogen) can directly be used without any further treatment in the refrigeration circuit preferably configured for cooling temperatures below 80 K to approximately 63 K (triple point of nitrogen).
- Preferably, the cooling system further includes a purification device configured to remove impurities, to for example nitrogen, from the raw mixture. This provides a refrigerant suitable for lower cooling temperatures such as below 80 K, preferably below 70 K, to approximately 25 K. “Impurities” in this connotation are to be understood to refer to the components not desired in a refrigerant for a particular application but which are inherently included to the raw mixture in the process used to extract the raw mixture.
- Preferably, the air separation plant is configured to extract the raw mixture from ambient air, wherein the raw mixture includes a neon/helium-ratio which is approximately equal to the neon/helium-ratio included in the ambient air, preferably of approximately 3.5. In this very preferred case of maintaining the natural ratio of neon and helium (present in a ratio of approximately 3.5 in ambient air), which is constant worldwide, there is no need for technical solutions regarding the mixture and management of the raw mixture and/or refrigerant. The logistics for obtaining the refrigerant is further simplified.
- Preferably the refrigeration circuit is configured to implement a Brayton cycle or a Claude cycle which are particularly suitable for producing cryogenic refrigeration temperatures.
- Preferably the refrigeration circuit includes one or more turbo-compressors. The refrigeration circuit for instance involves the compression, preferably in one or more turbo-compressors, the cooling, expansion and warming-up of the refrigerant mixture. The mixture including neon has a low freezing point and a high molar mass compared to pure helium and hydrogen. The mixture is therefore particularly advantageous with respect to turbo-compressors.
- Preferably the cooling system is configured such that neither helium nor neon included in the raw mixture, preferably also in the refrigerant, is added by a source different from the air separation plant. Moreover, the helium and neon are preferably extracted from air together as if they were a single component. This further reduces technical complexity and costs and further simplifies the logistics for obtaining the refrigerant.
- According to the invention, a method for producing a refrigerant usable in a refrigeration circuit, for instance as described above, is provided. The method comprises extracting a raw mixture including helium and neon from air and obtaining the refrigerant from the raw mixture.
- The technical effects, preferred or optional features as well as technical contributions and advantages described with respect to the cooling system similarly apply to the method for producing the refrigerant.
- A cooling method according to the invention utilizing the refrigerant as described above comprises: a process or method for producing the refrigerant according to the description above; and circulating the refrigerant in a refrigeration circuit, preferably used in or including a refrigeration plant and/or a condenser.
- The technical effects, preferred or optional features as well as technical contributions and advantages described with respect to the cooling system similarly apply to the cooling method.
- The present disclosure will be more readily appreciated by reference to the following detailed description when being considered in connection with the accompanying drawing.
-
FIG. 1 schematically illustrates a conventional process to provide mixtures of neon with helium as a refrigerant for a refrigeration and/or liquefaction plant. -
FIG. 2 schematically illustrates a system and process to obtain and supply a raw helium-neon mixture as a refrigerant for a refrigeration plant and/or a liquefier. -
FIG. 3 schematically illustrates a cooling system having an air separation plant and a refrigeration circuit. -
FIG. 4 schematically illustrates a cooling system according to a further embodiment. -
FIG. 5 schematically illustrates a cooling system according to a further embodiment. - In the following, preferred embodiments of the invention will be described with reference to the drawings. Elements that are identical, similar or have an identical or similar effect are provided with the same reference numerals in the figures. Repeating the description of such elements may be omitted in order to prevent redundant descriptions.
- As has been discussed above,
FIG. 1 illustrates the conventional process to provide a mixture including helium and neon as a refrigerant for a refrigeration and/or liquefaction plant. Afirst process line 100 includes anair separation plant 101 configured to separate ambient air into its component parts by cryogenic rectification. A neon rich stream produced from theair separation plant 101 is fed to aneon rectification column 102 to produce a second neon rich stream with a higher concentration of neon. This second neon rich stream is then purified and thereafter stored in to a neon-storage 103. Helium is obtained via asecond process line 110 which is locally separated from thefirst process line 100. Usually the helium is obtained and separated from natural gas (petroleum gas), which contains helium at a proportion of 1% or more, within afractionating column 111. Helium is extracted and accumulated within asubsequent process stage 112 and thereafter stored in a helium-storage 113. The pure neon stored in the neon-storage 103 and the pure helium stored in the helium-storage 113 are mixed according to a desired ratio and supplied to arefrigeration plant 120. -
FIG. 2 schematically illustrates a system and process according to the present disclosure to obtain and supply a raw helium-neon mixture (nelium) as a refrigerant for a refrigeration plant and/or a condenser including arefrigeration circuit 1. The raw helium-neon mixture is obtained via anair separation plant 2 which includes one or more rectification columns. Thereafter the raw helium-neon mixture may be cleaned or further treated via a purification device 3 (described further below) and is supplied to therefrigeration circuit 1. - It is proposed to use the mixture of helium and neon as a refrigerant preferably at a ratio as found in the ambient air (approximately 3.5). This advantageously implies that the mixture is provided by the
air separation plant 2 without further treatment. The mixture is typically regarded as a waste product due to missing applications. The ratio between neon and helium is almost constant due to the natural occurrence in ambient air. Since an enormous technical effort is required to obtain pure neon from air, only a small number of air separation plants worldwide are operated to separate and accumulate neon from air. Thus, directly utilizing the “waste” helium-neon mixture supplied by theair separation plant 2 drastically reduces costs and technical equipment for obtaining the refrigerant. - The raw helium-neon mixture may be used as a refrigerant for cooling temperatures below 80 K to approximately 25 K. In this case the cooling system may be equipped with a
purification device 3 or absorber stages configured to remove impurities (mainly nitrogen but also other impurities). Alternatively the raw helium-neon mixture, which is extracted from the column(s) of theair separation plant 2, i.e. typically a mixture of helium, neon, nitrogen and hydrogen, may be directly used as a refrigerant. The helium-neon mixture of neon, nitrogen, helium and hydrogen can be used in arefrigeration circuit 1 of a cooling system adapted for cooling temperatures below 80 K to 63 K (triple point of nitrogen). A small proportion of hydrogen does not interfere with the operation of the cooling system in the proposed temperature range above 25 K. - The raw mixture obtained from the rectification column(s) of the
air separation plant 2 is used as a refrigerant (or basis for a refrigerant) for instance in a refrigeration circuit of a refrigeration plant and/or a liquefier. In particular, the raw mixture may be used in a low-temperature refrigeration circuit including expansion turbine(s) (Brayton circuit) and/or in a low-temperature refrigeration circuit including expansion turbine(s) and at least one further expansion stage for instance including an expansion valve or expansion device (Claude circuit). - In the following, cooling systems according to different embodiments applying the process and mixture described herein are described with respect to the
FIGS. 3 to 5 . The main components may comprise: a compressor configured to compress the mixture and/or a purification device or adsorber configured to eliminate impurities and/or a heat exchanger and/or an expansion turbine and/or expansion valve. The mixture used as a refrigerant has a low freezing point and a high molar mass compared to helium and hydrogen. The mixture is therefore particularly advantageous for use with turbo-compressors and expansion turbines. Unlike nitrogen, the helium-neon mixture used for cooling temperatures below 77 K does not have to be operated at a sub-atmospheric pressure. -
FIG. 3 illustrates an exemplary cooling system utilizing a direct application of the raw helium-neon mixture provided by theair separation plant 2 as a refrigerant circulated in therefrigeration circuit 1 which is configured as a Brayton cycle. - The refrigerant, preferably a mixture of helium, neon, nitrogen and hydrogen, is compressed via
compressor 11, preferably configured as a turbo-compressor, and subsequently pre-cooled in a cooler 12 andheat exchanger 13 a, preferably configured as a plate heat exchanger. Thereafter, the refrigerant is expanded via anexpansion device 14. Theexpansion device 14 preferably includes a turbine or a number of turbine-stages. The work of the expansion is used to cool and/or liquefy anobject 20 or fluid. The refrigerant is then heated in heat exchanger(s) 13 a, 13 b and supplied to the suction side of thecompressor 11. - The helium-neon mixture as used in a process and
refrigeration circuit 1 as illustrated inFIG. 3 is applicable for cooling temperatures below 80 K to 63 K (triple point of nitrogen). -
FIG. 4 illustrates a further cooling system using a raw helium-neon mixture provided by theair separation plant 2 as a refrigerant for arefrigeration circuit 1′ which is configured as a Claude cycle. - The raw helium-neon mixture is compressed via
compressor 11, preferably configured as a turbo-compressor, and subsequently pre-cooled in the cooler 12 andheat exchanger 13 a, preferably configured as a plate heat exchanger. Thereafter, the raw helium-neon mixture is expanded via anexpansion device 14 a and expansion valve (Joule-Thomson valve) 14 b. The refrigerant expanded in theexpansion device 14 a is used to further cool a partial flow of the refrigerant. Further, the raw helium-neon mixture is purified in anadsorber tank 15. In particular, nitrogen is separated from the raw helium-neon mixture. The refrigerant is cooled down inheat exchangers expansion valve 14 b. The work of the expansion is used to cool and/or liquefyobject 20 or to fluid. The refrigerant is then heated in the heat exchanger(s) 13 a, 13 b, 13 c and supplied to the suction side of thecompressor 11. - The exemplary process illustrated in
FIG. 4 is applicable for cooling temperatures between 80 K and 25 K. Thus, the refrigeration plant designed as a Claude circuit including theexpansion valve 14 b and theadsorber tank 15 allows for lower temperatures as compared to the embodiment ofFIG. 3 . -
FIG. 5 illustrates a further cooling system using a raw helium-neon mixture provided by theair separation plant 2 as a refrigerant for arefrigeration circuit 1″. The cooling system according to the present embodiment includes a further purification in apurification device 3 and is adapted for cooling temperatures between 80 K and 25 K. - The raw helium-neon mixture is purified in the
purification device 3 by separating nitrogen. The resulting helium-neon-hydrogen mixture can then be used as a refrigerant in therefrigeration circuit 1″ as illustrated inFIG. 5 for very low cooling temperatures up to 25 K. After purifying the raw mixture in thepurification device 3, the refrigerant is supplied to thecompressor 11. Thereafter, the process essentially corresponds to the process illustrated inFIG. 4 . - Possible applications for the helium-neon mixture extracted from the rectification column(s) of the
air separation plant 2 include refrigeration plants for cooling of high-temperature superconductors (HTS, High Temperature Superconductor cooling) regarding temperatures below 80 K. Further applications include: precooling in refrigeration plants (e.g. shield cooling in particle accelerators) and liquefiers, particularly helium or hydrogen liquefiers. The refrigerant and process may be used in refrigeration plants adapted for cooling temperatures between 25 K and 80 K, preferably between 30 K and 75 K. - According to the described embodiments, an
air separation plant 2 is directly used for producing the refrigerant or a raw mixture including helium and neon. This solves the problem of availability and reduces technical complexity and costs as compared to the conventional processes which are based on separately extracting helium and neon and subsequently mixing the two components. - In the preferred case of maintaining the natural ratio of neon and helium of approximately 3.5 which is present in ambient air and which is constant worldwide, there is no need for technical solutions regarding the mixture and management of the composition. The logistics for obtaining the refrigerant is simplified since the desired mixture is provided via “one source”, i.e. air as the source not for the individual components but the resulting mixture. It is possible to compress the raw helium-neon mixture via a turbo-compressor including a small number of compressor stages.
- Adding or maintaining a slight amount of hydrogen (usually 0.4 ppm in ambient air) corresponding to 2% or below in the helium-neon mixture is possible. Thus, the raw helium-neon mixture produced from the column(s) of the air separation plant (typically consisting of neon, nitrogen, helium and hydrogen) can directly be used without any further treatment in a refrigeration circuit configured for cooling temperatures below 80 K to approximately 63 K (triple point of nitrogen).
- It will be obvious for a person skilled in the art that the embodiments and items only depict examples of a plurality of possibilities. Hence, the embodiments shown here should not be understood to form a limitation of these features and configurations. Any possible combination and configuration of the described features can be chosen according to the scope of the invention.
-
- 1 Refrigeration circuit
- 1′ Refrigeration circuit
- 1″ Refrigeration circuit
- 2 Air separation plant
- 3 Purification device
- 11 Compressor
- 12 Cooler
- 13 a Heat exchanger
- 13 b Heat exchanger
- 13 c Heat exchanger
- 14 Expansion device
- 14 a Expansion device
- 14 b Expansion valve
- 15 Adsorber tank
- 20 Object to be cooled
- 100 First process line
- 101 Air separation plant
- 102 Neon rectification column
- 103 Neon-storage
- 110 Second process line
- 111 Fractionating column
- 112 Subsequent process stage
- 113 Helium-storage
- 120 Refrigeration plant
Claims (15)
1. Cooling system, preferably adapted for use in or including a refrigeration plant and/or liquefier plant,
the cooling system including a refrigeration circuit (1) configured to use a refrigerant including a mixture of helium and neon; wherein
the refrigerant is based on a raw mixture, preferably the refrigerant comprises the raw mixture, and wherein the raw mixture extracted from air by an air separation plant (2).
2. Cooling system according to claim 1 , further including an air separation plant (2) configured to extract the raw mixture including helium and neon from air, wherein the raw mixture is used as the refrigerant or forms the basis of the refrigerant.
3. Cooling system according to claim 1 , wherein the raw mixture further includes nitrogen and/or hydrogen.
4. Cooling system according to claim 1 , further including a purification device (3) configured to remove impurities, preferably nitrogen, from the raw mixture.
5. Cooling system according to claim 1 , wherein the air separation plant (2) is configured to extract the raw mixture from ambient air and the raw mixture preferably includes a neon/helium-ratio which is approximately equal to the neon/helium-ratio present in the ambient air, preferably of approximately 3.5.
6. Cooling system according to claim 1 , wherein the cooling system and the refrigerant are configured for cooling temperatures below 80 K, preferably below 70 K or 63 K, to approximately 25 K.
7. Cooling system according to claim 1 , wherein the refrigeration circuit (1) is configured to implement a Brayton cycle or a Claude cycle and/or the refrigeration circuit (1) includes one or more turbo-compressors (11).
8. Cooling system according to claim 1 , wherein the raw mixture including helium and neon is extracted from air in rectification columns of the cryogenic air separation plant (2).
9. Cooling system according to claim 1 , wherein the cooling system is configured such that neither helium nor neon included in the raw mixture, preferably also in the refrigerant, is added by a source different from the air separation plant (2).
10. Cooling system according to claim 1 , wherein the refrigeration circuit (1) is configured for cooling and/or liquefaction of gases, preferably helium and/or neon and/or hydrogen.
11. Method for producing a refrigerant usable in a refrigeration circuit (1), comprising:
extracting a raw mixture including helium and neon from air, wherein the raw mixture preferably further includes nitrogen and hydrogen; and
using the raw mixture as the refrigerant or obtaining the refrigerant from the raw mixture.
12. Method according to claim 11 , further comprising removing impurities, preferably nitrogen, from the raw mixture.
13. Method according to claim 11 , wherein the raw mixture is extracted from ambient air, and the raw mixture includes a neon/helium-ratio which is approximately equal to the neon/helium-ratio included in the ambient air, preferably of approximately 3.5.
14. Cooling method, comprising:
a method for producing a refrigerant according to claim 11 ; and
circulating the refrigerant in a refrigeration circuit (1), preferably the refrigerant circuit being used in or including a refrigeration plant and/or a liquefier plant.
15. Cooling method according to claim 14 , wherein the refrigeration circuit (1) implements a Brayton cycle or a Claude cycle, and the refrigeration circuit (1) preferably includes one or more turbo-compressors (11).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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GB1803389.4A GB2571569A (en) | 2018-03-02 | 2018-03-02 | Cooling system |
GB1803389.4 | 2018-03-02 | ||
PCT/EP2019/054634 WO2019166383A1 (en) | 2018-03-02 | 2019-02-25 | Cooling system |
Publications (1)
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US20200400371A1 true US20200400371A1 (en) | 2020-12-24 |
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US (1) | US20200400371A1 (en) |
EP (1) | EP3759192A1 (en) |
JP (1) | JP2021515169A (en) |
KR (1) | KR20200130252A (en) |
CN (1) | CN111819264A (en) |
GB (1) | GB2571569A (en) |
WO (1) | WO2019166383A1 (en) |
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US11391511B1 (en) | 2021-01-10 | 2022-07-19 | JTurbo Engineering & Technology, LLC | Methods and systems for hydrogen liquefaction |
FR3119883B1 (en) | 2021-02-18 | 2023-03-31 | Air Liquide | Hydrogen liquefaction method and apparatus |
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Publication number | Publication date |
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GB2571569A (en) | 2019-09-04 |
KR20200130252A (en) | 2020-11-18 |
GB201803389D0 (en) | 2018-04-18 |
WO2019166383A1 (en) | 2019-09-06 |
CN111819264A (en) | 2020-10-23 |
GB2571569A8 (en) | 2019-10-09 |
EP3759192A1 (en) | 2021-01-06 |
JP2021515169A (en) | 2021-06-17 |
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