EP1067345A1 - Verfahren und Vorrichtung zur Tieftemperaturzerlegung von Luft - Google Patents
Verfahren und Vorrichtung zur Tieftemperaturzerlegung von Luft Download PDFInfo
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- EP1067345A1 EP1067345A1 EP99121174A EP99121174A EP1067345A1 EP 1067345 A1 EP1067345 A1 EP 1067345A1 EP 99121174 A EP99121174 A EP 99121174A EP 99121174 A EP99121174 A EP 99121174A EP 1067345 A1 EP1067345 A1 EP 1067345A1
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- EP
- European Patent Office
- Prior art keywords
- heat exchanger
- main heat
- cold
- partial
- cold end
- 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.)
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000000926 separation method Methods 0.000 title claims description 6
- 238000007906 compression Methods 0.000 claims abstract description 35
- 230000006835 compression Effects 0.000 claims abstract description 33
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 238000005191 phase separation Methods 0.000 claims description 9
- 239000012808 vapor phase Substances 0.000 claims description 2
- 238000000605 extraction Methods 0.000 abstract 2
- 239000007788 liquid Substances 0.000 description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 238000004781 supercooling Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 241000883306 Huso huso Species 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 238000003860 storage Methods 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
- 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
- F25J3/04406—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 using a dual pressure main column system
- F25J3/04412—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 using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
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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
- F25J1/0012—Primary atmospheric gases, e.g. air
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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
- F25J1/0221—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 the cold stored in an external cryogenic component in an open refrigeration loop
- F25J1/0224—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 the cold stored in an external cryogenic component in an open refrigeration loop in combination with an internal quasi-closed refrigeration loop
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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
- 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
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04048—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams
- F25J3/04054—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams of air
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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
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
- F25J3/0409—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
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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
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
- F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
- F25J3/04296—Claude expansion, i.e. expanded into the main or high pressure column
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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
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04333—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams
- F25J3/04339—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of air
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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
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
- F25J3/04381—Details relating to the work expansion, e.g. process parameter etc. using work extraction by mechanical coupling of compression and expansion so-called companders
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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
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
- F25J2205/04—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum in the feed line, i.e. upstream of the fractionation step
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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
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/20—Integrated compressor and process expander; Gear box arrangement; Multiple compressors on a common shaft
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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
- F25J2245/00—Processes or apparatus involving steps for recycling of process streams
- F25J2245/40—Processes or apparatus involving steps for recycling of process streams the recycled stream being air
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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
- F25J2270/02—Internal refrigeration with liquid vaporising loop
Definitions
- the invention relates to a method for the low-temperature separation of air, in which compressed and cleaned feed air cooled in a main heat exchanger and is supplied at least in part to a rectification column, a first partial stream the feed air at an intermediate temperature from the main heat exchanger removed and fed to a cold compression at this intermediate temperature.
- the invention is used in cases where part of the feed air ("first partial stream") is post-compressed, for example in order to evaporate a liquid process stream to be used.
- a liquid process stream it can a product stream (e.g. liquid oxygen, liquid nitrogen or liquid argon) from a rectification column to the bottom or intermediate liquid a rectification column or an external liquid that for example, is removed from a storage tank.
- product stream e.g. liquid oxygen, liquid nitrogen or liquid argon
- the "main heat exchanger" is preferably replaced by a single one Heat exchanger block formed. In the case of larger systems, it may make sense to use the Main heat exchanger through several in terms of temperature history parallel strands to be realized by separate Components are formed. Basically, it is possible that the Main heat exchanger or each of these strands by two or more serially connected blocks is formed.
- this densification is carried out in a conventional manner, by the partial air flow at about an ambient temperature of a corresponding Machine is fed.
- a cold compressor for post-compression be used.
- Under "cold compression” there is a compression process understood, in which the gas is supplied to the compression at a temperature which is well below ambient temperature, generally below 250 K, preferably below 200 K.
- the invention has for its object the method of the type mentioned and to specify a corresponding device that is particularly energetically favorable are operating.
- This object is achieved in that the first partial stream upstream of it Removal is heated in the main heat exchanger.
- the partial air flow provided for the cold compression is thus initially cooled further than is actually necessary in the main heat exchanger, i.e. via the Intermediate temperature, which is about the entry temperature of the cold compression corresponds. Then he - again in the main heat exchanger - on the Intermediate temperature warmed up.
- This procedure appears at first glance unfavorable, because of the unnecessary cooling and reheating additional exchange losses and thus higher energy consumption can be expected.
- the Heat transfer in the cold part of the main heat exchanger (below the Intermediate temperature) is improved.
- the ones to be heated and currents to be cooled have a higher density than in the warm part.
- the Heat exchanger passages that they flow through usually have constructive Establish the same number and the same cross-sections.
- the passages are cold Part operated with an underload of about 20%, so to speak. Due to this fact the flow conditions in the cold part of the main heat exchanger are not optimal.
- the invention achieves an improvement here by - specifically anyway treating - partial air flow for cold compression both the ones to be cooled and the currents to be heated are also supplemented. It has been found that the Improvement of the heat transfer through the optimized in the context of the invention Flow conditions in the cold part of the main heat exchanger expected additional exchange losses overcompensated and overall leads to an energetically particularly favorable process.
- the first partial flow can be downstream against the cold compression evaporating process stream are at least partially liquefied.
- This Heat exchange step can either be in the main heat exchanger or in one separate condenser-evaporator. This is particularly cheap Procedure if all or a large part of the oxygen product as Liquid removed from the rectification, pressurized in liquid form and is finally evaporated against the cold compressed partial air flow. In this case So much air is cold compressed that the flow conditions in the cold part of the main heat exchanger by reheating it according to the invention Partial air flow are practically optimal.
- the first partial stream is heated to the cold end of the Main heat exchanger introduced. So it is completely through the Main heat exchanger guided and flows through the entire cold part of the main heat exchanger, so that the entire cold part of the Main heat exchanger can enjoy the improved flow.
- the cooling of the first substream can be carried out separately from or together with other parts of the feed air.
- the Cooling air flow after it is removed from the cold end of the Main heat exchanger subjected to phase separation the first partial flow at least by part of the vapor phase removed from the phase separation is formed.
- the entire vapor portion is preferably from the phase separation led to cold compression while the separated liquid into or one the rectification columns is fed, for example into the pressure column of a Two-column apparatus.
- cooling air flow is expanded, before being subjected to phase separation. But even if there is no Phase separation, it may be useful to throttle the cooling air flow before using it first partial flow is fed to the cold end of the main heat exchanger.
- all of the electricity that is subjected to cold compression can are formed by the first partial flow, which at the intermediate point from the Main heat exchanger is withdrawn.
- the cooling air flow is divided into the first partial flow and a second partial flow is introduced, the first partial flow in the cold end of the main heat exchanger and the second partial flow without temperature-changing measures with the first partial flow between its removal at the first intermediate temperature and the cold compression is fed.
- This will also cause cold in the Cold compression current introduced, for partial or full compensation or possibly even for overcompensation during cold compression Compression heat is used. This gives you an additional parameter that is used for Optimization of the heat exchange process can be used.
- the first partial flow can be downstream of the cold compression at an intermediate point of the main heat exchanger, which corresponds to a second intermediate temperature, the Cooling air flow are supplied. Without the one described in the previous paragraph Compensation for the heat of compression lies at this second intermediate temperature above the first intermediate temperature. When mixed with the very cold second partial air flow upstream of the cold compression, the second Intermediate temperature at or even below the first intermediate temperature.
- a turbine air flow in the main heat exchanger is directed to a the third intermediate temperature is cooled and then relaxed in a work-performing manner, wherein at least a portion of the relaxation generated during work relaxation mechanical energy is used to drive the cold compression. If that's for the process does not require cold to be generated by another expansion machine it is necessary to use the expansion machine not only with the cold compressor, but also to couple with a generator or a brake blower.
- the invention also relates to a device for the low-temperature separation of air according to claims 5 to 8.
- Atmospheric air 1 is compressed after flowing through a filter 2 (3) and Direct contact cooler 4 initiated. There it comes into countercurrent contact with liquid Water 5.
- the water 6 remaining liquid in the direct heat exchange becomes withdrawn from the direct contact cooler 4.
- the cooled and steamed laden air 7 is in a cleaning device 8 of water and carbon dioxide and optionally freed of further impurities.
- the cleaning facility 8 is preferably formed by at least two switchable containers, which with an adsorbent, for example a molecular sieve.
- the cleaned feed air flow 9 is divided into a first main air flow 10 and one split second main air stream 20.
- the former flows to the warm end of one Main heat exchanger 30 is in the main heat exchanger 30 to about dew point cooled, removed again at the cold end and finally via lines 11 and 12 fed to the bottom of the pressure column 50 of a double column.
- the second main air stream 20 is in an externally driven secondary compressor 21 further compressed and after flowing through an aftercooler 22 also warm End inserted into the main heat exchanger 30 (line 23).
- Part 24 of the second Main air flow the "cooling air flow” remains in the cold end Main heat exchanger 30 and 25 - if necessary after slight throttling "First partial flow" 26 reintroduced into the main heat exchanger 30, namely in the Warm-up passages 17.
- the first partial flow removed via line 28 and fed to a cold compressor 29.
- the cold compacted first partial flow 31 is at a second intermediate temperature, which in the example is higher than the first intermediate temperature, again into the main heat exchanger 30 introduced, namely in the cooling passages 32.
- After cooling and at least partial liquefaction in the main heat exchanger becomes the first partial flow 33 finally fed into the pressure column 50 via the valve 34.
- the feed point is one or more theoretical or practical floors above the Pressure column sump.
- Another part 35 of the second main air stream 23 becomes a third Intermediate temperature, which in the example is between the first and the second Intermediate temperature is taken as "turbine air flow" and one Relaxation machine 36 supplied, which is on a common shaft with the Cold compressor 29 and a generator 37 is coupled.
- the work relaxed Air 38 together with the first main air stream 11 via line 12 to the sump the pressure column 50 out.
- the double column has a low pressure column 51. Both Parts are on a common condenser-evaporator 52, the Main condenser in heat exchanging connection. Top gas 53 of the pressure column 50 is at least partially condensed in the main condenser 52. The condensate flows to a first part 55 as a return to the pressure column 50, to a second part 55 it is subcooled in a supercooling counterflow 56 and via line 57 and valve 58 placed on top of the low pressure column 51.
- Raw oxygen from the lower region of the pressure column 50 flows up in the example two different routes to the low pressure column 51.
- a first raw oxygen fraction 59 is subcooled from the bottom of the pressure column (56) and via line 60 and Throttle valve 61 transferred to the low pressure column.
- At the level of the infeed of the liquefied first partial air stream 33 becomes a second crude oxygen liquid of the pressure column 50 and in a similar manner (subcooling 56, line 63 and valve 64) are fed into the low-pressure column 51 at a somewhat higher point.
- the oxygen product is liquid via line 65 from the bottom of the Low pressure column 51 withdrawn by a pump 66 in the liquid state on the brought desired product pressure, via line 67 to the main heat exchanger 30 led, evaporated there and warmed to about ambient temperature.
- the Oxygen leaves the system via line 68 as an internally compressed product (GOX-IC, gaseous oxygen - internally compressed).
- no pure nitrogen is produced.
- the nitrogen rich Top product 69 is used as residual gas in the supercooling counterflow 56 and in Main heat exchanger 30 warmed up.
- the warm residual gas 70 can be conducted directly via the line 71 can be released into the atmosphere and / or via line 72 - if necessary after heating 73 - used as regeneration gas for the cleaning device 8 become.
- the moist regeneration gas flows via line 74 to the atmosphere.
- Deviating from the embodiment can in the low pressure column on the pure nitrogen can also be obtained in a known manner.
- the evaporation of the liquid pressurized oxygen 67 can also be outside the main heat exchanger 30 is carried out in a separate product evaporator (secondary condenser), whose liquefaction space downstream of the first substream Cold compression 29 is flowed through.
- FIG. 2 corresponds to the method and the device of FIG Figure 1 in large parts. In the following only the different aspects in the described.
- the cooling air stream 24 is downstream of its removal from the cold end the main heat exchanger 30 or the optional valve 25 to two Streams divided, namely the "first sub-stream" 226 - 227 - 228, which is analogous to that 1 to the cold compressor 29, and a "second partial flow" 201, which - regulated by valve 202 - on the main heat exchanger 30 and in particular passed the warm-up passages 227 and at 203 the first Intermediate temperature warmed first partial stream 228 is mixed.
- the Mixture flows at a correspondingly lower temperature at the entry of the Cold compressor 29.
- the cold compressed air 231 also has a lower one Temperature than in Figure 1, in the specific example of Figure 2 is the second Intermediate temperature even lower than the first intermediate temperature.
- Corresponding the cooling and liquefaction passages 232 are shorter for the first one Partial flow downstream of the cold compression.
- the cooling air flow 24 is here after partial liquefaction Main heat exchanger 30 and throttling 25 for phase separation into one Separator 301 initiated.
- the liquid phase becomes analogous to stream 33 from FIG. 1 fed into the pressure column 50 via line 333 and valve 334.
- the steam 326 out the separator 301 forms the "first partial flow" which, as in FIG Cold compression 29 is performed. Downstream of the cold compression 29 cold-compressed first partial flow 331, however, not in its own cooling passages introduced, but mixed with the second main air flow.
- the cold compressed The amount of air will thus be circulated in a 24 - 25 - 301 - 326 - 29 - 331 cycle.
- the heat transfer in the cold part of the main heat exchanger can be special be designed cheaply.
- Figure 4 differs from Figure 3 in the same way, Figure 2 is different from Figure 1, namely by an additional "second partial air flow” 401.
- the admixture 403 of the cold second partial stream is used 401 to the first partial flow 428, which is heated to the first intermediate temperature Compensation or overcompensation of the heat of compression, which at the cold compression 29 arises.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
Description
- Figur 1
- ein erstes Ausführungsbeispiel für die Erfindung,
- Figur 2
- eine Abwandlung des ersten Ausführungsbeispiels,
- Figur 3
- ein zweites Ausführungsbeispiel für die Erfindung und
- Figur 4
- eine Abwandlung des zweiten Ausführungsbeispiels.
Claims (10)
- Verfahren zur Tieftemperaturzerlegung von Luft, bei dem verdichtete und gereinigte Einsatzluft (9, 10, 20) in einem Hauptwärmetauscher (30) abgekühlt und mindestens zum Teil einer Rektifiziersäule (50) zugeführt (12, 33, 333) wird, wobei ein erster Teilstrom (26, 226, 326, 426) der Einsatzluft dem Hauptwärmetauscher (30) zugeführt, mindestens zum Teil bei einer ersten Zwischentemperatur aus dem Hauptwärmetauscher entnommen (28, 228, 428) und einer Kaltverdichtung (29) zugeführt wird, dadurch gekennzeichnet, daß der erste Teilstrom (26, 226, 326, 426) stromaufwärts seiner Entnahme (28, 228, 428) bei der ersten Zwischentemperatur im Hauptwärmetauscher (30) angewärmt (27, 227) wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der erste Teilstrom (26, 226, 326, 426) vor seiner Anwärmung (27, 227) in das kalte Ende des Hauptwärmetauschers (30) eingeführt wird.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß ein Abkühlluftstrom (23, 24) im Hauptwärmetauscher (30) abgekühlt, am kalten Ende des Hauptwärmetauschers entnommen (24) und mindestens zum Teil als erster Teilstrom (26, 226, 326, 426) wieder dem kalten Ende des Hauptwärmetauschers (30) zugeführt wird.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß der Abkühlluftstrom (24) nach seiner Entnahme aus dem kalten Ende des Hauptwärmetauschers (30) einer Phasentrennung (301) unterworfen wird, wobei der erste Teilstrom (326, 426) mindestens durch einen Teil der aus der Phasentrennung (301) entnommenen Dampfphase gebildet wird.
- Verfahren nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß der Abkühlluftstrom (24) entspannt (25) wird, bevor er der Phasentrennung (301) unterworfen beziehungsweise als erster Teilstrom (26, 226) dem kalten Ende des Hauptwärmetauschers (30) zugeführt wird.
- Verfahren nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß der Abkühlluftstrom (24) in den ersten Teilstrom (226, 426) und in einen zweiten Teilstrom (201, 401) aufgeteilt wird, wobei der erste Teilstrom (226, 426) in das kalte Ende des Hauptwärmetauschers (30) eingeführt wird und der zweite Teilstrom (201, 401) ohne temperaturverändemde Maßnahmen mit dem ersten Teilstrom (228, 428) zwischen seiner Entnahme bei der ersten Zwischentemperatur und der Kaltverdichtung (29) zugeführt (203, 403) wird.
- Verfahren nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, daß der erste Teilstrom (331) stromabwärts der Kaltverdichtung (29) an einer Zwischenstelle des Hauptwärmetauschers (30), die einer zweiten Zwischentemperatur entspricht, dem Abkühlluftstrom (23, 24) zugeführt wird.
- Verfahren nach einem der Ansprüche 3 bis 7, dadurch gekennzeichnet, daß ein Turbinenluftstrom (23, 35) im Hauptwärmetauscher (30) auf eine dritte Zwischentemperatur abgekühlt und anschließend arbeitsleistend entspannt (36) wird, wobei mindestens ein Teil der bei der arbeitsleistenden Entspannung (36) erzeugten mechanischen Energie zum Antrieb der Kaltverdichtung (29) eingesetzt wird.
- Vorrichtung zur Tieftemperaturzerlegung von Luft miteinem Hauptwärmetauscher (30), der ein warmes und ein kaltes Ende aufweist, sowie Gruppen von Abkühl- und Anwärmpassagen aufweist, mitmindestens einer Rektifiziersäule (50), mit einerEinsatzluftleitung zur Zufuhr (9, 10, 20, 23) verdichteter und gereinigter Einsatzluft zu dem Hauptwärmetauscher (30) und zur Einspeisung (12, 33, 333) mindestens eines Teils der abgekühlten Einsatzluft in die Rektifiziersäule (50) undmit einer Kaltverdichtungsleitung (28, 228, 428), die von einer Zwischenstelle des Hauptwärmetauschers (30) zu einem Kaltverdichter (29) führt,
- Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß die Gruppe von Anwärmpassagen (27, 227) des Hauptwärmetauschers (30), die an der Zwischenstelle mit der Kaltverdichtungsleitung (28, 228, 428) verbunden sind, vom kalten Ende bis zu der Zwischenstelle durchgehend ausgebildet und am kalten Ende mit einer Gruppe von Abkühlpassagen verbunden (24, 26, 226, 326, 426) sind.
Applications Claiming Priority (2)
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DE19930731 | 1999-07-05 | ||
DE19930731 | 1999-07-05 |
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EP1067345A1 true EP1067345A1 (de) | 2001-01-10 |
EP1067345B1 EP1067345B1 (de) | 2004-06-16 |
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EP99121174A Expired - Lifetime EP1067345B1 (de) | 1999-07-05 | 1999-10-22 | Verfahren und Vorrichtung zur Tieftemperaturzerlegung von Luft |
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US (1) | US6336345B1 (de) |
EP (1) | EP1067345B1 (de) |
AT (1) | ATE269526T1 (de) |
DE (1) | DE59909750D1 (de) |
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FR2851330B1 (fr) * | 2003-02-13 | 2006-01-06 | Air Liquide | Procede et installation de production sous forme gazeuse et sous haute pression d'au moins un fluide choisi parmi l'oxygene, l'argon et l'azote par distillation cryogenique de l'air |
FR2854683B1 (fr) * | 2003-05-05 | 2006-09-29 | Air Liquide | Procede et installation de production de gaz de l'air sous pression par distillation cryogenique d'air |
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FR3062197B3 (fr) * | 2017-05-24 | 2019-05-10 | Air Liquide | Procede et appareil pour la separation de l'air par distillation cryogenique |
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WO2007145915A2 (en) * | 2006-06-09 | 2007-12-21 | Praxair Technology Inc. | Air separation method |
US7549301B2 (en) | 2006-06-09 | 2009-06-23 | Praxair Technology, Inc. | Air separation method |
WO2007145915A3 (en) * | 2006-06-09 | 2009-03-05 | Praxair Technology Inc | Air separation method |
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DE102007031765A1 (de) | 2007-07-07 | 2009-01-08 | Linde Ag | Verfahren zur Tieftemperaturzerlegung von Luft |
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DE102009034979A1 (de) | 2009-04-28 | 2010-11-04 | Linde Aktiengesellschaft | Verfahren und Vorrichtung zur Erzeugung von gasförmigem Drucksauerstoff |
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Also Published As
Publication number | Publication date |
---|---|
DE59909750D1 (de) | 2004-07-22 |
EP1067345B1 (de) | 2004-06-16 |
ATE269526T1 (de) | 2004-07-15 |
US6336345B1 (en) | 2002-01-08 |
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