EP1026464A1 - Air separation process by cryogenic distillation - Google Patents
Air separation process by cryogenic distillation Download PDFInfo
- Publication number
- EP1026464A1 EP1026464A1 EP00400235A EP00400235A EP1026464A1 EP 1026464 A1 EP1026464 A1 EP 1026464A1 EP 00400235 A EP00400235 A EP 00400235A EP 00400235 A EP00400235 A EP 00400235A EP 1026464 A1 EP1026464 A1 EP 1026464A1
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- European Patent Office
- Prior art keywords
- column
- passage
- gas
- installation
- exchange 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.)
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- 238000004821 distillation Methods 0.000 title claims abstract description 12
- 238000000926 separation method Methods 0.000 title claims description 12
- 239000007789 gas Substances 0.000 claims abstract description 59
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000001301 oxygen Substances 0.000 claims abstract description 32
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 23
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052786 argon Inorganic materials 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims description 47
- 238000002156 mixing Methods 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 230000008929 regeneration Effects 0.000 claims description 5
- 238000011069 regeneration method Methods 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims 1
- 239000002912 waste gas Substances 0.000 description 11
- 239000007788 liquid Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 230000001172 regenerating effect Effects 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 241000883306 Huso huso Species 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000008016 vaporization Effects 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
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04163—Hot end purification of the feed air
- F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
-
- 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
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04163—Hot end purification of the feed air
-
- 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
- F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low pressure column
-
- 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
- F25J3/0446—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 the heat generated by mixing two different phases
- F25J3/04466—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 the heat generated by mixing two different phases for producing oxygen as a mixing column overhead gas by mixing gaseous air feed and liquid oxygen
-
- 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
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/04—Processes or apparatus using separation by rectification in a dual pressure main column system
- F25J2200/06—Processes or apparatus using separation by rectification in a dual pressure main column system in a classical double column flow-sheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
-
- 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
- F25J2205/24—Processes or apparatus using other separation and/or other processing means using regenerators, cold accumulators or reversible heat exchangers
-
- 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
- F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
- F25J2235/50—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being oxygen
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S62/00—Refrigeration
- Y10S62/902—Apparatus
- Y10S62/908—Filter or absorber
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S62/00—Refrigeration
- Y10S62/902—Apparatus
- Y10S62/909—Regeneration
Definitions
- the present invention relates to a method and an installation for air separation by cryogenic distillation.
- the air can come from the exhaust of a turbine of detent as described in EP-A-698772: in this case, there is either a minimum oxygen pressure, i.e. a minimum production of liquid so that the whole is energetically optimal.
- US-A-5 802 872 describes the use of a brazed plate heat exchanger and a reversible exchanger to cool the air intended for the middle column pressure of a double column.
- WO 99/42773 published August 26, 1999 describes a method in which between 50 and 80% of the air intended for an air separation device is purified in water in regenerators and the rest of the air is purified by adsorption.
- An object of the invention is to reduce the investment costs of impure oxygen producing apparatus.
- the first air flow cools periodically and cyclically in at least a first pass of the system and in at least a third passage of the system. If the first air flow cools in at least one first pass of the system, the gas coming from a column of the installation warms up in at least one of the third passages. If the first flow air cools in at least a third pass of the system, at least part of the gas from a column in the installation regenerates the first passages and no longer circulates in at least part of the third passages.
- the heat exchange system may include a single exchange line or can include two exchange lines separated including a first in which the first air flow cools compressed and a second in which the second air flow cools compressed. At least one of the third passes (or the third pass) in which the gas flow from the installation is heated in the first exchange line. Possibly at least one of the third passages in which the flow of gas from the installation heats up may be in the second exchange line.
- the first flow can be lower than the second flow and, by preferably constitutes between 3 and 50% of the total air flow sent to the installation, especially between 10 and 40% of the total flow.
- At least part of the first air flow cooled in the exchanger can supply a column operating at a pressure of at least 0.5 bar more low than medium pressure.
- the column operating at a pressure of at least 0.5 lower than medium pressure bar is a mixing column, a column operating at an intermediate to medium and low pressure pressure or at the pressure of the low pressure column.
- a waste gas enriched in nitrogen from the lower column pressure and / or oxygen enriched gas from the mixing column or the low pressure column and / or an argon enriched gas from an argon column warms up periodically and cyclically in the first pass where cools the first flow.
- At least part of the first air flow can be drawn at a point intermediary of the exchange system, rather than at the cold end of it.
- the purification can be completely or partially eliminated upstream from the heat exchange system.
- the impure oxygen gas containing between 50 and 96 mol.% Of oxygen could serve to regenerate the first and / or second passage (s) and serve as a product while being charged water and CO 2 .
- a gas having this composition can supply a blast furnace. So the impure oxygen is not wasted.
- it comprises a mixing column, means to send liquid oxygen from the low pressure column to the column mixing and means for sending air from the exchange system thermal to the mixing column.
- the necessary frigories can be produced at least in part by an insufflation turbine supplied with air from the exchanger.
- FIG. 1 makes it possible to produce gaseous oxygen by a mixing column process in which the operating pressure of the mixing column 5 is lower than the operating pressure of column MP 1.
- the installation includes a medium pressure column 1, a column low pressure 3 thermally connected to it and a mixing column 5.
- the air 100 constituting between 30 and 50% of the air supplying the column of mixture 5 is compressed to a level close to the supply pressure of the oxygen 21 in the compressor 7.
- Said air flow 100 is introduced directly into a first passage A forming part of the main exchange line 11, without being treated beforehand in a decarbonation / desiccation system.
- this first passage A (or these first passages) and the third passage C can actually be in a exchanger and the second passage B and the third passage D can be find in another exchanger.
- valves 1A, 1C, 2D, 2B are open and the valves 1B, 1D, 2A, 2C are closed and the air cools in the first one or more passages A before being sent to the tank of the mixing column 5.
- the waste gas 17 is divided into two parts. A first part is sent to a third pass of the exchange system C (of the third exchange system passages) and the rest is sent to another third pass D of the exchange system (other passages of the system exchange) in the first phase.
- valves 1A, 1C, 2D, 2B are closed and the valves 1B, 1D, 2A, 2C are open and the first part of the waste gas, constituting between 30 and 40% of the air sent to the device, is sent to first passages A, normally occupied by the air which cools and the rest waste gas is always sent to the same passages as in operation normal.
- first passages A normally occupied by the air which cools and the rest waste gas is always sent to the same passages as in operation normal.
- the number of passages C will be equal to the number of passages A.
- the system goes back to the first phase and the air cools as before in the or the first passages A before being sent to the bottom of the column mixture 5.
- the waste gas 17 is divided into two parts. Again, a first part is sent to a third pass of the exchange system C (third passages of the trading system) and the rest is sent to another third pass D of the exchange system (others passages D of the exchange system).
- the waste gas will be used to regenerate the third passages C in which the air circulated during the second phase.
- the circuits A of the exchange line dedicated to this untreated air and in which therefore the water vapor and the carbon dioxide snow are deposited are cyclically regenerated by one of the gases coming from the distillation or mixing columns, and therefore substantially free impurities (i.e. free of water and CO 2 ) (reversible exchanger system).
- a residual gas from the low pressure column 3 can be sent either to regenerate the first pass of the exchanger or to a third pass where it heats up. While the regenerating gas circulates in the first passage, the first air flow cools in the third passage.
- At least a third pass C will be part of the first exchanger where the first air flow and at least a third cool down passage D will be part of the second exchanger where the second cools air flow.
- the air supplying the MP column is purified, either by a desiccation / décarbonatation 13, also by regenerating the second passage with a residual gas from the low pressure column (nitrogen or impure oxygen).
- the air purified in purification 13 is partially cooled in the second passage or second passages B, part is withdrawn from the exchanger, expanded in an insufflation turbine 15 and sent to the low pressure column 3; the rest of the air continues to cool in the second pass and is sent to the medium pressure column 1.
- Liquid oxygen pumped at below average pressure pressure supplies the head of the mixing column 5.
- Gaseous oxygen impure containing between 60 and 96 mol%. oxygen is drawn from the head of the mixing column and is sent to the heat exchange system 11 or to the second exchanger, if there is one, where it heats up.
- An intermediate liquid and a tank column liquid mixture are sent to the low pressure column.
- Rich liquid is sent from the medium pressure column to the low pressure column at the same level as the air from the blowing turbine.
- the first passage A is regenerated with all or part of the gas withdrawn at the head of the mixing column which contains at least 50% oxygen and preferably 80% oxygen which can be sent either to regenerate the first pass of the exchanger or to a third pass where it warms up. While the regenerating gas is circulating in the first pass (or the first passages), the first air flow is cools in the third pass (or third passes).
- the part of impure oxygen wet and charged with CO 2 is mixed with the rest of the gas and sent to a blast furnace or other installation consuming wet impure oxygen.
- At least two third passages are therefore preferably at least two third passages, at the less in the case of Figure 1.
- Preferably at least a third passage will be part of the first exchanger where the first air flow cools and at least a third passage will be part of the second exchanger where cools the second air flow.
- Figure 3 shows a simplified version of Figure 1 in which the first passages A and the third passages C are in a exchanger 11A and the second passages B, the heating passages of gaseous oxygen 21 and the third passages D are in a exchanger 11B.
- Figure 4 shows a simplified version of Figure 2 in which the first passages A, and the third passages C are in a exchanger 11A and the second passages and the heating passages of the waste gas 17 from the low pressure column is in an exchanger 11B.
- the air sent to the mixing column does not necessarily come from same compressor as the air intended for the medium pressure column.
- one of the flows can come from the blower of a blast furnace or the compressor of a gas turbine or other air source compressed.
- the invention is not limited to systems comprising a column mixture.
- the first air flow can for example be intended for the lower column pressure or intermediate pressure of a triple column of the Etienne or Ha type.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
Description
La présente invention concerne un procédé et une installation de séparation d'air par distillation cryogénique.The present invention relates to a method and an installation for air separation by cryogenic distillation.
En particulier il concerne les procédés de production d'oxygène gazeux contenant entre 60 et 96 mol.% d'oxygène.In particular, it relates to processes for the production of gaseous oxygen containing between 60 and 96 mol.% oxygen.
Il est connu de EP-A-229803 et US-A-4022030 d'utiliser un procédé à colonne de mélange pour produire de l'oxygène impur sous pression. Des variantes de ce procédé telles que celles décrites en EP-A-531182 distinguent les pressions de fonctionnement des colonnes moyenne pression et de mélange, et fait fonctionner la colonne de mélange à une pression inférieure ou supérieure à celle de la colonne moyenne pression. Ainsi l'air alimentant la cuve de la colonne de mélange peut provenir d'un étage intermédiaire du compresseur d'air principal; dans ce cas, deux systèmes de dessiccation/décarbonatation sont nécessaires, un sur chacun des deux faisceaux d'air.It is known from EP-A-229803 and US-A-4022030 to use a method for mixing column to produce impure oxygen under pressure. Of variants of this process such as those described in EP-A-531182 distinguish the operating pressures of the medium pressure and mixing, and operates the mixing column at a lower pressure or higher than that of the medium pressure column. Thus the air supplying the tank of the mixing column can come from an intermediate stage of the main air compressor; in this case two systems of desiccation / decarbonation are required, one on each of the two air bundles.
Alternativement l'air peut provenir de l'échappement d'une turbine de détente tel que décrit dans EP-A-698772: dans ce cas, il existe soit une pression minimale d'oxygène, soit une production de liquide minimale pour que l'ensemble soit énergétiquement optimal.Alternatively the air can come from the exhaust of a turbine of detent as described in EP-A-698772: in this case, there is either a minimum oxygen pressure, i.e. a minimum production of liquid so that the whole is energetically optimal.
US-A- 5 802 872 décrit l'usage d'un échangeur à plaques brasées et un échangeur réversible pour refroidir l'air destiné à la colonne moyenne pression d'une double colonne.US-A-5 802 872 describes the use of a brazed plate heat exchanger and a reversible exchanger to cool the air intended for the middle column pressure of a double column.
WO 99/42773 publiée le 26 août 1999 décrit un procédé dans lequel entre 50 et 80% de l'air destiné à un appareil de séparation d'air est épuré en eau dans des régénérateurs et le reste de l'air est épuré par adsorption.WO 99/42773 published August 26, 1999 describes a method in which between 50 and 80% of the air intended for an air separation device is purified in water in regenerators and the rest of the air is purified by adsorption.
Un but de l'invention est de réduire les coûts d'investissement des appareils de production d'oxygène impur.An object of the invention is to reduce the investment costs of impure oxygen producing apparatus.
Selon un objet de l'invention, il est prévu un procédé de séparation
d'air dans une installation de séparation d'air comprenant au moins deux
colonnes de distillation d'air dont une colonne moyenne pression et une
colonne basse pression dans lequel:
Ainsi le premier débit d'air se refroidit périodiquement et cycliquement dans au moins un premier passage du système et dans au moins un troisième passage du système. Si le premier débit d'air se refroidit dans au moins un premier passage du système, le gaz provenant d'une colonne de l'installation se réchauffe dans au moins un des troisièmes passages. Si le premier débit d'air se refroidit dans au moins un troisième passage du système, au moins une partie du gaz provenant d'une colonne de l'installation régénère le ou les premiers passages et ne circule plus dans au moins une partie des troisièmes passages.Thus the first air flow cools periodically and cyclically in at least a first pass of the system and in at least a third passage of the system. If the first air flow cools in at least one first pass of the system, the gas coming from a column of the installation warms up in at least one of the third passages. If the first flow air cools in at least a third pass of the system, at least part of the gas from a column in the installation regenerates the first passages and no longer circulates in at least part of the third passages.
Néanmoins si seulement une partie du gaz sert à régénérer les premiers passages d'air, le reste du gaz peut se réchauffer dans le ou les troisièmes passages non-utilisés par l'air.However if only part of the gas is used to regenerate the first air passages, the rest of the gas can heat up in the third passages not used by the air.
Il sera compris que le système d'échange thermique peut comporter une seule ligne d'échange ou peut comprendre deux lignes d'échange séparées dont une première dans laquelle se refroidit le premier débit d'air comprimé et une deuxième dans laquelle se refroidit le deuxième débit d'air comprimé. Au moins un des troisièmes passages (ou le troisième passage) dans lequel se réchauffe le débit de gaz provenant de l'installation se trouve dans la première ligne d'échange. Eventuellement au moins un des troisième passages dans lequel se réchauffe le débit de gaz provenant de l'installation peut se trouver dans la deuxième ligne d'échange.It will be understood that the heat exchange system may include a single exchange line or can include two exchange lines separated including a first in which the first air flow cools compressed and a second in which the second air flow cools compressed. At least one of the third passes (or the third pass) in which the gas flow from the installation is heated in the first exchange line. Possibly at least one of the third passages in which the flow of gas from the installation heats up may be in the second exchange line.
Dans le cas dans lequel seulement une partie du gaz sert à régénérer les premiers passages d'air, seulement ce gaz de régénération est envoyée à la première ligne d'échange, le reste du gaz pouvant se réchauffer dans le ou les troisièmes passages situé(s) dans la deuxième ligne d'échange.In the case where only part of the gas is used to regenerate the first air passages, only this regeneration gas is sent to the first exchange line, the rest of the gas being able to heat up in the or the third passages located in the second exchange line.
De préférence, on envoie le premier débit d'air dans le système d'échange thermique à une pression plus basse que celle à laquelle entre le deuxième débit.Preferably, we send the first air flow in the system heat exchange at a lower pressure than that at which the second flow.
Le premier débit peut être inférieur au deuxième débit et, de préférence, constitue entre 3 et 50% du débit d'air total envoyé à l'installation, notamment entre 10 et 40% du débit total.The first flow can be lower than the second flow and, by preferably constitutes between 3 and 50% of the total air flow sent to the installation, especially between 10 and 40% of the total flow.
Au moins une partie du premier débit d'air refroidi dans l'échangeur peut alimenter une colonne opérant à une pression au moins 0,5 bar plus basse que la moyenne pression.At least part of the first air flow cooled in the exchanger can supply a column operating at a pressure of at least 0.5 bar more low than medium pressure.
Selon une variante, la colonne opérant à une pression au moins 0,5 bar plus basse que la moyenne pression est une colonne de mélange, une colonne opérant à une pression intermédiaire à la moyenne et la basse pression ou à la pression de la colonne basse pression.Alternatively, the column operating at a pressure of at least 0.5 lower than medium pressure bar is a mixing column, a column operating at an intermediate to medium and low pressure pressure or at the pressure of the low pressure column.
De préférence, un gaz résiduaire enrichi en azote de la colonne basse pression et/ou un gaz enrichi en oxygène de la colonne de mélange ou la colonne basse pression et/ou un gaz enrichi en argon d'une colonne argon se réchauffe périodiquement et cycliquement dans le premier passage où se refroidit le premier débit.Preferably, a waste gas enriched in nitrogen from the lower column pressure and / or oxygen enriched gas from the mixing column or the low pressure column and / or an argon enriched gas from an argon column warms up periodically and cyclically in the first pass where cools the first flow.
Au moins une partie du premier débit d'air peut être soutiré à un point intermédiaire du système d'échange, plutôt qu'au bout froid de celui-ci.At least part of the first air flow can be drawn at a point intermediary of the exchange system, rather than at the cold end of it.
Soit seul le deuxième débit d'air (pas le premier débit) est épuré en eau et en CO2 , par exemple par des lits d'adsorbants, avant d'être refroidi dans l'échangeur, soit le(s) deuxième(s) passage(s) est (sont) également régénéré(s) par un gaz provenant de l'installation substantiellement dépourvu de toutes impuretés, par exemple de l'azote impur de la colonne basse pression. Dans ce cas, on peut supprimer complètement ou partiellement l'épuration en amont du système d'échange thermique.Either only the second air flow (not the first flow) is purified with water and CO 2 , for example by adsorbent beds, before being cooled in the exchanger, or the second (s) ) passage (s) is (are) also regenerated (s) by a gas coming from the installation substantially free of all impurities, for example impure nitrogen from the low pressure column. In this case, the purification can be completely or partially eliminated upstream from the heat exchange system.
Dans certains cas l'oxygène impur gazeux contenant entre 50 et 96 mol.% d'oxygène pourrait servir à régénérer le(s) premier(s) et/ou deuxième(s) passage(s) et servir de produit tout en étant chargé d'eau et de CO2. Par exemple, un gaz ayant cette composition peut alimenter un haut fourneau. Ainsi l'oxygène impur n'est pas gaspillé.In some cases the impure oxygen gas containing between 50 and 96 mol.% Of oxygen could serve to regenerate the first and / or second passage (s) and serve as a product while being charged water and CO 2 . For example, a gas having this composition can supply a blast furnace. So the impure oxygen is not wasted.
Selon un autre objet de l'invention, il est prévu une installation de séparation d'air par distillation cryogénique comprenant:
- au moins deux colonnes dont une colonne moyenne pression et une colonne basse pression,
- un système d'échange thermique,
- des moyens pour envoyer un premier débit d'air à un/des premier(s) passage(s) du système d'échange thermique sans l'épurer avant qu'il rentre dans le système d'échange thermique,
- des moyens pour envoyer un deuxième débit d'air à un/des deuxième(s) passage(s) du système d'échange thermique,
- des moyens pour envoyer un gaz de l'installation à un/des
troisième(s) passage(s) du système d'échange thermique où il se réchauffe,
caractérisée en ce qu'elle comprend des moyens pour envoyer au moins une partie du gaz de l'installation au(x) premier(s) passage(s) afin de le régénérer cycliquement et des moyens pour envoyer le premier débit d'air au/ à au moins un des troisième(s) passage(s).
- at least two columns including a medium pressure column and a low pressure column,
- a heat exchange system,
- means for sending a first air flow to one (s) first passage (s) of the heat exchange system without cleaning it before it enters the heat exchange system,
- means for sending a second air flow to one / of the second passage (s) of the heat exchange system,
- means for sending a gas from the installation to one / third passage (s) of the heat exchange system where it heats up,
characterized in that it comprises means for sending at least part of the gas from the installation to the first passage (s) in order to regenerate it cyclically and means for sending the first air flow to the / at least one of the third pass (s).
De préférence, elle comprend une colonne de mélange, des moyens pour envoyer de l'oxygène liquide de la colonne basse pression à la colonne de mélange et des moyens pour envoyer de l'air du système d'échange thermique à la colonne de mélange.Preferably, it comprises a mixing column, means to send liquid oxygen from the low pressure column to the column mixing and means for sending air from the exchange system thermal to the mixing column.
Les frigories nécessaires peuvent être produites au moins en partie par une turbine d'insufflation alimentée par de l'air de l'échangeur. The necessary frigories can be produced at least in part by an insufflation turbine supplied with air from the exchanger.
Selon une variante il y a des moyens pour envoyer de l'oxygène impur au(x) premier(s) passage(s) comme gaz de régénération, provenant éventuellement de la colonne de mélange ou de la colonne basse pression.According to a variant there are means for sending impure oxygen at the first pass (s) as regeneration gas, coming from optionally from the mixing column or from the low pressure column.
Il y a soit des moyens pour épurer le deuxième débit d'air avant de l'envoyer à l'échangeur soit des moyens pour envoyer le gaz de l'installation au(x) deuxième(s) passage(s) afin de le régénérer et ne comprenant pas de moyens pour épurer entièrement le deuxième débit d'air avant de l'envoyer à l'échangeur.There are either ways to purify the second air flow before send it to the exchanger or means to send the gas from the installation to the second passage (s) in order to regenerate it and not comprising any means for fully purifying the second air flow before sending it to the exchanger.
L'invention sera maintenant décrite plus en détails en se référant aux figures 1,2,3 et 4 qui sont des schémas d'installations selon l'invention.The invention will now be described in more detail with reference to Figures 1,2,3 and 4 which are diagrams of installations according to the invention.
Pour simplifier la description, on considère ici qu'il n'y qu'un seul premier passage d'air et un seul deuxième passage d'air. En réalité, il y aura probablement plusieurs passages remplissant le rôle de premiers passages et plusieurs passages remplissant le rôle de deuxièmes passagesTo simplify the description, we consider here that there is only one first air passage and only one second air passage. In reality, there will be probably several passages fulfilling the role of first passages and several passages fulfilling the role of second passages
Le procédé de la figure 1 permet de produire de l'oxygène gazeux par
un procédé à colonne de mélange dans lequel la pression de fonctionnement
de la colonne de mélange 5 est inférieure à la pression de fonctionnement de
la colonne MP 1.The process of FIG. 1 makes it possible to produce gaseous oxygen by
a mixing column process in which the operating pressure
of the
L'installation comprend une colonne moyenne pression 1, une colonne
basse pression 3 reliée thermiquement à celle-ci et une colonne de mélange 5.The installation includes a medium pressure column 1, a column
L'air 100 constituant entre 30 et 50% de l'air alimentant la colonne de
mélange 5 est comprimé à un niveau proche de la pression de fourniture de
l'oxygène 21 dans le compresseur 7.The
Le reste de l'air à distiller 200 constituant entre 40% et 60% de l'air est surpressé en 7 jusqu'a une valeur proche de ta pression de fonctionnement de la colonne moyenne pression 1.The rest of the air to be distilled 200 constituting between 40% and 60% of the air is overpressed in 7 to a value close to your operating pressure of the medium pressure column 1.
Ledit débit d'air 100 est introduit directement dans un premier passage
A faisant partie de la ligne d'échange principal 11, sans être traité au préalable
dans un système de décarbonatation/dessiccation.Said
Comme décrit précédemment, ce premier passage A (ou ces premiers passages) et le troisième passage C peuvent en fait se trouver dans un échangeur et le deuxième passage B et le troisième passage D peuvent se trouver dans un autre échangeur.As described above, this first passage A (or these first passages) and the third passage C can actually be in a exchanger and the second passage B and the third passage D can be find in another exchanger.
Dans une première phase, les vannes1A,1C,2D,2B sont ouvertes et les
vannes 1B,1D,2A,2C sont fermées et l'air se refroidit dans le ou les premiers
passages A avant d'être envoyé en cuve de la colonne de mélange 5.In a first phase, the
Le gaz résiduaire 17 est divisé en deux parties. Une première partie
est envoyée à un troisième passage du système d'échange C (des troisième
passages du système du système d'échange) et le reste est envoyé à un autre
troisième passage D du système d'échange (d'autres passages du système
d'échange) en première phase.The
Dans une deuxième phase, les vannes1A,1C,2D,2B sont fermées et
les vannes 1B,1D,2A,2C sont ouvertes et la première partie du gaz résiduaire,
constituant entre 30 et 40% de l'air envoyé à l'appareil, est envoyée aux
premiers passages A, normalement occupés par l'air qui se refroidit et le reste
du gaz résiduaire est toujours envoyé aux mêmes passages d qu'en marche
normale. De manière générale le nombre de passages C sera égal au nombre
de passages A.In a second phase, the
En même temps l'air destiné à la colonne de mélange est envoyé aux troisième passage C (troisièmes passages) libérés par le gaz résiduaire).At the same time the air intended for the mixing column is sent to the third passage C (third passages) released by the waste gas).
Une fois les passages A régénérés par le gaz résiduaire, le système
passe de nouveau à la première phase et l'air se refroidit comme avant dans le
ou les premiers passages A avant d'être envoyé en cuve de la colonne de
mélange 5.Once the passages A have been regenerated by the waste gas, the system
goes back to the first phase and the air cools as before in the
or the first passages A before being sent to the bottom of the
Le gaz résiduaire 17 est divisé en deux parties. De nouveau, une
première partie est envoyée à un troisième passage du système d'échange C
(des troisièmes passages du système du système d'échange) et le reste est
envoyé à un autre troisième passage D du système d'échange (d'autres
passages D du système d'échange).The
Ainsi en première phase, le gaz résiduaire servira à régénérer les troisièmes passages C dans lesquels l'air a circulé pendant la deuxième phase. Thus in the first phase, the waste gas will be used to regenerate the third passages C in which the air circulated during the second phase.
Les moyens nécessaires pour envoyer l'air soit aux passages A en première phase soit aux passages C en deuxième phase et pour envoyer le gaz résiduaire aux passages D en permanence et soit aux passages C en première phase soit aux passages A en deuxième phase sont illustrés et sont bien connus à l'homme de l'art familier avec l'art des échangeurs réversibles traité par exemple dans 'Tieftemperaturtechnik' de Hausen et Linde.The means necessary to send the air either to passages A in first phase either at passages C in second phase and to send the waste gas at passages D permanently and either at passages C in first phase or to passages A in second phase are illustrated and are well known to those skilled in the art familiar with the art of reversible exchangers treated for example in 'Tieftemperaturtechnik' by Hausen and Linde.
Les circuits A de la ligne d'échange dédiés à cet air non traité et dans
lequel se déposent donc la vapeur d'eau et la neige carbonique sont régénérés
cycliquement par un des gaz issus des colonnes de distillation ou de mélange,
et donc substantiellement dépourvu d'impuretés (c'est-à-dire exempts d'eau et
de CO2) (système d'échangeurs réversibles). Dans l'exemple un gaz résiduaire
de la colonne basse pression 3 peut être envoyé soit pour régénérer le premier
passage de l'échangeur soit à un troisième passage où il se réchauffe.
Pendant que le gaz régénérant circule dans le premier passage, le premier
débit d'air se refroidit dans le troisième passage.The circuits A of the exchange line dedicated to this untreated air and in which therefore the water vapor and the carbon dioxide snow are deposited are cyclically regenerated by one of the gases coming from the distillation or mixing columns, and therefore substantially free impurities (i.e. free of water and CO 2 ) (reversible exchanger system). In the example, a residual gas from the
De préférence au moins un troisième passage C fera partie du premier échangeur où se refroidit le premier débit d'air et au moins un troisième passage D fera partie du deuxième échangeur où se refroidit le deuxième débit d'air.Preferably at least a third pass C will be part of the first exchanger where the first air flow and at least a third cool down passage D will be part of the second exchanger where the second cools air flow.
Ainsi les troisièmes passages D toujours alimentés en gaz résiduaire peuvent être dans le deuxième échangeur tandis que ceux C qui reçoivent de l'air en phase d'épuration peuvent être dans le premier échangeur (voir pointillés dans les Figures 1 et 2).Thus the third passages D always supplied with waste gas can be in the second exchanger while those C which receive the air in the purification phase can be in the first exchanger (see dotted in Figures 1 and 2).
L'air alimentant la colonne MP est épuré, soit par un système de
dessiccation/décarbonatation 13, soit également en régénérant le deuxième
passage avec un gaz résiduaire de la colonne basse pression (azote ou
oxygène impur).The air supplying the MP column is purified, either by a
desiccation /
L'air épuré dans l'épuration 13 est partiellement refroidi dans le
deuxième passage ou des deuxièmes passages B, une partie est soutirée de
l'échangeur, détendue dans une turbine d'insufflation 15 et envoyée à la
colonne basse pression 3; le reste de l'air poursuit son refroidissement dans le
deuxième passage et est envoyé à la colonne moyenne pression 1.The air purified in
De l'oxygène liquide pompé à une pression inférieure à la moyenne
pression alimente la tête de la colonne de mélange 5. De l'oxygène gazeux
impur contenant entre 60 et 96 mol %. d'oxygène est soutiré de la tête de la
colonne de mélange et est envoyé au système d'échange thermique 11 ou au
deuxième échangeur, s'il y en a un, où il se réchauffe.Liquid oxygen pumped at below average pressure
pressure supplies the head of the
Un liquide intermédiaire et un liquide de cuve de la colonne de mélange sont envoyés à la colonne basse pression.An intermediate liquid and a tank column liquid mixture are sent to the low pressure column.
Du liquide riche est envoyé de la colonne moyenne pression a la colonne basse pression au même niveau que l'air de la turbine d'insufflation.Rich liquid is sent from the medium pressure column to the low pressure column at the same level as the air from the blowing turbine.
Du liquide pauvre est envoyé de la tête de la colonne moyenne pression à la tête de la colonne basse pression.Poor liquid is sent from the top of the middle column pressure at the head of the low pressure column.
Dans la variante de la figure 2, le premier passage A est régénéré avec tout ou une partie du gaz soutiré en tête de la colonne de mélange qui contient au moins 50 % d'oxygène et de préférence 80 % d'oxygène qui peut être envoyé soit pour régénérer le premier passage de l'échangeur soit à un troisième passage où il se réchauffe. Pendant que le gaz régénérant circule dans le premier passage (ou les premiers passages), le premier débit d'air se refroidit dans le troisième passage (ou les troisièmes passages).In the variant of FIG. 2, the first passage A is regenerated with all or part of the gas withdrawn at the head of the mixing column which contains at least 50% oxygen and preferably 80% oxygen which can be sent either to regenerate the first pass of the exchanger or to a third pass where it warms up. While the regenerating gas is circulating in the first pass (or the first passages), the first air flow is cools in the third pass (or third passes).
Après la régénération la partie d'oxygène impur humide et chargé de CO2 est mélangée avec le reste du gaz et envoyée à un haut fourneau ou autre installation consommatrice d'oxygène impur humide.After the regeneration, the part of impure oxygen wet and charged with CO 2 is mixed with the rest of the gas and sent to a blast furnace or other installation consuming wet impure oxygen.
Il y a donc de préférence au moins deux troisièmes passages, au moins dans le cas de la Figure 1. De préférence au moins un troisième passage fera partie du premier échangeur où se refroidit le premier débit d'air et au moins un troisième passage fera partie du deuxième échangeur où se refroidit le deuxième débit d'air.There are therefore preferably at least two third passages, at the less in the case of Figure 1. Preferably at least a third passage will be part of the first exchanger where the first air flow cools and at least a third passage will be part of the second exchanger where cools the second air flow.
Dans les Figures 3 et 4 le premier débit d'air est soutiré de l'échangeur
11A en amont du bout froid de celui-ci. Les vannes régulant les débits d'air et
de gaz de l'appareil illustrées dans les Figures 1 et 2 ne sont pas montrées
dans les Figures 3 et 4 par souci de simplification.In Figures 3 and 4 the first air flow is withdrawn from the
La Figure 3 montre une version simplifiée de la Figure 1 dans lequel
les premiers passages A et les troisièmes passages C se trouvent dans un
échangeur 11A et les deuxièmes passages B, les passages de réchauffage
d'oxygène gazeux 21 et les troisièmes passages D se trouvent dans un
échangeur 11B.Figure 3 shows a simplified version of Figure 1 in which
the first passages A and the third passages C are in a
La Figure 4 montre une version simplifiée de la Figure 2 dans lequel
les premiers passages A, et les troisièmes passages C se trouvent dans un
échangeur 11A et les deuxièmes passages et les passages de réchauffage du
gaz résiduaire 17 de la colonne basse pression se trouvent dans un échangeur
11B.Figure 4 shows a simplified version of Figure 2 in which
the first passages A, and the third passages C are in a
Les modifications suivantes peuvent être envisagées entre autres:
- production d'une partie de l'oxygène à une pureté supérieure à 98 % à partir de la colonne basse pression, sous forme liquide ou gazeuse, sous pression ou non
- usage d'une turbine Claude ou turbine azote, éventuellement produisant au moins une fraction liquide
- opération de la colonne basse pression à une pression au-dessus de 1,5 bar
- usage d'une ou plusieurs colonnes d'argon alimentée(s) à partir de la colonne basse pression; dans ce cas au moins une partie du gaz de régénération peut être constituée par un gaz enrichi en argon
- production de liquide comme produit final
- vaporisation d'un liquide de la colonne ou d'une source extérieure dans la ligne d'échange
- opération de la colonne de mélange à une pression égale à ou supérieure à la moyenne pression
- usage du gaz qui a régénéré le premier ou deuxième passage comme produit, par exemple oxygène impur humide
- détente d'air destiné à la colonne de mélange dans une turbine.
- production of part of the oxygen at a purity greater than 98% from the low pressure column, in liquid or gaseous form, under pressure or not
- use of a Claude turbine or nitrogen turbine, possibly producing at least one liquid fraction
- low pressure column operation at a pressure above 1.5 bar
- use of one or more columns of argon supplied from the low pressure column; in this case at least part of the regeneration gas can be constituted by a gas enriched in argon
- production of liquid as final product
- vaporization of a liquid from the column or from an external source in the exchange line
- operation of the mixing column at a pressure equal to or greater than the medium pressure
- use of the gas which regenerated the first or second pass as a product, for example wet impure oxygen
- air expansion for the mixing column in a turbine.
L'air envoyé à la colonne de mélange ne vient pas obligatoirement du même compresseur que l'air destiné à la colonne moyenne pression.The air sent to the mixing column does not necessarily come from same compressor as the air intended for the medium pressure column.
En particulier un des débits peut provenir de la soufflante d'un hautfourneau ou du compresseur d'une turbine à gaz ou d'une autre source d'air comprimé.In particular, one of the flows can come from the blower of a blast furnace or the compressor of a gas turbine or other air source compressed.
L'invention n'est pas restreinte aux systèmes comprenant une colonne de mélange.The invention is not limited to systems comprising a column mixture.
Le premier débit d'air peut par exemple être destiné à la colonne basse pression ou pression intermédiaire d'une triple colonne du type Etienne ou Ha.The first air flow can for example be intended for the lower column pressure or intermediate pressure of a triple column of the Etienne or Ha type.
Claims (25)
caractérisé en ce que:
on envoie périodiquement et cycliquement en deuxième phase au moins une partie du débit de gaz provenant de l'installation au(x) premier(s) passage(s) pour le(s) régénérer et,
le premier débit d'air est alors renvoyé dans le/au moins un des troisième(s) passage(s) (C) du système d'échange thermique, alors libéré(s) par le gaz provenant de l'installation et substantiellement dépourvu(s) de toutes impuretés.
characterized in that:
at least part of the gas flow from the installation is sent periodically and cyclically in the second phase to the first passage (s) to regenerate it and,
the first air flow is then returned to / at least one of the third passage (s) (C) of the heat exchange system, then released (s) by the gas coming from the installation and substantially free (s) of all impurities.
caractérisée en ce qu'elle comprend des moyens (1A à 1D, 2A à 2D) pour envoyer le gaz de l'installation au(x) premier(s) passage(s) (A) en deuxième phase afin de le régénérer cycliquement et des moyens (1A à 1D, 2A à 2D) pour envoyer le premier débit d'air au troisième passage/à au moins un des troisièmes passages (C) en deuxième phase.
characterized in that it comprises means (1A to 1D, 2A to 2D) for sending the gas from the installation to the first passage (s) (A) in the second phase in order to regenerate it cyclically and means (1A to 1D, 2A to 2D) for sending the first air flow at the third pass / to at least one of the third passages (C) in the second phase.
caractérisé en ce que l'on régénère le(s) premier(s) passage(s) en y envoyant au moins une partie du débit gazeux comprenant au moins 50 % d'oxygène.
characterized in that the first passage (s) are regenerated by sending therein at least part of the gas flow comprising at least 50% oxygen.
caractérisée en ce qu'elle comprend des moyens pour envoyer un gaz contenant au moins 50 mol.% d'oxygène provenant d'une des colonnes au(x) passage(s) où se refroidit l'air afin de le régénérer et des moyens pour envoyer l'air au deuxième passage(au moins un des autres passages).
characterized in that it comprises means for sending a gas containing at least 50 mol.% of oxygen coming from one of the columns to the passage (s) where the air cools in order to regenerate it and means to send the air to the second pass (at least one of the other passages).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9901097 | 1999-02-01 | ||
| FR9901097A FR2789162B1 (en) | 1999-02-01 | 1999-02-01 | PROCESS FOR SEPARATING AIR BY CRYOGENIC DISTILLATION |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1026464A1 true EP1026464A1 (en) | 2000-08-09 |
Family
ID=9541435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00400235A Withdrawn EP1026464A1 (en) | 1999-02-01 | 2000-01-31 | Air separation process by cryogenic distillation |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6295835B1 (en) |
| EP (1) | EP1026464A1 (en) |
| JP (1) | JP2000230776A (en) |
| CA (1) | CA2297475A1 (en) |
| FR (1) | FR2789162B1 (en) |
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|---|---|---|---|---|
| EP2400249A1 (en) * | 2010-06-25 | 2011-12-28 | L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Air separation method and facility for cryogenic distilling |
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|---|---|---|---|---|
| FR2854579B1 (en) * | 2003-05-09 | 2005-06-17 | Air Liquide | DISTILLATION PLANT COMPRISING COLUMNS WITH CORRUGATED-CROSS STRUCTURES AND METHOD OF INCREASING THE CAPACITY OF A DISTILLATION FACILITY |
| FR2861841B1 (en) * | 2003-11-04 | 2006-06-30 | Air Liquide | METHOD AND APPARATUS FOR AIR SEPARATION BY CRYOGENIC DISTILLATION |
| FR2862128B1 (en) * | 2003-11-10 | 2006-01-06 | Air Liquide | PROCESS AND INSTALLATION FOR SUPPLYING HIGH-PURITY OXYGEN BY CRYOGENIC AIR DISTILLATION |
| CN103109145B (en) * | 2009-11-23 | 2015-10-14 | 乔治洛德方法研究和开发液化空气有限公司 | For compressing the method and apparatus with cooling-air |
| US8528363B2 (en) * | 2009-12-17 | 2013-09-10 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process and apparatus for the separation of air by cryogenic distillation |
| CN115574541B (en) * | 2021-06-21 | 2025-05-09 | 中国石油天然气集团有限公司 | A low-energy consumption ultra-high pressure air separation oxygen and nitrogen production system and method |
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| FR1426146A (en) * | 1963-03-29 | 1966-01-28 | Lindes Eismaschinen Ag | Process for the production of oxygen, installation for carrying out the process and products conforming to those obtained by the present process or similar process |
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| EP0531182A1 (en) * | 1991-08-07 | 1993-03-10 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process and plant for distilling air and application in the feeding of gas to steel plants |
| US5471843A (en) * | 1993-06-18 | 1995-12-05 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process and installation for the production of oxygen and/or nitrogen under pressure at variable flow rate |
| EP0698772A1 (en) * | 1994-08-25 | 1996-02-28 | The Boc Group, Inc. | Method and apparatus for producing oxygen |
| EP0757217A1 (en) * | 1995-08-03 | 1997-02-05 | The BOC Group plc | Air separation |
| US5778700A (en) * | 1997-04-30 | 1998-07-14 | The Boc Group, Inc. | Method of producing gaseous oxygen at variable rate |
| US5802872A (en) * | 1997-07-30 | 1998-09-08 | Praxair Technology, Inc. | Cryogenic air separation with combined prepurifier and regenerators |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA785475A (en) * | 1968-05-21 | Jakob Fritz | Process for heat exchange or for heat exchange and cleansing of gases in periodically reversible regenerators | |
| US4131155A (en) * | 1975-01-28 | 1978-12-26 | Air Products And Chemicals, Inc. | Reversible heat exchanger or regenerator systems |
| JPS51111950A (en) * | 1975-03-28 | 1976-10-02 | Kobe Steel Ltd | Temperature control method of a change-over type heat exchanger for ai r separator |
| JPS6019439B2 (en) * | 1981-12-25 | 1985-05-16 | 株式会社日立製作所 | Temperature control method for switching heat exchanger group |
| US5740683A (en) * | 1997-03-27 | 1998-04-21 | Praxair Technology, Inc. | Cryogenic rectification regenerator system |
-
1999
- 1999-02-01 FR FR9901097A patent/FR2789162B1/en not_active Expired - Fee Related
-
2000
- 2000-01-28 CA CA002297475A patent/CA2297475A1/en not_active Abandoned
- 2000-01-31 JP JP2000022563A patent/JP2000230776A/en active Pending
- 2000-01-31 EP EP00400235A patent/EP1026464A1/en not_active Withdrawn
- 2000-02-01 US US09/495,701 patent/US6295835B1/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1117616B (en) * | 1960-10-14 | 1961-11-23 | Linde Eismasch Ag | Method and device for obtaining particularly pure decomposition products in cryogenic gas separation plants |
| FR1426146A (en) * | 1963-03-29 | 1966-01-28 | Lindes Eismaschinen Ag | Process for the production of oxygen, installation for carrying out the process and products conforming to those obtained by the present process or similar process |
| EP0229803A1 (en) * | 1985-07-15 | 1987-07-29 | Air Liquide | Process and plant for the distillation of air. |
| EP0531182A1 (en) * | 1991-08-07 | 1993-03-10 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process and plant for distilling air and application in the feeding of gas to steel plants |
| US5471843A (en) * | 1993-06-18 | 1995-12-05 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process and installation for the production of oxygen and/or nitrogen under pressure at variable flow rate |
| EP0698772A1 (en) * | 1994-08-25 | 1996-02-28 | The Boc Group, Inc. | Method and apparatus for producing oxygen |
| EP0757217A1 (en) * | 1995-08-03 | 1997-02-05 | The BOC Group plc | Air separation |
| US5778700A (en) * | 1997-04-30 | 1998-07-14 | The Boc Group, Inc. | Method of producing gaseous oxygen at variable rate |
| US5802872A (en) * | 1997-07-30 | 1998-09-08 | Praxair Technology, Inc. | Cryogenic air separation with combined prepurifier and regenerators |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2400249A1 (en) * | 2010-06-25 | 2011-12-28 | L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Air separation method and facility for cryogenic distilling |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2789162A1 (en) | 2000-08-04 |
| FR2789162B1 (en) | 2001-11-09 |
| JP2000230776A (en) | 2000-08-22 |
| CA2297475A1 (en) | 2000-08-01 |
| US6295835B1 (en) | 2001-10-02 |
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