EP0949471B1 - Cryogenic air separation plant with two different operation modes - Google Patents

Cryogenic air separation plant with two different operation modes Download PDF

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Publication number
EP0949471B1
EP0949471B1 EP19990106715 EP99106715A EP0949471B1 EP 0949471 B1 EP0949471 B1 EP 0949471B1 EP 19990106715 EP19990106715 EP 19990106715 EP 99106715 A EP99106715 A EP 99106715A EP 0949471 B1 EP0949471 B1 EP 0949471B1
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EP
European Patent Office
Prior art keywords
air
pressure
liquid
refrigeration
product
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.)
Expired - Lifetime
Application number
EP19990106715
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German (de)
French (fr)
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EP0949471A1 (en
Inventor
Jürgen Dipl.-Phys. Voit
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Linde Gas AG
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Linde AG
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Publication date
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Priority to DE1998115885 priority Critical patent/DE19815885A1/en
Priority to DE19815885 priority
Priority to EP98112276 priority
Priority to EP98112276 priority
Application filed by Linde AG filed Critical Linde AG
Priority to EP19990106715 priority patent/EP0949471B1/en
Publication of EP0949471A1 publication Critical patent/EP0949471A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes 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
    • F25J3/04Processes 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
    • F25J3/04763Start-up or control of the process; Details of the apparatus used
    • F25J3/04866Construction and layout of air fractionation equipments, e.g. valves, machines
    • F25J3/04951Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network
    • F25J3/04957Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network and inter-connecting equipments upstream of the fractionation unit (s), i.e. at the "front-end"
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes 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
    • F25J3/04Processes 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
    • F25J3/04006Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04012Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
    • F25J3/04018Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of main feed air
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    • F25J3/04024Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of purified feed air, so-called boosted air
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    • F25J3/04084Providing 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 nitrogen
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    • F25J3/0409Providing 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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    • F25J3/04006Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04109Arrangements of compressors and /or their drivers
    • F25J3/04145Mechanically coupling of different compressors of the air fractionation process to the same driver(s)
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    • F25J3/04248Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284Generation 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
    • F25J3/0429Generation 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
    • F25J3/04296Claude expansion, i.e. expanded into the main or high pressure column
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    • F25J3/04333Generation 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
    • F25J3/04339Generation 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
    • F25J3/04345Generation 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 and comprising a gas work expansion loop
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    • F25J3/04436Processes 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 at least a triple pressure main column system
    • F25J3/04448Processes 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 at least a triple pressure main column system in a double column flowsheet with an intermediate pressure column
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2235/00Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/42Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being nitrogen
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2240/00Processes or apparatus involving steps for expanding of process streams
    • F25J2240/40Expansion without extracting work, i.e. isenthalpic throttling, e.g. JT valve, regulating valve or venturi, or isentropic nozzle, e.g. Laval
    • F25J2240/42Expansion without extracting work, i.e. isenthalpic throttling, e.g. JT valve, regulating valve or venturi, or isentropic nozzle, e.g. Laval the fluid being air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2290/00Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/62Details of storing a fluid in a tank
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S62/00Refrigeration
    • Y10S62/90Triple column

Description

Die Erfindung betrifft ein Verfahren zur Erzeugung von gasförmigem Druckprodukt durch Tieftemperaturzerlegung von Luft, das zeitweise in einem Gasbetrieb und zeitweise in einem kombinierten Betrieb betrieben wird. The invention relates to a method for producing gaseous pressurized product by low-temperature fractionation of air, which is temporarily operated in a gas mode and at times in a combined operation.

Die Erfindung betrifft außerdem eine Vorrichtung zur Durchführung dieses Verfahrens. The invention also relates to an apparatus for performing this method.

Aus der Schrift EP 0 044 679 A1 ist ein Verfahren zur Erzeugung von gasförmigem Drucksauerstoff (DGOX) und geringer Mengen Flüssigsauerstoff (LOX) bekannt: Kälte für die Luftzerlegung und die Erzeugung von Flüssigprodukt liefert ein Luftkältekreislauf. From document EP 0044679 A1 a method for the production of gaseous oxygen under pressure is (DGOX) and small quantities of liquid oxygen (LOX) is known: refrigeration for the air separation and the production of liquid product provides an air refrigeration cycle. Er enthält eine Verdichtung mit zwei Kompressorstufen in Serie zur Verdichtung eines Luftstromes in der ersten Stufe auf einen mittleren Druck für eine arbeitsleistende Entspannung eines Teilstromes dieser Luft auf einen unteren Druck und eine zweite Kompressorstufe zur Verdichtung des restlichen Luftstromes auf einen höheren Druck für eine Drosselentspannung auf den gleichen niedrigen Druck. It contains a compaction with two compressor stages in series for compressing a flow of air in the first stage to an intermediate pressure for a work-performing expansion of a partial flow of this air to a lower pressure and a second compressor stage for compressing the remaining air stream to a higher pressure for a throttling expansion to the same low pressure. Nach Zusammenführung der Teilströme und Abzweigen einer gebildeten Flüssigphase wird die Gasphase zur Verdichtung rezykliert und die Flüssigphase nach Aufteilung in zwei Drosselströme einer Rektifikation zugeführt. After merging of the partial currents and branches of a liquid phase formed, the gas phase is recycled for compression and supplied to the liquid phase after being divided into two inductor currents to rectification. Der Kältekreislauf kann bei einem solchen Verfahren nicht abgeschaltet werden und ein Zurückfahren der Kälteleistung führt zu einem energetisch ungünstigen Betrieb. The refrigerant circuit can not be switched off and a retraction of the cooling capacity results in an energetically unfavorable operating in such a method.

Aufgabe der Erfindung ist ein Verfahren und eine Vorrichtung der eingangs genannten Art mit einer energetisch günstigen Erzeugung des gasförmigen Druckprodukts und des Flüssigprodukts jeweils in variablen Mengen und bei hoher Verfügbarkeit der Erzeugung des Druckprodukts. The object of the invention is a method and an apparatus of the type mentioned with an energetically favorable production of the gaseous pressure product and the liquid product each in variable amounts and with high availability of production of the printed product.

Diese Aufgabe wird erfindungsgemäß gelöst von einem Verfahren mit den Merkmalen des Anspruchs 1 und von einer Vorrichtung mit den Merkmalen des Anspruchs 8. Ausführungen der Erfindung sind Gegenstand von Unteransprüchen. This object is inventively achieved by a method having the features of claim 1 and by an apparatus having the features of claim 8. Embodiments of the invention are subject matter of subclaims.

Kennzeichnend an dem erfindungsgemäßen Verfahren ist, daß beim Gasbetrieb der Luftdurchsatz im Kältekreislauf auf Null reduziert wird und zu einer Kompensation von Kälteverlusten, die nicht mehr durch den Kältekreislauf gedeckt werden, tiefkalte gespeicherte Flüssigkeit verwendet wird. It is characteristic of the inventive process that in the gas mode the air throughput in the refrigeration circuit is reduced to zero and a compensation of cold losses which are no longer covered by the refrigeration circuit, cryogenic stored liquid is used. Dies ermöglicht die Erzeugung von gasförmigem Druckprodukt auch bei vollem Flüssigprodukttank, indem beispielsweise gespeichertes Flüssigprodukt in einem Wärmeaustauscher im Gegenstrom zur eingesetzten Luft geführt wird, diese Luft dabei abgekühlt, teilweise verflüssigt und der Rektifikation zugeführt wird oder indem gespeicherte Flüssigkeit direkt der Rektifikation zugeführt wird. This allows the production of pressurized gaseous product even at full liquid product tank, for example by stored liquid product is conducted in a heat exchanger in counterflow to the used air, cooling this air thereby partially liquefied and the rectification is supplied or by stored liquid is fed directly to the rectification.

Tiefkalte Flüssigkeit mindestens einer flüssigen Fraktion aus der Rektifikation, beispielsweise Flüssigstickstoff (LIN), Flüssigsauerstoff (LOX) oder flüssige Luft, zur Kompensation von Kälteverlusten im Gasbetrieb kann in einem Tank zwischengespeichert werden, wobei als Tank zum Speichern dieser Fraktionen Pufferbehälter und/oder Produkttanks verwendet werden. Cryogenic liquid is at least a liquid fraction from the rectification, for example liquid nitrogen (LIN), liquid oxygen (LOX) or liquid air, to compensate for refrigeration losses in gas operation can be temporarily stored in a tank being used as the tank for storing these fractions buffer container and / or product tanks become. Meist ist die Nutzung von Produkttanks die günstigste Lösung, während flüssige Luft eher einen Pufferbehälter erfordert, da flüssige Luft als Produkt meist keine Rolle spielt. In most cases the use of product tank is the best solution, while liquid air rather requires a buffer tank as liquid air usually does not matter as the product.

Zeitweise kann unter Verwendung mindestens zweier Tanks eine Wechselspeicherung vorgenommen werden, wobei einerseits bei erhöhtem Drucksauerstoff (DGOX)-Bedarf zusätzlich zum LOX aus der Rektifikation aus dem einen Tank zwischengespeichertes LOX entnommen, verdichtet, im Gegenstrom verdampft und angewärmt und dann als DGOX-Produkt abgeben wird und hierbei im Gegenstrom Kälte zurückgewonnen und zur Erzeugung und Zwischenspeicherung von LIN-Produkt verwendet wird, wobei andererseits bei niedrigem DGOX-Bedarf entsprechend wenig LOX aus dem Rektifiziersystem als DGOX abgegeben und dafür mehr LOX zwischengespeichert wird. At times, may be implemented using at least two tanks a currency storage are carried out, on the one hand at elevated pressure oxygen (DGOX) -bedarf removed in addition to the LOX from the rectification of said one tank is temporarily stored LOX, compressed, evaporated in countercurrent and heated up and then deliver as DGOX product and this is recovered refrigerant in counter-current and is used for the generation and storage of LIN product, on the other hand leave at low DGOX requirement correspondingly little LOX from the rectification system as DGOX and for more LOX is temporarily stored. Der Vorteil besteht darin, daß zeitweise mehr DGOX geliefert wird als nach Auslegung der Luftzerlegung möglich wäre, indem gespeichertes LOX entnommen und dem Kälteinhalt des LOX entsprechend LIN gespeichert wird. The advantage is that occasionally more DGOX is supplied than would be possible on the design of the air separation by extracting stored LOX and LIN is stored corresponding to the cold content of the LOX.

Zur Rektifikation kann ein Zweisäulenverfahren eingesetzt werden, wobei eine Kopfkühlung der Drucksäule mit einer Zwischenflüssigkeit aus einer Niederdrucksäule bewerkstelligt und eine Sumpfheizung der Niederdrucksäule durch indirekten Wärmeaustausch mit Luft vorgenommen wird. For rectification, a two-column method can be used, wherein a head cooling of the pressure column accomplished with an intermediate liquid from a low-pressure column and a sump heating of the low-pressure column is effected by indirect heat exchange with air. Das Zweisäulenverfahren ist aus DE 196 09 490 A1 bekannt und eignet sich besonders, wenn nur eine geringe Sauerstoffreinheit erforderlich ist. The two-column method is known from DE 196 09 490 A1 and is especially useful when only a small oxygen purity is required.

Als Rektifiziersystem kann alternativ auch ein Dreisäulenverfahren eingesetzt werden, wobei eine Doppelsäule mit einem Hochdruckteil und einem Niederdruckteil und eine Zusatzsäule unter Zwischendruck eingesetzt wird. As rectifying a three-column process can be used as an alternative, a double column with a high pressure part and a low-pressure part and an additional column under intermediate pressure is used. Das Dreisäulenverfahren ist aus DE 195 37 913 A1 bekannt. The three-column process is known from DE 195 37 913 A1. Auch bei Sauerstoffreinheiten > 99,5 mol % sind mit diesem Verfahren Energieeinsparungen möglich. Even when oxygen purity> 99.5 mol% energy savings are possible with this method.

Bei der Gewinnung von gasförmigem Druckprodukt durch Verdampfen und Anwärmen von Flüssigkeit unter Druck, auch Innenverdichtung genannt, im Gegenstrom mit warmer Luft, kann Luft auf dem oberen Druckniveau der Verdichtung im Kältekreislauf verwendet werden oder solche, die von diesem Druckniveau ausgehend nachverdichtet wird. In the recovery of a gaseous pressurized product by vaporization and heating of liquid under pressure, including internal compression, called counter-current with warm air, air may be used or those which is post starting from this pressure level to the upper pressure level of the compression in the refrigerant circuit.

Die arbeitsleistende Entspannung kann in mindestens einer Kälteturbine erfolgen, wobei die Leistung an der Welle einer solchen Turbine zum Antrieb entweder eines stromerzeugenden Generators oder eines Boosters verwendet wird, wobei der Booster beispielsweise zum Nachverdichten der Luft im Kältekreislauf eingesetzt wird. The work-performing expansion can take place in at least one refrigeration turbine, the power at the shaft of such a turbine to drive either a current-generating generator or a booster is used, wherein the booster is for example used for recompression of the air in the refrigeration cycle. In beiden Fällen wird die Energie der Kälteturbine günstig genutzt. In both cases, the energy of the cold turbine is used favorably.

Kennzeichnend an der erfindungsgemäßen Vorrichtung ist, daß die Verdichterstation mit mindestens zwei parallel angeordneten Verdichtem ausgeführt ist, die so ausgelegt sind, daß im Gasbetrieb nur einer der Verdichter in Betrieb ist, wobei dieser Verdichter Drosselluft liefert und der Kältekreislauf nicht mit Luft beaufschlagt ist, während im Betrieb mit Erzeugung von Druckprodukt und Flüssigprodukt mindestens zwei parallel angeordnete Verdichter in Betrieb sind und zusätzlich zum Liefern von Drosselluft auch der Kältekreislauf mit Luft beaufschlagt ist. It is characteristic of the inventive device is that the compressor station is designed with at least two parallel Verdichtem which are designed such that, in gas mode, only one of the compressors is operating, this compressor supplying throttle air and the refrigerant circuit is not supplied with air, while at least two parallel compressors are in operation in operation with production of pressurized product and liquid product and, in addition to providing the throttle air and the refrigerant circuit is charged with air. Eine solche Verdichterstation besitzt mehrere Vorteile. Such a compressor station has several advantages. Für den Gasbetrieb wird ein Verdichter an seinem energetisch günstigsten Betriebspunkt, bei zusätzlicher Erzeugung von Flüssigprodukt werden mehrere, beispielsweise zwei Verdichter nahe ihrem optimalen Betriebspunkt eingesetzt. For gas operation a compressor at its energetically most favorable operating point is in the production of additional liquid product to be several, for example two compressors used near its optimum operating point. Mit mehreren Verdichtem wird außerdem gleichzeitig eine Maschinenredundanz geschaffen, die die Versorgungssicherheit im Gasbetrieb entsprechend erhöht. With multiple redundancy Verdichtem also a machine is provided at the same time, which increases the security of supply in gas operation accordingly. Ein weiterer Vorteil der Erfindung besteht darin, daß mit einem Verdichter, als Kreislaufverdichter betrieben, auch energetisch günstig Flüssigprodukt erzeugt werden kann und daß dieser Flüssigbetrieb durch die Maschinenredundanz ebenfalls mit hoher Versorgungssicherheit ermöglicht wird. Another advantage of the invention is that, operated by a compressor and cycle compressor, also energetically favorable liquid product can be produced and that this liquid operation is also possible by the equipment redundancy with high security of supply.

Die Kälteturbine im Leitungsstrang des Kältekreislaufs kann als Turbinen/Generator-Einheit ausgebildet sein. The cold turbine in the cable portion of the refrigeration cycle can be designed as a turbine / generator unit. Die in der Kälteturbine gewonnene Energie wird in das örtliche Stromnetz eingespeist. The energy recovered in the cold turbine is fed into the local power grid.

Die Kälteturbine im Leitungstrang des Kältekreislaufs kann als Turbinen/Booster-Einheit ausgebildet sein, wobei der Booster im Leitungsstrang des Kältekreislaufs als Nachverdichter von Luft aus der Verdichterstation geschaltet ist Die in der Kälteturbine gewonnene Energie wird, beispielsweise über eine gemeinsame Welle mit einem Booster zum Antrieb dieses Boosters verwendet. The cold turbine in the cable portion of the refrigeration cycle can be designed as a turbine / booster unit, the booster in the cable portion of the refrigerant circuit is connected as a secondary compressor air from the compressor station, the energy recovered in the cold turbine is, for example, via a common shaft with a booster for driving of the boosters used.

Im Leitungsstrang für die Drosselluft kann ein Nachverdichter für Luft aus der Verdichterstation angeordnet sein. In the wiring harness for the throttle air, a secondary compressor for air from the compressor station may be located.

Eine vorteilhafte Anwendung erfährt das Verfahren und die Vorrichtung gemäß Erfindung in einer Luftzerlegungsanlage zur Belieferung eines Stahlwerks mit Stickstoff und Sauerstoff. An advantageous application finds the method and apparatus according to the invention in an air separation plant for supplying a steelworks with nitrogen and oxygen.

Energetisch günstig kann mit hoher Versorgungssicherheit dem wechselnden Bedarf des Stahlwerks an gasförmigem Druckprodukt Rechnung getragen werden. Energetically favorable can be worn with high security of supply to the changing needs of the steel plant of gaseous pressure product bill. Die Erfindung sowie weitere Ausgestaltungen der Erfindung werden im folgenden anhand von in den Zeichnungen dargestellten Ausführungsbeispielen näher erläutert. The invention and further developments of the invention are explained below based on illustrated in the drawings exemplary embodiments.

Hierbei zeigen: show:

  • Figur 1 ein Ausführungsbeispiel der Erfindung mit Dreisäulen-Rektifikation und Turbinen/Generator-Einheit, 1 shows an embodiment of the invention with three-column rectification and turbine / generator unit,
  • Figur 2 eine Ausführung mit Dreisäulen-Rektifikation, Turbinen/Booster-Einheit und Drosselluft-Nachverdichtung, 2 shows an embodiment with three-column rectification, turbine / booster unit, and throttle air recompression,
  • Figur 3 ein Ausführungsbeispiel der Erfindung mit Zweisäulen-Rektifikation und Turbinen/Generator-Einheit und 3 shows an embodiment of the invention with two-column rectification and turbine / generator unit, and
  • Figur 4 eine Ausführung mit Zweisäulen-Rektifikation, Turbinen/Booster-Einheit und Drosselluft-Nachverdichtung. Figure 4 shows an embodiment with two-column rectification, turbine / booster unit, and throttle air-densification.
Figur 1 Figure 1

In Figur 1 wird zu zerlegende Luft bei 1 angesaugt und in einem Luftverdichter 30 auf einen ersten Druck im wesentlichen Mitteldrucksäulendruck (plus Leitungsverluste) verdichtet, in einer Kühleinrichtung 31 in direktem Kontakt mit Wasser vorgekühlt und in einer Reinigungseinrichtung (Molsiebanlage) 32 insbesondere von Wasser und Kohlendioxid befreit. In Figure 1 is sucked air to be separated at 1 and in an air compressor 30 to a first pressure substantially medium-pressure column pressure (plus cable losses) is compressed, pre-cooled in a cooling device 31 in direct contact with water and in a cleaning device (molecular sieve unit) 32, in particular of water and carbon dioxide liberated.

Die gereinigte Luft wird in drei Teilströme aufgeteilt, von denen der erste ohne weitere druckerhöhende Maßnahmen über Leitung 103, durch einen Hauptwärmetauscher 2 und über Leitung 104 in eine Mitteldrucksäule 6 eingeführt wird. The purified air is divided into three partial flows, of which the first is introduced without further pressure increasing measures via line 103 through a main heat exchanger 2 via conduit 104 to a medium-pressure column. 6 Die Mitteldrucksäule 6 wird - entsprechend der jeweiligen Produktspezifikation und den Druckveriusten - unter einem Druck von 2 bis 4 bar, vorzugsweise etwa 2,5 bis 3,5 bar betrieben. The medium-pressure column 6 is - operated bar under a pressure of 2 to 4 bar, preferably about 2.5 to 3.5 - corresponding to the respective product specifications and Druckveriusten.

Der zweite Teilstrom der gereinigten Luft wird in einem Nachverdichter 202 auf im wesentlichen Drucksäulendruck (plus Leitungsverluste) verdichtet, im Hauptwärmetauscher 2 in indirektem Wärmeaustausch mit kalten Verfahrensströmen auf Taupunktstemperatur abgekühlt und in den Sumpf einer Drucksäule 7 eingeführt (siehe Positionen 201,202,203,2,204 und 7). The second partial stream of the purified air is compressed in a secondary compressor 202 in substantially pressure column pressure (plus cable losses), cooled in main heat exchanger 2 in indirect heat exchange with cold process streams to dew point and introduced into the bottom of a pressure column 7 (see positions 201,202,203,2,204 and 7) , Die Drucksäule 7 wird bei einem Arbeitsdruck von 5 bis 10 bar, vorzugsweise 5,5 bis 6,5 bar betrieben und ist über einen Hauptkondensator 3 mit einer Niederdrucksäule 5 thermisch gekoppelt. The 7-pressure column is operated at a working pressure of 5 to 10 bar, preferably 5.5 to 6.5 bar and is thermally coupled via a main condenser 3 with a low-pressure column. 5 Letztere arbeitet bei einem Druck von 1,1 bis 2,0 bar vorzugsweise 1,3 bis 1,7 bar. The latter operates bar, preferably 1.3 to 1.7 bar at a pressure of 1.1 to 2.0. Der Luftnachverdichter 202 kann von derselben Motorwelle angetrieben werden wie der Luftverdichter 30. The Luftnachverdichter 202 can be driven by the same motor shaft as the air compressor 30th

Der dritte Teilstrom wird über eine Leitung 301 einer Verdichterstation 305 für Turbinenluft (306, 307, 308) in eine Turbine 309 und/oder für Rektifikationsluft (313, 314, 315) zugeführt, wobei der Ansaugdruck 303 mit Hilfe einer Drosselvorrichtung 302 vermindert werden kann insbesondere bei Unterlastbetrieb. The third part stream is fed via a line 301 to a compressor station 305 for turbine air (306, 307, 308) in a turbine 309 and / or for Rektifikationsluft (313, 314, 315) supplied, wherein the suction pressure can be reduced 303 by means of a throttle device 302 in particular when an load operation.

Die Luft des dritten Teilstroms wird in der Verdichterstation 305 von etwa Mitteldrucksäulendruck auf einen Druck komprimiert, der einer Luft-Kondensationstemperatur entspricht, die mindestens etwa gleich der Verdampfungstemperatur des flüssigen Drucksauerstoffs 17 ist Alternativ kann der dritte Teilstrom der gereinigten Luft auch an der Druckseite des Luftnachverdichters 202 abgezweigt werden, wenn gleichzeitig Luft (312) aus der Entspannungsturbine 309 in die Drucksäule 7 eingespeist wird. The air of the third sub-stream is compressed in the compressor station 305 of about medium-pressure column pressure at a pressure corresponding to an air-condensation temperature which is at least approximately equal to the evaporation temperature of the liquid pressure oxygen 17 Alternatively, the third partial stream of the purified air can also come to the pressure side of the Luftnachverdichters are branched off 202 when air simultaneously (312) is fed from the expansion turbine 309 in the pressure column. 7 Der Ansaugdruck der Verdichterstation 305 entspricht dann dem Drucksäulendruck. The suction pressure of the compressor station 305 then corresponds to the pressure column pressure.

Ein erster Teil 307 der hochverdichteten Luft 306 wird bei einer Temperatur 308, die zwischen den Temperaturen am warmen und am kalten Ende des Hauptwärmetauschers 2 liegt, der Entspannungsturbine 309 zugeleitet und dort auf etwa Mitteldrucksäulendruck arbeitsleistend entspannt. A first portion 307 of the highly compressed air 306 is supplied and at a temperature of 308, which lies between the temperatures at the hot and at the cold end of main heat exchanger 2, the expansion turbine 309 where work expanded to approximately intermediate pressure column pressure. Im vorliegenden Ausführungsbeispiel wird die Turbinenleistung durch einen Bremsgenerator an das Werksnetz übertragen.Der entspannte Turbinenaustrittsstrom wird teils durch den Hauptwärmetauscher 2 über die Leitungen 310,311 und 304 auf die Saugseite der Verdichterstation 305 zurückgeführt, teils über Leitung 312 in den Sumpf der Mitteldrucksäule 6 eingespeist. In the present embodiment, the turbine output is controlled by a brake generator to the work network übertragen.Der expanded turbine exhaust stream is fed to the bottom of the medium-pressure column 6 and partly through the main heat exchanger 2 is returned via lines 310.311 and 304 on the suction side of the compressor station 305 and partly via line 312th

Ein zweiter Teil 313 der hochverdichteten Luft 306 wird gegen den verdampfenden Drucksauerstoff 17 mindestens teilweise, vorzugsweise vollständig oder im wesentlichen vollständig verflüssigt, zu einem Teil 314 oberhalb vom Sumpf in die Niederdrucksäule 5 und zu einem anderen Teil 315 in den Sumpf der Drucksäule 7 entspannt. A second portion 313 of the highly compressed air 306 is at least partially, preferably completely or substantially completely liquefied against vaporizing pressurized oxygen 17, relax to a part 314 above the sump in the low pressure column 5 and to another part 315 in the bottom of the pressure column. 7

Sumpfflüssigkeit 70 und Waschstickstoff 74 vom Kopf der Drucksäule 7 werden in einem Unterkühlungsgegenströmer 4 gegen einen Restgasstrom 50 der Niederdrucksäule 5 unterkühlt und jeweils in die Niederdrucksäule 5 und / oder in die Mitteldrucksäule entspannt (Leitungen 71,72,73,75,76 und 77). Bottoms liquid 70 and washing nitrogen 74 from the top of the pressure column 7 are cooled in a Unterkühlungsgegenströmer 4 against a residual gas stream 50 of the low-pressure column 5 and respectively into the low-pressure column 5 and / or in the intermediate pressure column relaxed (lines 71,72,73,75,76 and 77) , Sumpfflüssigkeit 60 und Waschstickstoff 61 aus der Mitteldrucksäule werden ebenfalls im Unterkühlungsgegenströmer 4 gegen den Restgasstrom 50 unterkühlt (in Figur 1 nicht dargestellt) oder die Sumpfflüssigkeit 60 direkt in den Kopfkondensator 10 der Mitteldrucksäule und der Waschstickstoff 61 auf den Kopf der Niederdrucksäule 5 aufgegeben. Bottoms liquid 60 and washing nitrogen 61 from the medium pressure column (not shown in Figure 1) also in Unterkühlungsgegenströmer 4 against the residual gas stream 50 sub-cooled, or the bottom liquid 60 fed directly into the top condenser 10 of the medium-pressure column and the washing nitrogen 61 to the top of the low pressure column. 5 Ein Restgasstrom 51 und Produkte aus dem Rektifikationsabschnitt, im Beispiel GOX und DGOX werden im Hauptwärmetauscher 2 etwa auf Umgebungstemperatur angewärmt (Leitungen 51, 52, 54, 55,17 und 18). A residual gas stream 51 and product from the rectification section, in the example GOX and DGOX be in the main heat exchanger 2 to approximately ambient temperature warmed (lines 51, 52, 54, 55,17 and 18). Der Restgasstrom 52 kann vollständig oder teilweise als Strom 53 zur Regenerierung der Molekularsiebstation 32 eingesetzt werden. The residual gas stream 52 may be completely or partially used as stream 53 to regenerate the molecular sieve station 32nd

Flüssiger Sauerstoff 15 wird dem Sumpf der Niederdrucksäule entnommen, je nach Produktspezifikation mit Hilfe einer Sauerstoffpumpe 16 auf den geforderten Abgabedruck komprimiert oder vollständig oder teilweise in einen Wechselpeichertank 80 eingefüllt. Liquid oxygen 15 is removed from the bottom of the low pressure column, compressed depending on the product specification with the aid of an oxygen pump 16 to the required discharge pressure or completely or partially filled in a Wechselpeichertank 80th Flüssiger Stickstoff 78 wird vom Kopf der Niederdrucksäule 5 abgezogen oder von einer der Waschstickstoffleitungen 75 bzw.61 abgezweigt und ebenfalls innenverdichtet (in Figur 1 nicht dargestellt) oder in einen Wechselspeichertank 79 eingespeist. Liquid nitrogen 78 is withdrawn from the top of the low pressure column 5 or branched from one of the wash lines 75 bzw.61 nitrogen and also internally compressed (not shown in Figure 1) or fed to a removable storage tank 79th

Zur Erhöhung der Flexibilität der Fahrweise und der Verfügbarkeit der Druckprodukte, im Beispiel des DGOX besteht die Verdichterstation 305 aus mindestens zwei parallel geschalteten Verdichtem. To increase the flexibility of the procedure and the availability of the printed products, in the example of DGOX 305 there is a compressor station consisting of at least two parallel-connected Verdichtem. Hierdurch wird es möglich, die Wechselspeicheranlage auch als reinen Gaseapparat zu betreiben,dh ohne Flüssigproduktion weiterhin den innenverdichteten Drucksauerstoff (DGOX) zu erzeugen. This makes it possible to operate the removable storage system as a pure gas apparatus to produce ie without liquid production continues to internally compressed oxygen pressure (DGOX). Im Fall von zwei Verdichtem wird einer der beiden Verdichter der Verdichterstation 305 außer Betrieb genommen und der zweite Verdichter übernimmt die Aufgabe, den innenverdichteten Drucksauerstoff 17 zu verdampfen. In the case of two Verdichtem one of the two compressors of the compressor station is removed from service 305 and the second compressor takes over the task to evaporate the internally compressed oxygen pressure 17th Somit besteht die Verdichterstation 305 erfindungsgemäß aus zwei Verdichtern mit jeweils unterschiedlicher Funktion, von denen der eine zur Erzeugung der Kälte für die Flüssigproduktion und der andere zur Verdampfung des innenverdichteten Drucksauerstoffs herangezogen wird. Thus, the compressor station 305 according to the invention consists of two compressors, each with different functions, one of which is for generating the refrigeration for liquid production and the other is used for evaporation of the internally compressed oxygen pressure.

Die Wechselspeichertanks 79 und 80 dienen im Beispiel einer zeitlich begrenzten Überproduktion von DGOX, der Entnahme von LOX und LIN als Verkaufsprodukte, als Notversorgungstanks,als Wechselspeicherung der LOX - und LIN -Kälteinhalte und als Kälteversorgung bei abgeschaltetem Kältekreislauf. The removable storage tanks 79 and 80 serve as a temporary over-production of DGOX, extraction of LOX and LIN as commercial products, as Notversorgungstanks, as removable storage of the LOX - and LIN -Kälteinhalte and as cold supply, switch off the cooling circuit. Die in Figur 1 angegebene Verdichterstation kann ein- oder mehr- stufige Maschinen mit Zwischen- und / oder Nachkühlung enthalten. The specified in Figure 1 compressor station can be switched on or include multi-stage machines with intermediate and / or after-cooling.

Figur 2 Figure 2

In Abweichung zum Ausführungsbeispiel in Figur 1 wird die Arbeitsleistung der Entspannungsturbine 309 in der vorliegenden Ausführung an einen Booster übertragen. In deviation from the exemplary embodiment in Figure 1, the work output of the turboexpander 309 is transmitted in the present embodiment, a booster. Außerdem wird der Luftdrosselstrom 313 vor seiner Abkühlung im Hauptwärmetauscher 2 und anschließender isenthalper Entspannung in die Doppelsäule 5,7 auf einen Druck komprimiert, der mindestens so groß ist wie der Enddruck der Verdichterstation 305 des Ausführungsbeispiels in Figur 1. In addition, the air flow restrictor 313 is compressed into the double column to a pressure 5.7 before being cooled in the main heat exchanger 2 and subsequent isenthalpic expansion which is at least as large as the discharge pressure of the compressor station 305 of the embodiment in FIG. 1

Figur 3 Figure 3

In Figur 3 wird zu zerlegende Luft bei 1 angesaugt und in einem Luftverdichter 30 auf einen ersten Druck im wesentlichen Mitteldrucksäulendruck (plus Leitungsverluste) verdichtet, in einer Kühleinrichtung 31 in direktem Kontakt mit Wasser vorgekühlt und in einer Reinigungseinrichtung (Molsiebanlage) 32 insbesondere von Wasser und Kohlendioxid befreit. In Figure 3 is sucked air to be separated at 1 and in an air compressor 30 to a first pressure substantially medium-pressure column pressure (plus cable losses) is compressed, pre-cooled in a cooling device 31 in direct contact with water and in a cleaning device (molecular sieve unit) 32, in particular of water and carbon dioxide liberated.

Die gereinigte Luft wird in drei Teilströme aufgeteilt, von denen der erste ohne weitere druckerhöhende Maßnahmen über Leitung 103, durch Hauptwärmetauscher 2 und über Leitung 104 in eine Mitteldrucksäule 6 eingeführt werden kann. The purified air is divided into three partial streams, the first of which can be introduced into a medium pressure column 6 without further pressure increasing measures via line 103 through main heat exchanger 2 via line 104th Die Mitteldrucksäule 6 wird - entsprechend der jeweiligen Produktspezifikation und den Druckverfusten - unter einem Druck von 2 bis 4 bar, vorzugsweise etwa 2,5 bis 3,5 bar betrieben. The medium-pressure column 6 is - operated under a pressure of 2 to 4 bar, preferably about 2.5 to 3.5 - corresponding to the respective product specifications and Druckverfusten.

Der zweite Teilstrom der gereinigten Luft wird in einem Nachverdichter 202 auf einen Druck verdichtet, der einer Luft-Kondensationstemperatur entspricht, die mindestens etwa gleich der Verdampfungstemperatur eines flüssigen Niederdrucksauerstoffs 15 ist, im Hauptwärmetauscher 2 in indirektem Wärmeaustausch mit kalten Verfahrensströmen abgekühlt und in einen Sumpfkondensator 3 der Niederdrucksäule 5 eingeführt (siehe Positionen 201, 202, 203, 2, 204 und 3). The second partial stream of the purified air is compressed to a pressure in a secondary compressor 202 which corresponds to an air-condensation temperature which is at least approximately equal to the vaporization temperature of a liquid low-pressure oxygen 15, cooled in the main heat exchanger 2 in indirect heat exchange with cold process streams and a bottom condenser 3 introduced the low pressure column 5 (see positions 201, 202, 203, 2, 204 and 3).

Letztere arbeitet bei einem Druck von 1,1 bis 2,0 bar vorzugsweise 1,3 bis 1,7 bar. The latter operates bar, preferably 1.3 to 1.7 bar at a pressure of 1.1 to 2.0. Der Luftnachverdichter 202 kann von derselben Motorwelle angetrieben werden wie der Luftverdichter 30. The Luftnachverdichter 202 can be driven by the same motor shaft as the air compressor 30th

Bei hohen Sauerstoffreinheiten (größer 99,5 % ) geht der gezeigte Zweisäulenapparat im Grenzfall über in den normalen Doppelsäulenapparat (siehe zB Patentschrift DE 195 26 785 C1). At high oxygen purities (greater than 99.5%) is the two-column apparatus shown in the limiting case, in the normal double column apparatus (see for example patent document DE 195 26 785 C1). Der zweite Teilstrom geht dann gegen Null und die Niederdrucksäulenanstiche der Ströme 62 und 63 verschieben sich in Richtung Sumpf der Niederdrucksäule 5, so daß der Kopfkondensator 10 zum Hauptkondensator der Doppelsäule wird und sich der Druck der Mitteldrucksäule entsprechend der thermischen Kopplung erhöht The second partial flow then goes to zero and move the low pressure column first passes of the currents 62 and 63 toward the bottom of the low pressure column 5, so that the head capacitor 10 becomes the main condenser of a double column and the pressure of the medium pressure column increased according to the thermal coupling

Der dritte Teilstrom wird über eine Leitung 301 einer Verdichterstation 305 für Turbinenluft (306, 307, 308) in eine Turbine 309 und/oder für Rektifikationsluft (313, 314, 315) zugeführt, wobei deren Ansaugdruck 303 mit Hilfe einer Drosselvorrichtung 302 vermindert werden kann insbesondere bei Unterlastbetrieb. The third part stream is fed via a line 301 to a compressor station 305 for turbine air (306, 307, 308) in a turbine 309 and / or for Rektifikationsluft (313, 314, 315) supplied, wherein the suction pressure can be reduced 303 by means of a throttle device 302 in particular when an load operation. Die Luft des dritten Teilstromes wird in der Verdichterstation 305 von etwa Mitteldrucksäulendruck auf einen Druck komprimiert, der einer Luft-Kondensationstemperatur entspricht, die mindestens etwa gleich der Verdampfungstemperatur des flüssigen Drucksauerstoffs 17 ist. The air of the third sub-stream is compressed in the compressor station 305 of about medium-pressure column pressure at a pressure corresponding to an air-condensation temperature which is at least approximately equal to the evaporation temperature of the liquid oxygen pressure 17th

Ein erster Teilstrom 307 der hochverdichteten Luft 306 wird über Leitung 308 bei einer Temperatur, die zwischen den Temperaturen am warmen und am kalten Ende des Hauptwärmetauschers 2 liegt, der Entspannungsturbine 309 zugeleitet und dort auf etwa Mitteldrucksäulendruck arbeitsleistend entspannt. A first partial stream 307 of the highly compressed air 306 is supplied via line 308 at a temperature, which lies between the temperatures at the hot and at the cold end of main heat exchanger 2, the expansion turbine 309 where work expanded to approximately intermediate pressure column pressure. Im vorliegenden Ausführungsbeispiel wird die Turbinenleistung durch einen Bremsgenerator an das Werksnetz übertragen.Der entspannte Turbinenaustrittsstrom wird teils durch den Hauptwärmetauscher 2 über die Leitungen 310,311 und 304 auf die Saugseite der Verdichterstation 305 zurückgeführt, teils über Leitung 312 in den Sumpf der Mitteldrucksäule 6 eingespeist In the present embodiment, the turbine output is controlled by a brake generator to the work network übertragen.Der expanded turbine exhaust stream is fed to the bottom of the medium-pressure column 6 and partly through the main heat exchanger 2 is returned via lines 310.311 and 304 on the suction side of the compressor station 305 and partly via line 312

Ein zweiter Teilstrom 313 der hochverdichteten Luft 306 wird gegen den verdampfenden Drucksauerstoff 17 mindestens teilweise, vorzugsweise vollständig oder im wesentlichen vollständig verflüssigt, zu einem Teil 314 oberhalb vom Sumpf in die Niederdrucksäule 5 und zu einem anderen Teil 315 in den Sumpf der Mitteldrucksäule 6 entspannt. A second partial stream 313 of the highly compressed air 306 is at least partially, preferably completely or substantially completely liquefied against vaporizing pressurized oxygen 17, relax to a part 314 above the sump in the low pressure column 5 and to another part 315 in the bottom of the medium pressure column. 6

Sumpfflüssigkeit 60 und Waschstickstoff 61 vom Kopfkondensator 10 der Mitteldrucksäule 6 werden in einem Unterkühlungsgegenströmer 4 gegen einen Restgasstrom 50 der Niederdrucksäule 5 unterkühlt und jeweils in diese entspannt (Leitungen 71,75 und 76). Bottoms liquid 60 and washing nitrogen 61 from the top condenser 10 of the medium-pressure column 6 be subcooled in a Unterkühlungsgegenströmer 4 against a residual gas stream 50 of the low-pressure column 5, and in each case the relaxed (lines 71,75 and 76). Ein Restgasstrom 51 und Produkte aus dem Rektifikationsabschnitt, im Beispiel DGOX werden im Hauptwärmetauscher 2 etwa auf Umgebungstemperatur angewärmt (Leitungen 51,52,17 und 18). A residual gas stream 51 and product from the rectification section, in the example DGOX be in the main heat exchanger 2 to approximately ambient temperature warmed (lines 51,52,17 and 18). Der Restgasstrom 52 kann vollständig oder teilweise zur Regenerierung 53 der Molekularsiebstation 32 eingesetzt werden. The residual gas stream 52 can be used fully or partially to regenerate the molecular sieve station 53 32nd

Flüssiger Sauerstoff 15 wird dem Sumpf der Niederdrucksäule entnommen, je nach Produktspezifikation mit Hilfe einer Sauerstoffpumpe 16 auf den geforderten Abgabedruck komprimiert oder vollständig oder teilweise in einen Wechselpeichertank 80 eingefüllt. Liquid oxygen 15 is removed from the bottom of the low pressure column, compressed depending on the product specification with the aid of an oxygen pump 16 to the required discharge pressure or completely or partially filled in a Wechselpeichertank 80th Flüssiger Stickstoff 78 wird vom Kopf der Niederdrucksäule 5 abgezogen oder von der Waschstickstoffleitung 61 abgezweigt und ebenfalls innenverdichtet (in Figur 1 nicht dargestellt) oder in den Wechselspeichertank 79 eingespeist. Liquid nitrogen 78 is withdrawn from the top of the low pressure column 5 or branched off from the nitrogen washing line 61 and also internally compressed (not shown in Figure 1) or fed into the removable storage tank 79th

Zur Erhöhung der Flexibilität der Fahrweise und der Verfügbarkeit der Druckprodukte, im Beispiel des DGOX besteht die Verdichterstation 305 aus mindestens zwei parallel geschalteten Verdichtem. To increase the flexibility of the procedure and the availability of the printed products, in the example of DGOX 305 there is a compressor station consisting of at least two parallel-connected Verdichtem. Hierdurch wird es möglich, die Wechselspeicheranlage auch als reinen Gaseapparat zu betreiben,dh ohne Flüssigproduktion weiterhin den innenverdichteten Drucksauerstoff (DGOX) zu erzeugen. This makes it possible to operate the removable storage system as a pure gas apparatus to produce ie without liquid production continues to internally compressed oxygen pressure (DGOX). Im Fall von zwei Verdichtem wird einer der beiden Verdichter der Verdichterstation 305 außer Betrieb genommen und der zweite Verdichter übernimmt die Aufgabe, den innenverdichteten Drucksauerstoff 17 zu verdampfen. In the case of two Verdichtem one of the two compressors of the compressor station is removed from service 305 and the second compressor takes over the task to evaporate the internally compressed oxygen pressure 17th Somit besteht die Verdichterstation 305 erfindungsgemäß aus zwei Verdichtern mit jeweils unterschiedlicher Funktion, von denen der eine zur Erzeugung der Kälte für die Flüssigproduktion und der andere zur Verdampfung des innenverdichteten Drucksauerstoffs herangezogen wird. Thus, the compressor station 305 according to the invention consists of two compressors, each with different functions, one of which is for generating the refrigeration for liquid production and the other is used for evaporation of the internally compressed oxygen pressure.

Die Wechselspeichertanks 79 und 80 dienen im Beispiel einer zeitlich begrenzten Überproduktion von DGOX, der Entnahme von LOX und LIN als Verkaufsprodukte, als Notversorgungstanks,als Wechselspeicherung der LOX - und LIN -Kälteinhalte und als Kälteversorgung bei abgeschaltetem Kältekreislauf. The removable storage tanks 79 and 80 serve as a temporary over-production of DGOX, extraction of LOX and LIN as commercial products, as Notversorgungstanks, as removable storage of the LOX - and LIN -Kälteinhalte and as cold supply, switch off the cooling circuit. Die in Figur 3 angegebene Verdichterstation kann ein- oder mehr- stufige Maschinen mit Zwischen- und / oder Nachkühlung enthalten. The specified in Figure 3 compressor station can be switched on or include multi-stage machines with intermediate and / or after-cooling.

Figur 4 Figure 4

In Abweichung zum Ausführungsbeispiel 3 wird die Arbeitsleistung der Entspannungsturbine 309 in der vorliegenden Ausführung an einen Booster übertragen. In deviation to the Embodiment 3, the performance of the expansion turbine is transferred 309 in the present embodiment, a booster. Außerdem wird der Luftdrosselstrom 313 vor seiner Abkühlung im Hauptwärmetauscher 2 und anschließender isenthalper Entspannung in die Säulen 5 und 6 auf einen Druck komprimiert, der mindestens so groß ist wie der Enddruck der Verdichterstation 305 des Ausführungsbeispiel in Figur 3. In addition, the air flow restrictor 313 is compressed to a pressure before it is cooled in the main heat exchanger 2 and subsequent isenthalpic expansion in the columns 5 and 6, which is at least as large as the discharge pressure of the compressor station 305 of the exemplary embodiment in FIG. 3

Beispiel: Example:

Für die Belieferung eines Stahlwerks werden stark schwankende Mengen DGOX und Druckstickstoff (DRGAN) benötigt. highly fluctuating amounts DGOX and compressed nitrogen (DRGAN) for the supply of a steelworks needed. Für die Belieferung des Gasmarktes sollen zusätzlich die Flüssigprodukte LOX, LIN und Flüssigargon (LAR) produziert werden, um die Wirtschaftlichkeit der Produktionsanlage zu erhöhen. For the supply of the gas market in addition the liquid products LOX, LIN, and liquid argon (LAR) to be produced in order to increase the efficiency of the production plant. Die Investitionsentscheidung wird zugunsten einer Anlage mit Turbinen/Booster-Einheit und Doppelsäulenrektifikation gefällt, weil keine Energie ins örtliche Stromnetz eingespeist werden darf und weil eine hohe Sauerstoffreinheit gefordert wird. The investment decision is precipitated in favor of a system with a turbine / booster unit and Doppelsäulenrektifikation because no energy can be fed into the local power grid and because a high oxygen purity is required. Bis auf die nicht dargestellte Argongewinnung entspricht dies einer Anlage, wie sie in Figur 4 dargestellt ist. Except for the unillustrated argon recovery, this corresponds to a plant, as shown in FIG. 4 Die Tabelle zeigt für vier Hauptbetriebsarten A1, A2, A3 und A4 der Anlage die Produktströme, die Wechselspeicherströme, für die (Kreislauf- und Drosselluft-) Verdichterstation die Anzahl der im Betrieb befindlichen Kompressoren, die Luftströme und den Energiebedarf der Anlage. The table shows four main modes A1, A2, A3 and A4 of the plant, the product streams, the removable storage streams for which (circulatory and Drosselluft-) compressor station, the number of compressors is in operation, the air streams and the energy requirements of the plant. Alle Gas- und Flüssigkeitsströme sind in m 3 /h angegeben, wobei jeweils m 3 /h im Normalzustand bei 1atm und 273 K gemeint sind. All gas and liquid streams are given in m 3 / h, wherein each m 3 / h are meant in the normal state at 1 atm and 273 K. Die Betriebsfälle A1, A2 und A3 zeichnen sich dadurch aus, daß beide Kompressoren der Verdichterstation in Betrieb sind und einen Turbinenstrom und einen Drosselstrom liefem. The operating cases A1, A2 and A3 are characterized in that both compressors of the compressor station are in operation, and a turbine flow and a choke current liefem.

Im Betriebsfall A1 werden zusätzlich zur Flüssigproduktion 10.000 m 3 /h DGOX erzeugt. During operation, A1 10,000 m 3 / h DGOX be produced in addition to liquid production. Für eine Belieferung des Stahlwerks mit 13.000 m 3 /h DGOX wie in Betriebsfall A2 werden zusätzlich 3000 m 3 /h als LOX einem LOX-Tank flüssig entnommen und innenverdichtet als DGOX abgegeben. For a supply of the steelworks with 13,000 m 3 / h in case of operation as DGOX A2 additional 3000 m 3 / h are given as LOX liquid taken from a LOX tank and internally compressed as DGOX. Der Kälteinhalt des LOX wird genutzt und reicht aus, um den LIN Tank mit 2.800 m 3 /h zu füllen. The cold content of the LOX is used and is sufficient to fill the LIN tank with 2,800 m 3 / h. Im Betriebsfall A3 werden nur 7.000 m 3 /h DGOX an das Stahlwerk abgegeben. In the operating case A3, only 7,000 m 3 / h DGOX be delivered to the steelworks. Der beispielsweise im Betriebsfall A2 entleerte LOX-Tank wird mit 3000 m 3 /h LOX wieder befüllt Die hierzu benötigte Kälte wird mit LIN aus dem vom Betriebsfall A2 her gefüllten LIN-Tank zugeführt. The emptied, for example, in the operating case A2 LOX tank is refilled with 3000 m 3 / h LOX The refrigeration required for this purpose is supplied with LIN from the forth filled by the operating case A2 LIN tank.

Im Betriebsfall A4 ist in der Verdichterstation nur ein Kompressor in Betrieb. During operation, A4 in the compressor station is just one compressor is in operation. Er liefert den Drosselstrom, Flüssigkeit wird nicht erzeugt. It provides the inductor current, liquid is not generated. Selbst für die im Stahlwerk maximal benötigte DGOX Menge von 13.000 m 3 /h ist die hierfür benötige Kälteleistung um eine Größenanordnung kleiner als in den Betriebsfällen A1, A2 und A3, der äquivalent benötigte Turbinenstrom müßte nur 4000 m 3 /h betragen. Even for the maximum required in the steel mill DGOX amount of 13,000 m 3 / h, the purpose need cooling power is about a size arrangement is smaller than in the operating cases A1, A2 and A3, the equivalent required turbine power would have to be as low as 4000 m 3 / h. Der Kältekreislauf der Anlage wird deshalb günstig durch Flüssigkeit aus den Tanks gedeckt und der Turbinenstrom abgeschaltet. The refrigerant circuit of the plant is therefore low covered by liquid from the tanks and the turbine power off. Andere Betriebsfälle sind denkbar. Other operating cases are possible. Die genannten Betriebsfälle zeichnen sich dadurch besonders aus, daß alle betrieblichen Anforderungen energetisch günstig erfüllt werden, weil die Maschinen in ihrem Auslegungspunkt bei etwa 100 % Leistung betrieben werden. The operating situations described are characterized particularly in that all business requirements are met energetically favorable because the machines are operated within their design point at about 100%. Der Stromverbrauch der Anlage ist in der überwiegenden Zeit nahezu konstant. The power consumption of the system is nearly constant in the majority of the time. Deshalb kann bei den Elektroversorgungsuntemehmen ein günstiger Stromtarif erzielt werden. Therefore, in the Elektroversorgungsuntemehmen a favorable electricity rate can be achieved.

Betriebsfall operating case A1 A1 A2 A2 A3 A3 A4 A4
Eintrittsluft inlet air m 3 /h m 3 / h 65.000 65,000 65.000 65,000 65.000 65,000 65.000 65,000
Produkte Products
DGOX DGOX m 3 /h m 3 / h 10.000 10,000 13.000 13,000 7.000 7000 13.000 13,000
LOX LOX m 3 /h m 3 / h 3.000 3000 3.000 3000 3.000 3000 - -
LIN LIN m 3 /h m 3 / h 4.000 4000 3.000 3000 4.300 4300 - -
DRGAN DRGAN m 3 /h m 3 / h 2.000 2000 2.000 2000 2.000 2000 2.000 2000
LAR LAR m 3 /h m 3 / h 430 430 430 430 430 430 430 430
Wechselpeicherströme Wechselpeicherströme
LOX zum Tank LOX to the tank m 3 /h m 3 / h - - - - 3.000 3000 - -
LIN zum Tank LIN to the tank m 3 /h m 3 / h - - 2.800 2800 - - - -
LOX vom Tank LOX from the tank m 3 /h m 3 / h - - 3.000 3000 - - - -
LIN vom Tank LIN from the tank m 3 /h m 3 / h - - - - 2.800 2800 - -
Verdichterstation compressor station
Anzahl der betriebenen Kompressoren Number of operating compressors m 3 /h m 3 / h 2 2 2 2 2 2 1 1
Turbinenstrom turbine power m 3 /h m 3 / h 51.000 51,000 43.500 43,500 57.000 57,000 4.000 4000
Drosselstrom inductor current m 3 /h m 3 / h 21.000 21,000 23.000 23,000 17.000 17,000 23.000 23,000
Stromverbrauch power consumption kW kW 11.000 11,000 11.000 11,000 11.000 11,000 7.700 7700

Claims (12)

  1. Process for producing gaseous pressurized product by low-temperature fractionation of air which is operated at times in a gas mode and at times in a combined mode,
    in which process, in the gas mode and in the combined mode
    cleaned charge air is cooled under excess pressure, is partially liquefied and is subjected to rectification in order to obtain gaseous and liquid fractions,
    cryogenic liquid from at least one of the liquid fractions from the rectification is evaporated under elevated pressure by indirect heat exchange with charge air, is heated and is obtained as gaseous pressurized product,
    in which process, in combined mode, gaseous pressurized product and liquid product are obtained, and
    the refrigeration required to achieve this is generated in an air refrigeration circuit as a result of air being compressed in the refrigeration circuit and expanded in a work-performing manner, in the process heat is extracted from the air, and the air which has undergone work-performing expansion is at least in part heated again in countercurrent with the charge air which is to be cooled and is then recompressed,
    cryogenic liquid is produced by rectification and is at least partially stored,
    and in which process in gas mode the air throughput in the refrigeration circuit is reduced to zero, and cryogenic stored liquid is used to compensate for refrigeration losses which are no longer covered by the refrigeration circuit.
  2. Process according to Claim 1, characterized in that cryogenic liquid from at least one liquid fraction from the rectification, for example liquid nitrogen (LIN), liquid oxygen (LOX) or liquid air, is temporarily stored in a tank in order to compensate for refrigeration losses in gas mode, buffer vessels and/or product tanks being used as the tank for storing these fractions.
  3. Process according to Claim 1, characterized in that from time to time, using at least two tanks, alternating storage is carried out, in which, on the one hand, when there is a high demand for pressurized oxygen (DGOX), in addition to the LOX from the rectification, temporarily stored LOX is removed from one tank, compressed, evaporated in countercurrent and heated, and is then released as DGOX product, and in the process, in countercurrent. refrigeration is recovered and used to produce and temporarily store LIN product, and in which, on the other hand, when there is a low DGOX demand, correspondingly small amounts of LOX are released from the rectification system as DGOX, and correspondingly more LOX is temporarily stored.
  4. Process according to one of Claims 1 to 3, characterized in that a two-column process is used, in which top cooling of the pressure column is effected using an intermediate liquid from a low-pressure column, and bottom heating of the low-pressure column is carried out by indirect heat exchange with air.
  5. Process according to one of Claims 1 to 3, characterized in that a three-column process is used as the rectification system, using a double column with a high-pressure part and a low-pressure part and an additional column under intermediate pressure.
  6. Process according to one of Claims 1 to 5, characterized in that air from the refrigeration circuit downstream of the compression or air which has been recompressed downstream of the compression is used as charge air which is brought into indirect heat exchange with the evaporating cryogenic liquid from which the gaseous pressure product is obtained.
  7. Process according to one of Claims 1 to 6, characterized in that the work-performing expansion takes place in at least one refrigeration turbine, the output at the shaft of a turbine of this type being used to drive either a current-generating generator or a booster, the booster being used, for example, for recompression of the air in the refrigeration circuit.
  8. Apparatus for carrying out the process according to one of Claims 1 to 7, having
    a main compressor for charge air, the exit pressure of the main air compressor also being the working pressure of a subsequent cleaning unit,
    a clean-air line leading from the cleaning unit to a compressor station for the air in the refrigeration circuit and for the air for rectification,
    and a pressure-side line from the compressor station which on one side opens out into a system of lines of the refrigeration circuit with at least one refrigeration turbine and on the other side opens out into a branch for passing throttled air to the columns,
    and in which apparatus the compressor station is designed with at least two compressors which are arranged in parallel and are designed in such a way that, in gas mode, only one of the compressors is operating, this compressor supplying throttled air, and the refrigeration circuit is not exposed to air, while in combined mode with production of pressurized product and liquid product, at least two compressors which are arranged in parallel are operating and, in addition, in order to supply throttled air, the refrigeration circuit is also acted on by air, and that the apparatus has means for storing liquid product.
  9. Apparatus according to Claim 8, characterized in that the refrigeration turbine in the system of lines of the refrigeration circuit is designed as a turbine/generator unit.
  10. Apparatus according to Claim 8, characterized in that the refrigeration turbine in the line section of the refrigeration circuit is designed as a turbine/booster unit, the booster in the system of lines of the refrigeration circuit being connected as a recompressor for air from the compressor station.
  11. Apparatus according to Claim 8 or 9, characterized in that a recompressor for air from the compressor station is arranged in the system of lines for the throttled air.
  12. Use of the process according to one of Claims 1 to 7 and of the apparatus according to one of Claims 8 to 11 in an air fractionation installation for supplying a steelworks with nitrogen and oxygen.
EP19990106715 1998-04-08 1999-04-01 Cryogenic air separation plant with two different operation modes Expired - Lifetime EP0949471B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE1998115885 DE19815885A1 (en) 1998-04-08 1998-04-08 Air separation method producing gas, or gas and liquid e.g. for steel plant
DE19815885 1998-04-08
EP98112276 1998-07-02
EP98112276 1998-07-02
EP19990106715 EP0949471B1 (en) 1998-04-08 1999-04-01 Cryogenic air separation plant with two different operation modes

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Application Number Priority Date Filing Date Title
EP19990106715 EP0949471B1 (en) 1998-04-08 1999-04-01 Cryogenic air separation plant with two different operation modes

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EP0949471A1 EP0949471A1 (en) 1999-10-13
EP0949471B1 true EP0949471B1 (en) 2002-12-18

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US (1) US6185960B1 (en)
EP (1) EP0949471B1 (en)
AT (1) AT230098T (en)
CZ (1) CZ297724B6 (en)
DE (1) DE19815885A1 (en)
HU (1) HU9900988A2 (en)
PL (1) PL191500B1 (en)

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DE102007031759A1 (en) 2007-07-07 2009-01-08 Linde Ag Method and apparatus for producing gaseous pressure product by cryogenic separation of air
DE102007031765A1 (en) 2007-07-07 2009-01-08 Linde Ag Process for the cryogenic separation of air
DE102009034979A1 (en) 2009-04-28 2010-11-04 Linde Aktiengesellschaft Method for producing pressurized oxygen by evaporating liquid oxygen using a copper and nickel heat exchanger block
EP2312248A1 (en) 2009-10-07 2011-04-20 Linde Aktiengesellschaft Method and device for obtaining pressurised oxygen and krypton/xenon
EP2458311A1 (en) 2010-11-25 2012-05-30 Linde Aktiengesellschaft Method and device for creating a gaseous, pressurised product by the cryogenic decomposition of air
DE102010052544A1 (en) 2010-11-25 2012-05-31 Linde Ag Process for obtaining a gaseous product by cryogenic separation of air
EP2520886A1 (en) 2011-05-05 2012-11-07 Linde AG Method and device for creating gaseous oxygen pressurised product by the cryogenic decomposition of air
EP2568242A1 (en) 2011-09-08 2013-03-13 Linde Aktiengesellschaft Method and device for generating of steel
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DE102013017590A1 (en) 2013-10-22 2014-01-02 Linde Aktiengesellschaft Method for recovering methane-poor fluids in liquid air separation system to manufacture air product, involves vaporizing oxygen, krypton and xenon containing sump liquid in low pressure column by using multi-storey bath vaporizer
DE102012017488A1 (en) 2012-09-04 2014-03-06 Linde Aktiengesellschaft Method for building air separation plant, involves selecting air separation modules on basis of product specification of module set with different air pressure requirements
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Also Published As

Publication number Publication date
HU9900988D0 (en) 1999-06-28
DE19815885A1 (en) 1999-10-14
CZ297724B6 (en) 2007-03-14
AT230098T (en) 2003-01-15
HU9900988A2 (en) 2003-06-28
PL191500B1 (en) 2006-05-31
EP0949471A1 (en) 1999-10-13
CZ9901213A3 (en) 2001-02-14
PL332409A1 (en) 1999-10-11
US6185960B1 (en) 2001-02-13

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