DE102010052544A1 - Process for obtaining a gaseous product by cryogenic separation of air - Google Patents

Process for obtaining a gaseous product by cryogenic separation of air Download PDF

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Publication number
DE102010052544A1
DE102010052544A1 DE102010052544A DE102010052544A DE102010052544A1 DE 102010052544 A1 DE102010052544 A1 DE 102010052544A1 DE 102010052544 A DE102010052544 A DE 102010052544A DE 102010052544 A DE102010052544 A DE 102010052544A DE 102010052544 A1 DE102010052544 A1 DE 102010052544A1
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Prior art keywords
air
pressure
partial flow
compressor
stream
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DE102010052544A
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German (de)
Inventor
Alexander Alekseev
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Linde GmbH
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Linde GmbH
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Priority to DE102010052544A priority Critical patent/DE102010052544A1/en
Priority to EP10015789 priority
Priority claimed from CN2011104340028A external-priority patent/CN102564064A/en
Publication of DE102010052544A1 publication Critical patent/DE102010052544A1/en
Withdrawn legal-status Critical Current

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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
    • F25J3/04248Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • 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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    • 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
    • F25J3/04024Providing 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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    • F25J3/04048Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams
    • F25J3/04054Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams of air
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    • 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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    • F25J3/04109Arrangements of compressors and /or their drivers
    • F25J3/04115Arrangements of compressors and /or their drivers characterised by the type of prime driver, e.g. hot gas expander
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    • F25J3/04151Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04163Hot end purification of the feed air
    • F25J3/04169Hot end purification of the feed air by adsorption of the impurities
    • F25J3/04175Hot end purification of the feed air by adsorption of the impurities at a pressure of substantially more than the highest pressure column
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    • F25J2245/40Processes or apparatus involving steps for recycling of process streams the recycled stream being air

Abstract

Das Verfahren dient zur Erzeugung eines gasförmigen Sauerstoff-Druckprodukts durch Tieftemperaturzerlegung von Luft in einem Destilliersäulen-System, das mindestens eine Niederdrucksäule (90) und eine Hochdrucksäule (80) aufweist. Einsatzluft (1) wird in einem Luftverdichter (2) verdichtet. Die verdichtete Einsatzluft (3) wird mindestens zum Teil in einer Reinigungseinrichtung (5) gereinigt. Mindestens ein Teil (7) der gereinigten Einsatzluft (6) wird in einem warmen Nachverdichter (8) nachverdichtet. Ein erster Teilstrom (11, 15) der gereinigten Einsatzluft (6) wird in einer ersten Entspannungsmaschine (16) arbeitsleistend entspannt und mindestens zum Teil in die Hochdrucksäule (80) eingeleitet (17). Ein zweiter Teilstrom (12) der gereinigten Einsatzluft (6) wird in einem Hauptwärmetauscher (14) auf eine Zwischentemperatur abgekühlt, in einem Kaltverdichter (19) nachverdichtet, im Hauptwärmetauscher (14) weiter abgekühlt und verflüssigt oder pseudo-verflüssigt und anschließend in das Destilliersäulen-System eingeleitet (21, 23). Ein dritter Teilstrom (13) der verdichteten Einsatzluft (3) wird in einer zweiten Entspannungsmaschine (25) arbeitsleistend entspannt. Ein flüssiger Sauerstoff-Produktstrom (30, 32) wird aus dem Destilliersäulen-System entnommen, in flüssigem Zustand auf einen erhöhten Druck gebracht (34), unter diesem erhöhten Druck im Hauptwärmetauscher (14) verdampft oder pseudo-verdampft, auf etwa Umgebungstemperatur angewärmt und schließlich als gasförmiger Sauerstoff-Druckproduktstrom (33) abgezogen. Die beiden Entspannungsmaschinen (16, 25) sind mit je einem der beiden Maschinen, dem warmen Nachverdichter (8) und dem Kaltverdichter (18, 19) gekoppelt. Mindestens ein Teil des arbeitsleistend entspannten dritten Teilstroms (26) wird zum Luftverdichter (28) zurückgeleitet.The method is used to produce a gaseous oxygen pressure product by low-temperature separation of air in a distillation column system which has at least one low-pressure column (90) and one high-pressure column (80). Feed air (1) is compressed in an air compressor (2). The compressed feed air (3) is cleaned at least in part in a cleaning device (5). At least part (7) of the cleaned feed air (6) is post-compressed in a warm post-compressor (8). A first partial flow (11, 15) of the cleaned feed air (6) is expanded in a first expansion machine (16) while performing work and at least partially introduced (17) into the high-pressure column (80). A second partial flow (12) of the cleaned feed air (6) is cooled to an intermediate temperature in a main heat exchanger (14), post-compressed in a cold compressor (19), cooled further in the main heat exchanger (14) and liquefied or pseudo-liquefied and then into the distillation column System initiated (21, 23). A third partial stream (13) of the compressed feed air (3) is expanded in a second expansion machine (25) while performing work. A liquid oxygen product stream (30, 32) is removed from the distillation column system, brought to an increased pressure (34) in the liquid state, evaporated or pseudo-evaporated under this increased pressure in the main heat exchanger (14), warmed to about ambient temperature and finally withdrawn as a gaseous oxygen pressure product stream (33). The two expansion machines (16, 25) are each coupled to one of the two machines, the warm post-compressor (8) and the cold compressor (18, 19). At least a portion of the third partial stream (26) which is relaxed during work is returned to the air compressor (28).

Description

  • Die Erfindung betrifft ein Verfahren zur Gewinnung eines gasförmigen Druckprodukts durch Tieftemperaturzerlegung von Luft gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for obtaining a gaseous printed product by cryogenic separation of air according to the preamble of patent claim 1.
  • Verfahren und Vorrichtungen zur Tieftemperaturzerlegung von Luft sind zum Beispiel aus Hausen/Linde, Tieftemperaturtechnik, 2. Auflage 1985, Kapitel 4 (Seiten 281 bis 337) bekannt.For example, methods and apparatus for cryogenic decomposition of air are off Hausen / Linde, Tiefftemperaturtechnik, 2nd edition 1985, chapter 4 (pages 281 to 337) known.
  • Das Destilliersäulen-System der Erfindung kann als Zwei-Säulen-System (zum Beispiel als klassisches Linde-Doppelsäulensystem) ausgebildet sein, oder auch als Drei- oder Mehr-Säulen-System. Es kann zusätzlich zu den Kolonnen zur Stickstoff-Sauerstoff-Trennung weitere Vorrichtungen zur Gewinnung hochreiner Produkte und/oder anderer Luftkomponenten, insbesondere von Edelgasen aufweisen, beispielsweise eine Argongewinnung und/oder eine Krypton-Xenon-Gewinnung.The distillation column system of the invention may be designed as a two-column system (for example as a classic Linde double column system), or as a triple or multi-column system. It may in addition to the columns for nitrogen-oxygen separation, further devices for obtaining high purity products and / or other air components, in particular of noble gases, for example, an argon production and / or a krypton-xenon recovery.
  • Bei dem Prozess wird ein flüssig auf Druck gebrachter Sauerstoff-Produktstrom gegen einen Wärmeträger verdampft und schließlich als gasförmiges Druckprodukt gewonnen. Diese Methode wird auch als Innenverdichtung bezeichnet. Sie dient zur Gewinnung von Drucksauerstoff. Für den Fall eines überkritischen Drucks findet kein Phasenübergang im eigentlichen Sinne statt, der Produktstrom wird dann ”pseudo-verdampft”.In the process, a liquid pressurized oxygen product stream is vaporized against a heat carrier and finally recovered as a gaseous pressure product. This method is also called internal compression. It serves for the production of pressure oxygen. In the case of a supercritical pressure, no phase transition takes place in the true sense, the product stream is then "pseudo-evaporated".
  • Gegen den (pseudo-)verdampfenden Produktstrom wird ein unter hohem Druck stehender Wärmeträger verflüssigt (beziehungsweise pseudo-verflüssigt, wenn er unter überkritischem Druck steht). Der Wärmeträger wird häufig durch einen Teil der Luft gebildet, im vorliegenden Fall von dem ”zweiten Teilstrom” der verdichteten Einsatzluft.Against the (pseudo) evaporating product stream, a high-pressure heat carrier is liquefied (or pseudo-liquefied when it is under supercritical pressure). The heat transfer medium is often formed by part of the air, in the present case by the "second partial flow" of the compressed feed air.
  • Innenverdichtungsverfahren sind zum Beispiel bekannt aus DE 830805 , DE 901542 (= US 2712738 / US 2784572 ), DE 952908 , DE 1103363 (= US 3083544 ), DE 1112997 (= US 3214925 ), DE 1124529 , DE 1117616 (= US 3280574 ), DE 1226616 (= US 3216206 ), DE 1229561 (= US 3222878 ), DE 1199293 , DE 1187248 (= US 3371496 ), DE 1235347 , DE 1258882 (= US 3426543 ), DE 1263037 (= US 3401531 ), DE 1501722 (= US 3416323 ), DE 1501723 (= US 3500651 ), DE 253132 (= US 4279631 ), DE 2646690 , EP 93448 B1 (= US 4555256 ), EP 384483 B1 (= US 5036672 ), EP 505812 B1 (= US 5263328 ), EP 716280 B1 (= US 5644934 ), EP 842385 B1 (= US 5953937 ), EP 758733 B1 (= US 5845517 ), EP 895045 B1 (= US 6038885 ), DE 19803437 A1 , EP 949471 B1 (= US 6185960 B1 ), EP 955509 A1 (= US 6196022 B1 ), EP 1031804 A1 (= US 6314755 ), DE 19909744 A1 , EP 1067345 A1 (= US 6336345 ), EP 1074805 A1 (= US 6332337 ), DE 19954593 A1 , EP 1134525 A1 (= US 6477860 ), DE 10013073 A1 , EP 1139046 A1 , EP 1146301 A1 , EP 1150082 A1 , EP 1213552 A1 , DE 10115258 A1 , EP 1284404 A1 (= US 2003051504 A1 ), EP 1308680 A1 (= US 6612129 B2 ), DE 10213212 A1 , DE 10213211 A1 , EP 1357342 A1 oder DE 10238282 A1 DE 10302389 A1 , DE 10334559 A1 , DE 10334560 A1 , DE 10332863 A1 , EP 1544559 A1 , EP 1585926 A1 , DE 102005029274 A1 EP 1666824 A1 , EP 1672301 A1 , DE 102005028012 A1 , WO 2007033838 A1 , WO 2007104449 A1 , EP 1845324 A1 , DE 102006032731 A1 , EP 1892490 A1 , DE 102007014643 A1 , Al, EP 2015012 A2 , EP 2015013 A2 , EP 2026024 A1 , WO 2009095188 A2 oder DE 102008016355 A1 .Internal compression methods are known, for example DE 830805 . DE 901542 (= US 2712738 / US 2784572 ) DE 952908 . DE 1103363 (= US 3,083,544 ) DE 1112997 (= US 3214925 ) DE 1124529 . DE 1117616 (= US 3280574 ) DE 1226616 (= US 3216206 ) DE 1229561 (= US 3222878 ) DE 1199293 . DE 1187248 (= US 3371496 ) DE 1235347 . DE 1258882 (= US 3426543 ) DE 1263037 (= US 3401531 ) DE 1501722 (= US 3,416,323 ) DE 1501723 (= US 3,500,651 ) DE 253132 (= US 4279631 ) DE 2646690 , EP 93448 B1 (= US 4555256 ) EP 384483 B1 (= US 5036672 ) EP 505812 B1 (= US 5263328 ) EP 716280 B1 (= US 5644934 ) EP 842385 B1 (= US 5953937 ) EP 758733 B1 (= US 5845517 ) EP 895045 B1 (= US 6038885 ) DE 19803437 A1 . EP 949471 B1 (= US 6,189,960 B1 ) EP 955509 A1 (= US 6196022 B1 ) EP 1031804 A1 (= US 6314755 ) DE 19909744 A1 . EP 1067345 A1 (= US 6336345 ) EP 1074805 A1 (= US 6332337 ) DE 19954593 A1 . EP 1134525 A1 (= US 6477860 ) DE 10013073 A1 . EP 1139046 A1 . EP 1146301 A1 . EP 1150082 A1 . EP 1213552 A1 . DE 10115258 A1 . EP 1284404 A1 (= US 2003051504 A1 ) EP 1308680 A1 (= US 6612129 B2 ) DE 10213212 A1 . DE 10213211 A1 . EP 1357342 A1 or DE 10238282 A1 DE 10302389 A1 . DE 10334559 A1 . DE 10334560 A1 . DE 10332863 A1 . EP 1544559 A1 . EP 1585926 A1 . DE 102005029274 A1 EP 1666824 A1 . EP 1672301 A1 . DE 102005028012 A1 . WO 2007033838 A1 . WO 2007104449 A1 . EP 1845324 A1 . DE 102006032731 A1 . EP 1892490 A1 . DE 102007014643 A1 , Al, EP 2015012 A2 . EP 2015013 A2 . EP 2026024 A1 . WO 2009095188 A2 or DE 102008016355 A1 ,
  • Der Begriff ”Entspannungsmaschine” umfasst jede Maschine zur arbeitsleistenden Entspannung eines Prozessstroms. Bevorzugt werden die Entspannungsmaschinen bei der Erfindung durch Expansionsturbinen gebildet.The term "expansion machine" includes any machine for work-relaxing a process stream. Preferably, the expansion machines are formed in the invention by expansion turbines.
  • Der ”Hauptwärmetauscher” kann aus einem oder mehreren parallel und/oder seriell verbundenen Wärmetauscherabschnitten gebildet sein, zum Beispiel aus einem oder mehreren Plattenwärmetauscher-Blöcken. Er dient zur Abkühlung der Einsatzluftströme in indirektem Wärmeaustausch mit Rückströmen aus dem Destilliersäulen-System.The "main heat exchanger" may be formed of one or more parallel and / or serially connected heat exchanger sections, for example one or more plate heat exchanger blocks. It serves to cool the feed air streams in indirect heat exchange with return streams from the distillation column system.
  • Diese Anmeldung umfasst auch die Offenbarung der gleichzeitig eingereichten deutschen Patentanmeldung (internes Aktenzeichen P10C124-DE = IC0362a), die im Folgenden als ”Parallelanmeldung” bezeichnet wird, sowie die Offenbarung der zu dieser Parallelanmeldung korrespondierenden Anmeldungen.This application also includes the disclosure of the concurrently filed German patent application (internal reference P10C124-DE = IC0362a), which is referred to below as "parallel application", as well as the disclosure of the corresponding to this application in parallel applications.
  • Ein Verfahren der eingangs genannten Art ist aus WO 2008110734 A2 bekannt. Bei diesem Prozess ist entscheidend, dass die zweite Entspannungsmaschine abschaltbar ist und der gesamte dritte Teilstrom stromabwärts der zweiten Entspannungsmaschine in die Atmosphäre abgeblasen wird, damit er die Rektifikation nicht stört.A method of the type mentioned is out WO 2008110734 A2 known. In this process, it is crucial that the second expansion machine is switched off and the entire third partial stream is blown off into the atmosphere downstream of the second expansion machine, so that it does not disturb the rectification.
  • Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art und eine entsprechende Vorrichtung anzugeben, die wirtschaftlich besonders günstig zu betreiben sind.The invention is therefore based on the object to provide a method of the type mentioned above and a corresponding device, which are economically particularly favorable to operate.
  • Diese Aufgabe wird durch das Verfahren gemäß Patentanspruch 1 gelöst.This object is achieved by the method according to claim 1.
  • Bei dem erfindungsgemäßen Verfahren wird mindestens ein Teil der Luft aus der zweiten Entspannungsmaschine (dritter Teilstrom) nicht verworfen, sondern in den Luftverdichter zurückgeführt. Damit wird einerseits die Ausbeute der Anlage erhöht; andererseits kann die zweite Entspannungsmaschine nach wie vor mit einem besonders niedrigen Austrittsdruck, also mit relativ hoher Leistung, betrieben werden.In the method according to the invention at least a portion of the air from the second expansion machine (third partial flow) is not discarded, but returned to the air compressor. Thus, on the one hand, the yield of the system is increased; On the other hand, the second expansion machine can still be operated with a particularly low outlet pressure, ie with relatively high power.
  • Vorzugsweise ist der Austrittsdruck der zweiten Entspannungsmaschine etwa gleich dem Betriebsdruck der Niederdrucksäule (plus Leitungsverlusten).Preferably, the outlet pressure of the second expansion machine is approximately equal to the operating pressure of the low-pressure column (plus line losses).
  • Im Rahmen der Erfindung kann der gesamte dritte Teilstrom in den Luftverdichter eingeführt werden. Vorzugsweise werden mindestens 30%, insbesondere mindestens 50% des arbeitsleistend entspannten dritten Teilstroms in die Niederdrucksäule eingeleitet. (Als ”dritter Teilstrom” wird an dieser Stelle der gesamte durch die zweite Entspannungsmaschine geführte Luftstrom bezeichnet.) Der Rest des arbeitsleistend entspannten dritten Teilstroms oder ein Teil davon kann in die Niederdrucksäule eingespeist werden.In the context of the invention, the entire third partial flow can be introduced into the air compressor. Preferably, at least 30%, in particular at least 50% of the work-performing expanded third partial stream is introduced into the low-pressure column. (The term "third partial flow" here refers to the entire air flow guided through the second expansion machine.) The remainder of the work-stream-relaxing third partial flow or a part thereof can be fed into the low-pressure column.
  • Die Zuführung des arbeitsleistenden dritten Teilstroms (oder eines Teils davon) in den Luftverdichter kann beispielsweise am Eintritt vorgenommen werden. Alternativ findet diese Zuführung an einer Zwischenstufe des Luftverdichters statt, wobei der Luftverdichter mehrstufig ausgebildet ist und mindestens eine erste und eine letzte Stufe aufweist, wobei mindestens ein Teil des arbeitsleistend entspannten dritten Teilstroms dem Luftverdichter stromabwärts der ersten Stufe und stromaufwärts der letzten Stufe zurückgeführt wird.The supply of the working third partial flow (or a part thereof) in the air compressor can be made for example at the entrance. Alternatively, this supply takes place at an intermediate stage of the air compressor, wherein the air compressor is designed in several stages and has at least a first and a last stage, wherein at least a part of the work-performing expanded third partial flow is returned to the air compressor downstream of the first stage and upstream of the last stage.
  • Die Abzweigung des dritten Teilstroms aus der Einsatzluft kann zum Beispiel stromabwärts der Reinigungsvorrichtung durchgeführt werden, etwa unmittelbar stromaufwärts des Nachverdichters, stromabwärts des Nachverdichters oder auch stromabwärts der ersten Entspannungsmaschine erfolgen. Vorzugsweise wird der dritte Teilstrom jedoch stromaufwärts der Reinigungseinrichtung aus der gereinigten Einsatzluft abgezweigt.The diversion of the third partial stream from the feed air can, for example, be carried out downstream of the cleaning device, for example immediately upstream of the postcompressor, downstream of the postcompressor or also downstream of the first expansion machine. However, the third partial stream is preferably branched off from the purified feed air upstream of the cleaning device.
  • Luftzerlegungsanlagen der eingangs genannten Art weisen regelmäßig eine Vorkühlvorrichtung auf, in der die verdichtete Einsatzluft stromaufwärts der Reinigungsvorrichtung durch direkten oder indirekten Wärmeaustausch mit Kühlwasser abgekühlt wird, um die Verdichtungswärme zu entfernen. In diesem Fall kann der dritte Teilstrom stromaufwärts der Vorkühlvorrichtung aus der gereinigten Einsatzluft abgezweigt werden. Dieses Merkmal der Erfindung, nämlich die Abzweigung eines Teilluftstroms stromaufwärts der Vorkühleinrichtung mit anschließender arbeitsleistender Entspannung und Rückführung in den Luftverdichter und/oder Ablassen in die Atmosphäre kann grundsätzlich bei jedem Tieftemperatur-Luftzerlegungsverfahren angewendet werden, auch ohne die weiter oben angeführten Merkmale; dies gilt insbesondere dann, wenn Kälte in einer weiteren Entspannungsmaschine (hier: der ersten Entspannungsmaschine) erzeugt wird und beide Entspannungsmaschinen mechanisch mit Nachverdichter gekoppelt sind, insbesondere eine mit einem Kaltverdichter und die andere mit einem warmen Nachverdichter.Air separation plants of the aforementioned type regularly have a precooling device, in which the compressed feed air upstream of the cleaning device is cooled by direct or indirect heat exchange with cooling water in order to remove the heat of compression. In this case, the third partial stream upstream of the pre-cooling device can be branched off from the purified feed air. This feature of the invention, namely the diversion of a partial air flow upstream of the pre-cooler with subsequent work expansion and return to the air compressor and / or venting to the atmosphere, can be applied in principle to any cryogenic air separation process, even without the above mentioned features; This is especially true when cold is generated in another expansion machine (here: the first expansion machine) and both expansion machines are mechanically coupled with additional compressor, in particular one with a cold compressor and the other with a warm booster.
  • Alternativ oder zusätzlich ein Teil des arbeitsleistend entspannten dritten Teilstroms in die Atmosphäre abgelassen wird. Dies kann insbesondere dann sinnvoll sein, wenn der Austrittsdruck der zweiten Entspannungsmaschine auf dem Niveau des Niederdrucksäulendrucks liegt.Alternatively or additionally, a part of the work-performing expanded third partial flow is discharged into the atmosphere. This may be useful, in particular, when the outlet pressure of the second expansion machine is at the level of the low-pressure column pressure.
  • Bei dem erfindungsgemäßen Verfahren kann die gesamte Einsatzluft gemeinsam in dem warmen Nachverdichter nachverdichtet werden, also insbesondere der erste, der zweite und der dritte Teilstrom. (Eventuell für andere Zwecke abgezweigte Luftteile, so genannte Instrumentenluft, werden hier nicht zur ”gesamten Einsatzluft” gezählt.) Die Abzweigung des dritten Teilstroms von anderen Luftteilen findet dann stromabwärts des warmen Nachverdichters statt. Diese Verfahrensweise ist insbesondere bei serieller Verbindung der Turbinen sinnvoll, kann aber auch bei Parallelschaltung eingesetzt werden.In the method according to the invention, the total feed air can be compressed together in the warm after-compressor, ie in particular the first, the second and the third partial flow. (Air ducts possibly diverted for other purposes, so-called instrument air, are not counted here as "total feed air".) The diversion of the third partial flow from other air parts then takes place downstream of the warm after-compressor. This procedure is particularly useful for serial connection of the turbines, but can also be used in parallel connection.
  • Luftzerlegungsanlagen der eingangs genannten Art weisen regelmäßig eine Vorkühlungseinrichtung aus, in der die Luft stromaufwärts der Reinigungsvorrichtung in direktem oder indirektem Wärmeaustausch mit Alternativ werden der erste und der zweite Teilstrom in dem warmen Nachverdichter nachverdichtet, und der dritte Teilstrom wird an dem warmen Nachverdichter vorbeigeführt. Die Abzweigung des dritten Teilstroms von anderen Luftteilen findet hier stromaufwärts des warmen Nachverdichters statt.Air separation plants of the aforementioned type regularly have a pre-cooling device, in which the air upstream of the cleaning device in direct or indirect heat exchange with alternative, the first and the second partial stream are recompressed in the warm booster, and the third partial flow is passed to the warm booster. The diversion of the third partial flow of other air parts takes place here upstream of the warm after-compressor.
  • In einer weiteren Ausführungsform der Erfindung wird der zweite Teilstrom in dem warmen Nachverdichter nachverdichtet wird, und der erste und der dritte Teilstrom werden an dem warmen Nachverdichter vorbeigeführt. Die Abzweigung des dritten Teilstroms von anderen Luftteilen findet hier ebenfalls stromaufwärts des warmen Nachverdichters beziehungsweise stromabwärts der gemeinsamen Abzweigung von erstem und drittem Teilstrom aus dem gereinigten, aber nicht nachverdichteten Einsatzluftstrom statt.In a further embodiment of the invention, the second partial flow is recompressed in the warm after-compressor, and the first and the third partial flow are conducted past the warm after-compressor. The diversion of the third partial flow of other parts of the air also takes place here upstream of the warm after-compressor or downstream of the common branch of the first and third partial flow from the purified, but not recompressed feed air flow.
  • Zum Beispiel wird der dritte Teilstrom unter etwa dem Austrittsdruck des Luftverdichters beziehungsweise unter etwa dem Austrittsdruck des warmen Nachverdichters in die zweite Entspannungsmaschine eingeführt. In diesem Fall findet die Aufspaltung in den ersten und dritten Teilstrom stromaufwärts der arbeitsleistenden Entspannungen statt. Die beiden Entspannungsmaschinen sind parallel geschaltet.For example, the third partial flow is introduced into the second expansion machine at approximately the outlet pressure of the air compressor or below approximately the outlet pressure of the warm after-compressor. In this case, the splitting into the first and third partial flow takes place upstream of the work-performing depressions. The two relaxation machines are connected in parallel.
  • Alternativ wird der dritte Teilstrom gemeinsam mit dem ersten Teilstrom in der ersten Entspannungsmaschine entspannt und stromabwärts der ersten Entspannungsmaschine getrennt von dem ersten Teilstrom der zweiten Entspannungsmaschine zugeleitet. Die Aufspaltung in den ersten und dritten Teilstrom wird also erst stromaufwärts der ersten Entspannungsmaschine durchgeführt. Die beiden Entspannungsmaschinen sind seriell geschaltet.Alternatively, the third partial flow is expanded together with the first partial flow in the first expansion machine and fed downstream of the first expansion machine separately from the first partial flow of the second expansion machine. The splitting into the first and third partial flow is therefore carried out only upstream of the first expansion machine. The two expansion machines are connected in series.
  • Vorzugsweise stellt bei dem Verfahren der Luftverdichter die einzige mit externer Energie angetriebene Maschine zur Verdichtung von Luft dar. Unter einer ”einzigen Maschine” wird hier ein einstufiger oder mehrstufiger Verdichter verstanden, dessen Stufen alle mit dem gleichen Antrieb verbunden sind, wobei alle Stufen in demselben Gehäuse untergebracht oder mit demselben Getriebe verbunden sind. In diesem Luftverdichter wird vorzugsweise die gesamte Einsatzluft auf einen Druck verdichtet, der deutlich über dem höchsten Druck des Destilliersäulen-Systems, insbesondere deutlich über dem Betriebsdruck der Hochdrucksäule liegt. Dieser Druckunterschied zwischen dem Austrittsdruck des Luftverdichters und dem Betriebsdruck der Hochdrucksäule beträgt beispielsweise mindestens 4 bar und liegt vorzugsweise zwischen 6 und 16 bar. In dieser Variante wird die im Luftverdichter verdichtete Gesamtluft (bis auf mögliche kleinere Anteile wie zum Beispiel Instrumentenluft) vorzugsweise vollständig auf die drei Teilströme aufgeteilt.Preferably, in the method, the air compressor is the only external energy driven machine for compressing air. By a "single machine" is meant here a single stage or multi-stage compressor whose stages are all connected to the same drive, all stages in the same Housing housed or connected to the same gear. In this air compressor, preferably the entire feed air is compressed to a pressure which is significantly above the highest pressure of the distillation column system, in particular significantly above the operating pressure of the high-pressure column. This pressure difference between the outlet pressure of the air compressor and the operating pressure of the high-pressure column is, for example, at least 4 bar and is preferably between 6 and 16 bar. In this variant, the compressed in the air compressor total air (except for possible smaller proportions such as instrument air) is preferably completely divided among the three sub-streams.
  • Außerdem kann beidem Verfahren eine Stickstoff-Innenverdichtung ergänzt werden, indem ein flüssiger Stickstoff-Produktstrom aus dem Destilliersäulen-System entnommen, in flüssigem Zustand auf einen erhöhten Druck gebracht, unter diesem erhöhten Druck im Hauptwärmetauscher verdampft oder pseudo-verdampft, auf etwa Umgebungstemperatur angewärmt und schließlich als gasförmiger Stickstoff-Druckproduktstrom abgezogen wird.In addition, the process can be supplemented with a nitrogen internal compaction by a liquid nitrogen product stream taken from the distillation column system, brought in liquid state to an elevated pressure, vaporized or pseudo-evaporated under this increased pressure in the main heat exchanger, warmed to about ambient temperature and finally withdrawn as gaseous nitrogen pressure product stream.
  • Die Erfindung sowie weitere Einzelheiten der Erfindung werden im Folgenden anhand von in den Zeichnungen schematisch dargestellten Ausführungsbeispielen sowie anhand der Ausführungsbeispiele in der Parallelanmeldung näher erläutert. Hierbei zeigen:The invention and further details of the invention are explained in more detail below with reference to embodiments schematically illustrated in the drawings and with reference to the embodiments in the parallel application. Hereby show:
  • 1 ein erstes Ausführungsbeispiel der Erfindung mit Abzweigung des dritten Teilstroms stromaufwärts der Vorkühlung und 1 a first embodiment of the invention with branching of the third partial stream upstream of the pre-cooling and
  • 2 bis 4 drei weitere Ausführungsbeispiele mit Abzweigung des dritten Teilstroms stromaufwärts der Vorkühlung. 2 to 4 three further embodiments with branching of the third partial flow upstream of the precooling.
  • In 1 wird atmosphärische Luft als Einsatzluft über Leitung 1 von einem Luftverdichter 2 angesaugt und dort auf einen Druck verdichtet, der deutlich höher als der Betriebsdruck der Hochdrucksäule 80 ist. Der Luftverdichter ist hier mehrstufig, insbesondere vier-, fünf- oder sechsstufig ausgebildet, wobei sich zwischen den Stufen je ein Zwischenkühler befindet. Die verdichtete Einsatzluft 3 wird zum größeren Teil 42 einer Vorkühlungsvorrichtung 4 (”Precooling”) zugeführt, in dem die Verdichtungswärme der letzten Stufe des Luftverdichters in direktem oder indirektem Wärmeaustausch mit Kühlwasser entfernt wird. Die vorgekühlte Einsatzluft wird in einer Reinigungseinrichtung 5, die vorzugsweise als Molekularsieb-Adsorber ausgebildet ist, gereinigt. Die verdichtete Einsatzluft 3 wird in dem Ausführungsbeispiel drei Teilströme aufgeteilt:
    • – Ein erster Teilstrom 11 wird nach Abkühlung in einem Hauptwärmetauscher 14 auf eine erste Zwischentemperatur über Leitung 15 der arbeitsleistenden Entspannung in einer ersten Entspannungsmaschine 16 zugeführt und anschließend über Leitung 17 in die Hochdrucksäule 80 des Destilliersäulen-Systems eingeleitet.
    • – Ein zweiter Teilstrom 12 wird im Hauptwärmetauscher 14 auf eine zweite Zwischentemperatur abgekühlt, die niedriger oder höher als die erste Zwischentemperatur oder gleich der ersten Zwischentemperatur ist, über Leitung 18 aus dem Hauptwärmetauscher 14 entnommen, in einem Kaltverdichter 19 weiter verdichtet, bei einer dritten Zwischentemperatur, die höher als die zweite Zwischentemperatur über Leitung 20 wieder in den Hauptwärmetauscher 14 eingeführt und dort weiter abgekühlt und schließlich verflüssigt beziehungsweise – falls der Druck des zweiten Teilstroms überkritisch ist – pseudo-verflüssigt. Der (pseudo-)verflüssigte zweite Teilstrom 21 wird in einem Drosselventil 22 auf etwa den Druck der Hochdrucksäule 80 entspannt und schließlich in die Hochdrucksäule 80 eingeleitet. Ein Teil des entspannten dritten Teilstroms 23 kann auch direkt in die Niederdrucksäule 90 eingespeist werden.
    • – Ein dritter Teilstrom 13 der verdichteten Einsatzluft 3 wird unmittelbar stromaufwärts der Vorkühlvorrichtung 4 abgezweigt und ohne Abkühlung im Hauptwärmetauscher 14 der arbeitsleistenden Entspannung in einer zweiten Entspannungsmaschine 25 zugeführt. Der arbeitsleistend auf einen Druck von beispielsweise 1,2 bis 6 bar, vorzugsweise etwa 1,3 bar entspannte dritte Teilstrom 26 wird in dem Beispiel vollständig über Leitung 28 zum Luftverdichter 2 zurückgeführt und dort in den Gesamtluftstrom eingeleitet, zum Beispiel stromaufwärts der letzten Stufe, insbesondere stromaufwärts eines Zwischenkühlers, der unter passendem Druck betrieben wird.
    In 1 atmospheric air is used as feed air via pipe 1 from an air compressor 2 sucked and there compressed to a pressure which is significantly higher than the operating pressure of the high pressure column 80 is. The air compressor is here in several stages, in particular four, five or six stages, with an intercooler between the stages. The compressed feed air 3 becomes the greater part 42 a pre-cooling device 4 ("Precooling") supplied, in which the compression heat of the last stage of the air compressor is removed in direct or indirect heat exchange with cooling water. The pre-cooled feed air is in a cleaning device 5 , which is preferably designed as a molecular sieve adsorber purified. The compressed feed air 3 In the exemplary embodiment, three partial flows are split up:
    • - A first partial flow 11 becomes after cooling in a main heat exchanger 14 to a first intermediate temperature via line 15 the work-performing relaxation in a first relaxation machine 16 fed and then via line 17 in the high pressure column 80 of the distillation column system.
    • - A second partial flow 12 is in the main heat exchanger 14 cooled to a second intermediate temperature, which is lower or higher than the first intermediate temperature or equal to the first intermediate temperature, via line 18 from the main heat exchanger 14 taken in a cold compressor 19 further compressed, at a third intermediate temperature, which is higher than the second intermediate temperature via line 20 back into the main heat exchanger 14 introduced and further cooled there and finally liquefied or - if the pressure of the second partial flow is supercritical - pseudo-liquefied. The (pseudo) liquefied second substream 21 is in a throttle valve 22 at about the pressure of the high pressure column 80 relaxed and finally into the high-pressure column 80 initiated. Part of the relaxed third partial flow 23 can also directly into the low pressure column 90 be fed.
    • - A third partial flow 13 the compressed feed air 3 becomes immediately upstream of the precooler 4 branched off and without cooling in the main heat exchanger 14 work-performing relaxation in a second relaxation machine 25 fed. The work to a pressure of, for example, 1.2 to 6 bar, preferably about 1.3 bar relaxed third partial flow 26 in the example is completely over line 28 to the air compressor 2 recycled and introduced there in the total air flow, for example, upstream of the last stage, in particular upstream of an intermediate cooler, which is operated under suitable pressure.
  • Der erste und der zweite Teilstrom 11, 13 werden hier gemeinsam über die Leitungen 7 und 10 vom Austritt der Reinigungseinrichtung 5 durch einem warmen Nachverdichter 8 mit Nachkühler 9 zum warmen Ende des Hauptwärmetauschers 14 geführt. The first and the second partial flow 11 . 13 be here together over the lines 7 and 10 from the outlet of the cleaning device 5 through a warm booster 8th with aftercooler 9 to the warm end of the main heat exchanger 14 guided.
  • Ein flüssiger Sauerstoff-Produktstrom 30 wird aus der Niederdrucksäule 90 entnommen, in einer Pumpe 31 in flüssigem Zustand auf einen erhöhten Druck gebracht (52), unter diesem erhöhten Druck im Hauptwärmetauscher verdampft oder, falls der Druck höher als der kritische Druck ist, pseudo-verdampft, auf etwa Umgebungstemperatur angewärmt und schließlich als gasförmiger Sauerstoff-Druckproduktstrom 33 abgezogen.A liquid oxygen product stream 30 gets out of the low pressure column 90 taken in a pump 31 brought to an elevated pressure in the liquid state ( 52 ) vaporized under this elevated pressure in the main heat exchanger or, if the pressure is higher than the critical pressure, pseudo-evaporated, warmed to about ambient temperature, and finally as a gaseous oxygen pressure product stream 33 deducted.
  • Auch ein Stickstoff-Druckprodukt kann mittels Innenverdichtung gewonnen werden. Hierzu wird ein flüssiger Stickstoff-Produktstrom aus der Hochdrucksäule oder deren Kopfkondensator, dem Hauptkondensator entnommen, in einer Pumpe in flüssigem Zustand auf einen erhöhten Druck gebracht, unter diesem erhöhten Druck (Leitung 41) im Hauptwärmetauscher verdampft oder, falls der Druck höher als der kritische Druck ist, pseudo-verdampft, auf etwa Umgebungstemperatur angewärmt und schließlich als gasförmiger Stickstoff-Druckproduktstrom (42) abgezogen werden.A nitrogen-pressure product can also be obtained by means of internal compression. For this purpose, a liquid nitrogen product stream from the high-pressure column or its top condenser, taken from the main condenser, brought to a higher pressure in a pump in the liquid state, under this increased pressure (line 41 ) vaporized in the main heat exchanger or, if the pressure is higher than the critical pressure, pseudo-evaporated, warmed to about ambient temperature, and finally as a gaseous nitrogen pressure product stream ( 42 ) subtracted from.
  • Weitere Rückströme aus dem Destilliersäulen-System sind gasförmiger Sauerstoff 36, unreiner Stickstoff 35 und reiner Stickstoff 36. Außerdem können Flüssigsauerstoff und Flüssigstickstoff sowohl aus der Hochdrucksäule als auch aus der Niederdrucksäule entnommen werden. Die gasförmige Produkte werden im Hauptwärmetauscher 14 auf etwa Umgebungstemperatur angewärmt und schließlich über die Leitungen 37, 38 und 39 abgezogen.Other reflux streams from the distillation column system are gaseous oxygen 36 , impure nitrogen 35 and pure nitrogen 36 , In addition, liquid oxygen and liquid nitrogen can be taken from both the high pressure column and the low pressure column. The gaseous products are in the main heat exchanger 14 warmed to about ambient temperature and finally over the lines 37 . 38 and 39 deducted.
  • In der fakultativen Passagengruppe 40 des Hauptwärmetauschers 14 kann der zweite Teilstrom 7 stromaufwärts des warmen Nachverdichters 8 vorgekühlt werden. Der Nachkühler kann dann unter Umständen entfallen.In the optional passage group 40 the main heat exchanger 14 can the second partial flow 7 upstream of the warm booster 8th be pre-cooled. The aftercooler may then be omitted under certain circumstances.
  • 2 unterscheidet sich in folgenden Details von 1:
    • – Der erste Teilstrom 11 wird über Leitung 210 am warmen Nachverdichter 8 vorbeigeführt.
    • – Der dritte Teilstrom 13 wird stromabwärts von Vorkühlung 4 und Reinigungseinrichtung 5 vom zweiten Teilstrom 7, 12 abgezweigt und dann über Leitung 210 gemeinsam mit dem ersten Teilstrom zum warmen Ende des Hauptwärmetauschers 14 geführt. Anschließend wird der dritte Teilstrom 13 im Hauptwärmetauscher 14 auf eine Zwischentemperatur abgekühlt und über Leitung 24 unter dieser Zwischentemperatur zur arbeitsleistenden Entspannung 25 geführt.
    • – Der arbeitsleistend entspannte dritte Teilstrom 28 wird im Hauptwärmetauscher 14 auf etwa Umgebungstemperatur angewärmt und strömt über Leitung 29 zurück zum Luftverdichter 2.
    • – Durch den Hauptwärmetauscher 14 wird ein Rückstrom weniger geführt (41/42 in 1).
    2 differs in the following details of 1 :
    • - The first partial flow 11 will be over line 210 on the warm booster 8th past.
    • - The third partial flow 13 becomes downstream of pre-cooling 4 and cleaning device 5 from the second partial flow 7 . 12 branched off and then over line 210 together with the first partial flow to the warm end of the main heat exchanger 14 guided. Subsequently, the third partial flow 13 in the main heat exchanger 14 cooled to an intermediate temperature and via line 24 below this intermediate temperature for work-relaxing 25 guided.
    • - The work-performing relaxed third partial flow 28 is in the main heat exchanger 14 warmed to about ambient temperature and flows via line 29 back to the air compressor 2 ,
    • - Through the main heat exchanger 14 a return current is conducted less ( 41 / 42 in 1 ).
  • 3 unterscheidet sich in folgenden Details von 2:
    • – Der dritte Teilstrom 13 wird vor der arbeitsleistenden Entspannung 25 nicht im Hauptwärmetauscher 14 abgekühlt, sondern direkt zur Entspannungsmaschine geführt.
    • – Der arbeitsleistend entspannte dritte Teilstrom 28 wird nur zu einem ersten Teil über die Leitungen 28 und 29 wie in 2 geführt: ein zweiter Teil wird über die Leitungen 27, 227 durch den kalten Teil des Hauptwärmetauschers 14 zur Niederdrucksäule (LPC) des Destilliersäulensystems geleitet.
    3 differs in the following details of 2 :
    • - The third partial flow 13 will relax before work 25 not in the main heat exchanger 14 cooled, but led directly to the relaxation machine.
    • - The work-performing relaxed third partial flow 28 only becomes a first part over the wires 28 and 29 as in 2 led: a second part is over the lines 27 . 227 through the cold part of the main heat exchanger 14 directed to the low pressure column (LPC) of the distillation column system.
  • 4 unterscheidet sich in folgendem Detail von 2:
    • – Der arbeitsleistend entspannte dritte Teilstrom 28 wird über Leitung 329 zum Eintritt des Luftverdichters 2 zurückgeführt.
    4 differs in the following detail of 2 :
    • - The work-performing relaxed third partial flow 28 will be over line 329 to the entry of the air compressor 2 recycled.
  • Alle Ausführungsbeispiele der Parallelanmeldung welche die Rückführung mindestens eines Teils des arbeitsleistend entspannten dritten Teilstroms zum Luftverdichter zeigen, sind auch Ausführungsbeispiele der vorliegenden Erfindung. Immer wenn der dritte Teilstrom stromaufwärts der zweiten Entspannungsmaschine nicht nachverdichtet wird, kann er analog zu der hier anhängenden Zeichnung stromaufwärts der Reinigungsvorrichtung und entweder stromaufwärts oder stromabwärts der Vorkühlvorrichtung aus der verdichteten Einsatzluft abgezweigt werden.All embodiments of the parallel application which show the return of at least a portion of the working expanded third partial flow to the air compressor, are also embodiments of the present invention. Whenever the third partial stream upstream of the second expansion machine is not recompressed, it can be branched off from the compressed feed air upstream of the cleaning device and either upstream or downstream of the precooling device, analogously to the attached drawing.
  • In Abwandlung sämtlicher Ausführungsbeispiele können ein oder mehrere Teile des arbeitsleistend entspannten dritten Teilstroms 26 an andere Stellen des Luftverdichters, in die Niederdrucksäule und/oder in die Atmosphäre geleitet werden.In a modification of all embodiments, one or more parts of the work-performing relaxed third partial flow 26 be directed to other locations of the air compressor, in the low-pressure column and / or in the atmosphere.
  • ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
  • Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
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Claims (10)

  1. Verfahren zur Erzeugung eines gasförmigen Sauerstoff-Druckprodukts durch Tieftemperaturzerlegung von Luft in einem Destilliersäulen-System, das mindestens eine Niederdrucksäule (90) und eine Hochdrucksäule (80) aufweist, wobei bei dem Verfahren – Einsatzluft (1) in einem Luftverdichter (2) verdichtet wird, – die verdichtete Einsatzluft (3) mindestens zum Teil in einer Reinigungseinrichtung (5) gereinigt wird, – mindestens ein Teil (7) der gereinigten Einsatzluft (6) in einem warmen Nachverdichter (8) nachverdichtet wird, – ein erster Teilstrom (11, 15) der gereinigten Einsatzluft (6) in einer ersten Entspannungsmaschine (16) arbeitsleistend entspannt wird, und mindestens zum Teil in die Hochdrucksäule (80) eingeleitet (17) wird, – ein zweiter Teilstrom (12) der gereinigten Einsatzluft (6) in einem Hauptwärmetauscher (14) auf eine Zwischentemperatur abgekühlt, in einem Kaltverdichter (19) nachverdichtet, im Hauptwärmetauscher (14) weiter abgekühlt und verflüssigt oder pseudo-verflüssigt und anschließend in das Destilliersäulen-System eingeleitet (21, 23) wird, – ein dritter Teilstrom (13) der verdichteten Einsatzluft (3) in einer zweiten Entspannungsmaschine (25) arbeitsleistend entspannt wird, – ein flüssiger Sauerstoff-Produktstrom (30, 32) aus dem Destilliersäulen-System entnommen, in flüssigem Zustand auf einen erhöhten Druck gebracht (34), unter diesem erhöhten Druck im Hauptwärmetauscher (14) verdampft oder pseudo-verdampft, auf etwa Umgebungstemperatur angewärmt und schließlich als gasförmiger Sauerstoff-Druckproduktstrom (33) abgezogen wird, – die beiden Entspannungsmaschinen (16, 25) mit je einem der beiden Maschinen, dem warmen Nachverdichter (8) und dem Kaltverdichter (18, 19) gekoppelt sind, dadurch gekennzeichnet, dass – mindestens ein Teil des arbeitsleistend entspannten dritten Teilstroms (26) zum Luftverdichter (28) zurückgeleitet wird.A process for producing a gaseous oxygen pressure product by cryogenic separation of air in a distillation column system comprising at least one low pressure column ( 90 ) and a high pressure column ( 80 ), wherein in the process - feed air ( 1 ) in an air compressor ( 2 ), - the compressed feed air ( 3 ) at least partly in a cleaning device ( 5 ), - at least one part ( 7 ) of the purified feed air ( 6 ) in a warm booster ( 8th ), - a first partial flow ( 11 . 15 ) of the purified feed air ( 6 ) in a first expansion machine ( 16 ) is released work-performing, and at least partially in the high-pressure column ( 80 ) ( 17 ), - a second partial flow ( 12 ) of the purified feed air ( 6 ) in a main heat exchanger ( 14 ) cooled to an intermediate temperature, in a cold compressor ( 19 ), in the main heat exchanger ( 14 ) and liquefied or pseudo-liquefied and then introduced into the distillation column system ( 21 . 23 ), - a third partial flow ( 13 ) of the compressed feed air ( 3 ) in a second expansion machine ( 25 ) is released, a liquid oxygen product stream ( 30 . 32 ) taken from the distillation column system, brought in the liquid state to an elevated pressure ( 34 ), under this increased pressure in the main heat exchanger ( 14 ) is vaporized or pseudo-evaporated, warmed to about ambient temperature, and finally heated as a gaseous oxygen pressure product stream ( 33 ), - the two expansion machines ( 16 . 25 ) with one of the two machines, the warm booster ( 8th ) and the cold compressor ( 18 . 19 ), characterized in that - at least a part of the work-performing relaxed third partial flow ( 26 ) to the air compressor ( 28 ) is returned.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Luftverdichter (2) mehrstufig ausgebildet ist und mindestens eine erste und eine letzte Stufe aufweist, wobei mindestens ein Teil des arbeitsleistend entspannten dritten Teilstroms (26) dem Luftverdichter (2) stromabwärts der ersten Stufe und stromaufwärts der letzten Stufe zurückgeführt (28) wird.Method according to claim 1, characterized in that the air compressor ( 2 ) is formed in a plurality of stages and has at least one first and one last stage, wherein at least a part of the work-performing relaxed third partial stream ( 26 ) the air compressor ( 2 ) downstream of the first stage and upstream of the last stage ( 28 ) becomes.
  3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass der der dritte Teilstrom (13) stromaufwärts der Reinigungseinrichtung (5) aus der gereinigten Einsatzluft (3) abgezweigt wird.Method according to one of claims 1 or 2, characterized in that the third partial flow ( 13 ) upstream of the cleaning device ( 5 ) from the purified feed air ( 3 ) is diverted.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass ein Teil (6) der verdichteten Einsatzluft (3), der den ersten und den zweiten Teilstrom umfasst, stromaufwärts der Reinigungseinrichtung (5) in einer Vorkühlvorrichtung (4) abgekühlt wird und der dritte Teilstrom (13) stromaufwärts der Vorkühlvorrichtung (4) aus der gereinigten Einsatzluft (3) abgezweigt wird.Method according to claim 3, characterized in that a part ( 6 ) of the compressed feed air ( 3 ), which comprises the first and the second partial stream, upstream of the cleaning device ( 5 ) in a precooling device ( 4 ) and the third substream ( 13 ) upstream of the precooling device ( 4 ) from the purified feed air ( 3 ) is diverted.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass ein Teil des arbeitsleistend entspannten dritten Teilstroms (26) in die Atmosphäre abgelassen wird.Method according to one of claims 1 to 4, characterized in that a part of the work-performing relaxed third partial flow ( 26 ) is discharged into the atmosphere.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der erste und der zweite Teilstrom in dem warmen Nachverdichter (8) nachverdichtet werden und der dritte Teilstrom (13) an dem warmen Nachverdichter (8) vorbeigeführt wird.Method according to one of claims 1 to 5, characterized in that the first and the second partial flow in the warm booster ( 8th ) and the third sub-stream ( 13 ) on the warm booster ( 8th ) is passed.
  7. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der zweite Teilstrom in dem warmen Nachverdichter nachverdichtet wird und der erste Teilstrom an dem warmen Nachverdichter vorbeigeführt. wird.Method according to one of claims 1 to 5, characterized in that the second partial flow is recompressed in the warm after-compressor and the first partial flow past the warm after-compressor. becomes.
  8. Verfahren nach einem der Ansprüche 1 bis 0, dadurch gekennzeichnet, dass der dritte Teilstrom (13) unter etwa dem Austrittsdruck des Luftverdichters in die zweite Entspannungsmaschine (25) eingeführt wird.Method according to one of claims 1 to 0, characterized in that the third partial flow ( 13 ) below about the outlet pressure of the air compressor in the second expansion machine ( 25 ) is introduced.
  9. Verfahren nach einem der Ansprüche 1 bis 0, dadurch gekennzeichnet, dass der Luftverdichter (2) die einzige mit externer Energie angetriebene Maschine zur Verdichtung von Luft darstellt.Method according to one of claims 1 to 0, characterized in that the air compressor ( 2 ) represents the only external energy driven machine for compressing air.
  10. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass ein flüssiger Stickstoff-Produktstrom aus dem Destilliersäulen-System entnommen, in flüssigem Zustand auf einen erhöhten Druck gebracht, unter diesem erhöhten Druck im Hauptwärmetauscher verdampft oder pseudo-verdampft, auf etwa Umgebungstemperatur angewärmt und schließlich als gasförmiger Stickstoff-Druckproduktstrom abgezogen wird.Method according to one of claims 1 to 9, characterized in that a liquid nitrogen product stream taken from the distillation column system, brought in the liquid state to an elevated pressure, evaporated under this increased pressure in the main heat exchanger or pseudo-evaporated, heated to about ambient temperature and finally withdrawn as a gaseous nitrogen pressure product stream.
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US13/303,384 US20120131952A1 (en) 2010-11-25 2011-11-23 Method for recovering a gaseous pressure product by low-temperature separation of air
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