Global Patent Index - EP 1052465 A1

EP 1052465 A1 2000-11-15 - Process and device for cryogenic air separation

Title (en)

Process and device for cryogenic air separation

Title (de)

Verfahren und Vorrichtung zur Tieftemperaturzerlegung von Luft

Title (fr)

Procédé et appareil pour la séparation cryogénique de l'air

Publication

EP 1052465 A1 (DE)

Application

EP 99112289 A

Priority

DE 19921949 A

Abstract (en)

To maintain very low air temps., the intake air (1) is passed to an initial rectifying column (3). An overflow fraction (6,7 a given density (p) is taken in a liquid condition from a reservoir (24,16) within the first column (3), is relaxed (14,14a,18), transferred to a further process stage (5,23). The liquid level in the reservoir (24,16) is at a first level (h1) and an initial pressure (p1). The relaxed fraction is brought to a second and higher level (h2(h2 h1)) at the next stage (5,23) and is hel a second and lower pressure (p2 p1). The pressure difference DELTA p=p1 x p2 is lower than the hydrostatic pressure (phydr=p x g(h2+h1)) between the two levels, where g is the acceleration of the earth rotation. The relaxation is structured so that the developed gas bubbles reduce the density to give the pressure difference DELTA p to allow the fraction to pass to t next stage (5,23).

Abstract (de)

Das Verfahren und die Vorrichtung dienen zur Tieftemperaturzerlegung von Luft. Einsatzluft (1) wird in eine erste Rektifiziersäule (3) eingeleitet. Eine Überleitungsfraktion (6, 7) der Dichte p wird in flüssigem Zustand aus einem Reservoir (24, 16) innerhalb der ersten Rektifiziersäule (3) entnommen, entspannt (14, 14a, 18) und einem weiteren Verfahrensschritt (5, 23) zugeleitet. Der Flüssigkeitsspiegel in dem Reservoir (24, 16) steht dabei auf einem ersten Niveau h1 befindet und unter einem ersten Druck p1. Die entspannte Überleitungsfraktion wird dem weiteren Verfahrensschritt (5, 23) auf einem zweiten, höheren Niveau h2 (h2 > h1) und unter einem zweiten, niedrigeren Druck (p2 < p1) zugeführt. Die Differenz der beiden Drücke p = p1 - p2 ist kleiner als der durch eine Flüssigkeitssäule der Überleitungsfraktion zwischen dem ersten und dem zweiten Niveau erzeugten hydrostatischen Druck (phydr = · g · [h2-h1]): p = p1 - p2 < p · g · [h2 - h1](g: Erdbeschleunigung). Die Entspannung (14, 14a, 18) wird so durchgeführt, daß die beim Entspannen entstehenden Gasblasen die Dichte der Überleitungsfraktion soweit verringern, daß die Druckdifferenz p ausreicht, um die Überleitungsfraktion dem weiteren Verfahrensschritt (5, 23) zuzuführen. <IMAGE>

IPC 1-7 (main, further and additional classification)

F25J 3/02; F25J 3/04

IPC 8 full level (invention and additional information)

F25J 3/04 (2006.01)

CPC (invention and additional information)

F25J 3/04872 (2013.01); F25J 3/04412 (2013.01); F25J 3/04678 (2013.01); F25J 3/04703 (2013.01); F25J 3/04793 (2013.01); F25J 2235/06 (2013.01); F25J 2235/50 (2013.01); F25J 2235/58 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE ES FR GB IT

EPO simple patent family

EP 1052465 A1 20001115; EP 1052465 B1 20050511; DE 19921949 A1 20001116; ES 2242331 T3 20051101; JP 2000356463 A 20001226; KR 20010049347 A 20010615; US 6308533 B1 20011030

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