EP 1994344 A1 20081126 - METHOD AND APPARATUS FOR FRACTIONATING AIR AT LOW TEMPERATURES
Title (en)
METHOD AND APPARATUS FOR FRACTIONATING AIR AT LOW TEMPERATURES
Title (de)
VEFAHREN UND VORRICHTUNG ZUR TIEFTEMPERATURZERLEGUNG VON LUFT
Title (fr)
PROCÉDÉ ET DISPOSITIF DE DÉCOMPOSITION DE L'AIR À BASSE TEMPÉRATURE
Publication
Application
Priority
- EP 2007001917 W 20070306
- DE 102006012241 A 20060315
Abstract (en)
[origin: WO2007104449A1] Disclosed are a method and an apparatus for fractionating air at low temperatures by means of a nitrogen-oxygen separating distillation column system which comprises at least one fractionating column 21, 22). A main air flow (1, 5) is condensed in an air condenser (2) and is purified in a purifying device (4). A first and a second air flow (7, 8) are diverted from the main air flow (5). The first air flow (7) is re-condensed in two serially connected re-condensers (10, 13). The re-condensed first air flow (15) is cooled and liquefied or pseudo-liquefied at least in part by indirectly exchanging heat (16) and is then introduced into the nitrogen-oxygen separating distillation column system (20). The second air flow (8) is cooled by indirectly exchanging heat (16), is divided into two partial flows (24, 27), and is then expanded in a power-generating manner in two expanders (25, 28) which are provided with substantially the same inlet pressure. At least some of the partial flows (26, 29) of the second air flow, which have been expanded in a power-generating manner, is introduced into the nitrogen-oxygen separating distillation column system (20) (30, 129). At least some of the mechanical power generated during the power-generating expansion (25, 28) of the second air flow is used for driving the two serially connected re-condensers (10, 13). A liquid product flow (31) is removed from the nitrogen-oxygen separating distillation column system (20), is pressurized (32) in the liquid state, is evaporated or pseudo-evaporated in said pressurized state by indirectly exchanging heat (16) with the first air flow (15), and is finally withdrawn as a gaseous product flow (34). Both re-condensers (10, 13) are operated at an input temperature exceeding 250 K, especially exceeding 270 K.
IPC 8 full level
F25J 3/04 (2006.01)
CPC (source: EP US)
F25J 3/04054 (2013.01 - EP US); F25J 3/0409 (2013.01 - EP US); F25J 3/04175 (2013.01 - EP US); F25J 3/04193 (2013.01 - EP US); F25J 3/04296 (2013.01 - EP US); F25J 3/04303 (2013.01 - EP US); F25J 3/04393 (2013.01 - EP US); F25J 3/04412 (2013.01 - EP US); F25J 3/04454 (2013.01 - EP US); F25J 2240/04 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
DE 102006012241 A1 20070920; CN 101421575 A 20090429; CN 101421575 B 20121107; EP 1994344 A1 20081126; JP 2009529648 A 20090820; US 2009188280 A1 20090730; WO 2007104449 A1 20070920
DOCDB simple family (application)
DE 102006012241 A 20060315; CN 200780013596 A 20070306; EP 07723062 A 20070306; EP 2007001917 W 20070306; JP 2008558680 A 20070306; US 28260607 A 20070306