摘要:
The process and the apparatus serve for producing pressurized gaseous nitrogen by cryogenic separation of air in a distillation column system comprising a high pressure column (4), a medium pressure column (5), a main condenser (6) and a medium pressure column top condenser (7) both in the form of condenser-evaporators. A compressed and purified feed air stream (1) is introduced into under a first pressure and cooled in the main heat exchanger (2). At least a portion (3) of the air (1) cooled in a main heat exchanger (2) is introduced into the distillation column system. A first gaseous nitrogen stream (8) from the top the high pressure column (4) is condensed in the main condenser (6). Bottom liquid (16, 19, 21, 25) of the medium pressure column (5) is evaporated and gaseous nitrogen (30) from the top the medium pressure column (5) is condensed in the medium pressure column top condenser (7). Liquid nitrogen (53) from the medium pressure column (5) is pressurized (33) to a pressure which is at least equal to the high pressure column pressure and at least partially (36) introduced into the high pressure column (4). A second gaseous nitrogen stream (40) from the top the high pressure column (4) is recovered as pressurized gaseous nitrogen product. A portion (turbine stream 43) of the compressed and purified feed air stream (1) is workexpanded in an expansion machine (42) from the first pressure to a second pressure and afterwards is warmed in the main heat exchanger (2).
摘要:
A method and apparatus to produce oxygen and nitrogen co-products in which a compressed a compressed and purified air stream is cooled, fully or partially condensed and then rectified in a main distillation column to form a nitrogen-rich vapor column overhead and crude liquid oxygen. A crude liquid oxygen stream is depressurized and then stripped in an auxiliary distillation column with a stripping gas to produce an oxygen-rich liquid. The nitrogen-rich vapor column overhead from the main distillation column is used to form a nitrogen product and the crude liquid oxygen is partially vaporized to produce the stripping gas, a residual oxygen- rich liquid and liquid nitrogen reflux to the main distillation column. The oxygen product is formed from the residual oxygen-rich liquid by either providing the heat exchange duty in condensing the compressed and purified air stream or by condensing nitrogen-rich vapor used in refluxing the main distillation column.
摘要:
Das Verfahren und die Vorrichtung dienen zur Erzeugung eines gasförmigen Sauerstoff-Druckprodukts durch Tieftemperaturzerlegung von Luft in einem Destilliersäulen-System (50, 51). Die gesamte Einsatzluft (1) wird in einem Hauptluftverdichter (3) auf einen ersten Druck (p1) verdichtet. Mindestens ein Teil der verdichteten Einsatzluft (6, 8) wird in einem Hauptwärmetauscher-System (40) in indirektem Wärmeaustausch gegen mindestens einen Rückstrom (64, 71, 79, 81) aus dem Destilliersäulen-System (50, 51) abgekühlt und in das Destilliersäulen-System (50, 51) eingeleitet. Ein erster Luftstrom (9, 10) und ein zweiter Luftstrom (20, 21) werden aus der verdichteten Einsatzluft (6, 8) abgezweigt. Der erste Luftstrom (9) wird unter dem ersten Druck (p1) dem Hauptwärmetauscher-System (40) zugeführt und dort auf eine erste Zwischentemperatur (T1) abgekühlt. Der abgekühlte erste Luftstrom (10) wird arbeitsleistend entspannt (11, 12; 211). Mindestens ein Teil des arbeitsleistend entspannten ersten Luftstroms (13) wird in das Destilliersäulen-System (50, 51) eingeleitet. Der zweite Luftstrom (20) wird unter dem ersten Druck (p1) dem Hauptwärmetauscher-System (11) zugeführt und dort auf eine zweite Zwischentemperatur (T2) abgekühlt und anschließend in einem Nachverdichtungssystem, das mindestens zwei Stufen (22, 24) aufweist, von dem ersten Druck (p1) auf einen zweiten Druck (p2) nachverdichtet, der höher als der erste Druck (p1) ist. Der nachverdichtete zweite Luftstrom (26) wird unter dem zweiten Druck (p2) dem warmen Ende des Hauptwärmetauscher-Systems (40) zugeführt, im Hauptwärmetauscher-System (40) abgekühlt und verflüssigt oder pseudo-verflüssigt und anschließend in das Destilliersäulen-System eingeleitet (28, 29). Ein flüssiger Sauerstoff-Produktstrom (69) wird aus dem Destilliersäulen-System (51) entnommen, in flüssigem Zustand auf einen erhöhten Druck gebracht (70), unter diesem erhöhten Druck im Hauptwärmetauscher-System (40) verdampft oder pseudo-verdampft, auf etwa Umgebungstemperatur angewärmt und schließlich als gasförmiger Sauerstoff-Druckproduktstrom (72) abgezogen. Das Nachverdichtungssystem ist adiabat ausgebildet.
摘要:
Dans un procédé de production d'azote par distillation cryogénique, de l'air contenant du monoxyde de carbone est envoyé à une colonne de distillation cryogénique (5), un débit D d'azote est soutiré en tête de la colonne de distillation, avec une teneur en CO inférieure à une valeur fixée S1, et un débit de liquide cryogénique riche en azote provenant d'une source extérieure (7) est envoyé en tête de la colonne, le débit de liquide cryogénique envoyé à la colonne étant inférieur à une valeur V si la teneur en CO dans l'air ne dépasse pas un seuil préalablement défini (SO) et le débit de liquide cryogénique envoyé à la colonne étant supérieur à une valeur V si la teneur en monoxyde de carbone de l'air dépasse ce seuil préalablement défini (SO).
摘要:
A low temperature air separation process for producing pressurized gaseous product in an air separation unit using a system of distillation columns comprises cooling a compressed air stream to a heat exchange line (30) to form a compressed cooled air stream (3), sending at least part of the compressed, cooled air stream to a column (10) of the system, liquefying a process stream to form a first liquid product, storing at least part of the first liquid product in a storage tank (50), sending at least part (60) of the above first liquid product from the storage tank to the air separation unit as one of the feeds, extracting at least one second liquid product stream (6) from a column (11) of the column system and pressurizing the at least one second liquid product stream, vaporizing the above pressurized second liquid product stream to form pressurized gaseous product in the heat exchange line and extracting a cold gas (40) without warming it completely in the heat exchange line.
摘要:
A low temperature air separation process for producing pressurized gaseous product in an air separation unit using a system of distillation columns comprises cooling a compressed air stream to a heat exchange line (30) to form a compressed cooled air stream (3), sending at least part of the compressed, cooled air stream to a column (10) of the system, liquefying a process stream to form a first liquid product, storing at least part of the first liquid product in a storage tank (50), sending at least part (60) of the above first liquid product from the storage tank to the air separation unit as one of the feeds, extracting at least one second liquid product stream (6) from a column (11) of the column system and pressurizing the at least one second liquid product stream, vaporizing the above pressurized second liquid product stream to form pressurized gaseous product in the heat exchange line and extracting a cold gas (40) without warming it completely in the heat exchange line.
摘要:
An air separator oxygen gas capable of producing oxygen gas in an energy-saving manner, thereby remarkable downsizing can be realized. The air separator includes an air compressor (1) for taking in air from the outside and compressing it, first adsorption towers (2,3) for concentrating oxygen gas that is contained in the air compressed by the air compressor (1), an oxygen/air compressor (11) for further compressing oxygen-rich compressed air (X) passed through the first adsorption towers (2,3), a main heat exchanger (21) for cooling oxygen-rich compressed air (Y) passed through the oxygen/air compressor (11), and a high-pressure rectification tower (23) and a low-pressure rectification tower (28) for taking out oxygen gas by separating the oxygen-rich compressed air (Y) passed through the main heat exchanger (21) so as to be cooled to a low temperature by utilizing differences in boiling points of elemental gases.
摘要:
In an integrated power generation system, part of the air from a gas turbine compressor (1) is separated in a single nitrogen wash column (15) to remove oxygen and the gaseous nitrogen (21, 42)produced at the top of the column is sent back to a point upstream of the expander (5) of the gas turbine. The wash column may be fed with liquid nitrogen (17) from an independent air separation unit (A) in which air is separated by cryogenic distillation. Liquid (37) from the bottom of the wash column may be fed back to the air separation unit (A