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A process for the low-temperature separation of air and air separation plant
A process for the low-temperature separation of air and air separation plant
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机译：空分装置和空分装置的低温分离方法
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摘要
It is a process for the low-temperature separation of air with the use of an air separation plant (100) with a distillation columns system (9, 12), the one on a first pressure level operated first high-pressure column (10) and a on a second pressure level operated second high-pressure column (11) as well as a on a third pressure level operated low-pressure column (9) and a on a fourth pressure level operated mixing column (7) has a. The first pressure level is at least 0,5 bar above the second pressure level, the third pressure level at least 2 bar below the second pressure level and the fourth pressure level differs by not more than 0,5 bar of the second or from the first pressure level. In the first high-pressure column (10) and in the second high-pressure column (11) are in each case gaseous compressed air flows (e, f), and this is fed in each case, liquid, oxygen-enriched bottom products and gaseous, nitrogen-enriched formed head product. From the low-pressure column (9), a liquid, an oxygen-rich current (o) is drawn off and, in the mixing column (7) the flow of compressed air fed in gaseous form (g) is sent, as a result of which is in the mixing column (7) a liquid bottom product and a gaseous top product form. The top product of the second high-pressure column (10), at least partially as a nitrogen-enriched stream (h) drawn off, with the use of the bottom product of the mixing column is cooled, and then into the second high-pressure column (10) is fed back to. For the cooling of the nitrogen enriched (h) with the use of the bottom product of the mixing column is a falling-film condenser (13) is used, the geodetically above the mixing column (12) is arranged, and the evaporation chamber is operated on the third pressure level. A corresponding air separation unit (100) is likewise subject matter of the present invention.
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