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    • 9. 发明公开
    • Air separation method and apparatus
    • 空气分离方法和设备
    • EP0855565A2
    • 1998-07-29
    • EP98300425.0
    • 1998-01-21
    • THE BOC GROUP, INC.
    • Mehta, AnishStern, Sidney Simon
    • F25J3/04
    • F25J3/044F25J3/04309F25J2200/72F25J2215/40F25J2240/48Y10S62/908
    • A stream of air is compressed (in a compressor 14) and is purified in a unit 18. The compressed purified air is cooled in a heat exchanger 22 to a temperature suitable for its rectification and is separated in a rectification column 24 into an oxygen-enriched liquid bottom fraction and a nitrogen top fraction. A stream of oxygen-enriched liquid is withdrawn from the column 28, is expanded through a valve 48 and is indirectly heat exchanged in a condenser 30 with a first stream 32 of the nitrogen fraction so as to condense the latter. A resulting stream 54 of vaporized oxygen-enriched air is warmed in the main heat exchanger and a part of it may be used to regenerate the purification unit 18. The nitrogen condensate is used as reflux in the column 24. A second stream 36 of nitrogen is expanded in a turbine 50, is warmed in the heat exchanger 22, and is taken as a product at above atmospheric pressure.
    • 空气流被压缩(在压缩机14中)并在单元18中净化。压缩的净化空气在热交换器22中被冷却至适合其精馏的温度,并在精馏塔24中被分离成含氧气体, 富氮液体底部馏分和氮顶部馏分。 富氧液体流从塔28排出,通过阀48膨胀,并在冷凝器30中与氮气馏分的第一物流32间接进行热交换,以冷凝后者。 蒸发的富氧空气的所得物流54在主热交换器中加热,并且其一部分可用于再生净化单元18.氮冷凝物在塔24中用作回流。氮的第二物流36 在涡轮机50中膨胀,在热交换器22中被加热,并在高于大气压下被作为产品。