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    • 26. 发明申请
    • METHOD AND APPARATUS FOR PRODUCING LIQUID NITROGEN
    • 生产液氮的方法和装置
    • WO1997016687A1
    • 1997-05-09
    • PCT/CA1996000704
    • 1996-10-24
    • GARDNER, Thomas, W.
    • F25J01/00
    • F25J1/0015C01B23/0094C01B2210/001C01B2210/0014F25J1/0037F25J1/004F25J1/0045F25J1/0202F25J1/0247F25J1/0288F25J1/0294F25J2205/40F25J2205/60F25J2205/80F25J2210/40F25J2230/30F25J2230/40F25J2230/42F25J2270/06
    • A method and apparatus for producing liquid nitrogen from air comprising a gaseous mixture of about 78 % by volume of nitrogen, about 21 % by volume of oxygen, less than 1.0 % by volume of argon, and small amounts of carbon dioxide, water vapour, and other trace elements and compounds comprise an extractor that extracts portions of the oxygen, carbon dioxide, and water vapour so as to produce a nitrogen-rich gaseous mixture comprising about 90 % to about 99 % by volume of nitrogen, about 10 % to about 1 % by volume of oxygen, and no more than trace amounts of carbon dioxide, water vapour, and other elements and compounds. A nitrogen recycle compressor compresses the nitrogen-rich gaseous mixture to a specified pressure. A gas expander expands and thereby cools the compressed nitrogen-rich gaseous mixture to a lower specified pressure which is slightly above atmospheric pressure, thereby cooling the nitrogen-rich gaseous mixture, which is fed into a heat exchanger, which cools a higher pressure nitrogen-rich gaseous mixture flowing in a separate pass of the heat exchanger, until at least a portion of the higher pressure nitrogen-rich gaseous mixture condenses to liquid state. A liquid/gas separator separates the liquid nitrogen from the nitrogen-rich gaseous mixture, which liquid nitrogen is extracted from the apparatus, through an outlet, for subsequent storage or use.
    • 一种用于从空气中产生液氮的方法和装置,包括约78体积%的氮气,约21体积%的氧气,小于1.0体积%的氩气和少量二氧化碳,水蒸汽, 和其它微量元素和化合物包括提取器,其提取部分氧气,二氧化碳和水蒸汽,以便产生富含氮的气体混合物,其包含约90%至约99体积%的氮气,约10%至约 1体积%的氧,不超过痕量的二氧化碳,水蒸汽等元素和化合物。 氮气再循环压缩机将富氮气体混合物压缩至特定压力。 气体膨胀器膨胀,从而将压缩的富氮气体混合物冷却至略高于大气压的较低规定压力,从而冷却富氮气态混合物,该混合物进料到热交换器中, 富集的气体混合物在热交换器的单独通道中流动,直到至少一部分较高压力的富氮气态混合物冷凝至液态。 液体/气体分离器将液氮从富氮气体混合物中分离,氮气从设备中提取出来,通过出口进行存储或使用。