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    • 7. 发明公开
    • Air separation
    • 空气分离
    • EP0640802A1
    • 1995-03-01
    • EP94306002.0
    • 1994-08-15
    • THE BOC GROUP, INC.
    • Mostello, Robert A.
    • F25J3/04
    • F25J3/0486F25J3/0409F25J3/04303F25J3/04412F25J2200/94F25J2215/50F25J2215/56F25J2220/52F25J2245/50
    • A process and apparatus for producing a gaseous oxygen product at a delivery pressure containing a low concentration of heavy impurities in which compressed and purified air is cooled in a main heat exchanger 26 to near its dew point temperatures and then introduced into a double rectification column 28 comprising a high pressure column 30 and a low pressure column 32 in a heat transfer relationship with one another through a condenser-reboiler 40. A liquid oxygen fraction 45 separated in the low pressure column 32 and collects in the sump 42 of the column 32. Partial reboiling of the liquid in the sump 42 results in its concentration of heavy impurities being enhanced relative to the liquid phase flowing into the sump through a downcomer 44. A main product stream is withdrawn from the liquid phase before it reaches the sump and is pumped to a delivery pressure and then vaporized within the main heat exchanger 26. A purge stream of liquid oxygen from the sump is removed so that the impurity concentration level within the main liquid oxygen product stream does not reach its solubility limit.
    • 在含有低浓度重杂质的输送压力下生产气态氧产品的方法和设备,其中压缩和净化的空气在主热交换器26中被冷却至接近其露点温度,然后被引入双精馏塔28 包括通过冷凝器 - 再沸器40彼此传热关系的高压塔30和低压塔32.液氧部分45在低压塔32中分离并收集在塔32的贮槽42中。 液池42中的液体的部分再沸腾导致其重质杂质的浓度相对于通过降液管44流入池中的液相得到增强。主产物流在其到达池并被泵送之前从液相中排出 达到输送压力,然后在主热交换器26内汽化。去除来自贮槽的液氧的清除流,以便imp 主液氧产品流内的纯度浓度水平未达到其溶解度极限。