| 摘要 |
Process and apparatus for producing a pressurized gaseous oxygen product by cryogenic air separation The process and the apparatus serve for producing a pressurized gaseous oxygen product by cryogenic air separation in a distillation column system which has at least one separating column. Feed air is compressed in an air compressor. A first partial stream (2, 4, 6, 7) of the compressed feed air is expanded (5, 8) while performing work. A second partial stream (3) of the compressed feed air (1) is cooled and liquefied or pseudo-liquefied and subsequently introduced into the distillation column system. A liquid oxygen product stream (51) is removed from the distillation column system, brought to a first increased pressure in the liquid state (52), vaporized or pseudo-vaporized under this first increased pressure by indirect heat exchange (10) with the second partial stream (3) of the compressed feed air, warmed to approximately ambient temperature (10) and finally drawn off as a gaseous product stream (55). The vaporized or pseudo-vaporized oxygen product stream (53) is brought further to a second increased pressure, which is higher than the first increased pressure, in a cold compressor (13). The product stream (54) is warmed to approximately ambient temperature under this second increased pressure (10). At least part of the mechanical energy produced in the work-performing expansion (5, 8) of the first partial stream (3) is used for driving the cold compressor (13). |
