| 摘要 |
PROBLEM TO BE SOLVED: To produce a method and a device for low-separation of air to produce a product, such as high purity oxygen, nitrogen, and argon by a device at an operation cost, through low energy consumption and with a high yield. SOLUTION: A first partial flow of compression clean air is cooled and introduced to a main rectifying device and separated into liquid oxygen and gaseous nitrogen. A produced liquid fraction is vaporized through indirect heat exchange with a second split stream of compression clean air, and at least a part of a second split stream condensed in the gasification case is used as a refrigerant for a head part condenser 27 of a crude argon tower 24 connected to the main rectifying device. A condensed second split stream covers substantially the whole of a refrigerant necessary to liquefaction of crude argon by the condenser 27. At least a part of a second partial flow vaporized through indirect heat exchange at the head condenser 27 of the coarse argon tower is introduced to the main rectifying device 4 without being further boosted. |
