| 摘要 |
PROBLEM TO BE SOLVED: To increase the manufacture of liquid by separating gas from air at low temperature, in a system where the supply pressure of a first turbo expander is under the supply pressure of a second turbo expander. SOLUTION: An air current is divided into two parts 19 and 21. The part 21 is sent to a heat exchanger 8, and is sent to a middle-pressure column 11. The part 19 is compressed into middle pressure with a compressor 5, is further compressed into high pressure with a compressor 6, and is divided into two fractions 23 and 25. The division 23 is divided into two so as to be sent to two columns 11 and 36. The second high-pressure air fraction 25 is cooled to a temperature larger than the inlet temperature of the first expander 9. Next, in the second turbo expander 7, it is expanded to the middle pressure, is sent to an exchanger 8, and is heated directly. Then, liquid nitrogen and the liquid oxygen flows 41 and 45 are drawn out of the columns 11 and 13, and a part of the liquid nitrogen is pumped, and is gasified in the exchanger 8.
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