| 摘要 |
The plant, comprising a high-pressure column (101), an intermediate pressure column (102) with a boiler (24), and a low pressure column (103), has no means for argon enrichment of a fluid containing between 3 and 20 per cent/mol of argon other than the three aforementioned columns. During operation a mixture of at least oxygen, nitrogen and argon is fed into the high-pressure column, where it is separated into oxygen-rich and nitrogen-rich fractions. Part of both fractions is fed to the low-pressure column, which operates at preferably above 4 bars, and the gas from the lower part of this column is sent to the boiler in the intermediate column and at least partially condensed before being returned to the low-pressure column. Oxygen-rich and nitrogen-rich fluids (31, 72) are then drawn from the low-pressure column; at least part of the nitrogen-rich fluid is at least partly condensed in a vaporizer/condenser linked to the low-pressure column, and at least part of the partly condensed fluid is fed back to the high-pressure column, but no fluid containing 3-20 per cent/mol of argon is enriched with argon in any column apart from the high-pressure, low-pressure or intermediate-pressure columns. An Independent claim is also included for the instillation for the cryogenic air separating procedure. |
