| 摘要 |
PURPOSE: To secure a favorable yield, by introducing and storing at least part of an oxygen-rich liquid component to and in a liquid air tank when the oxygen demand is large and again taking out the stored liquid component when the oxygen demand is small. CONSTITUTION: When the quantity of oxygen taken out of a conduit increases, an increased flow rate is set to an air compressor 1 and the flow rate introduced to a low-pressure stage 11 through an expansion turbine 7 is fixed. Therefore, the quantity of sucked air is introduced to a high-pressure stage 10 and increases the exchanging quantity of a fractionating tower. A liquid which increases correspondingly to the exchanging quantity is taken out through conduits 14 and 12 and an excessive liquid is stored in a nitrogen tank 35 and a liquid air tank 40. The increased liquid increases the introduction of the heat from a condenser/evaporator 48 and evaporated oxygen is discharged front a conduit 16. The liquid oxygen corresponding to the evaporated oxygen is taken out of an oxygen tank 32. When a small quantity of oxygen is produced, the quantity of air introduced to the high-pressure stage 10 is reduced and the liquids in the nitrogen tank 35 and liquid air tank 40 are introduced to the low-pressure stage 11 and further introduced to the oxygen tank 32.
|
