| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a device capable of performing a concurrent manufacturing of liquid nitrogen of super-high purity and liquid oxygen of super-high purity. SOLUTION: An inner side of a first refining tower 6 is divided into an upper refining section 12, an intermediate refining section 13 and a lower refining section 14. To the upper section of the upper refining section is connected a nitrogen condenser 8. A second refining tower 7 is provided with a re-boiler 24 at the lower part of the refining section 22. Liquid nitrogen of super-high purity is recovered from between the upper refining section 12 of the first refining tower 6 and the intermediate refining section 13. Liquid air not containing substance of high boiling point recovered from between the intermediate refining section 13 and the lower refining section 14 is reduced in its pressure by an expansion valve 32, thereafter the air is supplied to the upper section of the refining section 22 of the second refining tower 7, contacted in a counter-flow state with gas gasified by a reboiler 24 arranged at a lower part of the refining section so as to separate the substance of low boiling point and then liquid oxygen of super-high purity is recovered from the lower part of the refining section 22 of the second refining tower 7.</p> |
