| 摘要 |
<p>Apparatus for producing nitrogen and oxygen gases of super-high purity by subjecting air to supercooling, liquefaction and separation. It is an object of this invention to obtain an apparatus for producing high-purity nitrogen and oxygen gases, which does not require an expensive expansion turbine which frequently malfunctions. In this apparatus, a liquid nitrogen storage means (14) is connected to a fractionating tower (12), and the supercooled compressed air introduced from an air-compressing means (1) into the fractionating tower (12) is further cooled through the heat loss of evaporating liquid nitrogen to recover the nitrogen in the gas phase and leave the oxygen in the liquid phase by utilizing the difference in the boiling points thereof. The resultant oxygen is condensed in an oxygen condenser (15). This condensed oxygen is further condensed in an oxygen fractionating tower (21) which is connected to the liquid oxygen storage means (23). The oxygen thus condensed is mixed with liquid oxygen from the liquid oxygen storage means (23), and the resultant mixture is gasified to obtain the finished product, oxygen gas. The nitrogen gas obtained from the fractionating tower is mixed with the liquid nitrogen from the liquid nitrogen storage means (14) to obtain a finished product, nitrogen gas.</p> |
