| 摘要 |
<p>Method of using an external cold source (9) in an air separation apparatus (1) in which air is liquefied and rectified to manufacture products of oxygen, nitrogen and the like mainly in the form of liquid, characterized in that an inert gas (2) guided out of the air separation apparatus (1) is cooled by indirectly heat exchanging it (in 3) with a cooled, liquefied, recycling, pressure-raised inert gas (11), said inert gas guided out of the apparatus is joined with a low temperature inert gas (16) guided out also of said apparatus, the joined inert gas is compressed at low temperature by heat exchange (in 8) with the external cold source (9) up to a pressure required for liquefaction, said liquefied inert gas (11) is supplied as a cold source to a recycle heat exchanger (3), the low temperature inert gas evaporated in said heat exchanger is joined with a part of the low temperature inert gas compressed by compressor (5), the low temperature inert gas thus joined is again liquefied by heat exchange (in 8) with the external cold source (9), said liquefied inert gas (17) is introduced into the air separation apparatus to which the cold necessary therefore is supplied, and thereafter said liquefied inert gas is again recycled as inert gas out of the air separation apparatus.</p> |
