| 摘要 |
<p>In an air separation plant comprising heat exchangers (11, 20) utilizing liquefied natural gas as a cold source and a cryogenic rectifying unit (10) for separating air, a product gas obtained in said cryogenic rectifying unit (10) is supplied and a closed cycle is provided, in which a heat medium which has been cooled down and liquefied in the first heat exchanger (20) by said liquefied natural gas is led to the second heat exchanger (11) by a pump (21) so as to be evaporated, the evaporated heat medium is then introduced into said first heat exchanger (20) again, said product gas is led to said second heat exchanger (11) so as to be cooled down by said heat medium and then compressed by a compressor (12) and the cooled and compressed product gas is then warmed by a heater (13). <IMAGE></p> |
