| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for separating air capable of supplying high pressure nitrogen gas and oxygen gas used, for example, for an IGCC facility with a low power cost by utilizing a cold energy of an LNG, and an air separating facility. SOLUTION: In the air separating facility comprising heat exchangers 11, 20 for utilizing liquefied natural gas as a cold energy source, and a low temperature fractionating apparatus 10 for separating the air by guiding preliminarily refined material air to externally supply product gas obtained by the apparatus 10, a recycling route for guiding a heating medium cooled and liquefied by the natural gas through the exchanger 20 to the exchanger 11 by a pump 21 and then again guiding the medium to the exchanger 20 is provided, the product gas is guided to the exchanger 11, cooled by the medium, then compressed by a compressor 12, and then warmed by a heater 13 to a supplying high pressure gas.
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