| 摘要 |
PURPOSE:To eliminate an expansion turbine or the like while obtaining a high purity oxygen gas by a method wherein air is compressed to remove carbon dioxide and water and cooled down to a super low temperature to be separated into nitrogen and oxygen utilizing a boiling point difference therebetween, which are stored into liquid nitrogen storage tanks separately to be distilled while being utilized for a cold source. CONSTITUTION:Air compressed with a compressor 1 is cooled with a waste heat recovery device 2 and an intercooler 3, compressed again with a compressor 4 and then, cooled with an after cooler 5. Then, the air is passed through a closed type cooling cylinder 6a and an adsorption cylinder 7 to remove water and CO2. Then, a part of the air is sent to a heat exchanger 8 and the rest thereof to a heat exchanger 10 to be cooled down to a super low temperature. Both the air is combined to be sent to a fractioning column 12 and brought into contact with the compressed air fed to cool. At this point, O2 in the compressed air is liquefied utilizing a boiling point difference between the O2 and N2 to be separated from the N2. Liquid air 13 containing a plenty of the O2 is taken out of the bottom part of the fractioning column 12 to be sent to an oxygen fractioning column 21 through an oxygen condensing column 15. The gas N2 is sent to the heat exchanger 8 with a pipe 19 to be heated and then, taken out as high purity N2 from main pipe 20. |
