METHOD AND EQUIPMENT FOR PREPARING GASEOUS OXYGEN AND/OR NITROGEN UNDER PRESSURE

摘要

PURPOSE: To obtain a process and installation for production of gaseous oxygen and/or gaseous nitrogen under pressure in which production of liquid can be reduced without increasing the specific energy in production thereof. CONSTITUTION: In a process for producing gaseous oxygen and/or gaseous nitrogen under pressure by vaporization of a liquid product (at 8) compressed through heat exchange of at least one liquid product (at 13) taken out from the bottom of the low pressure air rectifying column 11 in a double rectifying column 9 with air boosted or brought to a high pressure, all of the air to be distilled is brought to the high air pressure. Excess fraction of the air is expanded in two turbines in series 5, 6 to the pressure of a medium pressure column 10 and the air is partially reheated (in 22) between two turbines.