Fractional column is the general name for the whole set of equipment consisting of cold box, main heat exchanger, evaporator-condenser, sub-cooler, rectification column, turbine, cryogenic valves, pipes and meter tubes. Cooling, liquefaction and separation of process air, expansion and warm-up of oxygen-rich air and warm-up of product gas are all carried out inside the fractionation column.
The rectification column is made of aluminum, and is the highest equipment inside the cold box. It is the class I pressure vessel. The rectification column is installed with packing. Air separation of is achieved in the rectification column. Through all kinds of I/O nozzles, the rectification column is connected with heat exchanger, vaporizer-condenser etc unit efficiently, to realize the liquefaction, separation of air, sub-cooling of liquid air and gas warm-up. Through the control valve on the pipeline, the direction and the distribution of gas is controlled and regulated.