This air separation plant can be controled under lower pressure, and product highly pure oxygen and nitrogen at the same time.

1. Principle

Model KDON-550/1000air separation plant is a plant recovering oxygen and nitrogen from air in a simultaneous way. It is an upgrading low consumption product using full low pressure process and turbo expanders.

The dried saturated air entering the lower column becomes liquid air due to consecutive cooling. Purified oxygen and nitrogen will be obtained after distillation carried out by use of different boiling points between oxygen and nitrogen within the distillation column. The distillation process is a process employing partial evaporation and partial condensation many times. The function of the lower column is to obtain liquid air and liquid nitrogen. The function of the main condenser/reboiler is to evaporate liquid oxygen and condense gaseous nitrogen. As to the upper column, the function is to obtain product oxygen and product nitrogen

2. Major Technical Data

1,Model KDON-550/1000

2,Air to be processed 3680 Nm3/h(0°C,101.325kPa)

3,Production oxygen purity≥99.6% 200±5% m3/h

oxygen purity≤10ppm 200±5% m3/h

4,Air pressure: Starting pressure ≤0.7 MPa

Normal operating pressure0.6~0.7MPa

5,Pressure out of the column O2 0.03 MPa

N2 0.013 MPa

6,Power consumption for O2 ~0.75KW.h/ m3 O2

7,Cooling water consumption 30t/h

8,Temp difference at warm end of heat exchanger ~2°C

9,Working cycle ~12months

10,Starting period ~15hours

( The starting of the expander is regarded as the criterion.)

Lower pressure Air separation plant