CREATION OF AN OXYGEN AIR SEPARATION INSTALLATION OF LOW PRESSURE FOR OPERATION IN LIQUID OR GAS LIQUID MODES
DOI:
https://doi.org/10.18198/j.ind.gases.2013.0704Keywords:
Air separation unit, Liquid oxygen, Oxygen under pressure, Expander stage, Compressor stage, Expander-compressor unit, Expansion operation, Off-design mode, EfficiencyAbstract
The need in effective and reliable air separation installations (ASU) of low and medium productivity for liquid oxygen production increases. Such ASU are usually created on the basis of the cycles of medium and high pressure. A report on development of oxygen ASU of medium productivity which realizes the cycle of low pressure with circulation of an expander stream of air has been presented. The characteristics of ASU are analyzed at its operation in the mode of outputting only liquid oxygen or in gas liquid mode when gaseous oxygen under pressure and simultaneously liquid oxygen are produced. The optimal mode and constructive indicators of the expander compressor unit (ECU) which corresponded to maximum of its coefficient of efficiency were found. The ECU was developed for the mode of outputting only liquid oxygen. It has been shown that when ASU operates in gas liquid mode the ECU keeps high efficiency. The carried out research has shown that it is possible to create an economical ASU with reliable machines of dynamic action for producing 700 kg/h of liquid oxygen or 200 kg/h of liquid oxygen and 607 m3/h of oxygen under the pressure of 3 MPa.
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