DEVELOPMENT OF A DUAL MODE ASU OF MEDIUM PRESSURE WITH THE AIR FLOW CIRCULATION THROUGH THE EXPANDER-COMPRESSOR UNITS
DOI:
https://doi.org/10.18198/j.ind.gases.2014.0712Keywords:
Air separation unit (ASU), Liquid oxygen, Compressed oxygen, Gas-liquid operation mode, Expander-compressor unit (ECU)Abstract
In the modern air separation installations (ASU) which realise the cycles of medium pressure with the circulation of the air flow to use efficiently the operation of its expansion in the expander is not possible. The studies has shown that the operation of expansion of a part of the processed air can be transformed into the additional refrigerating capacity in the expander compressor unit (ECU) of a special design. The characteristics of the ASU are analyzed at its operation in the mode of outputting liquid oxygen or in gas liquid mode when gaseous oxygen under pressure is additionally produced. The optimal mode and constructive characteristics of the ECU which fitted with maximum of its coefficient of efficiency were found. The ECU was developed for the mode of outputting only liquid oxygen. In the course of simultaneous production of compressed and liquid oxygen the ECU operates in a off-design mode. The carried out research has shown that the developed ECU provides also an economical operation of the ASU in a gas liquid mode. It confirms the possibility of creation of a reliable and quite efficient dual mode ASU only with machinery of a dynamic principle of action.
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