THE OPTIMIZATION OF THE MULTI-SHAFT EXPANDER-COMPRESSOR UNIT OF THE AIR SEPARATION UNIT OF MEDIUM CAPACITY
DOI:
https://doi.org/10.18198/j.ind.gases.2013.0693Keywords:
Air separation init, Liquid oxygen, Multi-shaft expander-compressor unit, Compressor stage, Expander stage, Expansion operation, Specific energy expenditureAbstract
In the modern air separation unit (ASU) that realize medium pressure cycles it is not possible to use effectively the air expansion operation in the expander. Studies have shown that expansion operation of a part of the processed air can be usefully transformed in additional refrigerating capacity in the expander-compressor unit (ECU) of a special design. ECU is characterized, firstly, by the availability of a turbo reducer for providing the optimum rotation frequency of the shaft of the compressor stage (CS), and, secondly, of two expander stages in which the air expansion is occurred. In CS of the unit of the multi-shaft construction with operation of two expander stages the air flow arriving after that in the expander stage of low pressure is compressed. In the course of ECU mode and design optimization the conditions under which two expander stages can be placed on one shaft were found. Optimization calculations of ASU together with ECU have shown that specific expenditure of energy in this unit can be reduced from 1.1 to 0.89 kWh/kg of liquid oxygen.
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