Feed-gas molecular weight affects centrifugal compressor efficiency

A study has shown how relative density (molecular weight) affects the performance and efficiency of two centrifugal compressors.Scenarios simulated included: Compressor speed as a function of molecular weight, while maintaining the same suction and discharge pressure and mass flow rate. Polytropic head and efficiencies as a function of gas molecular weight for a given compression ratio, and compressor speed. Effects of thermodynamic properties.CompressorsCompressors generally fit into two categories: Positive displacement compressors that include reciprocating, rotary screw, sliding vane, liquid ring, and rotary lobe. The compression principle is volumetric displacement, in which reducing...

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