FIELD: engines and pumps.
SUBSTANCE: improved multi-stage compressor (1) for gas compression consists of two compressor stages (2-5-28) in-series located one after the other, one of which (5-28) is driven by means of engine (9). One compressor stage (2) of the above ones has an individual drive not having mechanical link to the above engine (9), performed by means of expansion machine (18) included in closed power cycle (12) with the medium circulating inside and heated with compressed gas. Compressor stage (5-28) which is driven with engine (9) is the screw-type stage, and compressor stage (2) which is driven separately by means of expansion machine (18) from closed power cycle (12) is the stage of centrifugal type.
EFFECT: higher efficiency.
25 cl, 3 dwg
