OIL FREE THREE-STAGE RECIPROCATING COMPRESSOR AND CO2 SYSTEM COMPRISING SUCH A COMPRESSOR

摘要

The disclosure relates to a three-stage reciprocating compressor (30) comprising pistons (1, 7) and suction and compression chambers (27, 28, 29) in which a medium is compressed for each separate stage, which stages are connected in series and where a first stage is fluidly connected to an inlet (24) for inlet of uncompressed or pre-compressed gas where the three-stage pistons (1, 7) move synchronously along a common axis in one connected unit such that the first and second stage suction and compression chambers (27, 28) share piston (1) as well as cylinder wall (2), and having separate cylinder heads (3, 4), a top headpiece (3) and a bottom headpiece (4) on each side of the piston (1), the third stage piston (7) extending from a center of the first and second stage common piston (1) and is passed through an opening in the cylinder head (3) of the first stage suction and compression chamber, in extension of which is placed a third stage cylinder tube (8) with a smaller diameter than a diameter of the cylinder (2) for stage one and two, each stage fluidly separated by one or more one way valves (20a - 20f), where the second stage suction and compression chamber (28) is formed between the cylinder wall (2) and a piston skirt (5) as well as between an underside of the piston (1) and the headpiece (4) placed in a bottom of the cylinder (2). The disclosure further relates to a system for a CO2 regeneration plant (31) comprising a foam trap (32), a low pressure water scrubber (33), a stepless three-stage compressor (30) comprising one or more intercoolers (22) and water separators (23), a regenerable dehydrator (35) or an adsorber and a condensing unit comprising a condenser (36), a reboiler (38) and a stripper (37), where the compressor (30) is a three-stage reciprocating compressor.