Patent ID: 6652241
Filing Date: 2003-11-25
Classification: F04B

Abstract:
A process comprising compressing a gas stream of entry temperature t1 with the help of hydraulically driven piston compressors in two compression stages from an entry pressure p1 to an intermediate pressure p2 after the first compression stage and from intermediate pressure p2 to an exit pressure p3 after the second compression stage, and the gas stream compressed to intermediate pressure p2 is cooled to entry temperature t1 before entry into the second compression stage and identical pressure ratios p3/p2=p2/p1 are used in the compression stages, characterized in that the pressure ratios are adjusted accordingly by matching a hydraulic fluid stream for driving the first compression stage and a hydraulic fluid stream for driving the second stage with respect to their flow rate, with the help of two adjustable hydraulic fluid pumps.