MULTISTAGE CENTRIFUGAL COMPRESSOR WITH AN ANTI-SURGE SYSTEM AND CONTROL METHOD THEREFOR

摘要

An anti-surge system for a centrifugal compressor, the centrifugal compressor including first to Nth compression stages (C1, C2, C3, C4), and an intermediate gas extraction pipeline (IA/PA) being disposed between an (M-1)th compression stage and an Mth compression stage, wherein N is an integer ≥ 2, and M is an integer ≤ N, comprises: a first throttle device (Fa); a first pressure sensor (Pa); a first temperature sensor (Ta; a second pressure sensor (Pb); a second throttle device (Fb); a second temperature sensor (Tb); a third pressure sensor (Pc); a branch pipeline (Bp); an anti-surge backflow valve (ASV); and a control system, comprising a first anti-surge controller (ASC1), a second anti-surge controller (ASC2) and a selector (HY).