Patent ID: 8840358
Filing Date: 2014-09-23
Classification: F04D,Y02B

Abstract:
1. A method of controlling a compressor comprising: (a) providing a compressor feed stream; (b) passing the compressor feed stream to an inlet of the compressor to provide a compressed stream at an outlet of the compressor; (c) calculating one or more controlled variables (CO (d) providing one or more set points, that are invariant to the compressor inlet conditions of the compressor feed stream, said inlet conditions comprising at least the ratio of the specific heats (Cp/Cv) of the compressor feed stream, said one or more set points comprising an anti-surge set point (SP (e) providing a compressor recycle line around the compressor from the compressed stream to upstream of the inlet of the compressor, said compressor recycle line comprising an in-line recycle valve; (f) controlling at least one of the in-line recycle valve and the speed of the compressor in response to the difference between the surge controlled variable (CO