Patent ID: 9624936
Date: 2017-04-18
CPC Classifications: F02D,F04D,G01H

Claim:
1. A method of antisurge control for a turbocompressor instrumented with at least one vibration sensor, an antisurge controller, and an antisurge valve, the method comprising: (a) selecting a frequency band; (b) operatively receiving into the antisurge controller a first set of vibration data from the at least one vibration sensor when the turbocompressor is not in surge; (c) calculating, in the antisurge controller, a background vibration level based on the first set of vibration data in the frequency band; (d) operatively receiving a second set of vibration data into the antisurge controller from the at least one vibration sensor whether the turbocompressor is in surge or not; (e) calculating, in the antisurge controller, a current vibration level based on the second set of vibration data in the frequency band; (f) calculating, in the antisurge controller, a process variable as a function of the background vibration level and the current vibration level; (g) selecting a set point, R; (h) comparing the process variable to the set point, R in the antisurge controller; and (i) manipulating the antisurge valve based on a comparison of the process variable to the set point, R.