Turbocompressor antisurge control by vibration monitoring

摘要

The proposed mechanical method of turbocompressor surge detection uses vibration signals from vibration monitoring equipment mounted on the compressor components to detect a surge event and provide antisurge control thereby. This method utilizes only mechanical information to identify surge, as compared to present day antisurge controllers that use compressor thermodynamic information such as flow, pressure, and temperature to locate a compressor's operating point on a compressor map compared to a surge region.

主权项

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.