METHOD AND DEVICE FOR CONTROLLING A HOT RESTART OF A CENTRIFUGAL COMPRESSOR

摘要

Methods, devices and systems capable of performing a hot restart of a compressor driven by a turbine are provided. The turbine has a high speed shaft and a low speed shaft connected to the compressor. A base slow roll speed at which a speed of the low speed shaft is in a slow roll range is maintained at the high speed shaft for a predetermined time. Then, when a vibration amplitude of the compressor is larger than a vibration limit, the maintaining is repeated. Otherwise, a set speed of the high speed shaft is increased, until a current speed of the low speed shaft reaches a minimum operating speed. If, while increasing the set speed, the vibration amplitude becomes larger than the vibration limit, the maintaining is repeated.

主权项

1. A method for controlling a hot restart of a compressor, the method comprising:
(a) maintaining for a predetermined time a base speed of the high speed shaft at which a speed of the low speed shaft is in a slow roll range; (b) comparing a vibration amplitude of vibrations of the compressor with a vibration limit and, when the vibration amplitude is larger than the vibration limit, repeat the maintaining of step (a); and (c) when the vibration amplitude is lower than the vibration limit, increasing a set speed of the high speed shaft until a current speed of the low speed shaft exceeds a minimum operating speed, wherein when the amplitude of vibrations becomes larger than the vibration limit during the increasing of step (c), the maintaining step (a) is repeated; wherein the compressor is driven by a turbine having a high speed shaft and a low speed shaft which is connected to the compressor.