"Method And Device For Controlling A Hot Restart Of A Centrifugal Compressor"

Abstract: Methods (200, 555), devices (160, 400) and systems (100) capable of performing a hot restart of a compressor (120) driven by a turbine (110) are provided. The turbine (110) has a high speed shaft (130) and a low speed shaft (140) connected to the compressor (120). A base slow roll speed at which a speed of the low speed shaft is in a slow roll range is maintained (S610) at the high speed shaft for a predetermined time. Then, when a vibration amplitude of the compressor (120) is larger than a vibration limit (S620), the maintaining is repeated. Otherwise, a set speed of the high speed shaft (140) is increased (S630), until a current speed of the low speed shaft (130) reaches a minimum operating speed (S650). If, while increasing the set speed, the vibration amplitude becomes larger than the vibration limit, the maintaining is repeated.

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