Stability control system and method for centrifugal...

F - Mech Eng,Light,Heat,Weapons – 25 – B

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F25B 49/02 (2006.01) F04B 41/06 (2006.01) F04B 49/06 (2006.01) F04D 27/02 (2006.01) F25B 31/00 (2006.01)

Patent

CA 2492465

A control system is provided to maintain stable operating conditions for centrifugal compressors operating in parallel when one of the centrifugal compressors enters into an unstable operating condition. The control system determines an unstable operating condition in response to signals indicating the motor current or power consumption of each compressor and the position of the pre-rotation vanes of the compressors. Once an unstable operating condition is determined, the control system closes the pre-rotation vanes to each compressor until the unstable operating condition has been corrected.

L'invention concerne un système de commande permettant de maintenir des conditions de fonctionnement stables pour des compresseurs centrifuges (108, 110) fonctionnant en parallèle lorsqu'un des compresseurs (108, 110) se trouve dans une condition de fonctionnement instable. Le système de commande détermine une condition de fonctionnement instable en réaction à des signaux (172, 174, 176, 178) indiquant le courant du moteur ou la consommation d'énergie de chaque compresseur (108, 110) et la position des vannes de prérotation (120, 121) des compresseurs (108, 110). Une fois que la condition de fonctionnement instable est déterminée, le système de commande ferme les vannes de prérotation (120, 121) à chaque compresseur (108, 110) jusqu'à ce que la condition de fonctionnement instable soit corrigée.

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