Performance forecast and anti-surge control system of centrifugal compressors

Based on the Greitzer surge model of the centrifugal compressors, this paper considers the surge phenomenon as the instability status of the centrifugal compressors system. And subsequently, according to the systematic analysis methods and performance similarity. transformation principle, the surge model of the centrifugal compressors system is established which forecasts its surge curve effectively. On the basis of the aforementioned surge model, the centrifugal compressors' anti-surge control system is presented. The presented control system can adaptively modify its control parameters to maintain the entire centrifugal compressors system working in the best status and improve its performance greatly. It has been proved during the application in the first branch of the Daqing natural gas company that the system effectively prevents the happening of the surge phenomenon, and the circulation flow of the compressor is automatically adjusted according to its working states.