Integrating Stiction diagnosis and Stiction Compensation in Process Control Valves

摘要

Limit cycles caused due to valve non-linearity such as stiction can be eliminated with proper valve maintenance. Since valve maintenance is usually scheduled during production stops and with production stops scheduled typically once every six months to three years, the loss of product quality and energy loss during this intermediate period can be quite high. Stiction com-pensation algorithms can mitigate this problem to a large extent. In this paper, an optimization based approach for stiction compensation much in the sprit of predictive control strategies is proposed.