A DYNAMIC-MODEL OF PRESSURE SCREENS FOR FAULT-DETECTION

The ''classical'' control scheme for pulp pressure screens regards the screen as a static system. Out of several faults that could occur dur ing screen operation, it addressed only the possibility of plate plugg ing. Among other drawbacks, this method restricts the screen throughpu t. After testing different parametric and nonparametric methods for fa ult detection on screens, it was could that a mathematical model devel oped at the Pulp and Paper Centre in The University of British Columbi a has potential for its use as diagnosis tool. By monitoring some of t he process parameters of the screen included in this dynamic model, in cipient malfunctions of the screen could be detected and failure could be prevented. The pressure screen model is part of a general strategy for diagnosing and controlling pressure screens.