| 摘要 |
The present invention is concerned with the field of process control, in particular a method for optimal operation of a mill. An operation of a gearless mill is optimized with a mill component being subject to degradation. Initially, a nominal lifetime trajectory LTn (Ä) for the component indicative of a nominal component lifetime may be provided at a future point in time Ä. In the beginning a trajectory of input values u (Ä) of local controllers for flows and levels is determined. Subsequently, by simulating the mill behaviour from the trajectory of input values u (Ä) a corresponding lifetime trajectory LTp (Ä) of the component is determined. In a next step an objective function J [ u ] is computed comprising a difference between the simulated lifetime trajectory LTp ( Ä ) and the nominal lifetime trajectory LTn ( Ä ) or an integral of said difference. Subsequently, the steps of determining a trajectory of input values, determining a corresponding lifetime trajectory, and computing an objective function are repeated with an optimisation module 1 varying the trajectory of input values u ( Ä ) until an optimised value of the objective function J [ u ] is arrived at. Finally, a first or earliest input value u* (Ä 1 ) of the trajectory of input values that optimizes the objective function J [ u ] is applied to the mill. |
