Method and apparatus for executing grade change in paper machine grade
AssigneeMetso Paper Automation Oy
InventorTaisto Huhtelin
Life of this patent
Estimating the term…
Abstract
The invention relates to a method and an apparatus for executing a grade change in a paper machine, in which method a grade change is executed by determining, in advance, target ramps for different process variables, which are ramped according to said ramps during the grade change. Data about the grade changes already executed is collected, whereafter data about successful grade changes is selected and the grade change models to be used are determined on the basis of this data, and the target ramps are determined by means of these grade change models.
Claims9
A method for executing a grade change in a paper machine, the method comprising determining target ramps in advance for controlled variables of the process, which are ramped according to said target ramps during the grade change, collecting data about the grade changes already executed and thereafter determining grade change models by selecting the data about successful grade changes, the grade change models describing the dynamic behavior of the process during the grade change, and determining the target ramps by means of the grade change models.
An apparatus for executing a grade change in a paper machine, the apparatus comprising control means that contain target ramps, which have been defined in advance for the controlled variables of the process and according to which the variables are ramped during the grade change, wherein the target ramps supplied to the control means have been determined by means of grade change models defined on the basis of successful grade changes, the grade change models describing the dynamic behavior of the process during the grade change.
Dependencies are inferred from the claim text.