Metso Paper Inc.

Valmet Automation Oy

Juha Ojanen

Juha Lipponen

Antti Kuhasalo

Harri Happonen

Hans Sundqvist

Pasi Virtanen

Jukka Pennanen

Kristian Hamstrom

J&auml;rkko Nurmi

A controller of a process includes a resource consumption optimizer which receives sets of control actions for a plurality of actuators from an advanced process controller performing independent data processing with respect to the resource consumption optimizer, each set of control actions resulting in a set-specific combined control action effect. The resource consumption optimizer optimizes resource consumption associated with the sets of control actions by modifying at least one control action on the basis of resource consumption associated with the actuator performing the control action while keeping a difference between a combined control action effect of a modified control action set and a combined control action effect a received control action set set-specifically within an accepted range.

Optimization of a process

A method and apparatus effect drying of a paper web using a plurality of heated drying cylinders and at least one air impingement module having a hood. The paper web is brought into operative contact with the heated drying cylinders, and at least one of the final moisture content, quality, and cross-direction profile of the paper web is regulated. The regulation is effected by adjusting the efficiency of air impingement drying of the paper web, by adjusting at least one of the blowing velocity of the medium (typically air) blown against the paper web, the humidity of the blowing medium, and the distance of the hood of the impingement module from the paper web. At least one of the final moisture content of the paper web and its quality may also be regulated by adjusting the steam pressure of one or more drying cylinder groups. Typically the final moisture content of the web is measured after the last drying cylinder group and the efficiency of air impingement drying is regulated on the basis of that measurement.

Method and apparatus for drying a paper web

Growing community of inventors

Valkeakoski, Finland

Juha Ojanen