Abstract: A solution for controlling cellulose processing includes performing optically first measurements of the cellulose during the processing, performing second measurements of the cellulose by directing optical radiation to the cellulose, the radiation including at least one beam that is polarized and at least one separate beam is non-polarized, measuring attenuations and parameters of polarization of the radiation interacted with the cellulose and determining size of particles in the cellulose based on at least one comparison of the parameters of polarization and the attenuations. The processing is controlled based on the first measurements until a given threshold of the first measurements has been reached and thereafter controlling the processing based on the second measurements.

Abstract: 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.

Abstract: 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.

Abstract: 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.