DEVELOPMENTS IN SENSORS AND CONTROL STRATEGIES FOR REFINERS - REPORTSOF A NOVEL-APPROACH TO REFINER CONTROL

Variations in chip density and moisture content are the source of many of the disturbances in refiner operation and are very difficult to me asure on-line and frequently enough to implement closed loop control o f the refiner. A novel approach is to measure consistency in the refin er blow-line on a continuous basis and to use the measurement to contr ol dilution water flow and chip feed. Variations in refiner power and blow-line consistency have been reduced significantly. The benefits ob tained-are improved quality energy savings, increased line availabilit y and production.