Dynamic simulation studies for enhanced board machine control

Abstract A dynamic simulation model of a 3-layer board machine was developed. The simulation model consists of stock preparation and proportioning, short circulations, wire and press sections, and drying section including the steam and condensate systems. Physical, first principles models were used whenever possible. The control system and automatic grade change program were modelled as well. The simulator was extensively validated against measurements. Two simulation cases concerning grade changes are discussed: re-tuning of the automatic grade change program, and studying the potential of a new dryer.