APPLICABILITY OF THE CHIP COMPACTION MODEL IN THE CONTROLLING OF THE DIGESTER

摘要

The compaction of the chip column in the industrial scale conventional cooking process has been studied. The compaction and the flow of the chips through the digester determine for how long the chips stay in each section of the digester. Owing to this the compaction is an important factor to both the control of the process and the quality of the end product. When the chip compaction in the digester is known the disturbances in the process are easier to identify and rectify. In this study the compaction model has been applied to both softwood and hardwood cooking. The model has been implemented into the automation system of the studied plant. The results that describe the packing in the digester can, visually presented, be utilized in observing the movement of the chip column.