CLEARFLOW™ Feedwell and Bustle pipes systems for green and liquor clarifiers have been developed by McFarlen Eng using 3D fluid dynamic modeling technology to improve the removal of kinetic energy in the feedstrem to the clarifier, which allows dregs and lime mud particle to settle efficiently into the clarifier resulting in Improved clarity of green and white liquor. This leads to improve filter ability of the lime mud and reduce scaling in the digester, reducing chemical bleaching cost.
CLEARFLOW™ TECHNOLOGY OVERVIEW
Reduction of turbidity in the liquor from green, white and mud washing clarifiers improves the operation
of the Recaust Plant. Many pulp mills have increased the loading on their clarifiers in order to meet greater
demands for liquor in the digesters. In addition, hydrodynamic modeling shows that older technology for
feedwell and bustle pipe design is inadequate to sustain flows above critical levels where product clarity
decreases dramatically. As a result, low turbidity may not be achieved even when injecting polymer.