Improved Green Liquor Clarifier Performance and NPE Reduction Recausticizing • A New Look at Old Technology, 2010 TAPPI/PAPTAC International Chemical Recovery Conference

Please Note: This document will be available in PDF format in the "My Electronic Documents" link on the home page once your order has been completed. Please make sure you have the latest version of Acrobat Reader. Click on the Acrobat Reader icon to check for the latest version, it’s FREE. To print a hardcopy of a PDF file correctly you must have a postscript printer. If you are not sure if your printer is a postscript printer please refer to your owner’s manual.

Recausticizing clarifier technology was reinvestigated using state-of-the-art computer flow simulation with the objective of increasing their performance to the level of the available filtration technology. Two and three dimensional computation fluid dynamic models were created of conventional green liquor clarifiers and alternative designs were optimized using the computational tools to determine tank circulation characteristics. Feedwell and bustlepipe design constraints included tank geometry, ability to handle entrained solids, gases and to be supportable with the existing structures. Several clarifiers have been retrofitted with New Feedwells and Bustlepipe systems which yielded significant reductions in Non Process Elements (NPE’s) throughout the liquor cycle.