Deposit Management for the Bleach Plant, 2009 TAPPI Engineering, Pulping, Environmental 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.

Scale formation on pulp bleaching equipment typically brings inefficiencies to the pulping process because of downtime losses, higher utility costs, and corrosion. Nalco deposit management technology for bleach plants is based on a synergistic approach combining deposit monitoring, scale inhibitor application and operational best practices. Proprietary deposit inhibitors are designed to address all major deposit issues caused by typical bleach plant scales such as calcium carbonate, calcium oxalate, and barium sulfate. The application of chemical inhibitors extends the time between shutdowns for cleaning, thus reducing operational costs. This also minimizes the effect of wood supply variability on the mill’s operation. We use proprietary monitoring methods and tools based on microbalance technology for deposit inhibitor dose optimization, trial evaluation and studying of the effect of process conditions on the deposit propensity of the media. Examples of the multidimensional approach are discussed, including benchtop assessment and field implementation of antiscale and boilout chemistries, optimization of deposit control programs, and giving an advance warning of process problems.