Bleach Plant Optimization at the Resolute Forest Products Coosa Pines Pulp Mill

摘要

At the Resolute Forest Products' Coosa Pines mill, bleach plant benchmarking was used to identify opportunities for optimization and operating cost reduction. These included: 1. Implementation of ratio control for the Eop-stage caustic dosage in D-Bleachery, decreasing caustic use by 22%; 2. Elimination of peroxide from the E-Bleachery EO stage, for a net decrease in bleaching cost. As well, additional opportunities were identified, requiring further action: 3. Improving Eop-stage washing in D-Bleachery to decrease carryover into the D1 stage, thereby decreasing chlorine dioxide use; 4. Addition of peroxide to the E2 stage of D-Bleachery to decrease chlorine dioxide use. 5. Optimization of D2-stage pH to improve bleaching efficiency.