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Magazine articles
Evaluating the effect of recovery boiler operation on green liquor dregs concentration using multivariate analysis, TAPPI Journal June 2023
ABSTRACT: Poor settling and filterability of green liquor dregs has been a persistent problem in many kraft pulp mills. While the concentration and settling/filtering behaviors of dregs are expected to be related to how black liquor is burned in recovery boilers, the effect of boiler operation is not well understood. A systematic study was conducted to examine how recovery boiler operation may affect the dregs concentration in the raw green liquor (RGL) at three kraft pulp mills using SIMCA, a multivariate data analysis (MVDA) program. Daily average boiler operating data from three kraft mills were analyzed over a 3-year period. Results of both principal component analysis (PCA) and partial least squares regression (PLS) suggest that the main boiler operations contributing to high dregs concentrations in RGL are low liquor firing load, low bed temperature, poor char burning, and unstable char bed.
Journal articles
Magazine articles
Water chemistry challenges in pulping and papermaking • fundamentals and practical insights: Part 2: Conductivity, charge, and hardness, TAPPI Journal June 2023
ABSTRACT: Although water is essential to the papermaking process, papermakers often overlook its importance and focus on fibers, fillers, and chemical additives. A better understanding of water properties and chemical interactions associated with water at the wet end leads to a sound foundation for high-quality paper production and smooth operation. Water is an excellent solvent for ionic substances, both organic and inorganic. These substances contribute to system conductivity, charge, and hardness and significantly impact the papermaking process. Part 1 of this paper, published in TAPPI J. 21(6): 313(2022), discussed fundamental water properties, water chemistry, and the impact of pH on pulping and papermaking operations. In this paper, we review definitions, sources, and the typical symptoms of the effect of conductivity, charge, and hardness on the productivity of the papermaking process. Sources of conductivity, charge, and hardness impacting these factors, measurement methods, and available correction strategies for their control are also discussed.
Journal articles
Decreasing specific energy of thermomechanical pulps from reduction of raw materials variability, TAPPI JOURNAL September 2009
Decreasing specific energy of thermomechanical pulps from reduction of raw materials variability, TAPPI JOURNAL September 2009
Journal articles
Pre-Extraction of Hemicelluloses and Subsequent Kraft Pulping, Part II: Acid- and Autohydrolysis, TAPPI JOURNAL September 2009
Pre-Extraction of Hemicelluloses and Subsequent Kraft Pulping, Part II: Acid- and Autohydrolysis, TAPPI JOURNAL September 2009
Journal articles
Optimization of ECF Bleaching of Kraft Pulp: Part 1. Optimal Bleaching of Hardwood Pulps Made with DifferentAlkali Charges, TAPPI JOURNAL January 2008
Optimization of ECF Bleaching of Kraft Pulp: Part 1. Optimal Bleaching of Hardwood Pulps Made with DifferentAlkali Charges, TAPPI JOURNAL January 2008
Journal articles
Determination of the mineral constituents of recycled paper mill sludge, TAPPI JOURNAL June 2008
Determination of the mineral constituents of recycled paper mill sludge, TAPPI JOURNAL June 2008
Journal articles
Smelt spout corrosion in a recovery boiler, TAPPI JOURNAL August 2010
Smelt spout corrosion in a recovery boiler, TAPPI JOURNAL August 2010
Journal articles
Performance of High Vacuum Dewatering Elements in the Formin
Performance of High Vacuum Dewatering Elements in the Forming Section, 1993 Engineering Conference Proceedings
Journal articles
Cold Blow Batch Cooking Plus Medium Consistency Oxygen: Heat
Cold Blow Batch Cooking Plus Medium Consistency Oxygen: Heat Exchanger Placement, 1993 Engineering Conference Proceedings
Journal articles
Editorial: Advances in Pulp Manufacture: A review of the 2012 PEERS Conference, TAPPI JOURNAL February 2013
Editorial: Advances in Pulp Manufacture: A review of the 2012 PEERS Conference, TAPPI JOURNAL February 2013