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Journal articles
Integration of hemicellulose pre-extraction in the bleach-grade pulp production process, TAPPI JOURNAL October 2013
Integration of hemicellulose pre-extraction in the bleach-grade pulp production process, TAPPI JOURNAL October 2013
Journal articles
Magazine articles
How to use total dissolved solids measurements to evaluate the performance of diffuser washers—A mill study, TAPPI Journal April 2020
ABSTRACT: Various types of pulp washing equipment are available. Each washing device has a unique mechanical construction, and the washing principle is often a combination of dilution, thickening, and displacement washing. In this work, the performance of the pressure diffuser washer is studied. In stepwise trials, the effect of the feed and discharge consistencies on the performance of the diffuser was studied. The effect of the downward velocity of the screen on the pressure diffuser’s washing efficiency was also studied. The measurement of total dissolved solids (TDS) by a process refractometer was used as a wash loss measurement unit and the refractometer’s results were used in the calculations of standardized Nordén efficiency (E10) values. The chemical oxygen demand (COD) and conductivity values were also measured and their results compared to the TDS results.The results indicated that feed consistency has a significant effect on the performance and effectiveness of the diffuser washers in the mill. It can also be stated that when the downward velocity of the screen is adjusted to too high a level, the washing efficiency of the pressure diffuser decreases. As a conclusion from the mill tests, it can be stated that even small process parameter changes can provide enhanced diffuser washing at the beginning of the washing line, which has a direct effect on the performance of post-oxygen washing.
Journal articles
Magazine articles
Mill experience of calcium carbonate scale formation in green liquor pipelines, TAPPI Journal August 2020
ABSTRACT: Experience of hard calcite (CaCO3) scale formation in green liquor pipelines at four kraft pulp mills was systematically investigated to determine if there is any correlation between the severity of the scaling problem at each mill and the design and operating conditions of its causticizing plant. The results show that the high degree of supersaturation of calcium ions (Ca2+) in the liquor is the main contributing factor. Mills that operate at a lower green liquor total titratable alkali (TTA), higher causticity, and a larger liquor temperature drop are more likely to produce a green liquor that is supersaturated with Ca2+, and thus experience more severe scaling problems. In order to minimize CaCO3 scaling, the green liquor handling equipment should be operated as steady as possible to avoid conditions that allow Ca2+ to be supersaturated. The strategies include minimizing variations in liquor TTA, insulating the green liquor pipelines to reduce temperature gradients, and adding lime mud to weak wash to provide seeds for precipitation to occur on mud particles instead of on metal substrate.
Journal articles
Pilot-scale combustion studies with kraft lignin in a powder burner and a CFB boiler, TAPPI JOURNAL June 2010
Pilot-scale combustion studies with kraft lignin in a powder burner and a CFB boiler, TAPPI JOURNAL June 2010
Journal articles
Comprehensive evaluation of kraft pulp properties from fast-growing woods, TAPPI JOURNAL June 2010
Comprehensive evaluation of kraft pulp properties from fast-growing woods, TAPPI JOURNAL June 2010
Journal articles
Magazine articles
Editor's Note: An Ideal Raw Material for Pulp and Paper, TAP
Editor's Note: An Ideal Raw Material for Pulp and Paper, TAPPI JOURNAL March 2010
Journal articles
Impact of High-Yield Pulp Substitution on the Brightness Stability of Uncoated Wood-Free Paper, TAPPI JOURNAL March 2010
Impact of High-Yield Pulp Substitution on the Brightness Stability of Uncoated Wood-Free Paper, TAPPI JOURNAL March 2010
Journal articles
Water-Uptake Studies of Dry, Mountain Pine Beetle-Infested, Grey-Stage Lodgepole Pine Sapwood Chips, TAPPI JOURNAL March 2010
Water-Uptake Studies of Dry, Mountain Pine Beetle-Infested, Grey-Stage Lodgepole Pine Sapwood Chips, TAPPI JOURNAL March 2010
Journal articles
Depletion of coating color components in the blade coating process circulation, TAPPI JOURNAL September 2011
Depletion of coating color components in the blade coating process circulation, TAPPI JOURNAL September 2011
Journal articles
Properties of extracted Eucalyptus globulus kraft pulps, TAPPI JOURNAL April 2012
Properties of extracted Eucalyptus globulus kraft pulps, TAPPI JOURNAL April 2012