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Continuous digester rapid thinning, TAPPI Journal June 2024
ABSTRACT: Carbon steel continuous digesters built after the early 1980s are fully stress relieved, so stress corrosion cracking has been less of a concern. However, these newer digesters were designed to run modified cooking processes that have turned out to be much more corrosive than those running with conventional cooking. This corrosion is mainly associated with softwood digesters and appears to be flow related. Average corrosion rates of 40 mil/year are possible on the exposed shell between the wash and extraction screens. The corrosion patterns are visually distinct from surfaces in the upper digester and below the wash screens. This paper goes into practical detail on where it occurs, the causes, visual identification, inspection planning and results evaluation, and finally, how to mitigate this damage, which consists of applying a corrosion resistant barrier. Some discussion on dealing with general corrosion throughout the digester is included.
Journal articles
Magazine articles
Case study: Paper mill power plant optimization—balancing steam venting with mill demand, TAPPI Journal June 2020
ABSTRACT: Most Power departments are tasked with generating steam to support mill wide operations, generate electricity, and reduce operating costs. To accomplish these tasks, power boilers generate high pressure steam that is reduced to intermediate and low pressures for process utilization in the mill by means of steam turbine generator extraction or pressure reducing valves. The most economical method to reduce steam pressure is the use of steam turbine generators, as electricity is generated from the steam when it is reduced in pressure. Electricity that is produced by these generators provides a substantial financial benefit and helps offset overall operational costs. To achieve tangible financial gains, the mill must evaluate the overall cost of steam production and the price of electricity.The current work provides a case study of power plant optimization that evaluated electricity production and steam production costs balanced with mill steam demand. Process and cost optimization led to a significant reduc-tion in low pressure steam venting, resulting in reduced fuel consumption and reduced operating cost.
Journal articles
Effect of ultraviolet irradiation on the thermal stability of bleached eucalyptus kraft pulp, TAPPI JOURNAL February 2012
Effect of ultraviolet irradiation on the thermal stability of bleached eucalyptus kraft pulp, TAPPI JOURNAL February 2012
Journal articles
Prebleaching of eucalypt kraft pulp with OP stages: Effect of an acid pretreatment or chelation step, TAPPI JOURNAL June 2012
Prebleaching of eucalypt kraft pulp with OP stages: Effect of an acid pretreatment or chelation step, TAPPI JOURNAL June 2012
Journal articles
Biorefining to recover aromatic compounds with biological properties, TAPPI JOURNAL 2015 March - 15MAR187
Biorefining to recover aromatic compounds with biological properties, TAPPI JOURNAL March 2015
Journal articles
Mill-scale experiences of extended delignification with super batch cooking method, TAPPI JOURNAL, August 1990, Vol. 73(8)
Mill-scale experiences of extended delignification with super batch cooking method, TAPPI JOURNAL, August 1990, Vol. 73(8)
Journal articles
Biological bleaching of softwood kraft pulp with the fungus trametes (coriolus) versicolor, TAPPI JOURNAL, August 1990, Vol. 73(8)
Biological bleaching of softwood kraft pulp with the fungus trametes (coriolus) versicolor, TAPPI JOURNAL, August 1990, Vol. 73(8)
Journal articles
Chlorinated organic matter in bleached chemical pulp production part 6: chlorinated compounds in effluents, TAPPI JOURNAL, January 1990, Vol. 73(1)
Chlorinated organic matter in bleached chemical pulp production part 6: chlorinated compounds in effluents, TAPPI JOURNAL, January 1990, Vol. 73(1)
Journal articles
Design and implementation of a commercial acoustic leak-detection system for black liquor recovery boilers, TAPPI JOURNAL, July 1990, Vol. 73(7)
Design and implementation of a commercial acoustic leak-detection system for black liquor recovery boilers, TAPPI JOURNAL, July 1990, Vol. 73(7)
Journal articles
Maintenance of medium-voltage vacuum circuit breakers, TAPPI JOURNAL, March 1990, Vol. 73(3)
Maintenance of medium-voltage vacuum circuit breakers, TAPPI JOURNAL, March 1990, Vol. 73(3)