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Journal articles
Characterization of the pore structure and clay orientation in curtain coating layers using SEM and image analysis, TAPPI JOURNAL August 2013
Characterization of the pore structure and clay orientation in curtain coating layers using SEM and image analysis, TAPPI JOURNAL August 2013
Journal articles
Acid methanolysis: An analytical tool for estimating the proportions of different pulp types in deinked pulp or recovered paper, TAPPI JOURNAL August 2013
Acid methanolysis: An analytical tool for estimating the proportions of different pulp types in deinked pulp or recovered paper, TAPPI JOURNAL August 2013
Journal articles
Magazine articles
On the diagnosis of a fouling condition in a kraft recovery boiler: combining process knowledge and data-based insights, TAPPI Journal March 2023
ABSTRACT: Fouling is still a major challenge for the operation of kraft recovery boilers. This problem is caused by accumulation of ash deposits on the surfaces of heat exchangers in the upper part of the boiler over time. The first consequence is the reduction of steam production due to loss of heat transfer and, finally, the shutdown of the boiler due to clogging. The present work investigated the operational condition of a modern kraft boiler under a critical fouling condition. This boiler had even faced a manual cleaning due to a clogging event. This analysis combined process knowledge, plant team experience, and a data-driven approach, given the complexity of the process. In this sense, historical data covering this critical period of operation were collected. After a cleaning procedure, they were used to obtain a predictive neural network model for the flue gas pressure drop in the boiler bank, which is an indirect measure of ash deposit accumulation. Once validated, it was used for sensitivity analysis, with the aim of quantifying the effects of the model inputs. Five variables out of eighteen accounted for nearly 60% of the total effect on pressure drop. Namely, primary air temperature (21.6% of the total effect) and flow rate (11.1%), black liquor flow rate (9.9%) and temperature (8.4%), and white liquor sulfidity (8.6%). The analysis of these results mainly suggested an excess of carryover, which composes the ash deposits. Recommended actions to mitigate the fouling condition involved adjustments to the primary air system before the more drastic solution of reducing the boiler load.
Journal articles
Development and Application of a Real-Time Recovery Boiler E
Development and Application of a Real-Time Recovery Boiler Expert System, 1991 Engineering Conference Proceedings
Journal articles
Environmentally friendly pulping of rice straw to eliminate black liquor discharge, TAPPI Journal 10AUG07
Environmentally friendly pulping of rice straw to eliminate black liquor discharge, TAPPI JOURNAL August 2010
Journal articles
Characterization of spruce thermomechanical pulps at the fiber cell wall level: a method for quantitatively assessing pulp fiber development using Simonsâ?? stain, TAPPI JOURNAL October 2010
Characterization of spruce thermomechanical pulps at the fiber cell wall level: a method for quantitatively assessing pulp fiber development using Simons’ stain, TAPPI JOURNAL October 2010
Journal articles
In-Situ Measurements of Sootblower Jet Impact in a Recovery Boiler, TAPPI JOURNAL February 2011
In-Situ Measurements of Sootblower Jet Impact in a Recovery Boiler, TAPPI JOURNAL February 2011
Journal articles
Effects of Loblolly Pine Wood and Pulp Properties on Sheet Characteristics, TAPPI JOURNAL February 2011
Effects of Loblolly Pine Wood and Pulp Properties on Sheet Characteristics, TAPPI JOURNAL February 2011
Journal articles
Influence of chlorine and potassium on operation and design of chemical recovery equipment, TAPPI JOURNAL, January 2011
Influence of chlorine and potassium on operation and design of chemical recovery equipment, TAPPI JOURNAL, January 2011
Journal articles
Polysulfide-borohydride modification of southern pine alkaline pulping integrated with hydrothermal pre-extraction of hemicelluloses, TAPPI JOURNAL July 2011
Polysulfide-borohydride modification of southern pine alkaline pulping integrated with hydrothermal pre-extraction of hemicelluloses, TAPPI JOURNAL July 2011