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Journal articles
Open Access
Using bacteriophage for slime control in the paper mill, TAPPI JOURNAL, August 1990, Vol. 73(8)

Using bacteriophage for slime control in the paper mill, TAPPI JOURNAL, August 1990, Vol. 73(8)

Journal articles
Open Access
Model to Predict the Precipitation of Burkeite in the Multip

Model to Predict the Precipitation of Burkeite in the Multiple Effect Evaporator and Techniques for Controlling Scaling, 1995 Engineering Conference Proceedings

Journal articles
Open Access
Liquor-To-Liquor Differences in Combustion and Gasification

Liquor-To-Liquor Differences in Combustion and Gasification Processes: Nitrogen Oxide Formation Tendency, 1995 Engineering Conference Proceedings

Journal articles
Magazine articles
Open Access
Continuous digester process safety improvements • Stress corrosion cracking and overpressure protection lessons learned and opportunities, TAPPI Journal October 2024

ABSTRACT: Georgia-Pacific has recent experience with continuous digester stress corrosion cracking (SCC) repairs where the extent of SCC was more than previous spot inspections had predicted (one digester had anodic protection, one did not). This paper offers case studies of reviewed and improved digester inspections by use of “boat” samples to quantify the depth of cracking mechanism. Boat sample test data is used to support repair recommendations based on hardness testing. Georgia-Pacific also reviewed overpressure protection systems and corrected gaps found in these systems. These included updating to the latest original equipment manufacturer (OEM) designs and formalizing functional testing procedures and practices. This review of digester inspection, testing, and repairs since 2020 provides: (1) a basis for including a 3rd party corrosion expert to be a part of inspections; (2) removes the use of power-wire brushes; (3) enhances digester inspection with 100% phased-array ultrasonic testing to detect SCC; and (4) ensures overpressure protection design and testing is aligned with corporate needs and the site-specific challenges.

Journal articles
Magazine articles
Open Access
Experiments and visualization of sprays from beer can and turbo liquor nozzles, TAPPI Journal February 2022

ABSTRACT: Industrial scale swirl-type black liquor nozzles were studied using water as the test fluid. Simple water spraying experiments were found to be very beneficial for studying and comparing nozzles for black liquor spraying. These kinds of experiments are important for finding better nozzle designs. Three nozzle designs were investigated to understand the functional differences between these nozzles. The pressure loss of nozzle 1 (“tangential swirl”) and nozzle 3 (“turbo”) were 97% and 38% higher compared to nozzle 2 (“tan-gential swirl”). Spray opening angles were 75°, 60°, and 35° for nozzles 1, 2, and 3, respectively. Video imaging showed that the nozzles produced sprays that were inclined a few degrees from the nozzle centerline. Spray patter-nation showed all the sprays to be asymmetric, while nozzle 2 was the most symmetric. Laser-Doppler measure-ments showed large differences in spray velocities between nozzles. The spray velocity for nozzle 1 increased from 9 m/s to 15 m/s when the flow rate was increased from 1.5 L/s to 2.5 L/s. The resulting velocity increase for nozzle 2 was from 7 m/s to 11 m/s, and for nozzle 3, it was from 8 m/s to 13 m/s. Tangential flow (swirl) directed the spray 6°•12° away from the vertical plane. Liquid sheet breakup mechanisms and lengths were estimated by analyzing high speed video images. The liquid sheet breakup mechanism for nozzle 1 was estimated to be wave formation, and the sheet length was estimated to be about 10 cm. Sheet breakup mechanisms for nozzle 2 were wave formation and sheet perforation, and the sheet length was about 20 cm. Nozzle 3 was not supposed to form a liquid sheet. Nozzle geometry was found to greatly affect spray characteristics.

Journal articles
Open Access
Transfer of cationic retention aid from fibers to fine particles and cleavage of polymer chains under wet-end papermaking conditions, TAPPI JOURNAL, May 1993, Vol. 76(5)

Transfer of cationic retention aid from fibers to fine particles and cleavage of polymer chains under wet-end papermaking conditions, TAPPI JOURNAL, May 1993, Vol. 76(5)

Journal articles
Open Access
Bleaching and brightness stability of aspen biomechanical pulps, TAPPI JOURNAL, November 1993, Vol. 76(11)

Bleaching and brightness stability of aspen biomechanical pulps, TAPPI JOURNAL, November 1993, Vol. 76(11)

Journal articles
Open Access
Dimethyldioxirane as a nonchlorine agent for chemical pulp bleaching, TAPPI JOURNAL, November 1993, Vol. 76(11)

Dimethyldioxirane as a nonchlorine agent for chemical pulp bleaching, TAPPI JOURNAL, November 1993, Vol. 76(11)

Journal articles
Open Access
Ozone bleaching of recycled paper, TAPPI JOURNAL, November 1993, Vol. 76(11)

Ozone bleaching of recycled paper, TAPPI JOURNAL, November 1993, Vol. 76(11)

Journal articles
Open Access
Steam drying and fluidized-bed calcination of lime and mud, TAPPI JOURNAL, November 1993, Vol. 76(11)

Steam drying and fluidized-bed calcination of lime and mud, TAPPI JOURNAL, November 1993, Vol. 76(11)

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