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Journal articles
Magazine articles
Open Access
Corrosion damage and in-service inspection of retractable sootblower lances in recovery boilers, TAPPI Journal October 2021

ABSTRACT: Several reports of accidents involving serious mechanical failures of sootblower lances in chemical recovery boilers are known in the pulp and paper industry. These accidents mainly consisted of detachment and ejection of the lance tip, or even of the entire lance, to the inside of the furnace, towards the opposite wall. At least one of these cases known to the author resulted in a smelt-water explosion in the boiler.In other events, appreciable damage or near-miss conditions have already been experienced. The risk of catastrophic consequences of the eventual detachment of the lance tip or the complete lance of a recovery boiler soot-blower has caught the attention of manufacturers, who have adjusted their quality procedures, but this risk also needs to be carefully considered by the technical staff at pulp mills and in industry committees.This paper briefly describes the failure mechanisms that prevailed in past accidents, while recommending inspection and quality control policies to be applied in order to prevent further occurrences of these dangerous and costly component failures. Digital radiography, in conjunction with other well known inspection techniques, appears to be an effective means to ensure the integrity of sootblower lances in chemical recovery boilers used in the pulp and paper industry.

Journal articles
Magazine articles
Open Access
Kraft recovery boiler operation with splash plate and/or beer can nozzles — a case study, TAPPI Journal Octobr 2021

ABSTRACT: In this work, we study a boiler experiencing upper furnace plugging and availability issues. To improve the situation and increase boiler availability, the liquor spray system was tuned/modified by testing different combinations of splash plate and beer can nozzles. While beer cans are typically used in smaller furnaces, in this work, we considered a furnace with a large floor area for the study. The tested cases included: 1) all splash plate nozzles (original operation), 2) all beer can nozzles, and 3) splash plate nozzles on front and back wall and beer cans nozzles on side walls. We found that operating according to Case 3 resulted in improved overall boiler operation as compared to the original condition of using splash plates only. Additionally, we carried out computational fluid dynamics (CFD) modeling of the three liquor spray cases to better understand the furnace behavior in detail for the tested cases. Model predictions show details of furnace combus-tion characteristics such as temperature, turbulence, gas flow pattern, carryover, and char bed behavior. Simulation using only the beer can nozzles resulted in a clear reduction of carryover. However, at the same time, the predicted lower furnace temperatures close to the char bed were in some locations very low, indicating unstable bed burning. Compared to the first two cases, the model predictions using a mixed setup of splash plate and beer can nozzles showed lower carryover, but without the excessive lowering of gas temperatures close to the char bed.

Conference papers
The Effect of Contact Time Between CPAM and Colloidal Silica on the Flocculation Behaviour in the Approach Flow, 2021 TAPPICon Live (21TAPL)

The Effect of Contact Time Between CPAM and Colloidal Silica on the Flocculation Behaviour in the Approach Flow, 2021 TAPPICon Live (21TAPL)

Journal articles
Open Access
Fast evaluation of spatial coating layer formation using ultraviolet scanner imaging

Fast evaluation of spatial coating layer formation using ultraviolet scanner imaging, TAPPI JOURNAL August 2015

Conference papers
Open Access
Recent advances in the commercialization of NIR (near-infrar

ABSTRACT: Near-infrared (NIR) spectroscopy techniques have held the promise of a new generation of online and lab based process analyzers for the pulping and recovery areas for some years now. NIR technology has been shown to be a quite effective method for the analysis of white, green and black liquors by multiple investigators. NIR reflectance techniques have been shown to be effective in predicting yield and kappa number in pulp samples. Recently, commercial analyzers have been developed for green liquor analysis on the dissolving tank, white and green liquor analysis in the recaust area and black liquor analysis on batch and continuous digesters. These analyzers are currently running at different mill sites and are proving to be superior to current technology choices for these applications. A commercial online and lab based yield and kappa number analyzer are currently being developed based on NIR reflectance techniques. Results will be presented on the performance of these analyzers relating to accuracy, maintenance and total installed cost. Other potential NIR applications in the pulping and recovery area will also be addressed.

A theoretical approach to understanding microstructure-tensile modulus relations in paper coatings , 2008 Advanced Coating Fundamentals Symposium

A theoretical approach to understanding microstructure-tensile modulus relations in paper coatings , 2008 Advanced Coating Fundamentals Symposium

Characterization of Ink Adhesion Failure; Effect of Pre-dampening of Carbonate Containing Coatings , 2008 Advanced Coating Fundamentals Symposium

Characterization of Ink Adhesion Failure; Effect of Pre-dampening of Carbonate Containing Coatings , 2008 Advanced Coating Fundamentals Symposium

Effect of Particle Size Distribution and Packing Compression on Fluid Permeability: A Comparison of Experiments and Monte-Carlo/Lattice-Boltzmann Simulations, 2008 Advanced Coating Fundamentals Symposium

Effect of Particle Size Distribution and Packing Compression on Fluid Permeability: A Comparison of Experiments and Monte-Carlo/Lattice-Boltzmann Simulations, 2008 Advanced Coating Fundamentals Symposium

Latex Dispersions as Carriers for Glucose Oxidase Oxygen Scavenging Systems, 2008 Advanced Coating Fundamentals Symposium

Latex Dispersions as Carriers for Glucose Oxidase Oxygen Scavenging Systems, 2008 Advanced Coating Fundamentals Symposium

MOISTURE PICKUP IN CALCIUM CARBONATE COATING STRUCTURES: role of surface and pore structure geometry, 2008 Advanced Coating Fundamentals Symposium

MOISTURE PICKUP IN CALCIUM CARBONATE COATING STRUCTURES: role of surface and pore structure geometry, 2008 Advanced Coating Fundamentals Symposium

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