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Evaluating the effect of recovery boiler operation on green liquor dregs concentration using multivariate analysis, TAPPI Journal June 2023
ABSTRACT: Poor settling and filterability of green liquor dregs has been a persistent problem in many kraft pulp mills. While the concentration and settling/filtering behaviors of dregs are expected to be related to how black liquor is burned in recovery boilers, the effect of boiler operation is not well understood. A systematic study was conducted to examine how recovery boiler operation may affect the dregs concentration in the raw green liquor (RGL) at three kraft pulp mills using SIMCA, a multivariate data analysis (MVDA) program. Daily average boiler operating data from three kraft mills were analyzed over a 3-year period. Results of both principal component analysis (PCA) and partial least squares regression (PLS) suggest that the main boiler operations contributing to high dregs concentrations in RGL are low liquor firing load, low bed temperature, poor char burning, and unstable char bed.
Journal articles
Profiling the wood and pulping properties of southern pine thinning resources, TAPPI JOURNAL & Solutions! January 2005
Profiling the wood and pulping properties of southern pine thinning resources, TAPPI JOURNAL & Solutions! January 2005
Journal articles
A useful equation for estimating the surface charge of pulp fibers, TAPPI JOURNAL May 2005, Vol. 4(5)
A useful equation for estimating the surface charge of pulp fibers, TAPPI JOURNAL May 2005, Vol. 4(5)
Journal articles
Recovery of Sulfur from Spent Semichemical Pulping Liquors,
Recovery of Sulfur from Spent Semichemical Pulping Liquors, 1991 Engineering Conference Proceedings
Journal articles
Magazine articles
Removal of silicon from green liquor with low-temperature precausticizing, TAPPI JOURNAL January 2017
Removal of silicon from green liquor with low-temperature precausticizing, TAPPI JOURNAL January 2017
Journal articles
Magazine articles
Fiber-based characterization of pulp refining, TAPPI Journal September 2022
ABSTRACT: Fiber development in pulp refining can be characterized by three parameters: number of impacts on pulp, N; energy per impact, I, and bar force on fibers, F. These parameters enable comparisons of radically different refining conditions; determination of intensity for hardwoods and softwoods; assessment of effect of bar width on fiber shortening; and predictions of tensile strength increases.
Journal articles
Magazine articles
Advantages of lean duplex stainless steels in the pulp and paper industry, TAPPI Journal April 2023
ABSTRACT: The performance of lean duplex stainless steels has been utilized by the pulp and paper industry since their introduction to the market almost 20 years ago. Experience has shown that this group of stainless steels has exceptional performance in, for example, alkaline environments towards typical deterioration mechanisms, i.e., uniform corrosion and stress corrosion cracking. The chemistry of the “lean” duplex steels is designed so that the content of volatile and expensive elements like nickel and molybdenum can be reduced to an absolute minimum without sacrificing the technical performance. This reduces the raw material cost and most importantly provides predictability of the steel price, which is often challenging with conventional austenitic and duplex stainless steels.Thanks to a dual phase microstructure and high nitrogen content, lean duplex steels have at least two times higher strength compared to standard austenitic stainless steels. This is often a preferred feature in pulp and paper construction, as it enables lighter structures and less material to be utilized. Today, lean duplex steels are widely available in various dimensions, from thin cold rolled sheets up to thick hot rolled plates. Lean duplex steels are also fully recyclable after the decommissioning stage of the equipment, thereby contributing to the circular economy.
Journal articles
Dimensioning a recovery boiler furnace using mathematical optimization 15FEB119
Dimensioning a recovery boiler furnace using mathematical optimization, TAPPI JOURNAL February 2015
Journal articles
Improved steady-state models for chlorine dioxide delignification sequences that include washer carryover effects 15-Feb-93
Improved steady-state models for chlorine dioxide delignification sequences that include washer carryover effects, TAPPI JOURNAL February 2015
Journal articles
Editorial: 2014 International Conferences • Part 2: Focus on the Liquor Cycle, TAPPI JOURNAL July 2015
Editorial: 2014 International Conferences • Part 2: Focus on the Liquor Cycle, TAPPI JOURNAL July 2015