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Journal articles
Magazine articles
Open Access
Evaluation of novel drum chipper technology: pilot-scale production of short wood chips, TAPPI Journal October 2019

ABSTRACT: Impregnation of wood chips with acidic pulping liquors is improved when using short chip lengths. If the average wood chip length is too short, conventional chipping technology will generate excess small material, such as pin chips and fines. The possibility of using newly developed drum chipping technology to produce short-length wood chips was evaluated with a pilot drum chipper operating at different drum velocities and in-feed angles. With a drum velocity of 30 m/s, the average wood chip lengths and the combined fractions of pin chips and fines were 24 mm and 3.3%, 22 mm and 4.2%, and 17 mm and 8.5%. The highest fractions of total accept chips (large and small accepts), 89% to 90% without screening, were observed for drum velocities of 30•34 m/s and average wood chips lengths of 21•22 mm. The results indicate the potential of drum chipping technology for producing short wood chips with relatively high fractions of accept chips and tolerable fractions of pin chips and fines.

Journal articles
Magazine articles
Open Access
Exergy and sensibility analysis of each individual effect in a kraft multiple effect evaporator, TAPPI Journal October 2019

ABSTRACT: The multiple effect evaporator (MEE) is an energy intensive step in the kraft pulping process. The exergetic analysis can be useful for locating irreversibilities in the process and pointing out which equipment is less efficient, and it could also be the object of optimization studies. In the present work, each evaporator of a real kraft system has been individually described using mass balance and thermodynamics principles (the first and the second laws). Real data from a kraft MEE were collected from a Brazilian plant and were used for the estimation of heat transfer coefficients in a nonlinear optimization problem, as well as for the validation of the model. An exergetic analysis was made for each effect individually, which resulted in effects 1A and 1B being the least efficient, and therefore having the greatest potential for improvement. A sensibility analysis was also performed, showing that steam temperature and liquor input flow rate are sensible parameters.

Journal articles
Open Access
Decreasing Calcium Oxalate Scaling by Partial Substitution of Mg(OH)2 for NaOH in the Peroxide Bleaching of Mechanical Pulps, TAPPI JOURNAL, February 2006, Vol. 5(2) (209 KB)

Decreasing Calcium Oxalate Scaling by Partial Substitution of Mg(OH)2 for NaOH in the Peroxide Bleaching of Mechanical Pulps, TAPPI JOURNAL, February 2006, Vol. 5(2) (209 KB)

Journal articles
Open Access
Characterization of Chemical Pulp Fines, TAPPI JOURNAL, February 2006, Vol. 5(2) (6.30 KB)

Characterization of Chemical Pulp Fines, TAPPI JOURNAL, February 2006, Vol. 5(2) (6.30 KB)

Journal articles
Open Access
Materials issues in black liquor steam reforming/gasification, TAPPI JOURNAL, February 2006, Vol. 5(2) (6.3 MB)

Materials issues in black liquor steam reforming/gasification, TAPPI JOURNAL, February 2006, Vol. 5(2) (6.3 MB)

Journal articles
Open Access
Consequences of lignin precipitation in the pulp and paper industry, TAPPI JOURNAL, January 2006, Vol. 5(1) (236 KB)

Consequences of lignin precipitation in the pulp and paper industry, TAPPI JOURNAL, January 2006, Vol. 5(1) (236 KB)

Journal articles
Open Access
The effects of changing ONP quality on a newsprint mill, TAPPI JOURNAL, January 2006, Vol. 5(1) (328 KB)

The effects of changing ONP quality on a newsprint mill, TAPPI JOURNAL, January 2006, Vol. 5(1) (328 KB)

Journal articles
Open Access
Extended usage of xylanase enzyme to enhance the bleaching of softwood kraft pulp, TAPPI JOURNAL, January 2006, Vol. 5(1) (164 KB)

Extended usage of xylanase enzyme to enhance the bleaching of softwood kraft pulp, TAPPI JOURNAL, January 2006, Vol. 5(1) (164 KB)

Journal articles
Open Access
The recyclability of papers treated with environmentally friendly PET polyesters, TAPPI JOURNAL, January 2006, Vol. 5(1) (332 KB)

The recyclability of papers treated with environmentally friendly PET polyesters, TAPPI JOURNAL, January 2006, Vol. 5(1) (332 KB)

Journal articles
Open Access
Evaluation of the APMP process for mature and juvenile loblo

Evaluation of the APMP process for mature and juvenile loblolly pine, TAPPI JOURNAL, July 2006, Vol. 5(7)

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