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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
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
Detailed characterization of poor settling green liquor dregs, TAPPI JOURNAL September 2013
Detailed characterization of poor settling green liquor dregs, TAPPI JOURNAL September 2013
Journal articles
A theoretical analysis of recirculation in pulp refiners, TAPPI JOURNAL April 2014
A theoretical analysis of recirculation in pulp refiners, TAPPI JOURNAL April 2014
Journal articles
Editorial: Peer-Reviewed Engineering highlights from PEERS 2013, TAPPI JOURNAL August 2014
Editorial: Peer-Reviewed Engineering highlights from PEERS 2013, TAPPI JOURNAL August 2014
Journal articles
Brownstock washing A review of the literature, TAPPI JOURNAL January 2014
Brownstock washing A review of the literature, TAPPI JOURNAL January 2014
Journal articles
Multiple faults detection and isolation approach applied to a kraft recovery boiler, TAPPI JOURNAL January 2014
Multiple faults detection and isolation approach applied to a kraft recovery boiler, TAPPI JOURNAL January 2014
Journal articles
Inter-laboratory comparisons of hexenuronic acid measurements in kraft eucalyptus pulps using a UV-Vis spectroscopic method, TAPPI JOURNAL January 2014
Inter-laboratory comparisons of hexenuronic acid measurements in kraft eucalyptus pulps using a UV-Vis spectroscopic method, TAPPI JOURNAL January 2014
Journal articles
Characterization of thin pigment coating layers produced by foam coating, TAPPI JOURNAL July 2014
Characterization of thin pigment coating layers produced by foam coating, TAPPI JOURNAL July 2014
Journal articles
Cationization of oat ?-D glucan as a dry-strength additive for paper, TAPPI JOURNAL July 2014
Cationization of oat ?-D glucan as a dry-strength additive for paper, TAPPI JOURNAL July 2014