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TAPPI Journal Summaries, Paper360º September/October 2019
TAPPI Journal Summaries, Paper360º September/October 2019
Journal articles
Magazine articles
Modeling of the energy of a smelt-water explosion in the recovery boiler dissolving tank, TAPPI Journal August 2020
ABSTRACT: The explosion energy generated as molten smelt droplets interact with water was evaluated as a function of smelt distribution, water temperature, and smelt temperature using a thermodynamic model. The results show that increasing smelt-to-water volume ratio and water temperature significantly increases the explosion energy, converting a larger proportion of the thermal energy of smelt into mechanical work. To reduce the chance of violent smelt-water explosions, it is important to: i) optimize the shatter jet design and operation to uniformly distribute the smelt over a large area in the dissolving tank; ii) avoid high green liquor temperature and ensure adequate liquor mixing; and iii) avoid upsets that may cause heavy smelt runoff or jellyroll smelt.
Journal articles
Magazine articles
Slave Lake Pulp Generates Biogas, Saves Money, Paper360º November/December 2019
Slave Lake Pulp Generates Biogas, Saves Money, Paper360º November/December 2019
Journal articles
Magazine articles
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
Magazine articles
Air and Water Management: Meeting the Ongoing Challenges, Paper360º September/October
Air and Water Management: Meeting the Ongoing Challenges, Paper360º September/October
Magazine articles
Five Steps to Excellent Communications on the Job, Solutions!, February 2006, Vol. 89(2) (159 KB)
Five Steps to Excellent Communications on the Job, Solutions!, February 2006, Vol. 89(2) (159 KB)
Magazine articles
A Retirement Tribute to Wayne H. Gross, TAPPI President, Solutions!, January 2006, Vol. 89(1) (68 KB)
A Retirement Tribute to Wayne H. Gross, TAPPI President, Solutions!, January 2006, Vol. 89(1) (68 KB)
Magazine articles
The World Looks Just a Little Brighter in 2006, Solutions!, January 2006, Vol. 89(1) (38 KB)
The World Looks Just a Little Brighter in 2006, Solutions!, January 2006, Vol. 89(1) (38 KB)
Magazine articles
Are you in the MRO Parts Business or Pulp and Paper?, Solutions!, January 2006, Vol. 89(1) (104 KB)
Are you in the MRO Parts Business or Pulp and Paper?, Solutions!, January 2006, Vol. 89(1) (104 KB)