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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
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Open Access
Recent advances in lignin-based polyurethanes, TAPPI JOURNAL

Recent advances in lignin-based polyurethanes, TAPPI JOURNAL April 2017

Journal articles
Magazine articles
Open Access
Toward valorization of lignin: characterization and fast pyr

Toward valorization of lignin: characterization and fast pyrolysis of lignin recovered from hot-water extracts of electron-beam irradiated sugar maple, TAPPI JOURNAL April 2017

Journal articles
Magazine articles
Open Access
Guest Editorial: The next act for nonwovens, TAPPI JOURNAL A

Guest Editorial: The next act for nonwovens, TAPPI JOURNAL August 2017

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Open Access
Visual discrimination of hygiene tissue softness in the abse

Visual discrimination of hygiene tissue softness in the absence of haptic feedback, TAPPI JOURNAL August 2017

Journal articles
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Open Access
Modeling the influence of forming fabric structure on vacuum

Modeling the influence of forming fabric structure on vacuum box dewatering, TAPPI JOURNAL August 2017

Journal articles
Magazine articles
Open Access
Fractional pulping of packaging board in high consistency drum pulping, TAPPI JOURNAL February 2017

Fractional pulping of packaging board in high consistency drum pulping, TAPPI JOURNAL February 2017

Journal articles
Magazine articles
Open Access
Editorial: Planning for 2017 PEERS Conference: Maximizing success through innovation, TAPPI JOURNAL January 2017

Editorial: Planning for 2017 PEERS Conference: Maximizing success through innovation, TAPPI JOURNAL January 2017

Journal articles
Magazine articles
Open Access
Physical handsheet properties of pulp furnishes containing attritor-treated fibers, TAPPI JOURNAL January 2017

Physical handsheet properties of pulp furnishes containing attritor-treated fibers, TAPPI JOURNAL January 2017

Journal articles
Magazine articles
Open Access
Paper coated with sonochemically synthesized zinc oxide nanoparticles: Enhancement of properties for preservation of documents, TAPPI JOURNAL January 2017

Paper coated with sonochemically synthesized zinc oxide nanoparticles: Enhancement of properties for preservation of documents, TAPPI JOURNAL January 2017

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