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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
Open Access
Revised steady-state model for chlorine dioxide brightening

Revised steady-state model for chlorine dioxide brightening that considers extraction washer carryover effects, TAPPI JOURNAL March 2016

Journal articles
Magazine articles
Open Access
Understanding the risks and rewards of using 50% vs. 10% strength peroxide in pulp bleach plants, TAPPI Journal November 2018

Authors: Alan W. Rudie and Peter W. Hart | ABSTRACT: The use of 50% concentration and 10% concentration hydrogen peroxide were evaluated for chemical and mechanical pulp bleach plants at storage and at point of use. Several dangerous occurrences have been documented when the supply of 50% peroxide going into the pulping process was not stopped during a process failure. Startup conditions and leaking block valves during maintenance outages have also contributed to explosions. Although hazardous events have occurred, 50% peroxide can be stored safely with proper precautions and engineering controls. For point of use in a chemical bleach plant, it is recommended to dilute the peroxide to 10% prior to application, because risk does not outweigh the benefit. For point of use in a mechanical bleach plant, it is recommended to use 50% peroxide going into a bleach liquor mixing system that includes the other chemicals used to maintain the brightening reaction rate. When 50% peroxide is used, it is critical that proper engineering controls are used to mitigate any risks.

Journal articles
Magazine articles
Open Access
Using multistage models to evaluate how pulp washing after the first extraction stage impacts elemental chlorine-free bleach demand, TAPPI Journal November 2018

Using multistage models to evaluate how pulp washing after the first extraction stage impacts elemental chlorine-free bleach demand, TAPPI Journal November 2018

Journal articles
Magazine articles
Open Access
Impact of dissolved matter in the oxygen delignifcation stag

Impact of dissolved matter in the oxygen delignifcation stage, TAPPI JOURNAL May 2017

Journal articles
Open Access
Alkali impregnation of hardwood chips, TAPPI JOURNAL & Solutions! February 2005, Vol. 4(2) (215KB)

Alkali impregnation of hardwood chips, TAPPI JOURNAL & Solutions! February 2005, Vol. 4(2) (215KB)

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
Effects of calcium on peroxide bleaching and washing of ther

Effects of calcium on peroxide bleaching and washing of thermomechanical pulp, TAPPI JOURNAL, October 2006

Journal articles
Open Access
Factors contributing to improved environmental performance in the Finnish kraft pulping industry, TAPPI JOURNAL, September 2007

Factors contributing to improved environmental performance in the Finnish kraft pulping industry, TAPPI JOURNAL, September 2007

Journal articles
Open Access
Heat integration opportunities in an average Scandinavian fine paper mill: Model study and comparison with a market pulp mill, TAPPI JOURNAL February 2008

Heat integration opportunities in an average Scandinavian fine paper mill: Model study and comparison with a market pulp mill, TAPPI JOURNAL February 2008

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