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Journal articles
TAPPI JOURNAL Summaries, Paper360° July/August 2010

TAPPI JOURNAL Summaries, Paper360º July/August 2010

Journal articles
Open Access
Improving anaerobic conversion of pulp mill secondary sludge to biogas by pretreatment, TAPPI JOURNAL June 2010

Improving anaerobic conversion of pulp mill secondary sludge to biogas by pretreatment, TAPPI JOURNAL June 2010

Journal articles
Focus on the Far East, Paper360° March/April 2010

Focus on the Far East, Paper360º March/April 2010

Journal articles
Using the Measurement of Colloidal Microstickies to Meet Industry Needs for Deposit Control â?¢ Part I: Recycle Plant, May 2010

Using the Measurement of Colloidal Microstickies to Meet Industry Needs for Deposit Control • Part I: Recycle Plant, May 2010

Journal articles
Open Access
Converted bleach sequence improves pulp quality, TAPPI JOURNAL, July 1990, Vol. 73(7)

Converted bleach sequence improves pulp quality, TAPPI JOURNAL, July 1990, Vol. 73(7)

Journal articles
Open Access
A new wet-end control system with on-line sensors, TAPPI JOURNAL, July 1990, Vol. 73(7)

A new wet-end control system with on-line sensors, TAPPI JOURNAL, July 1990, Vol. 73(7)

Journal articles
Open Access
Pulping of southern pine under low water, alkaline conditions using supercritical carbon dioxide-sulfur dioxide mixtures, TAPPI JOURNAL, July 1990, Vol. 73(7)

Pulping of southern pine under low water, alkaline conditions using supercritical carbon dioxide-sulfur dioxide mixtures, TAPPI JOURNAL, July 1990, Vol. 73(7)

Journal articles
Open Access
Hydrogen-peroxide-reinforced oxygen delignification of southern pine kraft pulp and short sequence bleaching, TAPPI JOURNAL, July 1990, Vol. 73(7)

Hydrogen-peroxide-reinforced oxygen delignification of southern pine kraft pulp and short sequence bleaching, TAPPI JOURNAL, July 1990, Vol. 73(7)

Journal articles
Magazine articles
TAPPI Journal Summaries, Paper360º September/October 2020

TAPPI Journal Summaries, Paper360º September/October 2020

Journal articles
Magazine articles
Open Access
Recovery boiler back-end heat recovery, TAPPI Journal March 2023

ABSTRACT: Sustainability and efficient use of resources are becoming increasingly important aspects in the operation of all industries. Recently, some biomass-fired boilers have been equipped with increasingly complex condensing back-end heat recovery solutions, sometimes also using heat pumps to upgrade the low-grade heat. In kraft recovery boilers, however, scrubbers are still mainly for gas cleaning, with only simple heat recovery solutions. In this paper, we use process simulation software to study the potential to improve the power generation and energy efficiency by applying condensing back-end heat recovery on a recovery boiler. Different configurations are considered, including heat pumps. Potential streams to serve as heat sinks are considered and evaluated. Lowering the recovery boiler flue gas temperature to approximately 65°C significantly decreases the flue gas losses. The heat can be recovered as hot water, which is used to partially replace low-pressure (LP) steam, making more steam available for the condensing steam turbine portion for increased power generation. The results indicate that in a simple condensing plant, some 1%•4% additional electricity could be generated. In a Nordic mill that provides district heating, even more additional electricity generation, up to 6%, could be achieved. Provided the availability of sufficient low-temperature heat sinks to use the recovered heat, as well as sufficient condensing turbine swallowing capacity to utilize the LP steam, the use of scrubbing and possibly upgrading the heat using heat pumps appears potentially useful.

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