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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.

Journal articles
Open Access
Development of Predictive Oxygen Delignification Models Usin

Development of Predictive Oxygen Delignification Models Using Kinetic Expressions and Neural Networks, TAPPI JOURNAL, May 2006, Vol. 5(5) (151 KB)

Journal articles
Open Access
Canadian industry: 1996 review, TAPPI JOURNAL, January 1997, Vol. 80(1)

Canadian industry: 1996 review, TAPPI JOURNAL, January 1997, Vol. 80(1)

Journal articles
Open Access
System control, monitoring and piping considerations for automated grease system, TAPPI JOURNAL, February 1997, Vol. 80(2)

System control, monitoring and piping considerations for automated grease system, TAPPI JOURNAL, February 1997, Vol. 80(2)

Journal articles
Open Access
Outsourcing providers, TAPPI JOURNAL, February 1997, Vol. 80(2)

Outsourcing providers, TAPPI JOURNAL, February 1997, Vol. 80(2)

Journal articles
Open Access
Calcium in pulping and bleaching, TAPPI JOURNAL, December 2000, Vol. 83(12)

Calcium in pulping and bleaching, TAPPI JOURNAL, December 2000, Vol. 83(12)

Journal articles
Open Access
Biocides-bug killers that enhance pulpmaking and papermaking processes, TAPPI JOURNAL, July 1996, Vol. 79(7)

Biocides-bug killers that enhance pulpmaking and papermaking processes, TAPPI JOURNAL, July 1996, Vol. 79(7)

Journal articles
Open Access
Conference review: Recycling sessions at TAPPI PEERS, TAPPI JOURNAL February 2012

Conference review: Recycling sessions at TAPPI PEERS, TAPPI JOURNAL February 2012

Journal articles
Open Access
Effect of Eucalyptus Globulus Wood Density on Papermaking Potential, TAPPI JOURNAL May 2008

Effect of Eucalyptus Globulus Wood Density on Papermaking Potential, TAPPI JOURNAL May 2008

Journal articles
Open Access
An Improved method for analyzing resin acid in wood, pulp, process water, and effluent samples, TAPPI JOURNAL, April 2000, Vol. 83(4)

An Improved method for analyzing resin acid in wood, pulp, process water, and effluent samples, TAPPI JOURNAL, April 2000, Vol. 83(4)

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