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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
Lignin functionalization and the alkaline delignification rate, TAPPI JOURNAL, May 1992, Vol. 75(5)
Lignin functionalization and the alkaline delignification rate, TAPPI JOURNAL, May 1992, Vol. 75(5)
Journal articles
Heavy metal analysis of inks: a survey, TAPPI JOURNAL, April 1992, Vol. 75(4)
Heavy metal analysis of inks: a survey, TAPPI JOURNAL, April 1992, Vol. 75(4)
Journal articles
Shortwood vs. longwood chipping: what impact on chip distribution?, TAPPI JOURNAL, June 1992, Vol. 75(6)
Shortwood vs. longwood chipping: what impact on chip distribution?, TAPPI JOURNAL, June 1992, Vol. 75(6)
Journal articles
Effects of softwood morphology and chip thickness on pulping with a displacement kraft batch process, TAPPI JOURNAL, July 1998, Vol. 81(7)
Effects of softwood morphology and chip thickness on pulping with a displacement kraft batch process, TAPPI JOURNAL, July 1998, Vol. 81(7)
Journal articles
Biofiltration of a-pinene and its application to the treatment of pulp and paper air emissions, TAPPI JOURNAL, August 1998, Vol. 81(8)
Biofiltration of a-pinene and its application to the treatment of pulp and paper air emissions, TAPPI JOURNAL, August 1998, Vol. 81(8)
Journal articles
It's a dirty job, TAPPI JOURNAL, August 1996, Vol.79(8)
It's a dirty job, TAPPI JOURNAL, August 1996, Vol.79(8)
Journal articles
Public perceptions of the pulp and paper industry, TAPPI JOURNAL, October 1996, Vol. 79(10)
Public perceptions of the pulp and paper industry, TAPPI JOURNAL, October 1996, Vol. 79(10)
Journal articles
Strategies for preventive maintenance in a modern pulp and paper mill, TAPPI JOURNAL, June 1991, Vol. 74(6)
Strategies for preventive maintenance in a modern pulp and paper mill, TAPPI JOURNAL, June 1991, Vol. 74(6)
Journal articles
Direct biological bleaching of hardwood kraft pulp with the fungus Coriolus versicolor, TAPPI JOURNAL May 1989
Direct biological bleaching of hardwood kraft pulp with the fungus Coriolus versicolor, TAPPI JOURNAL May 1989