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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
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
PET Recyclable Polymer for Making Paper Washbowls, TAPPI JOURNAL May 2008
PET Recyclable Polymer for Making Paper Washbowls, TAPPI JOURNAL May 2008
Magazine articles
A personal mount st. helens experience, TAPPI JOURNAL, May 2000, Vol. 83(5)
A personal mount st. helens experience, TAPPI JOURNAL, May 2000, Vol. 83(5)
Journal articles
Magazine articles
Ultrastructural Behavior of Cell Wall Polysaxxharides, TAPPI Journal April 2022
ABSTRACT: Considerable information on the ultrastructural organization of the plant cell wall and the supermolecular arragement of the cell wall components, in particular of cellulose, has been obtained with the electron microscope.
Journal articles
Magazine articles
Incorporation of post-consumer pizza boxes in the recovered fiber stream: Impacts of grease on finished product quality, TAPPI Journal March 2021
ABSTRACT: Grease and cheese contamination of used pizza boxes has led to misunderstanding and controversy about the recyclability of pizza boxes. Some collection facilities accept pizza boxes while others do not. The purpose of this study is to determine whether typical grease or cheese contamination levels associated with pizza boxes impact finished product quality. Grease (from vegetable oil) and cheese are essentially hydrophobic and in sufficiently high concentration could interfere with interfiber bonding, resulting in paper strength loss.Findings from this study will be used to determine the viability of recycling pizza boxes at current and future con-centrations in old corrugated containers (OCC) recovered fiber streams. These findings will also be used to inform the acceptability of pizza boxes in the recycle stream and educate consumers about acceptable levels of grease or cheese residue found on these recycled boxes.
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
Accurate determination of six common fillers in fine papers, newsprint, and recycled stock by x-ray fluorescence spectrometry, TAPPI JOURNAL, April 1995, Vol. 78(4)
Accurate determination of six common fillers in fine papers, newsprint, and recycled stock by x-ray fluorescence spectrometry, TAPPI JOURNAL, April 1995, Vol. 78(4)
Journal articles
Fiber fractionation as a method of improving handsheet properties after repeated recycling, TAPPI JOURNAL, May 1995, Vol. 78(5)
Fiber fractionation as a method of improving handsheet properties after repeated recycling, TAPPI JOURNAL, May 1995, Vol. 78(5)
Journal articles
Photoyellowing of mechanical pulps - part 2: activation spectra for light-induced yellowing of newsprint paper by polychromatic radiation, TAPPI JOURNAL, May 1995, Vol. 78(5)
Photoyellowing of mechanical pulps - part 2: activation spectra for light-induced yellowing of newsprint paper by polychromatic radiation, TAPPI JOURNAL, May 1995, Vol. 78(5)
