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Pelleting torrefied biomass at pilot-scale – Quality and implications for co-firing

Agar, David and Rudolfsson, Magnus and Lavergne, Simon and Melkior, Thierry and Da Silva Perez, Denilson and Dupont, Capucine and Campargue, Matthieu and Kalen, Gunnar and Larsson, Sylvia (2021). Pelleting torrefied biomass at pilot-scale – Quality and implications for co-firing. Renewable Energy. 178 , 766-774
[Research article]

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Abstract

The co-firing of solid biofuels in coal plants is an attractive and fast-track means of cutting emissions but its potential is linked to biomass densification. For torrefied materials this topic is under-represented in literature. This pilot-scale (121–203 kg h−1) pelleting study generated detailed knowledge on the densification of torrefied biomass compared to untreated biomass. Four feedstock with high supply availability (beech, poplar, wheat straw and corn cob) were studied in their untreated and torrefied forms. Systematic methods were used to produce 180 batches of 8 mm dia. pellets using press channel length (PCL) and moisture content (MC) ranges of 30–60 mm and 7.3–16.6% (wet basis) respectively. Analysis showed that moderate degrees of torrefaction (250–280 °C, 20–75 min) strongly affected pelleting behaviour. The highest quality black pellets had a mechanical durability and bulk density range of 87.5–98.7% and 662–697 kg m−3 respectively. Pelleting energy using torrefied feedstock varied from −15 to +53 kWh t−1 from untreated with increases in production fines. Optimal pelleting MC and PCL were reduced significantly for torrefied feedstock and pellet quality was characterised by a decrease in mechanical durability and an increase in bulk density. Energy densities of 11.9–13.2 GJ m−3 (as received) were obtained.

Authors/Creators:Agar, David and Rudolfsson, Magnus and Lavergne, Simon and Melkior, Thierry and Da Silva Perez, Denilson and Dupont, Capucine and Campargue, Matthieu and Kalen, Gunnar and Larsson, Sylvia
Title:Pelleting torrefied biomass at pilot-scale – Quality and implications for co-firing
Series Name/Journal:Renewable Energy
Year of publishing :2021
Volume:178
Page range:766-774
Number of Pages:9
ISSN:0960-1481
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 204 Chemical Engineering > Chemical Process Engineering
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Renewable Bioenergy Research
Keywords:Torrefaction, Durability, Energy density, Densification, Pelletization, Bio-coal
URN:NBN:urn:nbn:se:slu:epsilon-p-112634
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-112634
Additional ID:
Type of IDID
DOI10.1016/j.renene.2021.06.094
ID Code:24788
Faculty:S - Faculty of Forest Sciences
Department:(S) > Department of Forest Biomaterials and Technology
Deposited By: SLUpub Connector
Deposited On:02 Jul 2021 13:25
Metadata Last Modified:02 Jul 2021 13:31

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