A study of bonding and failure mechanisms in fuel pellets from different biomass resources

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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A study of bonding and failure mechanisms in fuel pellets from different biomass resources. / Stelte, Wolfgang; Holm, Jens K.; Sanadi, Anand R.; Barsberg, Søren; Ahrenfeldt, Jesper; Henriksen, Ulrik Birk.

In: Biomass & Bioenergy, Vol. 35, No. 2, 2011, p. 910-918.

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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Stelte, Wolfgang; Holm, Jens K.; Sanadi, Anand R.; Barsberg, Søren; Ahrenfeldt, Jesper; Henriksen, Ulrik Birk / A study of bonding and failure mechanisms in fuel pellets from different biomass resources.

In: Biomass & Bioenergy, Vol. 35, No. 2, 2011, p. 910-918.

Publication: Research - peer-reviewJournal article – Annual report year: 2010

Bibtex

@article{22877dd8ee654d2d9af8aa87939e2ae9,
title = "A study of bonding and failure mechanisms in fuel pellets from different biomass resources",
keywords = "Bio systems, Thermal gasification of biomass, Biosystemer, Termisk forgasning af biomasse",
publisher = "Pergamon",
author = "Wolfgang Stelte and Holm, {Jens K.} and Sanadi, {Anand R.} and Søren Barsberg and Jesper Ahrenfeldt and Henriksen, {Ulrik Birk}",
year = "2011",
doi = "10.1016/j.biombioe.2010.11.003",
volume = "35",
number = "2",
pages = "910--918",
journal = "Biomass & Bioenergy",
issn = "0961-9534",

}

RIS

TY - JOUR

T1 - A study of bonding and failure mechanisms in fuel pellets from different biomass resources

A1 - Stelte,Wolfgang

A1 - Holm,Jens K.

A1 - Sanadi,Anand R.

A1 - Barsberg,Søren

A1 - Ahrenfeldt,Jesper

A1 - Henriksen,Ulrik Birk

AU - Stelte,Wolfgang

AU - Holm,Jens K.

AU - Sanadi,Anand R.

AU - Barsberg,Søren

AU - Ahrenfeldt,Jesper

AU - Henriksen,Ulrik Birk

PB - Pergamon

PY - 2011

Y1 - 2011

N2 - Pelletization of biomass reduces its handling costs, and results in a fuel with a greater structural homogeneity. The aim of the present work was to study the strength and integrity of pellets and relate them to the quality and mechanisms of inter-particular adhesion bonding. The raw materials used were: beech, spruce and straw, representing the most common biomass types used for fuel pellet production, i.e. hardwoods, softwoods and grasses, respectively. The results showed that the compression strengths of the pellets were in general higher for pellets produced at higher temperatures, and much higher for wood pellets than for straw pellets. Scanning electron microscopy of the beech pellets fracture surfaces, pressed at higher temperatures, showed areas of cohesive failure, indicating high energy failure mechanisms, likely due to lignin flow and inter-diffusion between adjacent wood particles. These were absent in both spruce and straw pellets. Infrared spectroscopy of the fracture surfaces of the straw pellets indicated high concentrations of hydrophobic extractives, that were most likely responsible for their low compression strength, due to presence of a chemical weak boundary layer, limiting the adhesion mechanism to van der Waals forces. Electron micrographs indicating interfacial failure mechanisms support these findings. Infrared spectra of the fracture surface of wood pellets, pressed at elevated temperatures, showed no signs of hydrophobic extractives. It has been shown that both temperature and chemical composition, i.e. the presence of hydrophobic extractives, have a significant influence on the bonding quality between biomass particles during the pelletizing process.

AB - Pelletization of biomass reduces its handling costs, and results in a fuel with a greater structural homogeneity. The aim of the present work was to study the strength and integrity of pellets and relate them to the quality and mechanisms of inter-particular adhesion bonding. The raw materials used were: beech, spruce and straw, representing the most common biomass types used for fuel pellet production, i.e. hardwoods, softwoods and grasses, respectively. The results showed that the compression strengths of the pellets were in general higher for pellets produced at higher temperatures, and much higher for wood pellets than for straw pellets. Scanning electron microscopy of the beech pellets fracture surfaces, pressed at higher temperatures, showed areas of cohesive failure, indicating high energy failure mechanisms, likely due to lignin flow and inter-diffusion between adjacent wood particles. These were absent in both spruce and straw pellets. Infrared spectroscopy of the fracture surfaces of the straw pellets indicated high concentrations of hydrophobic extractives, that were most likely responsible for their low compression strength, due to presence of a chemical weak boundary layer, limiting the adhesion mechanism to van der Waals forces. Electron micrographs indicating interfacial failure mechanisms support these findings. Infrared spectra of the fracture surface of wood pellets, pressed at elevated temperatures, showed no signs of hydrophobic extractives. It has been shown that both temperature and chemical composition, i.e. the presence of hydrophobic extractives, have a significant influence on the bonding quality between biomass particles during the pelletizing process.

KW - Bio systems

KW - Thermal gasification of biomass

KW - Biosystemer

KW - Termisk forgasning af biomasse

U2 - 10.1016/j.biombioe.2010.11.003

DO - 10.1016/j.biombioe.2010.11.003

JO - Biomass & Bioenergy

JF - Biomass & Bioenergy

SN - 0961-9534

IS - 2

VL - 35

SP - 910

EP - 918

ER -