Changes of chemical and mechanical behavior of torrefied wheat straw

Lei Shang; Jesper Ahrenfeldt; Jens Kai Holm; Anand Ramesh Sanadi; Søren Talbro Barsberg; Tobias Thomsen; Wolfgang Stelte; Ulrik Birk Henriksen

doi:10.1016/j.biombioe.2012.01.049

Changes of chemical and mechanical behavior of torrefied wheat straw

Lei Shang, Jesper Ahrenfeldt, Jens Kai Holm, Anand Ramesh Sanadi, Søren Talbro Barsberg, Tobias Thomsen, Wolfgang Stelte, Ulrik Birk Henriksen

110 Citationer (Scopus)

Abstract

The purpose of the study was to investigate the influence of torrefaction on the grindability of wheat straw. Straw samples were torrefied at temperatures between 200 °C and 300 °C and with residence times between 0.5 and 3 h. Spectroscopic information obtained from ATR-FTIR indicated that below 200 °C there was no obvious structural change of the wheat straw. At 200-250 °C hemicelluloses started to decompose and were totally degraded when torrefied at 300 °C for 2 h, while cellulose and lignin began to decompose at about 270-300 °C. Tensile failure strength and strain energy of oven dried wheat straw and torrefied wheat straw showed a clear reduction with increasing torrefaction temperature. In addition, Hardgrove Grindability Index (HGI) of wheat straw torrefied at different conditions was determined on a standard Hardgrove grinder. Both results showed an improvement of grindability in the torrefaction temperature range 250-300 °C, which can be well explained by the findings from FTIR analysis. At a torrefaction temperature of 260 °C and with a residence time of 2 h, wheat straw samples produced similar HGI values as coal (RUKUZN) with 0% moisture content. Under this condition, the Anhydrous Weight Loss (AWL%) of the wheat straw sample was 30% on dry and ash free basis (daf), and the higher heating value of the torrefied wheat straw was 24.2 MJ kg ^-1 (daf). The energy loss compared to the original material was 15% (daf).

Originalsprog	Engelsk
Tidsskrift	Biomass & Bioenergy
Vol/bind	40
Sider (fra-til)	63-70
Antal sider	8
ISSN	0961-9534
DOI	https://doi.org/10.1016/j.biombioe.2012.01.049
Status	Udgivet - maj 2012

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10.1016/j.biombioe.2012.01.049

http://www.sciencedirect.com/science/article/pii/S0961953412000712

Citationsformater

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title = "Changes of chemical and mechanical behavior of torrefied wheat straw",

abstract = "The purpose of the study was to investigate the influence of torrefaction on the grindability of wheat straw. Straw samples were torrefied at temperatures between 200 °C and 300 °C and with residence times between 0.5 and 3 h. Spectroscopic information obtained from ATR-FTIR indicated that below 200 °C there was no obvious structural change of the wheat straw. At 200-250 °C hemicelluloses started to decompose and were totally degraded when torrefied at 300 °C for 2 h, while cellulose and lignin began to decompose at about 270-300 °C. Tensile failure strength and strain energy of oven dried wheat straw and torrefied wheat straw showed a clear reduction with increasing torrefaction temperature. In addition, Hardgrove Grindability Index (HGI) of wheat straw torrefied at different conditions was determined on a standard Hardgrove grinder. Both results showed an improvement of grindability in the torrefaction temperature range 250-300 °C, which can be well explained by the findings from FTIR analysis. At a torrefaction temperature of 260 °C and with a residence time of 2 h, wheat straw samples produced similar HGI values as coal (RUKUZN) with 0% moisture content. Under this condition, the Anhydrous Weight Loss (AWL%) of the wheat straw sample was 30% on dry and ash free basis (daf), and the higher heating value of the torrefied wheat straw was 24.2 MJ kg -1 (daf). The energy loss compared to the original material was 15% (daf).",

author = "Lei Shang and Jesper Ahrenfeldt and Holm, {Jens Kai} and Sanadi, {Anand Ramesh} and Barsberg, {S{\o}ren Talbro} and Tobias Thomsen and Wolfgang Stelte and Henriksen, {Ulrik Birk}",

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TY - JOUR

T1 - Changes of chemical and mechanical behavior of torrefied wheat straw

AU - Shang, Lei

AU - Ahrenfeldt, Jesper

AU - Holm, Jens Kai

AU - Sanadi, Anand Ramesh

AU - Barsberg, Søren Talbro

AU - Thomsen, Tobias

AU - Stelte, Wolfgang

AU - Henriksen, Ulrik Birk

PY - 2012/5

Y1 - 2012/5

N2 - The purpose of the study was to investigate the influence of torrefaction on the grindability of wheat straw. Straw samples were torrefied at temperatures between 200 °C and 300 °C and with residence times between 0.5 and 3 h. Spectroscopic information obtained from ATR-FTIR indicated that below 200 °C there was no obvious structural change of the wheat straw. At 200-250 °C hemicelluloses started to decompose and were totally degraded when torrefied at 300 °C for 2 h, while cellulose and lignin began to decompose at about 270-300 °C. Tensile failure strength and strain energy of oven dried wheat straw and torrefied wheat straw showed a clear reduction with increasing torrefaction temperature. In addition, Hardgrove Grindability Index (HGI) of wheat straw torrefied at different conditions was determined on a standard Hardgrove grinder. Both results showed an improvement of grindability in the torrefaction temperature range 250-300 °C, which can be well explained by the findings from FTIR analysis. At a torrefaction temperature of 260 °C and with a residence time of 2 h, wheat straw samples produced similar HGI values as coal (RUKUZN) with 0% moisture content. Under this condition, the Anhydrous Weight Loss (AWL%) of the wheat straw sample was 30% on dry and ash free basis (daf), and the higher heating value of the torrefied wheat straw was 24.2 MJ kg -1 (daf). The energy loss compared to the original material was 15% (daf).

AB - The purpose of the study was to investigate the influence of torrefaction on the grindability of wheat straw. Straw samples were torrefied at temperatures between 200 °C and 300 °C and with residence times between 0.5 and 3 h. Spectroscopic information obtained from ATR-FTIR indicated that below 200 °C there was no obvious structural change of the wheat straw. At 200-250 °C hemicelluloses started to decompose and were totally degraded when torrefied at 300 °C for 2 h, while cellulose and lignin began to decompose at about 270-300 °C. Tensile failure strength and strain energy of oven dried wheat straw and torrefied wheat straw showed a clear reduction with increasing torrefaction temperature. In addition, Hardgrove Grindability Index (HGI) of wheat straw torrefied at different conditions was determined on a standard Hardgrove grinder. Both results showed an improvement of grindability in the torrefaction temperature range 250-300 °C, which can be well explained by the findings from FTIR analysis. At a torrefaction temperature of 260 °C and with a residence time of 2 h, wheat straw samples produced similar HGI values as coal (RUKUZN) with 0% moisture content. Under this condition, the Anhydrous Weight Loss (AWL%) of the wheat straw sample was 30% on dry and ash free basis (daf), and the higher heating value of the torrefied wheat straw was 24.2 MJ kg -1 (daf). The energy loss compared to the original material was 15% (daf).

U2 - 10.1016/j.biombioe.2012.01.049

DO - 10.1016/j.biombioe.2012.01.049

M3 - Journal article

SN - 0961-9534

VL - 40

SP - 63

EP - 70

JO - Biomass & Bioenergy

JF - Biomass & Bioenergy

ER -

Changes of chemical and mechanical behavior of torrefied wheat straw

Abstract

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