Efficient Fuel Pretreatment: Simultaneous Torrefaction and Grinding of Biomass

Combining torrefaction and grinding of biomass in one reactor may be an attractive fuel pretreatment process. A combined laboratory torrefaction and ball mill reactor has been constructed for studies of the influence of temperature and residence time on the product yields and particle size reductio...

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Main Authors:	Suriyati, Saleh, Hansen, Brian Brun, Jensen, Peter Arendt, Dam-Johansen, Kim
Format:	Article
Language:	English
Published:	American Chemical Society 2013
Subjects:	TP Chemical technology
Online Access:	http://umpir.ump.edu.my/id/eprint/6486/ http://umpir.ump.edu.my/id/eprint/6486/ http://umpir.ump.edu.my/id/eprint/6486/ http://umpir.ump.edu.my/id/eprint/6486/1/Efficient%20Fuel%20Pretreatment-%20Simultaneous%20Torrefaction%20and%20Grinding%20of%20Biomass.pdf

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spelling	ump-64862018-05-21T06:45:00Z http://umpir.ump.edu.my/id/eprint/6486/ Efficient Fuel Pretreatment: Simultaneous Torrefaction and Grinding of Biomass Suriyati, Saleh Hansen, Brian Brun Jensen, Peter Arendt Dam-Johansen, Kim TP Chemical technology Combining torrefaction and grinding of biomass in one reactor may be an attractive fuel pretreatment process. A combined laboratory torrefaction and ball mill reactor has been constructed for studies of the influence of temperature and residence time on the product yields and particle size reductions of Danish wheat straw, spruce chips, and pine chips. On the basis of initial experiments, which evaluated the influence of reactor mass loading, gas flow, and grinding ball size and material, a standard experimental procedure was developed. The particle size reduction capability of the torrefaction process has been evaluated by the relative change in d50, and this method was compared to the Hardgrove grindability index (HGI), showing reasonably similar results. Significant differences in torrefaction behavior have been observed for straw and spruce chips torrefied at 270−330 °C. Torrefaction of straw for 90 min yielded a higher mass loss (27−60 wt %) and relative size reduction (59−95%)compared with spruce (mass loss of 10−56 wt % and size reduction of 20−60%). The two types of biomass investigated differ with respect to hemicellulose type, lignocellulosic composition, particle morphology, and ash composition, where straw has a higher alkali content. This and other studies indicate that the large difference in the alkali contents of the biomasses is the main cause for the observed difference in torrefaction characteristics. Experiments with separate particle heating and grinding showed a swift grinding of the torrefied biomass. This implies that the rate-limiting step in the laboratory reactor is the heat transfer and not the grinding process. Large pine particles (8−16 mm) showed a slightly higher mass loss than 4−8 and <4 mm particles. This could be the consequence of exothermic reactions in the particle core, which locally increase the temperature and conversion. American Chemical Society 2013 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/6486/1/Efficient%20Fuel%20Pretreatment-%20Simultaneous%20Torrefaction%20and%20Grinding%20of%20Biomass.pdf Suriyati, Saleh and Hansen, Brian Brun and Jensen, Peter Arendt and Dam-Johansen, Kim (2013) Efficient Fuel Pretreatment: Simultaneous Torrefaction and Grinding of Biomass. Energy and Fuels, 27 (12). pp. 7531-7540. ISSN 0887-0624 (Print); 1520-5029 (Online) http://dx.doi.org/10.1021/ef401787q DOI: 10.1021/ef401787q
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Suriyati, Saleh Hansen, Brian Brun Jensen, Peter Arendt Dam-Johansen, Kim Efficient Fuel Pretreatment: Simultaneous Torrefaction and Grinding of Biomass
description	Combining torrefaction and grinding of biomass in one reactor may be an attractive fuel pretreatment process. A combined laboratory torrefaction and ball mill reactor has been constructed for studies of the influence of temperature and residence time on the product yields and particle size reductions of Danish wheat straw, spruce chips, and pine chips. On the basis of initial experiments, which evaluated the influence of reactor mass loading, gas flow, and grinding ball size and material, a standard experimental procedure was developed. The particle size reduction capability of the torrefaction process has been evaluated by the relative change in d50, and this method was compared to the Hardgrove grindability index (HGI), showing reasonably similar results. Significant differences in torrefaction behavior have been observed for straw and spruce chips torrefied at 270−330 °C. Torrefaction of straw for 90 min yielded a higher mass loss (27−60 wt %) and relative size reduction (59−95%)compared with spruce (mass loss of 10−56 wt % and size reduction of 20−60%). The two types of biomass investigated differ with respect to hemicellulose type, lignocellulosic composition, particle morphology, and ash composition, where straw has a higher alkali content. This and other studies indicate that the large difference in the alkali contents of the biomasses is the main cause for the observed difference in torrefaction characteristics. Experiments with separate particle heating and grinding showed a swift grinding of the torrefied biomass. This implies that the rate-limiting step in the laboratory reactor is the heat transfer and not the grinding process. Large pine particles (8−16 mm) showed a slightly higher mass loss than 4−8 and <4 mm particles. This could be the consequence of exothermic reactions in the particle core, which locally increase the temperature and conversion.
format	Article
author	Suriyati, Saleh Hansen, Brian Brun Jensen, Peter Arendt Dam-Johansen, Kim
author_facet	Suriyati, Saleh Hansen, Brian Brun Jensen, Peter Arendt Dam-Johansen, Kim
author_sort	Suriyati, Saleh
title	Efficient Fuel Pretreatment: Simultaneous Torrefaction and Grinding of Biomass
title_short	Efficient Fuel Pretreatment: Simultaneous Torrefaction and Grinding of Biomass
title_full	Efficient Fuel Pretreatment: Simultaneous Torrefaction and Grinding of Biomass
title_fullStr	Efficient Fuel Pretreatment: Simultaneous Torrefaction and Grinding of Biomass
title_full_unstemmed	Efficient Fuel Pretreatment: Simultaneous Torrefaction and Grinding of Biomass
title_sort	efficient fuel pretreatment: simultaneous torrefaction and grinding of biomass
publisher	American Chemical Society
publishDate	2013
url	http://umpir.ump.edu.my/id/eprint/6486/ http://umpir.ump.edu.my/id/eprint/6486/ http://umpir.ump.edu.my/id/eprint/6486/ http://umpir.ump.edu.my/id/eprint/6486/1/Efficient%20Fuel%20Pretreatment-%20Simultaneous%20Torrefaction%20and%20Grinding%20of%20Biomass.pdf
first_indexed	2023-09-18T22:02:16Z
last_indexed	2023-09-18T22:02:16Z
_version_	1777414476846333952

Efficient Fuel Pretreatment: Simultaneous Torrefaction and Grinding of Biomass

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