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Fuel pellet production from reed canary grass

supply potentials and process technology

Larsson, Sylvia (2008). Fuel pellet production from reed canary grass. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2008:65
ISBN 978-91-85913-98-5
[Doctoral thesis]

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This thesis focuses on two main areas: methods for assessing regional supply potentials of reed canary grass (Phalaris arundinacea L.) (RCG); and process technology for the production of high-quality RCG pellets. Partial equilibrium modelling, incorporating a break-even price approach, was used to examine supply potentials for RCG in Västerbotten County, northern Sweden. A remote sensing method, using black and white orthophoto interpretation, was developed, by which abandoned fields with low preparation costs (on average 173 SEK (ha)-1) could be distinguished from fields with high preparation costs (on average 3990 SEK (ha)-1). Based on the assumptions made, RCG production would predominantly be viable in the coastal area of Västerbotten County, and production equal to 1.3 TWh could be supplied at a farmgate fuel price of 116 SEK MW-1h-1. Pelletizing RCG allows it to be transported, stored and handled more easily. To determine the optimum conditions for RCG pelletizing, experiments were performed in an experimental design incorporating the factors: moisture content, steam addition, raw material density, and die temperature. Pre-compaction of the raw material was an efficient method for avoiding uneven pellet production. Through multiple response optimization, process settings were identified for the production of RCG pellets with a bulk density ≥ 650 kg m-3 and a durability ≥ 97.5%. To clarify the underlying mechanisms in the pelletizing process, the influences of moisture content and normal stress on the kinematic wall friction properties of RCG powder were studied. A steep increase in the kinematic wall friction with increasing normal stress was found in the normal stress interval 50-150 MPa. Multiple linear regression modelling of kinematic wall friction measurements at high normal stresses (65 to 376 MPa) revealed a local maximum at moisture contents of 13–16% and normal stresses of 150–225 MPa. Kinematic wall friction and pellet durability maxima occurred in overlapping moisture content ranges; it was, therefore, hypothesised that the two properties were correlated.

Authors/Creators:Larsson, Sylvia
Title:Fuel pellet production from reed canary grass
Subtitle:supply potentials and process technology
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2008
Number of Pages:53
ALLI. Larsson, S. & Nilsson, C. (2005). A remote sensing methodology to assess the costs of preparing abandoned farmland for energy crop cultivation in northern Sweden. Biomass and Bioenergy 28(1), 1-6. II. Larsson, S. (2006). Supply curves of reed canary grass (Phalaris arundinacea L.) in Västerbotten County, northern Sweden, under different EU subsidy schemes. Biomass and Bioenergy 30(1), 28-37. III. Larsson, S.H., Thyrel, M., Geladi, P. & Lestander, T.A. (2008). High quality biofuel pellet production from pre-compacted low density raw materials. Bioresource Technology 99(15), 7176-7182. IV. Larsson, S.H. Kinematic wall friction properties of reed canary grass powder at high and low normal stresses. (submitted)
Place of Publication:Umeå
ISBN for printed version:978-91-85913-98-5
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:phalaris arundinacea, fuel crops, biofuels, supply, supply functions, farmland, abandoned land, land use, geographical information systems, pellets, pelleting, density, moisture content, friction, sweden
Keywords:Phalaris arundinacea, energy crop, bioenergy, abandoned farmland, GIS, durability, bulk density, moisture content, friction
Permanent URL:
ID Code:1786
Department:(NL, NJ) > Unit of Biomass Technology and Chemistry (t.o.m. 121231)
Deposited By: Sylvia Larsson
Deposited On:10 Sep 2008 00:00
Metadata Last Modified:02 Dec 2014 10:14

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