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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Abstract
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 | ||||
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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: | 2008:65 | ||||
Number of Pages: | 53 | ||||
Papers/manuscripts: |
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Place of Publication: | Umeå | ||||
ISBN for printed version: | 978-91-85913-98-5 | ||||
ISSN: | 1652-6880 | ||||
Language: | English | ||||
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 | ||||
URN:NBN: | urn:nbn:se:slu:epsilon-2500 | ||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-2500 | ||||
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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