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Assessing Energy Pathways for Forestry Residue Utilization

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Bioenergy Engineering, 11-14 October 2009, Bellevue, Washington  BIO-097950.(doi:10.13031/2013.28866)
Authors:   Peter G Dempster, Bruce Hartsough, Bryan Jenkins, Ruihong Zhang
Keywords:   Bioenergy, gasification, pelleting, fast pyrolysis, economics, forestry residues

Technical and economic assessment of fast pyrolysis, gasification and pelleting systems were performed. Required components were determined for each technology. These included pretreatment and primary conversion equipment, intermediate product and final product recovery systems, and in some cases secondary conversion equipment. Capital, operating and maintenance costs were obtained directly from manufacturers or from literature related to engineering economic assessments of similar technologies. A spreadsheet model was developed to determine required revenue, in US (2007) dollars, for each final product (electricity, bio-oil or pellets). Sensitivity of product cost to feedstock cost and plant availability was determined. Options were compared based on production cost per dry tonne of chips converted over a range of feedstock throughputs, given zero feedstock cost.

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