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Design and Use of a Flailing Knife Biomass Shredder to Mechanically Increase Particle Surface Area

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

Citation:  Paper number  131620254,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Shawn G Ehlers, Dennis R Buckmaster, Daniel R Ess, Keith D Johnson
Keywords:   Biomass Energy Flail Shred Surface area Hammermill Particle size Processing Ion conductivity Fiber

Abstract. A flailing knife shredder was designed and tested as an alternative to a hammermill for processing biomass. Energy usage, output characteristics and device capacities were compared with corn stover processed at moisture content (MC) of 10%, 35% and 50% wet basis. The hammermill produced a more uniform particle size distribution and with higher accessibility to plant constituents as indicated by conductivity index; however, the flailing knife shredder processed higher moisture content material at a much higher processing rate. The specific energy consumption was 3.75 kWh/Mg with the flailing knife shredder and much higher at 16 kWh/Mg for the hammermill both processing biomass at 50% moisture content (wet basis).

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