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Grinding performance and physical properties of wheat and barley straws, corn stover and switchgrass

Authors
Journal
Biomass and Bioenergy
0961-9534
Publisher
Elsevier
Publication Date
Volume
27
Issue
4
Identifiers
DOI: 10.1016/j.biombioe.2004.03.007
Keywords
  • Size Reduction
  • Comminution
  • Agricultural Crop Residues
  • Energy Crops
  • Specific Energy Consumption
Disciplines
  • Mathematics

Abstract

Abstract Wheat and barley straws, corn stover and switchgrass at two moisture contents were ground using a hammer mill with three different screen sizes (3.2, 1.6 and 0.8 mm ). Energy required for grinding these materials was measured. Among the four materials, switchgrass had the highest specific energy consumption ( 27.6 kW h t −1 ), and corn stover had the least specific energy consumption ( 11.0 kW h t −1 ) at 3.2 mm screen size. Physical properties of grinds such as moisture content, geometric mean diameter of grind particles, particle size distribution, and bulk and particle densities were determined. Second- or third-order polynomial models were developed relating bulk and particle densities of grinds to geometric mean diameter within the range of 0.18– 1.43 mm . Switchgrass had the highest calorific value and the lowest ash content among the biomass species tested.

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