Mechanical Properties of Corn Stover Grind

Le résumé fourni par la source

Mechanical properties of corn stover grinds are important because of the need foraccurate input data in the design of densification equipment and mathematical modeling ofdensification process per se. Mechanical properties of corn stover such as particle size distribution,bulk and particle densities, compressibility, particle stiffness, wall friction and adhesion on steelsurface were determined with two hammer mill screen sizes (3.18 and 6.35 mm) at three differentmoisture contents (7, 11, 15% (wb)). Mechanical properties such as compressibility, initial bulkmodulus, porosity index and particle stiffness were determined from a pressure-density data.Compressibility was varied between 476 and 375. Corn stover grinds at low moisture content wereeasily compressible than grinds at high moisture content. The particle stiffness and maximumcompact density were in the range of 14.4-9.7 kPa and 1120-1081 kg/m3, respectively. The initialbulk modulus and porosity index of corn stover grinds varied between 0.74-0.13 MPa and 0.77-0.55,respectively. The wall friction and adhesion coefficient of corn stover grind for a steel plate were inthe range between 0.26-0.17and 3.1-0.3, respectively at 7% moisture content. Moisture content, andgrind size had a significant effect on wall friction. A slight increase of wall friction was observed at lownormal pressure. An increase of wall friction was found with increase in moisture content.

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