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Knife mill operating factors effect on switchgrass particle size distributions.

Venkata S P Bitra1, Alvin R Womac, Yuechuan T Yang

  • 1Department of Biosystems Engineering and Soil Science, 2506 E.J. Chapman Drive, The University of Tennessee, Knoxville, TN 37996, USA.

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Knife mill screen size is the primary factor controlling switchgrass particle size, with feed rate also influencing the distribution. This research guides optimal biomass processing for handling and conversion.

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Area of Science:

  • Agricultural Engineering
  • Biomass Processing
  • Particle Science

Background:

  • Biomass particle size is critical for efficient handling, storage, conversion, and dust control.
  • Understanding switchgrass particle size distribution is essential for optimizing its use as a biofuel feedstock.

Purpose of the Study:

  • To determine switchgrass particle size distributions produced by a knife mill.
  • To analyze the influence of mill operating parameters (screen size, speed, feed rate) on particle size.
  • To mathematically describe the particle size distributions using analytical descriptors.

Main Methods:

  • Switchgrass was processed using a knife mill with varying screen sizes (12.7-50.8 mm), speeds (250-500 rpm), and feed rates (2-11 kg/min).
  • Particle size distributions were analyzed using standardized sieves and horizontal sieving motion.
  • Analytical descriptors, including geometric mean length, Rosin-Rammler function, mass relative span, and uniformity coefficient, were employed.

Main Results:

  • Knife mill screen size was the dominant factor affecting switchgrass particle size (correlation coefficient of 0.872 for geometric mean length).
  • Feed rate showed a lesser, unexpected influence on particle size (correlation coefficient of 0.349).
  • The Rosin-Rammler function accurately modeled the size distribution (R(2)>0.982), indicating a wide and well-graded assortment of particles.

Conclusions:

  • Knife mill screen size is the most critical parameter for controlling switchgrass chop size.
  • The study provides a quantitative understanding of biomass particle size distributions and their relationship to processing parameters.
  • Results can guide the selection of knife mill operating parameters to achieve desired switchgrass particle sizes for various applications.