Review of Biomass Size Reduction Technology

Yu, Manlu; Womac, A. R.; Pordesimo, L. O.

doi:10.13031/2013.15454

Cited by 10 publications

(1 citation statement)

References 20 publications

(20 reference statements)

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“…While hammermill performance is dependent on the initial particle size, moisture content, material properties, feed rate, and machine variables (Mani et al, 2004a;Manlu et al, 2003), the most important property is the moisture content of the feed material. Since yellow dent shelled corn at 15% moisture content (wet basis) is the grain that is typically used by the dry grind ethanol industry, the machine variables of the hammermill are usually set to maximize performance at this level of moisture.…”

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The Effect of Moisture Content on the Grinding Performance of Corn and Corncobs by Hammermilling

2013

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ABSTRACT. The grinding behavior of corn and corncobs was investigated at moisture content levels of 10. 39%, 16.02%, and 19.64% (wet basis) for shelled corn and 10.04%, 14.65%, and 20.13% (wet basis) for corncobs. Grinding performance was assessed by determining the throughput, specific rate of breakage, particle size distribution, power consumption, and energy required for grinding using a hammermill. The physical and flow properties investigated were loose and tapped bulk density, compressibility index, Hausner ratio, particle density, and static angle of repose. The throughput and specific rate of breakage of corncobs were very low compared to corn and decreased with increasing moisture content. The energy required for grinding corncobs was higher than that for corn. The particle size of ground corn was smaller than that of ground cobs; however, there were no significant differences across moisture levels. The particle size distribution of ground corn was narrower than that of ground cobs. Physical and flow properties were not significantly different across moisture levels for both ground corn and cobs. The smaller size of the corn particles explains why the bulk density, compressibility index, Hausner ratio, and angle of repose were higher for ground corn than for ground cobs.

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The Effect of Moisture Content on the Grinding Performance of Corn and Corncobs by Hammermilling

2013

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Physicomechanical properties of raw and comminuted pine and poplar shavings: energy consumption, particle size distribution and flow properties

et al. 2023

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The aim of this study was to assess the energy consumption during milling and cutting-milling of pine and poplar shavings and the determination of particle size distribution (PSD) characteristics and mechanical properties of these materials. Cutting-milling process required less energy (in kJ·kg–1) than milling but maximum mass flow rate of shavings was significantly higher and thus the effective power requirement of the knife mill during cutting also was higher. Comminution of plastic poplar shavings was more energy-consuming than harder pine shavings. These features influenced PSD, which was approximated with four mathematical models: Rosin–Rammler-Sperling-Bennett (RRSB), normal, logistic and lognormal. On the basis of the best fitting (Radj2) for RRSB, detailed PSD parameters were calculated and all PSDs were described as ‘mesokurtic’, ‘fine skewed’ and ‘well-graded’. In comparison to milled shavings, cut-milled shavings had higher density, but were less compressible and had lower unconfined yield strength. However, cut-milled shavings had higher flowability because of lower cohesion and internal friction angles, because after cutting-milling particles were more spherical than elongated particles after milling. Cut-milled poplar shavings had more favourable mechanical parameters and better PSD characteristics, but required more energy for comminution than pine shavings.

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