After grinding, the moisture contents of the ground
feedstock and fines were measured. It was noted that the
magnitude of moisture loss was greater for higher-moisture
feedstock materials (table 1). During grinding, a significant
amount of heat was generated in the grinding chamber due
to particle-particle and particle-hammer friction during size
reduction. The moisture loss from the feedstock material
can be attributed to this heating during the grinding
process, as well as the increase in surface area of the
broken particles, which facilitated drying.
A comparison
was done across each feedstock to determine whether there
was a significant change in moisture content of the ground
material. For corn, the moisture loss was significant for
initial moisture contents of 16.02% and 19.64% (p < 0.05).
The moisture loss due to grinding was higher for corncobs
than for corn kernels and was significant at all moisture
levels. This could be due to more heat generated by friction
during grinding of the harder corncobs compared with the
softer corn kernels. The components of the cobs are made
up of polysaccharides, including mainly cellulose, hemicellulose,
and lignin, which form rigid structures that are
often more difficult to break down (Kaliyan and Morey,
2008). In particular, the hard rind at the center of the cob
accounts for approximately 60% of the cob composition.
Although there were differences in the moisture of ground
material across different initial moisture contents, the fines
collected had no statistically significant differences in
moisture. This moisture loss trend underlies the importance
of including moisture loss in the mass balance calculations
for a size-reduction process. In an industrial-scale process,
the weight loss of the feedstock material can significantly
change the grinding output due to the high levels of heat
generated in a continuous grinding operation and should be
taken into account when sizing equipment during the
design process.
After grinding, the moisture contents of the ground feedstock and fines were measured. It was noted that themagnitude of moisture loss was greater for higher-moisturefeedstock materials (table 1). During grinding, a significantamount of heat was generated in the grinding chamber dueto particle-particle and particle-hammer friction during sizereduction. The moisture loss from the feedstock materialcan be attributed to this heating during the grindingprocess, as well as the increase in surface area of thebroken particles, which facilitated drying.A comparisonwas done across each feedstock to determine whether therewas a significant change in moisture content of the groundmaterial. For corn, the moisture loss was significant forinitial moisture contents of 16.02% and 19.64% (p < 0.05).The moisture loss due to grinding was higher for corncobsthan for corn kernels and was significant at all moisturelevels. This could be due to more heat generated by frictionduring grinding of the harder corncobs compared with thesofter corn kernels. The components of the cobs are madeup of polysaccharides, including mainly cellulose, hemicellulose,and lignin, which form rigid structures that areoften more difficult to break down (Kaliyan and Morey,2008). In particular, the hard rind at the center of the cobaccounts for approximately 60% of the cob composition.Although there were differences in the moisture of groundmaterial across different initial moisture contents, the finescollected had no statistically significant differences inmoisture. This moisture loss trend underlies the importanceof including moisture loss in the mass balance calculationsfor a size-reduction process. In an industrial-scale process,the weight loss of the feedstock material can significantlychange the grinding output due to the high levels of heatgenerated in a continuous grinding operation and should betaken into account when sizing equipment during thedesign process.
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