Table 1 lists the average specific energy consumption for grinding selected biomass using the hammer mill with three different screen sizes at two moisture contents. The specific energy consumption for grinding wheat straw with the hammer mill screen sizes of 0.8, 1.6 and 3.2 mm were 51.6, 37.0 and 11.4 kW h t −1, respectively, at 8.30% (wb) moisture content.
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