Research on Pulverizing Characteristic of Woody Biomass by Cutting Mill

Abstract

To investigate the pulverizing characteristic of wood biomass, the dried woody chip with moisture content of 0wt % were chose as the raw material, cutting mill was used to pulverize the wood biomass at different feed rates, the particle sizes (characteristic particle size and average particle size), uniformity coefficient, density, aspect ratio of wood powder and the specific energy consumption were measured, the morphology of the woody particle was observed by SEM (Scanning Electron Microscope), the pulverizing mechanism was also discussed. The results indicate that the specific energy consumption is in a range from 47 to 91 kWh/t; the characteristic particle size is about 600 μm, the average particle size is 750μm or so, and both characteristic particle size and average particle size increase with the growth of feed rate largely; the uniformity coefficient is range from 1.34 to 1.72; the bulk density is about 0.20 g/cm3, the tap density is about 0.30 g/cm3, both bulk density and tap density increase with the increase of the feed rate; the aspect ratio is in a range from 2.16 to 3.07.