Study on Molding Technology of Rod-like Biofuel of Forest Residues

The molding technology of rod-like biofuel of different forest residues was studied and the molding effect of feeding gap and feeding rate on different wood properties and particle size was mainly analyzed. The results showed that all of forest residues can be moldied by adjusted feeding gap and feeding rate when containing water ratio was 15% ~25% and particl diameter was not exceeded 30 mm. Secondly, feeding gap was negative correlated with particle size and feeding rate. The molding of sawdust and bamboo chips, little particle size, was under large feeding gap(4~5 mm) and middle feeding rate that motor frequency was 6 Hz or below 6 Hz. While the molding of miscellaneous shrubs and fruit shell of Camellia oleifera, large particle size, was under small feeding gap(1~3 mm) and high feeding rate that motor frequency was 8~11 Hz. In addition, density of rod-like biofuel depended on molding pressure. The densities of rod-like biofuel of different forest residues can exceed 1 g/ cm3by adjusted molding pressure, by using loop die of large length and diameter ratio or controlling feeding gap and feeding rate. Finally, material composition and property of forest residues were the determinants of caloric value of rod-like biofuel. The caloric value of rod-like biofuel of forest sawdust and bamboo chips was about 4 000 kcal/kg, and the caloric value of rod-like biofuel of miscellaneous shrubs and fruit shell of C. oleifera was below 4 000 kcal/kg.

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