SIZE REDUCTION AND DENSIFICATION OF HERBACEOUS BIOMASS

Eriks Kronbergs, Mareks Smits

Abstract


Herbaceous biomass can be obtained using delayed harvesting method with moisture content less than 15% and directly densified without drying. Size reduction experiments of common reed stalks as cutting, flattening and densification have been carried out. As the result of reed stalk flattening, more than 8 strips can be obtained from this tubular structure. Average energy consumption 273 – 380 J kg-1 had been stated for reed stalk flattening. Specific cutting energy Escq value varies in 8 – 16 kJ m-2 in dependence of punch orientation angle according cross-section of reed specimen. Specific cutting energy for flattened stalk materials for reed density 600 kg m-3, varies Esc=13.3 – 27 J m kg-1. Densification experiments of compositions from peat particles, coarse wheat stalk and reed material particles from (1 - 2 mm) group with pressure 230 MPa indicated influence of peat proportion. Density 1.0 g cm-3 has been obtained in densification of straw stalk material particle compositions with peat, if peat proportion exceeds 20%.


Keywords


herbaceous biomass; size reduction; densification

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References


Persson, S., 1987. Mechanics of cutting plant material. An ASAE Monograph Number 7.

The use of switchgrass biofuel pellets as a greenhouse gas offset strategy/Samson R., Drisdelle M, Mulkins L. etc.//http://www.reap-canada.com/Reports/bioenergy2000Aug2.html




DOI: http://dx.doi.org/10.17770/etr2005vol1.2134

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