Density and porosity of the cut and ground material of energy plants.

Density and porosity of the cut and ground material of energy plants. The work aimed at determination of bulk and specifi c density and porosity for the three energy plant species: rose (Rosa multifl ora), giant miscanthus (Miscanthus sinensis gigantean) and Virginia mallow (Sida hermaphrodita). The differences in bulk and specifi c density and porosity are the species features of energy plants and result from the method for material fragmentation. The bulk density of cut material was by 17% higher than that of the ground material, and for the rose (240 kg/m3) by over 3.5 times higher than for the miscanthus and the Virginia mallow; these values for the latter created a homogeneous group (68 kg/m3). The specifi c plant material density of Virginia mallow, rose and miscanthus, designed for briquette production, amounted to 1207, 1162 and 640 kg/m3, respectively. The cut material porosity depended on the energy plant species and method for its fragmentation, as well as on dimensions and shape of the particles.