Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists

Dimensions are in mmFigure 7.3: Dimensional details of the biomass stoveAlthough designed for honeycomb briquettes, the stove has been found to work wellwith other biomass fuels as well, such as fuelwood, wood chips and twigs. Inlocations where honeycomb briquettes are not available, this stove can thus beoperated using these other fuels.Production of Honeycomb BriquettesThe technique involves the following three stages:(i) Partial carbonization of biomass residues,(ii) Mixing of char with a binder, and(iii) Briquette moulding and drying.The procedure requires a charring drum in which the biomass is charred. The charobtained by the carbonization of biomass residues is crushed and mixed with abinder such as clay, and then briquetted in a briquette mould into cylindricalhoneycomb briquettes. The details of the technique are presented below.(i) Charring DrumThe charring drum can be fabricated using empty crude oil drum of 200-litrecapacity. It is fitted with a conical shaped grate with fixed chimney and a top coverand water seal arrangements as shown in Figure 7.4.39