Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists
Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists
Dimensions are in mmFigure 7.2: Backside view of the hybrid cabinet dryerThe stove uses cylindrical honeycomb briquettes, each of 13 cm diameter and 9 cmheight, and can accommodate eight briquettes simultaneously. The stove is made of2 mm thick mild steel sheet and is rectangular in shape. It is 30 cm x 60 cm in size,with a height of 15 cm. A grate is fixed about 5 cm above the base of the stove. Figure7.3 illustrates the dimensional details of the stove.The grate is made of 5mm steel rods. The distance between two rods in the grate is 6cm. Towards the base are four rectangular openings for the entry of primary air andalso for the ignition of the honeycomb briquettes. There are rectangular slidingcovers in the holes, which can be adjusted to regulate the flow of primary air. Thestove is covered with a hood at the top, which is connected to the heat exchangerthrough a connector. The hood channels the hot flue gases from the stove into theheat exchanger unit inside the drying chamber. The stove is attached to the dryerstand with mild steel angles.During start-up, honeycomb briquettes are placed over the grates, and ignited fromthe bottom using a flame torch. Depending on the heat requirement, one to eighthoneycomb briquettes can be ignited in the stove simultaneously.38
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
- Page 1: Technology Packages:Solar, Biomass
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- Page 6 and 7: PrefaceIt is increasingly becoming
- Page 8 and 9: NepalEr. Rishi K. B. ShahVice Presi
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- Page 18 and 19: LidWater sealFuel chamberGas burner
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- Page 38 and 39: Figure 5.1: Improved solar cabinet
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- Page 52 and 53: chimney is removed and the drum is
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Dimensions are in mmFigure 7.2: Backside view of the hybrid cabinet dryerThe stove uses cylindrical honeycomb briquettes, each of 13 cm diameter <strong>and</strong> 9 cmheight, <strong>and</strong> can accommodate eight briquettes simultaneously. The stove is made of2 mm thick mild steel sheet <strong>and</strong> is rectangular in shape. It is 30 cm x 60 cm in size,with a height of 15 cm. A grate is fixed about 5 cm above the base of the stove. Figure7.3 illustrates the dimensional details of the stove.The grate is made of 5mm steel rods. The distance between two rods in the grate is 6cm. Towards the base are four rectangular openings for the entry of primary air <strong>and</strong>also for the ignition of the honeycomb briquettes. There are rectangular slidingcovers in the holes, which can be adjusted to regulate the flow of primary air. Thestove is covered with a hood at the top, which is connected to the heat exchangerthrough a connector. The hood channels the hot flue gases from the stove into theheat exchanger unit inside the drying chamber. The stove is attached to the dryerst<strong>and</strong> with mild steel angles.During start-up, honeycomb briquettes are placed over the grates, <strong>and</strong> ignited fromthe bottom using a flame torch. Depending on the heat requirement, one to eighthoneycomb briquettes can be ignited in the stove simultaneously.38
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