Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists

slots for air inlet and gas outlet, through which primary air enters into the reactionchamber at one side, and the producer gas exits the reaction chamber at the otherside. The slots, six at each side, are provided as illustrated in Figure 2.9.Slots,1.5 x 1115 outside dia.,5mm thick11122101.514Dimensions are in cmFigure 2.9: Slotted cylinder (shown upside down)A mild steel grate is welded to the base of the cylinder. The grate (Figure 2.10) ismade of round mild steel rods of 12.5 mm diameter, and allows ash to fall through itinto the ash pit. An ash scraper (Figure 2.11) is fixed below the grate, to remove ashaccumulated inside the reaction chamber. The ash scraper is especially useful whileusing fuels of high ash content, such as ricehusk briquettes, since accumulated ashcould otherwise block the flow of fresh fuel from the fuel chamber into the reactionchamber.Outer dia., 1.5Mild steel rod, 1.5 dia.2.5 gapDimensions are in cmFigure 2.10: Grate (welded at the base of the perforated cylinder)11