Improved flatbed dryer
1997
Aldas, R.E. | Gagelonia, E.C. | Bautista, E.C. | Niedo, V.T. (Philippine Rice Research Inst., Munoz, Nueva Ecija (Philippines))
A low-cost, collapsible type, flatbed paddy dryer which was earlier developed in Vietnam was adapted, modified, and evaluated for local condition. The dryer consists of a drying bin, airduct, blower, and furnace. The bins' dimension is 8 m x 3 m x 0.50 m with 0.30 m as the maximum depth of grain bulk and 0.20 m as the space for plenum. Attached to the bins' dryer is an airduct with cross section of 0.9 m x 0.85 m. The furnace consists of 0.81 m x 0.81 m x 1 m bush structure with concentric drum on top fitted with a pipe for better ash separation. The blower is of vane axial flow type with a diameter of 0.75 m. It is designed for airflow of 4 cu m/s and static pressure of 30 mm of water. Drying tests showed that around 3 to 4 tons of palay at initial moisture content of 26 percent can be dried to 15 percent in 5 hours or about 2 percent MC reduction/hr. Milling analysis showed that the mechanically dried sample is comparable with sun-dried sample and better than shade-dried sample. The amount of energy needed to evaporate a kilogram of water ranges from 1.1 to 1.7 kwh. The furnace has a consumption rate of 25 to 28 kg/hr of ricehull and is capable of maintaining the drying air temperature at around 42 deg C. Economic data showed that the annual utilization of 60 days, the return on investment can range from 37 percent to 112 percent. The dryer dries grain uniformly, uses readily available materials such as wood, concrete or steel, uses rice hull as a source of heat and is suitable for seed purposes
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