Development of a Fully-automated Pilot-scale Model Fluidized Bed Drying System for Complete Drying of Paddy
Keywords:
Paddy, Drying, Fluidized Bed Dryer, Postharvest MachineryAbstract
Fully-automated pilot-scale fluidized bed drying system with 500kg/hr capacity was evaluated using high moisture paddy. Complete drying of paddy with ≥ 28 % (w.b.) initial moisture content was attained after 2 passes of fluidized-bed drying at 2 min exposure to 70 °C drying temperature and 4.9 m/s superficial air velocity, followed by 60 min ambient air tempering period (30 min without ventilation and 30 min with air ventilation) for a total drying time of 2.07 h. Around 82% of normal mechanical drying time was saved at 70 °C drying temperature. The drying cost was calculated to be $0.014 per kilogram of wet paddy. Specific heat energy consumption was only 2.84 MJ/kg of water removed. The Head Rice Yield recovery of the dried paddy passed the Philippine Agricultural Engineering Standards. Sensory evaluation showed that the color and taste of rice samples dried in the fluidized bed dryer were comparable to air dried paddy. The optimum drying parameters of using fluidized bed dryer is 70 oC drying temperature at 2 min fluidization time, 1493 Pa static pressure, 4.9 m/s superficial air velocity, 10 cm grain depth and 60 min ambient air tempering period.
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