Design and performance evaluation of an IRRI [International Rice Research Institute, Los Banos, Laguna, Philippines] pre-dryer
1987
Yong Woon Jeon | Halos, L.S. | Elepano, A.R.
A dryer was developed to evaluate the potential of introducing the concept of high temperature short time drying for pre-drying high moisture paddy (and other grains) to approximately 18-20 percent moisture content immediately after harvest to minimize grain deterioration specially during the wet season. A conduction type, continuous flow rotary drum pre-dryer was designed. The dryer is capable of reducing grain moisture content by 1-2 percent per pass when initial moisture is below percent and 3-5 percent per pass when initial moisture is above 24 percent. Design criteria for the dryer were: (1) technical efficiency, (2) simplicity of design, (3) availability of construction materials in the locality, (4) availability of power and fuel materials, and (5) mobility. The drum surface temperature can range from 100 to 150 degrees Celsius for conduction drying of paddy. The drum rotation speed was designed at six revolutions per minute (rpm) which resulted in paddy retention time of 3 to 6 minutes depending on initial moisture content. The effect of high temperature short time drying on grain quality, i.e. milling recovery was found comparable with that of sundried paddy. The dryer is recommended for the rural farmers in tropical and subtropical regions of most developing countries.
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