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Old 06-19-2018, 05:05 PM   #1
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Join Date: Jun 2018
Location: Shaoxing
Posts: 4
Using a laboratory paddy separator for broken rice separation experiments

Using a laboratory paddy separator, broken rice separation experiments were conducted and the characteristics of the separation process were studied to provide fundamental information for developing a pilot scale commercial indented cylinder broken rice separator. Effects of trough angle, cylinder speed, and their interaction on the coefficient of separation efficiency were statistically significant at the 1% level. Due to the interaction effect between cylinder speed and trough angle, the trough angle needs to be increased appropriately when an increase in cylinder speed is made if a rapid drop of effectiveness of separation should be avoided.

Physical and engineering properties like moisture content, size, weight of thousand grains, bulk and true densities, porosity, specific gravity and frictional properties like angle of repose and static coefficient of friction were determined for unhulled and dehulled grains of four small millets namely, proso, kodo, foxtail and little millets. Separation-cum-grading performance of three existing cleaning equipments namely, destoner, air screen cleaner and specific gravity separator was evaluated to find their suitability for the selected small millets.

To overcome this, a new technique of cyclone type pneumatic rice polishing system has been developed. In this new technique of rice polishing, the modification of cyclone separator has been tried. The inner surface of the cyclone separator is lined with abrasive surface. Mixture of air and rice particles enters tangentially into the system near the top of the cylindrical section. The grains follow swirling path inside the polisher and come in contact with the hard-abrasive emery surface and get polished. The mixture of bran and milled rice was collected at the bottom of the polisher. The inlet air velocity and feed rate were maintained at 72.2 m/s and 1.5 kg/ min respectively. Abrasion under moderate pressure results in effective polishing of grains under low mechanical and thermal stress. Absence of moving part might be beneficial also to reduce breakage percentage of kernels.

Paddy husker makes use of a pair of rollers with non-uniform motion in opposite directions, under the action of rollers' pressure to husk paddy, then through the vertical air channel, it is separated to husk, which is discharged from upper outlet and the mixture of paddy and husked rice which enter into the next stage. The product is suitable for various types of grain processing and is the ideal equipment for large modern rice milling enterprise.

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