Study of hybrid dryer prototype and its application in pregerminated rough rice drying |
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| Authors: | Titaporn Tumpanuvatr Vipa Surojanametakul |
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| Affiliation: | 1. Department of Food Science and Technology, Faculty of Agro-Industry, Kasetsart University, Chatuchak, Bangkok, Thailand;2. Center for Advanced Studies for Agriculture and Food, Kasetsart University Institute for Advanced Studies, Kasetsart University, Bangkok, Thailand;3. Institute of Food Research and Product Development, Kasetsart University, Chatuchak, Bangkok, Thailand |
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| Abstract: | In this study, a hybrid dyer, combining heat pump drying (HPD) with fluidized bed drying (FBD) concepts were designed and fabricated. The pregerminated rough rice (pre-GRR) was dried in multistage using this hybrid dryer to compare with the single-stage drying by hot air dryer. The objectives were to test the application of this hybrid dryer and determine the suitable drying condition for pre-GRR. The result indicated that the punched plate distributor was the most suitable distributor. The pre-GRR should be dried by the three-stage drying method using either FBD or HPD at 45°C in the last stage to obtain higher head rice yield, lower fissure grain, and better color values than their counterparts. The scanning electron micrographs proved that starch gelatinization occurred when applying FBD at temperatures between 100 and 140°C causing the adhesive connections inside the kernels and subsequent decrease in fissures. |
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| Keywords: | Fluidized bed drying heat pump drying hybrid dryer pregerminated rough rice |
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