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Analysis of a continuous fluidised-bed microwave rice kernel drying system

Author(s): C. Sangdao

Journal: Maejo International Journal of Science and Technology
ISSN 1905-7873

Volume: 1;
Issue: Special Issue;
Start page: 61;
Date: 2008;
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Keywords: microwave heating | fluidised-bed | rice drying

This paper presents an analysis of a continuous fluidised-bed microwave rice kernel drying system. Its applicator consists of perpendicular slots on a concentric cylindrical cavity excited by perpendicular waveguides. Bulk rice to be dried is dropped along the vertical direction into the centre of the applicator while ambient air is injected in the opposite direction. Statistical data of electric field and temperature distribution in rice kernels were studied with consideration of the probability of kernel orientation. It was found that a density of kernels at 40 percent of the applicator volume with the air flow rate of 6 metres per second was suitable. With a microwave power of 3,200W, the heating time was 6 minutes. The expected capacity was 3.93 litres/hour. These results were used for implementing a fluidised-bed microwave rice kernel drying system.

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