Volume 7, Issue 4 (winter 2004)
jwss 2004, 7(4): 235-246 |
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R. Amiri Chaijan, M. H. Khosh-Taghaza. Comparison of Kernel Fissuring and Drying Time of Rough Rice under Experimental Fixed and Fluidized Bed Conditions. jwss 2004; 7 (4) :235-246
URL: http://jstnar.iut.ac.ir/article-1-498-en.html
URL: http://jstnar.iut.ac.ir/article-1-498-en.html
Abstract: (20356 Views)
Traditional paddy dryer systems in Iran cause considerable losses in rice production due to non-uniform drying. In order to decrease the amount of kernel fissuring and to increase the drying rate, fluidized bed method was applied in this study for rough rice drying at temperatures higher than normal. An experimental dryer was used for drying the samples. The drying experiments were set up to find kernel fissuring percentage and the drying times under three conditions: fixed, minimum, and full fluidized bed conditions at temperatures of 40, 60 and 80oC. Results showed that the amount of kernel fissuring, at minimum fluidization compared to fixed bed condition, decreased 57%, 68% and 75% at temperatures of 40, 60 and 80oC, respectively. This reduction at full fluidization compared to fixed bed condition, at the above temperatures, was 40%, 54% and 65%. The minimum fluidization method took the lowest and the fixed bed method took the highest drying time. It was concluded that the minimum fluidization drying method had the lowest fissuring and drying times at all experimental temperatures.
Keywords: Rough rice, Fixed bed, Fluidized bed dryer, Drying time, Kernel fissuring, Minimum and full fluidization.
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