Field experience of in-store drying of paddy under tropical climate
1990
Soponronnarit, S. | Nathakaranakule, A. (King Mungkut's Inst. of Technology, Thonburi, Sukswas Road Bangkok (Thailand). School for Energy and Materials)
Technical feasibility study of drying paddy in polyester fibre glass silos has been conducted at Jaruwat Rice Mill, Bang Len district, Nakorn-Pathom province [Thailand], about 50 kilometers from Bangkok. Drying rate, quality of paddy, energy consumption and drying cost in terms of energy have been investigated. Two-stage drying has been demonstrated. At first, incoming wet paddy was dried rapidly in batch for a few percentages of moisture content with drying air temperature of 45-49 deg C. Then it was further slowly dried in storage silos with low flow rate of ambient air for about one month. The two-stage drying technique ensured quality safe. Head yield was 42%. Whiteness value measured by KETT-model C 300 was 44. Germination was 94%. The specific energy consumption was found to be 4.87 and 1.46 MJ/kg water evaporated for batch and in-store drying, respectively. It was estimated that the specific energy cost for in-store drying was 0.61 Baht/kg water evaporated or 39.22 Bath/ton of wet paddy dried from 20 to 14.5% wet-basis. In-store drying of paddy has already been accepted by a private rice mill. However, it is still not accepted by farmers.
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