Drying of Paddy Indian Institute of Technology Kanpur干燥稻谷的印度技术学院坎普尔.pptVIP

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Drying of Paddy Indian Institute of Technology Kanpur干燥稻谷的印度技术学院坎普尔.ppt

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Drying of Paddy Next Importance of drying Drying of Paddy Next End At harvest time rice grain contains a lot of moisture (20-25%). High moisture promotes the development of insects and molds that are harmful to the grain. High moisture in grain also lowers the germination rate of paddy. Delays in drying, incomplete drying or ineffective drying reduce seed/grain quality. Economic Benefits from Drying Drying of Paddy Increased market value of the (higher quality) paddy Secured income from minimizing weather risk Increased income from being able to process more grain in a given time Next Previous End Moisture contents required for safe storage for different storage periods Drying of Paddy Storage period Safe moisture content (%) 2 to 3 weeks 14 - 18% 8 to 12 months 13% or less More than 1 year 9% or less Next Previous End How to dry paddy ? Drying of Paddy Improper drying leads to fissure development in rice. Fissure has significant effect on quality of rice, such as decrease of head rice yield and taste value of cooked-rice It is therefore recommended to dry paddy in multiple pass instead of single pass. Next Previous End Methods of Drying Drying of Paddy Field Drying or Stacking Sun Drying Mechanical drying Next Previous End Overview of drying methods Drying of Paddy Method Crop Flow Drying Technology Characterization Field drying Piles, racks Rapid quality reduction Sun drying Batch Drying pavements or mats Cheap Labor intensive Typically poor milling quality Heated air drying Batch Fixed bed dryer Inexpensive, small scale operation possible Local construction from various materials Operation with unskilled labor Moisture gradient Labor intensive Re-circulating batch dryer Mixing of grain Large capacity range Good quality Skilled laborers required Medium capital investment After-sales service requirement Wear of moving components Continuous Continuous flow dryer Large capacity Economics of scale High capital investment Not feasible for small