水稻間歇通風乾燥法之研究--水稻濕穀搶救乾燥法之研究
Other Title
A Study on Rice Rapid Drying by the Process of Grain Cyclic-Flow Drying
Journal
農業工程學報
Journal Volume
15
Journal Issue
3-4
Pages
26-31
Date Issued
1969-11
Author(s)
鄔清標
Ching-Piao Wu
Abstract
1.循環式間歇通風乾燥法雖利用60℃，70℃及80℃通風量0.5方公尺/sec 以下之高溫低風量，但仍舊未曾發生大量之胴裂，故循環式間歇乾燥法效果極佳。
2.水份減少率對胴袋之發生，依品種之不同略有差異。
3.水份減少率太大時，不易發生胴裂之品種也會起胴裂，故乾燥速度不應太快，如農林91號種之m值不宜超過4﹪，臺南五號種，不宜超過22﹪，但假若增加穀粒之循環速度，則m值可略為增加。
4.通風溫度之增高對水份率m值之提高有顯著之影響。
5.穀子通道之熱空氣進口面與出口面應保持平行方向，而不可成直角方向，以避免通風量對水份減少率m值之影響發生一降落點。
6.穀子通道之寬度過狹時，由於流動穀粒之堆積密度較疏，熱空氣之流損較高而使m值降低，故不宜過狹。
1.In spite of blowing heated air with the quantity of 0.5 cubic meter per second, and the temperature of 60℃, 70℃, 80℃, respectively, which is considered as high temperature and low blowing quantity, there is no noticeable grain cracking effect arising in the process of continuous cyclic-flow drying. Therefore, the method of continuous cyclic-flow drying is considered as very efficient.
2.Through drying process, the effect on arising grain cracking due to decreasing speed of moisture content of grain varies slightly with species which we operated.
3.If the decreasing speed of moisture content of grain is too fast, the cracking effect will be arisen in the species which is not apt to be cracked. Therefore it is not fit to dry grain too fast. For example, the drying speed of Agriforest-91 is not fit to exceed 4﹪ (the drying speed of grain is expressed in percentage of decreasing of moisture content of grain) and Tainan-5 2.5﹪ but if the speed of continuous cyclic-flow of grain is increase, the value "m" will be increase too.
4.The increase of temperature of heated air flow will obviously effect on raising value "m" (percentage of decreasing of moisture content of grain)
5.The inlet face and outlet face of air flow in grain chamber should be designed as parallel, but not perpendicular, in order to avoid arising a lowering point of value "m" due to the effect of air flow.
6.If the width of flowing way of grain in drier is too narrow, the stack density of flowing grain will be decrease. And a great heat loss will be cause to lower the value "m". Therefore, it is not fit to design a narrow flowing way of grain in continuous cyclic-flow drier.
Subjects
水稻乾燥
含水量
Publisher
社團法人臺灣農業工程學會
Type
journal article