小型传导式高温快速滚筒烘干机的试验研究

Design and Study of a Conduction Type High Temperature Short Time Rotary Drum Dryer

针对南方广大农村目前的经营规模与经济、技术条件,研制了一种小型传导式高温快速滚筒烘干机。通过单因子试验和二次正交旋转组合试验,研究了其主要技术参数与烘干性能的关系,用回归方程对主要技术参数各种组合的干燥效果进行了预测,并经优化计算,得出最佳组合方案。碾米试验表明,经烘干的高含水率稻谷品质与经日晒的相对比下,且整米率还略有提高。说明它是当前农村用以保护稻谷品质,防止霉变的一种经济可行技术。

In order to decrease the mildew losses of grain, a conduction type high temperature short time continuous flow rotary drum dryer was developed in the light of present economic and technical conditions of the vast countryside. On the basis of single-factor tests and guadratic orthogonal rotary combination tests, the relations between main technical parameters and the performance of the dryer was studied. The regression equations were established, and the drying effect of various combinations of the main technical parameters were forecasted.Optimal combinations of the main parameters for paddy with different initial moisture contents were obtained by means of multiple objective nonlinear programming method.The influence of the number of drying passes and the method of final drying on grain qualities was investigated by analyzing the qualities of milled rice from the dried batches. The qualities of the grains dried by the dryer was found comparable with that of sundried paddy. Moreover, the percentage of head rice was raised slightly. Therefore, it was concluded that quick drying of high moisture paddy to a level of moisture content that would arrest deterioration immediately after harvest was a viable technique for grain quality preservation. These results have profound significance for solving the perennial problem of grain deterioration due to delayed drying, especially during the wet season.