Separating-process drying technology and efficiency for paddy with high moisture content

According to greater market demand that high moisture content paddy must be dried in time during the harvest in south of China and less stock of grain dryer as well as the use efficiency of dryer was affected by the climatic conditions, harvested paddy was divided into drying process of higher moisture content and lower moisture content. When the moisture content of paddy was higher than 18% and the air temperature was 56-85℃, the drying rate was 0.90-2.94%/h. When the moisture content of paddy was lower or equal to 18%, air temperature should be 50-58℃ and the drying rate should be 0.49-0.93%/h. The technology of ventilation and temporary storage was applied during the two drying processes. Spot testing showed that the technique of separating-process drying could reduce the drying time about 12.8h and enhance the average drying rate 0.7%/h, and improve drying quality. Compared with constant temperature drying, the application of the technology could increase capacity 225% in a period of harvest and the use efficiency 152% of the dryer, meanwhile cut down total drying costs 5%. So it is possible for high moisture content paddy to be dried quickly and well.