微波流化床中稻谷的干燥模型  

The drying model of rice in the microwave fluidized bed

作　　者：孙勤[1] 贾亚兵 程榕[1] 杨阿三[1] 郑燕萍[1] SUN Qin;JIA Yabing;CHENG Rong;YANG Asan;ZHENG Yanping(College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]浙江工业大学化学工程学院,浙江杭州310014

出　　处：《浙江工业大学学报》2019年第1期109-113,共5页Journal of Zhejiang University of Technology

摘　　要：采用自制的微波流化床设备对稻谷进行了干燥。实验测定了不同的热风温度(50～90℃)、微波功率密度(0～1.375 W/g)条件下稻谷微波流化床干燥曲线,并确定了干燥动力学模型。结果表明:微波功率密度越大、热风温度越高,所需干燥时间越短,水分扩散系数越大。干燥过程符合扩散模型,在实验条件范围内水分扩散活化能随着微波功率密度P的增加呈指数关系减小。随着微波功率密度的升高,Ea可降低2.3%～3%,干燥时间减少18%～24%。该模型可以很好地模拟不同条件下干燥过程中稻谷水分随时间变化规律。Self-developed microwave-fluidized bed was applied to dry rice.Drying curves of the rice under different air temperatures(50~90℃)and microwave power densities(0~1.375 W/g)were measured and the drying kinetics model was determined.The results show that the higher the microwave power density and the inlet air temperature,the shorter the drying time and the bigger the water diffusion coefficient.The drying process follows a diffusion model,and the activation energy of the water diffusion decreases exponentially with the increase of microwave power density P.With the increase of microwave power density,E a and the drying time can be reduced by 2.3%~3%and 18%~24%,respectively.The model can well simulate the variation of the water in rice with time under different drying conditions.

关 键 词：微波流化床 稻谷干燥 动力学模型 

分 类 号：TQ028.6[化学工程]