装料量对胡萝卜丁真空脉动干燥动力学的影响及模型拟合

Base on the drum pulse vacuum dryer, this paper investigated the drying kinetics and model fitting of the carrot cubes under different material quantities (1000, 1500, 1800, 2000 and 2200g). Results indicated that: the effect of material quantities on the drying time of carrot cubes was significant. With increasing the material quantities the drying time which the materials achieved the same moisture content increased. When the material quantityies was 1000g, the carrot cubes only had a rising rate drying phase and a falling rate drying phase, With increasing the material quantities the carrot cubes appeared a smoother constant drying rate phase, when the material quantities added to 2000g the constant drying rate phase of the carrot cubes appeared greater volatility. The surface temperature curves of the carrot cubes had increased, balance and second increased phases with the carrot cubes rising rate drying phase, constant drying rate phase and falling rate drying phase. When the material quantities between 1000g to 1800g and the moisture content of material≧ 25%,Page equation was used to fit the drying process of carrot cubes. The simulation equation is: ln (-lnMR) =- 7.042393761-0.000729367m + 1.562319834 ln t (R2 = 0.993). The goodness of model fitting was higher.