蚕蛹变温压差膨化干燥特性及其动力学模型研究

Drying Characteristics and Kinetic Modeling of Silkworm Pupa by Explosion Puffing Drying at Variable Temperatures and Pressure Difference

以蚕蛹为原料,研究不同膨化温度、不同铺料密度、不同压力差和不同停滞时间对蚕蛹变温压差膨化干燥特性的影响,得到蚕蛹变温压差膨化干燥的干燥速率曲线和干燥特性曲线,建立了干燥动力学模型。研究表明,蚕蛹在变温压差膨化干燥过程中有加速干燥、恒速干燥和降速干燥3个阶段;膨化温度越高、铺料密度越小、压力差越大和停滞时间越短,所需的干燥时间越短,干燥速率越高;蚕蛹变温压差膨化干燥过程符合Page模型,经验证,该模型实验值与预测值拟合较好,可以用来描述和预测变温压差膨化干燥过程任意时刻蚕蛹水分比的含量。

Variable temperature differential pressure puffing drying rate curve and drying characteristic curve of silkworm pupa were acquired by analyzing influences of expansion temperature,traying density,pressure difference and stagnation time on drying characteristics,the variable temperature differential pressure puffing drying kinetics model of silkworm pupa was set up.The results indicated that the variable temperature differential pressure puffing drying process of silkworm pupa contained acceleration,constant speed and deceleration stages.The higher the expansion temperature,the lower the traying density,the greater the pressure difference and the shorter the stagnation time,the shorter the drying time required and the higher the drying rate;The variable temperature differential pressure puffing drying model of silkworm pupa conformed to the Page model,the experimental value and the predicted value of this model is a good agreement,and it can be used to describe and predict the moisture ratio of silkworm pupa during the variable temperature differential pressure puffing drying process.