【摘要】 利用隧道式干燥器在不同热风温度、流速及物料厚度条件下,研究了干燥环境对纸浆模塑干燥过程的影响;并采用Page等六种薄层干燥模型对降速干燥过程进行拟合,分析了其有效扩散系数。结果表明:较高的热风温度、热风流速及较薄的物料厚度能够显著缩短干燥时间;Logarithmic模型可以准确预测纸浆模塑干燥曲线;热风温度、热风流速和物料厚度对有效扩散系数影响明显。更多还原

【Abstract】 The dry environment’s influence on the molded pulp drying process in different condition of hot air temperature,velocity and material thickness was studied by using a tunnel drier. Drying curves of falling drying rate period were fitted by six thin-layer models and the effective diffusion coefficients were also analyzed. It was found that higher temperature and velocity of air-flow and thinner thickness of the molded pulp product could obviously reduce the drying time. Logarithmic model exhibited a better fit to the experimental drying data of falling-rate period comparing with the other models. The effective moisture diffusivity(Deff) at all experiment conditions was evaluated and it was found that higher temperature and velocity of air-flow and thinner thickness of the molded pulp product could greatly increase the value of Deff.更多还原