含油污泥薄层干燥特性及动力学模型分析

采用薄层干燥方式进行含油污泥热干燥的研究,引入薄层干燥模型对含油污泥干燥过程进行模拟,结果表明,Midilli模型比其他模型更适合含油污泥的薄层干燥分析。应用Fick扩散模型,得到80～140℃条件下含油污泥干燥的有效扩散系数变化范围为1.08×10-10～4.22×10-10 m2/s,其值随着温度升高而增大。根据Arrhenius经验公式建立温度与扩散系数的关系,得到含油污泥干燥时水分扩散的活化能为27.26kJ/mol。

Analysis of Drying Characteristics and Dynamics Model of Oily Sludge Thin Layer

Thin layer drying methods are used to carry out oily sludge thermal drying research,with thin layer drying models introduced to simulate the oily sludge drying process.The results show that Midilli model is more suitable for thin layer drying analysis of oily sludge than other models.The application of Fick diffusion model obtains the effective diffusion coefficient range of oily sludge drying as 1.08×10-10 to 4.22×10-10 m2/s,whose value increases as the temperature rises.The relationship of the temperature and the diffusion coefficient is established according to Arrhenius experience formula,obtaining moisture diffusion activation energy during oil sludge drying of 27.26 kJ/mol.