柳树河油页岩微波干燥特性及干燥模型

Microwave drying characteristics and modeling of Liushuhe oil shale

干燥预处理对油页岩的利用具有重要的意义,微波干燥是一种快速、高效和节能的干燥方式。在家用微波炉改造基础上搭建了微波干燥实验台,研究了不同微波功率对柳树河油页岩微波干燥特性的影响。并采用单项扩散模型等13个薄膜干燥模型等对微波干燥分别进行动力学分析,结果表明:微波干燥所需的时间远小于传统干燥所需的时间;微波干燥速率要远大于传统干燥干燥速率;油页岩微波干燥过程适用于双项扩散的半经验模型,油页岩微波干燥机理为湿分(液体或蒸气)双项扩散控制过程;300、400和550 W三个功率干燥时能耗相差不大。为了以较少的能耗达到相同的干燥效果,对于柳树河油页岩,以功率550 W干燥为佳。

Drying pretreatment plays an important role in using oil shale. Microwave drying is a rapid, efficient and energy-saving method for drying. An experimental system for microwave drying is set up by remolding the household microwave oven and the influence of microwave power on drying of the Liushuhe oil shale is investigated. The dynamics of microwave drying is analyzed with single diffusion models and 13 thin layers dry models. The result show that the time required for microwave drying is much shorter than that of traditional drying and the rate of microwave drying is much higher. The semi-empirical model of double diffusion is applicable to the microwave drying of oil shale. The microwave drying of oil shale is a double diffusion controlled process by moisture （liquid or vapor）. The energy consumption power with 300, 400 and 550 W is similar. To reach the same drying effect with less energy, the power of 550 W is more appropriate for Liushuhe oil shale.