含油污泥-石英砂双组分颗粒的流化行为

Fluidization Behavior of Oily Sludge-Sand Binary Particle Mixture

在内径60mm、高1200mm的玻璃流化床中,对含油污泥-石英砂双组分混合颗粒进行了流化行为研究.结果表明,含油污泥颗粒因含油量较高,粘性较大,无法实现单独流化,掺入一定比例石英砂颗粒后,可平稳流化.随着含油污泥量增加,气速降低时颗粒从流化状态到固定床状态的转变为渐变过程,流化效果变差.采用Kumar-Gupta公式的形式对颗粒混合物重新进行拟合,获取新的公式参数,对最小流化速度umf的预测误差在5%以内.

The fluidization behavior of oily sludge（OS） -sand binary mixture was studied in a glass fluidized bed with 60 mm I.D. and 1200 mm height. The results show that the OS particles used cannot be fluidized alone,because of its high oil content and hence the high adhesive force between the particles. The OS can be smoothly fluidized when admixed with a certain fraction of sand. With the increase of OS content in the mixture,the defluidization process becomes gradual and with channeling. An equation similar to that of Kumar-Gupta put forward was fitted with the experimental data. And new parameters for different particle mixtures were obtained. Most of the errors in prediction of umf using the equation were lower than 5%.