基于CFD-DEM耦合的动态选粉机机理研究  

作　　者：王广 谢传东 宋传杰 

机构地区：[1]合肥水泥研究设计院有限公司,安徽合肥230051 [2]中建材(合肥)粉体科技装备有限公司,安徽合肥230051

出　　处：《中国水泥》2024年第6期55-59,共5页China Cement

基　　金：中国建材集团原创技术策源地“揭榜挂帅”任务-“水泥基材料数字化研发”,项目编号:2021YCJS01。

摘　　要：基于CFD-DEM耦合方法,建立工业级动态选粉机三维数值模型,探究动态选粉机内部详细的颗粒运动轨迹与选粉机理,为后续动态选粉机优化奠定基础。研究结果表明:选粉机转笼外部气流速度低,转笼内部气流速度高,这给颗粒一个向转笼内部运动的加速度。大直径颗粒质量与离心力大、加速慢,在叶片打到颗粒前,粗颗粒的速度不足以穿过动叶片。反之细颗粒质量与离心力小,加速效果明显,有足够的速度穿过动叶片。被转笼阻挡的粗颗粒下落的关键因素是气流带料能力,而不单单靠颗粒自身重力与动能损耗。Based on the CFD-DEM coupling method,a three-dimensional numerical model of an industrial-grade dynamic separator is established to investigate the detailed particle trajectory and powder classification mechanism inside the classifier,laying the foundation for subsequent optimization of the dynamic separator.The research results demonstrate that the airflow velocity is lower outside the rotor and higher inside the rotor of the powder classifier,providing an acceleration for particles to move towards the inside of the rotor.Coarse particles with larger diameters have higher mass and slower acceleration,resulting in insufficient velocity to pass through the moving blades when colliding with them.In contrast,fine particles with smaller diameters exhibit significant acceleration and have enough velocity to pass through the moving blades before collision.The key factor for the downward movement of coarse particles blocked by the rotor is the material-carrying capacity of the airflow,rather than solely relying on the gravity and kinetic energy loss of the particles themselves.

关 键 词：动态选粉机 CFD- DEM 选粉机理 

分 类 号：TQ172.633[化学工程—水泥工业]