下行床弧面气固快速分离器内的颗粒运动  

Particle Flow Patterns in a GasSolid Separator with Cambered Surface for Cocurrent Downflow Reactors

作　　者：都林[1] 姚建中[1] 林伟刚[1] 

机构地区：[1]中国科学院过程工程研究所多相反应实验室,北京100080

出　　处：《过程工程学报》2003年第6期481-485,共5页The Chinese Journal of Process Engineering

基　　金：国家863计划项目(编号: 2001AA529010); ;中国科学院多相反应开放室基金资助项目

摘　　要：采用二维相位多普勒颗粒分析仪(PDPA)对下行床弧面气固快速分离器内颗粒相的流动进行了定量测量,得到了分离器内颗粒运动向量图、体积通量分布和粒径分布. 颗粒通过气固惯性的差别、弧面、挡板的碰撞导向和浓缩作用实现气固分离. 弧面附近颗粒体积通量有较宽的分布,但主要集中在靠近弧面处,对分离有利. 在横向气相曳力和湍流扩散的作用下,在弧面附近小颗粒向外围扩散,粒度分布逐渐形成双峰特征. 减小喷嘴宽度,可以减弱颗粒向外围扩散的程度,提高分离效率.The particle flow patterns in a gassolid separator for cocurrent downflow reactors have been studied with a phase Doppler particle analyzer (PDPA), which allows the measurement of particle size and velocity simultaneously. Volumetric flux, particle size distribution and particle velocity vectors are obtained. It is found that the internal components including the rectangular nozzle, circular arc camber and baffles play important roles in the gassolid separation process. Particles are separated from gas phase due to the gassolid inertia difference and the collision between the particles and the internal components. Although volumetric flux has a wide distribution in the cross direction, particles are mainly concentrated near the camber surface. Due to turbulent dispersion and drag force in the cross direction, small particles gradually move away from the cambered surface, leading to double-peak distributions of particle size, which influences the collection efficiency of particles. By reducing nozzle width, separation efficiency can be improved.

关 键 词：下行床 气固分离器 相位多普勒颗粒分析仪 PDPA 颗粒运动 

分 类 号：TQ028[化学工程]