排尘锥结构对旋风分离器内气固两相分离性能影响的研究  

Analysis of the Influence of Dust Discharge Cone Geometry on the Gas-Solid Flow Field in Tangential Inlet Cyclone Separator

作　　者：谭慧敏[1] 王建军[1] 马艳杰[1] 金有海[1] 

机构地区：[1]中国石油大学(华东)机电工程学院多相流实验室,山东东营257061

出　　处：《高校化学工程学报》2011年第4期590-596,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：教育部重点项目(109159);中央高校基本科研业务费专项资金资助(09CX04027A);中国石油大学研究生创新基金

摘　　要：通过数值模拟的方法,采用RSM湍流模型对直切式旋风分离器三种不同排尘锥结构(排尘锥无缝、开对称缝、开阶梯缝)下的气固两相流场进行了研究。研究表明,三种排尘锥结构都可以将粒径大于8μm的返混颗粒再次分离下来;排尘锥开缝起到分流作用,有效改善排尘锥内气相流场分布,降低压降,便于返混颗粒从侧缝排出,提高抗返混能力,减少颗粒在排尘锥内部长时间停滞的机率,减小堵塞下口的可能性;排尘锥开阶梯缝可以减小涡核中心不对称性,明显提高侧缝的排尘能力,有效消弱返混夹带对3μm小颗粒的影响,提高分离器的操作弹性,减少颗粒间的磨损,为排尘锥结构的进一步优化、提高旋风管分离性能提供依据。The Reynold Stress model was used to simulate the gas-solid flow field of tangential inlet cyclone separator with three different discharge cone geometries（seamless,symmetrical slotted and spirally slotted） separately.The results show that discharge cones with all these three geometries separately can trap the back-mixing particles with diameter bigger than 8 μm again.The slots on the discharge cone can play the role of diffluence;it can improve the gas flow field in discharge cone and reduce the pressure drop.The slots can make the discharge of the back-mixing particles more conveniently,which can improve the restraining back-mixing particles ability of the cyclone,and reduce the number of particles which stay in the discharge cone for a long time.The spiral slots slotted on the discharge cone can reduce the asymmetry of the gas flow vortex core centre in the discharge cone,which improves the discharge ability of the slots significantly and weakens the influence of the back-mixing on the particles with sizes near 3 μm.It can also enhance the operation flexibility of the cyclone separator,and reduce the wear between the particles.All above results provide a base for further research on the improvement of the discharge cone structure and the measures to enhance the efficinency of the cyclone separator.

关 键 词：旋风分离器 排尘锥 开缝形式 气固两相流 

分 类 号：TQ028.24[化学工程] X701.2[环境科学与工程—环境工程]