旋风分离器环形空间顶灰环的流动特性  

Flow Characteristics of Top Ash Ring in Cyclone Separator

作　　者：曹鸣谦 陈建义[1,2] 樊骁琦 崔灏 魏耀东[1,2] CAO Mingqian;CHEN Jianyi;FAN Xiaoqi;CUI Hao;WEI Yaodong(State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China;Beijing Key Laboratory of Process Fluid Filtration and Separation,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249 [2]中国石油大学(北京)过程流体过滤与分离技术北京市重点实验室,北京102249

出　　处：《石油学报（石油加工）》2024年第1期183-192,共10页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(22078357)资助。

摘　　要：旋风分离器环形空间内由于二次涡的作用在上部存在一个旋转的顶灰环,不仅会降低分离效率,而且会造成冲蚀磨损。采用有机玻璃制造的PV型旋风分离器(筒体直径D=160 mm)以及丙烯腈待生催化剂和铁矿粉,在入口气速(v_(in))为12~20 m/s、入口气流颗粒质量浓度(C_(in))为10~100 g/m^(3)条件下进行实验,利用高速摄像机考察顶灰环的流动特性。实验结果表明:顶灰环存在周期性脱落现象;脱落周期与入口气速和入口气流颗粒质量浓度有关,且随入口气速增大而增大,随入口气流颗粒质量浓度增大而减小。为进一步分析顶灰环的形成机理,利用Fluent模拟了环形空间的气相流场。结果表明,二次涡对颗粒群的夹带形成了顶灰环,顶灰环颗粒的积累导致顶灰环发生周期性脱落。在模拟分析基础上建立了基于准数关联的顶灰环脱落周期的预测模型。There exists a rotating top ash ring in the cyclone separator annular space due to the action of the secondary vortex,which will not only affect the separation efficiency but also cause erosion and wear.Using a PV type cyclone separator(barrel diameter D=160 mm)made of Plexiglas,spent acrylonitrile catalyst and iron ore powder,experiments were conducted at the inlet gas velocity(v_(in))of 12—20 m/s and the inlet particle mass concentration(C_(in))of 10—100 g/m^(3),and then the flow characteristics of the top ash ring were investigated by a high-speed camera.The experimental results show that the top ash ring falls off periodically;the falling-off period is related to the inlet gas velocity and inlet particle mass concentration,which increases with the increase of inlet gas velocity and decreases with the increase of inlet particle mass concentration.To further analyze the formation mechanism of the top ash ring,the gas-phase flow field in annular space is simulated by Fluent.The simulated results show that the entrainment of particles by secondary vortices has led to the formation of top ash ring,and the ash particles aggregation will cause the periodic falling-off of the top ash ring.Relying on the simulation analysis,a prediction mode based on criterion number correlations was established for the falling-off period of the top ash ring.

关 键 词：旋风分离器 顶灰环 颗粒聚集 脱落 数值模拟 

分 类 号：TQ051.8[化学工程]