基于CFD-DEM耦合模拟的侧喷吹管道减磨弯头流动特性分析  

Study on the flow characteristics of wear-resistant elbow in side injection pipeline by CFD-DEM coupled simulation

作　　者：胡伟波 苏利威 周甲伟 杨军 纪云 吴晓松[4] HU Wei-bo;SU Li-wei;ZHOU Jia-wei;YANG Jun;JI Yun;WU Xiao-song(Henan REDC pneumatic conveying equipment Co.Ltd,Xinxiang,453400;North China University of Water Resources and Electric Power,Zhengzhou 450045;Yanshan University,Qinhuangdao,066004;CINF Engineering Co.,Ltd.,Changsha,410019)

机构地区：[1]河南瑞德克气力输送设备有限公司,河南新乡453400 [2]华北水利水电大学,河南郑州450045 [3]燕山大学,河北秦皇岛066004 [4]长沙有色冶金设计研究院有限公司,湖南长沙410019

出　　处：《世界有色金属》2024年第5期1-3,共3页World Nonferrous Metals

摘　　要：为实现煤粉颗粒在管道和喷枪内的稳定可靠输送和精确喷吹,以气固两相物料在弯头内的流动特性为对象,采用计算流体力学与离散元耦合(CFD-DEM)方法对普通弯头、T型弯头、堵塞型弯头、球型弯头内颗粒运动情况进行分析,研究发现:颗粒流经三种减磨弯头时速度会出现显著的下降,同时还会引起显著气流速度和压强的波动,上述现象以T型弯头最为显著;减磨弯头通过颗粒床中颗粒-颗粒碰撞减小颗粒对管壁的冲击,三种减磨弯头中颗粒-颗粒碰撞次数与碰撞法向力均较高,可能引发喷吹物料流动的紊乱。The flow characteristics of gas-solid two-phase flow in elbows are numerical simulated by computational fluid dynamics and discrete element coupling method(CFD-DEM).The aforementioned flow characteristics are important factors to ensure stable and reliable transportation of side injection for coal powder particles in nonferrous metal smelting.The ordinary elbows,the T-shaped elbows,the blind elbows,and spherical elbows are selected to discuss.The results show that there is significant velocity decrease in the three wear-resistant elbows.Meanwhile,significant fluctuations in airflow velocity and pressure are also found in the wear-resistant elbows,which is most significant in the T-shaped elbows.It is also found that the wear-resistant elbow can reduces the wall erosion by particle-particle collisions rather than particle-wall collisions.The number of particle to particle collisions and the contact normal force are relatively high in the three types of wearresistant elbow,which is a potential factor to flow turbulence in sprayed processing.

关 键 词：侧喷吹 减磨弯头 流动特性 CFD-DEM 气固两相流 

分 类 号：TF801[冶金工程—有色金属冶金]