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.
作者
胡伟波
苏利威
周甲伟
杨军
纪云
吴晓松
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)
出处
《世界有色金属》
2024年第5期1-3,共3页
World Nonferrous Metals
关键词
侧喷吹
减磨弯头
流动特性
CFD-DEM
气固两相流
Side injection
wear-resistant elbows
flow characteristics
CFD-DEM
gas-solid two phase flow