摘要
水力旋流器是一种常见的固液分离设备,但由于其自身结构的限制,致使旋流器分级精度不高。进料体作为多相流进入旋流器的首要通道,对旋流器分级性能有着重要影响,但进料体内高湍流场引起的湍流扩散以及颗粒间的相互碰撞挤压造成的颗粒分级精度低等问题亟待解决。因此,设计了一种复合曲线式进料体结构旋流器,通过对进料体内部流场和颗粒运动调控,降低细颗粒进入底流的比例,从而达到提高分级精度的目的。采用数值分析法探究了直线式、渐开线式、涡状线式、直线导流式以及复合曲线式五种进料体结构旋流器内的流场特性和分级性能特性,突出了复合曲线式进料体旋流器的优越性,分别从压力场、速度场、分级效率等方面进行了全方位探究,最后对其进行了试验探究。结果表明,复合曲线式进料体结构相比于其他进料体结构具有更好的细颗粒分级性能,且内部流场更加稳定,同时等压面分布呈规律性变化,颗粒运动更加平稳。复合曲线式进料体的切向速度明显高于其他进料体结构,颗粒获得更大离心推动力,颗粒更易分级。通过试验探究发现,复合曲线式进料体旋流器的质效率为46.32%,比常规进料体质效率提高了7.32%,复合曲线式型底流中-24μm颗粒含量比常规型降低了15.07%。溢流中-24μm颗粒含量比常规型提高了3.39%,颗粒分级精度大幅提升。
Hydrocyclone is a common solid-liquid separation equipment,but due to its own structural limitations,the classification accuracy in the cyclone is not high.As the primary channel for multiphase flow entering the cyclone,the feed body has a significant impact on the classification performance of the cyclone.However,the problems of turbulent diffusion caused by high turbulent flow field in the feed body and low particle classification accuracy caused by collision and compression between particles urgently need to be solved.Therefore,a composite curve feed structure cyclone has been designed,which reduces the proportion of fine particles entering the bottom flow by regulating the internal flow field and particle motion in the feed body,thereby achieving the goal of improving classification accuracy.The numerical analysis method was used to explore the flow field characteristics and classification performance characteristics of five types of hydrocyclones with different feed-body structure:linear feed body,involute feed body,vortex feed body,linear guide feed body,and composite curve feed body.The superiority of the hyclrocyclone with composite curve feed body was highlighted,and comprehensive exploration was conducted from the aspects of pressure field,velocity field,classification efficiency,and so on.Finally,experimental exploration was conducted on it.The results show that the composite curve feed body structure has better fine particle classification performance compared to other feed body structures,and the internal flow field is more stable.At the same time,the isobaric surface distribution shows regular changes,and the particle movement is more stable.The tangential velocity of the composite curve feed body is significantly higher than that of other feed body structures,and the particles obtain greater centrifugal driving force,making them easier to classify.The experimental results show that the separation efficiency of the compound curve feed body hydrocyclone is 46.32%,which is 7.32%higher than that of the conventional feed body hydrocyclone,and the content of-24μm particles in the compound curve underflow is 15.07%lower than that of the conventional one.The content of-24μm particles in the overflow is 3.39%higher than that in the conventional type,and the particle classification accuracy is greatly improved.
作者
梁志涛
李峰
韩虎
王延超
纪祥飞
LIANG Zhitao;LI Feng;HAN Hu;WANG Yanchao;JI Xiangfei(School of Intelligent Manufacturing and Intelligent Transportation,Suzhou City University,Suzhou 215104,Jiangsu,China;School of Mechanical and Vehicle Engineering,Linyi University,Linyi 276000,Shandong,China)
出处
《有色金属（选矿部分）》
CAS
2024年第2期81-89,共9页
Nonferrous Metals（Mineral Processing Section）
基金
山东省自然科学基金资助项目(ZR2023QE100)。
关键词
复合曲线进料体
细颗粒
分级精度
颗粒运动
旋流器
compound curve feed body
fine particles
grading accuracy
particle motion
hydrocyclone
