溢流管开缝对旋流器分离性能影响研究  

Research on Influence of Overflow Pipe Slit on Separation Performance Hydrocyclone

作　　者：张文华[1] 李东来 刘秀林 张宏斌[1] 郭建华[1] ZHANG Wenhua;LI Donglai;LIU Xiulin;ZHANG Hongbin;GUO Jianhua(School of Mechanical and Electronic Engineering,Qiqihar University,Qiqihar 161006,Heilongjiang,China)

机构地区：[1]齐齐哈尔大学机电工程学院,黑龙江齐齐哈尔161006

出　　处：《机械科学与技术》2023年第6期857-865,共9页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(51175273);黑龙江省省属高等学校基本科研业务费科研项目(135409309)。

摘　　要：针对水力旋流器分离过程中溢流管内部流体高速旋转造成的大量能量损失,基于压降机理,增加溢流管过流量可降低旋流器内部流体动能损失,将直径为100 mm型号旋流器溢流管设计为:水平开缝、上倾开缝、下倾开缝的渐缩开缝型溢流管。选用多相流VOF模型和雷诺应力模型(RSM)计算不同型号旋流器的分离性能,对旋流器内部速度场、压力场进行了细致分析,并在相同实验条件下对改进前后的水力旋流器进行物料分离实验,研究新型水力旋流器节能效应。结果表明:压降降低主要与轴向速度、切向速度衰减、压强降低梯度有关。入口流量在880~1000 mL/s范围内,溢流管水平开缝、上倾开缝、下倾开缝的旋流器与常规旋流器分离效率基本趋同,且在入口流量为980 mL/s时分离效率达到最高,此时相较于常规型水力旋流器压降降幅率分别为23.79%、11.65%、26.46%,节能效果显著。In view of the large amount of energy loss caused by fluid high-speed rotation in the overflow pipe during the separation process of hydrocyclone,based on the pressure drop mechanism,the loss of kinetic energy in the hydrocyclone can be reduced by increasing the flow rate of the overflow pipe.The overflow pipe of a hydrocyclone with a diameter of 100mm is designed as a cone shape and the lower part of the overflow pipe is cut into horizontal incision、upward bevel incision、downward bevel incision respectively.The multiphase flow volume of fluid(VOF)model and Reynolds stress model(RSM)were used to calculate the separation performance of different hydrocyclones,the internal velocity field and pressure field of the hydrocyclone were analyzed in detail,and the material separation experiments were carried out on the conventional and improved hydrocyclones under the same experimental conditions,and the energy-saving effect of improved hydrocyclones was studied.The results show that the pressure drop reduction is related to the axial velocity tangential velocity attenuation and pressure reduction gradient,the inlet flow is in the range of 880-1000 mL/s,and the separation efficiency of improved hydrocyclones and the conventional hydrocyclone is basically the same,and the separation efficiency of the horizontal slit type,upward bevel incision type and downward bevel incision hydrocyclones reaches the highest when the inlet flow is 980 mL/s,compared with conventional hydrocyclone,the pressure drop rates are 23.79%,11.65%and 26.46%,respectively,which have significant energy-saving effects.

关 键 词：水力旋流器 开缝结构 压降 分离效率 分级效率 

分 类 号：TQ051.8[化学工程]