Flow Filed Analysis and Performance Evaluation on Axis-in Dual-Stage Tandem Hydrocyclones

Abstract

Abstract: To solve the problems of oil/water separation in narrow spaces might not keep high precision，axis-in dual-stage tandem hydrocyclone was designed according to theory of cyclone separation.Flow field characteristics and separation efficiency of the hydrocyclones were analyzed.The distribution rules of velocity field，pressure field， concentration field and separation efficiency influenced by inlet flow rates and split ratios were obtained.Results show that as the increasing of inlet flow rates，maximum pressure drop grows exponentially，tangential velocity increases as well；tangential velocity of ring runner and second hydrocyclone are gradually decreased with the split ratio of first hydrocyclone increases.The effects of split ratio of second hydrocyclone
in separation efficiency of first hydrocyclone are very little.First hydrocyclone plays main role in separating oil and water，second hydrocyclone plays main role in removing oil from water.Research results identify that the best split ratio of first hydrocyclone is as 20%，to the second hydrocyclone is as 15%.The best inlet flow rate is as 4.8 m3/h，and the best total flow rate of hydrocyclone is as 32%.The axis-in dual-stage tandem hydrocyclone accommodating to variable processing and split ratio completely meets the requirements of practical applications，the maximum separation efficiency reaches 99.6%.

Key words: dual-stage tandem, hydrocyclone, separation efficiency, flow characteristics

摘要： 为解决狭长空间内无法实现油水两相介质高精度分离的问题，结合旋流分离理论，设计了一种可实现轴向进液的两级串联旋流器，针对该装置开展内部流场特性及分离性能研究。揭示了不同处理量及分流比对旋流器内速度场、压力场、浓度场以及分离效率的影响规律。结果表明：随着处理量的增大，底流口压降最大值逐渐增大且增长速率逐渐增大，旋流腔内切向速度也逐渐增大；增大一级溢流分流比，可减小环式通道及二级旋流器内的切向旋动能，二级溢流分流比对一级旋流器分离性能影响不大；实验及模拟得出研究范围内一级分流比为20%、二级分流比为15%时分离效率最高,最佳处理量为4.8 m3/h，最佳总分流比为32%；装置对不同流量、不同分流比条件具有较强的适应性，分离效率最高可达99.6%。

关键词: 两级串联, 旋流器, 分离效率, 流场特性

CLC Number:

TQ051.8

XING Lei1，2;ZHANG Yong1，2;JIANG Minghu1，2;GAO Yang3. Flow Filed Analysis and Performance Evaluation on Axis-in Dual-Stage Tandem Hydrocyclones[J]. China Mechanical Engineering.

邢雷1，2；张勇1，2；蒋明虎1，2;高扬3. 轴入式两级串联旋流器流场分析与性能评估[J]. 中国机械工程.

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