摘要
为提高水力旋流器对细小油滴的分离效率,对旋流器入口结构进行分析,发现弯管形式入口对不同粒径油滴具有重构和聚结的功能,即不同粒径油滴经弯管入口后分布在入口截面的不同位置,结合弯管入口结构设计了一种可实现油滴粒径重构的油水分离旋流器。采用群体平衡模型(Population balance model,PBM)模拟油滴破碎与聚结,对粒径重构旋流器内部流场特性进行数值模拟。对比分析了旋流器在不同角度弯管下的油滴粒度、湍动能、速度、油相体积分数及分离效率变化情况,并开展了室内试验。结果表明:粒径重构旋流器能够提高对细小油滴的分离效率,且180°弯管下分离性能最佳,旋流器总体效率达到97.31%,相对于优化前的旋流器提高了2.85%,内外层入口处油滴粒径分别达到0.36 mm和0.33 mm,呈现出较好的聚结效果。数值模拟结果与试验结果吻合良好,验证了数值模拟的准确性及优化结构的高效性。
In order to improve the separation efficiency of a hydrocyclone for small oil drops,its inlet structure is analyzed.It is found that the inlet of elbow structure has the function of coalescence and reconstruction for different particle-size oil drops.That is to say,different particle-size oil drops enter into different positions of the inlet pipe after passing through the inlet of elbow structure.An oil-water separation hydrocyclone which can realize the reconstruction of particle-size oil drops is designed with the elbow structure of the inlet.The population balance model was used to simulate the breakup and coalescence of oil droplets,and the hydrocyclone with droplet size reconstruction was simulated and analyzed.Particle size distribution,turbulent kinetic energy,velocity,oil concentration and separation efficiency of the hydrocyclone were compared and analyzed,and laboratory tests were carried out.The results show that the oil-water separation hydrocyclone based on particle size reconstruction can improve the separation efficiency of small oil drops and that the hydrocyclone with the 180°bend works best.The efficiency reaches 97.31%,which is 2.85%higher than that of the conventional hydrocyclone,and the particle sizes of oil drops at the inlets of inner and outer layers reach 0.36 mm and 0.33 mm respectively,showing a good coalescence effect.The numerical simulation results are in good agreement with the experimental results,verifying the accuracy of the numerical simulation and the efficiency of the optimization structure.
作者
马骏
何亚其
白健华
孙超
赵宇
杨磊
张爽
宋民航
MA Jun;HE Yaqi;BAI Jianhua;SUN Chao;ZHAO Yu;YANG Lei;ZHANG Shuang;SONG Minhang(Tianjin Branch Co.,CNOOC Ltd.,Tianjin 300452,China;CNOOC Ener.Tech.Drilling&Production Co.,Tianjin 300452,China;School of Mechanical Science and Engineering,Northeast Petroleum University,Daqing 163318,Heilongjiang,China)
出处
《机械科学与技术》
CSCD
北大核心
2021年第9期1347-1354,共8页
Mechanical Science and Technology for Aerospace Engineering
基金
国家高技术研究发展计划项目(2012AA061303)。
关键词
粒度分布
油水分离
旋流器
数值模拟
群体平衡模型
particle size distribution
oil-water separation
hydrocyclone
numerical simulation
population balance model
