摘要
针对旋风式油气分离器内高速旋转流场引起油滴与壁面碰撞而破碎,从而使分离效率降低的问题,设计了多种不同参数组合的旋风式分离器,对分离器内部气液两相流动及分离效率进行了数值模拟和实验研究,其中气相流场采用RNGkε-湍流模型,油滴运动轨迹采用分散相模型.同时,搭建了油气分离器性能试验台,对不同结构参数的旋风式油气分离器在不同工况下的分离效率进行了测试,并利用Malvern激光粒度分析仪对分离器进出口油滴粒径分布进行了测量与分析.研究结果表明,最佳的入口速度与参数组合使得分离器效率最高,对于直径大于25μm的油滴,旋风式分离器完全可以分离.旋风式分离器内部油滴分离的数值模拟与实验对比表明,采用考虑油滴破碎的分散相两相流模型的模拟结果与实验数据吻合良好.
The high-speed swirling flow field in a cyclone separator will cause the breakup of oil droplets because they collide with the wall,thus reducing the separation efficiency.Numerical simulation and experiment were done on separation efficiency and two-phase flow in oil-gas cyclone separators with different geometrical features.The gas flow field was simulated using the RNG k-ε turbulence model and the trajectory of the oil-droplets was calculated by the discrete particle model（DPM）.The test rig was established to measure the efficiency of oil-gas cyclone separators with different geometrical features and inlet velocities.In the experiment,a Malvern particle size analyzer was applied to obtain the droplets diameter distribution at the inlet and outlet of the cyclone separator.The results show that the highest separation efficiency could be achieved with the optimum inlet velocity and structure parameters,and the droplets with diameters of larger than 25 μm could be easily separated.It appears that the predictions are in reasonable agreement with the experimental data when the DPM model considering the oil droplets breakup is used to simulate the separation efficiency of oil-gas cyclone separators.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2011年第7期55-59,共5页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(50906068)
关键词
旋风式油气分离器
油滴粒径分布
数值模拟
分散相模型
分离效率
oil-gas cyclone separator
droplets diameter distribution
numerical simulation
discrete phase model
separation efficiency
