锥度对天然气净化用旋风分离器流场影响  

Effect of Taper Angle on Fluid Field in Cyclone Separator of Natural Gas Purification

作　　者：李琦[1,2] 罗敏[1] 韩传军[2] 杨雪[2] 管西旗[2] 

机构地区：[1]西南油气田分公司输气管理处,成都610213 [2]西南石油大学,成都610500

出　　处：《石油矿场机械》2014年第12期8-12,共5页Oil Field Equipment

摘　　要：基于计算流体力学,采用RNGk-e湍流模型和离散相模型,研究了锥度在163～175°的天然气净化用旋风分离器的压力场、速度场分布以及分离效率.结果发现,升气管入口附近的部分区域速度和压力变化最大;锥度对筒体及小锥体区域几乎没有影响,而对升气管和大锥体的影响很大,但是并不改变流场的整体分布规律.随着锥度的增加,压降呈递减趋势.气体总速度与切向速度的变化趋势相同,均随锥度的增大而减小.在最小粒径为5μm 时,不同锥度下旋风分离器的分离效率均为100%,但是在顶板附近有不同程度的颗粒堆积现象.锥度为163°和166°时,颗粒返混现象很严重,极易造成旋风分离器的顶板腐蚀穿孔,因此不适于工程实际.在剩余的3种结构中,速度变化相差小,从压降和体积方面考虑,172°的锥角结构最优,可较大程度减少材料耗损,节约制造成本.The computational fluid dynamic (CFD)was conducted to analyze the effect of taper an-gle between 163°to 175°on fluid field in cyclone separator,which was utilized for natural gas pur-ification by using RNG k-epsilon turbulent model and discrete phase model in FLUENT fluid a-nalysis software platform.Some conclusions could be received from the numerical simulation.The greatest changes of velocity and pressure were occurred near the entrance of riser;and there was almost no influence on cylinder and some cone area with different tapers;however,the impact of taper on the riser and most cone area was significant.On the other hand,the distribution of flow field would not be affected by taper as a whole.The separation efficiency of gas-solid is 100% due to the 5 μm minimum particle size,but there is stacked phenomenon inside the cyclone separator which is serious near the roof.Finally,the best structure of cyclone separator was chose with 172° taper what meant a 0.925 m cone length.This structure had the lowest pressure drop and less ma-terial consuming.

关 键 词：旋风分离器 锥度 流场 

分 类 号：TE931.101[石油与天然气工程—石油机械设备]