柱型旋流器内油-水两相流的流场特征和分离性能  

Investigation on flow field and separation characteristics of oil-water two-phase flow in cylindrical cyclone

作　　者：朱沫 欧宇钧 吴辰 吴奇霖 张健[3] 许晶禹[3] Mo Zhu;Yu-jun Ou;Chen Wu;Qi-lin Wu;Jian Zhang;Jing-yu Xu(Shenzhen Branch of CNOOC Energy Development Equipment Technology Co.,Ltd,Shenzhen 518000,China;Shenzhen Branch of CNOOC,Ltd,Shenzhen 518000,China;Institute of Mechanics,CAS,Beijing 100190,China)

机构地区：[1]中海油能源发展装备技术有限公司深圳分公司,深圳518000 [2]中海石油(中国)有限公司深圳分公司,深圳518000 [3]中国科学院力学研究所,北京100190

出　　处：《水动力学研究与进展（A辑）》2022年第1期49-55,共7页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(11972039)。

摘　　要：柱型旋流器采用切向入口的方式产生稳定的旋流场,实现两相的分离,具有占地面积小和分离效率高等优点。该文采用数值模拟的方法对旋流器内油-水两相流动时的流场特征进行系统的分析,并采用原油对旋流器的分离性能进行实验验证,研究结果可直接应用于石油工业中的原油-水两相分离。数值模拟中将研究得到的混合液表观黏度计算模型嵌入到CFD软件中,有效提高了计算的精度。研究得出,柱型旋流器的切向入口、柱型主体和溢流口等综合设计在其内部能够形成稳定且有效的强旋流场,深入揭示了油-水两相的分离机理和过程。分流比对柱型旋流器中心涡长度的影响较为明显,随着溢流口分流比的增加,中心涡的长度近似呈指数增加的规律,指数系数约为0.39,分流比对零轴向速度面的影响微小。得出柱型旋流器处理后的水中含油率可由8.26%降至约0.18%,对应的分离效率为64%。柱型旋流器主体的管径对处理效果具有较大的影响,实际应用中,需针对不同的来液条件进行柱型旋流器的选型和设计,且旋流器对于原油-水两相的分离效果存在最佳分流比。Cylindrical cyclone is new type of oil-water separation equipment which can produce a stable swirling flow field by through the tangential inlet design.It is advantaged on the space usage and separation efficiency.In the paper,the oil-water two-phase flow field and separation characteristics in cylindrical cyclone is studied by the numerical simulation and experiments.The results show that the structure design of the cylindrical cyclone can produce a stable and efficient velocity distribution which is useful to the oil-water two-phase separation.The flow split ratio has a great influence on the length of the core vortex.As the increasing of the up-outlet flow split ratio,the length of the core vortex in the cylindrical cyclone is increased according to an exponent rule and the index coefficient is about 0.39.Furthermore,the effect of the structure and inlet flow parameters on the separation phenomenon is researched systematically.The oil volume fraction in the down-outlet can be decreased from 8.26%to 0.18%by through the cylindrical cyclone.Moreover,the diameter of the cylinder has a great influence on the separation results,so the dimension of the cylindrical cyclone should be designed for different inlet conditions in order to obtain the optimal separation consequence.There is a best flow split ratio of the cylindrical cyclone for a fixed inlet conditions.

关 键 词：油-水分离 柱型旋流器 数值模拟 流场特征 分离效率 

分 类 号：TE5[石油与天然气工程—油气田开发工程]