隔板和溶气环对油水分离效果影响的数值模拟  

Numerical simulation of the influence of baffle and air dissolving ring on the efficiency of oil-water separation

作　　者：张成玺 尹凝霞[1] 李兴振 程光玮 周炳华 王英 ZHANG Chengxi;YIN Ningxia;LI Xingzhen;CHENG Guangwei;ZHOU Binghua;WANG Ying(School of Mechanical Engineering,Guangdong Ocean University,Zhanjiang 524088,China;China National Offshore Oil Corporation Energy Development Equipment Technology Limited Zhanjiang Branch,Zhanjiang 524057,China)

机构地区：[1]广东海洋大学机械工程学院,湛江524088 [2]中海油能源发展装备技术有限公司湛江分公司,湛江524057

出　　处：《环境工程学报》2024年第12期3433-3444,共12页Chinese Journal of Environmental Engineering

基　　金：海上油气田生产水处理技术研究与应用资助项目(B23364)。

摘　　要：海上油田多数平台采出液依靠现有设备进行处理很难达标排放,急需高效的水处理设备。立式旋流气浮罐的内部结构是提高含油污水处理效率的核心,为了筛选出油水分离效果较好的内部结构,采用数值模拟方法,针对罐体内部有无隔板、隔板的不同孔径、孔间距和孔的排列方式等影响因素,构建了4种不同的结构参数模型,探究其对罐体流场以及油水分离效果的影响。仿真结果表明:工况4中隔板孔的排列方式为圆形的油水分离效果最好,它比工况1中溶气环释放溶气水-带隔板情况下的底部出口(水出口)油相质量浓度减少约15.7 mg∙L^(−1)。由于气浮区即使存在微弱的旋流也会对分离效果产生较为明显的影响,而隔板有助于维持气浮区流场的稳定,因此隔板的设置与优化是提高油水分离效果的主要原因。内筒内旋式、带隔板和增加溶气环对实现含油污水高效分离起到积极作用,为立式旋流气浮罐体内部结构的优化设计提供参考。It is difficult for most offshore oil platforms to treat and discharge produced water up to standards by relying solely on their current facilities.Thus,highly efficient water treatment equipment is urgently needed.The internal structure of vertical hydrocyclone air flotation tank is the key to improving the efficiency of oily water treatment.In order to screen out the internal structure with better oil-water separation effect,numerical simulation methods were used to construct four models with different structural parameters,which were the presence or absence of baffles inside the tank and the aperture diameters,spacings,arrangements of the holes on the baffles,to investigate the influence of these parameters on the flow field of tank and oil-water separating effect.The simulation results indicated that the best oil-water separation effect was achieved when the holes on baffles were arranged according to a circular pattern in working condition 4.Compared to working condition 1,which the dissolved air was released through a dissolved air ring with a baffle in tank,the oil phase mass concentration at the bottom outlet(water outlet)was reduced by approximately 15.7 mg∙L^(−1).Since even slight swirling currents in the air flotation zone could have a significant impact on the separation effect,the baffle helps maintain the stability of the flow field in the air flotation zone.Therefore,the setting and optimization of the baffle was the main reason for improving the oil-water separation effect.Over all,the pattens of internal cylinder swirling type,with baffle presence,and additional dissolved air ring played a positive role in achieving efficient separation of oily wastewater.This study may provide a reference for the optimal design of the internal structure of the vertical cyclonic flotation tank.

关 键 词：立式旋流气浮 油水分离效果 数值模拟 含油污水处理 

分 类 号：X741[环境科学与工程—环境工程]