油滴聚并破碎行为对水力旋流器分离性能的影响
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摘要
为研究离散相油滴聚并破碎行为对旋流器分离性能的影响,以轴入导锥式旋流器为研究对象,将单一的混合模型与加载了群体平衡模型(PBM)的混合模型模拟结果进行对比。模拟结果显示:耦合模型模拟结果可以确定出油滴的破碎位置主要发生在螺旋流道及旋流器的近壁区域,并在轴心油核区油滴粒度分布较大,出现明显的聚并现象;耦合模型得出的分离效率随着入口进液量的提高呈现出先升高后降低的趋势,单一混合模型模拟得出的分离效率随着进液量的增加逐渐升高;两种模拟方法得出的速度场分布几乎无差别,但随着溢流分流比的增大分别呈现出极大值点不同的先升高后降低的趋势。所得结论可为提高水力旋流器数值模拟的准确性提供参考。
To study the effects of coalescence and breakup behavior of discrete phase oil droplet on the internal flow field characteristics and separation performance of oil-water separation hydrocyclone, taking the axial guide cone hydrocyclone as study object, the simulation results of the single Mixture model and the mixed model loaded with the Population Balance Model(PBM) is compared. The numerical simulation results show that, the simulation results of the PBM-Mixture coupling model reveal that the breakup position of the oil droplets mainly occurs in the near-wall region of the spiral flow channel and the hydrocyclone. The oil droplet size is large in the axial oil core region where obvious coalescence phenomenon is observed. The separation efficiency obtained by the coupling model increases first and then decreases with the increase of the inlet liquid volume. While the separation efficiency obtained by the single Mixture model increases with the inlet liquid volume. There is almost no difference in the velocity field distribution by the two simulation methods. But with the increase of the overflow split ratio, the rise and fall trend with different points of local maximum is presented. The study can provide a reference for improving the accuracy of numerical simulation of hydrocyclone.
To study the effects of coalescence and breakup behavior of discrete phase oil droplet on the internal flow field characteristics and separation performance of oil-water separation hydrocyclone, taking the axial guide cone hydrocyclone as study object, the simulation results of the single Mixture model and the mixed model loaded with the Population Balance Model(PBM) is compared. The numerical simulation results show that, the simulation results of the PBM-Mixture coupling model reveal that the breakup position of the oil droplets mainly occurs in the near-wall region of the spiral flow channel and the hydrocyclone. The oil droplet size is large in the axial oil core region where obvious coalescence phenomenon is observed. The separation efficiency obtained by the coupling model increases first and then decreases with the increase of the inlet liquid volume. While the separation efficiency obtained by the single Mixture model increases with the inlet liquid volume. There is almost no difference in the velocity field distribution by the two simulation methods. But with the increase of the overflow split ratio, the rise and fall trend with different points of local maximum is presented. The study can provide a reference for improving the accuracy of numerical simulation of hydrocyclone.
引文
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[17] 李枫,肖广阔,马志权,等.操作参数对脱水型旋流器性能的影响[J].油气田地面工程,2014,33(4):26-27.LI F,XIAO G K,MA Z Q,et al.Influence of operating parameters on the performance of dewatering cyclone[J].Oil-gas Field Surface Engineering,2014,33(4):26-27.
[18] 张勇,邢雷,蒋明虎,等.离散相粒径对旋流器分离性能的影响[J].东北石油大学学报,2018,42(2):109-116,124.ZHANG Y,XING L,JIANG M H,et al.Effects of discrete phase particle size on hydrocyclone separation performance[J].Journal of Northeast Petroleum University,2018,42(2):109-116,124.
[2] 陆耀军.液-液旋流分离技术综述[J].石油学报,1997,18(1):99-105.LU Y J.Review of liquid-liquid hydrocyclone separation technology[J].Acta Petrolei Sinica,1997,18(1):99-105.
[3] 王尊策,赵立新,李枫,等.液-液水力旋流器流场特性与分离特性研究(四)——锥角变化对压力损失的影响[J].化工装备技术,1999,20(6):5-7.WANG Z C,ZHAO L X,LI F,et al.Study on flow field characteristics and separation characteristics of liquid-liquid hydrocyclones (IV)—effect of cone angle change on pressure loss[J].Chemical Equipment Technology,1999,20(6):5-7.
[4] 李枫,刘冠男.水力旋滤器分离性能研究[J].化工机械,2008,35(1):7-9.LI F,LIU G N.Saparation characteristics study om hydrocyclone filters[J].Chemical Engineering & Machinery,2008,35(1):7-9.
[5] 徐保蕊,蒋明虎,张晓光,等.采出液中固相颗粒对三相分离器性能的影响[J].中国粉体技术,2016,22(3):5-12.XU B R,JIANG M H,ZHANG X G,et al.Effect of solid phase particles on performance of three phase separator[J].China Powered Science and Technology,2016,22(3):5-12.
[6] 崔宝玉.水力旋流器流场及分离过程的数值试验研究[D].沈阳:东北大学,2014.CUI B Y.Numerical study on flow field and separating process of hydrocyclone[D].Shenyang:Northeastern University,2014.
[7] 蒋明虎,王和静,邢雷,等.轴入导锥式水力旋流器分离性能研究[J].石油机械,2017,45(10):86-91.JIANG M H,WANG H J,XING L,et al.Study on separation performance of axial guide cone hydrocyclone[J].China Petroleum Machinery,2017,45(10):86-91.
[8] 邢雷,张勇,蒋明虎,等.轴入式两级串联旋流器流场分析与性能评估[J].中国机械工程,2018,29(16):1927-1935.XING L,ZHANG Y,JIANG M H,et al.Flow filed analysis and performance evaluation on axis“in dual” stage tandem hydrocyclones[J].China Mechanical Engineering,2018,29(16):1927-1935.
[9] 胡大鹏,王荧光,任文文,等.导流锥式超声速旋流分离装置流动特性[J].化工学报,2016,67(6):2417-2424.HU D P,WANG Y G,REN W W,et al.Flow characteristic of supersonic gas separator with diversion cone[J].CIESC Journal,2016,67(6):2417-2424.
[10] 邢雷.旋流场内离散相油滴运移轨迹研究[D].大庆:东北石油大学,2016.XING L.Mechanism and experimental study on trajectory of discrete phase oil droplet in vortex field[D].Daqing:Northeast Petroleum University,2016.
[11] 刘琳,赵立新,刘海旭,等.溢流循环水力旋流器流场特性的数值分析[J].化学工程,2017,45(10):48-53,61.LIU L,ZHAO L X,LIU H X,et al.Numerical simulation analysis of flow field characteristics for overflow-circle hydrocyclone[J].Chemical Engineering (China),2017,45(10):48-53,61.
[12] 李少伟,景山,张琦.萃取柱内液-液两相流CFD-PBM模拟研究进展[J].过程工程学报,2012,12(4):702-711.LI S W,JING S,ZHANG Q,et al.Advances in simulation of liquid-liquid two-phase flow in extraction columns with CFD-PBM[J].The Chinese Journal of Process Engineering,2012,12(4):702-711.
[13] 安杉,陈家庆,蔡小垒,等.T型管内油水分离特性的CFD-PBM数值模拟[J].化工学报,2017,68(4):1326-1335.AN S,CHEN J Q,CAI X L,et al.CFD-PBM numerical simulation of oil-water separation performance inside T junction[J].CIESC Journal,2017,68(4):1326-1335.
[14] LUO H,SVENDSEN H F.Theoretical model for drop and bubble break up in turbulent dispersions [J].Aiche Journal,1996,42(5):1225-1233.
[15] PRINCE M J,BLANCH H W.Bubble coalescence and break-up in air-sparged bubble columns [J].Aiche Journal,2010,36(10):1485-1499.
[16] COULALOGLOU C A,TAVLARIDES L L.Description of interaction processes in agitated liquid-liquid dispersions[J].Chem.Eng.Sci.,1977,32(11):1289-1297.
[17] 李枫,肖广阔,马志权,等.操作参数对脱水型旋流器性能的影响[J].油气田地面工程,2014,33(4):26-27.LI F,XIAO G K,MA Z Q,et al.Influence of operating parameters on the performance of dewatering cyclone[J].Oil-gas Field Surface Engineering,2014,33(4):26-27.
[18] 张勇,邢雷,蒋明虎,等.离散相粒径对旋流器分离性能的影响[J].东北石油大学学报,2018,42(2):109-116,124.ZHANG Y,XING L,JIANG M H,et al.Effects of discrete phase particle size on hydrocyclone separation performance[J].Journal of Northeast Petroleum University,2018,42(2):109-116,124.