超重力水力聚结分离器流场分析与性能评估
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摘要
采用离散相模型以脱油型水力旋流器为研究对象,分析了不同粒径油滴粒子在旋流场内的运移轨迹,得出随着粒径的增大旋流器的粒级效率逐渐升高。基于油滴运移轨迹设计了一种水力聚结旋流分离装置,可在旋流分离前端通过水力聚结使小颗粒油滴聚并成大颗粒油滴,进而增强旋流分离性能。开展室内试验对水力聚结分离器的分离性能和适用性进行验证。结果表明:粒径在100～900μm范围内随着油滴粒径的逐渐增大,旋流分离效率逐渐升高;水力聚结器可在油滴进入旋流分离器前使油滴碰撞聚结致使离散相油滴粒径分布增大,从而提高旋流器分离效率,其最佳入口进液量在4. 12m~3/h左右,最佳分流比为20%。
Through adopting discrete particle model and taking de-oiling hydrocyclone as the object of study,the migration trajectory of the oil particles with different particle sizes in the cyclone field was analyzed to show that the grade efficiency rose gradually with the increase of particle sizes; based on the oil migration trajectory,a hydraulic coalescing separator was designed to coalesce oil droplets of small particles into those with larger particles ahead of the hydrocyclone separation so as to increase the hydrocyclone separation performance. The laboratory experiments show that,the separation efficiency becomes gradually increased with the increase of oil droplet size in the range of 100μm to 900μm; the coalescence device can make oil droplets gathered together ahead of the hydrocyclone separation and can make the particle size distribution of the oil droplets with discrete phase increased and the separation efficiency improved together with a hydrocyclone's optimal inlet flow rate of about 4. 12 m~3/h and a 20% optimal split ratio.
Through adopting discrete particle model and taking de-oiling hydrocyclone as the object of study,the migration trajectory of the oil particles with different particle sizes in the cyclone field was analyzed to show that the grade efficiency rose gradually with the increase of particle sizes; based on the oil migration trajectory,a hydraulic coalescing separator was designed to coalesce oil droplets of small particles into those with larger particles ahead of the hydrocyclone separation so as to increase the hydrocyclone separation performance. The laboratory experiments show that,the separation efficiency becomes gradually increased with the increase of oil droplet size in the range of 100μm to 900μm; the coalescence device can make oil droplets gathered together ahead of the hydrocyclone separation and can make the particle size distribution of the oil droplets with discrete phase increased and the separation efficiency improved together with a hydrocyclone's optimal inlet flow rate of about 4. 12 m~3/h and a 20% optimal split ratio.
引文
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[7]陆耀军,周力行,沈熊.油滴在液-液旋流分离中的随机轨道数值模拟[J].力学学报,1999,31(5):513~520.
[8]杨雪龙,王永,冯靖,等.水滴粒径对旋叶式汽水分离器性能的影响[J].原子能科学技术,2016,50(12):2200~2205.
[9]Cui R,Wang G H,Li M L.Size Dependent Flow Behaviors of Particles in Hydrocyclone Based on Multiphase Simulation[J].Transactions of Nonferrous Metals Society of China,2015,(25):2422~2428.
[10]赵文君,赵立新,徐保蕊,等.聚结-旋流分离装置流场特性的数值模拟分析研究[J].流体机械,2015,43(7):22~26.
[11]蒋明虎,邢雷,张勇.离散相运移轨迹的新型旋流入口结构设计[J].流体机械,2017,45(10):42~45.
[2]Li S H,Yang S,Yang H R,et al.Particle Holdup and Average Residence Time in the Cyclone of a CFB Boiler[J].Chemical Engineering&Technology,2008,31(2):224~230.
[3]张勇,邢雷,张艳,等.离散相入射位置对旋流器分离性能的影响研究[J].高校化学工程学报,2017,31(6):1311~1317.
[4]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.
[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.
[6]马艺,金有海,王振波.不同参数下旋流器内油滴运动的模拟研究[J].石油机械,2010,38(4):12~15.
[7]陆耀军,周力行,沈熊.油滴在液-液旋流分离中的随机轨道数值模拟[J].力学学报,1999,31(5):513~520.
[8]杨雪龙,王永,冯靖,等.水滴粒径对旋叶式汽水分离器性能的影响[J].原子能科学技术,2016,50(12):2200~2205.
[9]Cui R,Wang G H,Li M L.Size Dependent Flow Behaviors of Particles in Hydrocyclone Based on Multiphase Simulation[J].Transactions of Nonferrous Metals Society of China,2015,(25):2422~2428.
[10]赵文君,赵立新,徐保蕊,等.聚结-旋流分离装置流场特性的数值模拟分析研究[J].流体机械,2015,43(7):22~26.
[11]蒋明虎,邢雷,张勇.离散相运移轨迹的新型旋流入口结构设计[J].流体机械,2017,45(10):42~45.