摘要
为探究旋流喷头除砂过程容器内流场分布特性及流场对除砂能力的影响规律,采用RSM和DPM模型对密闭容器内部流场和颗粒运动轨迹进行了数值模拟。研究结果表明,压降从20 kPa增大到45 kPa时,容器内部旋流稳定性逐渐增强,容器中心颗粒质量分数不断增大,逃逸颗粒中大颗粒质量分数逐步增大;压降从45 kPa增大到100 kPa时,旋流稳定性减弱,逃逸颗粒中大颗粒质量分数小幅度下降,压降为45 kPa时旋流喷头能够以较低的能耗实现最佳的除砂效果。在旋流喷头中心管下端添加挡板可以有效减弱下游旋流切向速度,对旋流稳定性和轴向速度影响较小,有效提高了喷头对大颗粒的清除效率;挡板间隙h=15 mm时相比h=5 mm时整体旋流切向速度更小,对大颗粒的清除效果更高。喷头安装高度从100 mm下降到50 mm的过程中,喷头下方切向速度增大,喷头对大颗粒的清除能力减弱;安装高度为25 mm时喷头足够接近容器底部,中心轴向速度增大,喷头对大颗粒的清除能力激增。所得结论可为旋流喷头的操作参数、结构优化及安装位置确定提供数据参考。
In order to investigate the distribution of flow field in a container during desanding process of swirl nozzle and the influence of the flow field on the desanding capacity,RSM and DPM models were used to numerically simulate the flow field and particle movement trajectory in the closed container.The results show that as the pressure drop increases from 20 kPa to 45 kPa,the swirl stability in the container gradually increases,the mass fraction of particles in the center of the container continues to increase,and the mass fraction of large particles in the escaping particles gradually increases.As the pressure drop increases from 45 kPa to 100 kPa,the swirl stability weakens,and the mass fraction of large particles in the escaping particles decreases slightly.When the pressure drop is 45 kPa,the best desanding effect is achieved with lower energy consumption.The addition of baffle at the lower end of central tube of the swirl nozzle effectively weakens the tangential velocity of the downstream swirl,with little impact on the swirl stability and axial velocity,effectively improving the efficiency of the nozzle in removing large particles.When the baffle gap is h=15 mm,the overall tangential velocity of swirl is smaller compared to h=5 mm,having higher removal effect of large particles.During the process of reducing the installation height of the nozzle from 100 mm to 50 mm,the tangential velocity below the nozzle increases,and the nozzle's ability to remove large particles weakens.When the installation height is 25 mm,the nozzle is close enough to the bottom of the container,the central axial velocity increases,and the nozzle's ability to remove large particles sharply increases.The research conclusions provide data reference for the operation parameters,structural optimization and installation position determination of the swirl nozzle.
作者
武晓建
宋健斐
陈建义
刘博文
Wu Xiaojian;Song Jianfei;Chen Jianyi;Liu Bowen(College of Mechanical and Transportation Engineering,China University of Petroleum(Beijing);Beijing Key Laboratory of Process Fluid Filtration and Separation;Shandong Institute of Petroleum and Chemical Technology)
出处
《石油机械》
北大核心
2024年第11期122-129,共8页
China Petroleum Machinery
基金
碳中和联合研究院自主基金项目“基于页岩油的三相分离器流场调控与性能优化”(CNIF20230306)。
关键词
密闭容器除砂
旋流喷头
水力冲砂
三相分离器
DPM模型
挡板
数值模拟
desanding in closed container
swirl nozzle
hydraulic sand washing
three-phase separator
DPM model
baffle
numerical simulation
