基于分流分相法的环壁多窄缝取样器设计
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摘要
受气液两相流流动的复杂性影响,传统的两相流计量方式难以保证计量精度。在分流分相法的基础上,提出了流型调整、均匀取样、压力调节相结合的取样方法,设计加工了一种环壁多窄缝小比例取样器,运用CFD仿真软件Eulerian-Eulerian方法确定了取样位置,分析了两相流在取样器中的流动特性,并通过实验研究了不同气、液相折算速度与入口流型对取样器工作效果的影响。研究结果表明:本文设计的取样器工作范围为气相折算速度3～18 m/s,液相折算速度0.05～0.33 m/s,气液相分流系数接近理论值0.167,气液相计量误差均小于±5%。本文设计的环壁多窄缝取样器无运动部件、体积紧凑、所需分离装置体积小,可代替传统的分配计量装置,对实现两相流的精确计量具有重要意义。
Due to the complexity of gas-liquid two-phase flow, the traditional two-phase flow measurement method is difficult to guarantee the accuracy. On the basis of the extraction and separation method, the method of "flow pattern adjustment" combined with "uniform sampling" and "pressure adjustment" is proposed, and a new type of pipe-around multi-slot sampling device is designed. The sampling location is determined and the flow characteristics are analyzed by Eulerian-Eulerian method using CFD simulation software. The effects of different gas, liquid superficial velocities and different flow patterns are studied through experiments to evaluate the working efficiency of the sampling device. The results show that the working range of the sampling device at gas superficial velocity is 3～18 m/s, and that at liquid superficial velocity is 0.05～0.33 m/s. The gas and liquid extraction ratio is close to the theoretical value 0.167 and gas-liquid flow rate measurement error is less than ±5%. The device has no moving part, and it requires separation device with small volume, which can replace the traditional distribution metering device. This device has great significance for the accurate measurement of two-phase flow.
Due to the complexity of gas-liquid two-phase flow, the traditional two-phase flow measurement method is difficult to guarantee the accuracy. On the basis of the extraction and separation method, the method of "flow pattern adjustment" combined with "uniform sampling" and "pressure adjustment" is proposed, and a new type of pipe-around multi-slot sampling device is designed. The sampling location is determined and the flow characteristics are analyzed by Eulerian-Eulerian method using CFD simulation software. The effects of different gas, liquid superficial velocities and different flow patterns are studied through experiments to evaluate the working efficiency of the sampling device. The results show that the working range of the sampling device at gas superficial velocity is 3～18 m/s, and that at liquid superficial velocity is 0.05～0.33 m/s. The gas and liquid extraction ratio is close to the theoretical value 0.167 and gas-liquid flow rate measurement error is less than ±5%. The device has no moving part, and it requires separation device with small volume, which can replace the traditional distribution metering device. This device has great significance for the accurate measurement of two-phase flow.
引文
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[16] 孙媛,曹学文,梁法春,等.气液两相流管束分离器数值模拟与实验验证[J].油气储运,2018,37(8):885-890.SUN Yuan,CAO Xuewen,LIANG Fachun,et al.Numerical simulation and experimental verification of a gas-liquid two-phase flow tube separator[J].Oil & Gas Storage and Transportation,2018,37(8):885-890.
[17] 梁法春,杨桂云,王金龙,等.气液两相流多喷嘴分流取样计量研究[J].中国石油大学学报(自然科学版),2014,38(4):143-147.LIANG Fachun,YANG Guiyun,WANG Jinlong,et al.Gas-liquid two-phase flow metering using multi-nozzle sampler[J].Journal of China University of Petroleum(Edition of Natural Science),2014,38(4):143-147.
[18] 梁法春,王栋,杨桂云,等.气液两相流临界分配特性及相分离控制[J].西安交通大学学报,2015,49(1):53-58.LIANG Fachun,WANG Dong,YANG Guiyun,et al.Gas-liquid two-phase flow critical distribution characteristics and phase splitting control[J].Journal of Xi’an Jiaotong University,2015,49(1):53-58.
[19] LIN Zonghu.Two-phase flow measurements with sharp-edged orifices[J].International Journal of Multiphase Flow,1982,8(6):683-693.
[2] 谢晓庆,康晓东,曾杨,等.海上油田不同开发方式组合模式探讨[J].中国海上油气,2017,29(4):85-90.DOI:1.11935/J.issn.1673-1506.2017.04.010.XIE Xiaoqing,KANG Xiaodong,ZENG Yang,et al.Discussion of different development combination modes in offshore oilfield[J].China Offshore Oil and Gas,2017,29(4):85-90.DOI:1.11935/J.issn.1673-1506.2017.04.010.
[3] AZZOPARDI B J.Phase separation at T junctions[J].Multiphase Science and Technology,1999,11(4):122-129.
[4] WANG Dong,TAN Jianping,ZHANG Xingkai,et al.High pressure steam-water two-phase flow measurements by flow division and separation method[J].Experimental Thermal & Fluid Science,2013,44(1):468-474.
[5] 罗小明,杜雪麟,薛振兴,等.T形多分支管结构参数对气液分离特性的影响[J].石油学报(石油加工),2017,33(3):556-562.LUO Xiaoming,DU Xuelin,XUE Zhenxing,et al.Impact of structural parameters on the separation characteristics of gas-liquid two-phase mixture in combined T-junctions[J].Acta Petrolei Sinica(Petroleum Processing Section),2017,33(3):556-562.
[6] ZHENG Nan,ZHAO Li,HWANG Yunho,et al.Experimental study on two-phase separation performance of impacting T-junction[J].International Journal of Multiphase Flow,2016,83:172-182.
[7] MONRóS-ANDREU G,MARTíNEZ-CUENCA R,TORRó S,et al.Local parameters of air-water two-phase flow at a vertical T-junction[J].Nuclear Engineering & Design,2016,312:303-316.
[8] GUPTA B,NAYAK A K,KANDAR T K,S NAIR.Investigation of air–water two phase flow through a venturi[J].Experimental Thermal & Fluid Science,2016,70:148-154.
[9] MAHDI Y,DAOUD K,TADRIST L.Two-phase flow patterns and size distribution of droplets in a microfluidic T-junction:Experimental observations in the squeezing regime[J].Comptes Rendus Mécanique,2017,345(4):259-270.
[10] LI Hongwei,LI Jiwei,ZHOU Yunlong,et al.Phase split characteristics of slug and annular flow in a dividing micro-T-junction[J].Experimental Thermal & Fluid Science,2017,80:244-258.
[11] MAK C Y,OMEBERE-IYARI N K,AZZOPARDI B J.The split of vertical two-phase flow at a small diameter T-junction[J].Chemical Engineering Science,2006,61(19):6261-6272.
[12] LIANG Fachun,SONG Lianmin,SUN Yuan.An experimental investigation of phase separation of gas-liquid two-phase flow through a small break[J].Chemical Engineering Research and Design,2015,102:161-170.
[13] 王栋,林益,林宗虎.转鼓分流分相式气液两相流体流量测量技术研究[J].西安交通大学学报,2002,36(5):457-460.WANG Dong,LIN Yi,LIN Zonghu.Extracting and separating method type gas-liquid two-phase flow meter by using rotational drum as distributor[J].Journal of Xi’an Jiaotong University,2002,36(5):457-460.
[14] 王栋,张修刚,梁法春,等.基于分时原理的多相流体比例分配方法[J].工程热物理学报,2005,26(增刊1):101-104.WANG Dong,ZHANG Xiugang,LIANG Fachun,et al.Proportional multiphase flow division by time sharing[J].Journal of Engineering Thermophysics,2005,26(S1):101-104.
[15] 梁法春,陈婧,王栋,等.基于分时原理的气液两相流量测量[J].中国石油大学学报(自然科学版),2008,32(4):95-98.LIANG Fachun,CHEN Jing,WANG Dong,et al.Gas-liquid two-phase flow metering by time-sharing method[J].Journal of China University of Petroleum (Edition of Natural Science),2008,32(4):95-98.
[16] 孙媛,曹学文,梁法春,等.气液两相流管束分离器数值模拟与实验验证[J].油气储运,2018,37(8):885-890.SUN Yuan,CAO Xuewen,LIANG Fachun,et al.Numerical simulation and experimental verification of a gas-liquid two-phase flow tube separator[J].Oil & Gas Storage and Transportation,2018,37(8):885-890.
[17] 梁法春,杨桂云,王金龙,等.气液两相流多喷嘴分流取样计量研究[J].中国石油大学学报(自然科学版),2014,38(4):143-147.LIANG Fachun,YANG Guiyun,WANG Jinlong,et al.Gas-liquid two-phase flow metering using multi-nozzle sampler[J].Journal of China University of Petroleum(Edition of Natural Science),2014,38(4):143-147.
[18] 梁法春,王栋,杨桂云,等.气液两相流临界分配特性及相分离控制[J].西安交通大学学报,2015,49(1):53-58.LIANG Fachun,WANG Dong,YANG Guiyun,et al.Gas-liquid two-phase flow critical distribution characteristics and phase splitting control[J].Journal of Xi’an Jiaotong University,2015,49(1):53-58.
[19] LIN Zonghu.Two-phase flow measurements with sharp-edged orifices[J].International Journal of Multiphase Flow,1982,8(6):683-693.