叶片式入口分离器气液流动及分离性能数值模拟
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摘要
叶片式分离器是一种较新颖的气液两相流设备的入口分离及布气装置。为了给设计提供指导,本文采用离散相模型对其中的气液两相流动过程进行模拟,并通过分离效率测试对计算模型进行了验证;在此基础上研究了气速、液滴粒径、叶片倾角及流道入口宽度对分离性能的影响。结果表明:叶片式分离器具有良好的气液分离性能,对于粒径大于50μm的液滴分离效率能够达到85%以上,增大气速和液滴粒径有利于提高叶片式入口装置的分离效率;综合考虑分离效率和压降,叶片倾角宜设置为5～8°;在现有流道宽度设计建议的范围内,减小流道宽度可显著提高小液滴分离效率,但阻力也将增加。
The vane separator is a noveltyseparation and distribution inlet device for gas-liquid two-phase flow equipment. To provide guide for the design of vane separator, a numerical method based on the Discrete PhaseModel was successfully applied to simulate gas-liquid two-phase flow in vane separator, and gas-liquid separation experiment was done to validate the numerical simulation method. Furthermore, the effects of gas velocity, droplet diameter, angle and width of vane flow passage on separation performance were numerically investigated. The results show that separation efficiency of vane separator is above 85% for droplets with diameter bigger than 50μm,and it increases rapidly with increasing of droplet diameter or gas velocity. Good separation performance was obtained when the vane angle is 5～8°. Meanwhile, in certain range, reducing spacing of vane can effectively improve the separation efficiency of droplets with diameter smaller than 30μm, but its resistance also increases.
The vane separator is a noveltyseparation and distribution inlet device for gas-liquid two-phase flow equipment. To provide guide for the design of vane separator, a numerical method based on the Discrete PhaseModel was successfully applied to simulate gas-liquid two-phase flow in vane separator, and gas-liquid separation experiment was done to validate the numerical simulation method. Furthermore, the effects of gas velocity, droplet diameter, angle and width of vane flow passage on separation performance were numerically investigated. The results show that separation efficiency of vane separator is above 85% for droplets with diameter bigger than 50μm,and it increases rapidly with increasing of droplet diameter or gas velocity. Good separation performance was obtained when the vane angle is 5～8°. Meanwhile, in certain range, reducing spacing of vane can effectively improve the separation efficiency of droplets with diameter smaller than 30μm, but its resistance also increases.
引文
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[13]金向红,金有海,王建军,等.改进气液旋流器排气管结构的实验及CFD模拟研究[J].高校化学工程学报,2011,25(2):205-211.
[14]Venkatesan G,Kulasekharan N,Iniyan S.Influence of turbulence models on the performance prediction of flow through curved vane demisters[J].Desalination,2013,329(22):19-28.
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[17]樊玉光,张立峰,袁淑霞,等.板间距和倾角对波纹板分离性能影响的数值模拟[J].石油化工设备,2015,(2):18-22.
[18]李嘉.波形板汽水分离器的理论与实验研究[D].武汉:华中科技大学,2007:14.
[2]孙立强,王迪,朱红波,等.三相分离器设计及CFD模拟研究进展[J].石油化工设备技术,2017,38(4):6-12.
[3]郭树平,吴家祥,于勇,等.油气水三相分离器的研究进展[J].石油机械,2016,44(9):104-108.
[4]Mosca G,Schaeffer P,Griepsma B.The new schoepentoeter*plus:a step ahead in the bulk separation of gas-liquid mixtures[C]//AICHE Spring Meeting and Global Congress on Process Safety,2011.
[5]Pham H H,Lim Y I,Han S,et al.Hydrodynamics and design of gas distributor in large-scale amine absorbers using computational fluid dynamics[J].Korean Journal of Chemical Engineering,2018,35(5):1-10.
[6]曾江涛,干爱华,马双玉,等.双列叶片式气体分布器的研究[J].石油化工设计,2009,26(4):16-18.
[7]Wehrli M,Hirschberg S,Schweizer R.Influence of vapour feed design on the flow distribution below packings[J].Chemical Engineering Research&Design,2003,81(1):116-121.
[8]李旭光,干爱华,于斌.双列叶片式气体分布器内流场的CFD模拟[J].化工进展,2007,26(S1):124-126.
[9]杜明,张敏华,李海燕,等.TEG脱水塔内气体分布器流场FLU-ENT数值模拟[J].石油和化工设备,2012,15(1):18-21.
[10]Qaroot Y F,Kharoua N,Khezzar L.Discrete phase modeling of oil droplets in the gas compartment of a production separator[C]//ASME2014 International Mechanical Engineering Congress and Exposition,Montreal,Quebec,Canada:2014:(7):V7T-V9T.
[11]KharouaN,Khezzar L,Saadawi H N H.Application of CFD to debottleneck production separators in a major oil field in the middle east[C]//SPE Annual Technical Conference And Exhibition,San Antonio,Texas,USA:2012.
[12]Venkatesan G,Kulasekharan N,Iniyan S.Numerical analysis of curved vane demisters in estimating water droplet separation efficiency[J].Desalination,2014,339(339):40-53.
[13]金向红,金有海,王建军,等.改进气液旋流器排气管结构的实验及CFD模拟研究[J].高校化学工程学报,2011,25(2):205-211.
[14]Venkatesan G,Kulasekharan N,Iniyan S.Influence of turbulence models on the performance prediction of flow through curved vane demisters[J].Desalination,2013,329(22):19-28.
[15]Ghaffarkhah A,Shahrabi M A,Moraveji M K,et al.Application of CFD for designing conventional three phase oilfield separator[J].Egyptian JournalofPetroleum,2016,26(2).
[16]J sang A I,Numerical and experimental studies of droplet-gas flow[D].Norway:Telemark University College,2002:20.
[17]樊玉光,张立峰,袁淑霞,等.板间距和倾角对波纹板分离性能影响的数值模拟[J].石油化工设备,2015,(2):18-22.
[18]李嘉.波形板汽水分离器的理论与实验研究[D].武汉:华中科技大学,2007:14.
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