组合导向浮阀塔板的雾沫夹带实验及CFD模拟
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摘要
对组合导向浮阀塔板进行了水力学实验,测定了2块直径1m、不同浮阀排布的组合导向浮阀塔板的雾沫夹带和相关水力学数据。根据实验塔板的结构和尺寸参数建立几何模型,采用Fluent 6.3.26软件对板上气液两相流动进行CFD模拟,考察了塔板上的气液两相流动状况。清液层高度和雾沫夹带的模拟结果与实验结果吻合较好,验证了模拟的准确性。对两块不同浮阀排布的组合导向浮阀塔板的雾沫夹带和板上液体反向流进行了分析,结果表明在适当位置用导向能力更强的梯形浮阀代替矩形浮阀可有效降低雾沫夹带率和液体反向流比例,雾沫夹带率的实验值和模拟值分别降低了13.4%和10.6%,液体反向流比例降低了12.8%。研究结果表明,通过CFD模拟可望指导两种浮阀的合理排布和塔板的优化设计。
Hydraulic experiments were carried out on two types of combined directed valve tray. The entrainment and related hydraulics data of two 1 m diameter trays with different float valve arrangement were measured. The geometric model was established according to the structural and size parameters of experimental trays and the flow field of combined directed valve tray was simulated with Fluent 6.3.26,and the flow pattern characteristics was investigated. The simulation results of clear liquid height and entrainment agreed well with experimental data, which proved the validity of simulation. The entrainment and liquid backflow of two trays were analyzed and the results showed that the entrainment and liquid backflow could be efficiently decreased by properly arranging trapezoidal float valves with stronger oriented ability instead of rectangular float valves on tray. The average entrainment of experimental and simulation results decreased by 13.4% and 10.6%, respectively, while the average of backflow ratio decreased by 12.8%. This research results showed that CFD simulation was expected to provide a guidance for arrangement of two types of float valve and optimization design of the tray.
Hydraulic experiments were carried out on two types of combined directed valve tray. The entrainment and related hydraulics data of two 1 m diameter trays with different float valve arrangement were measured. The geometric model was established according to the structural and size parameters of experimental trays and the flow field of combined directed valve tray was simulated with Fluent 6.3.26,and the flow pattern characteristics was investigated. The simulation results of clear liquid height and entrainment agreed well with experimental data, which proved the validity of simulation. The entrainment and liquid backflow of two trays were analyzed and the results showed that the entrainment and liquid backflow could be efficiently decreased by properly arranging trapezoidal float valves with stronger oriented ability instead of rectangular float valves on tray. The average entrainment of experimental and simulation results decreased by 13.4% and 10.6%, respectively, while the average of backflow ratio decreased by 12.8%. This research results showed that CFD simulation was expected to provide a guidance for arrangement of two types of float valve and optimization design of the tray.
引文
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[4]刘继东,田志亮,郭艾慷,等.立体喷射型塔板的性能比较[J].现代化工, 2014, 34(8):145-150.LIU J D, TIAN Z L, GUO A K, et al. Performance comparison of the solid jet type tray[J]. Modern Chemical Industry, 2014, 34(8):145-150.
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[13] MA Y, JI L J, Zhang J X, et al. CFD gas-liquid simulation of oriented valve tray[J]. Chinese Journal of Chemical Engineering, 2015, 23(10):1603-1609.
[14]刘江琳,张杰旭,纪利俊,等.组合导向浮阀塔板的CFD模拟及反向流分析[J].化工学报, 2016, 67(5):1701-1709.LIU J L, ZHANG J X, JI L J, et al. CFD simulation and backflow analysis of combined directed valve tray[J]. CIESC Journal, 67(5):1701-1709.
[15] GESIT G, NANDAKUMAR K, CHUANG K T. CFD modeling of flow patterns and hydraulics of commercial-scale sieve trays[J]. AIChE Journal, 2003, 49(4):910-924.
[16] JIANG B, LIU P, ZHANG L, et al. Hydrodynamics and mass-transfer analysis of a distillation ripple tray by computational fluid dynamics simulation[J]. Industrial&Engineering Chemistry Research, 2013, 52(49):17618-17626.
[17] ISHII M. Two-fluid model for two-phase flow[J]. Multiphase Science&Technology, 1990, 5:1-4.
[18] BENNETT D L, AGRAWAL R, COOK P J. New pressure drop correlation for sieve tray distillation columns[J]. AIChE Journal, 1983,29(3):434-442.
[19] COLWELL C J. Clear liquid height and froth density on sieve trays[J].Industrial&Engineering Chemistry Process Design&Development,1981, 20(2):298-307.
[20] BATEN J V, KRISHNA R. Modelling sieve tray hydraulics using computational fluid dynamics[J]. Chemical Engineering Journal, 2000,77(3):143-151.
[21] LI Q S, LI L, ZHANG M X, et al. Modeling flow-guided sieve tray hydraulics using computational fluid dynamics[J]. Industrial&Engineering Chemistry Research, 2014, 53(11):4480-4488.
[22] KRISHNA R, BATEN J V. CFD simulations of sieve tray hydrodynamics[J]. Chemical Engineering Research&Design, 1999,77(7):639-646.
[23] LI X G, LIU D X, XU S M, et al. CFD simulation of hydrodynamics of valve tray[J]. Chemical Engineering&Processing Process Intensification, 2009, 48(1):145-151.
[24] NORILER D, BARROS A C, MACIEL M R W, et al. Simultaneous momentum, mass and energy transfer analysis of a distillation sieve tray using CFD techniques:prediction of efficiencies[J]. Industrial&Engineering Chemistry Research, 2010, 49(14):6599-6611.
[25]何杰,王昕,俞旭峰,等.低雾沫导向梯形固定阀塔板流体力学性能[J].化学工程, 2015, 43(7):39-43.HE J, WANG X, YU X F, et al. Hydrodynamic performance of trapezoid directed fixed valve tray with low entrainment[J]. Chemical Engineering, 2015, 43(7):39-43.
[2]余国琮,黄洁.大型塔板的模拟与板效率的研究(Ⅰ)——不均匀速度场的涡流扩散模型[J].化工学报, 1981, 32(1):11-19.YU Kuo-tsung T, HUANG Jie. Simulation and efficiency of large tray(I)[J]. Journal of Chemical Industry and Engineering(China), 1981, 32(1):11-19.
[3]付有成,王崇智.板式塔精馏技术进展[J].石化技术及应用, 2000,18(4):231-236.FU Y C, WANG C Z. Progress in rectification technology of tray column[J]. Petrochemical Technology&Application, 2000, 18(4):231-236.
[4]刘继东,田志亮,郭艾慷,等.立体喷射型塔板的性能比较[J].现代化工, 2014, 34(8):145-150.LIU J D, TIAN Z L, GUO A K, et al. Performance comparison of the solid jet type tray[J]. Modern Chemical Industry, 2014, 34(8):145-150.
[5]路秀林,赵培.导向浮阀塔板[J].化学工程, 1992(3):41-46.LU X L, ZHAO P. Directed floating valve trays[J]. Chemical Engineering, 1992(3):41-46.
[6]张杰旭,赵培,李玉安,等.组合导向浮阀塔板的开发研究[J].化工进展, 2005, 24(s1):69-72.ZHANG J X, ZHAO P, LI Y A, et al. Development and research of combined directed valve tray[J]. Chemical Industry and Engineering Progress, 2005, 24(s1):69-72.
[7] JACIMOVIC B M. Entrainment effect on tray efficiency[J]. Chemical Engineering Science, 2000, 55(18):3941-3949.
[8]张秋香,张婧,赵培.波纹导向浮阀塔板的雾沫夹带研究[J].现代化工, 2016(9):146-149.ZHANG Q X, ZHANG J, ZHAO P, et al. Performance comparison of the solid jet type tray[J]. Modern Chemical Industry, 2016(9):146-149.
[9] HUNT C, WILKE C R. Capacity factors in the performance of perforated-plate columns[J]. AIChE Journal, 1995(1):441-456.
[10] CHENG S I, TELLER A J. Free entrainment behavior in sieve trays[J]. AIChE Journal, 2010, 7(2):282-287.
[11]黄洁,余国琮,刘海玲.筛板雾沫夹带二维分布的研究[J].化工学报, 1989, 40(4):430-437.HUANG Jie, YU Kuo-tsung, LIU Hailing. Research of twodimensional distribution of entrainment of sieve plate[J]. Journal of Chemical Industry and Engineering(China), 1989, 40(4):430-437.
[12] JIANG S, HONG G, SUN J S, et al. Modeling fixed triangular valve tray hydraulics using computational fluid dynamics[J]. Chemical Engineering&Processing Process Intensification, 2012, 52(2):74-84.
[13] MA Y, JI L J, Zhang J X, et al. CFD gas-liquid simulation of oriented valve tray[J]. Chinese Journal of Chemical Engineering, 2015, 23(10):1603-1609.
[14]刘江琳,张杰旭,纪利俊,等.组合导向浮阀塔板的CFD模拟及反向流分析[J].化工学报, 2016, 67(5):1701-1709.LIU J L, ZHANG J X, JI L J, et al. CFD simulation and backflow analysis of combined directed valve tray[J]. CIESC Journal, 67(5):1701-1709.
[15] GESIT G, NANDAKUMAR K, CHUANG K T. CFD modeling of flow patterns and hydraulics of commercial-scale sieve trays[J]. AIChE Journal, 2003, 49(4):910-924.
[16] JIANG B, LIU P, ZHANG L, et al. Hydrodynamics and mass-transfer analysis of a distillation ripple tray by computational fluid dynamics simulation[J]. Industrial&Engineering Chemistry Research, 2013, 52(49):17618-17626.
[17] ISHII M. Two-fluid model for two-phase flow[J]. Multiphase Science&Technology, 1990, 5:1-4.
[18] BENNETT D L, AGRAWAL R, COOK P J. New pressure drop correlation for sieve tray distillation columns[J]. AIChE Journal, 1983,29(3):434-442.
[19] COLWELL C J. Clear liquid height and froth density on sieve trays[J].Industrial&Engineering Chemistry Process Design&Development,1981, 20(2):298-307.
[20] BATEN J V, KRISHNA R. Modelling sieve tray hydraulics using computational fluid dynamics[J]. Chemical Engineering Journal, 2000,77(3):143-151.
[21] LI Q S, LI L, ZHANG M X, et al. Modeling flow-guided sieve tray hydraulics using computational fluid dynamics[J]. Industrial&Engineering Chemistry Research, 2014, 53(11):4480-4488.
[22] KRISHNA R, BATEN J V. CFD simulations of sieve tray hydrodynamics[J]. Chemical Engineering Research&Design, 1999,77(7):639-646.
[23] LI X G, LIU D X, XU S M, et al. CFD simulation of hydrodynamics of valve tray[J]. Chemical Engineering&Processing Process Intensification, 2009, 48(1):145-151.
[24] NORILER D, BARROS A C, MACIEL M R W, et al. Simultaneous momentum, mass and energy transfer analysis of a distillation sieve tray using CFD techniques:prediction of efficiencies[J]. Industrial&Engineering Chemistry Research, 2010, 49(14):6599-6611.
[25]何杰,王昕,俞旭峰,等.低雾沫导向梯形固定阀塔板流体力学性能[J].化学工程, 2015, 43(7):39-43.HE J, WANG X, YU X F, et al. Hydrodynamic performance of trapezoid directed fixed valve tray with low entrainment[J]. Chemical Engineering, 2015, 43(7):39-43.