喷嘴结构对射流鼓泡反应器混合和传质性能的影响
|
摘要
喷嘴结构对射流鼓泡反应器的混合和传质性能具有重要的影响。以空气-水作为模拟介质,使用双探头电导探针、电解质示踪法和动态溶氧法,对比研究了缩径式圆形喷嘴和旋扭三角形喷嘴对射流鼓泡反应器中气泡尺寸分布、平均气含率、液相混合时间和气液传质系数的影响规律。实验发现,随着气速或液体射流Reynolds数的增大,两种喷嘴对应的平均气含率、液相混合时间和气液传质系数具有相同的变化规律;与缩径式圆形喷嘴相比,采用旋扭三角形喷嘴的射流鼓泡反应器中气泡尺寸更小,平均气含率更高,宏观混合时间更短;当气体输入功占总输入功比例超过20%时,喷嘴结构对气液传质系数的影响较小,当气体输入功占总输入功比例小于20%时,旋扭三角形喷嘴的气液传质性能优于缩径式圆形喷嘴。研究结果可为工业射流鼓泡反应器喷嘴结构的优化提供理论指导。
The nozzle structure has an important influence on the mixing and mass transfer performance of the jet bubbling reactor. In this paper, air-water is used as the simulation medium, and the double-probe conductivity probe, electrolyte tracer method and dynamic dissolved oxygen method are used to compare the bubble size distribution in the jet bubbling reactor with the reduced diameter circular nozzle and the rotary triangular nozzle. The results show that the variation rules of the average gas holdup, the liquid mixing time and the liquid volumetric mass transfer coefficient with the increase of the superficial gas velocity and the liquid jet Reynolds number in the jet bubbling reactors with two kinds of nozzles are the same. Compared with the case with necking circular nozzle, the bubble size is smaller, the average gas holdup is higher and the mixing time is shorter in the case with twisted triangular nozzle. The nozzle structure has little influence on the gas-liquid mass transfer coefficient when the gas input power accounts for more than 20% of the total input power. However, the gas-liquid mass transfer performance of the twisted triangular nozzle is better than that of the necking circular nozzle when the gas input power accounts for less than 20% of the total input power. The research results can provide theoretical guidance for the optimization of the nozzle structure in the industrial jet bubbling reactor.
The nozzle structure has an important influence on the mixing and mass transfer performance of the jet bubbling reactor. In this paper, air-water is used as the simulation medium, and the double-probe conductivity probe, electrolyte tracer method and dynamic dissolved oxygen method are used to compare the bubble size distribution in the jet bubbling reactor with the reduced diameter circular nozzle and the rotary triangular nozzle. The results show that the variation rules of the average gas holdup, the liquid mixing time and the liquid volumetric mass transfer coefficient with the increase of the superficial gas velocity and the liquid jet Reynolds number in the jet bubbling reactors with two kinds of nozzles are the same. Compared with the case with necking circular nozzle, the bubble size is smaller, the average gas holdup is higher and the mixing time is shorter in the case with twisted triangular nozzle. The nozzle structure has little influence on the gas-liquid mass transfer coefficient when the gas input power accounts for more than 20% of the total input power. However, the gas-liquid mass transfer performance of the twisted triangular nozzle is better than that of the necking circular nozzle when the gas input power accounts for less than 20% of the total input power. The research results can provide theoretical guidance for the optimization of the nozzle structure in the industrial jet bubbling reactor.
引文
[1]AMIRI T Y,MOGHADDAS J S,MOGHADDAS Y.A jet mixing study in two phase gas-liquid systems[J].Chemical Engineering Research and Design,2011,89(3A):352-366.
[2]郭天琪,黄正梁,王靖岱,等.射流鼓泡反应器的混合特性[J].化工学报,2015,66(11):4438-4445.GUO T Q,HUANG Z L,WANG J D,et al.Mixing characteristics in jet bubbling reactor[J].CIESC Journal,2015,66(11):4438-4445.
[3]HUANG Z L,WANG H T,SHUAI Y,et al.Hydrodynamics in a jet bubbling reactor:experimental research and mathematical modeling[J].AIChE Journal,2018,64(5):1814-1827.
[4]陈迎.射流鼓泡反应器中液相体积传质系数的测定[J].化学反应工程与工艺,2017,33(3):221-226.CHEN Y.Mass transfer coefficient study of jet bubbling reactor[J].Chemical Reaction and Technology,2017,33(3):221-226.
[5]田艳丽.旋转射流搅拌全流场数值模拟及喷嘴结构优化[D].杭州:浙江大学,2005.TIAN Y L.Numerical simulation on flow field of rotary jet mixing system and nozzle structure optimization[D].Hangzhou:Zhejiang University,2005.
[6]付必伟,赵江,王斌,等.喷嘴结构对射流特性的影响[J].清洗世界,2013,29(1):15-18.FU B W,ZHAO J,WANG B,et al.The influence of nozzle structure on the injection ability[J].Cleaning World,2013,29(1):15-18.
[7]吴德松,廖华林,杨斌.直旋混和射流喷嘴结构参数对流场特性的影响[J].水动力学研究与进展,2014,29(4):421-428.WU D S,LIAO H L,YANG B.Study on the influence of nozzle structural parameters of straight-swirling integrated jet on flow field characteristics[J].Chinese Journal of Hydrodynamics,2014,29(4):421-428.
[8]GUTMARK E J,GRINSTEIN F F.Flow control with noncircular jets[J].Annual Review of Fluid Mechanics,1999,31(1):239-272.
[9]MI J,NATHAN G J.Statistical properties of turbulent free jets issuing from nine differently-shaped nozzles[J].Flow,Turbulence and Combustion,2010,84(4):583-606.
[10]禹言芳,李春晓,孟辉波,等.不同形状喷嘴的射流流动与卷吸特性[J].过程工程学报,2014,14(4):549-555.YU Y F,LI C X,MENG H B,et al.Flow and entrainment properties of the jet with different shapes of nozzles[J].The Chinese Journal of Process Engineering,2014,14(4):549-555.
[11]ZHU Y H,CAI W J,WEN C Y,et al.Numerical investigation of geometry parameters for design of high performance ejectors[J].Applied Thermal Engineering,2009,29:898-905.
[12]BALAMURUGAN S,GAIKAR V G,PATWARDHAN A W.Effect of ejector configuration on hydrodynamic characteristics of gas-liquid ejectors[J].Chemical Engineering Science,2008,63:721-731.
[13]YADAV R L,PATWARDHAN A W.Design aspects of ejectors:effects of suction chamber geometry[J].Chemical Engineering Science,2008,63:3886-3897.
[14]YANG X,LONG X,YAO X.Numerical investigation on the mixing process in a steam ejector with different nozzle structures[J].International Journal of Thermal Science,2012,56:95-106.
[15]别海燕,李春红,安维中,等.喷嘴结构对液-液喷射器性能影响的CFD模拟[J].计算机与应用化学,2016,33(10):1068-1073.BIE H Y,LI C H,AN W Z,et al.CFD simulation of the influence of nozzle structure on the performance of liquid-liquid ejector[J].Computers and Applied Chemistry,2016,33(10):1068-1073.
[16]陈冬林,贠英,米建春,等.菱形自由射流与圆形自由射流流动特性的粒子图像测速研究[J].中国电机工程学报,2012,32(17):76-81.CHEN D L,YUN Y,MI J C,et al.Particle image velocimetry measurements of turbulent jets issuing from diamond and circular orifice plates[J].Proceedings of the CSEE,2012,32(17):76-81.
[17]MI J,NOBES D S,NATHAN G J.Influence of jet exit conditions on the passive scaler field of an axisymmetric free jet[J].Journal of Fluid Mechanics,2001,432:91-125.
[18]XU G,ANTONIA R.Effect of different initial conditions on a turbulent round free jet[J].Physics of Fluids,2008,20(7):075108.
[19]ZUGHBI,HABIB D.Numerical simulation of mixing in a jet agitated horizontal cylindrical tank[J].International Journal of Computational Fluid Dynamics,2006,20(2):127-136.
[20]XU M Y,ZHANG J P,MI J C,et al.PIV measurements of turbulent jets issuing from triangular and circular orifice plates[J].Science China:Physics,Mechanics&Astronomy,2013,56(6):1176-1186.
[21]栾剑,徐敏义,马梓然,等.等腰三角形湍流射流的流动特性实验研究[J].气体物理,2017,2(2):37-46.LUAN J,XU M Y,MA Z R,et al.Experimental investigation of flow characteristics issuing from isosceles triangular orifices[J].Phase of Gases,2017,2(2):37-46.
[22]SCHADOW K C,GUTMARK E,PARR D M,et al.Selective control of flow coherence in triangular jets[J].Experiments in Fluids,2004,6(2):129-135.
[23]IYOGUN C O,BIROUK M.Effect of sudden expansion on entrainment and spreading rates of a jet issuing from asymmetric nozzles[J].Flow Turbulence Combust,2009,82(3):287-315.
[24]DEO R C,NATHAN G J,MI J.The influence of nozzle-exit geometric profile on statistical properties of a turbulent plane jet[J].Experimental Thermal and fluid Science,2007,32(2):545-559.
[25]DEO R C,NATHAN G J,MI J.Comparison of turbulent jets issuing from rectangular nozzles with and without sidewalls[J].Experimental Thermal and Fluid Science,2007,32(2):596-606.
[26]HU H,SAGA T,KOBAYASHI T,et al.A study on a lobed jet mixing flow by using stereoscopic particle image velocimetry technique[J].Physics of Fluids,2001,13(11):3425-3441.
[27]李俊,张庆,周一睁.喷嘴结构对水射流性能影响的分析[J].机械制造与自动化,2015,44(5):102-104.LI J,ZHANG Q,ZHOU Y Z.Analysis of influence of nozzle convergence on water-jet capacity[J].Machinery Manufacturing and Automation,2015,44(5):102-104.
[28]沈娟.高压水射流喷嘴的设计及其结构优化[D].苏州:苏州大学,2014.SHEN J.High pressure water jet nozzle design and structural optimization[D].Suzhou:Soochow University,2014.
[29]贾北华,刘萍,张东速.矩形水射流切割性能的试验研究[J].矿山机械,2004,32(11):74-76.JIA B H,LIU P,ZHANG D S.Experimental study on cutting performance of rectangular water jet[J].Mining&Process Equipment,2004,32(11):74-76.
[30]QUINN W.Measurements in the near flow of an isosceles triangular turbulent free jets[J].Experiments in Fluids,2005,39(1):111-126.
[31]吕术森,陈雪莉,于广锁,等.应用电导探针测定鼓泡塔内气泡参数[J].化学反应工程与工艺,2003,19(4):344-351.LYU S S,CHEN X L,YU G S,et al.Determination of bubble parameters in bubble column by the conductivity probe[J].Chemical Reaction Engineering and Technology,2003,19(4):344-351.
[32]李蒙,王浩同,蒋燕,等.射流鼓泡反应器内气泡分布特性[J].石油化工,2017,46(10):1288-1293.LI M,WANG H T,JIANG Y,et al.Experimental research of the bubble distribution in a jet bubble reactor[J].Petrochemical Technology,2017,46(10):1288-1293.
[2]郭天琪,黄正梁,王靖岱,等.射流鼓泡反应器的混合特性[J].化工学报,2015,66(11):4438-4445.GUO T Q,HUANG Z L,WANG J D,et al.Mixing characteristics in jet bubbling reactor[J].CIESC Journal,2015,66(11):4438-4445.
[3]HUANG Z L,WANG H T,SHUAI Y,et al.Hydrodynamics in a jet bubbling reactor:experimental research and mathematical modeling[J].AIChE Journal,2018,64(5):1814-1827.
[4]陈迎.射流鼓泡反应器中液相体积传质系数的测定[J].化学反应工程与工艺,2017,33(3):221-226.CHEN Y.Mass transfer coefficient study of jet bubbling reactor[J].Chemical Reaction and Technology,2017,33(3):221-226.
[5]田艳丽.旋转射流搅拌全流场数值模拟及喷嘴结构优化[D].杭州:浙江大学,2005.TIAN Y L.Numerical simulation on flow field of rotary jet mixing system and nozzle structure optimization[D].Hangzhou:Zhejiang University,2005.
[6]付必伟,赵江,王斌,等.喷嘴结构对射流特性的影响[J].清洗世界,2013,29(1):15-18.FU B W,ZHAO J,WANG B,et al.The influence of nozzle structure on the injection ability[J].Cleaning World,2013,29(1):15-18.
[7]吴德松,廖华林,杨斌.直旋混和射流喷嘴结构参数对流场特性的影响[J].水动力学研究与进展,2014,29(4):421-428.WU D S,LIAO H L,YANG B.Study on the influence of nozzle structural parameters of straight-swirling integrated jet on flow field characteristics[J].Chinese Journal of Hydrodynamics,2014,29(4):421-428.
[8]GUTMARK E J,GRINSTEIN F F.Flow control with noncircular jets[J].Annual Review of Fluid Mechanics,1999,31(1):239-272.
[9]MI J,NATHAN G J.Statistical properties of turbulent free jets issuing from nine differently-shaped nozzles[J].Flow,Turbulence and Combustion,2010,84(4):583-606.
[10]禹言芳,李春晓,孟辉波,等.不同形状喷嘴的射流流动与卷吸特性[J].过程工程学报,2014,14(4):549-555.YU Y F,LI C X,MENG H B,et al.Flow and entrainment properties of the jet with different shapes of nozzles[J].The Chinese Journal of Process Engineering,2014,14(4):549-555.
[11]ZHU Y H,CAI W J,WEN C Y,et al.Numerical investigation of geometry parameters for design of high performance ejectors[J].Applied Thermal Engineering,2009,29:898-905.
[12]BALAMURUGAN S,GAIKAR V G,PATWARDHAN A W.Effect of ejector configuration on hydrodynamic characteristics of gas-liquid ejectors[J].Chemical Engineering Science,2008,63:721-731.
[13]YADAV R L,PATWARDHAN A W.Design aspects of ejectors:effects of suction chamber geometry[J].Chemical Engineering Science,2008,63:3886-3897.
[14]YANG X,LONG X,YAO X.Numerical investigation on the mixing process in a steam ejector with different nozzle structures[J].International Journal of Thermal Science,2012,56:95-106.
[15]别海燕,李春红,安维中,等.喷嘴结构对液-液喷射器性能影响的CFD模拟[J].计算机与应用化学,2016,33(10):1068-1073.BIE H Y,LI C H,AN W Z,et al.CFD simulation of the influence of nozzle structure on the performance of liquid-liquid ejector[J].Computers and Applied Chemistry,2016,33(10):1068-1073.
[16]陈冬林,贠英,米建春,等.菱形自由射流与圆形自由射流流动特性的粒子图像测速研究[J].中国电机工程学报,2012,32(17):76-81.CHEN D L,YUN Y,MI J C,et al.Particle image velocimetry measurements of turbulent jets issuing from diamond and circular orifice plates[J].Proceedings of the CSEE,2012,32(17):76-81.
[17]MI J,NOBES D S,NATHAN G J.Influence of jet exit conditions on the passive scaler field of an axisymmetric free jet[J].Journal of Fluid Mechanics,2001,432:91-125.
[18]XU G,ANTONIA R.Effect of different initial conditions on a turbulent round free jet[J].Physics of Fluids,2008,20(7):075108.
[19]ZUGHBI,HABIB D.Numerical simulation of mixing in a jet agitated horizontal cylindrical tank[J].International Journal of Computational Fluid Dynamics,2006,20(2):127-136.
[20]XU M Y,ZHANG J P,MI J C,et al.PIV measurements of turbulent jets issuing from triangular and circular orifice plates[J].Science China:Physics,Mechanics&Astronomy,2013,56(6):1176-1186.
[21]栾剑,徐敏义,马梓然,等.等腰三角形湍流射流的流动特性实验研究[J].气体物理,2017,2(2):37-46.LUAN J,XU M Y,MA Z R,et al.Experimental investigation of flow characteristics issuing from isosceles triangular orifices[J].Phase of Gases,2017,2(2):37-46.
[22]SCHADOW K C,GUTMARK E,PARR D M,et al.Selective control of flow coherence in triangular jets[J].Experiments in Fluids,2004,6(2):129-135.
[23]IYOGUN C O,BIROUK M.Effect of sudden expansion on entrainment and spreading rates of a jet issuing from asymmetric nozzles[J].Flow Turbulence Combust,2009,82(3):287-315.
[24]DEO R C,NATHAN G J,MI J.The influence of nozzle-exit geometric profile on statistical properties of a turbulent plane jet[J].Experimental Thermal and fluid Science,2007,32(2):545-559.
[25]DEO R C,NATHAN G J,MI J.Comparison of turbulent jets issuing from rectangular nozzles with and without sidewalls[J].Experimental Thermal and Fluid Science,2007,32(2):596-606.
[26]HU H,SAGA T,KOBAYASHI T,et al.A study on a lobed jet mixing flow by using stereoscopic particle image velocimetry technique[J].Physics of Fluids,2001,13(11):3425-3441.
[27]李俊,张庆,周一睁.喷嘴结构对水射流性能影响的分析[J].机械制造与自动化,2015,44(5):102-104.LI J,ZHANG Q,ZHOU Y Z.Analysis of influence of nozzle convergence on water-jet capacity[J].Machinery Manufacturing and Automation,2015,44(5):102-104.
[28]沈娟.高压水射流喷嘴的设计及其结构优化[D].苏州:苏州大学,2014.SHEN J.High pressure water jet nozzle design and structural optimization[D].Suzhou:Soochow University,2014.
[29]贾北华,刘萍,张东速.矩形水射流切割性能的试验研究[J].矿山机械,2004,32(11):74-76.JIA B H,LIU P,ZHANG D S.Experimental study on cutting performance of rectangular water jet[J].Mining&Process Equipment,2004,32(11):74-76.
[30]QUINN W.Measurements in the near flow of an isosceles triangular turbulent free jets[J].Experiments in Fluids,2005,39(1):111-126.
[31]吕术森,陈雪莉,于广锁,等.应用电导探针测定鼓泡塔内气泡参数[J].化学反应工程与工艺,2003,19(4):344-351.LYU S S,CHEN X L,YU G S,et al.Determination of bubble parameters in bubble column by the conductivity probe[J].Chemical Reaction Engineering and Technology,2003,19(4):344-351.
[32]李蒙,王浩同,蒋燕,等.射流鼓泡反应器内气泡分布特性[J].石油化工,2017,46(10):1288-1293.LI M,WANG H T,JIANG Y,et al.Experimental research of the bubble distribution in a jet bubble reactor[J].Petrochemical Technology,2017,46(10):1288-1293.