提升管出口SVQS自然旋风长度的数值模拟
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摘要
采用RNG k-ε湍流模型对一套?600 mm×4150 mm的SVQS旋流快分装置的气相流场及自然旋风长度进行了模拟研究。结果表明,SVQS旋风尾涡的截面位置与隔流筒下端面最大切向速度衰减达88%时的截面位置相吻合,并据此定义了SVQS的自然旋风长度。基于SVQS旋流快分切向速度的分布规律发现,SVQS的自然旋风长度随喷口气速的增加和汽提气速的减小而逐渐增大。参照旋风分离器自然旋风长度的计算方法,基于SVQS旋流快分的结构特点及模拟计算结果,提出了提升管出口SVQS旋流快分自然旋风长度的计算关系式。
To optimize the cylinder height of the closing section, the gas phase flow field and the natural vortex length in a ?600 mm×4150 mm super vortex quick separation(SVQS) system were simulated by using the RNG k-ε turbulent model. The simulation results show that the cross-section location of the vortex end was agreeable to that of 88% attenuation of the maximum tangential velocity in the entrance section of flow partition column, which hence defined the natural vortex length. From the tangential velocity distribution of gas phase in SVQS, the natural vortex length of the quick separation was found to increase with the increase of spout velocity and the decrease of stripping velocity. Based on the numerical simulation and structural characteristics of SVQS, an equation for calculating the natural vortex length in SVQS was developed.
To optimize the cylinder height of the closing section, the gas phase flow field and the natural vortex length in a ?600 mm×4150 mm super vortex quick separation(SVQS) system were simulated by using the RNG k-ε turbulent model. The simulation results show that the cross-section location of the vortex end was agreeable to that of 88% attenuation of the maximum tangential velocity in the entrance section of flow partition column, which hence defined the natural vortex length. From the tangential velocity distribution of gas phase in SVQS, the natural vortex length of the quick separation was found to increase with the increase of spout velocity and the decrease of stripping velocity. Based on the numerical simulation and structural characteristics of SVQS, an equation for calculating the natural vortex length in SVQS was developed.
引文
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[16]王福军.计算流体动力学分析——CFD软件原理与应用[M].北京:清华大学出版社,2009:122-125.WANG F J.Computational Hydrodynamics Analysis—CFD Software Theory and Application[M].Beijing:Tsinghua University Press,2009:122-125.
[17]王江云,毛羽,刘美丽,等.用改进的RNG k-ε模型模拟旋风分离器内的强旋流动[J].石油学报(石油加工),2010,26(1):8-13.DOI:10.3969/j.issn.1001-8719.2010.01.002.WANG J Y,MAO Y,LIU M L,et al.Numerical simulation of strongly swirling flow in cyclone separator by using an advanced RNG k-εmodel[J].Acta Petrolei Sinica(Petroleum Processing Section),2010,26(1):8-13.DOI:10.3969/j.issn.1001-8719.2010.01.002.
[18]程兆龙,姚秀颖,鄂承林,等.带隔流筒旋流快分系统新型工业催化裂化沉降器内气相流场的数值模拟[J].过程工程学报,2016,16(1):86-95.CHENG Z L,YAO X Y,E C L,et al.Numerical simulation of gas phase flow field in a novel FCC disengager with flow partition cylinder quick separation system[J].The Chinese Journal of Process Engineering,2016,16(1):86-95.
[19]宋健斐,魏耀东,时铭显.蜗壳式旋风分离器内气相流场非轴对称特性分析[J].化工学报,2007,58(5):1091-1096.SONG J F,WEI Y D,SHI M X.Analysis of asymmetry of gas phase flow field in volute cyclone[J].Journal of Chemical Industry and Engineering(China),2007,58(5):1091-1096.
[20]WEI Y D,SONG J F,SHI M X,et al.Numerical simulation of the asymmetry of gas-phase flow field in a volute cyclone separator[J].Progress in Natural Science,2005,15:98-104.
[2]孙凤侠,卢春喜,时铭显.旋流快分器内气相流场的实验与数值模拟研究[J].石油大学学报(自然科学版),2005,29(3):106-111.DOI:10.3321/j.issn:1000-5870.2005.03.024.SUN F X,LU C X,SHI M X.Experiment and numerical simulation of gas flow field in new vortex quick separation system[J].Journal of the University of Petroleum,2005,29(3):106-111.DOI:10.3321/j.issn:1000-5870.2005.03.024.
[3]孙凤侠,卢春喜,时铭显.催化裂化沉降器新型高效旋流快分器内气固两相流动[J].化工学报,2005,56(12):2280-2287.SUN F X,LU C X,SHI M X.Numerical simulation of gas particles flow field in new vortex quick separation system of FCC disengage[J].Journal of Chemical Industry and Engineering(China),2005,56(12):2280-2287.
[4]孙凤侠,卢春喜,时铭显.催化裂化沉降器新型高效旋流快分器的结构优化与分析[J].中国石油大学学报(自然科学版),2007,31(5):109-113.DOI:10.3321/j.issn:1000-5870.2007.05.024.SUN F X,LU C X,SHI M X.Configuration optimization and analysis of newly developed vortex quick separator for FCC disengage[J].Journal of China University of Petroleum(Natural Science Edition),2007,31(5):109-113.DOI:10.3321/j.issn:1000-5870.2007.05.024.
[5]胡艳华,汪洋,卢春喜,等.催化裂化提升管出口旋流快分系统内隔流筒结构的优化改进[J].石油学报(石油加工),2008,24(2):177-183.DOI:10.3969/j.issn.1001-8719.2008.02.010.HU Y H,WANG Y,LU C X,et al.Improvement of the isolate cylinder in vortex quick separation system at FCCU riser outlet[J].Acta Petrolei Sinica(Petroleum Processing Section),2008,24(2):177-183.DOI:10.3969/j.issn.1001-8719.2008.02.010.
[6]ALEXANDER R M.Fundamentals of cyclone design and operation[J].Proceedings of the Australia Institute of Minerals and Metals(New Series),1949,152(3):203-228.
[7]LEITH D,LICTH W.The collection efficiency of cyclone type particle collectors:a new theoretical approach[J].AICh E Symp.Series,1972,68(126):196-206.
[8]DIETZ P W.Collection efficiency of cyclone separators[J].AICh E Journal,1981,27(27):888-892.
[9]HOFFMANN A C,JONEGE R D,ARENDS H,et al.Evidence of the natural vortex length and its effect on the separation efficiency of gas cyclones[J].Filtration&Separation,1995,32(8):799-804.
[10]BRYANT H S,SILVERMAN R M,ZENE F A.How dust in gas affects cyclone pressure drop[J].Hydrocarbon Processing,1983,62(6):87-90.
[11]姬忠礼,吴小林,时铭显.旋风分离器自然旋风长的实验研究[J].石油学报(石油加工),1993,9(4):86-91.JI Z L,WU X L,SHI M X.Experimental research on the natural turning length in the cyclone[J].Acta Petrolei Sinica(Petroleum Processing Section),1993,9(4):86-91.
[12]杜德喜,朱丽娟,董秀奇.CFD模拟旋风分离器自然旋风长[J].矿山机械,2007,35(4):94-96.DU D X,ZHU L J,DONG X Q.Simulation to the length of the natural vortex in cyclone separator with CFD[J].Mining&Processing Equipment,2007,35(4):94-96.
[13]高翠芝,孙国刚,董瑞倩.旋风分离器旋风长度的分析计算[J].石油学报(石油加工),2012,28(1):94-98.DOI:10.3969/j.issn.1001-8719.2012.01.017.GAO C Z,SUN G G,DONG R Q.Analysis calculation of the vortex length in a gas cyclone[J].Acta Petrolei Sinica(Petroleum Processing Section),2012,28(1):94-98.DOI:10.3969/j.issn.1001-8719.2012.01.017.
[14]魏耀东,张静,宋健斐,等.旋风分离器自然旋风长的实验研究[J].热能动力工程,2010,25(2):206-210.WEI Y D,ZHANG J,SONG J F,et al.Experimental study of the natural cyclone length of a cyclone separator[J].Journal of Engineering for Thermal Energy and Power,2010,25(2):206-210.
[15]钱付平,章名耀.基于响应曲面法旋风分离器的自然旋风长[J].东南大学学报(自然科学版),2006,36(2):247-251.DOI:10.3321/j.issn:1001-0505.2006.02.014.QIAN F P,ZHANG M Y.Natural vortex lengths of cyclone separators based on response surface methodology[J].Journal of Southeast University(Natural Science Edition),2006,36(2):247-251.DOI:10.3321/j.issn:1001-0505.2006.02.014.
[16]王福军.计算流体动力学分析——CFD软件原理与应用[M].北京:清华大学出版社,2009:122-125.WANG F J.Computational Hydrodynamics Analysis—CFD Software Theory and Application[M].Beijing:Tsinghua University Press,2009:122-125.
[17]王江云,毛羽,刘美丽,等.用改进的RNG k-ε模型模拟旋风分离器内的强旋流动[J].石油学报(石油加工),2010,26(1):8-13.DOI:10.3969/j.issn.1001-8719.2010.01.002.WANG J Y,MAO Y,LIU M L,et al.Numerical simulation of strongly swirling flow in cyclone separator by using an advanced RNG k-εmodel[J].Acta Petrolei Sinica(Petroleum Processing Section),2010,26(1):8-13.DOI:10.3969/j.issn.1001-8719.2010.01.002.
[18]程兆龙,姚秀颖,鄂承林,等.带隔流筒旋流快分系统新型工业催化裂化沉降器内气相流场的数值模拟[J].过程工程学报,2016,16(1):86-95.CHENG Z L,YAO X Y,E C L,et al.Numerical simulation of gas phase flow field in a novel FCC disengager with flow partition cylinder quick separation system[J].The Chinese Journal of Process Engineering,2016,16(1):86-95.
[19]宋健斐,魏耀东,时铭显.蜗壳式旋风分离器内气相流场非轴对称特性分析[J].化工学报,2007,58(5):1091-1096.SONG J F,WEI Y D,SHI M X.Analysis of asymmetry of gas phase flow field in volute cyclone[J].Journal of Chemical Industry and Engineering(China),2007,58(5):1091-1096.
[20]WEI Y D,SONG J F,SHI M X,et al.Numerical simulation of the asymmetry of gas-phase flow field in a volute cyclone separator[J].Progress in Natural Science,2005,15:98-104.