不同结构的旋风分离器二次涡的数值模拟和分析
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摘要
以Stairmand旋风分离器、扩散式旋风分离器和环流式旋风分离器为研究对象,采用CFD软件Fluent提供的湍流雷诺应力模型(RSM),研究了内部构件对旋风分离器内二次涡的影响,模拟结果表明:环流式旋风分离器内部导流件有效降低了"上灰环"和"短路流",与另两种旋风分离器相比,筒体顶盖及排气管附近二次涡速度分别从23.6和32.1 m×s~(-1)降至10.2和25.7 m×s~(-1),湍动强度分别由2.38%和3.41%减弱到1.61%和2.39%,筒体顶盖涡流尺度的比例因数由0.25减小为0.11。扩散式旋风分离器的反射屏对于削弱"二次扬尘"现象和"颗粒夹带"的影响效果显著,与Stairmand旋风分离器相比,排尘口附近二次涡速度由25.1降至7.3 m×s~(-1),尺度的比例因数、湍动强度均显著降低。结果表明通过合理的增设内部构件对分离器内流场进行导流,可降低二次涡对于流场的影响。
Effects of internal components on secondary vortex in cyclone separators were simulated by Fluent software using Reynolds stress model(RSM). Stairmand cyclone separator, diffusible cyclone separator and circumfluent cyclone separator were used as the investigation objects. The results show that the internal deflector of the circumfluent cyclone separator can effectively reduce "upper dust ring" and "short circuit flow" effects when compared with the other two cyclones. The velocities of secondary vortex at the top of the cylinder and the exhaust pipe are reduced from 23.6 m×s~(-1) and 32.1 m×s~(-1) to 10.2 m×s~(-1) and 25.7 m×s~(-1), respectively, while the turbulence intensity is reduced from 2.38% and 3.41% to 1.61% and 2.39%, respectively. The eddy scale factor at the top of the cylinder is reduced from 0.25 to 0.11. Reflective screen in the diffusible cyclone separator can significantly reduce "secondary dust" and "particle entrainment" effects, and the velocity of secondary vortex at the discharge port is reduced from 25.1 m×s~(-1) to 7.3 m×s~(-1) when compared with Stairmand cyclone separator. The scale factor and the turbulence intensity of the vortex are significantly reduced. The research shows that the influence of secondary vortex on the flow field can be reduced by rationally adding internal components to divert flow fields in the separator.
Effects of internal components on secondary vortex in cyclone separators were simulated by Fluent software using Reynolds stress model(RSM). Stairmand cyclone separator, diffusible cyclone separator and circumfluent cyclone separator were used as the investigation objects. The results show that the internal deflector of the circumfluent cyclone separator can effectively reduce "upper dust ring" and "short circuit flow" effects when compared with the other two cyclones. The velocities of secondary vortex at the top of the cylinder and the exhaust pipe are reduced from 23.6 m×s~(-1) and 32.1 m×s~(-1) to 10.2 m×s~(-1) and 25.7 m×s~(-1), respectively, while the turbulence intensity is reduced from 2.38% and 3.41% to 1.61% and 2.39%, respectively. The eddy scale factor at the top of the cylinder is reduced from 0.25 to 0.11. Reflective screen in the diffusible cyclone separator can significantly reduce "secondary dust" and "particle entrainment" effects, and the velocity of secondary vortex at the discharge port is reduced from 25.1 m×s~(-1) to 7.3 m×s~(-1) when compared with Stairmand cyclone separator. The scale factor and the turbulence intensity of the vortex are significantly reduced. The research shows that the influence of secondary vortex on the flow field can be reduced by rationally adding internal components to divert flow fields in the separator.
引文
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[11]XU Wei-wei(许伟伟),JIN You-hai(金有海),WANG Jian-jun(王建军),et al.Researches on the non-main stream flow in tangential inlet cyclone separators(直切式旋风分离器内非主流流动的研究)[J].Chemical Engineering&Machinery(化工机械),2010,37(3):273-277.
[12]DUAN Ji-hai(段继海),WU Kai(吴凯),CHEN Guang-hui(陈光辉),et al.High-efficiency Stairmand cyclone flow diversion and drainage(高效Stairmand型旋风分离器流场导流与引流)[J].Journal of Chemical Engineering of Chinese Universities(高校化学工程学报),2016,30(1):26-32.
[13]TAN Hui-min(谭慧敏),WANG Jian-jun(王建军),MA Yan-jie(马艳杰),et al.Analysis of the influence of dust discharge cone geometry on the gas-solid flow field in tangential inlet cyclone separator(排尘锥结构对旋风分离器内气固两相分离性能影响的研究)[J].Journal of Chemical Engineering of Chinese Universities(高校化学工程学报),2011,25,(4):590-596
[14]TAN Xiao-jun(谭晓军).Numerical simulation of two-phase flow in diffusion cyclone separator(扩散式旋风分离器两相流动数值模拟研究)[D].Hangzhou(杭州):Zhejiang University(浙江大学),2006.
[15]LI Jian-long(李建隆),WANG Wei-wen(王伟文),LIU Ji-quan(刘继泉).Circumfluent cyclone separator(环流式旋风除尘器).CN,ZL02270076.5,[P].2003-10-08.
[16]Roache P J.Computation fluid dynamics[M].Albuquerque:Hermosa Pub,1972.
[17]GAO Guo-hua(高国华).Study on Two-phase flow problem in chemical process by using CFD method(应用CFD方法对化工过程两相流问题的研究)[D].Tianjin(天津):Tianjin University(天津大学),2008.
[18]WANG Wei-wen(王伟文),ZHAO Fu-bao(赵付宝),CHEN Guang-hui(陈光辉),et al.Guiding and commutating of cyclone flow field(旋风流场的导流与整流)[J].Chemical Engineering(China)(化学工程),2009,37(6):24-27.
[19]Felten F,Fautrelle Y,Du Terrail Y,et al.Numerical modeling of electrogetically-riven turbulent flows using LES methods[J].Applied Mathematical Modelling,2004,28(1):15-27.
[20]Lee Y.A Study and improvement of large eddy simulation for practical applications[D].Texas:Texas&M University,1992.
[21]GU Xin-chun(谷新春),WANG Wei-wen(王伟文),WANG Li-xin(王立新),et al.Numerical simulation of flow field in circumfluent cyclone separator(环流式旋风除尘器内流场的数值模拟)[J].Journal of Chemical Engineering of Chinese Universities(高校化学工程学报),2007,21(3):411-416.
[22]LIU Shu-yan(刘淑艳),ZHANG Ya(张雅),WANG Bao-guo(王保国).Cyclone separator three-dimensional turbulent flow-field simulation using the reynolds stress model(用RSM模拟旋风分离器内的三维湍流流场)[J].Transactions of Beijing Institute of Technology(北京理工大学学报),2005,25(5):377-379
[23]SONG Jian-fei(宋健斐),WEI Yao-dong(魏耀东),SHI Ming-xian(时铭显).Asymmetry of gas-phase flow field in cyclone separator(蜗壳式旋风分离器气相流场的非轴对称特性的模拟)[J].CIESC Journal(化工学报),2005,56(8):1397-1402
[24]WANG Fu-jun(王福军).Computational fluid dynamic analysis(计算机流体动力学分析)[M].Beijing(北京):Tsinghua Press(清华大学出版社),2004.
[25]Fluent,FLUENT 6.3 user guide,Fluent Incorporated,Lebanon;2006.
[26]MAN Xiao-wei(满晓伟).Study on the performance of a new type of DC guide vane(新型直流导叶式旋风管的性能研究)[D].Qingdao(青岛):China University of Petroleum(East China)(中国石油大学(华东)),2011.
[27]ZHAO Xin-xue(赵新学),JIN You-hai(金有海),MENG Yu-qing(孟玉青),et al.Numerical analysis on the erosion of cyclone separator′s surface wall(旋风分离器壁面磨损的数值分析)[J].Fluid Machinery(流体机械),2010,38(4):18-22.
[28]HUANG Xin-wei(黄星玮),QIAN Fu-ping(钱付平).Effect of the improvement of inlet geometry of cyclone aeparators on ahortcut dlow eate(旋风分离器入口结构改进及其对短路流量的影响)[J].Journal of Filtration&Separation(过滤与分离),2008,18(1):8-10.
[29]PANG Xin-xin(庞新新),XIANG Xiao-dong(向晓东),CHEN Bao-zhi(陈宝智).Influence of the dust re-entrainment on the cyclone collection efficiency and the strategy(二次扬尘对旋风器除尘效率影响分析与对策)[J].Journal of Wuhan University of Science and Technology(武汉科技大学学报(自然科学版)),2001,24(3):253-256.
[2]SONG Jian-fei(宋建斐),WEI Yao-dong(魏耀东),SHI Ming-xian(时铭显).Analysis of asymmetry of gas-phase flow field in volute cyclone(蜗壳式旋风分离器内气相流场非轴对称特性分析)[J].Journal of Chemical Industry and Engineering(China)(化工学报),2007,58(5):1091-1096.
[3]Safikhani H,Akhavan-Behabadi M,Shams M,et al.Numerical simulation of flow field in three types of standard cyclone separators[J].Advanced Powder Technology,2010,21(4):435-442.
[4]WU Xiao-lin(吴小林),SHI Ming-xian(时铭显),CAO Ying(曹颖).Investigation on the precessing vortex core in cyclone separators(旋风分离器内旋进涡核现象及其对分离性能的影响分析)[J].The Chinese Journal of Process Engineering(过程工程学报),2002,2(增刊):427-430.
[5]Bernardo S,Mori M,Peres A,et al.3-D computational fluid dynamics for gas and gas-particle flows in a cyclone with different inlet section angles[J].Powder Technology,2006,162(3):190-200.
[6]Wang W W,Zhang P,Wang L X,et al.Structure and performance of the circumfluent cyclone[J].Powder Technology,2010,200(3):158-163
[7]LIU Cheng-wen(刘成文),WANG Lian-ze(王连泽),WANG Jian-jun(王建军),et al.Effect of a reducing pressure drop stick in the flow field of a cyclone separator(减阻杆对旋风分离器流场特性的影响)[J].Journal of Tsinghua University(Science and Technology)(清华大学学报(自然科学版)),2007,47(2):293-296.
[8]SONG Jian-fei(宋健斐),WEI Yao-dong(魏耀东),SHI Ming-xian(时铭显).Study on asymmetry of gas flow field in cyclone separator(旋风分离器内流场的非轴对称性特点)[J].The Chinese Journal of Process Engineering(过程工程学报),2004,(Z1):62-66.
[9]CEN Ke-fa(岑可法),NI Ming-hong(倪明红),YAN Jian-hua(严建华),et al.Theory and technology of gas-solid separation(气固分离理论及技术)[M].Hangzhou(杭州):Zhejiang University Press(浙江大学出版社),1999.
[10]XUE Xiao-hu(薛晓虎),WEI Yao-dong(魏耀东),SUN Guo-gang(孙国刚),et al.Numerical simulation on the secondary eddies in upper space of cyclone ceparator(旋风分离器上部空间各种二次涡的数值模拟)[J].Journal of Engineering Thermophysics(工程热物理学报),2005,26(2):243-245.
[11]XU Wei-wei(许伟伟),JIN You-hai(金有海),WANG Jian-jun(王建军),et al.Researches on the non-main stream flow in tangential inlet cyclone separators(直切式旋风分离器内非主流流动的研究)[J].Chemical Engineering&Machinery(化工机械),2010,37(3):273-277.
[12]DUAN Ji-hai(段继海),WU Kai(吴凯),CHEN Guang-hui(陈光辉),et al.High-efficiency Stairmand cyclone flow diversion and drainage(高效Stairmand型旋风分离器流场导流与引流)[J].Journal of Chemical Engineering of Chinese Universities(高校化学工程学报),2016,30(1):26-32.
[13]TAN Hui-min(谭慧敏),WANG Jian-jun(王建军),MA Yan-jie(马艳杰),et al.Analysis of the influence of dust discharge cone geometry on the gas-solid flow field in tangential inlet cyclone separator(排尘锥结构对旋风分离器内气固两相分离性能影响的研究)[J].Journal of Chemical Engineering of Chinese Universities(高校化学工程学报),2011,25,(4):590-596
[14]TAN Xiao-jun(谭晓军).Numerical simulation of two-phase flow in diffusion cyclone separator(扩散式旋风分离器两相流动数值模拟研究)[D].Hangzhou(杭州):Zhejiang University(浙江大学),2006.
[15]LI Jian-long(李建隆),WANG Wei-wen(王伟文),LIU Ji-quan(刘继泉).Circumfluent cyclone separator(环流式旋风除尘器).CN,ZL02270076.5,[P].2003-10-08.
[16]Roache P J.Computation fluid dynamics[M].Albuquerque:Hermosa Pub,1972.
[17]GAO Guo-hua(高国华).Study on Two-phase flow problem in chemical process by using CFD method(应用CFD方法对化工过程两相流问题的研究)[D].Tianjin(天津):Tianjin University(天津大学),2008.
[18]WANG Wei-wen(王伟文),ZHAO Fu-bao(赵付宝),CHEN Guang-hui(陈光辉),et al.Guiding and commutating of cyclone flow field(旋风流场的导流与整流)[J].Chemical Engineering(China)(化学工程),2009,37(6):24-27.
[19]Felten F,Fautrelle Y,Du Terrail Y,et al.Numerical modeling of electrogetically-riven turbulent flows using LES methods[J].Applied Mathematical Modelling,2004,28(1):15-27.
[20]Lee Y.A Study and improvement of large eddy simulation for practical applications[D].Texas:Texas&M University,1992.
[21]GU Xin-chun(谷新春),WANG Wei-wen(王伟文),WANG Li-xin(王立新),et al.Numerical simulation of flow field in circumfluent cyclone separator(环流式旋风除尘器内流场的数值模拟)[J].Journal of Chemical Engineering of Chinese Universities(高校化学工程学报),2007,21(3):411-416.
[22]LIU Shu-yan(刘淑艳),ZHANG Ya(张雅),WANG Bao-guo(王保国).Cyclone separator three-dimensional turbulent flow-field simulation using the reynolds stress model(用RSM模拟旋风分离器内的三维湍流流场)[J].Transactions of Beijing Institute of Technology(北京理工大学学报),2005,25(5):377-379
[23]SONG Jian-fei(宋健斐),WEI Yao-dong(魏耀东),SHI Ming-xian(时铭显).Asymmetry of gas-phase flow field in cyclone separator(蜗壳式旋风分离器气相流场的非轴对称特性的模拟)[J].CIESC Journal(化工学报),2005,56(8):1397-1402
[24]WANG Fu-jun(王福军).Computational fluid dynamic analysis(计算机流体动力学分析)[M].Beijing(北京):Tsinghua Press(清华大学出版社),2004.
[25]Fluent,FLUENT 6.3 user guide,Fluent Incorporated,Lebanon;2006.
[26]MAN Xiao-wei(满晓伟).Study on the performance of a new type of DC guide vane(新型直流导叶式旋风管的性能研究)[D].Qingdao(青岛):China University of Petroleum(East China)(中国石油大学(华东)),2011.
[27]ZHAO Xin-xue(赵新学),JIN You-hai(金有海),MENG Yu-qing(孟玉青),et al.Numerical analysis on the erosion of cyclone separator′s surface wall(旋风分离器壁面磨损的数值分析)[J].Fluid Machinery(流体机械),2010,38(4):18-22.
[28]HUANG Xin-wei(黄星玮),QIAN Fu-ping(钱付平).Effect of the improvement of inlet geometry of cyclone aeparators on ahortcut dlow eate(旋风分离器入口结构改进及其对短路流量的影响)[J].Journal of Filtration&Separation(过滤与分离),2008,18(1):8-10.
[29]PANG Xin-xin(庞新新),XIANG Xiao-dong(向晓东),CHEN Bao-zhi(陈宝智).Influence of the dust re-entrainment on the cyclone collection efficiency and the strategy(二次扬尘对旋风器除尘效率影响分析与对策)[J].Journal of Wuhan University of Science and Technology(武汉科技大学学报(自然科学版)),2001,24(3):253-256.
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