自吸气浮选机模拟研究
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摘要
为加深对自吸气浮选机槽体内的流场结构及性能参数的认识,运用CFD仿真技术对自吸气浮选机槽内气-液两相流进行了模拟研究。以实验室JJF-0. 2 m~3自吸气浮选机为原型进行仿真建模,采用六面体网格对整个模型进行网格划分的网格数量为1. 6×10~6。采用Euler-Euler双流体模型对气-液两相流进行稳态模拟仿真,运输方程的计算运用商业软件ANSYS-FLUENT软件。自吸气浮选机的吸气速率不能预先设定,需要通过模拟结果给出。我们设定气相为单一粒径的气泡,直径为1 mm。模拟过程中监测了叶轮区的气含率及功耗,结果表明浮选机处于良好的操作状态。分析了槽内不同区域的气含率云图及速矢量图,对自吸气浮选机内的流场有一个直观的认识。
The gas-liquid two-phase flow in the tank of self-aeration flotation cell was simulated by CFD simulation technology. The geometric model is a replica of a laboratory JJF-0. 2 m~3 flotation cell and contents a 10-blade rotor,a stator,a dispersion,a standpipe,a draft tube and a tank body. The number of grids for the entire model is 1. 6 × 10~6. Euler-Euler model was employed to simulate the steady state of gas-liquid two-phase flow. the transport equation was calculated by commercial software ANSYS-fluent. The air flow rate of self-aeration flotation cell can not be known in advance,and it should be given by simulation results. Uniform mean bubble diameter of 1. 0 mm has been specified as an input for the simulation. Air volume fraction in rotor and power consumption have been monitored with time,the results indicated that the flotation cell was in a stably operation state. Air volume fraction contours and velocity field in different regions of the machine are presented,thus we will have an intuitive understanding of the flow field in the self-aeration flotation cell.
The gas-liquid two-phase flow in the tank of self-aeration flotation cell was simulated by CFD simulation technology. The geometric model is a replica of a laboratory JJF-0. 2 m~3 flotation cell and contents a 10-blade rotor,a stator,a dispersion,a standpipe,a draft tube and a tank body. The number of grids for the entire model is 1. 6 × 10~6. Euler-Euler model was employed to simulate the steady state of gas-liquid two-phase flow. the transport equation was calculated by commercial software ANSYS-fluent. The air flow rate of self-aeration flotation cell can not be known in advance,and it should be given by simulation results. Uniform mean bubble diameter of 1. 0 mm has been specified as an input for the simulation. Air volume fraction in rotor and power consumption have been monitored with time,the results indicated that the flotation cell was in a stably operation state. Air volume fraction contours and velocity field in different regions of the machine are presented,thus we will have an intuitive understanding of the flow field in the self-aeration flotation cell.
引文
[1]沈政昌,陈建华.浮选机流场模拟及其应用[M].北京:科学出版社,2012:45.
[2]刘文婷.新型浮选机数值模拟研究[D].天津:河北工业大学,2011.
[3]KUMARESAN T,JOSHI JB.Effect of impeller design on the flow pattern and mixing in stirred tanks[J].Chemical Engineering Journal,2006,115:173-193.
[4]PATWARDHAN AW,JOSHI JB.Relation between Flow Pattern and Blending in Stirred Tanks[J].Industrial&Engineering Chemistry Research,1999,38:3131-3143.
[5]KOH PTL,SCHWARZ MP.CFD models of microcel and Jameson flotation cells[C].Seventh International Conference on CFD in the Minerals and Process Industries,1-6,CSIRO,Melbourne,Australia,2009.
[6]KOH PTL,SCHWARZ MP.CFD modelling of bubbleparticle attachments in flotation cells[J].Minerals Engineering,2003,24:476-488.
[7]KOH PTL,MANICKAM M,SCHWARZ MP.CDFsimulation of bubble-particle collisions in mineral flotation cells[J].Minerals Engineering,2005,24:376-385.
[8]KOH PTL,SCHWARZ MP.CFD modelling of bubbleparticle attachments in flotation cells[J].Minerals Engineering,2006,19:619-26.
[9]KOH PTL,SCHWARZ MP.Modelling attachment rates of multi-sized bubbles with particles in a flotation cell[J].International Journal of Mineral Processing,2008,89:46-58.
[10]宋涛,蒋开喜,周俊武,等.气升式环流反应器内气泡分布的数值模拟[J].矿冶,2015,24(1):61-66.
[11]DESHMUKH NA,PATIL SS,JOSHI JB.Gas Induction Characteristics of Hollow Self-Inducing Impeller[J].Chemical Engineering Research and Design,2006,84:124-132.
[12]ACHOURI R,DHAOUADI H,MHIRI H,BOURNOT P.Numerical and experimental investigation of the selfinducing turbine aeration capacity[J].Energy Conversion and Management,2014,83:188-196.
[13]ACHOURI R,HAMZA SB,DHAOUADI H,et al.Volumetric mass transfer coefficient and hydrodynamic study of a new self-inducing turbine[J].Energy Conversion and Management 2013,71:69-75.
[14]ACHOURI R,MOKNI I,MHIRI H.A 3D CFD simulation of a self inducing Pitched Blade Turbine Downflow[J].Energy Conversion and Management,2012,64:633-641.
[15]FONTE CP,PINHO BS,MOREAU VS,et al.Prediction of the Induced Gas Flow Rate from a Self-Inducing Impeller[J].Chemical Engineering&Technology,2014,37:571-579.
[16]HASSAN FAYED,SAAD RAGAB.CFD Analysis of TwoPhase Flow in WEMCO-300m3Supercell[C].SME/CMAAnnual Meeting&Exhibit February,2013.
[2]刘文婷.新型浮选机数值模拟研究[D].天津:河北工业大学,2011.
[3]KUMARESAN T,JOSHI JB.Effect of impeller design on the flow pattern and mixing in stirred tanks[J].Chemical Engineering Journal,2006,115:173-193.
[4]PATWARDHAN AW,JOSHI JB.Relation between Flow Pattern and Blending in Stirred Tanks[J].Industrial&Engineering Chemistry Research,1999,38:3131-3143.
[5]KOH PTL,SCHWARZ MP.CFD models of microcel and Jameson flotation cells[C].Seventh International Conference on CFD in the Minerals and Process Industries,1-6,CSIRO,Melbourne,Australia,2009.
[6]KOH PTL,SCHWARZ MP.CFD modelling of bubbleparticle attachments in flotation cells[J].Minerals Engineering,2003,24:476-488.
[7]KOH PTL,MANICKAM M,SCHWARZ MP.CDFsimulation of bubble-particle collisions in mineral flotation cells[J].Minerals Engineering,2005,24:376-385.
[8]KOH PTL,SCHWARZ MP.CFD modelling of bubbleparticle attachments in flotation cells[J].Minerals Engineering,2006,19:619-26.
[9]KOH PTL,SCHWARZ MP.Modelling attachment rates of multi-sized bubbles with particles in a flotation cell[J].International Journal of Mineral Processing,2008,89:46-58.
[10]宋涛,蒋开喜,周俊武,等.气升式环流反应器内气泡分布的数值模拟[J].矿冶,2015,24(1):61-66.
[11]DESHMUKH NA,PATIL SS,JOSHI JB.Gas Induction Characteristics of Hollow Self-Inducing Impeller[J].Chemical Engineering Research and Design,2006,84:124-132.
[12]ACHOURI R,DHAOUADI H,MHIRI H,BOURNOT P.Numerical and experimental investigation of the selfinducing turbine aeration capacity[J].Energy Conversion and Management,2014,83:188-196.
[13]ACHOURI R,HAMZA SB,DHAOUADI H,et al.Volumetric mass transfer coefficient and hydrodynamic study of a new self-inducing turbine[J].Energy Conversion and Management 2013,71:69-75.
[14]ACHOURI R,MOKNI I,MHIRI H.A 3D CFD simulation of a self inducing Pitched Blade Turbine Downflow[J].Energy Conversion and Management,2012,64:633-641.
[15]FONTE CP,PINHO BS,MOREAU VS,et al.Prediction of the Induced Gas Flow Rate from a Self-Inducing Impeller[J].Chemical Engineering&Technology,2014,37:571-579.
[16]HASSAN FAYED,SAAD RAGAB.CFD Analysis of TwoPhase Flow in WEMCO-300m3Supercell[C].SME/CMAAnnual Meeting&Exhibit February,2013.