不同液固动量交换系数模型对颗粒流化行为数值模拟的适应性
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摘要
基于Euler-Euler法,采用包括Syamlal-O’Brien模型、Wen-Yu模型、Gidaspow模型、Gibilaro模型和Huilin-Gidaspow模型在内5个液固动量交换系数模型模拟粒径为0.25～0.35mm石英砂颗粒流化过程。结合颗粒流化试验结果,对比不同液固动量交换系数模型预测的床层高度准确度。研究结果表明:Huilin-Gidaspow和Gidaspow模型准确度最高,其均方根误差都为5.01,Syamlal-O’Brien模型准确度最低,其均方根误差为47.14。Huilin-Gidaspow模型预测的颗粒相流态存在由中心向上,再由四周下降的循环流,与实际情况相符,而Gidaspow模型模拟结果不存在颗粒相循环流。
Fluidization behavior of 0.25-0.35 mm quartz particles in water was simulated through Euler-Euler approach with various momentum exchange coefficient models, including Syamlal-O'Brien model, Wen-Yu model, Gidaspow model, Gibilaro model and Huilin-Gidaspow model. The bed heights predicted by using these momentum exchange coefficient models were compared with experimental values. The results show that the most accurate model is proved to be Huilin-Gidaspow model and Gidaspow model, with the same root-mean-square error(RMSE) of 5.01, while the RMSE of Syamlal-O'Brien model is 47.14, indicating the worst performance among these models. Circulating flow of particles phase was depicted from the simulation results of Huilin-Gidaspow model, which can be observed during fluidization experiments. However, particles circulating flow does not exist in the simulation results of Gidaspow model.
Fluidization behavior of 0.25-0.35 mm quartz particles in water was simulated through Euler-Euler approach with various momentum exchange coefficient models, including Syamlal-O'Brien model, Wen-Yu model, Gidaspow model, Gibilaro model and Huilin-Gidaspow model. The bed heights predicted by using these momentum exchange coefficient models were compared with experimental values. The results show that the most accurate model is proved to be Huilin-Gidaspow model and Gidaspow model, with the same root-mean-square error(RMSE) of 5.01, while the RMSE of Syamlal-O'Brien model is 47.14, indicating the worst performance among these models. Circulating flow of particles phase was depicted from the simulation results of Huilin-Gidaspow model, which can be observed during fluidization experiments. However, particles circulating flow does not exist in the simulation results of Gidaspow model.
引文
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[17]GIBILARO L G,FELICE R D,WALDRAM S P,et al.Generalized friction factor and drag coefficient correlations for fluid-particle interactions[J].Chemical Engineering Science,1985,40(10):1817-1823.
[18]HUILIN L,GIDASPOW D.Hydrodynamics of binary fluidization in a riser:CFD simulation using two granular temperatures[J].Chemical Engineering Science,2003,58(16):3777-3792.
[19]DALLA VALLE J M.Micromeritics[J].Soil Science,1948,56(2):50-55.
[2]骆振福,陈清如.流态化矿物分选技术的研究进展[J].矿山机械,1999(7):37-39.LUO Zhenfu,CHEN Qingru.Development of fluidization technology in mineral processing[J].Mining&Processing Equeapment,1999(7):37-39.
[3]高晓根,刘文东,魏耀东,等.液固流化床内床层动态特性的CFD模拟[J].燃料化学学报,2006,34(4):492-498.GAO Xiaogen,LIU Wendong,WEI Yaodong,et al.CFDsimulation for the kinematic characteristics of liquid-solid flow in fluidized beds[J].Journal of Fuel Chemistry and Technology,2006,34(4):492-498.
[4]DONG Kejun,GUO Baoyu,CHU Kaiwei,et al.Simulation of liquid-solid flow in a coal distributor[J].Minerals Engineering,2008,21(11):789-796.
[5]胡新辉,朱家骅,夏素兰,等.液固流化床中颗粒循环运动机理的初步研究[J].化学反应工程与工艺,1998(1):97-100.HU Xinhui,ZHU Jiaye,XIA Sulan,et al.On the mechanism of particles’circulating movement in liquid-solid fluidized beds[J].Chemical Reaction Engineering and Technology,1998(1):97-100.
[6]DOROODCHI E,GALVIN K P,FLETCHER D F.The influence of inclined plates on expansion behaviour of solid suspensions in a liquid fluidised bed:a computational fluid dynamics study[J].Powder Technology,2005,160(1):20-26.
[7]张锴,裴培,STEFANO B.一个基于双流体理论预测三维流化床内流动特性的数学模型(Ⅱ)液固体系流体动力学特性[J].化工学报,2008,59(5):1100-1106.ZHANG Kai,PEI Pei,STEFANO B.A model on two-fluid theory for predicting hydrodynamics behavior in 3D fluidized beds(Ⅱ)Fluid dynamics of liquid-solid system[J].Journal of Chemical Industry and Engineering(China),2008,59(5):1100-1106.
[8]张锴,STEFANO B.流化床内颗粒流体两相流的CFD模拟[J].化工学报,2010,61(9):2192-2207.ZHANG Kai,STEFANO B.CFD simulation of particle-fluid two-phase flow in fluidized beds[J].Journal of Chemical Industry and Engineering(China),2010,61(9):2192-2207.
[9]沈志恒,刘文铁,金记英,等.倒置液固流化床内液固两相流动特性的数值模拟[J].过程工程学报,2006,6(s2):394-397.SHEN Zhiheng,LIU Wentie,JIN Jiying,et al.Numerical simulation of flow behavior of solid and liquid phases in inverse fluidized bed[J].The Chinese Journal of Process Engineering,2006,6(s2):394-397.
[10]张卫义,陈罕,方陈靖.液-固流态化最小流态化速度计算方法改进[J].石油化工设备,2011,40(1):5-9.ZHANG Weiyi,CHEN Han,FANG Chenjing.Improved calculation equation of the minimum fluidization velocity for solid-liquid fluidization system[J].Petro-Chemical Equipment,2011,40(1):5-9.
[11]韦鲁滨,孙铭阳,孟丽诚,等.基于CFD的液固分选流化床数值模拟[J].煤炭学报,2016,41(7):1820-1826.WEI Lubin,SUN Mingyang,MENG Licheng,et al.Numerical studies of liquid-solid fluidized bed separator using CFD[J].Journal of China Coal Society,2016,41(7):1820-1826.
[12]WEI Lubin,SUN Mingyang.Numerical studies of the influence of particles'size distribution characteristics on the gravity separation performance of liquid-solid fuidized bed separator[J].International Journal of Mineral Processing,2016,157:111-119.
[13]孙铭阳,韦鲁滨,朱学帅,等.液固分选流化床三相流场模拟中各粘性流动模型的适用性[J].过程工程学报,2016,16(1):10-17.SUN Mingyang,WEI Lubin,ZHU Xueshuai,et al.Research on performances of different viscous models in simulation of flow field in liquid-solid fluidized bed separator[J].The Chinese Journal of Process Engineering,2016,16(1):86-93.
[14]SYAMLAL M,O'BRIEN T J.Computer simulation of bubbles in a fluidized bed[J].AIChE Symposium Series,1989,85:22-31.
[15]WEN C Y,YU Y H.Mechanics of fluidization[J].Chem Eng Prog Symp Ser,1966,62:100-111.
[16]GIDASPOW D,BEZBURUAH R,DING J.Hydrodynamics of circulating fluidized beds:kinetic theory approach[C]//7th International Conference on Fluidization.Gold Coast,Australia,1992:1-8.
[17]GIBILARO L G,FELICE R D,WALDRAM S P,et al.Generalized friction factor and drag coefficient correlations for fluid-particle interactions[J].Chemical Engineering Science,1985,40(10):1817-1823.
[18]HUILIN L,GIDASPOW D.Hydrodynamics of binary fluidization in a riser:CFD simulation using two granular temperatures[J].Chemical Engineering Science,2003,58(16):3777-3792.
[19]DALLA VALLE J M.Micromeritics[J].Soil Science,1948,56(2):50-55.