AXIAL GAS MIXING IN A HIGH DENSITY DOWNER REACTOR

摘要：

　　The hydrodynamic behavior and the axial gas mixing in a high density downer reactor was studied by mean of CFD simulation.Two-fluid model based on a kinetic theory of granular flow was adopted to simulate flow behavior in the system.The high density downer was operated with solids circulation rate (Gs) in the range of 300-600 kg/m2s leading to solids fraction higher than 10%.The simulation results show that the flow structure in this high density downer is a core-annulus pattern, which is more uniform solids fraction in the center and high density peak near the wall region.The axial Peclet number increases with solids circulation rate.At low superficial gas velocity (Ug), the axial Peclet number decreases with increasing of Ug, but the reverse trend is observed at higher Ug.In addition, the effects of physical properties of solids particle on the gas mixing were also studied.Larger or heavier particles tend to decrease the axial gas Peclet number.Moreover, the correlations based on the operating conditions and the physical properties of gas and particle to predict axial Peglet number of gas in such high density downer reactor were proposed.

关键词： Axial gas mixing High density downer CFD simulation Dispersion model Two fluid model

作者: Parinya Khongprom Sunun Limtrakul Terdthai Vatanatham

作者单位: Department of Industrial Chemistry,Faculty of Applied Science,King Mongkuts University of Technolog Department of Chemical Engineering,Faculty of Engineer,Kasetsart University,Bangkok 10900,Thailand

会议类型: 国际会议

会议名称: The 11th International Conference on Fluidized Bed Technology(CFB-11)(第十一届流化床技术国际会议)

会议地点: 北京

会议语种:英文

页码: 67-72

在线出版日期: 2014-05-14（万方平台首次上网日期，不代表论文的发表时间）