CIESC Journal ›› 2012, Vol. 63 ›› Issue (5): 1398-1404.DOI: 10.3969/j.issn.0438-1157.2012.05.011

Previous Articles     Next Articles

Effect of boundary condition and system structure on gas-solids flow characteristics in riser

ZHOU Xinyu,GAO Jinsen,XU Chunming,LAN Xingying   

  1. State Key Laboratory of Heavy Oil Processing,China University of Petroleum
  • Received:2011-11-22 Revised:2012-02-13 Online:2012-05-05 Published:2012-05-05

边界条件和结构尺寸对提升管内气固流动特性的影响

周新宇,高金森,徐春明,蓝兴英   

  1. 中国石油大学(北京)重质油国家重点实验室
  • 通讯作者: 蓝兴英

Abstract: A drag model based on energy minimization multi-scale (EMMS)approach was used in the numerical simulation for fast fluidized bed (FFB)containing Geldart A particles.The Johnson and Jackson boundary conditions (BCs)were used for solids phase.The experimental conditions of Li and Kwauk were adopted in the simulation and two inlet BCs were used to evaluate its impact on the predicted gas-solids two-phase flow characteristics in term of axial voidage profile,outlet solids flux and solids holdup.Axial voidage profile was also investigated with different bed diameters and outlet constraints.It was found that it needed less simulation time,and could diminish the cost of simulation for cycle inlet BC than velocity inlet BC.Increasing bed diameter could result in weakened wall influence,and decrease in bed density and heterogeneity of axial profile.The enhancement of outlet constraint could lead to an increase in bed density.

Key words: fast fluidized bed, two-phase flows, boundary condition, bed diameter, energy minimization multi-scale

关键词: 快速流化床, 两相流, 边界条件, 床层直径, 能量最小多尺度