CIESC Journal

• RESEARCH PAPERS • 上一篇    下一篇

循环硫化床上升管中动态行为的拟流体模拟

王维; 李佑楚   

  1. Institute of Process Engineering formerly Institute of Chemical Metallurgy, Chinese Academy
    of Sciences, Beijing 100080, China 
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2002-02-28 发布日期:2002-02-28
  • 通讯作者: 王维

Pseudo-Fluid Simulation of Transient Behaviors in a CFB Riser

WANGWei; LI Youchu   

  1. Institute of Process Engineering formerly Institute of Chemical Metallurgy, Chinese Academy
    of Sciences, Beijing 100080, China 
  • Received:1900-01-01 Revised:1900-01-01 Online:2002-02-28 Published:2002-02-28
  • Contact: WANGWei

摘要: The kinetic theory of granular flow (KTGF) is modified to fit the Einstein’s equation for
effective viscosity of dilute flow. A pseudo-fluid approach based on this modified KTGF is
used to simulate the dynamic formation and dissipation of clusters in a circulating
fluidized bed riser. The agglomeration of particles reduces slip velocity within particle
clusters, and hence results in two reverse trends: discrete particles are lifted by air
while particle clusters fall down along the wall. The dynamic equilibrium of these two
types of motion leads to the characteristic sigmoid profile of solid concentration along
the longitudinal direction. The predicted solid velocity,lateral and longitudinal profiles
of solid volume fraction and annulus thickness are in reasonable agreement with
experimental results.

关键词: Eulerian simulation;gas-solid;kinetic theory;cluster;circulating fluidized bed

Abstract: The kinetic theory of granular flow (KTGF) is modified to fit the Einstein’s equation for
effective viscosity of dilute flow. A pseudo-fluid approach based on this modified KTGF is
used to simulate the dynamic formation and dissipation of clusters in a circulating
fluidized bed riser. The agglomeration of particles reduces slip velocity within particle
clusters, and hence results in two reverse trends: discrete particles are lifted by air
while particle clusters fall down along the wall. The dynamic equilibrium of these two
types of motion leads to the characteristic sigmoid profile of solid concentration along
the longitudinal direction. The predicted solid velocity,lateral and longitudinal profiles
of solid volume fraction and annulus thickness are in reasonable agreement with
experimental results.

Key words: Eulerian simulation, gas-solid, kinetic theory, cluster, circulating fluidized bed