A modified energy-minimization multi-scale (EMMS) model is proposed th rough establishing different corresponding expressions for calculating radial pr ofiles of gas velocity in core and annulus.The calculating results of the modifi ed model are more reasonable than the previous model compared with the experimental results.A new model

called energy-minimization multi-scale core-annulus (EMMS/CA) model

is developed by combination of the EMMS and CA model s.The equation of CA model can be solved via the solution of EMMS model.Two-dime nsional distributions of dynamic parameters in gas-solid circulating fluidized b ed

including voidage

fluid velocity

particle velocity

slip velocity and so on

can be calculated with the use of the present model.Comparisons with experime ntal data from literature confirmed the validity of the model.