By means of structure and process decomposition

this work is devoted to elucidating mass transfer process in heterogeneous flow theoretically.Mass transfer process in heterogeneous flow of gas-solid circulating fluidized bed is considered to consist of two subprocesses: static and dynamic.At the mean time

the static subprocess is decomposed to three scales: mass transfer in dilute phase; dense phase; and inter phase.Then

by virtue of EMMS model

local hydrodynamics of heterogeneous two-phase parameters are calculated from the condition of operation parameters (solids mass flux

gas velocity) and species characteristics.Mass transfer coefficient is obtained by slip velocity

voidage

ect.Based on above

axial distribution of concentration is studied.At last

effective mass transfer coefficient of circulating fluidized bed is discussed.