Steady-state simulation of core-annulus flow in a circulating fluidized bed (CFB) riser

TY - JOUR

T1 - Steady-state simulation of core-annulus flow in a circulating fluidized bed (CFB) riser

AU - Gao, Xi

AU - Wang, Li Jun

AU - Wu, Cheng

AU - Cheng, You Wei

AU - Li, Xi

N1 - Funding Information: This work was supported by Dalian Institute of Chemical Physics, Chinese Academy of Science, and partially supported by Natural Science Foundation of China (Nos.U1162125, 20906077) and National 863 Plan Project (No.2011AA05A205).

PY - 2012/8/20

Y1 - 2012/8/20

N2 - A steady-state multiphase CFD model is proposed for the simulation of core-annulus flow in a circulating fluidized bed (CFB) riser. A CFD model based on Eulerian-Eulerian approach is developed, which incorporates two mechanisms that result in the lateral profiles of solids: mixing of individual particles based on a kinetic theory treatment and mixing of clusters based on a modified k-ε turbulence model. The steady-state model can simulate the core-annulus flow more efficiently, which can eliminate the unrealistic sensitivity and need less computational resources comparing with other transient models. This model shows more potential for the simulation of commercial fluidized equipments. The sensitivity of the model predictions involving four parameters indicates that ew and φ have weak influence on the correctly prediction of core-annulus flow, while the model remains a certain of sensitivity to e s and C s. The results predicted by the model show good agreement with experimental data under different operating conditions reported by Tartan and Gidaspow (2004).

AB - A steady-state multiphase CFD model is proposed for the simulation of core-annulus flow in a circulating fluidized bed (CFB) riser. A CFD model based on Eulerian-Eulerian approach is developed, which incorporates two mechanisms that result in the lateral profiles of solids: mixing of individual particles based on a kinetic theory treatment and mixing of clusters based on a modified k-ε turbulence model. The steady-state model can simulate the core-annulus flow more efficiently, which can eliminate the unrealistic sensitivity and need less computational resources comparing with other transient models. This model shows more potential for the simulation of commercial fluidized equipments. The sensitivity of the model predictions involving four parameters indicates that ew and φ have weak influence on the correctly prediction of core-annulus flow, while the model remains a certain of sensitivity to e s and C s. The results predicted by the model show good agreement with experimental data under different operating conditions reported by Tartan and Gidaspow (2004).

KW - Fluidization

KW - Hydrodynamics

KW - Multiphase flow

KW - Particle

KW - Steady-state

KW - Turbulence

UR - http://www.scopus.com/inward/record.url?scp=84861859867&partnerID=8YFLogxK

U2 - 10.1016/j.ces.2012.03.030

DO - 10.1016/j.ces.2012.03.030

M3 - 文章

AN - SCOPUS:84861859867

SN - 0009-2509

VL - 78

SP - 98

EP - 110

JO - Chemical Engineering Science

JF - Chemical Engineering Science

ER -